src/treeviewsidebarpage.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 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 "treeviewsidebarpage.h"
  21
  22 #include "dolphinmodel.h"
  23 #include "dolphinmainwindow.h"
  24 #include "dolphinsortfilterproxymodel.h"
  25 #include "dolphinview.h"
  26 #include "dolphinsettings.h"
  27 #include "sidebartreeview.h"
  28 #include "treeviewcontextmenu.h"
  29
  30 #include <kfileplacesmodel.h>
  31 #include <kdirlister.h>
  32 #include <kfileitem.h>
  33
  34 #include <QItemSelection>
  35 #include <QTreeView>
  36 #include <QBoxLayout>
  37 #include <QModelIndex>
  38
  39 TreeViewSidebarPage::TreeViewSidebarPage(QWidget* parent) :
  40     SidebarPage(parent),
  41     m_dirLister(0),
  42     m_dolphinModel(0),
  43     m_proxyModel(0),
  44     m_treeView(0),
  45     m_leafDir()
  46 {
  47 }
  48
  49 TreeViewSidebarPage::~TreeViewSidebarPage()
  50 {
  51     delete m_dirLister;
  52     m_dirLister = 0;
  53 }
  54
  55 QSize TreeViewSidebarPage::sizeHint() const
  56 {
  57     QSize size = SidebarPage::sizeHint();
  58     size.setWidth(200);
  59     return size;
  60 }
  61
  62 void TreeViewSidebarPage::setUrl(const KUrl& url)
  63 {
  64     if (!url.isValid() || (url == SidebarPage::url())) {
  65         return;
  66     }
  67
  68     SidebarPage::setUrl(url);
  69     if (m_dirLister != 0) {
  70         loadTree(url);
  71     }
  72 }
  73
  74 void TreeViewSidebarPage::showEvent(QShowEvent* event)
  75 {
  76     if (event->spontaneous()) {
  77         SidebarPage::showEvent(event);
  78         return;
  79     }
  80
  81     if (m_dirLister == 0) {
  82         // Postpone the creating of the dir lister to the first show event.
  83         // This assures that no performance and memory overhead is given when the TreeView is not
  84         // used at all (see TreeViewSidebarPage::setUrl()).
  85         m_dirLister = new KDirLister();
  86         m_dirLister->setDirOnlyMode(true);
  87         m_dirLister->setAutoUpdate(true);
  88         m_dirLister->setMainWindow(this);
  89         m_dirLister->setDelayedMimeTypes(true);
  90         m_dirLister->setAutoErrorHandlingEnabled(false, this);
  91
  92         Q_ASSERT(m_dolphinModel == 0);
  93         m_dolphinModel = new DolphinModel(this);
  94         m_dolphinModel->setDirLister(m_dirLister);
  95         m_dolphinModel->setDropsAllowed(DolphinModel::DropOnDirectory);
  96         connect(m_dolphinModel, SIGNAL(expand(const QModelIndex&)),
  97                 this, SLOT(triggerExpanding(const QModelIndex&)));
  98
  99         Q_ASSERT(m_proxyModel == 0);
 100         m_proxyModel = new DolphinSortFilterProxyModel(this);
 101         m_proxyModel->setSourceModel(m_dolphinModel);
 102
 103         Q_ASSERT(m_treeView == 0);
 104         m_treeView = new SidebarTreeView(this);
 105         m_treeView->setModel(m_proxyModel);
 106         m_proxyModel->setSorting(DolphinView::SortByName);
 107         m_proxyModel->setSortOrder(Qt::AscendingOrder);
 108
 109         connect(m_treeView, SIGNAL(clicked(const QModelIndex&)),
 110                 this, SLOT(updateActiveView(const QModelIndex&)));
 111         connect(m_treeView, SIGNAL(urlsDropped(const KUrl::List&, const QModelIndex&)),
 112                 this, SLOT(dropUrls(const KUrl::List&, const QModelIndex&)));
 113
 114         QVBoxLayout* layout = new QVBoxLayout(this);
 115         layout->setMargin(0);
 116         layout->addWidget(m_treeView);
 117     }
 118
 119     loadTree(url());
 120     SidebarPage::showEvent(event);
 121 }
 122
 123 void TreeViewSidebarPage::contextMenuEvent(QContextMenuEvent* event)
 124 {
 125     SidebarPage::contextMenuEvent(event);
 126
 127     const QModelIndex index = m_treeView->indexAt(event->pos());
 128     if (!index.isValid()) {
 129         // only open a context menu above a directory item
 130         return;
 131     }
 132
 133     const QModelIndex dolphinModelIndex = m_proxyModel->mapToSource(index);
 134     KFileItem item = m_dolphinModel->itemForIndex(dolphinModelIndex);
 135
 136     emit changeSelection(QList<KFileItem>());
 137     TreeViewContextMenu contextMenu(this, item);
 138     contextMenu.open();
 139 }
 140
 141 void TreeViewSidebarPage::expandSelectionParent()
 142 {
 143     disconnect(m_dirLister, SIGNAL(completed()),
 144                this, SLOT(expandSelectionParent()));
 145
 146     // expand the parent folder of the selected item
 147     KUrl parentUrl = url().upUrl();
 148     if (!m_dirLister->url().isParentOf(parentUrl)) {
 149         return;
 150     }
 151
