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diff --git a/doc/src/widgets-and-layouts/stylesheet.qdoc b/doc/src/widgets-and-layouts/stylesheet.qdoc new file mode 100644 index 0000000..354050d --- /dev/null +++ b/doc/src/widgets-and-layouts/stylesheet.qdoc @@ -0,0 +1,3978 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +/*! + \page stylesheet.html + \title Qt Style Sheets + \brief How to use style sheets to customize the appearance of widgets. + + \ingroup frameworks-technologies + + \previouspage {Implementing Styles and Style Aware Widgets}{Styles} + \contentspage Widgets and Layouts + \nextpage The Style Sheet Syntax + + \keyword style sheet + \keyword stylesheet + + Qt Style Sheets are a powerful mechanism that allows you to + customize the appearance of widgets, in addition to what is + already possible by subclassing QStyle. The concepts, + terminology, and syntax of Qt Style Sheets are heavily inspired + by HTML \l{http://www.w3.org/Style/CSS/}{Cascading Style Sheets + (CSS)} but adapted to the world of widgets. + + Topics: + + \list + \i \l{Overview} + \i \l{The Style Sheet Syntax} + \i \l{Qt Designer Integration} + \i \l{Customizing Qt Widgets Using Style Sheets} + \i \l{Qt Style Sheets Reference} + \i \l{Qt Style Sheets Examples} + \endlist + + \target overview + \section1 Overview + + Styles sheets are textual specifications that can be set on the + whole application using QApplication::setStyleSheet() or on a + specific widget (and its children) using + QWidget::setStyleSheet(). If several style sheets are set at + different levels, Qt derives the effective style sheet from all + of those that are set. This is called cascading. + + For example, the following style sheet specifies that all + \l{QLineEdit}s should use yellow as their background color, and + all \l{QCheckBox}es should use red as the text color: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 0 + + For this kind of customization, style sheets are much more + powerful than QPalette. For example, it might be tempting to set + the QPalette::Button role to red for a QPushButton to obtain a + red push button. However, this wasn't guaranteed to work for all + styles, because style authors are restricted by the different + platforms' guidelines and (on Windows XP and Mac OS X) by the + native theme engine. + + Style sheets let you perform all kinds of customizations that are + difficult or impossible to perform using QPalette alone. If you + want yellow backgrounds for mandatory fields, red text for + potentially destructive push buttons, or fancy check boxes, style + sheets are the answer. + + Style sheets are applied on top of the current \l{QStyle}{widget + style}, meaning that your applications will look as native as + possible, but any style sheet constraints will be taken into + consideration. Unlike palette fiddling, style sheets offer + guarantees: If you set the background color of a QPushButton to be + red, you can be assured that the button will have a red background + in all styles, on all platforms. In addition, \l{Qt Designer} + provides style sheet integration, making it easy to view the effects + of a style sheet in different \l{QStyle}{widget styles}. + + In addition, style sheets can be used to provide a distinctive + look and feel for your application, without having to subclass + QStyle. For example, you can specify arbitrary images for radio + buttons and check boxes to make them stand out. Using this + technique, you can also achieve minor customizations that would + normally require subclassing several style classes, such as + specifying a \l{QStyle::styleHint()}{style hint}. The + \l{widgets/stylesheet}{Style Sheet} example depicted below defines + two distinctive style sheets that you can try out and modify at + will. + + \table + \row \o \inlineimage stylesheet-coffee-xp.png + \o \inlineimage stylesheet-pagefold.png + \row \o Coffee theme running on Windows XP + \o Pagefold theme running on Windows XP + \endtable + + \table + \row \o \inlineimage stylesheet-coffee-cleanlooks.png + \o \inlineimage stylesheet-pagefold-mac.png + \row \o Coffee theme running on Ubuntu Linux + \o Pagefold theme running on Mac OS X + \endtable + + When a style sheet is active, the QStyle returned by QWidget::style() + is a wrapper "style sheet" style, \e not the platform-specific style. The + wrapper style ensures that any active style sheet is respected and + otherwise forwards the drawing operations to the underlying, + platform-specific style (e.g., QWindowsXPStyle on Windows XP). + + Since Qt 4.5, Qt style sheets fully supports Mac OS X. + + \warning Qt style sheets are currently not supported for custom QStyle + subclasses. We plan to address this in some future release. +*/ + +/*! + \page stylesheet-syntax.html + \contentspage {Qt Style Sheet}{Contents} + \previouspage Qt Style Sheet + \nextpage Qt Designer Integration + \title The Style Sheet Syntax + + Qt Style Sheet terminology and syntactic rules are almost + identical to those of HTML CSS. If you already know CSS, you can + probably skim quickly through this section. + + \tableofcontents + + \section1 Style Rules + + Style sheets consist of a sequence of style rules. A \e{style + rule} is made up of a selector and a declaration. The + \e{selector} specifies which widgets are affected by the rule; + the \e{declaration} specifies which properties should be set on + the widget. For example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 1 + + In the above style rule, \c QPushButton is the selector and \c{{ + color: red }} is the declaration. The rule specifies that + QPushButton and its subclasses (e.g., \c MyPushButton) should use + red as their foreground color. + + Qt Style Sheet is generally case insensitive (i.e., \c color, + \c Color, \c COLOR, and \c cOloR refer to the same property). + The only exceptions are class names, + \l{QObject::setObjectName()}{object names}, and Qt property + names, which are case sensitive. + + Several selectors can be specified for the same declaration, + using commas (\c{,}) to separate the selectors. For example, + the rule + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 2 + + is equivalent to this sequence of three rules: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 3 + + The declaration part of a style rule is a list of + \tt{\e{property}: \e{value}} pairs, enclosed in braces (\c{{}}) + and separated with semicolons. For example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 4 + + See the \l{List of Properties} section below for the list of + properties provided by Qt widgets. + + \section1 Selector Types + + All the examples so far used the simplest type of selector, the + Type Selector. Qt Style Sheets support all the + \l{http://www.w3.org/TR/REC-CSS2/selector.html#q1}{selectors + defined in CSS2}. The table below summarizes the most useful + types of selectors. + + \table 100% + \header + \o Selector + \o Example + \o Explanation + + \row + \o Universal Selector + \o \c * + \o Matches all widgets. + + \row + \o Type Selector + \o \c QPushButton + \o Matches instances of QPushButton and of its subclasses. + + \row + \o Property Selector + \o \c{QPushButton[flat="false"]} + \o Matches instances of QPushButton that are not + \l{QPushButton::}{flat}. You may use this selector to test + for any Qt property specified using Q_PROPERTY(). In + addition, the special \c class property is supported, for + the name of the class. + + This selector may also be used to test dynamic properties. + For more information on customization using dynamic properties, + refer to \l{Customizing Using Dynamic Properties}. + + Instead of \c =, you can also use \c ~= to test whether a + Qt property of type QStringList contains a given QString. + + \warning If the value of the Qt property changes after the + style sheet has been set, it might be necessary to force a + style sheet recomputation. One way to achieve this is to + unset the style sheet and set it again. + + \row + \o Class Selector + \o \c .QPushButton + \o Matches instances of QPushButton, but not of its subclasses. + + This is equivalent to \c{*[class~="QPushButton"]}. + + \row + \o ID \target ID Selector + Selector + \o \c{QPushButton#okButton} + \o Matches all QPushButton instances whose + \l{QObject::objectName}{object name} is \c okButton. + + \row + \o Descendant Selector + \o \c{QDialog QPushButton} + \o Matches all instances of QPushButton that are descendants + (children, grandchildren, etc.) of a QDialog. + + \row + \o Child Selector + \o \c{QDialog > QPushButton} + \o Matches all instances of QPushButton that are direct + children of a QDialog. + \endtable + + \section1 Sub-Controls + + For styling complex widgets, it is necessary to access subcontrols of the + widget, such as the drop-down button of a QComboBox or the up and down + arrows of a QSpinBox. Selectors may contain \e{subcontrols} that make it + possible to restrict the application of a rule to specific widget + subcontrols. For example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 5 + + The above rule styles the drop-down button of all \l{QComboBox}es. + Although the double-colon (\c{::}) syntax is reminiscent of CSS3 + Pseudo-Elements, Qt Sub-Controls differ conceptually from these and have + different cascading semantics. + + Sub-controls are always positioned with respect to another element - a + reference element. This reference element could be the widget or another + Sub-control. For example, the \l{Qt Style Sheets Reference#drop-down-sub} + {::drop-down} of a QComboBox is placed, by default, in the top right corner + of the Padding rectangle of the QComboBox. The + \l{Qt Style Sheets Reference#drop-down-sub}{::drop-down} is placed, + by default, in the Center of the Contents rectangle of the + \l{Qt Style Sheets Reference#drop-down-sub}{::drop-down} Sub-control. See + the \l{List of Stylable Widgets} below for the Sub-controls to use to + style a widget and their default positions. + + The origin rectangle to be used can be changed using the + \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin} + property. For example, if we want to place the drop-down in the margin + rectangle of the QComboBox instead of the default Padding rectangle, we + can specify: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 6 + + The alignment of the drop-down within the Margin rectangle is changed + using \l{Qt Style Sheets Reference#subcontrol-position-prop} + {subcontrol-position} property. + + The \l{Qt Style Sheets Reference#width-prop}{width} and + \l{Qt Style Sheets Reference#height-prop}{height} properties can be used + to control the size of the Sub-control. Note that setting a + \l{Qt Style Sheets Reference#image-prop}{image} implicitly sets the size + of a Sub-control. + + The relative positioning scheme + (\l{Qt Style Sheets Reference#position-prop}{position} : relative), + allows the position of the Sub-Control to be offset from its initial + position. For example, when the QComboBox's drop-down button is + pressed, we might like the arrow inside to be offset to give a + "pressed" effect. To achieve this, we can specify: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 7 + + The absolute positioning scheme + (\l{Qt Style Sheets Reference#position-prop}{position} : absolute), + allows the position and size of the Sub-control to be changed with + respect to the reference element. + + Once positioned, they are treated the same as widgets and can be styled + using the \l{box model}. + + See the \l{List of Sub-Controls} below for a list of supported + sub-controls, and \l{Customizing the QPushButton's Menu Indicator + Sub-Control} for a realistic example. + + \note With complex widgets such as QComboBox and QScrollBar, if one + property or sub-control is customized, \bold{all} the other properties or + sub-controls must be customized as well. + + \section1 Pseudo-States + + Selectors may contain \e{pseudo-states} that denote that restrict + the application of the rule based on the widget's state. + Pseudo-states appear at the end of the selector, with a colon + (\c{:}) in between. For example, the following rule applies when + the mouse hovers over a QPushButton: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 8 + + Pseudo-states can be negated using the exclamation operator. For + example, the following rule applies when the mouse does not hover + over a QRadioButton: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 9 + + Pseudo-states can be chained, in which case a logical AND is + implied. For example, the following rule applies to when the + mouse hovers over a checked QCheckBox: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 10 + + Negated Pseudo-states may appear in Pseudo-state chains. For example, + the following rule applies when the mouse hovers over a QPushButton + that is not pressed: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 11 + + If needed, logical OR can be expressed using the comma operator: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 12 + + Pseudo-states can appear in combination with subcontrols. For + example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 13 + + See the \l{List of Pseudo-States} section below for the list of + pseudo-states provided by Qt widgets. + + \section1 Conflict Resolution + + Conflicts arise when several style rules specify the same + properties with different values. Consider the following style + sheet: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 14 + + Both rules match QPushButton instances called \c okButton and + there is a conflict for the \c color property. To resolve this + conflict, we must take into account the \e specificity of the + selectors. In the above example, \c{QPushButton#okButton} is + considered more specific than \c QPushButton, because it + (usually) refers to a single object, not to all instances of a + class. + + Similarly, selectors with pseudo-states are more specific than + ones that do not specify pseudo-states. Thus, the following style + sheet specifies that a \l{QPushButton} should have white text + when the mouse is hovering over it, otherwise red text: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 15 + + Here's a tricky one: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 16 + + Here, both selectors have the same specificity, so if the mouse + hovers over the button while it is enabled, the second rule takes + precedence. If we want the text to be white in that case, we can + reorder the rules like this: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 17 + + Alternatively, we can make the first rule more specific: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 18 + + A similar issue arises in conjunction with Type Selectors. + Consider the following example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 19 + + Both rules apply to QPushButton instances (since QPushButton + inherits QAbstractButton) and there is a conflict for the + \l{Qt Style Sheets Reference#color-prop}{color} property. Because QPushButton + inherits QAbstractButton, it might be tempting to assume that + \c QPushButton is more specific than \c QAbstractButton. However, + for style sheet computations, all Type Selectors have the same + specificity, and the rule that appears last takes precedence. In + other words, \l{Qt Style Sheets Reference#color-prop}{color} is set to \c gray + for all \l{QAbstractButton}s, including \l{QPushButton}s. If we really + want \l{QPushButton}s to have red text, we can always reorder the + rules. + + For determining the specificity of a rule, Qt Style Sheets follow + the + \l{http://www.w3.org/TR/REC-CSS2/cascade.html#specificity}{CSS2 + Specification}: + + \quotation + \e{A selector's specificity is calculated as follows:} + + \list + \o \e{count the number of ID attributes in the selector (= a)} + \o \e{count the number of other attributes and pseudo-classes in the selector (= b)} + \o \e{count the number of element names in the selector (= c)} + \o \e{ignore pseudo-elements [i.e., \l{subcontrols}].