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

     /****************************************************************************
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     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
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     ** accordance with the Qt Commercial License Agreement provided with the
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     ** General Public License version 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
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     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
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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)