Up to now DolphinView and ColumnWidget contained a lot of code duplication regarding generating previews and the dimming of cut items. This has been refactored by introducing an IconManager which takes care itself about generating a preview and dimming cut items. This also allows improving the speed of previews in (near) future (at the moment showing previews from the cache is a lot slower than in KDE 3...).

svn path=/trunk/KDE/kdebase/apps/; revision=759864

1 files changed, 107 insertions, 0 deletions

diff --git a/src/iconmanager.h b/src/iconmanager.h
new file mode 100644
index 000000000..175e4a07e
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+++ b/src/iconmanager.h
@@ -0,0 +1,107 @@
+/***************************************************************************
+ *   Copyright (C) 2008 by Peter Penz <[email protected]>                  *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#ifndef ICONMANAGER_H
+#define ICONMANAGER_H
+
+#include <kurl.h>
+
+#include <QList>
+#include <QObject>
+#include <QPixmap>
+
+class DolphinModel;
+class KFileItem;
+class KFileItemList;
+class KJob;
+
+/**
+ * @brief Manages the icon state of a directory model.
+ *
+ * Per default a preview is generated for each item.
+ * Additionally the clipboard is checked for cut items.
+ * The icon state for cut items gets dimmed automatically.
+ */
+class IconManager : public QObject
+{
+    Q_OBJECT
+
+public:
+    IconManager(QObject* parent, DolphinModel* model);
+    virtual ~IconManager();
+    void setShowPreview(bool show);
+    bool showPreview() const;
+
+private slots:
+    /**
+     * Generates a preview image for each file item in \a items.
+     * The current preview settings (maximum size, 'Show Preview' menu)
+     * are respected.
+     */
+    void generatePreviews(const KFileItemList& items);
+
+    /**
+     * Replaces the icon of the item \a item by the preview pixmap
+     * \a pixmap.
+     */
+    void replaceIcon(const KFileItem& item, const QPixmap& pixmap);
+
+    /**
+     * Is invoked when the preview job has been finished and
+     * set m_previewJob to 0.
+     */
+    void slotPreviewJobFinished(KJob* job);
+
+    /** Synchronizes the item icon with the clipboard of cut items. */
+    void updateCutItems();
+
+private:
+    /**
+     * Returns true, if the item \a item has been cut into
+     * the clipboard.
+     */
+    bool isCutItem(const KFileItem& item) const;
+
+    /** Applies an item effect to all cut items. */
+    void applyCutItemEffect();
+
+private:
+    /**
+     * Remembers the original pixmap for an item before
+     * the cut effect is applied.
+     */
+    struct CutItem
+    {
+        KUrl url;
+        QPixmap pixmap;
+    };
+
+   bool m_showPreview;
+   QList<KJob*> m_previewJobs;
+   DolphinModel* m_dolphinModel;
+
+   QList<CutItem> m_cutItemsCache;
+};
+
+inline bool IconManager::showPreview() const
+{
+    return m_showPreview;
+}
+
+#endif