} + \endlist + + \e{Concatenating the three numbers a-b-c (in a number system with a + large base) gives the specificity.} + + \e{Some examples:} + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 20 + \endquotation + + \section1 Cascading + + Style sheets can be set on the QApplication, on parent widgets, + and on child widgets. An arbitrary widget's effective style sheet + is obtained by merging the style sheets set on the widget's + ancestors (parent, grandparent, etc.), as well as any style sheet + set on the QApplication. + + When conflicts arise, the widget's own style sheet is always + preferred to any inherited style sheet, irrespective of the + specificity of the conflicting rules. Likewise, the parent + widget's style sheet is preferred to the grandparent's, etc. + + One consequence of this is that setting a style rule on a widget + automatically gives it precedence over other rules specified in + the ancestor widgets' style sheets or the QApplication style + sheet. Consider the following example. First, we set a style + sheet on the QApplication: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 21 + + Then we set a style sheet on a QPushButton object: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 22 + + The style sheet on the QPushButton forces the QPushButton (and + any child widget) to have blue text, in spite of the more + specific rule set provided by the application-wide style sheet. + + The result would have been the same if we had written + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 23 + + except that if the QPushButton had children (which is unlikely), + the style sheet would have no impact on them. + + Style sheet cascading is a complex topic. Refer to the + \l{http://www.w3.org/TR/CSS2/cascade.html#cascade}{CSS2 + Specification} for the gory details. Be aware that Qt currently + doesn't implement \c{!important}. + + \section1 Inheritance + + In classic CSS, when font and color of an item is not explicitly set, + it gets automatically inherited from the parent. When using Qt Style Sheets, + a widget does \bold{not} automatically inherit its font and color setting + from its parent widget. + + For example, consider a QPushButton inside a QGroupBox: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 24 + + The QPushButton does not have an explicit color set. Hence, instead + of inheriting color of its parent QGroupBox, it has the system color. + If we want to set the color on a QGroupBox and its children, + we can write: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 25 + + In contrast, setting a font and propagate using QWidget::setFont() and + QWidget::setPalette() propagates to child widgets. + + \section1 Widgets inside C++ namespaces + + The Type Selector can be used to style widgets of a particular type. For + example, + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 26 + + Qt Style Sheet uses QObject::className() of the widget to determine + when to apply the Type Selector. When custom widgets are inside namespaces, + the QObject::className() returns <namespace>::<classname>. This conflicts + with the syntax for \l{Sub-Controls}. To overcome this problem, + when using the Type Selector for widgets inside namespaces, we must + replace the "::" with "--". For example, + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 27 + + \section1 Setting QObject properties + + From 4.3 and above, any designable Q_PROPERTY + can be set using the qproperty-<property name> syntax. + + For example, + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 28 + + If the property references an enum declared with Q_ENUMS, you should + reference its constants by name, i.e., not their numeric value. + +*/ + +/*! + \page stylesheet-designer.html + \contentspage {Qt Style Sheet}{Contents} + \previouspage The Style Sheet Syntax + \nextpage Customizing Qt Widgets Using Style Sheets + \title Qt Designer Integration + + \l{Qt Designer}{Qt Designer} is an excellent tool + to preview style sheets. You can right-click on any widget in Designer + and select \gui{Change styleSheet...} to set the style sheet. + + \image designer-stylesheet-options.png + + In Qt 4.2 and later, \l{Qt Designer}{Qt Designer} also includes a + style sheet syntax highlighter and validator. The validator indicates + if the syntax is valid or invalid, at the bottom left of the \gui{Edit + Style Sheet} dialog. + + \image designer-validator-highlighter.png + + When you click \gui{OK} or \gui{Apply}, \QD will automatically display + the widget with its new stylesheet. + + \image designer-stylesheet-usage.png + */ + +/*! + \page stylesheet-customizing.html + \contentspage {Qt Style Sheet}{Contents} + \previouspage Qt Designer Integration + \nextpage Qt Style Sheets Reference + \title Customizing Qt Widgets Using Style Sheets + + When using style sheets, every widget is treated as a box with four + concentric rectangles: the margin rectangle, the border rectangle, the + padding rectangle, and the content rectangle. The box model describes + this in further detail. + + \tableofcontents + + \target box model + \section1 The Box Model + + The four concentric rectangles appear conceptually as below: + + \image stylesheet-boxmodel.png + + \list + \o The margin falls outside the border. + \o The border is drawn between the margin and the padding. + \o The padding falls inside the border, between the border and + the actual contents. + \o The content is what is left from the original widget or + subcontrol once we have removed the margin, the border, and + the padding. + \endlist + + The \l{Qt Style Sheets Reference#margin-prop}{margin}, + \l{Qt Style Sheets Reference#border-width-prop} + {border-width}, and + \l{Qt Style Sheets Reference#padding-prop}{padding} + properties all default to zero. In that case, all four rectangles + (\c margin, \c border, \c padding, and \c content) coincide exactly. + + You can specify a background for the widget using the + \l{Qt Style Sheets Reference#background-image-prop}{background-image} + property. By default, the background-image is drawn only for the area + inside the border. This can be changed using the + \l{Qt Style Sheets Reference#background-clip-prop}{background-clip} + property. You can use + \l{Qt Style Sheets Reference#background-repeat-prop}{background-repeat} + and + \l{Qt Style Sheets Reference#background-origin-prop}{background-origin} + to control the repetition and origin of the background image. + + A background-image does not scale with the size of the widget. To provide + a "skin" or background that scales along with the widget size, one must + use + \l{Qt Style Sheets Reference#border-image-prop}{border-image}. Since the + border-image property provides an alternate background, it is not required + to specify a background-image when border-image is specified. In the case, + when both of them are specified, the border-image draws over the + background-image. + + In addition, the \l{Qt Style Sheets Reference#image-prop}{image} property + may be used to draw an image over the border-image. The image specified does + not tile or stretch and when its size does not match the size of the widget, + its alignment is specified using the + \l{Qt Style Sheets Reference#image-position-prop}{image-position} + property. Unlike background-image and border-image, one may specify a + SVG in the image property, in which case the image is scaled automatically + according to the widget size. + + The steps to render a rule are as follows: + \list + \o Set clip for entire rendering operation (border-radius) + \o Draw the background (background-image) + \o Draw the border (border-image, border) + \o Draw overlay image (image) + \endlist + + \target sub controls + \section1 Sub-controls + + A widget is considered as a hierarchy (tree) of subcontrols drawn on top + of each other. For example, the QComboBox draws the drop-down sub-control + followed by the down-arrow sub-control. A QComboBox is thus rendered as + follows: + \list + \o Render the QComboBox { } rule + \o Render the QComboBox::drop-down { } rule + \o Render the QComboBox::down-arrow { } rule + \endlist + + Sub-controls share a parent-child relationship. In the case of QComboBox, + the parent of down-arrow is the drop-down and the parent of drop-down is + the widget itself. Sub-controls are positioned within their parent using + the \l{Qt Style Sheets Reference#subcontrol-position-prop} + {subcontrol-position} and + \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin} + properties. + + Once positioned, sub-controls can be styled using the \l{box model}. + + \note With complex widgets such as QComboBox and QScrollBar, if one + property or sub-control is customized, \bold{all} the other properties or + sub-controls must be customized as well. + +*/ + +/*! + \page stylesheet-reference.html + \contentspage {Qt Style Sheet}{Contents} + \previouspage Customizing Qt Widgets Using Style Sheets + \nextpage Qt Style Sheets Examples + \title Qt Style Sheets Reference + + Qt Style Sheets support various properties, pseudo-states, and + subcontrols that make it possible to customize the look of + widgets. + + \tableofcontents + + \section1 List of Stylable Widgets + + The following table lists the Qt widgets that can be customized + using style sheets: + + \table 100% + \header + \o Widget + \o How to Style + + \row + \o QAbstractScrollArea \target qabstractscrollarea-widget + \o Supports the \l{box model}. + + All derivatives of QAbstractScrollArea, including QTextEdit, + and QAbstractItemView (all item view classes), support + scrollable backgrounds using + \l{Qt Style Sheets Reference#background-attachment-prop} + {background-attachment}. Setting the background-attachment to + \c{fixed} provides a background-image that does not scroll with the + viewport. Setting the background-attachment to \c{scroll}, scrolls + the background-image when the scroll bars move. + + See \l{Qt Style Sheets Examples#Customizing QAbstractScrollArea} + {Customizing QAbstractScrollArea} for an example. + + \row + \o QCheckBox \target qcheckbox-widget + \o Supports the \l{box model}. The check indicator can be + styled using the \l{#indicator-sub}{::indicator} + subcontrol. By default, the indicator is placed in the Top + Left corner of the Contents rectangle of the widget. + + The \l{#spacing-prop}{spacing} property + specifies the spacing between the check indicator and + the text. + + See \l{Qt Style Sheets Examples#Customizing QCheckBox} + {Customizing QCheckBox} for an example. + + \row + \o QColumnView \target qcolumnview-widget + \o The grip can be styled be using the \l{image-prop}{image} property. + The arrow indicators can by styled using the + \l{left-arrow-sub}{::left-arrow} subcontrol and the + \l{right-arrow-sub}{::right-arrow} subcontrol. + + \row + \o QComboBox \target qcombobox-widget + \o The frame around the combobox can be styled using the + \l{box model}. The drop-down button can be styled using + the \l{#drop-down-sub}{::drop-down} subcontrol. By default, the + drop-down button is placed in the top right corner of the padding + rectangle of the widget. The arrow mark inside the drop-down button + can be styled using the \l{#down-arrow-sub}{::down-arrow} + subcontrol. By default, the arrow is placed in the center of the + contents rectangle of the drop-down subcontrol. + + See \l{Qt Style Sheets Examples#Customizing QComboBox}{Customizing QComboBox} + for an example. + + \row + \o QDateEdit \target qdateedit-widget + \o See \l{#qspinbox-widget}{QSpinBox}. + + \row + \o QDateTimeEdit \target qdatetimeedit-widget + \o See \l{#qspinbox-widget}{QSpinBox}. + + \row + \o QDialog \target qdialog-widget + \o Supports only the \l{Qt Style Sheets Reference#background-prop}{background}, + \l{#background-clip-prop}{background-clip} and + \l{#background-origin-prop}{background-origin} properties. + + \warning Make sure you define the Q_OBJECT macro for your custom + widget. + + \row + \o QDialogButtonBox \target qdialogbuttonbox-widget + \o The layout of buttons can be altered using the + \l{#button-layout-prop}{button-layout} property. + + \row + \o QDockWidget \target qdockwidget-widget + \o Supports styling of the title bar and the title bar buttons when docked. + + The dock widget border can be styled using the \l{#border-prop}{border} + property. The \l{#title-sub}{::title} subcontrol can be used to customize + the title bar. The close and float buttons are positioned with respect + to the \l{title-sub}{::title} subcontrol using the + \l{#close-button-sub}{::close-button} and + \l{#float-button-sub}{::float-button} respectively. + + When the title bar is vertical, the \l{#vertical-ps}{:vertical} pseudo + class is set. In addition, depending on QDockWidget::DockWidgetFeature, + the \l{#closable-ps}{:closable}, \l{#floatable-ps}{:floatable} and + \l{#movable-ps}{:movable} pseudo states are set. + + \note Use QMainWindow::separator to style the resize handle. + + \warning The style sheet has no effect when the QDockWidget is undocked + as Qt uses native top level windows when undocked. + + See \l{Qt Style Sheets Examples#Customizing QDockWidget} + {Customizing QDockWidget} for an example. + + \row + \o QDoubleSpinBox \target qdoublespinbox-widget + \o See \l{#qspinbox-widget}{QSpinBox}. + + \row + \o QFrame \target qframe-widget + \o Supports the \l{box model}. + + Since 4.3, setting a stylesheet on a QLabel automatically + sets the QFrame::frameStyle property to QFrame::StyledPanel. + + See \l{Qt Style Sheets Examples#Customizing QFrame}{Customizing QFrame} + for an example. + + \row + \o QGroupBox \target qgroupbox-widget + \o Supports the \l{box model}. The title can be styled using the + \l{#title-sub}{::title} subcontrol. By default, the title is placed + depending on QGroupBox::textAlignment. + + In the case of a checkable QGroupBox, the title includes the + check indicator. The indicator is styled using the + the \l{#indicator-sub}{::indicator} subcontrol. The + \l{#spacing-prop}{spacing} property can be used to control + the spacing between the text and indicator. + + See \l{Qt Style Sheets Examples#Customizing QGroupBox}{Customizing QGroupBox} + for an example. + + \row + \o QHeaderView \target qheaderview-widget + \o Supports the \l{box model}. The sections of the header view are + styled using the \l{#section-sub}{::section} sub control. The + \c{section} Sub-control supports the \l{#middle-ps}{:middle}, + \l{#first-ps}{:first}, \l{#last-ps}{:last}, + \l{#only-one-ps}{:only-one}, \l{#next-selected-ps}{:next-selected}, + \l{#previous-selected-ps}{:previous-selected}, + \l{#selected-ps}{:selected} pseudo states. + + Sort indicator in can be styled using the + \l{#up-arrow-sub}{::up-arrow} and the + \l{#down-arrow-sub}{::down-arrow} Sub-control. + + See \l{Qt Style Sheets Examples#Customizing QHeaderView}{Customizing QHeaderView} + for an example. + + \row + \o QLabel \target qlabel-widget + \o Supports the \l{box model}. Does not support the + \l{#hover-ps}{:hover} pseudo-state. + + Since 