296 lines
9.7 KiB
Plaintext
296 lines
9.7 KiB
Plaintext
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/****************************************************************************
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**
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** Copyright (C) 2011 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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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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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 QDesignerCustomWidgetInterface
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\brief The QDesignerCustomWidgetInterface class enables Qt Designer
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to access and construct custom widgets.
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\inmodule QtDesigner
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QDesignerCustomWidgetInterface provides a custom widget with an
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interface. The class contains a set of functions that must be subclassed
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to return basic information about the widget, such as its class name and
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the name of its header file. Other functions must be implemented to
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initialize the plugin when it is loaded, and to construct instances of
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the custom widget for \QD to use.
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When implementing a custom widget you must subclass
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QDesignerCustomWidgetInterface to expose your widget to \QD. For
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example, this is the declaration for the plugin used in the
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\l{Custom Widget Plugin Example}{Custom Widget Plugin example} that
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enables an analog clock custom widget to be used by \QD:
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\snippet examples/designer/customwidgetplugin/customwidgetplugin.h 0
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Note that the only part of the class definition that is specific
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to this particular custom widget is the class name. In addition,
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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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After \QD loads a custom widget plugin, it calls the interface's
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initialize() function to enable it to set up any resources that it
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may need. This function is called with a QDesignerFormEditorInterface
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parameter that provides the plugin with a gateway to all of \QD's API.
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\QD constructs instances of the custom widget by calling the plugin's
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createWidget() function with a suitable parent widget. Plugins must
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construct and return an instance of a custom widget with the specified
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parent widget.
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In the implementation of the class you must remember to export
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your custom widget plugin to \QD using the Q_EXPORT_PLUGIN2()
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macro. For example, if a library called \c libcustomwidgetplugin.so
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(on Unix) or \c libcustomwidget.dll (on Windows) contains a widget
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class called \c MyCustomWidget, we can export it by adding the
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following line to the file containing the plugin implementation:
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\snippet doc/src/snippets/code/doc_src_qtdesigner.cpp 14
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This macro ensures that \QD can access and construct the custom widget.
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Without this macro, there is no way for \QD to use it.
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When implementing a custom widget plugin, you build it as a
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separate library. If you want to include several custom widget
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plugins in the same library, you must in addition subclass
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QDesignerCustomWidgetCollectionInterface.
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\warning If your custom widget plugin contains QVariant
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properties, be aware that only the following \l
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{QVariant::Type}{types} are supported:
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\list
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\o QVariant::ByteArray
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\o QVariant::Bool
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\o QVariant::Color
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\o QVariant::Cursor
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\o QVariant::Date
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\o QVariant::DateTime
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\o QVariant::Double
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\o QVariant::Int
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\o QVariant::Point
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\o QVariant::Rect
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\o QVariant::Size
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\o QVariant::SizePolicy
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\o QVariant::String
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\o QVariant::Time
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\o QVariant::UInt
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\endlist
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For a complete example using the QDesignerCustomWidgetInterface
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class, see the \l {designer/customwidgetplugin}{Custom Widget
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Example}. The example shows how to create a custom widget plugin
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for \QD.
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\sa QDesignerCustomWidgetCollectionInterface {Creating Custom
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Widgets for Qt Designer}
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*/
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/*!
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\fn QDesignerCustomWidgetInterface::~QDesignerCustomWidgetInterface()
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Destroys the custom widget interface.
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*/
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/*!
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\fn QString QDesignerCustomWidgetInterface::name() const
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Returns the class name of the custom widget supplied by the interface.
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The name returned \e must be identical to the class name used for the
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custom widget.
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*/
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/*!
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\fn QString QDesignerCustomWidgetInterface::group() const
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Returns the name of the group to which the custom widget belongs.
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*/
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/*!
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\fn QString QDesignerCustomWidgetInterface::toolTip() const
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Returns a short description of the widget that can be used by \QD
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in a tool tip.
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*/
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/*!
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\fn QString QDesignerCustomWidgetInterface::whatsThis() const
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Returns a description of the widget that can be used by \QD in
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"What's This?" help for the widget.
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*/
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/*!
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\fn QString QDesignerCustomWidgetInterface::includeFile() const
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Returns the path to the include file that \l uic uses when
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creating code for the custom widget.
