Hello,

I wrote my own ButtonPlugin for the QtDesigner. In addition I implemented for this ButtonPlugin an own ButtonPropertySheetExtension.

I used the template from QtCreator for creating QtDesigner-Plugins and only changed the following function in ButtonPlugin.cpp:

Qt Code: 
  1. void ButtonPlugin::initialize(QDesignerFormEditorInterface * core)
  2. {
  3.    if (m_initialized)
  4.        return;
  5.  
  6.    QExtensionManager *manager = core->extensionManager();
  7.         Q_ASSERT(manager != 0);
  8.  
  9.    manager->registerExtensions(new ButtonPropertyFactory(manager), Q_TYPEID(QDesignerPropertySheetExtension));
  10.  
  11.    m_initialized = true;
  12. }
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In addition I created ButtonPropertySheetExtension.h:
Qt Code: 
  1. #include <QObject>
  2. #include <QMap>
  3. #include <QString>
  4. #include <QDesignerPropertySheetExtension>
  5. #include <QExtensionFactory>
  6.  
  7. #include "button.h"
  8.  
  9. /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
  10. ButtonPropertyFactory
  11. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
  12. class ButtonPropertyFactory : public QExtensionFactory
  13. {
  14.     Q_OBJECT
  15.  
  16. public:
  17.     ButtonPropertyFactory(QExtensionManager *parent = 0);
  18.  
  19. protected:
  20.     QObject *createExtension(QObject *object, const QString &iid, QObject *parent) const;
  21. };
  22.  
  23. /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
  24. ButtonPropertySheetExtension
  25. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
  26. class ButtonPropertySheetExtension : public QObject, QDesignerPropertySheetExtension
  27. {
  28.     Q_OBJECT
  30.  
  31. public:
  32.       ButtonPropertySheetExtension(Button* p, QObject *parent);
  33.  
  34.  
  35.       int count (void) const;
  36.       bool hasReset ( int index ) const;
  37.       int indexOf ( const QString & name ) const;
  38.       bool isAttribute ( int index ) const;
  39.       bool isChanged ( int index ) const;
  40.       bool isVisible ( int index ) const;
  41.       QVariant property ( int index ) const;
  42.       QString propertyGroup ( int index ) const;
  43.       QString propertyName ( int index ) const;
  44.       bool reset ( int index );
  45.       void setAttribute ( int index, bool attribute );
  46.       void setChanged ( int index, bool changed );
  47.       void setProperty ( int index, const QVariant & value );
  48.       void setPropertyGroup ( int index, const QString & group );
  49.       void setVisible ( int index, bool visible );
  50.  
  51. protected:
  52.  
  53.       Button* _powner;
  54.       const QMetaObject* _p_metaobject;
  55.  
  56.       QMap<int, QString> _PropertyGroups;
  57. };
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And I created ButtonPropertySheetExtension.cpp:
Qt Code: 
  1. /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
  2. ButtonPropertyFactory
  3. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
  4. ButtonPropertyFactory::ButtonPropertyFactory(QExtensionManager *parent)
  6.  {
  7.  }
  8.  
  9.  
  10. QObject *ButtonPropertyFactory::createExtension(QObject *object,
  11.                                                    const QString &iid,
  12.                                                    QObject *parent) const
  13. {
  14.    if (iid != Q_TYPEID(QDesignerPropertySheetExtension))
  15.        return 0;
  16.  
  17.    if (Button* pbutton = qobject_cast<Button*>(object))
  18.        return new ButtonPropertySheetExtension(pbutton, parent);
  19.  
  20.    return 0;
  21. }
  22. /*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
  23. ButtonPropertySheetExtension
  24. *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