4.3, setting a stylesheet on a QLabel automatically + sets the QFrame::frameStyle property to QFrame::StyledPanel. + + See \l{Qt Style Sheets Examples#Customizing QFrame}{Customizing QFrame} for an + example (a QLabel derives from QFrame). + + \row + \o QLineEdit \target qlineedit-widget + \o Support the \l{box model}. + + The color and background of the selected item is styled using + \l{#selection-color-prop}{selection-color} and + \l{#selection-background-color-prop}{selection-background-color} + respectively. + + The password character can be styled using the + \l{#lineedit-password-character-prop}{lineedit-password-character} + property. + + See \l{Qt Style Sheets Examples#Customizing QLineEdit}{Customizing QLineEdit} + for an example. + + \row + \o QListView \target qlistview-widget + \o Supports the \l{box model}. When + \l{QAbstractItemView::alternatingRowColors}{alternating row colors} + is enabled, the alternating colors can be styled using the + \l{#alternate-background-color-prop}{alternate-background-color} + property. + + The color and background of the selected item is styled using + \l{#selection-color-prop}{selection-color} and + \l{#selection-background-color-prop}{selection-background-color} + respectively. + + The selection behavior is controlled by the + \l{#show-decoration-selected-prop}{show-decoration-selected} property. + + Use the \l{#item-sub}{::item} subcontrol for more fine grained + control over the items in the QListView. + + See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to + style scrollable backgrounds. + + See \l{Qt Style Sheets Examples#Customizing QListView} + {Customzing QListView} for an example. + + \row + \o QListWidget \target qlistwidget-widget + \o See \l{#qlistview-widget}{QListView}. + + \row + \o QMainWindow \target qmainwindow-widget + \o Supports styling of the separator + + The separator in a QMainWindow when using QDockWidget is styled + using the \l{#separator-sub}{::separator} subcontrol. + + See \l{Qt Style Sheets Examples#Customizing QMainWindow}{Customizing QMainWindow} + for an example. + + \row + \o QMenu \target qmenu-widget + \o Supports the \l{box model}. + + Individual items are styled using the \l{#item-sub}{::item} + subcontrol. In addition to the usually supported pseudo states, + \c{item} subcontrol supports the + \l{#selected-ps}{:selected}, \l{#default-ps}{:default}, + \l{#exclusive-ps}{:exclusive} and the + \l{#non-exclusive-ps}{non-exclusive} pseudo states. + + The indicator of checkable menu items is styled using the + \l{#indicator-sub}{::indicator} subcontrol. + + The separator is styled using the \l{#separator-sub}{::separator} + subcontrol. + + For items with a sub menu, the arrow marks are styled using the + \l{::right-arrow-sub}{right-arrow} and + \l{::left-arrow-sub}{left-arrow}. + + The scroller is styled using the \l{#scroller-sub}{::scroller}. + + The tear-off is styled using the \l{#tear-off-sub}{::tear-off}. + + See \l{Qt Style Sheets Examples#Customizing QMenu}{Customizing QMenu} + for an example. + + \row + \o QMenuBar \target qmenubar-widget + \o Supports the \l{box model}. The \l{#spacing-prop}{spacing} + property specifies the spacing between menu items. + Individual items are styled using the \l{#item-sub}{::item} + subcontrol. + + \warning When running on Qt/Mac, the menu bar is usually embedded into the + system-wide menu bar. In this case, the style sheet will have no effect. + + See \l{Qt Style Sheets Examples#Customizing QMenuBar}{Customizing QMenuBar} + for an example. + + \row + \o QMessageBox \target qmessagebox-widget + \o The \l{#messagebox-text-interaction-flags-prop} + {messagebox-text-interaction-flags} property can be used to alter + the interaction with text in the message box. + + \row + \o QProgressBar \target qprogressbar-widget + \o Supports the \l{box model}. The chunks of the progress bar + can be styled using the \l{#chunk-sub}{::chunk} subcontrol. + The chunk is displayed on the Contents rectangle of the widget. + + If the progress bar displays text, use the \l{text-align-prop}{text-align} + property to position the text. + + Indeterminate progress bars have the + \l{#indeterminate-ps}{:indeterminate} pseudo state set. + + See \l{Qt Style Sheets Examples#Customizing QProgressBar}{Customizing QProgressBar} + for an example. + + \row + \o QPushButton \target qpushbutton-widget + \o Supports the \l{box model}. Supports the \l{#default-ps}{:default}, + \l{#flat-ps}{:flat}, \l{#checked-ps}{:checked} pseudo states. + + For QPushButton with a menu, the menu indicator is styled + using the \l{#menu-indicator-sub}{::menu-indicator} + subcontrol. Appearance of checkable push buttons can be + customized using the \l{#open-ps}{:open} and + \l{#closed-ps}{:closed} pseudo-states. + + \warning If you only set a background-color on a QPushButton, the background + may not appear unless you set the border property to some value. This is + because, by default, the QPushButton draws a native border which completely + overlaps the background-color. For example, + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 30 + + See \l{Qt Style Sheets Examples#Customizing QPushButton}{Customizing QPushButton} + for an example. + + \row + \o QRadioButton \target qradiobutton-widget + \o Supports the \l{box model}. The check indicator can be + styled using the \l{#indicator-sub}{::indicator} + subcontrol. By default, the indicator is placed in the Top + Left corner of the Contents rectangle of the widget. + + The \l{#spacing-prop}{spacing} property + specifies the spacing between the check indicator and + the text. + + See \l{Qt Style Sheets Examples#Customizing QRadioButton} + {Customizing QRadioButton} for an example. + + \row + \o QScrollBar \target qscrollbar-widget + \o Supports the \l{box model}. The Contents rectangle of the widget + is considered to be the groove over which the slider moves. The extent + of the QScrollBar (i.e the width or the height depending on the orientation) + is set using the \l{#width-prop}{width} or \l{#height-prop}{height} property + respectively. To determine the orientation, use the + \l{#horizontal-ps}{:horizontal} and the \l{vertical-ps}{:vertical} + pseudo states. + + The slider can be styled using the \l{#handle-sub}{::handle} subcontrol. + Setting the \l{#min-width-prop}{min-width} or \l{#min-height-prop}{min-height} + provides size contraints for the slider depending on the orientation. + + The \l{add-line-sub}{::add-line} subcontrol can be used to style the + button to add a line. By default, the add-line subcontrol is placed in + top right corner of the Border rectangle of the widget. Depending on the + orientation the \l{#right-arrow-sub}{::right-arrow} or + \l{#down-arrow-sub}{::down-arrow}. By default, the arrows are placed in + the center of the Contents rectangle of the add-line subcontrol. + + The \l{sub-line-sub}{::sub-line} subcontrol can be used to style the + button to subtract a line. By default, the sub-line subcontrol is placed in + bottom right corner of the Border rectangle of the widget. Depending on the + orientation the \l{#left-arrow-sub}{::left-arrow} or + \l{#up-arrow-sub}{::up-arrow}. By default, the arrows are placed in + the center of the Contents rectangle of the sub-line subcontrol. + + The \l{sub-page-sub}{::sub-page} subcontrol can be used to style the + region of the slider that subtracts a page. The \l{add-page-sub}{::add-page} + subcontrol can be used to style the region of the slider that adds a page. + + See \l{Qt Style Sheets Examples#Customizing QScrollBar}{Customizing QScrollBar} + for an example. + + \row + \o QSizeGrip \target qsizegrip-widget + \o Supports the \l{#width-prop}{width}, + \l{#height-prop}{height}, and \l{#image-prop}{image} + properties. + + See \l{Qt Style Sheets Examples#Customizing QSizeGrip}{Customizing QSizeGrip} + for an example. + + \row + \o QSlider \target qslider-widget + \o Supports the \l{box model}. For horizontal slides, the + \l{min-width-prop}{min-width} and \l{height-prop}{height} + properties must be provided. For vertical sliders, the + \l{min-height-prop}{min-height} and \l{width-prop}{width} + properties must be provided. + + The groove of the slider is styled + using the \l{#groove-sub}{::groove}. The groove is + positioned by default in the Contents rectangle of the widget. + The thumb of the slider is styled using \l{#handle-sub}{::handle} + subcontrol. The subcontrol moves in the Contents rectangle of + the groove subcontrol. + + See \l{Qt Style Sheets Examples#Customizing QSlider}{Customizing QSlider} + for an example. + + \row + \o QSpinBox \target qspinbox-widget + \o The frame of the spin box can be styled using the \l{box + model}. + + The up button and arrow can be styled using the + \l{#up-button-sub}{::up-button} and + \l{#up-arrow-sub}{::up-arrow} subcontrols. By default, + the up-button is placed in the top right corner in the + Padding rectangle of the widget. Without an explicit size, + it occupies half the height of its reference rectangle. + The up-arrow is placed in the center of the Contents + rectangle of the up-button. + + The down button and arrow can be styled using the + \l{#down-button-sub}{::down-button} and + \l{#down-arrow-sub}{::down-arrow} subcontrols. By default, + the down-button is placed in the bottom right corner in the + Padding rectangle of the widget. Without an explicit size, + it occupies half the height of its reference rectangle. + The bottom-arrow is placed in the center of the Contents + rectangle of the bottom-button. + + See \l{Qt Style Sheets Examples#Customizing QSpinBox}{Customizing QSpinBox} + for an example. + + \row + \o QSplitter \target qsplitter-widget + \o Supports the \l{box model}. The handle of the splitter + is styled using the \l{#handle-sub}{::handle} subcontrol. + + See \l{Qt Style Sheets Examples#Customizing QSplitter}{Customizing QSplitter} + for an example. + + \row + \o QStatusBar \target qstatusbar-widget + \o Supports only the \l{Qt Style Sheets Reference#background-prop} + {background} property. + The frame for individual items can be style using the + \l{#item-sub}{::item} subcontrol. + + See \l{Qt Style Sheets Examples#Customizing QStatusBar}{Customizing QStatusBar} + for an example. + + \row + \o QTabBar \target qtabbar-widget + \o Individual tabs may be styled using the \l{#tab-sub}{::tab} subcontrol. + Close buttons using the \l{#close-button-sub}{::close-button} + The tabs support the + \l{#only-one-ps}{:only-one}, \l{#first-ps}{:first}, + \l{#last-ps}{:last}, \l{#middle-ps}{:middle}, + \l{#previous-selected-ps}{:previous--selected}, + \l{#next-selected-ps}{:next-selected}, + \l{#selected-ps}{:selected} pseudo states. + + The \l{#top-ps}{:top}, \l{#left-ps}{:left}, \l{#right-ps}{:right}, + \l{#bottom-ps}{:bottom} pseudo states depending on the orientation + of the tabs. + + Overlapping tabs for the selected state are created by using + negative margins or using the \c{absolute} position scheme. + + The tear indicator of the QTabBar is styled using the + \l{#tear-sub}{::tear} subcontrol. + + QTabBar used two QToolButtons for its scrollers that can be styled + using the \c{QTabBar QToolButton} selector. To specify the width + of the scroll button use the \l{#scroller-sub}{::scroller} + subcontrol. + + The alignment of the tabs within the QTabBar is styled + using the \l{#Alignment}{alignment} property. \warning + + To change the position of the QTabBar within a QTabWidget, use the + \l{#tab-bar-sub}{tab-bar} subcontrol (and set subcontrol-position). + + See \l{Qt Style Sheets Examples#Customizing QTabWidget and QTabBar}{Customizing QTabBar} + for an example. + + \row + \o QTabWidget \target qtabwidget-widget + \o The frame of the tab widget is styled using the + \l{#pane-sub}{::pane} subcontrol. The left and right + corners are styled using the \l{#left-corner-sub}{::left-corner} + and \l{#right-corner-sub}{::right-corner} respectively. + The position of the tab bar is controlled using the + \l{#tab-bar-sub}{::tab-bar} subcontrol. + + By default, the subcontrols have positions of a QTabWidget in + the QWindowsStyle. To place the QTabBar in the center, set the + subcontrol-position of the tab-bar subcontrol. + + The \l{#top-ps}{:top}, \l{#left-ps}{:left}, \l{#right-ps}{:right}, + \l{#bottom-ps}{:bottom} pseudo states depending on the orientation + of the tabs. + + See \l{Qt Style Sheets Examples#Customizing QTabWidget and QTabBar} + {Customizing QTabWidget} for an example. + + \row + \o QTableView \target qtableview-widget + \o Supports the \l{box model}. When + \l{QAbstractItemView::alternatingRowColors}{alternating row colors} + is enabled, the alternating colors can be styled using the + \l{#alternate-background-color-prop}{alternate-background-color} + property. + + The color and background of the selected item is styled using + \l{#selection-color-prop}{selection-color} and + \l{#selection-background-color-prop}{selection-background-color} + respectively. + + The corner widget in a QTableView is implemented as a QAbstractButton + and can be styled using the "QTableView QTableCornerButton::section" + selector. + + \warning If you only set a background-color on a QTableCornerButton, + the background may not appear unless you set the border property to + some value. This is because, by default, the QTableCornerButton draws a + native border which completely overlaps the background-color. + + The color of the grid can be specified using the + \l{#gridline-color-prop}{gridline-color} property. + + See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to + style scrollable backgrounds. + + See \l{Qt Style Sheets Examples#Customizing QTableView} + {Customzing QTableView} for an example. + + \row + \o QTableWidget \target qtablewidget-widget + \o See \l{#qtableview-widget}{QTableView}. + + \row + \o QTextEdit \target qtextedit-widget + \o Supports the \l{box model}. + + The color and background of selected text is styled using + \l{#selection-color-prop}{selection-color} and + \l{#selection-background-color-prop}{selection-background-color} + respectively. + + See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to + style scrollable backgrounds. + + \row + \o QTimeEdit \target qtimeedit-widget + \o See \l{#qspinbox-widget}{QSpinBox}. + + \row + \o QToolBar \target qtoolbar-widget + \o Supports the \l{box model}. + + The \l{#top-ps}{:top}, \l{#left-ps}{:left}, \l{#right-ps}{:right}, + \l{#bottom-ps}{:bottom} pseudo states depending on the area in + which the tool bar is grouped. + + The \l{#first-ps}{:first}, \l{#last-ps}{:last}, \l{#middle-ps}{:middle}, + \l{#only-one-ps}{:only-one} pseudo states indicator the position + of the tool bar within a line group (See + QStyleOptionToolBar::positionWithinLine). + + The separator of a QToolBar is styled using the + \l{#separator-sub}{::separator} subcontrol. + + The handle (to move the toolbar) is styled using the + \l{#handle-sub}{::handle} subcontrol. + + See \l{Qt Style Sheets Examples#Customizing QToolBar}{Customizing QToolBar} + for an example. + + \row + \o QToolButton \target qtoolbutton-widget + \o Supports the \l{box model}. + + If the QToolButton has a menu, is + \l{#menu-indicator-sub}{::menu-indicator} subcontrol can be used to + style the indicator. By default, the menu-indicator is positioned + at the bottom right of the Padding rectangle of the widget. + + If the QToolButton is in QToolButton::MenuButtonPopup mode, + the \l{#menu-button-sub}{::menu-button} subcontrol is used to draw the + menu button. \l{#menu-arrow-sub}{::menu-arrow} subcontrol