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*/
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/*!
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\fn QIcon QDesignerCustomWidgetInterface::icon() const
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Returns the icon used to represent the custom widget in \QD's
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widget box.
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*/
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/*!
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\fn bool QDesignerCustomWidgetInterface::isContainer() const
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Returns true if the custom widget is intended to be used as a
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container; otherwise returns false.
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Most custom widgets are not used to hold other widgets, so their
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implementations of this function will return false, but custom
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containers will return true to ensure that they behave correctly
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in \QD.
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*/
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/*!
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\fn QWidget *QDesignerCustomWidgetInterface::createWidget(QWidget *parent)
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Returns a new instance of the custom widget, with the given \a
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parent.
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*/
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/*!
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\fn bool QDesignerCustomWidgetInterface::isInitialized() const
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Returns true if the widget has been initialized; otherwise returns
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false.
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\sa initialize()
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*/
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/*!
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\fn void QDesignerCustomWidgetInterface::initialize(QDesignerFormEditorInterface *formEditor)
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Initializes the widget for use with the specified \a formEditor
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interface.
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\sa isInitialized()
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*/
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/*!
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\fn QString QDesignerCustomWidgetInterface::domXml() const
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Returns the XML that is used to describe the custom widget's
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properties to \QD.
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*/
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/*!
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\fn QString QDesignerCustomWidgetInterface::codeTemplate() const
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This function is reserved for future use by \QD.
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\omit
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Returns the code template that \QD includes in forms that contain
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the custom widget when they are saved.
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\endomit
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*/
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/*!
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\macro QDESIGNER_WIDGET_EXPORT
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\relates QDesignerCustomWidgetInterface
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\since 4.1
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This macro is used when defining custom widgets to ensure that they are
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correctly exported from plugins for use with \QD.
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On some platforms, the symbols required by \QD to create new widgets
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are removed from plugins by the build system, making them unusable.
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Using this macro ensures that the symbols are retained on those platforms,
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and has no side effects on other platforms.
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For example, the \l{designer/worldtimeclockplugin}{World Time Clock Plugin}
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example exports a custom widget class with the following declaration:
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\snippet examples/designer/worldtimeclockplugin/worldtimeclock.h 0
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\dots
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\snippet examples/designer/worldtimeclockplugin/worldtimeclock.h 2
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\sa {Creating Custom Widgets for Qt Designer}
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*/
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/*!
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\class QDesignerCustomWidgetCollectionInterface
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\brief The QDesignerCustomWidgetCollectionInterface class allows
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you to include several custom widgets in one single library.
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\inmodule QtDesigner
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When implementing a custom widget plugin, you build it as a
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separate library. If you want to include several custom widget
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plugins in the same library, you must in addition subclass
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QDesignerCustomWidgetCollectionInterface.
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QDesignerCustomWidgetCollectionInterface contains one single
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function returning a list of the collection's
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QDesignerCustomWidgetInterface objects. For example, if you have
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several custom widgets \c CustomWidgetOne, \c CustomWidgetTwo and
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\c CustomWidgetThree, the class definition may look like this:
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\snippet doc/src/snippets/code/doc_src_qtdesigner.cpp 12
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In the class constructor you add the interfaces to your custom
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widgets to the list which you return in the customWidgets()
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function:
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\snippet doc/src/snippets/code/doc_src_qtdesigner.cpp 13
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Note that instead of exporting each custom widget plugin using the
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Q_EXPORT_PLUGIN2() macro, you export the entire collection. The
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Q_EXPORT_PLUGIN2() macro ensures that \QD can access and construct
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the custom widgets. Without this macro, there is no way for \QD to
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use them.
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\sa QDesignerCustomWidgetInterface, {Creating Custom Widgets for
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Qt Designer}
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*/
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/*!
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\fn QDesignerCustomWidgetCollectionInterface::~QDesignerCustomWidgetCollectionInterface() {
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Destroys the custom widget collection interface.
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*/
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/*!
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\fn QList<QDesignerCustomWidgetInterface*> QDesignerCustomWidgetCollectionInterface::customWidgets() const
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Returns a list of interfaces to the collection's custom widgets.
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*/
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