File indexing completed on 2024-12-01 03:40:49

 /*
     SPDX-FileCopyrightText: 2008 Fredrik Höglund <fredrik@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #ifndef KABSTRACTVIEWADAPTER_H
 #define KABSTRACTVIEWADAPTER_H
 
 #include "kiofilewidgets_export.h"
 #include <QObject>
 
 class QAbstractItemModel;
 class QModelIndex;
 class QPalette;
 class QRect;
 class QSize;
 
 /*
  * TODO KF6 Q_PROPERTY(QSize iconSize READ iconSize WRITE setIconSize NOTIFY iconSizeChanged)
  * TODO KF6 virtual void setIconSize(const QSize &size);
  * TODO KF6 iconSizeChanged();
  *
  * TODO KF6:
  * KAbstractViewAdapter exists to allow KFilePreviewGenerator to be
  * reused with new kinds of views. Unfortunately it doesn't cover
  * all use cases that would be useful right now, in particular there
  * are no change notifications for the properties it has getters for.
  * This requires view implementations to e.g. call updateIcons() on
  * the generator when the icon size changes, which means updating two
  * entities (the generator and the adapter) instead of only one.
  * In KF6 we should make iconSize a Q_PROPERTY with a virtual setter
  * and a change notification signal, and make KFilePreviewGenerator
  * listen to that signal.
  * A related problem is that while the adapter is supposed to inter-
  * face a view to the generator, it is sometimes the generator that
  * is responsible for instantiating the adapter: KDirOperator in this
  * framework uses the KFilePreviewGenerator constructor that doesn't
  * take an adapter instance, which makes the generator instantiate a
  * KIO::DefaultViewAdapter internally, which it doesn't expose to the
  * outside. That means even when a setIconSize() is added,
  * KDirOperator won't be able to call it on the adapter. This mis-
  * design needs to be addressed as well so all change notifications
  * can run through the adapter, also for the DefaultViewAdapter
  * implementation (though for this specific example, perhaps Qt will
  * one day give us a NOTIFY for QAbstractItemView::iconSize that the
  * DefaultViewAdapter can use, obviating the need for KDirOperator
  * to do anything except call setIconSize on its QAbstractItemView).
  */
 
 /**
  * @class KAbstractViewAdapter kabstractviewadapter.h <KAbstractViewAdapter>
  *
  * Interface used by KFilePreviewGenerator to generate previews
  * for files. The interface allows KFilePreviewGenerator to be
  * independent from the view implementation.
  */
 class KIOFILEWIDGETS_EXPORT KAbstractViewAdapter : public QObject
 {
 public:
     enum Signal { ScrollBarValueChanged, IconSizeChanged };
 
     KAbstractViewAdapter(QObject *parent)
         : QObject(parent)
     {
     }
     ~KAbstractViewAdapter() override
     {
     }
     virtual QAbstractItemModel *model() const = 0;
     virtual QSize iconSize() const = 0;
     virtual QPalette palette() const = 0;
     virtual QRect visibleArea() const = 0;
     virtual QRect visualRect(const QModelIndex &index) const = 0;
 
     // TODO KF6 make this connect work with a PointerToMemberFunction/Functor
     virtual void connect(Signal signal, QObject *receiver, const char *slot) = 0;
 };
 
 #endif