is used to + draw the menu arrow inside the menu-button. By default, it is + positioned in the center of the Contents rectangle of the + menu-button subcontrol. + + When the QToolButton displays arrows, the \l{#up-arrow-sub}{::up-arrow}, + \l{#down-arrow-sub}{::down-arrow}, \l{#left-arrow-sub}{::left-arrow} + and \l{#right-arrow-sub}{::right-arrow} subcontrols are used. + + \warning If you only set a background-color on a QToolButton, the background + will not appear unless you set the border property to some value. This is + because, by default, the QToolButton draws a native border which completely + overlaps the background-color. For example, + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 31 + + See \l{Qt Style Sheets Examples#Customizing QToolButton}{Customizing QToolButton} + for an example. + + \row + \o QToolBox \target qtoolbox-widget + \o Supports the \l{box model}. + + The individual tabs can by styled using the + \l{#tab-sub}{::tab} subcontrol. The tabs support the + \l{#only-one-ps}{:only-one}, \l{#first-ps}{:first}, + \l{#last-ps}{:last}, \l{#middle-ps}{:middle}, + \l{#previous-selected-ps}{:previous-selected}, + \l{#next-selected-ps}{:next-selected}, + \l{#selected-ps}{:selected} pseudo states. + + \row + \o QToolTip \target qtooltip-widget + \o Supports the \l{box model}. The \l{#opacity-prop}{opacity} + property controls the opacity of the tooltip. + + See \l{Qt Style Sheets Examples#Customizing QFrame}{Customizing QFrame} + for an example (a QToolTip is a QFrame). + + \row + \o QTreeView \target qtreeview-widget + \o Supports the \l{box model}. When + \l{QAbstractItemView::alternatingRowColors}{alternating row colors} + is enabled, the alternating colors can be styled using the + \l{#alternate-background-color-prop}{alternate-background-color} + property. + + The color and background of the selected item is styled using + \l{#selection-color-prop}{selection-color} and + \l{#selection-background-color-prop}{selection-background-color} + respectively. + + The selection behavior is controlled by the + \l{#show-decoration-selected-prop}{show-decoration-selected} property. + + The branches of the tree view can be styled using the + \l{#branch-sub}{::branch} subcontrol. The + ::branch Sub-control supports the \l{open-ps}{:open}, + \l{closed-ps}{:closed}, \l{has-siblings-ps}{:has-sibling} and + \l{has-children-ps}{:has-children} pseudo states. + + Use the \l{#item-sub}{::item} subcontrol for more fine grained + control over the items in the QTreeView. + + See \l{qabstractscrollarea-widget}{QAbsractScrollArea} to + style scrollable backgrounds. + + See \l{Qt Style Sheets Examples#Customizing QTreeView}{Customizing QTreeView} + for an example to style the branches. + + \row + \o QTreeWidget \target qtreewidget-widget + \o See \l{#qtreeview-widget}{QTreeView}. + + \row + \o QWidget \target qwidget-widget + \o Supports only the \l{Qt Style Sheets Reference#background-prop}{background}, + \l{#background-clip-prop}{background-clip} and + \l{#background-origin-prop}{background-origin} properties. + + If you subclass from QWidget, you need to provide a paintEvent for your + custom QWidget as below: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 32 + + The above code is a no-operation if there is no stylesheet set. + + \warning Make sure you define the Q_OBJECT macro for your custom + widget. + + \endtable + + \section1 List of Properties + + The table below lists all the properties supported by Qt Style + Sheets. Which values can be given to an property depend on the + \l{List of Property Types}{property's type}. Unless otherwise + specified, properties below apply to all widgets. Properties + marked with an asterisk * are specific to Qt and have no equivalent + in CSS2 or CSS3. + + \table 100% + \header + \o Property + \o Type + \o Description + + \row + \o \bold{\c alternate-background-color} \target alternate-background-color-prop + \o \l{#Brush}{Brush} \BR + \o The \l{QAbstractItemView::alternatingRowColors} + {alternate background color} used in QAbstractItemView subclasses. + + If this property is not set, the default value is + whatever is set for the palette's + \l{QPalette::}{AlternateBase} role. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 33 + + See also \l{Qt Style Sheets Reference#background-prop}{background} and + \l{#selection-background-color-prop}{selection-background-color}. + + \row + \o \bold{\c background} \target background-prop + \o \l{#Background}{Background} + \o Shorthand notation for setting the background. Equivalent + to specifying \c background-color, \c background-image, \c + background-repeat, and/or \c background-position. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QDialog, QFrame, QGroupBox, QLabel, QLineEdit, + QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter, + QTextEdit, QToolTip, and plain \l{QWidget}s. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 34 + + + Often, it is required to set a fill pattern similar to the styles + in Qt::BrushStyle. You can use the background-color property for + Qt::SolidPattern, Qt::RadialGradientPattern, Qt::LinearGradientPattern + and Qt::ConicalGradientPattern. The other patterns are easily achieved + by creating a background image that contains the pattern. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 35 + + See also \l{#background-origin-prop}{background-origin}, + \l{#selection-background-color-prop}{selection-background-color}, + \l{#background-clip-prop}{background-clip}, + \l{#background-attachment-prop}{background-attachment} + and \l{#alternate-background-color-prop}{alternate-background-color}. + + \row + \o \c background-color \target background-color-prop + \o \l{#Brush}{Brush} \BR + \o The background color used for the widget. + + Examples: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 36 + + \row + \o \c background-image \target background-image-prop + \o \l{#Url}{Url} + \o The background image used for the widget. Semi-transparent + parts of the image let the \c background-color shine + through. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 37 + + \row + \o \c background-repeat \target background-repeat-prop + \o \l{#Repeat}{Repeat} + \o Whether and how the background image is repeated to fill + the \c background-origin rectangle. + + If this property is not specified, the background image + is repeated in both directions (\c repeat). + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 38 + + \row + \o \c background-position + \o \l{#Alignment}{Alignment} + \o The alignment of the background image within the \c + background-origin rectangle. + + If this property is not specified, the alignment is \c + top \c left. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 39 + + \row + \o \bold{\c background-attachment} \target background-attachment-prop + \o \l{#Attachment}{Attachment} + \o Determines whether the background-image in a QAbstractScrollArea + is scrolled or fixed with respect to the viewport. + By default, the background-image scrolls with the viewport. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 40 + + See also \l{Qt Style Sheets Reference#background-prop}{background} + + \row + \o \bold{\c background-clip} \target background-clip-prop + \o \l{#Origin}{Origin} + \o The widget's rectangle, in which the \c background is drawn. + + This property specifies the rectangle to which the \c background-color + and \c background-image are clipped. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QDialog, QFrame, QGroupBox, QLabel, + QPushButton, QRadioButton, QSplitter, QTextEdit, QToolTip, + and plain \l{QWidget}s. + + If this property is not specified, the default is \c + border. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 41 + + See also \l{Qt Style Sheets Reference#background-prop}{background}, + \l{#background-origin-prop}{background-origin} and \l{The Box Model}. + + \row + \o \bold{\c background-origin} \target background-origin-prop + \o \l{#Origin}{Origin} + \o The widget's background rectangle, to use in conjunction + with \c background-position and \c background-image. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QDialog, QFrame, QGroupBox, QLabel, + QPushButton, QRadioButton, QSplitter, QTextEdit, QToolTip, + and plain \l{QWidget}s. + + If this property is not specified, the default is \c + padding. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 42 + + See also \l{Qt Style Sheets Reference#background-prop}{background} and + \l{The Box Model}. + + \row + \o \bold{\c border} \target border-prop + \o \l{#Border}{Border} + \o Shorthand notation for setting the widget's border. Equivalent + to specifying \c border-color, \c border-style, and/or + \c border-width. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, + QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter, + QTextEdit, QToolTip, and plain \l{QWidget}s. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 43 + + \row + \o \c border-top + \o \l{#Border}{Border} + \o Shorthand notation for setting the widget's top border. + Equivalent to specifying \c border-top-color, \c + border-top-style, and/or \c border-top-width. + + \row + \o \c border-right + \o \l{#Border}{Border} + \o Shorthand notation for setting the widget's right border. + Equivalent to specifying \c border-right-color, \c + border-right-style, and/or \c border-right-width. + + \row + \o \c border-bottom + \o \l{#Border}{Border} + \o Shorthand notation for setting the widget's bottom border. + Equivalent to specifying \c border-bottom-color, \c + border-bottom-style, and/or \c border-bottom-width. + + \row + \o \c border-left + \o \l{#Border}{Border} + \o Shorthand notation for setting the widget's left border. + Equivalent to specifying \c border-left-color, \c + border-left-style, and/or \c border-left-width. + + \row + \o \bold{\c border-color} \target border-attrs + \target border-color-prop + \o \l{#Box Colors}{Box Colors} + \o The color of all the border's edges. Equivalent to + specifying \c border-top-color, \c border-right-color, \c + border-bottom-color, and \c border-left-color. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, + QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter, + QTextEdit, QToolTip, and plain \l{QWidget}s. + + If this property is not specified, it defaults to + \l{#color-prop}{color} (i.e., the widget's foreground + color). + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 44 + + See also \l{Qt Style Sheets Reference#border-style-prop}{border-style}, + \l{Qt Style Sheets Reference#border-width-prop}{border-width}, + \l{#border-image-prop}{border-image}, and \l{The Box Model}. + + \row + \o \c border-top-color + \o \l{#Brush}{Brush} \BR + \o The color of the border's top edge. + + \row + \o \c border-right-color + \o \l{#Brush}{Brush} \BR + \o The color of the border's right edge. + + \row + \o \c border-bottom-color + \o \l{#Brush}{Brush} \BR + \o The color of the border's bottom edge. + + \row + \o \c border-left-color + \o \l{#Brush}{Brush} \BR + \o The color of the border's left edge. + + \row + \o \bold{\c border-image} \target border-image-prop + \o \l{#Border Image}{Border Image} + \o The image used to fill the border. The image is cut into + nine parts and stretched appropriately if necessary. See + \l{#Border Image}{Border Image} for details. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, + QMenu, QMenuBar, QPushButton, QRadioButton, QSplitter, + QTextEdit and QToolTip. + + See also \l{#border-color-prop}{border-color}, + \l{Qt Style Sheets Reference#border-style-prop}{border-style}, + \l{Qt Style Sheets Reference#border-width-prop}{border-width}, and + \l{The Box Model}. + + \row + \o \bold{\c border-radius} \target border-radius-prop + \o \l{#Radius}{Radius} + \o The radius of the border's corners. Equivalent to + specifying \c border-top-left-radius, \c + border-top-right-radius, \c border-bottom-right-radius, + and \c border-bottom-left-radius. + + The border-radius clips the element's + \l{Qt Style Sheets Reference#background-prop}{background}. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu, + QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit, + and QToolTip. + + If this property is not specified, it defaults to 0. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 45 + + See also \l{Qt Style Sheets Reference#border-width-prop}{border-width} and + \l{The Box Model}. + + \row + \o \c border-top-left-radius + \o \l{#Radius}{Radius} + \o The radius of the border's top-left corner. + + \row + \o \c border-top-right-radius + \o \l{#Radius}{Radius} + \o The radius of the border's top-right corner. + + \row + \o \c border-bottom-right-radius + \o \l{#Radius}{Radius} + \o The radius of the border's bottom-right corner. Setting + this property to a positive value results in a rounded + corner. + + \row + \o \c border-bottom-left-radius + \o \l{#Radius}{Radius} + \o The radius of the border's bottom-left corner. Setting this + property to a positive value results in a rounded corner. + + \row + \o \bold{\c border-style} \target border-style-prop + \o \l {Border Style} + \o The style of all the border's edges. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu, + QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit, + and QToolTip. + + If this property is not specified, it defaults to \c none. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 46 + + See also \l{#border-color-prop}{border-color}, + \l{Qt Style Sheets Reference#border-style-prop}{border-style}, + \l{#border-image-prop}{border-image}, and \l{The Box Model}. + + \row + \o \c border-top-style + \o \l{#Border Style}{Border Style} + \o The style of the border's top edge. + + \row + \o \c border-right-style + \o \l{#Border Style}{Border Style} + \o The style of the border's right edge/ + + \row + \o \c border-bottom-style + \o \l{#Border Style}{Border Style} + \o The style of the border's bottom edge. + + \row + \o \c border-left-style + \o \l{#Border Style}{Border Style} + \o The style of the border's left edge. + + \row + \o \bold{\c border-width} \target border-width-prop + \o \l{#Box Lengths}{Box Lengths} + \o The width of the border. Equivalent to setting \c + border-top-width, \c border-right-width, \c + border-bottom-width, and \c border-left-width. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu, + QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit, + and QToolTip. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 47 + + See also \l{#border-color-prop}{border-color}, + \l{#border-radius-prop}{border-radius}, + \l{Qt Style Sheets Reference#border-style-prop}{border-style}, + \l{#border-image-prop}{border-image}, and + \l{The Box Model}. + + \row + \o \c border-top-width + \o \l{#Length}{Length} + \o The width of the border's top edge. + + \row + \o \c border-right-width + \o \l{#Length}{Length} + \o The width of the border's right edge. + + \row + \o \c border-bottom-width + \o \l{#Length}{Length} + \o The width of the border's bottom edge. + + \row + \o \c border-left-width + \o \l{#Length}{Length} + \o The width of the border's left edge. + + \row + \o \bold{\c bottom} \target bottom-prop + \o \l{#Length}{Length} + \o If \l{#position-prop}{position} is \c relative (the + default), moves a \l{subcontrol} by a certain offset up; + specifying \tt{bottom: \e{y}} is then equivalent to + specifying \tt{\l{Qt Style Sheets Reference#top-prop}{top}: -\e{y}}. + + If \l{#position-prop}{position} is \c absolute, the \c + bottom property specifies the subcontrol's bottom edge + in relation to the parent's bottom edge (see also + \l{Qt Style Sheets Reference#subcontrol-origin-prop} + {subcontrol-origin}). + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 48 + + See also \l{Qt Style Sheets Reference#left-prop}{left}, \l{#right-prop}{right}, and + \l{Qt Style Sheets Reference#top-prop}{top}. + + \row + \o \bold{\c button-layout} \target button-layout-prop + \o \l{#Number}{Number} + \o The layout of buttons in a QDialogButtonBox or + a QMessageBox. The possible values are 0 + (\l{QDialogButtonBox::}{WinLayout}), 1 + (\l{QDialogButtonBox::}{MacLayout}), 2 + (\l{QDialogButtonBox::}{KdeLayout}), and 3 + (\l{QDialogButtonBox::}{GnomeLayout}). + + If this property is not specified, it defaults to the + value specified by the current style for the + \l{QStyle::}{SH_DialogButtonLayout} style hint. