Details view: Optionally remember user changed column-widths

If the user changed a column-width in the details-view, up to now
the width got reset when changing a directory or when restarting
Dolphin. Now the column-widths automatically get remembered for each
directory in case if the user has modified the width. The automatic
resizing is still turn on per default. The storing of the custom
column-width can easily be reset by right clicking on the header and
selecting "Automatic Column Widths" from the context-menu.

Some finetuning is still necessary (e.g. the "Adjust View Properties"
dialog currently is not aware about this setting) but this will
be fixed during the next weeks.

BUG: 264434
FIXED-IN: 4.9.0

1 files changed, 160 insertions, 0 deletions

diff --git a/src/kitemviews/kitemlistheaderwidget_p.h b/src/kitemviews/kitemlistheaderwidget_p.h
new file mode 100644
index 000000000..ea8bb1ef9
--- /dev/null
+++ b/src/kitemviews/kitemlistheaderwidget_p.h
@@ -0,0 +1,160 @@
+/***************************************************************************
+ *   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 KITEMLISTHEADERWIDGET_H
+#define KITEMLISTHEADERWIDGET_H
+
+#include <libdolphin_export.h>
+#include <QGraphicsWidget>
+#include <QHash>
+#include <QList>
+
+class KItemModelBase;
+
+/**
+ * @brief Widget the implements the header for KItemListView showing the currently used roles.
+ *
+ * The widget is an internal API, the user of KItemListView may only access the
+ * class KItemListHeader.
+ */
+class LIBDOLPHINPRIVATE_EXPORT KItemListHeaderWidget : public QGraphicsWidget
+{
+    Q_OBJECT
+
+public:
+    KItemListHeaderWidget(QGraphicsWidget* parent = 0);
+    virtual ~KItemListHeaderWidget();
+
+    void setModel(KItemModelBase* model);
+    KItemModelBase* model() const;
+
+    void setAutomaticColumnResizing(bool automatic);
+    bool automaticColumnResizing() const;
+
+    void setColumns(const QList<QByteArray>& roles);
+    QList<QByteArray> columns() const;
+
+    void setColumnWidth(const QByteArray& role, qreal width);
+    qreal columnWidth(const QByteArray& role) const;
+
+    qreal minimumColumnWidth() const;
+
+    virtual void paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget = 0);
+
+signals:
+    /**
+     * Is emitted if the width of a visible role has been adjusted by the user with the mouse
+     * (no signal is emitted if KItemListHeader::setVisibleRoleWidth() is invoked).
+     */
+    void columnWidthChanged(const QByteArray& role,
+                            qreal currentWidth,
+                            qreal previousWidth);
+
+    /**
+     * Is emitted if the position of the column has been changed.
+     */
+    void columnMoved(const QByteArray& role, int currentIndex, int previousIndex);
+
+    /**
+     * Is emitted if the user has changed the sort order by clicking on a
+     * header item. The sort order of the model has already been adjusted to
+     * the current sort order. Note that no signal will be emitted if the
+     * sort order of the model has been changed without user interaction.
+     */
+    void sortOrderChanged(Qt::SortOrder current, Qt::SortOrder previous);
+
+    /**
+     * Is emitted if the user has changed the sort role by clicking on a
+     * header item. The sort role of the model has already been adjusted to
+     * the current sort role. Note that no signal will be emitted if the
+     * sort role of the model has been changed without user interaction.
+     */
+    void sortRoleChanged(const QByteArray& current, const QByteArray& previous);
+
+protected:
+    virtual void mousePressEvent(QGraphicsSceneMouseEvent* event);
+    virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent* event);
+    virtual void mouseMoveEvent(QGraphicsSceneMouseEvent* event);
+    virtual void hoverEnterEvent(QGraphicsSceneHoverEvent* event);
+    virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent* event);
+    virtual void hoverMoveEvent(QGraphicsSceneHoverEvent* event);
+
+private slots:
+    void slotSortRoleChanged(const QByteArray& current, const QByteArray& previous);
+    void slotSortOrderChanged(Qt::SortOrder current, Qt::SortOrder previous);
+
+private:
+    void paintRole(QPainter* painter,
+                   const QByteArray& role,
+                   const QRectF& rect,
+                   int orderIndex,
+                   QWidget* widget = 0) const;
+
+    void updatePressedRoleIndex(const QPointF& pos);
+    void updateHoveredRoleIndex(const QPointF& pos);
+    int roleIndexAt(const QPointF& pos) const;
+    bool isAboveRoleGrip(const QPointF& pos, int roleIndex) const;
+
+    /**
+     * Creates a pixmap of the role with the index \a roleIndex that is shown
+     * during moving a role.
+     */
+    QPixmap createRolePixmap(int roleIndex) const;
+
+    /**
+     * @return Target index of the currently moving visible role based on the current
+     *         state of m_movingRole.
+     */
+    int targetOfMovingRole() const;
+
+    /**
+     * @return x-position of the left border of the role \a role.
+     */
+    qreal roleXPosition(const QByteArray& role) const;
+
+private:
+    enum RoleOperation
+    {
+        NoRoleOperation,
+        ResizeRoleOperation,
+        MoveRoleOperation
+    };
+
+    bool m_automaticColumnResizing;
+    KItemModelBase* m_model;
+    QList<QByteArray> m_columns;
+    QHash<QByteArray, qreal> m_columnsWidths;
+
+    int m_hoveredRoleIndex;
+    int m_pressedRoleIndex;
+    RoleOperation m_roleOperation;
+    QPointF m_pressedMousePos;
+
+    struct MovingRole
+    {
+        QPixmap pixmap;
+        int x;
+        int xDec;
+        int index;
+    } m_movingRole;
+};
+
+#endif
+
+