plugin.cpp Example File
demos/arthurplugin/plugin.cpp

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 #include <QtDesigner/QDesignerContainerExtension>
 #include <QtDesigner/QDesignerCustomWidgetInterface>

 #include <QtCore/qplugin.h>
 #include <QtGui/QIcon>
 #include <QtGui/QPixmap>

 #include "xform.h"
 #include "pathdeform.h"
 #include "gradients.h"
 #include "pathstroke.h"
 #include "hoverpoints.h"
 #include "composition.h"

 QT_FORWARD_DECLARE_CLASS(QDesignerFormEditorInterface)

 // Specify "text" to be a singleline property (no richtext)
 static inline QString textSingleLinePropertyDeclaration(const QString &className)
 {
     QString rc = QLatin1String(
             "<customwidgets>\n"
             "  <customwidget>\n"
             "    <class>");
     rc += className;
     rc += QLatin1String("</class>\n"
             "    <propertyspecifications>\n"
             "      <stringpropertyspecification name=\"text\" type=\"singleline\"/>\n"
             "    </propertyspecifications>\n"
             "  </customwidget>\n"
             "</customwidgets>\n");
     return rc;
 }

 // Plain XML for a custom widget
 static inline QString customWidgetDomXml(const QString &className,
                                          const QString &customSection = QString())
 {
     QString rc = QLatin1String("<ui language=\"c++\"><widget class=\"");
     rc += className;
     rc += QLatin1String("\" name=\"");
     QString objectName = className;
     objectName[0] = objectName.at(0).toLower();
     rc += objectName;
     rc += QLatin1String("\"/>");
     rc += customSection;
     rc += QLatin1String("</ui>");
     return rc;
 }

 class PathDeformRendererEx : public PathDeformRenderer
 {
     Q_OBJECT
 public:
     PathDeformRendererEx(QWidget *parent) : PathDeformRenderer(parent) { }
     QSize sizeHint() const { return QSize(300, 200); }
 };

 class DemoPlugin : public QDesignerCustomWidgetInterface
 {
     Q_INTERFACES(QDesignerCustomWidgetInterface)

 protected:
     explicit DemoPlugin(const QString &className, const QString &customSection = QString());

 public:
     QString name() const { return m_className; }
     bool isContainer() const { return false; }
     bool isInitialized() const { return m_initialized; }
     QIcon icon() const { return QIcon(); }
     QString codeTemplate() const { return QString(); }
     QString whatsThis() const { return QString(); }
     QString toolTip() const { return QString(); }
     QString group() const { return "Arthur Widgets [Demo]"; }
     void initialize(QDesignerFormEditorInterface *)
     {
         if (m_initialized)
             return;
         m_initialized = true;
     }
     QString domXml() const { return m_domXml; }

 private:
     const QString m_className;
     const QString m_domXml;
     bool m_initialized;
 };

 DemoPlugin::DemoPlugin(const QString &className, const QString &customSection) :
     m_className(className),
     m_domXml(customWidgetDomXml(className, customSection)),
     m_initialized(false)
 {
 }

 class DeformPlugin : public QObject, public DemoPlugin
 {
     Q_OBJECT

 public:
     explicit DeformPlugin(QObject *parent = 0);
     QString includeFile() const { return QLatin1String("deform.h"); }

     QWidget *createWidget(QWidget *parent)
     {
         PathDeformRenderer *deform = new PathDeformRendererEx(parent);
         deform->setRadius(70);
         deform->setAnimated(false);
         deform->setFontSize(20);
         deform->setText(QLatin1String("Arthur Widgets Demo"));

         return deform;
     }
 };

 DeformPlugin::DeformPlugin(QObject *parent) :
     QObject(parent),
     DemoPlugin(QLatin1String("PathDeformRendererEx"),
                textSingleLinePropertyDeclaration(QLatin1String("PathDeformRendererEx")))
 {
 }

 class XFormRendererEx : public XFormView
 {
     Q_OBJECT
 public:
     XFormRendererEx(QWidget *parent) : XFormView(parent) {}
     QSize sizeHint() const { return QSize(300, 200); }
 };

 class XFormPlugin : public QObject, public DemoPlugin
 {
     Q_OBJECT
 public:
     explicit XFormPlugin(QObject *parent = 0);
     QString includeFile() const { return QLatin1String("xform.h"); }

