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 "dolphinsortfilterproxymodel.h"
  24 #include "dolphinview.h"
  25 #include "dolphinsettings.h"
  26 #include "sidebartreeview.h"
  27 #include "treeviewcontextmenu.h"
  28
  29 #include <kfileplacesmodel.h>
  30 #include <kdirlister.h>
  31 #include <kfileitem.h>
  32
  33 #include <QItemSelection>
  34 #include <QTreeView>
  35 #include <QBoxLayout>
  36 #include <QModelIndex>
  37
  38 TreeViewSidebarPage::TreeViewSidebarPage(QWidget* parent) :
  39     SidebarPage(parent),
  40     m_dirLister(0),
  41     m_dolphinModel(0),
  42     m_proxyModel(0),
  43     m_treeView(0),
  44     m_leafDir()
  45 {
  46 }
  47
  48 TreeViewSidebarPage::~TreeViewSidebarPage()
  49 {
  50     delete m_proxyModel;
  51     m_proxyModel = 0;
  52     delete m_dolphinModel;
  53     m_dolphinModel = 0;
  54     m_dirLister = 0; // deleted by m_dolphinModel
  55 }
  56
  57 QSize TreeViewSidebarPage::sizeHint() const
  58 {
  59     return QSize(200, 400);
  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         connect(m_dirLister, SIGNAL(completed()),
  93                 this, SLOT(triggerLoadSubTree()));
  94
  95         Q_ASSERT(m_dolphinModel == 0);
  96         m_dolphinModel = new DolphinModel(this);
  97         m_dolphinModel->setDirLister(m_dirLister);
  98         m_dolphinModel->setDropsAllowed(DolphinModel::DropOnDirectory);
  99         connect(m_dolphinModel, SIGNAL(expand(const QModelIndex&)),
 100                 this, SLOT(triggerExpanding()));
 101
 102         Q_ASSERT(m_proxyModel == 0);
 103         m_proxyModel = new DolphinSortFilterProxyModel(this);
 104         m_proxyModel->setSourceModel(m_dolphinModel);
 105
 106         Q_ASSERT(m_treeView == 0);
 107         m_treeView = new SidebarTreeView(this);
 108         m_treeView->setModel(m_proxyModel);
 109         m_proxyModel->setSorting(DolphinView::SortByName);
 110         m_proxyModel->setSortOrder(Qt::AscendingOrder);
 111
 112         connect(m_treeView, SIGNAL(clicked(const QModelIndex&)),
 113                 this, SLOT(updateActiveView(const QModelIndex&)));
 114         connect(m_treeView, SIGNAL(urlsDropped(const KUrl::List&, const QModelIndex&)),
 115                 this, SLOT(dropUrls(const KUrl::List&, const QModelIndex&)));
 116
 117         QVBoxLayout* layout = new QVBoxLayout(this);
 118         layout->setMargin(0);
 119         layout->addWidget(m_treeView);
 120     }
 121
 122     loadTree(url());
 123     SidebarPage::showEvent(event);
 124 }
 125
 126 void TreeViewSidebarPage::contextMenuEvent(QContextMenuEvent* event)
 127 {
 128     SidebarPage::contextMenuEvent(event);
 129
 130     const QModelIndex index = m_treeView->indexAt(event->pos());
 131     if (!index.isValid()) {
 132         // only open a context menu above a directory item
 133         return;
 134     }
 135
 136     const QModelIndex dolphinModelIndex = m_proxyModel->mapToSource(index);
 137     KFileItem item = m_dolphinModel->itemForIndex(dolphinModelIndex);
 138
 139     emit changeSelection(KFileItemList());
 140     TreeViewContextMenu contextMenu(this, item);
 141     contextMenu.open();
 142 }
 143
 144 void TreeViewSidebarPage::updateActiveView(const QModelIndex& index)
 145 {
 146     const QModelIndex dirIndex = m_proxyModel->mapToSource(index);
 147     const KFileItem item = m_dolphinModel->itemForIndex(dirIndex);
 148     if (!item.isNull()) {
 149         emit changeUrl(item.url());
 150     }
 151 }
 152
 153 void TreeViewSidebarPage::dropUrls(const KUrl::List& urls,
 154                                    const QModelIndex& index)
 155 {
 156     if (index.isValid()) {