 152     QModelIndex index = m_dolphinModel->indexForUrl(parentUrl);
 153     if (index.isValid()) {
 154         QModelIndex proxyIndex = m_proxyModel->mapFromSource(index);
 155         m_treeView->setExpanded(proxyIndex, true);
 156
 157         // select the item and assure that the item is visible
 158         index = m_dolphinModel->indexForUrl(url());
 159         if (index.isValid()) {
 160             proxyIndex = m_proxyModel->mapFromSource(index);
 161             m_treeView->scrollTo(proxyIndex);
 162
 163             QItemSelectionModel* selModel = m_treeView->selectionModel();
 164             selModel->setCurrentIndex(proxyIndex, QItemSelectionModel::Select);
 165         }
 166     }
 167 }
 168
 169 void TreeViewSidebarPage::updateActiveView(const QModelIndex& index)
 170 {
 171     const QModelIndex dirIndex = m_proxyModel->mapToSource(index);
 172     const KFileItem item = m_dolphinModel->itemForIndex(dirIndex);
 173     if (!item.isNull()) {
 174         emit changeUrl(item.url());
 175     }
 176 }
 177
 178 void TreeViewSidebarPage::dropUrls(const KUrl::List& urls,
 179                                    const QModelIndex& index)
 180 {
 181     if (index.isValid()) {
 182         const QModelIndex dirIndex = m_proxyModel->mapToSource(index);
 183         KFileItem item = m_dolphinModel->itemForIndex(dirIndex);
 184         Q_ASSERT(!item.isNull());
 185         if (item.isDir()) {
 186             emit urlsDropped(urls, item.url());
 187         }
 188     }
 189 }
 190
 191 void TreeViewSidebarPage::triggerExpanding(const QModelIndex& index)
 192 {
 193     Q_UNUSED(index);
 194     // the expanding of the folders may not be done in the context
 195     // of this slot
 196     QMetaObject::invokeMethod(this, "expandToLeafDir", Qt::QueuedConnection);
 197 }
 198
 199 void TreeViewSidebarPage::expandToLeafDir()
 200 {
 201     // expand all directories until the parent directory of m_leafDir
 202     const KUrl parentUrl = m_leafDir.upUrl();
 203     QModelIndex dirIndex = m_dolphinModel->indexForUrl(parentUrl);
 204     QModelIndex proxyIndex = m_proxyModel->mapFromSource(dirIndex);
 205     m_treeView->setExpanded(proxyIndex, true);
 206
 207     // assure that m_leafDir gets selected
 208     dirIndex = m_dolphinModel->indexForUrl(m_leafDir);
 209     proxyIndex = m_proxyModel->mapFromSource(dirIndex);
 210     m_treeView->scrollTo(proxyIndex);
 211
 212     QItemSelectionModel* selModel = m_treeView->selectionModel();
 213     selModel->setCurrentIndex(proxyIndex, QItemSelectionModel::Select);
 214 }
 215
 216 void TreeViewSidebarPage::loadSubTree()
 217 {
 218     disconnect(m_dirLister, SIGNAL(completed()),
 219                this, SLOT(loadSubTree()));
 220
 221     QItemSelectionModel* selModel = m_treeView->selectionModel();
 222     selModel->clearSelection();
 223
 224     if (m_leafDir.isParentOf(m_dirLister->url())) {
 225         // The leaf directory is not a child of the base URL, hence
 226         // no sub directory must be loaded or selected.
 227         return;
 228     }
 229
 230     const QModelIndex index = m_dolphinModel->indexForUrl(m_leafDir);
 231     if (index.isValid()) {
 232         // the item with the given URL is already part of the model
 233         const QModelIndex proxyIndex = m_proxyModel->mapFromSource(index);
 234         m_treeView->scrollTo(proxyIndex);
 235         selModel->setCurrentIndex(proxyIndex, QItemSelectionModel::Select);
 236     } else {
 237         // Load all sub directories that need to get expanded for making
 238         // the leaf directory visible. The slot triggerExpanding() will
 239         // get invoked if the expanding has been finished.
 240         m_dolphinModel->expandToUrl(m_leafDir);
 241     }
 242 }
 243
 244 void TreeViewSidebarPage::loadTree(const KUrl& url)
 245 {
 246     Q_ASSERT(m_dirLister != 0);
 247     m_leafDir = url;
 248
 249     // adjust the root of the tree to the base place
 250     KFilePlacesModel* placesModel = DolphinSettings::instance().placesModel();
 251     KUrl baseUrl = placesModel->url(placesModel->closestItem(url));
 252     if (!baseUrl.isValid()) {
 253         // it's possible that no closest item is available and hence an
 254         // empty URL is returned
 255         baseUrl = url;
 256     }
 257
 258     connect(m_dirLister, SIGNAL(completed()),
 259             this, SLOT(loadSubTree()));
 260     if (m_dirLister->url() != baseUrl) {
 261         m_dirLister->stop();
 262         m_dirLister->openUrl(baseUrl);
 263     } else {
 264         loadSubTree();
 265     }
 266 }
 267
 268 #include "treeviewsidebarpage.moc"