     QWidget *createWidget(QWidget *parent)
     {
         XFormRendererEx *xform = new XFormRendererEx(parent);
         xform->setText(QLatin1String("Qt - Hello World!!"));
         xform->setPixmap(QPixmap(QLatin1String(":/trolltech/arthurplugin/bg1.jpg")));
         return xform;
     }
 };

 XFormPlugin::XFormPlugin(QObject *parent) :
     QObject(parent),
     DemoPlugin(QLatin1String("XFormRendererEx"),
                textSingleLinePropertyDeclaration(QLatin1String("XFormRendererEx")))
 {
 }

 class GradientEditorPlugin : public QObject, public DemoPlugin
 {
     Q_OBJECT
 public:
     explicit GradientEditorPlugin(QObject *parent = 0) : QObject(parent), DemoPlugin(QLatin1String("GradientEditor")) { }
     QString includeFile() const { return "gradients.h"; }

     QWidget *createWidget(QWidget *parent)
     {
         GradientEditor *editor = new GradientEditor(parent);
         return editor;
     }
 };

 class GradientRendererEx : public GradientRenderer
 {
     Q_OBJECT
 public:
     GradientRendererEx(QWidget *p) : GradientRenderer(p) { }
     QSize sizeHint() const { return QSize(300, 200); }
 };

 class GradientRendererPlugin : public QObject, public DemoPlugin
 {
     Q_OBJECT
 public:
     GradientRendererPlugin(QObject *parent = 0) : QObject(parent), DemoPlugin(QLatin1String("GradientRendererEx")) { }
     QString includeFile() const { return QLatin1String("gradients.h"); }

     QWidget *createWidget(QWidget *parent)
     {
         GradientRenderer *renderer = new GradientRendererEx(parent);
         renderer->setConicalGradient();
         return renderer;
     }
 };

 class PathStrokeRendererEx : public PathStrokeRenderer
 {
     Q_OBJECT
 public:
     explicit PathStrokeRendererEx(QWidget *p) : PathStrokeRenderer(p) { }
     QSize sizeHint() const { return QSize(300, 200); }
 };

 class StrokeRenderPlugin : public QObject, public DemoPlugin
 {
     Q_OBJECT
 public:
     explicit StrokeRenderPlugin(QObject *parent = 0) : QObject(parent), DemoPlugin(QLatin1String("PathStrokeRendererEx")) { }
     QString includeFile() const { return QLatin1String("pathstroke.h"); }

     QWidget *createWidget(QWidget *parent)
     {
         PathStrokeRenderer *stroke = new PathStrokeRendererEx(parent);
         return stroke;
     }
 };

 class CompositionModePlugin : public QObject, public DemoPlugin
 {
     Q_OBJECT
 public:
     explicit CompositionModePlugin(QObject *parent = 0) : QObject(parent), DemoPlugin(QLatin1String("CompositionRenderer")) { }
     QString includeFile() const { return QLatin1String("composition.h"); }

     QWidget *createWidget(QWidget *parent)
     {
         CompositionRenderer *renderer = new CompositionRenderer(parent);
         renderer->setAnimationEnabled(false);
         return renderer;
     }
 };

 class ArthurPlugins : public QObject, public QDesignerCustomWidgetCollectionInterface
 {
     Q_OBJECT
     Q_INTERFACES(QDesignerCustomWidgetCollectionInterface)

 public:
     explicit ArthurPlugins(QObject *parent = 0);
     QList<QDesignerCustomWidgetInterface*> customWidgets() const { return m_plugins; }

 private:
     QList<QDesignerCustomWidgetInterface *> m_plugins;
 };

 ArthurPlugins::ArthurPlugins(QObject *parent) :
     QObject(parent)
 {
     m_plugins << new DeformPlugin(this)
               << new XFormPlugin(this)
               << new GradientEditorPlugin(this)
               << new GradientRendererPlugin(this)
               << new StrokeRenderPlugin(this)
               << new CompositionModePlugin(this);
 }

 #include "plugin.moc"

 Q_EXPORT_PLUGIN2(ArthurPlugins, ArthurPlugins)