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| == Abstract ==
| | {{Note|This is now located at https://community.kde.org/Get_Involved/development/Tutorials/Writing_Qt_Designer_Plugins}} |
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| This tutorial shows how to add support for custom GUI elements to Qt Designer. It starts by showing how to add a simple custom widget.
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| == Creating a simple plugin for a custom widget ==
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| We assume you have written a nice widget which you also want to be able to use in Qt Designer and the ui files. For this to achieve you have to write a plugin module for Qt Designer. It consists of just a single object of a class you have to write.
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| === The interface to the plugin ===
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| The class, a factory, needs to be subclassed from {{qt|QObject}} and to implement the interface {{qt|QDesignerCustomWidgetInterface}}, as given by example for the widget MyWidget in the "mywidgetdesignerfactory.h":
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| <code cppqt n>
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| #ifndef MYWIDGETDESIGNERFACTORY_H
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| #define MYWIDGETDESIGNERFACTORY_H
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| // Qt
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| #include <QtDesigner/QDesignerCustomWidgetInterface>
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| #include <QtCore/QObject>
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| class MyWidgetDesignerFactory : public QObject, public QDesignerCustomWidgetInterface
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| {
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| Q_OBJECT
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| Q_INTERFACES( QDesignerCustomWidgetInterface )
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| public:
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| explicit MyWidgetDesignerFactor( QObject* parent = 0 );
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| public: // QDesignerCustomWidgetInterface API
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| virtual QWidget* createWidget( QWidget* parent );
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| virtual QString group() const;
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| virtual QIcon icon() const;
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| virtual QString includeFile() const;
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| virtual bool isContainer() const;
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| virtual QString name() const;
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| virtual QString toolTip() const;
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| virtual QString whatsThis() const;
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| };
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| #endif
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| </code>
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| === Creating the data as needed by the interface ===
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| The definition of the methods is done as shown in the file "mywidgetdesignerfactory.cpp":
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| <code cppqt n>
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| #include "mywidgetdesignerfactory.h"
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| // my lib | |
| #include <mywidget.h>
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| // Qt
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| #include <QtCore/QtPlugin>
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| MyWidgetDesignerFactory::MyWidgetDesignerFactory( QObject* parent )
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| : QObject( parent )
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| {
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| }
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| QWidget* MyWidgetDesignerFactory::createWidget( QWidget* parent )
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| {
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| MyNamespace::MyWidget* widget = new MyNamespace::MyWidget( parent );
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| // init with some example data useful in the preview inside Qt Designer
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| // this data will be only used there, not in the resulting view in the program.
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| return widget;
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| }
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| QString MyWidgetDesignerFactory::group() const
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| {
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| return QString::fromLatin1("Some group (KDE)");
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| }
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| QIcon MyWidgetDesignerFactory::icon() const
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| {
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| return QIcon();
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| }
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| QString MyWidgetDesignerFactory::includeFile() const
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| {
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| return QString::fromLatin1("neededincludepathprefix/mywidget.h");
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| }
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| QString MyWidgetDesignerFactory::toolTip() const
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| {
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| return QString::fromLatin1("Useful Widget of Mine");
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| }
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| QString MyWidgetDesignerFactory::whatsThis() const
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| {
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| return QString::fromLatin1("Some description of my widget.");
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| }
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| bool MyWidgetDesignerFactory::isContainer() const
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| {
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| return false;
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| }
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| QString MyWidgetDesignerFactory::name() const
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| {
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| return QString::fromLatin1("MyNamespace::MyWidget");
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| }
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| // export macro, takes the name of the plugin module and the class name | |
| Q_EXPORT_PLUGIN2( mydesignerplugin, MyWidgetDesignerFactory )
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| </code>
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| === Adding to the Buildsystem ===
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| After you created the two files above you need to tell the buildsystem how to build the Qt Designer plugin from them and where to install it. This needs a CMakeLists.txt file in the same directory with such content:
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| set( mydesignerplugin_SRCS
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| mywidgetdesignerfactory.cpp
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| )
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| # the name of the plugin module is the same name as used in the macro Q_EXPORT_PLUGIN2 in the mywidgetdesignerfactory.cpp file
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| kde4_add_plugin( mydesignerplugin ${mydesignerplugin_SRCS} )
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| target_link_libraries( mydesignerplugin
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| mylib
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| # other needed libs
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| )
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| install( TARGETS mydesignerplugin DESTINATION ${PLUGIN_INSTALL_DIR}/plugins/designer )
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| === Finding your widget in Qt Designer ===
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| If you successfully compiled and installed your plugin, (re-)start Qt Designer and have a look in the Widgetbox (on the left side by default). If everything worked perfectly you will see a new entry "MyNamespace::MyWidget" (as defined by <tt>MyWidgetDesignerFactory::name()</tt>) in the group "Some group (KDE)" (as defined by <tt>MyWidgetDesignerFactory::group()</tt>). Now drag and drop the entry to the currently edited view in Qt Designer, and voilà, your widget should be added to that view.
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