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 49 + + \row + \o \bold{\c color} \target color-prop + \o \l{#Brush}{Brush} \BR + \o The color used to render text. + + This property is supported by all widgets that respect + the \l QWidget::palette. + + If this property is not set, the default is whatever is + set for in the widget's palette for the + QWidget::foregroundRole (typically black). + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 50 + + See also \l{Qt Style Sheets Reference#background-prop}{background} and + \l{#selection-color-prop}{selection-color}. + + \row + \o \bold{\c dialogbuttonbox-buttons-have-icons} + \o \l{#Boolean}{Boolean} + \o Whether the buttons in a QDialogButtonBox show icons + + If this property is set to 1, the buttons of a QDialogButtonBox + show icons; if it is set to 0, the icons are not shown. + + See the \l{Qt Style Sheets Reference#list of icons}{List of Icons} + section for information on how to set icons. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 51 + + \note Styles defining this property must be applied before the + QDialogButtonBox is created; this means that you must apply the + style to the parent widget or to the application itself. + + \omit + \row + \o \bold{\c etch-disabled-text}* + \o \l{#Boolean}{Boolean} + \o Whether disabled text is drawn etched. + + If this property is not specified, it defaults to the + value specified by the current style for the + \l{QStyle::}{SH_EtchDisabledText} style hint. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 52 + \endomit + + \row + \o \bold{\c font} \target font-prop + \o \l{#Font}{Font} + \o Shorthand notation for setting the text's font. Equivalent + to specifying \c font-family, \c font-size, \c font-style, + and/or \c font-weight. + + This property is supported by all widgets that respect + the \l QWidget::font. + + If this property is not set, the default is the + QWidget::font. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 53 + + \row + \o \c font-family + \o String + \o The font family. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 54 + + \row + \o \c font-size + \o \l{#Font Size}{Font Size} + \o The font size. In this version of Qt, only pt and px metrics are + supported. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 55 + + \row + \o \c font-style + \o \l {Font Style} + \o The font style. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 56 + + \row + \o \c font-weight + \o \l{#Font Weight}{Font Weight} + \o The weight of the font. + + \row + \o \bold{\c gridline-color}* \target gridline-color-prop + \o \l{#Color}{Color} \BR + \o The color of the grid line in a QTableView. + + If this property is not specified, it defaults to the + value specified by the current style for the + \l{QStyle::}{SH_Table_GridLineColor} style hint. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 57 + + \row + \o \bold{\c height} \target height-prop + \o \l{#Length}{Length} + \o The height of a \l{subcontrol} (or in some case, a widget). + + If this property is not specified, it defaults to a value + that depends on the subcontrol/widget and on the current style. + + \warning Unless otherwise specified, this property has no effect + when set on widgets. If you want a widget with a fixed height, set + the \l{#min-width-prop}{min-height} and + \l{#max-width-prop}{max-height} to the same value. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 58 + + See also \l{#width-prop}{width}. + + \row + \o \bold{\c icon-size} \target icon-size-prop + \o \l{#Length}{Length} + \o The width and height of the icon in a widget. + + The icon size of the following widgets can be set using this + property. + \list + \i QCheckBox + \i QListView + \i QPushButton + \i QRadioButton + \i QTabBar + \i QToolBar + \i QToolBox + \i QTreeView + \endlist + + \row + \o \bold{\c image}* \target image-prop + \o \l{#Url}{Url}+ + \o The image that is drawn in the contents rectangle of a + \l{subcontrol}. + + The image property accepts a list of \l{#Url}{Url}s or + an \c{svg}. The actual image that is drawn is determined + using the same algorithm as QIcon (i.e) the image is never scaled + up but always scaled down if necessary. If a \c{svg} is specified, + the image is scaled to the size of the contents rectangle. + + Setting the image property on sub controls implicitly sets the + width and height of the sub-control (unless the image in a SVG). + + In Qt 4.3 and later, the alignment of the + image within the rectangle can be specified using + \l{image-position-prop}{image-position}. + + \warning The QIcon SVG plugin is needed to render SVG images. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 59 + + \row + \o \bold{\c image-position} \target image-position-prop + \o \l{#Alignment}{alignment} + \o In Qt 4.3 and later, the alignment of the image image's position can be specified + using relative or absolute position. + + \row + \o \bold{\c left} \target left-prop + \o \l{#Length}{Length} + \o If \l{#position-prop}{position} is \c relative (the + default), moves a \l{subcontrol} by a certain offset to + the right. + + If \l{#position-prop}{position} is \c absolute, the \c + left property specifies the subcontrol's left edge in + relation to the parent's left edge (see also + \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}). + + If this property is not specified, it defaults to \c 0. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 60 + + See also \l{#right-prop}{right}, \l{Qt Style Sheets Reference#top-prop}{top}, and + \l{#bottom-prop}{bottom}. + + \row + \o \bold{\c lineedit-password- \BR \c character}* \target lineedit-password-character-prop + \o \l{#Number}{Number} + \o The QLineEdit password character as a Unicode number. + + If this property is not specified, it defaults to the + value specified by the current style for the + \l{QStyle::}{SH_LineEdit_PasswordCharacter} style hint. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 61 + + \row + \o \bold{\c margin} \target margin-prop + \o \l {Box Lengths} + \o The widget's margins. Equivalent to specifying \c + margin-top, \c margin-right, \c margin-bottom, and \c + margin-left. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu, + QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit, + and QToolTip. + + If this property is not specified, it defaults to \c 0. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 62 + + See also \l{Qt Style Sheets Reference#padding-prop}{padding}, + \l{#spacing-prop}{spacing}, and \l{The Box Model}. + + \row + \o \c margin-top + \o \l{#Length}{Length} + \o The widget's top margin. + + \row + \o \c margin-right + \o \l{#Length}{Length} + \o The widget's right margin. + + \row + \o \c margin-bottom + \o \l{#Length}{Length} + \o The widget's bottom margin. + + \row + \o \c margin-left + \o \l{#Length}{Length} + \o The widget's left margin. + + \row + \o \bold{\c max-height} \target max-height-prop + \o \l{#Length}{Length} + \o The widget's or a subcontrol's maximum height. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu, + QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox, + QSplitter, QStatusBar, QTextEdit, and QToolTip. + + The value is relative to the contents rect in the \l{The + Box Model}{box model}. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 63 + + See also \l{#max-width-prop}{max-width}. + + \row + \o \bold{\c max-width} \target max-width-prop + \o \l{#Length}{Length} + \o The widget's or a subcontrol's maximum width. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu, + QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox, + QSplitter, QStatusBar, QTextEdit, and QToolTip. + + The value is relative to the contents rect in the \l{The + Box Model}{box model}. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 64 + + See also \l{#max-height-prop}{max-height}. + + + \row + \o \bold{\c messagebox-text- \target messagebox-text-interaction-flags-prop + \BR \c interaction-flags}* + \o \l{#Number}{Number} + \o The interaction behavior for text in a message box. + Possible values are based on Qt::TextInteractionFlags. + + If this property is not specified, it defaults to the + value specified by the current style for the + \l{QStyle::}{SH_MessageBox_TextInteractionFlags} style + hint. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 65 + + \row + \o \bold{\c min-height} \target min-height-prop + \o \l{#Length}{Length} + \o The widget's or a subcontrol's minimum height. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu, + QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox, + QSplitter, QStatusBar, QTextEdit, and QToolTip. + + If this property is not specified, the minimum height is + derived based on the widget's contents and the style. + + The value is relative to the contents rect in the \l{The + Box Model}{box model}. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 66 + + See also \l{#min-width-prop}{min-width}. + + \row + \o \bold{\c min-width} \target min-width-prop + \o \l{#Length}{Length} + \o The widget's or a subcontrol's minimum width. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu, + QMenuBar, QPushButton, QRadioButton, QSizeGrip, QSpinBox, + QSplitter, QStatusBar, QTextEdit, and QToolTip. + + If this property is not specified, the minimum width is + derived based on the widget's contents and the style. + + The value is relative to the contents rect in the \l{The + Box Model}{box model}. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 67 + + See also \l{#min-height-prop}{min-height}. + + \row + \o \bold{\c opacity}* \target opacity-prop + \o \l{#Number}{Number} + \o The opacity for a widget. Possible values are from 0 + (transparent) to 255 (opaque). For the moment, this is + only supported for \l{QToolTip}{tooltips}. + + If this property is not specified, it defaults to the + value specified by the current style for the + \l{QStyle::}{SH_ToolTipLabel_Opacity} style hint. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 68 + + \row + \o \bold{\c padding} \target padding-prop + \o \l{#Box Lengths}{Box Lengths} + \o The widget's padding. Equivalent to specifying \c + padding-top, \c padding-right, \c padding-bottom, and \c + padding-left. + + This property is supported by QAbstractItemView + subclasses, QAbstractSpinBox subclasses, QCheckBox, + QComboBox, QFrame, QGroupBox, QLabel, QLineEdit, QMenu, + QMenuBar, QPushButton, QRadioButton, QSplitter, QTextEdit, + and QToolTip. + + If this property is not specified, it defaults to \c 0. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 69 + + See also \l{#margin-prop}{margin}, + \l{#spacing-prop}{spacing}, and \l{The Box Model}. + + \row + \o \c padding-top + \o \l{#Length}{Length} + \o The widget's top padding. + + \row + \o \c padding-right + \o \l{#Length}{Length} + \o The widget's right padding. + + \row + \o \c padding-bottom + \o \l{#Length}{Length} + \o The widget's bottom padding. + + \row + \o \c padding-left + \o \l{#Length}{Length} + \o The widget's left padding. + + \row + \o \bold{\c paint-alternating-row-colors-for-empty-area} + \target paint-alternating-row-colors-for-empty-area-prop + \o \c bool + \o Whether the QTreeView paints alternating row colors for the empty + area (i.e the area where there are no items) + + \row + \o \bold{\c position} \target position-prop + \o \c relative \BR + | \c absolute + \o Whether offsets specified using \l{Qt Style Sheets Reference#left-prop}{left}, + \l{#right-prop}{right}, \l{Qt Style Sheets Reference#top-prop}{top}, and + \l{#bottom-prop}{bottom} are relative or absolute + coordinates. + + If this property is not specified, it defaults to \c + relative. + + \row + \o \bold{\c right} \target right-prop + \o \l{#Length}{Length} + \o If \l{#position-prop}{position} is \c relative (the + default), moves a \l{subcontrol} by a certain offset to + the left; specifying \tt{right: \e{x}} is then equivalent + to specifying \tt{\l{Qt Style Sheets Reference#left-prop}{left}: -\e{x}}. + + If \l{#position-prop}{position} is \c absolute, the \c + right property specifies the subcontrol's right edge in + relation to the parent's right edge (see also + \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}). + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 70 + + See also \l{Qt Style Sheets Reference#left-prop}{left}, \l{Qt Style Sheets Reference#top-prop}{top}, and + \l{#bottom-prop}{bottom}. + + \row + \o \bold{\c selection-background-color}* \target selection-background-color-prop + \o \l{#Brush}{Brush} \BR + \o The background of selected text or items. + + This property is supported by all widgets that respect + the \l QWidget::palette and that show selection text. + + If this property is not set, the default value is + whatever is set for the palette's + \l{QPalette::}{Highlight} role. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 71 + + See also \l{#selection-color-prop}{selection-color} and + \l{Qt Style Sheets Reference#background-prop}{background}. + + \row + \o \bold{\c selection-color}* \target selection-color-prop + \o \l{#Brush}{Brush} \BR + \o The foreground of selected text or items. + + This property is supported by all widgets that respect + the \l QWidget::palette and that show selection text. + + If this property is not set, the default value is + whatever is set for the palette's + \l{QPalette::}{HighlightedText} role. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 72 + + See also + \l{#selection-background-color-prop}{selection-background-color} + and \l{#color-prop}{color}. + + \row + \o \bold{\c show-decoration- \target show-decoration-selected-prop + \BR \c selected}* + \o \l{#Boolean}{Boolean} + \o Controls whether selections in a QListView cover the + entire row or just the extent of the text. + + If this property is not specified, it defaults to the + value specified by the current style for the + \l{QStyle::}{SH_ItemView_ShowDecorationSelected} style + hint. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 73 + + \row + \o \bold{\c spacing}* \target spacing-prop + \o \l{#Length}{Length} + \o Internal spacing in the widget. + + This property is supported by QCheckBox, checkable + \l{QGroupBox}es, QMenuBar, and QRadioButton. + + If this property is not specified, the default value + depends on the widget and on the current style. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 74 + + See also \l{Qt Style Sheets Reference#padding-prop}{padding} and + \l{#margin-prop}{margin}. + + \row + \o \bold{\c subcontrol-origin}* \target subcontrol-origin-prop + \o \l{#Origin}{Origin} + \o The origin rectangle of the \l subcontrol within the + parent element. + + If this property is not specified, the default is \c + padding. