kfile/kfileplacesview_p.h

   1 /*  This file is part of the KDE project
   2     Copyright (C) 2008 Rafael Fernández López <ereslibre@kde.org>
   3
   4     This library is free software; you can redistribute it and/or
   5     modify it under the terms of the GNU Library General Public
   6     License version 2 as published by the Free Software Foundation.
   7
   8     This library is distributed in the hope that it will be useful,
   9     but WITHOUT ANY WARRANTY; without even the implied warranty of
  10     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11     Library General Public License for more details.
  12
  13     You should have received a copy of the GNU Library General Public License
  14     along with this library; see the file COPYING.LIB.  If not, write to
  15     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  16     Boston, MA 02110-1301, USA.
  17
  18 */
  19
  20 #ifndef KFILEPLACESVIEW_P_H
  21 #define KFILEPLACESVIEW_P_H
  22
  23 #include <QMouseEvent>
  24
  25 class KFilePlacesEventWatcher
  26     : public QObject
  27 {
  28 Q_OBJECT
  29
  30 public:
  31     KFilePlacesEventWatcher(QObject *parent = 0)
  32         : QObject(parent) {}
  33
  34     const QModelIndex &hoveredIndex() const
  35     {
  36         return m_hoveredIndex;
  37     }
  38
  39     const QModelIndex &focusedIndex() const
  40     {
  41         return m_focusedIndex;
  42     }
  43
  44 Q_SIGNALS:
  45     void entryEntered(const QModelIndex &index);
  46     void entryLeft(const QModelIndex &index);
  47
  48 public Q_SLOTS:
  49     void currentIndexChanged(const QModelIndex &index)
  50     {
  51         if (m_focusedIndex.isValid() && m_focusedIndex != m_hoveredIndex) {
  52             emit entryLeft(m_focusedIndex);
  53         }
  54         if (index == m_hoveredIndex) {
  55             m_focusedIndex = m_hoveredIndex;
  56             return;
  57         }
  58         if (index.isValid()) {
  59             emit entryEntered(index);
  60         }
  61         m_focusedIndex = index;
  62     }
  63
  64 protected:
  65     virtual bool eventFilter(QObject *watched, QEvent *event)
  66     {
  67         switch (event->type()) {
  68             case QEvent::MouseMove: {
  69                     QAbstractItemView *view = qobject_cast<QAbstractItemView*>(watched->parent());
  70                     const QModelIndex index = view->indexAt(static_cast<QMouseEvent*>(event)->pos());
  71                     if (index != m_hoveredIndex) {
  72                         if (m_hoveredIndex.isValid() && m_hoveredIndex != m_focusedIndex) {
  73                             emit entryLeft(m_hoveredIndex);
  74                         }
  75                         if (index.isValid() && index != m_focusedIndex) {
  76                             emit entryEntered(index);
  77                         }
  78                         m_hoveredIndex = index;
  79                     }
  80                 }
  81                 break;
  82             case QEvent::Leave:
  83                 if (m_hoveredIndex.isValid() && m_hoveredIndex != m_focusedIndex) {
  84                     emit entryLeft(m_hoveredIndex);
  85                 }
  86                 m_hoveredIndex = QModelIndex();
  87                 break;
  88             case QEvent::MouseButtonPress:
  89             case QEvent::MouseButtonDblClick: {
  90                     // Prevent the selection clearing by clicking on the viewport directly
  91                     QAbstractItemView *view = qobject_cast<QAbstractItemView*>(watched->parent());
  92                     if (!view->indexAt(static_cast<QMouseEvent*>(event)->pos()).isValid()) {
  93                         return true;
  94                     }
  95                 }
  96                 break;
  97             default:
  98                 return false;
  99         }
 100
 101         return false;
 102     }
 103
 104 private:
 105     QPersistentModelIndex m_hoveredIndex;
 106     QPersistentModelIndex m_focusedIndex;
 107 };
 108
 109 #endif