Move the generic hover- and selection-adjustments from DolphinsDetailsView into the new base class DolphinTreeView.

Background info: QTreeView does not respect the width of a cell for the hover-feedback and the selections. This has been adjusted in DolphinDetailsView already, but the required code for this is quite large. This made it tricky to maintain the really Dolphin-specific parts in DolphinDetailsView.

svn path=/trunk/KDE/kdebase/apps/; revision=1184152

1 files changed, 137 insertions, 0 deletions

diff --git a/src/views/dolphintreeview.h b/src/views/dolphintreeview.h
new file mode 100644
index 000000000..67f8eedf2
--- /dev/null
+++ b/src/views/dolphintreeview.h
@@ -0,0 +1,137 @@
+/***************************************************************************
+ *   Copyright (C) 2010 by Peter Penz <[email protected]>             *
+ *   Copyright (C) 2008 by Simon St. James <[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 DOLPHINTREEVIEW_H
+#define DOLPHINTREEVIEW_H
+
+#include <QTreeView>
+#include <libdolphin_export.h>
+
+/**
+ * @brief Extends QTreeView by a custom selection- and hover-mechanism.
+ *
+ * QTreeView does not respect the width of a cell for the hover-feedback
+ * and when selecting items. DolphinTreeView improves this by respecting the
+ * content-width of the first column. The selection-mechanism also
+ * respects the content-width.
+ */
+class LIBDOLPHINPRIVATE_EXPORT DolphinTreeView : public QTreeView
+{
+    Q_OBJECT
+
+public:
+    explicit DolphinTreeView(QWidget* parent = 0);
+    virtual ~DolphinTreeView();
+
+    virtual QRegion visualRegionForSelection(const QItemSelection& selection) const;
+
+protected:   
+    /**
+     * @return True, if the item with the index \p index accepts a drop. In this
+     *         case a visual feedback for the user is given during dragging. Per
+     *         default false is returned.
+     */
+    virtual bool acceptsDrop(const QModelIndex& index) const;
+
+    virtual bool event(QEvent* event);
+    virtual void mousePressEvent(QMouseEvent* event);
+    virtual void mouseMoveEvent(QMouseEvent* event);
+    virtual void mouseReleaseEvent(QMouseEvent* event);
+    virtual void startDrag(Qt::DropActions supportedActions);
+    virtual void dragEnterEvent(QDragEnterEvent* event);
+    virtual void dragMoveEvent(QDragMoveEvent* event);
+    virtual void dragLeaveEvent(QDragLeaveEvent* event);
+    virtual void paintEvent(QPaintEvent* event);
+    virtual void keyPressEvent(QKeyEvent* event);
+    virtual void keyReleaseEvent(QKeyEvent* event);
+    virtual void currentChanged(const QModelIndex& current, const QModelIndex& previous);
+    virtual QModelIndex indexAt (const QPoint& point) const;
+    virtual void setSelection(const QRect& rect, QItemSelectionModel::SelectionFlags command);
+    virtual void scrollTo(const QModelIndex& index, ScrollHint hint = EnsureVisible);
+
+private slots:
+    /**
+     * If the elastic band is currently shown, update the elastic band based on
+     * the current mouse position and ensure that the selection is the set of items
+     * intersecting it.
+     */
+    void updateElasticBandSelection();
+
+    /**
+     * Updates the destination \a destination from
+     * the elastic band to the current mouse position and triggers
+     * an update.
+     */
+    void updateElasticBand();
+
+    /**
+     * Returns the rectangle for the elastic band dependent from the
+     * origin \a origin, the current destination
+     * \a destination and the viewport position.
+     */
+    QRect elasticBandRect() const;
+
+private:
+    /**
+     * Returns true, if \a pos is within the expanding toggle of a tree.
+     */
+    bool isAboveExpandingToggle(const QPoint& pos) const;
+
+private:
+    bool m_keyPressed;        // true if a key is pressed currently; info used by currentChanged()
+    bool m_expandingTogglePressed;
+    bool m_useDefaultIndexAt; // true, if QTreeView::indexAt() should be used
+    bool m_ignoreScrollTo;    // true if calls to scrollTo(...) should do nothing.
+
+    QRect m_dropRect;
+
+    struct ElasticBand
+    {
+        ElasticBand();
+
+        // Elastic band origin and destination coordinates are relative to t
+        // he origin of the view, not the viewport.
+        bool show;
+        QPoint origin;
+        QPoint destination;
+
+        // Optimization mechanisms for use with elastic band selection.
+        // Basically, allow "incremental" updates to the selection based
+        // on the last elastic band shape.
+        QPoint lastSelectionOrigin;
+        QPoint lastSelectionDestination;
+
+        // If true, compute the set of selected elements from scratch (slower)
+        bool ignoreOldInfo;
+
+        // Edges of the filenames that are closest to the edges of oldSelectionRect.
+        // Used to decide whether horizontal changes in the elastic band are likely
+        // to require us to re-check which items are selected.
+        int outsideNearestLeftEdge;
+        int outsideNearestRightEdge;
+        int insideNearestLeftEdge;
+        int insideNearestRightEdge;
+        // The set of items that were selected at the time this band was shown.
+        // NOTE: Unless CTRL was pressed when the band was created, this is always empty.
+        QItemSelection originalSelection;
+    } m_band;
+};
+
+#endif