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_proxyModel;
  52     m_proxyModel = 0;
  53     delete m_dolphinModel;
  54     m_dolphinModel = 0;
  55     m_dirLister = 0; // deleted by m_dolphinModel
  56 }
  57
  58 QSize TreeViewSidebarPage::sizeHint() const
  59 {
  60     return QSize(200, 400);
  61 }
  62
  63 void TreeViewSidebarPage::setUrl(const KUrl& url)
  64 {
  65     if (!url.isValid() || (url == SidebarPage::url())) {
  66         return;
  67     }
  68
  69     SidebarPage::setUrl(url);
  70     if (m_dirLister != 0) {
  71         loadTree(url);
  72     }
  73 }
  74
  75 void TreeViewSidebarPage::showEvent(QShowEvent* event)
  76 {
  77     if (event->spontaneous()) {
  78         SidebarPage::showEvent(event);
  79         return;
  80     }
  81
  82     if (m_dirLister == 0) {
  83         // Postpone the creating of the dir lister to the first show event.
  84         // This assures that no performance and memory overhead is given when the TreeView is not
  85         // used at all (see TreeViewSidebarPage::setUrl()).
  86         m_dirLister = new KDirLister();
  87         m_dirLister->setDirOnlyMode(true);
  88         m_dirLister->setAutoUpdate(true);
  89         m_dirLister->setMainWindow(this);
  90         m_dirLister->setDelayedMimeTypes(true);
  91         m_dirLister->setAutoErrorHandlingEnabled(false, this);
  92
  93         connect(m_dirLister, SIGNAL(completed()),
  94                 this, SLOT(triggerLoadSubTree()));
  95
  96         Q_ASSERT(m_dolphinModel == 0);
  97         m_dolphinModel = new DolphinModel(this);
  98         m_dolphinModel->setDirLister(m_dirLister);
  99         m_dolphinModel->setDropsAllowed(DolphinModel::DropOnDirectory);
 100         connect(m_dolphinModel, SIGNAL(expand(const QModelIndex&)),
 101                 this, SLOT(triggerExpanding()));
 102
 103         Q_ASSERT(m_proxyModel == 0);
 104         m_proxyModel = new DolphinSortFilterProxyModel(this);
 105         m_proxyModel->setSourceModel(m_dolphinModel);
 106
 107         Q_ASSERT(m_treeView == 0);
 108         m_treeView = new SidebarTreeView(this);
 109         m_treeView->setModel(m_proxyModel);
 110         m_proxyModel->setSorting(DolphinView::SortByName);
 111         m_proxyModel->setSortOrder(Qt::AscendingOrder);
 112
 113         connect(m_treeView, SIGNAL(clicked(const QModelIndex&)),
 114                 this, SLOT(updateActiveView(const QModelIndex&)));
 115         connect(m_treeView, SIGNAL(urlsDropped(const KUrl::List&, const QModelIndex&)),
 116                 this, SLOT(dropUrls(const KUrl::List&, const QModelIndex&)));
 117
 118         QVBoxLayout* layout = new QVBoxLayout(this);
 119         layout->setMargin(0);
 120         layout->addWidget(m_treeView);
 121     }
 122
 123     loadTree(url());
 124     SidebarPage::showEvent(event);
 125 }
 126
 127 void TreeViewSidebarPage::contextMenuEvent(QContextMenuEvent* event)
 128 {
 129     SidebarPage::contextMenuEvent(event);
 130
 131     const QModelIndex index = m_treeView->indexAt(event->pos());
 132     if (!index.isValid()) {
 133         // only open a context menu above a directory item
 134         return;
 135     }
 136
 137     const QModelIndex dolphinModelIndex = m_proxyModel->mapToSource(index);
 138     KFileItem item = m_dolphinModel->itemForIndex(dolphinModelIndex);
 139
 140     emit changeSelection(KFileItemList());
 141     TreeViewContextMenu contextMenu(this, item);
 142     contextMenu.open();
 143 }
 144
 145 void TreeViewSidebarPage::updateActiveView(const QModelIndex& index)
 146 {
 147     const QModelIndex dirIndex = m_proxyModel->mapToSource(index);
 148     const KFileItem item = m_dolphinModel->itemForIndex(dirIndex);
