src/kitemviews/kitemlistcontroller.h

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   Based on the Itemviews NG project from Trolltech Labs:                *
   5  *   http://qt.gitorious.org/qt-labs/itemviews-ng                          *
   6  *                                                                         *
   7  *   This program is free software; you can redistribute it and/or modify  *
   8  *   it under the terms of the GNU General Public License as published by  *
   9  *   the Free Software Foundation; either version 2 of the License, or     *
  10  *   (at your option) any later version.                                   *
  11  *                                                                         *
  12  *   This program is distributed in the hope that it will be useful,       *
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  15  *   GNU General Public License for more details.                          *
  16  *                                                                         *
  17  *   You should have received a copy of the GNU General Public License     *
  18  *   along with this program; if not, write to the                         *
  19  *   Free Software Foundation, Inc.,                                       *
  20  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  21  ***************************************************************************/
  22
  23 #ifndef KITEMLISTCONTROLLER_H
  24 #define KITEMLISTCONTROLLER_H
  25
  26 #include <libdolphin_export.h>
  27
  28 #include <QObject>
  29 #include <QPixmap>
  30 #include <QPointF>
  31 #include <QSet>
  32
  33 class KItemModelBase;
  34 class KItemListKeyboardSearchManager;
  35 class KItemListSelectionManager;
  36 class KItemListView;
  37 class QGraphicsSceneHoverEvent;
  38 class QGraphicsSceneDragDropEvent;
  39 class QGraphicsSceneMouseEvent;
  40 class QGraphicsSceneResizeEvent;
  41 class QGraphicsSceneWheelEvent;
  42 class QHideEvent;
  43 class QInputMethodEvent;
  44 class QKeyEvent;
  45 class QMimeData;
  46 class QShowEvent;
  47 class QTransform;
  48
  49 /**
  50  * @brief Controls the view, model and selection of an item-list.
  51  *
  52  * For a working item-list it is mandatory to set a compatible view and model
  53  * with KItemListController::setView() and KItemListController::setModel().
  54  *
  55  * @see KItemListView
  56  * @see KItemModelBase
  57  * @see KItemListSelectionManager
  58  */
  59 class LIBDOLPHINPRIVATE_EXPORT KItemListController : public QObject
  60 {
  61     Q_OBJECT
  62     Q_ENUMS(SelectionBehavior)
  63     Q_PROPERTY(KItemModelBase* model READ model WRITE setModel)
  64     Q_PROPERTY(KItemListView *view READ view WRITE setView)
  65     Q_PROPERTY(SelectionBehavior selectionBehavior READ selectionBehavior WRITE setSelectionBehavior)
  66
  67 public:
  68     enum SelectionBehavior {
  69         NoSelection,
  70         SingleSelection,
  71         MultiSelection
  72     };
  73
  74     KItemListController(QObject* parent = 0);
  75     virtual ~KItemListController();
  76
  77     void setModel(KItemModelBase* model);
  78     KItemModelBase* model() const;
  79
  80     void setView(KItemListView* view);
  81     KItemListView* view() const;
  82
  83     KItemListSelectionManager* selectionManager() const;
  84
  85     void setSelectionBehavior(SelectionBehavior behavior);
  86     SelectionBehavior selectionBehavior() const;
  87
  88     virtual bool showEvent(QShowEvent* event);
  89     virtual bool hideEvent(QHideEvent* event);
  90     virtual bool keyPressEvent(QKeyEvent* event);
  91     virtual bool inputMethodEvent(QInputMethodEvent* event);
  92     virtual bool mousePressEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform);
  93     virtual bool mouseMoveEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform);
  94     virtual bool mouseReleaseEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform);
  95     virtual bool mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event, const QTransform& transform);
  96     virtual bool dragEnterEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform);
  97     virtual bool dragLeaveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform);
  98     virtual bool dragMoveEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform);
  99     virtual bool dropEvent(QGraphicsSceneDragDropEvent* event, const QTransform& transform);
 100     virtual bool hoverEnterEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform);
 101     virtual bool hoverMoveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform);
 102     virtual bool hoverLeaveEvent(QGraphicsSceneHoverEvent* event, const QTransform& transform);
 103     virtual bool wheelEvent(QGraphicsSceneWheelEvent* event, const QTransform& transform);
 104     virtual bool resizeEvent(QGraphicsSceneResizeEvent* event, const QTransform& transform);
 105     virtual bool processEvent(QEvent* event, const QTransform& transform);
 106
 107 signals:
 108     void itemActivated(int index);
 109     void itemMiddleClicked(int index);
 110     void contextMenuRequested(int index, const QPointF& pos);
 111
 112     /**
 113      * Is emitted if the item with the index \p index gets hovered.
 114      */
 115     void itemHovered(int index);
 116     /**
 117      * Is emitted if the item with the index \p index gets unhovered.
 118      * It is assured that the signal itemHovered() for this index
 119      * has been emitted before.
 120      */
 121     void itemUnhovered(int index);
 122
 123     void itemExpansionToggleClicked(int index);
 124
 125     void modelChanged(KItemModelBase* current, KItemModelBase* previous);
 126     void viewChanged(KItemListView* current, KItemListView* previous);
 127
 128 private slots:
 129     void slotViewOffsetChanged(qreal current, qreal previous);
 130
 131     /**
 132      * Is invoked when the rubberband boundaries have been changed and will select
 133      * all items that are touched by the rubberband.
 134      */
 135     void slotRubberBandChanged();
 136
 137     void slotKeyboardActivationRequested(const QString& text, bool searchFromNextItem);
 138
 139 private:
 140     /**
 141      * Creates a QDrag object to start a drag-operation.
 142      * @return True if the QDrag object has been created. If false is returned
 143      *         there is no implementation available for KItemModelBase::createMimeData().
 144      */
 145     bool startDragging();
 146
 147 private:
 148     bool m_dragging;
 149     SelectionBehavior m_selectionBehavior;
 150     KItemModelBase* m_model;
 151     KItemListView* m_view;
 152     KItemListSelectionManager* m_selectionManager;
 153     KItemListKeyboardSearchManager* m_keyboardManager;
 154     int m_pressedIndex;
 155     QPointF m_pressedMousePos;
 156
 157     /**
 158      * When starting a rubberband selection during a Shift- or Control-key has been
 159      * pressed the current selection should never be deleted. To be able to restore
 160      * the current selection it is remembered in m_oldSelection before
 161      * rubberband gets activated.
 162      */
 163     QSet<int> m_oldSelection;
 164 };
 165
 166 #endif
 167
 168