/**************************************************************************** ** ** Copyright (C) 2010 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. ** $QT_END_LICENSE$ ** ****************************************************************************/ /*! \class QDesignerPropertySheetExtension \brief The QDesignerPropertySheetExtension class allows you to manipulate a widget's properties which is displayed in Qt Designer's property editor. \sa QDesignerDynamicPropertySheetExtension \inmodule QtDesigner QDesignerPropertySheetExtension provides a collection of functions that are typically used to query a widget's properties, and to manipulate the properties' appearance in the property editor. For example: \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 15 Note that if you change the value of a property using the QDesignerPropertySheetExtension::setProperty() function, the undo stack is not updated. To ensure that a property's value can be reverted using the undo stack, you must use the QDesignerFormWindowCursorInterface::setProperty() function, or its buddy \l {QDesignerFormWindowCursorInterface::setWidgetProperty()}{setWidgetProperty()}, instead. When implementing a custom widget plugin, a pointer to \QD's current QDesignerFormEditorInterface object (\c formEditor in the example above) is provided by the QDesignerCustomWidgetInterface::initialize() function's parameter. The property sheet, or any other extension, can be retrieved by querying \QD's extension manager using the qt_extension() function. When you want to release the extension, you only need to delete the pointer. All widgets have a default property sheet which populates \QD's property editor with the widget's properties (i.e the ones defined with the Q_PROPERTY() macro). But QDesignerPropertySheetExtension also provides an interface for creating custom property sheet extensions. \warning \QD uses the QDesignerPropertySheetExtension to feed its property editor. Whenever a widget is selected in its workspace, \QD will query for the widget's property sheet extension. If the selected widget has an implemented property sheet extension, this extension will override the default property sheet. To create a property sheet extension, your extension class must inherit from both QObject and QDesignerPropertySheetExtension. Then, since we are implementing an interface, we must ensure that it's made known to the meta object system using the Q_INTERFACES() macro: \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 16 This enables \QD to use qobject_cast() to query for supported interfaces using nothing but a QObject pointer. In \QD the extensions are not created until they are required. For that reason, when implementing a property sheet extension, you must also create a QExtensionFactory, i.e a class that is able to make an instance of your extension, and register it using \QD's \l {QExtensionManager}{extension manager}. When a property sheet extension is required, \QD's \l {QExtensionManager}{extension manager} will run through all its registered factories calling QExtensionFactory::createExtension() for each until the first one that is able to create a property sheet extension for the selected widget, is found. This factory will then make an instance of the extension. If no such factory can be found, \QD will use the default property sheet. There are four available types of extensions in \QD: QDesignerContainerExtension, QDesignerMemberSheetExtension, QDesignerPropertySheetExtension and QDesignerTaskMenuExtension. Qt Designer's behavior is the same whether the requested extension is associated with a multi page container, a member sheet, a property sheet or a task menu. The QExtensionFactory class provides a standard extension factory, and can also be used as an interface for custom extension factories. You can either create a new QExtensionFactory and reimplement the QExtensionFactory::createExtension() function. For example: \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 17 Or you can use an existing factory, expanding the QExtensionFactory::createExtension() function to make the factory able to create a property sheet extension extension as well. For example: \snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 18 For a complete example using an extension class, see the \l {designer/taskmenuextension}{Task Menu Extension example}. The example shows how to create a custom widget plugin for Qt Designer, and how to to use the QDesignerTaskMenuExtension class to add custom items to \QD's task menu. \sa QExtensionFactory, QExtensionManager, {Creating Custom Widget Extensions} */ /*! \fn QDesignerPropertySheetExtension::~QDesignerPropertySheetExtension() Destroys the property sheet extension. */ /*! \fn int QDesignerPropertySheetExtension::count() const Returns the selected widget's number of properties. */ /*! \fn int QDesignerPropertySheetExtension::indexOf(const QString &name) const Returns the index for a given property \a name. \sa propertyName() */ /*! \fn QString QDesignerPropertySheetExtension::propertyName(int index) const Returns the name of the property at the given \a index. \sa indexOf() */ /*! \fn QString QDesignerPropertySheetExtension::propertyGroup(int index) const Returns the property group for the property at the given \a index. \QD's property editor supports property groups, i.e. sections of related properties. A property can be related to a group using the setPropertyGroup() function. The default group of any property is the name of the class that defines it. For example, the QObject::objectName property appears within the QObject property group. \sa indexOf(), setPropertyGroup() */ /*! \fn void QDesignerPropertySheetExtension::setPropertyGroup(int index, const QString &group) Sets the property group for the property at the given \a index to \a group. Relating a property to a group makes it appear within that group's section in the property editor. The default property group of any property is the name of the class that defines it. For example, the QObject::objectName property appears within the QObject property group. \sa indexOf(), property(), propertyGroup() */ /*! \fn bool QDesignerPropertySheetExtension::hasReset(int index) const Returns true if the property at the given \a index has a reset button in \QD's property editor, otherwise false. \sa indexOf(), reset() */ /*! \fn bool QDesignerPropertySheetExtension::reset(int index) Resets the value of the property at the given \a index, to the default value. Returns true if a default value could be found, otherwise false. \sa indexOf(), hasReset(), isChanged() */ /*! \fn bool QDesignerPropertySheetExtension::isVisible(int index) const Returns true if the property at the given \a index is visible in \QD's property editor, otherwise false. \sa indexOf(), setVisible() */ /*! \fn void QDesignerPropertySheetExtension::setVisible(int index, bool visible) If \a visible is true, the property at the given \a index is visible in \QD's property editor; otherwise the property is hidden. \sa indexOf(), isVisible() */ /*! \fn bool QDesignerPropertySheetExtension::isAttribute(int index) const Returns true if the property at the given \a index is an attribute, which will be \e excluded from the UI file, otherwise false. \sa indexOf(), setAttribute() */ /*! \fn void QDesignerPropertySheetExtension::setAttribute(int index, bool attribute) If \a attribute is true, the property at the given \a index is made an attribute which will be \e excluded from the UI file; otherwise it will be included. \sa indexOf(), isAttribute() */ /*! \fn QVariant QDesignerPropertySheetExtension::property(int index) const Returns the value of the property at the given \a index. \sa indexOf(), setProperty(), propertyGroup() */ /*! \fn void QDesignerPropertySheetExtension::setProperty(int index, const QVariant &value) Sets the \a value of the property at the given \a index. \warning If you change the value of a property using this function, the undo stack is not updated. To ensure that a property's value can be reverted using the undo stack, you must use the QDesignerFormWindowCursorInterface::setProperty() function, or its buddy \l {QDesignerFormWindowCursorInterface::setWidgetProperty()}{setWidgetProperty()}, instead. \sa indexOf(), property(), propertyGroup() */ /*! \fn bool QDesignerPropertySheetExtension::isChanged(int index) const Returns true if the value of the property at the given \a index differs from the property's default value, otherwise false. \sa indexOf(), setChanged(), reset() */ /*! \fn void QDesignerPropertySheetExtension::setChanged(int index, bool changed) Sets whether the property at the given \a index is different from its default value, or not, depending on the \a changed parameter. \sa indexOf(), isChanged() */