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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** 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 Free Documentation License
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of this
** file.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page widgets-and-layouts.html
\title Widgets and Layouts
\ingroup qt-gui-concepts
\brief The primary elements for designing user interfaces in Qt.
\section1 Widgets
Widgets are the primary elements for creating user interfaces in Qt.
\l{The Widget Classes}{Widgets} can display data and status information,
receive user input, and provide a container for other widgets that
should be grouped together. A widget that is not embedded in a
parent widget is called a \l{Window and Dialog Widgets} {window}.
\image parent-child-widgets.png A parent widget containing various child widgets.
The QWidget class provides the basic capability to render to the
screen, and to handle user input events. All UI elements that Qt
provides are either subclasses of QWidget, or are used in connection
with a QWidget subclass. Creating custom widgets is done by
subclassing QWidget or a suitable subclass and reimplementing the
virtual event handlers.
\section1 Layouts
\l{Layout Management}{Layouts} are an elegant and flexible way to
automatically arrange child widgets within their container. Each
widget reports its size requirements to the layout through the
\l{QWidget::}{sizeHint} and \l{QWidget::}{sizePolicy} properties,
and the layout distributes the available space accordingly.
\table
\row
\o \image qgridlayout-with-5-children.png
\o \image qformlayout-with-6-children.png
\endtable
\l{Qt Designer Manual}{\QD} is a powerful tool for interactively creating and
arranging widgets in layouts.
\section1 Widget Styles
\l{Styles and Style Aware Widgets}{Styles} draw on behalf of
widgets and encapsulate the look and feel of a GUI. Qt's built-in
widgets use the QStyle class to perform nearly all of their drawing,
ensuring that they look exactly like the equivalent native widgets.
\table
\row
\o \image windowsxp-tabwidget.png
\o \image plastique-tabwidget.png
\o \image macintosh-tabwidget.png
\endtable
\l{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.
\section1 The Widget Classes
The following sections list the widget classes. See the \l{Qt Widget
Gallery} for some examples.
\section2 Basic Widgets
These basic widgets (controls), e.g. buttons, comboboxes and
scroll bars, are designed for direct use.
\table
\row
\o \image windows-label.png
\o \image windowsvista-pushbutton.png
\o \image gtk-progressbar.png
\row
\o \image plastique-combobox.png
\o \image macintosh-radiobutton.png
\o \image cde-lineedit.png
\endtable
\annotatedlist basicwidgets
\section2 Advanced Widgets
Advanced GUI widgets, e.g. tab widgets and progress bars, provide
more complex user interface controls.
\table
\row
\o \image windowsxp-treeview.png
\o \image gtk-calendarwidget.png
\o \image qundoview.png
\endtable
\annotatedlist advanced
\table
\row
\o \image windowsvista-tabwidget.png
\o \image macintosh-groupbox.png
\endtable
\section2 Organizer Widgets
Classes like splitters, tab bars, button groups, etc are used for
organizing and grouping GUI primitives into more complex
applications and dialogs.
\annotatedlist organizers
\section2 Abstract Widget Classes
The abstract widget classes are base classes. They are not usable as
standalone classes but provide functionality when they are subclassed.
\annotatedlist abstractwidgets
*/
/*!
\group advanced
\title Advanced Widgets
*/
/*!
\group abstractwidgets
\title Abstract Widget Classes
*/
/*!
\group basicwidgets
\title Basic Widgets
*/
/*!
\group organizers
\title Organizers
*/
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