 157         const QModelIndex dirIndex = m_proxyModel->mapToSource(index);
 158         KFileItem item = m_dolphinModel->itemForIndex(dirIndex);
 159         Q_ASSERT(!item.isNull());
 160         if (item.isDir()) {
 161             emit urlsDropped(urls, item.url());
 162         }
 163     }
 164 }
 165
 166 void TreeViewSidebarPage::triggerExpanding()
 167 {
 168     // the expanding of the folders may not be done in the context
 169     // of this slot
 170     QMetaObject::invokeMethod(this, "expandToLeafDir", Qt::QueuedConnection);
 171 }
 172
 173 void TreeViewSidebarPage::triggerLoadSubTree()
 174 {
 175     // the loading of the sub tree may not be done in the context
 176     // of this slot
 177     QMetaObject::invokeMethod(this, "loadSubTree", Qt::QueuedConnection);
 178 }
 179
 180 void TreeViewSidebarPage::expandToLeafDir()
 181 {
 182     // expand all directories until the parent directory of m_leafDir
 183     const KUrl parentUrl = m_leafDir.upUrl();
 184     QModelIndex dirIndex = m_dolphinModel->indexForUrl(parentUrl);
 185     QModelIndex proxyIndex = m_proxyModel->mapFromSource(dirIndex);
 186     m_treeView->setExpanded(proxyIndex, true);
 187
 188     // assure that m_leafDir gets selected
 189     dirIndex = m_dolphinModel->indexForUrl(m_leafDir);
 190     proxyIndex = m_proxyModel->mapFromSource(dirIndex);
 191     m_treeView->scrollTo(proxyIndex);
 192
 193     QItemSelectionModel* selModel = m_treeView->selectionModel();
 194     selModel->setCurrentIndex(proxyIndex, QItemSelectionModel::Select);
 195
 196     m_treeView->resizeColumnToContents(DolphinModel::Name);
 197 }
 198
 199
 200 void TreeViewSidebarPage::loadSubTree()
 201 {
 202     QItemSelectionModel* selModel = m_treeView->selectionModel();
 203     selModel->clearSelection();
 204
 205     if (m_leafDir.isParentOf(m_dirLister->url())) {
 206         m_treeView->resizeColumnToContents(DolphinModel::Name);
 207
 208         // The leaf directory is not a child of the base URL, hence
 209         // no sub directory must be loaded or selected.
 210         return;
 211     }
 212
 213     const QModelIndex index = m_dolphinModel->indexForUrl(m_leafDir);
 214     if (index.isValid()) {
 215         // the item with the given URL is already part of the model
 216         const QModelIndex proxyIndex = m_proxyModel->mapFromSource(index);
 217         m_treeView->scrollTo(proxyIndex);
 218         selModel->setCurrentIndex(proxyIndex, QItemSelectionModel::Select);
 219     } else {
 220         // Load all sub directories that need to get expanded for making
 221         // the leaf directory visible. The slot triggerExpanding() will
 222         // get invoked if the expanding has been finished.
 223         m_dolphinModel->expandToUrl(m_leafDir);
 224     }
 225
 226     m_treeView->resizeColumnToContents(DolphinModel::Name);
 227 }
 228
 229 void TreeViewSidebarPage::loadTree(const KUrl& url)
 230 {
 231     Q_ASSERT(m_dirLister != 0);
 232     m_leafDir = url;
 233
 234     // adjust the root of the tree to the base place
 235     KFilePlacesModel* placesModel = DolphinSettings::instance().placesModel();
 236     KUrl baseUrl = placesModel->url(placesModel->closestItem(url));
 237     if (!baseUrl.isValid()) {
 238         // it's possible that no closest item is available and hence an
 239         // empty URL is returned
 240         baseUrl = url;
 241     }
 242
 243     if (m_dirLister->url() != baseUrl) {
 244         m_dirLister->stop();
 245         m_dirLister->openUrl(baseUrl, KDirLister::Reload);
 246     } else {
 247         loadSubTree();
 248     }
 249 }
 250
 251 #include "treeviewsidebarpage.moc"