Merged very early alpha-version of Dolphin 2.0

Dolphin 2.0 will get a new view-engine with the
following improvements:
- Better performance
- Animated transitions
- No clipped filenames due to dynamic item-sizes
- Grouping support for all view-modes
- Non-rectangular selection areas
- Simplified code for better maintenance

More details will be provided in a blog-entry during
the next days.

Please note that the code is in a very
early alpha-stage and although the most tricky parts
have been implemented already very basic things like
drag and drop or selections have not been pushed yet.
Those things are rather trivial to implement but this
still will take some time.

1 files changed, 177 insertions, 0 deletions

diff --git a/src/kitemviews/kfileitemmodelrolesupdater.h b/src/kitemviews/kfileitemmodelrolesupdater.h
new file mode 100644
index 000000000..4931f9d64
--- /dev/null
+++ b/src/kitemviews/kfileitemmodelrolesupdater.h
@@ -0,0 +1,177 @@
+/***************************************************************************
+ *   Copyright (C) 2011 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 KFILEITEMMODELROLESUPDATER_H
+#define KFILEITEMMODELROLESUPDATER_H
+
+#include <libdolphin_export.h>
+
+#include <KFileItem>
+#include <kitemviews/kitemmodelbase.h>
+
+#include <QObject>
+#include <QSet>
+#include <QSize>
+#include <QStringList>
+
+class KFileItemModel;
+class KJob;
+class QPixmap;
+class QTimer;
+
+/**
+ * @brief Resolves expensive roles asynchronously and applies them to the KFileItemModel.
+ *
+ * KFileItemModel only resolves roles that are inexpensive like e.g. the file name or
+ * the permissions. Creating previews or determining the MIME-type can be quite expensive
+ * and KFileItemModelRolesUpdater takes care to update such roles asynchronously.
+ */
+class LIBDOLPHINPRIVATE_EXPORT KFileItemModelRolesUpdater : public QObject
+{
+    Q_OBJECT
+
+public:
+    KFileItemModelRolesUpdater(KFileItemModel* model, QObject* parent = 0);
+    virtual ~KFileItemModelRolesUpdater();
+
+    void setIconSize(const QSize& size);
+    QSize iconSize() const;
+
+    /**
+     * Sets the range of items that are visible currently. The roles
+     * of visible items are resolved first.
+     */
+    void setVisibleIndexRange(int index, int count);
+
+    /**
+     * If \a show is set to true, the "iconPixmap" role will be filled with a preview
+     * of the file. If \a show is false the MIME type icon will be used for the "iconPixmap"
+     * role.
+     */
+    void setPreviewShown(bool show);
+    bool isPreviewShown() const;
+
+    /**
+     * If \a paused is set to true the asynchronous resolving of roles will be paused.
+     * State changes during pauses like changing the icon size or the preview-shown
+     * will be remembered and handled after unpausing.
+     */
+    void setPaused(bool paused);
+    bool isPaused() const;
+
+    /**
+     * Sets the roles that should be resolved asynchronously.
+     */
+    void setRoles(const QSet<QByteArray>& roles);
+    QSet<QByteArray> roles() const;
+
+    /**
+     * Sets the list of enabled thumbnail plugins.
+     * Per default all plugins enabled in the KConfigGroup "PreviewSettings"
+     * are used.
+     *
+     * Note that this method doesn't cause already generated previews
+     * to be regenerated.
+     *
+     * For a list of available plugins, call KServiceTypeTrader::self()->query("ThumbCreator").
+     *
+     * @see enabledPlugins
+     */
+    void setEnabledPlugins(const QStringList& list);
+
+    /**
+     * Returns the list of enabled thumbnail plugins.
+     * @see setEnabledPlugins
+     */
+    QStringList enabledPlugins() const;
+
+private slots:
+    void slotItemsInserted(const KItemRangeList& itemRanges);
+    void slotItemsRemoved(const KItemRangeList& itemRanges);
+    void slotItemsChanged(const KItemRangeList& itemRanges,
+                          const QSet<QByteArray>& roles);
+
+    void slotGotPreview(const KFileItem& item, const QPixmap& pixmap);
+    void slotPreviewFailed(const KFileItem& item);
+
+    /**
+     * Is invoked when the preview job has been finished and
+     * removes the job from the m_previewJobs list.
+     */
+    void slotPreviewJobFinished(KJob* job);
+
+    void resolvePendingRoles();
+    void resolveNextPendingRoles();
+
+private:
+    void startPreviewJob(const KFileItemList& items);
+
+    bool hasPendingRoles() const;
+    void resetPendingRoles();
+    void triggerPendingRolesResolving(int count);
+    void sortAndResolveAllRoles();
+    void sortAndResolvePendingRoles();
+
+    enum ResolveHint {
+        ResolveFast,
+        ResolveAll
+    };
+    bool applyResolvedRoles(const KFileItem& item, ResolveHint hint);
+    QHash<QByteArray, QVariant> rolesData(const KFileItem& item) const;
+
+    KFileItemList sortedItems(const QSet<KFileItem>& items) const;
+
+    static KFileItemList itemSubSet(const QSet<KFileItem>& items, int count);
+    static int subDirectoriesCount(const QString& path);
+
+private:
+    // Property for setPaused()/isPaused().
+    bool m_paused;
+
+    // Property changes during pausing must be remembered to be able
+    // to react when unpausing again:
+    bool m_previewChangedDuringPausing;
+    bool m_iconSizeChangedDuringPausing;
+    bool m_rolesChangedDuringPausing;
+
+    // Property for setPreviewShown()/previewShown().
+    bool m_previewShown;
+
+    // True if the role "iconPixmap" should be cleared when resolving the next
+    // role with resolveRole(). Is necessary if the preview gets disabled
+    // during the roles-updater has been paused by setPaused().
+    bool m_clearPreviews;
+
+    KFileItemModel* m_model;
+    QSize m_iconSize;
+    int m_firstVisibleIndex;
+    int m_lastVisibleIndex;
+    QSet<QByteArray> m_roles;
+    QStringList m_enabledPlugins;
+
+    QSet<KFileItem> m_pendingVisibleItems;
+    QSet<KFileItem> m_pendingInvisibleItems;
+    QList<KJob*> m_previewJobs;
+
+    QTimer* m_resolvePendingRolesTimer;
+};
+
+#endif
+
+