 149     if (!item.isNull()) {
 150         emit changeUrl(item.url());
 151     }
 152 }
 153
 154 void TreeViewSidebarPage::dropUrls(const KUrl::List& urls,
 155                                    const QModelIndex& index)
 156 {
 157     if (index.isValid()) {
 158         const QModelIndex dirIndex = m_proxyModel->mapToSource(index);
 159         KFileItem item = m_dolphinModel->itemForIndex(dirIndex);
 160         Q_ASSERT(!item.isNull());
 161         if (item.isDir()) {
 162             emit urlsDropped(urls, item.url());
 163         }
 164     }
 165 }
 166
 167 void TreeViewSidebarPage::triggerExpanding()
 168 {
 169     // the expanding of the folders may not be done in the context
 170     // of this slot
 171     QMetaObject::invokeMethod(this, "expandToLeafDir", Qt::QueuedConnection);
 172 }
 173
 174 void TreeViewSidebarPage::triggerLoadSubTree()
 175 {
 176     // the loading of the sub tree may not be done in the context
 177     // of this slot
 178     QMetaObject::invokeMethod(this, "loadSubTree", Qt::QueuedConnection);
 179 }
 180
 181 void TreeViewSidebarPage::expandToLeafDir()
 182 {
 183     // expand all directories until the parent directory of m_leafDir
 184     const KUrl parentUrl = m_leafDir.upUrl();
 185     QModelIndex dirIndex = m_dolphinModel->indexForUrl(parentUrl);
 186     QModelIndex proxyIndex = m_proxyModel->mapFromSource(dirIndex);
 187     m_treeView->setExpanded(proxyIndex, true);
 188
 189     // assure that m_leafDir gets selected
 190     dirIndex = m_dolphinModel->indexForUrl(m_leafDir);
 191     proxyIndex = m_proxyModel->mapFromSource(dirIndex);
 192     m_treeView->scrollTo(proxyIndex);
 193
 194     QItemSelectionModel* selModel = m_treeView->selectionModel();
 195     selModel->setCurrentIndex(proxyIndex, QItemSelectionModel::Select);
 196 }
 197
 198
 199 void TreeViewSidebarPage::loadSubTree()
 200 {
 201     QItemSelectionModel* selModel = m_treeView->selectionModel();
 202     selModel->clearSelection();
 203
 204     if (m_leafDir.isParentOf(m_dirLister->url())) {
 205         // The leaf directory is not a child of the base URL, hence
 206         // no sub directory must be loaded or selected.
 207         return;
 208     }
 209
 210     const QModelIndex index = m_dolphinModel->indexForUrl(m_leafDir);
 211     if (index.isValid()) {
 212         // the item with the given URL is already part of the model
 213         const QModelIndex proxyIndex = m_proxyModel->mapFromSource(index);
 214         m_treeView->scrollTo(proxyIndex);
 215         selModel->setCurrentIndex(proxyIndex, QItemSelectionModel::Select);
 216     } else {
 217         // Load all sub directories that need to get expanded for making
 218         // the leaf directory visible. The slot triggerExpanding() will
 219         // get invoked if the expanding has been finished.
 220         m_dolphinModel->expandToUrl(m_leafDir);
 221     }
 222 }
 223
 224 void TreeViewSidebarPage::loadTree(const KUrl& url)
 225 {
 226     Q_ASSERT(m_dirLister != 0);
 227     m_leafDir = url;
 228
 229     // adjust the root of the tree to the base place
 230     KFilePlacesModel* placesModel = DolphinSettings::instance().placesModel();
 231     KUrl baseUrl = placesModel->url(placesModel->closestItem(url));
 232     if (!baseUrl.isValid()) {
 233         // it's possible that no closest item is available and hence an
 234         // empty URL is returned
 235         baseUrl = url;
 236     }
 237
 238     if (m_dirLister->url() != baseUrl) {
 239         m_dirLister->stop();
 240         m_dirLister->openUrl(baseUrl, KDirLister::Reload);
 241     } else {
 242         loadSubTree();
 243     }
 244 }
 245
 246 #include "treeviewsidebarpage.moc"