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 75 + + See also + \l{Qt Style Sheets Reference#subcontrol-position-prop}{subcontrol-position}. + + \row + \o \bold{\c subcontrol-position}* \target subcontrol-position-prop + \o \l{#Alignment}{Alignment} + \o The alignment of the \l subcontrol within the origin + rectangle specified by \l{Qt Style Sheets Reference#subcontrol-origin-prop} + {subcontrol-origin}. + + If this property is not specified, it defaults to a value + that depends on the subcontrol. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 76 + + See also + \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}. + + \row + \o \bold{\c text-align} \target text-align-prop + \o \l{#Alignment}{Alignment} + \o The alignment of text and icon within the contents of the widget. + + If this value is not specified, it defaults to the value + that depends on the native style. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 77 + + This property is currently supported only by QPushButton + and QProgressBar. + + \row + \o \bold{\c text-decoration} + \o \c none \BR + \c underline \BR + \c overline \BR + \c line-through + \o Additional text effects + + \row + \o \bold{\c top} \target top-prop + \o \l{#Length}{Length} + \o If \l{#position-prop}{position} is \c relative (the + default), moves a \l{subcontrol} by a certain offset + down. + + If \l{#position-prop}{position} is \c absolute, the \c top + property specifies the subcontrol's top edge in relation + to the parent's top edge (see also + \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin}). + + If this property is not specified, it defaults to \c 0. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 78 + + See also \l{Qt Style Sheets Reference#left-prop}{left}, \l{#right-prop}{right}, and + \l{#bottom-prop}{bottom}. + + \row + \o \bold{\c width} \target width-prop + \o \l{#Length}{Length} + \o The width of a \l{subcontrol} (or a widget in some cases). + + If this property is not specified, it defaults to a value + that depends on the subcontrol/widget and on the current style. + + \warning Unless otherwise specified, this property has no effect + when set on widgets. If you want a widget with a fixed width, set + the \l{#min-width-prop}{min-width} and + \l{#max-width-prop}{max-width} to the same value. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 79 + + See also \l{#height-prop}{height}. + + \endtable + + \target list of icons + \section1 List of Icons + + Icons used in Qt can be customized using the following properties. Each of + the properties listed in this section have the type \l{#Icon}{Icon}. + + Note that for icons to appear in buttons in a QDialogButtonBox, you need to + set the dialogbuttonbox-buttons-have-icons property to true. Also, to + customize the size of the icons, use the icon-size property. + + \table 100% + \header + \o Name + \o QStyle::StandardPixmap + + \row + \o backward-icon + \o QStyle::SP_ArrowBack + + \row + \o cd-icon + \o QStyle::SP_DriveCDIcon + + \row + \o computer-icon + \o QStyle::SP_ComputerIcon + + \row + \o desktop-icon + \o QStyle::SP_DesktopIcon + + \row + \o dialog-apply-icon + \o QStyle::SP_DialogApplyButton + + \row + \o dialog-cancel-icon + \o QStyle::SP_DialogCancelButton + + \row + \o dialog-close-icon + \o QStyle::SP_DialogCloseButton + + \row + \o dialog-discard-icon + \o QStyle::SP_DialogDiscardButton + + \row + \o dialog-help-icon + \o QStyle::SP_DialogHelpButton + + \row + \o dialog-no-icon + \o QStyle::SP_DialogNoButton + + \row + \o dialog-ok-icon + \o QStyle::SP_DialogOkButton + + \row + \o dialog-open-icon + \o QStyle::SP_DialogOpenButton + + \row + \o dialog-reset-icon + \o QStyle::SP_DialogResetButton + + \row + \o dialog-save-icon + \o QStyle::SP_DialogSaveButton + + \row + \o dialog-yes-icon + \o QStyle::SP_DialogYesButton + + \row + \o directory-closed-icon + \o QStyle::SP_DirClosedIcon + + \row + \o directory-icon + \o QStyle::SP_DirIcon + + \row + \o directory-link-icon + \o QStyle::SP_DirLinkIcon + + \row + \o directory-open-icon + \o QStyle::SP_DirOpenIcon + + \row + \o dockwidget-close-icon + \o QStyle::SP_DockWidgetCloseButton + + \row + \o downarrow-icon + \o QStyle::SP_ArrowDown + + \row + \o dvd-icon + \o QStyle::SP_DriveDVDIcon + + \row + \o file-icon + \o QStyle::SP_FileIcon + + \row + \o file-link-icon + \o QStyle::SP_FileLinkIcon + + \omit + \row + \o filedialog-backward-icon + \o QStyle::SP_FileDialogBack + \endomit + + \row + \o filedialog-contentsview-icon + \o QStyle::SP_FileDialogContentsView + + \row + \o filedialog-detailedview-icon + \o QStyle::SP_FileDialogDetailedView + + \row + \o filedialog-end-icon + \o QStyle::SP_FileDialogEnd + + \row + \o filedialog-infoview-icon + \o QStyle::SP_FileDialogInfoView + + \row + \o filedialog-listview-icon + \o QStyle::SP_FileDialogListView + + \row + \o filedialog-new-directory-icon + \o QStyle::SP_FileDialogNewFolder + + \row + \o filedialog-parent-directory-icon + \o QStyle::SP_FileDialogToParent + + \row + \o filedialog-start-icon + \o QStyle::SP_FileDialogStart + + \row + \o floppy-icon + \o QStyle::SP_DriveFDIcon + + \row + \o forward-icon + \o QStyle::SP_ArrowForward + + \row + \o harddisk-icon + \o QStyle::SP_DriveHDIcon + + \row + \o home-icon + \o QStyle::SP_DirHomeIcon + + \row + \o leftarrow-icon + \o QStyle::SP_ArrowLeft + + \row + \o messagebox-critical-icon + \o QStyle::SP_MessageBoxCritical + + \row + \o messagebox-information-icon + \o QStyle::SP_MessageBoxInformation + + \row + \o messagebox-question-icon + \o QStyle::SP_MessageBoxQuestion + + \row + \o messagebox-warning-icon + \o QStyle::SP_MessageBoxWarning + + \row + \o network-icon + \o QStyle::SP_DriveNetIcon + + \row + \o rightarrow-icon + \o QStyle::SP_ArrowRight + + \row + \o titlebar-contexthelp-icon + \o QStyle::SP_TitleBarContextHelpButton + + \row + \o titlebar-maximize-icon + \o QStyle::SP_TitleBarMaxButton + + \row + \o titlebar-menu-icon + \o QStyle::SP_TitleBarMenuButton + + \row + \o titlebar-minimize-icon + \o QStyle::SP_TitleBarMinButton + + \row + \o titlebar-normal-icon + \o QStyle::SP_TitleBarNormalButton + + \row + \o titlebar-shade-icon + \o QStyle::SP_TitleBarShadeButton + + \row + \o titlebar-unshade-icon + \o QStyle::SP_TitleBarUnshadeButton + + \row + \o trash-icon + \o QStyle::SP_TrashIcon + + \row + \o uparrow-icon + \o QStyle::SP_ArrowUp + + \endtable + + \section1 List of Property Types + + The following table summarizes the syntax and meaning of the + different property types. + + \table 100% + \header + \o Type + \o Syntax + \o Description + + \row + \o \bold Alignment \target Alignment + \o \{ \c top \BR + | \c bottom \BR + | \c left \BR + | \c right \BR + | \c center \}* + \o Horizontal and/or vertical alignment. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 80 + + \row + \o \bold Attachment \target Attachment + \o \{ \c scroll \BR + | \c fixed \}* + \o Scroll or fixed attachment. + + \row + \o \bold Background \target Background + \o \{ \l{#Brush}{Brush} \BR + | \l{#Url}{Url} \BR + | \l{#Repeat}{Repeat} \BR + | \l{#Alignment}{Alignment} \}* + \o A sequence of \l{#Brush}{Brush}, \l{#Url}{Url}, + \l{#Repeat}{Repeat}, and \l{#Alignment}{Alignment}. + + \row + \o \bold Boolean \target Boolean + \o 0 | 1 + \o True (\c 1) or false (\c 0). + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 81 + + \row + \o \bold Border \target Border + \o \{ \l{#Border Style}{Border Style} \BR + | \l{#Length}{Length} \BR + | \l{#Brush}{Brush} \}* + \o Shorthand border property. + + \row + \o \bold{Border \target Border Image + Image} + \o \c none \BR + | \l{Url} \l{Number}\{4\} \BR (\c stretch | \c repeat){0,2} + \o A border image is an image that is composed of nine parts + (top left, top center, top right, center left, center, + center right, bottom left, bottom center, and bottom + right). When a border of a certain size is required, the + corner parts are used as is, and the top, right, bottom, + and left parts are stretched or repeated to produce a + border with the desired size. + + See the + \l{http://www.w3.org/TR/css3-background/#the-border-image} + {CSS3 Draft Specification} for details. + + \row + \o \bold{Border \target Border Style + Style} + \o \c dashed \BR + | \c dot-dash \BR + | \c dot-dot-dash \BR + | \c dotted \BR + | \c double \BR + | \c groove \BR + | \c inset \BR + | \c outset \BR + | \c ridge \BR + | \c solid \BR + | \c none + \o Specifies the pattern used to draw a border. + See the \l{http://www.w3.org/TR/css3-background/#border-style} + {CSS3 Draft Specification} for details. + + \row + \o \bold{Box \target Box Colors + Colors} + \o \l{#Brush}{Brush}\{1,4\} + \o One to four occurrences of \l{#Brush}{Brush}, specifying the top, + right, bottom, and left edges of a box, respectively. If + the left color is not specified, it is taken to be the + same as the right color. If the bottom color is not + specified, it is taken to be the same as the top color. If + the right color is not specified, it is taken to be the + same as the top color. + + Example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 82 + + \row + \o \bold{Box \target Box Lengths + Lengths} + \o \l{#Length}{Length}\{1,4\} + \o One to four occurrences of \l{#Length}{Length}, specifying the + top, right, bottom, and left edges of a box, + respectively. If the left length is not specified, it is + taken to be the same as the right length. If the bottom + length is not specified, is it taken to be the same as the + top length. If the right length is not specified, it is + taken to be the same as the top length. + + Examples: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 83 + + \row + \o \bold Brush \target Brush + \o \l{#Color}{Color} \BR + | \l{Gradient} \BR + | \l{PaletteRole} + \o Specifies a Color or a Gradient or an entry in the Palette. + + \row + \o \bold Color \target Color + \o \tt{rgb(\e{r}, \e{g}, \e{b})} \BR + | \tt{rgba(\e{r}, \e{g}, \e{b}, \e{a})} \BR + | \tt{hsv(\e{h}, \e{s}, \e{v})} \BR + | \tt{hsva(\e{h}, \e{s}, \e{v}, \e{a})} \BR + | \tt{#\e{rrggbb}} \BR + | \l{QColor::setNamedColor()}{Color Name} \BR + \o Specifies a color as RGB (red, green, blue) or RGBA + (red, green, blue, alpha) or HSV (hue, saturation, value) or HSVA + (hue, saturation, value, alpha) or a named color. The \c rgb() or \c rgba() + syntax can be used with integer values between 0 and 255, or with + percentages. The value of s, v, and a in \c hsv() or \c hsva() must all + be in the range 0-255; the value of h must be in the range 0-359. + + Examples: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 84 + + \note The RGB colors allowed are the same as those allowed with + CSS 2.1, as listed + \l{http://www.w3.org/TR/CSS21/syndata.html#color-units}{here}. + + \row + \o \bold Font \target Font + \o (\l{#Font Style}{Font Style} | \l{#Font Weight}{Font Weight}){0,2} \l{#Font Size}{Font Size} String + \o Shorthand font property. + + \row + \o \bold{Font \target Font Size + Size} + \o \l{Length} + \o The size of a font. + + \row + \o \bold{Font \target Font Style + Style} + \o \c normal \BR + | \c italic \BR + | \c oblique + \o The style of a font. + + \row + \o \bold{Font \target Font Weight + Weight} + \o \c normal \BR + | \c bold \BR + | \c 100 \BR + | \c 200 \BR + ... \BR + | \c 900 + \o The weight of a font. + + \row + \o \bold Gradient \target Gradient + \o \c qlineargradient \BR + | \c qradialgradient \BR + | \c qconicalgradient + \o Specifies gradient fills. There are three types of gradient fills: + + \list + \o \e{Linear} gradients interpolate colors between start and + end points. + \o \e{Radial} gradients interpolate colors between a focal + point and end points on a circle surrounding it. + \o \e{Conical} gradients interpolate colors around a center + point. + \endlist + + Gradients are specified in Object Bounding Mode. Imagine the box + in which the gradient is rendered, to have its top left corner at (0, 0) + and its bottom right corner at (1, 1). Gradient parameters are + then specified as percentages from 0 to 1. These values are + extrapolated to actual box coordinates at runtime. It is possible + specify values that lie outside the bounding box (-0.6 or 1.8, for + instance). + + \warning The stops have to appear sorted in ascending order. + + Examples: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 85 + + \row + \o \bold Icon \target Icon + \o (\l{#Url}{Url} (\c disabled | \c active | \c normal | \c selected)? + (\c on | \c off)? )* + \o A list of url, QIcon::Mode and QIcon::State. + + Example: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 86 + + \row + \o \bold Length \target Length + \o \l{#Number}{Number} (\c px | \c pt | \c em | \c ex)? + \o A number followed by a measurement unit. The CSS standard recommends + that user agents must + \l{http://www.w3.org/TR/CSS21/syndata.html#illegalvalues}{ignore} + a declaration with an illegal value. In Qt, it is mandatory to + specify measurement units. For compatibility with earlier versions + of Qt, numbers without measurement units are treated as pixels + in most contexts. The supported units are: + + \list + \o \c px: pixels + \o \c pt: the size of one point (i.e., 1/72 of an inch) + \o \c em: the em width of the font (i.e., the width of 'M') + \o \c ex: the ex width of the font (i.e., the height of 'x') + \endlist + + \row + \o \bold Number \target Number + \o A decimal integer or a real number + \o Examples: \c 0, \c 18, \c +127, \c -255, \c 12.34, \c -.5, + \c 0009. + + \row + \o \bold Origin \target Origin + \o \c margin \BR + | \c border \BR + | \c padding \BR + | \c content + \o Indicates which of four rectangles to use. + + \list + \o \c margin: The margin rectangle. The margin falls outside the border. + \o \c border: The border rectangle. This is where any border is drawn. + \o \c padding: The padding rectangle. Unlike the margins, + padding is located inside the border. + \o \c content: The content rectangle. This specifies where + the actual contents go, excluding any + padding, border, or margin. + \endlist + + See also \l{The Box Model}. + + \row + \o \bold PaletteRole \target PaletteRole + \o \c alternate-base \BR + | \c base \BR + | \c bright-text \BR + | \c button \BR + | \c button-text \BR + | \c dark \BR + | \c highlight \BR + | \c highlighted-text \BR + | \c light \BR + | \c link \BR + | \c link-visited \BR + | \c mid \BR + | \c midlight \BR + | \c shadow \BR + | \c text \BR + | \c window \BR + | \c window-text \BR + \o These values correspond the \l{QPalette::ColorRole}{Color roles} + in the widget's QPalette. + + For example, + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 87 + + \row + \o \bold Radius \target Radius + \o \l{#Length}{Length}\{1, 2\} + \o One or two occurrences of \l{#Length}{Length}. If only one length is + specified, it is used as the radius of the quarter circle + defining the corner. If two lengths are specified, the + first length is the horizontal radius of a quarter + ellipse, whereas the second length is the vertical radius. + + \row + \o \bold Repeat \target Repeat + \o \c repeat-x \BR + | \c repeat-y \BR + | \c repeat \BR + | \c no-repeat + \o A value indicating the nature of repetition. + + \list + \o \c repeat-x: Repeat horizontally. + \o \c repeat-y: Repeat vertically. + \o \c repeat: Repeat horizontally and vertically. + \o \c no-repeat: Don't repeat. + \endlist + + \row + \o \bold Url \target Url + \o \tt{url(\e{filename})} + \o \tt{\e{filename}} is the name of a file on the local disk + or stored using \l{the Qt Resource System}. Setting an + image implicitly sets the width and height of the element. + + \endtable + + \section1 List of Pseudo-States + + The following pseudo-states are supported: + + \table 100% + \header + \o Pseudo-State + \o Description + + \row \o \c :active \target active + \o This state is set when the widget resides in an active window. + + \row + \o \c :adjoins-item \target adjoins-item-ps + \o This state is set when the \l{#branch-sub}{::branch} of a QTreeView + is adjacent to an item. + + \row + \o \c :alternate \target alternate-ps + \o This state is set for every alternate row whe painting the row of + a QAbstractItemView when QAbstractItemView::alternatingRowColors() + is set to true. + + \row + \o \c :bottom \target bottom-ps + \o The item is positioned at the bottom. For example, a QTabBar + that has its tabs positioned at the bottom. + + \row + \o \c :checked \target checked-ps + \o The item is checked. For example, the + \l{QAbstractButton::checked}{checked} state of QAbstractButton. + + \row + \o \c :closable \target closable-ps + \o The items can be closed. For example, the QDockWidget has the + QDockWidget::DockWidgetClosable feature turned on. + + \row + \o \c :closed \target closed-ps + \o The item is in the closed state. For example, an non-expanded + item in a QTreeView + + \row + \o \c :default \target default-ps + \o The item is the default. For example, a + \l{QPushButton::default}{default} QPushButton or a default action + in a QMenu. + + \row + \o \c :disabled \target disabled-ps + \o The item is \l{QWidget::enabled}{disabled}. + + \row + \o \c :editable \target editable-ps + \o The QComboBox is editable. + + \row + \o \c :edit-focus \target edit-focus-ps + \o The item has edit focus (See QStyle::State_HasEditFocus). This state + is available only for Qt Extended applications. + + \row + \o \c :enabled \target enabled-ps + \o The item is \l{QWidget::enabled}{enabled}. + + \row + \o \c :exclusive \target exclusive-ps + \o The item is part of an exclusive item group. For example, a menu + item in a exclusive QActionGroup. + + \row + \o \c :first \target first-ps + \o The item is the first (in a list). For example, the first + tab in a QTabBar. + + \row + \o \c :flat \target flat-ps + \o The item is flat. For example, a + \l{QPushButton::flat}{flat} QPushButton. + + \row + \o \c :floatable \target floatable-ps + \o The items can be floated. For example, the QDockWidget has the + QDockWidget::DockWidgetFloatable feature turned on. + + \row + \o \c :focus \target focus-ps + \o The item has \l{QWidget::hasFocus()}{input focus}. + + \row + \o \c :has-children \target has-children-ps + \o The item has children. For example, an item in a + QTreeView that has child items. + + \row + \o \c :has-siblings \target has-siblings-ps + \o The item has siblings. For example, an item in a + QTreeView that siblings. + + \row + \o \c :horizontal \target horizontal-ps + \o The item has horizontal orientation + + \row + \o \c :hover \target hover-ps + \o The mouse is hovering over the item. + + \row + \o \c :indeterminate \target indeterminate-ps + \o The item has indeterminate state. For example, a QCheckBox + or QRadioButton is \l{Qt::PartiallyChecked}{partially checked}. + + \row + \o \c :last \target last-ps + \o The item is the last (in a list). For example, the last + tab in a QTabBar. + + \row + \o \c :left \target left-ps + \o The item is positioned at the left. For example, a QTabBar + that has its tabs positioned at the left. + + \row + \o \c :maximized \target maximized-ps + \o The item is maximized. For example, a maximized QMdiSubWindow. + + \row + \o \c :middle \target middle-ps + \o The item is in the middle (in a list). For example, a tab + that is not in the beginning or the end in a QTabBar. + + \row + \o \c :minimized \target minimized-ps + \o The item is minimized. For example, a minimized QMdiSubWindow. + + \row + \o \c :movable \target movable-ps + \o The item can be moved around. For example, the QDockWidget has the + QDockWidget::DockWidgetMovable feature turned on. + + \row + \o \c :no-frame \target no-frame-ps + \o The item has no frame. For example, a frameless QSpinBox + or QLineEdit. + + \row + \o \c :non-exclusive \target non-exclusive-ps + \o The item is part of a non-exclusive item group. For example, a menu + item in a non-exclusive QActionGroup. + + \row + \o \c :off \target off-ps + \o For items that can be toggled, this applies to items + in the "off" state. + + \row + \o \c :on \target on-ps + \o For items that can be toggled, this applies to widgets + in the "on" state. + + \row + \o \c :only-one \target only-one-ps + \o The item is the only one (in a list). For example, a lone tab + in a QTabBar. + + \row + \o \c :open \target open-ps + \o The item is in the open state. For example, an expanded + item in a QTreeView, or a QComboBox or QPushButton with + an open menu. + + \row + \o \c :next-selected \target next-selected-ps + \o The next item (in a list) is selected. For example, the + selected tab of a QTabBar is next to this item. + + \row + \o \c :pressed \target pressed-ps + \o The item is being pressed using the mouse. + + \row + \o \c :previous-selected \target previous-selected-ps + \o The previous item (in a list) is selected. For example, a + tab in a QTabBar that is next to the selected tab. + + \row + \o \c :read-only \target read-only-ps + \o The item is marked read only or non-editable. For example, + a read only QLineEdit or a non-editable QComboBox. + + \row + \o \c :right \target right-ps + \o The item is positioned at the right. For example, a QTabBar + that has its tabs positioned at the right. + + \row + \o \c :selected \target selected-ps + \o The item is selected. For example, the selected tab in + a QTabBar or the selected item in a QMenu. + + \row + \o \c :top \target top-ps + \o The item is positioned at the top. For example, a QTabBar + that has its tabs positioned at the top. + + \row + \o \c :unchecked \target unchecked-ps + \o The item is + \l{QAbstractButton::checked}{unchecked}. + + \row + \o \c :vertical \target vertical-ps + \o The item has vertical orientation. + + \row + \o \c :window \target window-ps + \o The widget is a window (i.e top level widget) + + \endtable + + \target subcontrols + \section1 List of Sub-Controls + + The following subcontrols are available: + + \table 100% + \header + \o Sub-Control + \o Description + + \row + \o \c ::add-line \target add-line-sub + \o The button to add a line of a QScrollBar. + + \row + \o \c ::add-page \target add-page-sub + \o The region between the handle (slider) and the \l{#add-line-sub}{add-line} + of a QScrollBar. + + \row + \o \c ::branch \target branch-sub + \o The branch indicator of a QTreeView. + + \row + \o \c ::chunk \target chunk-sub + \o The progress chunk of a QProgressBar. + + \row + \o \c ::close-button \target close-button-sub + \o The close button of a QDockWidget or tabs of QTabBar + + \row + \o \c ::corner \target corner-sub + \o The corner between two scrollbars in a QAbstractScrollArea + + \row + \o \c ::down-arrow \target down-arrow-sub + \o The down arrow of a QComboBox, QHeaderView (sort indicator), + QScrollBar or QSpinBox. + + \row + \o \c ::down-button \target down-button-sub + \o The down button of a QScrollBar or a QSpinBox. + + \row + \o \c ::drop-down \target drop-down-sub + \o The drop-down button of a QComboBox. + + \row + \o \c ::float-button \target float-button-sub + \o The float button of a QDockWidget + + \row + \o \c ::groove \target groove-sub + \o The groove of a QSlider. + + \row + \o \c ::indicator \target indicator-sub + \o The indicator of a QAbstractItemView, a QCheckBox, a QRadioButton, + a checkable QMenu item or a checkable QGroupBox. + + \row + \o \c ::handle \target handle-sub + \o The handle (slider) of a QScrollBar, a QSplitter, or a QSlider. + + \row + \o \c ::icon \target icon-sub + \o The icon of a QAbstractItemView or a QMenu. + + \row + \o \c ::item \target item-sub + \o An item of a QAbstractItemView, a QMenuBar, a QMenu, or + a QStatusBar. + + \row + \o \c ::left-arrow \target left-arrow-sub + \o The left arrow of a QScrollBar. + + \row + \o \c ::left-corner \target left-corner-sub + \o The left corner of a QTabWidget. For example, this control can be + used to control position the left corner widget in a QTabWidget. + + \row + \o \c ::menu-arrow \target menu-arrow-sub + \o The arrow of a QToolButton with a menu. + + \row + \o \c ::menu-button \target menu-button-sub + \o The menu button of a QToolButton. + + \row + \o \c ::menu-indicator \target menu-indicator-sub + \o The menu indicator of a QPushButton. + + \row + \o \c ::right-arrow \target right-arrow-sub + \o The right arrow of a QMenu or a QScrollBar. + + \row + \o \c ::pane \target pane-sub + \o The pane (frame) of a QTabWidget. + + \row + \o \c ::right-corner \target right-corner-sub + \o The right corner of a QTabWidget. For example, this control can be + used to control the position the right corner widget in a QTabWidget. + + \row + \o \c ::scroller \target scroller-sub + \o The scroller of a QMenu or QTabBar. + + \row + \o \c ::section \target section-sub + \o The section of a QHeaderView. + + \row + \o \c ::separator \target separator-sub + \o The separator of a QMenu or in a QMainWindow. + + \row + \o \c ::sub-line \target sub-line-sub + \o The button to subtract a line of a QScrollBar. + + \row + \o \c ::sub-page \target sub-page-sub + \o The region between the handle (slider) and the \l{#sub-line-sub}{sub-line} + of a QScrollBar. + + \row + \o \c ::tab \target tab-sub + \o The tab of a QTabBar or QToolBox. + + \row + \o \c ::tab-bar \target tab-bar-sub + \o The tab bar of a QTabWidget. This subcontrol exists only to + control the position of the QTabBar inside the QTabWidget. To + style the tabs using the \l{#tab-sub}{::tab} subcontrol. + + \row + \o \c ::tear \target tear-sub + \o The tear indicator of a QTabBar. + + \row + \o \c ::tear-off \target tear-off-sub + \o The tear-off indicator of a QMenu. + + \row + \o \c ::text \target text-ps + \o The text of a QAbstractItemView. + + \row + \o \c ::title \target title-sub + \o The title of a QGroupBox or a QDockWidget. + + \row + \o \c ::up-arrow \target up-arrow-sub + \o The up arrow of a QHeaderView (sort indicator), QScrollBar + or a QSpinBox. + + \row + \o \c ::up-button \target up-button-sub + \o The up button of a QSpinBox. + + \endtable + + See \l{Customizing the QPushButton's Menu Indicator Sub-Control} + for an example of how to customize a subcontrol. + */ + +/*! + \page stylesheet-examples.html + \contentspage {Qt Style Sheet}{Contents} + \previouspage Qt Style Sheets Reference + \title Qt Style Sheets Examples + + We will now see a few examples to get started with using Qt Style Sheets. + + \tableofcontents + \section1 Style Sheet Usage + + \section2 Customizing the Foreground and Background Colors + + Let's start by setting yellow as the background color of all + \l{QLineEdit}s in an application. This could be achieved like + this: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 88 + + If we want the property to apply only to the \l{QLineEdit}s that are + children (or grandchildren or grand-grandchildren) of a specific dialog, + we would rather do this: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 89 + + If we want the property to apply only to one specific QLineEdit, + we can give it a name using QObject::setObjectName() and use an + ID Selector to refer to it: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 90 + + Alternatively, we can set the + \l{Qt Style Sheets Reference#background-prop}{background-color} property directly on the + QLineEdit, omitting the selector: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 91 + + To ensure a good contrast, we should also specify a suitable + color for the text: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 92 + + It might be a good idea to change the colors used for selected + text as well: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 93 + + + \section2 Customizing Using Dynamic Properties + + There are many situations where we need to present a form that + has mandatory fields. To indicate to the user that the field is + mandatory, one effective (albeit esthetically dubious) solution + is to use yellow as the background color for those fields. It + turns out this is very easy to implement using Qt Style Sheets. + First, we would use the following application-wide style sheet: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 94 + + This means that every widget whose \c mandatoryField Qt property + is set to true would have a yellow background. + + Then, for each mandatory field widget, we would simply create a + \c mandatoryField property on the fly and set it to true. For + example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 95 + + \section2 Customizing a QPushButton Using the Box Model + + This time, we will show how to create a red QPushButton. This + QPushButton would presumably be connected to a very destructive + piece of code. + + First, we are tempted to use this style sheet: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 96 + + However, the result is a boring, flat button with no borders: + + \image stylesheet-redbutton1.png A flat red button + + What happened is this: + + \list + \o We have made a request that cannot be satisfied using the + native styles alone (e.g., the Windows XP theme engine doesn't + let us specify the background color of a button). + \o Therefore, the button is rendered using style sheets. + \o We haven't specified any values for + \l{Qt Style Sheets Reference#border-width-prop}{border-width} and + \l{Qt Style Sheets Reference#border-style-prop}{border-style}, so by default we obtain + a 0-pixel wide border of style \c none. + \endlist + + Let's improve the situation by specifying a border: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 97 + + \image stylesheet-redbutton2.png A red button with a beige border + + Things look already a lot better. But the button looks a bit + cramped. Let's specify some spacing between the border and the + text using the \l{Qt Style Sheets Reference#padding-prop}{padding}. Additionally, we will + enforce a minimum width, round the corners, and specify a larger + font to make the button look nicer: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 98 + + \image stylesheet-redbutton3.png A red button with a round beige border and big, bold text + + The only issue remaining is that the button doesn't react when we + press it. We can fix this by specifying a slightly different + background color and use a different border style. