src/views/selectionmanager.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Peter Penz <peter.penz@gmx.at>                  *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "selectionmanager.h"
  21
  22 #include "dolphinmodel.h"
  23 #include "selectiontoggle.h"
  24 #include <kdirmodel.h>
  25 #include <kiconeffect.h>
  26
  27 #include <QAbstractButton>
  28 #include <QAbstractItemView>
  29 #include <QAbstractProxyModel>
  30 #include <QApplication>
  31 #include <QModelIndex>
  32 #include <QPainter>
  33 #include <QPaintEvent>
  34 #include <QRect>
  35 #include <QTimeLine>
  36
  37 SelectionManager::SelectionManager(QAbstractItemView* parent) :
  38     QObject(parent),
  39     m_view(parent),
  40     m_toggle(0),
  41     m_connected(false)
  42 {
  43     connect(parent, SIGNAL(entered(const QModelIndex&)),
  44             this, SLOT(slotEntered(const QModelIndex&)));
  45     connect(parent, SIGNAL(viewportEntered()),
  46             this, SLOT(slotViewportEntered()));
  47     m_toggle = new SelectionToggle(m_view->viewport());
  48     m_toggle->setCheckable(true);
  49     m_toggle->hide();
  50     connect(m_toggle, SIGNAL(clicked(bool)),
  51             this, SLOT(setItemSelected(bool)));
  52 }
  53
  54 SelectionManager::~SelectionManager()
  55 {
  56 }
  57
  58 void SelectionManager::reset()
  59 {
  60     m_toggle->reset();
  61 }
  62
  63 void SelectionManager::slotEntered(const QModelIndex& index)
  64 {
  65     m_toggle->hide();
  66     const bool showToggle = index.isValid() &&
  67                             (index.column() == DolphinModel::Name) &&
  68                             (QApplication::mouseButtons() == Qt::NoButton);
  69     if (showToggle) {
  70         m_toggle->setUrl(urlForIndex(index));
  71
  72         if (!m_connected) {
  73             connect(m_view->model(), SIGNAL(rowsRemoved(const QModelIndex&, int, int)),
  74                     this, SLOT(slotRowsRemoved(const QModelIndex&, int, int)));
  75             connect(m_view->selectionModel(),
  76                     SIGNAL(selectionChanged(const QItemSelection&, const QItemSelection&)),
  77                     this,
  78                     SLOT(slotSelectionChanged(const QItemSelection&, const QItemSelection&)));
  79             m_connected = true;
  80         }
  81
  82         // increase the size of the toggle for large items
  83         const int height = m_view->iconSize().height();
  84         if (height >= KIconLoader::SizeEnormous) {
  85             m_toggle->resize(KIconLoader::SizeMedium, KIconLoader::SizeMedium);
  86         } else if (height >= KIconLoader::SizeLarge) {
  87             m_toggle->resize(KIconLoader::SizeSmallMedium, KIconLoader::SizeSmallMedium);
  88         } else {
  89             m_toggle->resize(KIconLoader::SizeSmall, KIconLoader::SizeSmall);
  90         }
  91
  92         const QRect rect = m_view->visualRect(index);
  93         int x = rect.left();
  94         int y = rect.top();
  95         if (height < KIconLoader::SizeSmallMedium) {
  96             // The height is nearly equal to the smallest toggle height.
  97             // Assure that the toggle is vertically centered instead
  98             // of aligned on the top and gets more horizontal gap.
  99             x += 2;
 100             y += (rect.height() - m_toggle->height()) / 2;
 101         }
 102         m_toggle->move(QPoint(x, y));
 103
 104         QItemSelectionModel* selModel = m_view->selectionModel();
 105         m_toggle->setChecked(selModel->isSelected(index));
 106         m_toggle->show();
 107     } else {
 108         m_toggle->setUrl(KUrl());
 109         disconnect(m_view->model(), SIGNAL(rowsRemoved(const QModelIndex&, int, int)),
 110                    this, SLOT(slotRowsRemoved(const QModelIndex&, int, int)));
 111         disconnect(m_view->selectionModel(),
 112                    SIGNAL(selectionChanged(const QItemSelection&, const QItemSelection&)),
 113                    this,
 114                    SLOT(slotSelectionChanged(const QItemSelection&, const QItemSelection&)));
 115         m_connected = false;
 116     }
 117 }
 118
 119 void SelectionManager::slotViewportEntered()
 120 {
 121     m_toggle->hide();
 122 }
 123
 124 void SelectionManager::setItemSelected(bool selected)
 125 {
 126     emit selectionChanged();
 127
 128     if (!m_toggle->url().isEmpty()) {
 129         const QModelIndex index = indexForUrl(m_toggle->url());
 130         if (index.isValid()) {
 131             QItemSelectionModel* selModel = m_view->selectionModel();
 132             if (selected) {
 133                 selModel->select(index, QItemSelectionModel::Select);
 134             } else {
 135                 selModel->select(index, QItemSelectionModel::Deselect);
 136             }
 137             selModel->setCurrentIndex(index, QItemSelectionModel::Current);
 138         }
 139     }
 140 }
 141
 142 void SelectionManager::slotRowsRemoved(const QModelIndex& parent, int start, int end)
 143 {
 144     Q_UNUSED(parent);
 145     Q_UNUSED(start);
 146     Q_UNUSED(end);
 147     m_toggle->hide();
 148 }
 149
 150 void SelectionManager::slotSelectionChanged(const QItemSelection& selected,
 151                                             const QItemSelection& deselected)
 152 {
 153     // The selection has been changed outside the scope of the selection manager
 154     // (e. g. by the rubberband or the "Select All" action). Take care updating
 155     // the state of the toggle button.
 156     if (!m_toggle->url().isEmpty()) {
 157         const QModelIndex index = indexForUrl(m_toggle->url());
 158         if (index.isValid()) {
 159             if (selected.contains(index)) {
 160                 m_toggle->setChecked(true);
 161             }
 162
 163             if (deselected.contains(index)) {
 164                 m_toggle->setChecked(false);
 165             }
 166         }
 167     }
 168 }
 169
 170 KUrl SelectionManager::urlForIndex(const QModelIndex& index) const
 171 {
 172     QAbstractProxyModel* proxyModel = static_cast<QAbstractProxyModel*>(m_view->model());
 173     KDirModel* dirModel = static_cast<KDirModel*>(proxyModel->sourceModel());
 174     const QModelIndex dirIndex = proxyModel->mapToSource(index);
 175     return dirModel->itemForIndex(dirIndex).url();
 176 }
 177
 178 const QModelIndex SelectionManager::indexForUrl(const KUrl& url) const
 179 {
 180     QAbstractProxyModel* proxyModel = static_cast<QAbstractProxyModel*>(m_view->model());
 181     KDirModel* dirModel = static_cast<KDirModel*>(proxyModel->sourceModel());
 182     const QModelIndex dirIndex = dirModel->indexForUrl(url);
 183     return proxyModel->mapFromSource(dirIndex);
 184 }
 185
 186 #include "selectionmanager.moc"