173 lines
6.0 KiB
Plaintext
173 lines
6.0 KiB
Plaintext
/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the documentation of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:FDL$
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** Commercial Usage
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in a
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** written agreement between you and Nokia.
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**
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** GNU Free Documentation License
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** Alternatively, this file may be used under the terms of the GNU Free
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** Documentation License version 1.3 as published by the Free Software
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** Foundation and appearing in the file included in the packaging of this
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** file.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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/*!
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\class QDesignerContainerExtension
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\brief The QDesignerContainerExtension class allows you to add pages to
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a custom multi-page container in Qt Designer's workspace.
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\inmodule QtDesigner
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QDesignerContainerExtension provide an interface for creating
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custom container extensions. A container extension consists of a
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collection of functions that \QD needs to manage a multi-page
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container plugin, and a list of the container's pages.
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\image containerextension-example.png
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\warning This is \e not an extension for container plugins in
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general, only custom \e multi-page containers.
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To create a container extension, your extension class must inherit
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from both QObject and QDesignerContainerExtension. For example:
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\snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 6
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Since we are implementing an interface, we must ensure that it's
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made known to the meta object system using the Q_INTERFACES()
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macro. This enables \QD to use the qobject_cast() function to
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query for supported interfaces using nothing but a QObject
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pointer.
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You must reimplement several functions to enable \QD to manage a
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custom multi-page container widget: \QD uses count() to keep track
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of the number pages in your container, widget() to return the page
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at a given index in the list of the container's pages, and
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currentIndex() to return the list index of the selected page. \QD
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uses the addWidget() function to add a given page to the
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container, expecting it to be appended to the list of pages, while
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it expects the insertWidget() function to add a given page to the
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container by inserting it at a given index.
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In \QD the extensions are not created until they are
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required. For that reason you must also create a
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QExtensionFactory, i.e a class that is able to make an instance of
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your extension, and register it using \QD's \l
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{QExtensionManager}{extension manager}.
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When a container extension is required, \QD's \l
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{QExtensionManager}{extension manager} will run through all its
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registered factories calling QExtensionFactory::createExtension()
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for each until the first one that is able to create a container
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extension, is found. This factory will then create the extension
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for the plugin.
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There are four available types of extensions in \QD:
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QDesignerContainerExtension , QDesignerMemberSheetExtension,
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QDesignerPropertySheetExtension and QDesignerTaskMenuExtension.
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\QD's behavior is the same whether the requested extension is
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associated with a multi page container, a member sheet, a property
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sheet or a task menu.
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The QExtensionFactory class provides a standard extension factory,
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and can also be used as an interface for custom extension
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factories. You can either create a new QExtensionFactory and
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reimplement the QExtensionFactory::createExtension() function. For
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example:
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\snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 7
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Or you can use an existing factory, expanding the
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QExtensionFactory::createExtension() function to make the factory
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able to create a container extension as well. For example:
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\snippet doc/src/snippets/code/doc_src_qtdesigner.qdoc 8
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For a complete example using the QDesignerContainerExtension
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class, see the \l {designer/containerextension}{Container
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Extension example}. The example shows how to create a custom
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multi-page plugin for \QD.
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\sa QExtensionFactory, QExtensionManager, {Creating Custom Widget
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Extensions}
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*/
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/*!
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\fn QDesignerContainerExtension::~QDesignerContainerExtension()
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Destroys the extension.
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*/
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/*!
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\fn int QDesignerContainerExtension::count() const
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Returns the number of pages in the container.
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*/
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/*!
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\fn QWidget *QDesignerContainerExtension::widget(int index) const
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Returns the page at the given \a index in the extension's list of
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pages.
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\sa addWidget(), insertWidget()
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*/
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/*!
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\fn int QDesignerContainerExtension::currentIndex() const
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Returns the index of the currently selected page in the
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container.
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\sa setCurrentIndex()
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*/
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/*!
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\fn void QDesignerContainerExtension::setCurrentIndex(int index)
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Sets the currently selected page in the container to be the
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page at the given \a index in the extension's list of pages.
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\sa currentIndex()
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*/
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/*!
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\fn void QDesignerContainerExtension::addWidget(QWidget *page)
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Adds the given \a page to the container by appending it to the
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extension's list of pages.
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\sa insertWidget(), remove(), widget()
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*/
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/*!
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\fn void QDesignerContainerExtension::insertWidget(int index, QWidget *page)
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Adds the given \a page to the container by inserting it at the
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given \a index in the extension's list of pages.
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\sa addWidget(), remove(), widget()
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*/
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/*!
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\fn void QDesignerContainerExtension::remove(int index)
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Removes the page at the given \a index from the extension's list
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of pages.
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\sa addWidget(), insertWidget()
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*/
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