  25.  
  26.  
  27. ButtonPropertySheetExtension::ButtonPropertySheetExtension(Button* p, QObject *parent) :
  28.     QObject(parent),
  29.     _powner(p),
  30.     _p_metaobject(_powner->metaObject()),
  31.     _PropertyGroups()
  32.  {
  33.     const int i_object_index = indexOf("objectName");
  34.     setPropertyGroup(i_object_index, "QObject");
  35.  
  36.     const int i_widget_index = indexOf("modal");
  37.     setPropertyGroup(i_widget_index, "QWidget");
  38.  
  39.     const int i_abstractbutton_index = indexOf("text");
  40.     setPropertyGroup(i_abstractbutton_index, "QAbstractButton");
  41.  
  42.     const int i_pushbutton_index = indexOf("autoDefault");
  43.     setPropertyGroup(i_pushbutton_index, "QPushButton");
  44.  }
  45.  
  46.  int ButtonPropertySheetExtension::count () const
  47.  {
  48.      return _p_metaobject->propertyCount();
  49.  }
  50.  
  51.  bool ButtonPropertySheetExtension::hasReset ( int index ) const
  52.  {
  53.     return _p_metaobject->property(index).isResettable();
  54.  }
  55.  
  56.  int ButtonPropertySheetExtension::indexOf ( const QString & name ) const
  57.  {
  58.     return _p_metaobject->indexOfProperty( name.toLatin1().constData() );
  59.  }
  60.  
  61.  bool ButtonPropertySheetExtension::isAttribute ( int index ) const
  62.  {
  63.     Q_UNUSED(index)
  64.     return false;
  65.  }
  66.  
  67.  bool ButtonPropertySheetExtension::isChanged ( int index ) const
  68.  {
  69.      Q_UNUSED(index)
  70.      return false;
  71.  }
  72.  
  73.  bool ButtonPropertySheetExtension::isVisible ( int index ) const
  74.  {
  75.      Q_UNUSED(index)
  76.      return true;
  77.  }
  78.  
  79.  QVariant ButtonPropertySheetExtension::property ( int index ) const
  80.  {
  81.      return _p_metaobject->property(index).read(_powner);
  82.  }
  83.  
  84.  QString ButtonPropertySheetExtension::propertyGroup ( int index ) const
  85.  {
  86.     QMap<int, QString>::const_iterator it = _PropertyGroups.begin();
  87.     if (index > 0){
  88.        while (it.key() <= index){
  89.           it++;
  90.        }
  91.        it--;
  92.     }
  93.     return it.value();
  94.  }
  95.  
  96.  QString ButtonPropertySheetExtension::propertyName ( int index ) const
  97.  {
  98.     return QString(_p_metaobject->property(index).name());
  99.  }
  100.  
  101.  bool ButtonPropertySheetExtension::reset ( int index )
  102.  {
  103.     return _p_metaobject->property(index).reset(_powner);
  104.  }
  105.  
  106.  void ButtonPropertySheetExtension::setAttribute ( int index, bool attribute )
  107.  {
  108.     Q_UNUSED(index)
  109.     Q_UNUSED(attribute)
  110.  }
  111.  
  112.  void ButtonPropertySheetExtension::setChanged ( int index, bool changed )
  113.  {
  114.     Q_UNUSED(index)
  115.     Q_UNUSED(changed)
  116.  }
  117.  
  118.  void ButtonPropertySheetExtension::setProperty ( int index, const QVariant & value )
  119.  {
  120.     QMetaProperty metaproperty = _p_metaobject->property(index);
  121.     metaproperty.write(_powner, value);
  122.  }
  123.  
  124.  void ButtonPropertySheetExtension::setPropertyGroup ( int index, const QString & group )
  125.  {
  126.     _PropertyGroups.insert(index, group);
  127.  }
  128.  
  129.  void ButtonPropertySheetExtension::setVisible ( int index, bool visible )
  130.  {
  131.     Q_UNUSED(index)
  132.     Q_UNUSED(visible)
  133.  }
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So my question, why is the attribute "icon" of QAbstractButton not shown in QtDesigner?

The same behaviour occurs by implementing - for example LabelPlugin (QLabel). Here the "pixmap" Property will be not shown.

I would be very happy aboput any good advice.
Thanks