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 99 + + \section2 Customizing the QPushButton's Menu Indicator Sub-Control + + Subcontrols give access to the sub-elements of a widget. For + example, a QPushButton associated with a menu (using + QPushButton::setMenu()) has a menu indicator. Let's customize + the menu indicator for the red push button: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 100 + + By default, the menu indicator is located at the bottom-right + corner of the padding rectangle. We can change this by specifying + \l{Qt Style Sheets Reference#subcontrol-position-prop}{subcontrol-position} and + \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin} to anchor the + indicator differently. We can also use \l{Qt Style Sheets Reference#top-prop}{top} and + \l{Qt Style Sheets Reference#left-prop}{left} to move the indicator by a few pixels. For + example: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 101 + + This positions the \c myindicator.png to the center right of the + QPushButton's \l{Qt Style Sheets Reference#padding-prop}{padding} rectangle (see + \l{Qt Style Sheets Reference#subcontrol-origin-prop}{subcontrol-origin} for more + information). + + \section2 Complex Selector Example + + Since red seems to be our favorite color, let's make the text in + QLineEdit red by setting the following application-wide + stylesheet: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 102 + + However, we would like to give a visual indication that a + QLineEdit is read-only by making it appear gray: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 103 + + At some point, our design team comes with the requirement that + all \l{QLineEdit}s in the registration form (with the + \l{QObject::objectName}{object name} \c registrationDialog) to be + brown: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 104 + + A few UI design meetings later, we decide that all our + \l{QDialog}s should have brown colored \l{QLineEdit}s: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 105 + + Quiz: What happens if we have a read-only QLineEdit in a QDialog? + [Hint: The \l{The Style Sheet Syntax#Conflict Resolution}{Conflict Resolution} section above explains + what happens in cases like this.] + + \section1 Customizing specific widgets + + This section provides examples to customize specific widgets using Style Sheets. + + \section2 Customizing QAbstractScrollArea + + The background of any QAbstractScrollArea (Item views, QTextEdit + and QTextBrowser) can be set using the background properties. For example, + to set a background-image that scrolls with the scroll bar: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 106 + + If the background-image is to be fixed with the viewport: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 107 + + \section2 Customizing QCheckBox + + Styling of a QCheckBox is almost indentical to styling a QRadioButton. The + main difference is that a tristate QCheckBox has an indeterminate state. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 108 + + \section2 Customizing QComboBox + + We will look at an example where the drop down button of a QComboBox + appears "merged" with the combo box frame. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 109 + + The pop-up of the QComboBox is a QAbstractItemView and is styled using + the descendant selector: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 110 + + \section2 Customizing QDockWidget + + The title bar and the buttons of a QDockWidget can be customized as + follows: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 111 + + If one desires to move the dock widget buttons to the left, the following + style sheet can be used: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 112 + + \note To customize the separator (resize handle) of a QDockWidget, + use QMainWindow::separator. + + \section2 Customizing QFrame + + A QFrame is styled using the \l{The Box Model}. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 113 + + \section2 Customizing QGroupBox + + Let us look at an example that moves the QGroupBox's title to + the center. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 114 + + For a checkable QGroupBox, use the \{#indicator-sub}{::indicator} subcontrol + and style it exactly like a QCheckBox (i.e) + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 115 + + \section2 Customizing QHeaderView + + QHeaderView is customized as follows: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 116 + + \section2 Customizing QLineEdit + + The frame of a QLineEdit is styled using the \l{The Box Model}. To + create a line edit with rounded corners, we can set: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 117 + + The password character of line edits that have QLineEdit::Password + echo mode can be set using: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 118 + + The background of a read only QLineEdit can be modified as below: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 119 + + \section2 Customizing QListView + + The background color of alternating rows can be customized using the following + style sheet: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 120 + + To provide a special background when you hover over items, we can use the + \l{item-sub}{::item} subcontrol. For example, + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 121 + + \section2 Customizing QMainWindow + + The separator of a QMainWindow can be styled as follows: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 122 + + \section2 Customizing QMenu + + Individual items of a QMenu are styled using the 'item' subcontrol as + follows: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 123 + + For a more advanced customization, use a style sheet as follows: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 124 + + \section2 Customizing QMenuBar + + QMenuBar is styled as follows: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 125 + + \section2 Customizing QProgressBar + + The QProgressBar's \l{stylesheet-reference.html#border-prop}{border}, + \l{stylesheet-reference.html#chunk-sub}{chunk}, and + \l{stylesheet-reference.html#text-align-prop}{text-align} can be customized using + style sheets. However, if one property or sub-control is customized, + all the other properties or sub-controls must be customized as well. + + \image progressBar-stylesheet.png + + For example, we change the \l{stylesheet-reference.html#border-prop} + {border} to grey and the \l{stylesheet-reference.html#chunk-sub}{chunk} + to cerulean. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 126 + + This leaves the \l{stylesheet-reference.html#text-align-prop} + {text-align}, which we customize by positioning the text in the center of + the progress bar. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 127 + + A \l{stylesheet-reference.html#margin-prop}{margin} can be included to + obtain more visible chunks. + + \image progressBar2-stylesheet.png + + In the screenshot above, we use a + \l{stylesheet-reference.html#margin-prop}{margin} of 0.5 pixels. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 128 + + \section2 Customizing QPushButton + + A QPushButton is styled as follows: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 129 + + For a QPushButton with a menu, use the + \l{Qt Style Sheets Reference#menu-indicator-sub}{::menu-indicator} + subcontrol. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 130 + + Checkable QPushButton have the \l{Qt Style Sheets Reference#checked-ps} + {:checked} pseudo state set. + + \section2 Customizing QRadioButton + + The indicator of a QRadioButton can be changed using: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 131 + + \section2 Customizing QScrollBar + + The QScrollBar can be styled using its subcontrols like + \l{stylesheet-reference.html#handle-sub}{handle}, + \l{stylesheet-reference.html#add-line-sub}{add-line}, + \l{stylesheet-reference.html#sub-line-sub}{sub-line}, and so on. Note that + if one property or sub-control is customized, all the other properties or + sub-controls must be customized as well. + + \image stylesheet-scrollbar1.png + + The scroll bar above has been styled in aquamarine with a solid grey + border. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 132 + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 133 + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 134 + + The \l{stylesheet-reference.html#left-arrow-sub}{left-arrow} and + \l{stylesheet-reference.html#right-arrow-sub}{right-arrow} have a solid grey + border with a white background. As an alternative, you could also embed the + image of an arrow. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 135 + + If you want the scroll buttons of the scroll bar to be placed together + (instead of the edges) like on Mac OS X, you can use the following + stylesheet: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 136 + + The scroll bar using the above stylesheet looks like this: + \image stylesheet-scrollbar2.png + + + To customize a vertical scroll bar use a style sheet similar to the following: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 137 + + \section2 Customizing QSizeGrip + + QSizeGrip is usually styled by just setting an image. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 138 + + \section2 Customizing QSlider + + You can style horizontal slider as below: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 139 + + If you want to change the color of the slider parts before and after the handle, you can use the add-page + and sub-page subcontrols. For example, for a vertical slider: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 140 + + \section2 Customizing QSpinBox + + QSpinBox can be completely customized as below (the style sheet has commentary inline): + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 141 + + + \section2 Customizing QSplitter + + A QSplitter derives from a QFrame and hence can be styled like a QFrame. + The grip or the handle is customized using the + \l{Qt Style Sheets Reference#handle-sub}{::handle} subcontrol. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 142 + + \section2 Customizing QStatusBar + + We can provide a background for the status bar and a border for items + inside the status bar as follows: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 143 + + Note that widgets that have been added to the QStatusBar can be styled + using the descendant declaration (i.e) + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 144 + + \section2 Customizing QTabWidget and QTabBar + + \image tabWidget-stylesheet1.png + + For the screenshot above, we need a stylesheet as follows: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 145 + + Often we require the tabs to overlap to look like below: + \image tabWidget-stylesheet2.png + + For a tab widget that looks like above, we make use of + \l{http://www.communitymx.com/content/article.cfm?cid=B0029} + {negative margins}. The resulting stylesheet looks like this: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 146 + + To move the tab bar to the center (as below), we require the following stylesheet: + \image tabWidget-stylesheet3.png + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 147 + + The tear indicator and the scroll buttons can be further customized as follows: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 148 + + Sine Qt 4.6 the close button can be customized as follow: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 159 + + \section2 Customizing QTableView + + Suppose we'd like our selected item in QTableView to have bubblegum pink + fade to white as its background. + + \image tableWidget-stylesheet.png + + This is possible with the + \l{stylesheet-reference.html#selection-background-color-prop} + {selection-background-color} property and the syntax required is: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 149 + + The corner widget can be customized using the following style sheet + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 150 + + \section2 Customizing QToolBar + + The background and the handle of a QToolBar is customized as below: + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 151 + + \section2 Customizing QToolBox + + The tabs of the QToolBox are customized using the 'tab' subcontrol. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 152 + + \section2 Customizing QToolButton + + There are three types of QToolButtons. + \list + \i The QToolButton has no menu. In this case, the QToolButton is styled + exactly like QPushButton. See + \l{#Customizing QPushButton}{Customizing QPushButton} for an + example. + + \i The QToolButton has a menu and has the QToolButton::popupMode set to + QToolButton::DelayedPopup or QToolButton::InstantPopup. In this case, + the QToolButton is styled exactly like a QPushButton with a menu. + See \l{#Customizing QPushButton}{Customizing QPushButton} for an + example of the usage of the menu-indicator pseudo state. + + \i The QToolButton has its QToolButton::popupMode set to + QToolButton::MenuButtonPopup. In this case, we style it as follows: + \endlist + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 153 + + + \section2 Customizing QToolTip + + QToolTip is customized exactly like a QLabel. In addition, for platforms + that support it, the opacity property may be set to adjust the opacity. + + For example, + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 154 + + \section2 Customizing QTreeView + + The background color of alternating rows can be customized using the following + style sheet: + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 155 + + To provide a special background when you hover over items, we can use the + \l{item-sub}{::item} subcontrol. For example, + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 156 + + The branches of a QTreeView are styled using the + \l{Qt Style Sheets Reference#branch-sub}{::branch} subcontrol. The + following stylesheet color codes the various states when drawing + a branch. + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 157 + + Colorful, though it is, a more useful example can be made using the + following images: + + \table + \row + \o \inlineimage stylesheet-vline.png + \o \inlineimage stylesheet-branch-more.png + \o \inlineimage stylesheet-branch-end.png + \o \inlineimage stylesheet-branch-closed.png + \o \inlineimage stylesheet-branch-open.png + \row + \o vline.png + \o branch-more.png + \o branch-end.png + \o branch-closed.png + \o branch-open.png + \endtable + + \snippet doc/src/snippets/code/doc_src_stylesheet.qdoc 158 + + The resulting tree view looks like this: + + \image stylesheet-treeview.png + + \sa {Style Sheet Example}, {Supported HTML Subset}, QStyle + + + \section1 Common mistakes + + This section lists some common mistakes when using stylesheets. + + \section2 QPushButton and images + + When styling a QPushButton, it is often desirable to use an image as the + button graphic. It is common to try the + \l{Qt Style Sheets Reference#background-image-prop}{background-image} + property, + but this has a number of drawbacks: For instance, the background will + often appear hidden behind the button decoration, because it is not + considered a background. In addition, if the button is resized, the + entire background will be stretched or tiled, which does not + always look good. + + It is better to use the + \l{Qt Style Sheets Reference#border-image-prop}{border-image} + property, as it will always display the image, + regardless of the background (you can combine it with a background if it + has alpha values in it), and it has special settings to deal with button + resizing. + + Consider the following snippet: + + \snippet doc/src/snippets/stylesheet/common-mistakes.cpp 1 + + This will produce a button looking like this: + + \image stylesheet-border-image-normal.png + + The numbers after the url gives the top, right, bottom and left number of + pixels, respectively. These numbers correspond to the border and should not + stretch when the size changes. + Whenever you resize the button, the middle part of the image will stretch + in both directions, while the pixels specified in the stylesheet + will not. This makes the borders of the button look more natural, like + this: + + \table + \row + \o \inlineimage stylesheet-border-image-stretched.png + \row + \o With borders + \endtable + + \table + \row + \o \inlineimage stylesheet-border-image-wrong.png + \row + \o Without borders + \endtable + + */ |