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Diffstat (limited to 'src/folderexpander.cpp')
| -rw-r--r-- | src/folderexpander.cpp | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/src/folderexpander.cpp b/src/folderexpander.cpp new file mode 100644 index 000000000..f7b73c1f5 --- /dev/null +++ b/src/folderexpander.cpp @@ -0,0 +1,155 @@ +/*************************************************************************** + * Copyright (C) 2008 by Simon St James <[email protected]> * + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + * * + * This program is distributed in the hope that it will be useful, * + * but WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * + * GNU General Public License for more details. * + * * + * You should have received a copy of the GNU General Public License * + * along with this program; if not, write to the * + * Free Software Foundation, Inc., * + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * + ***************************************************************************/ + +#include "folderexpander.h" +#include "dolphinview.h" + +#include "dolphinsettings.h" +#include "dolphin_generalsettings.h" + +#include <QtCore/QTimer> +#include <QtGui/QAbstractItemView> +#include <QtGui/QTreeView> +#include <QtGui/QScrollBar> + +#include <QtCore/QEvent> +#include <QtGui/QDragMoveEvent> + +#include <QtGui/QSortFilterProxyModel> + +#include <kdirmodel.h> +#include <kdebug.h> + +FolderExpander::FolderExpander(QAbstractItemView *view, QSortFilterProxyModel *proxyModel) : + QObject(view), + m_enabled(true), + m_view(view), + m_proxyModel(proxyModel), + m_autoExpandTriggerTimer(0), + m_autoExpandPos() +{ + // Validation. If these fail, the event filter is never + // installed on the view and the FolderExpander is inactive. + if (m_view == 0) { + kWarning() << "Need a view!"; + return; // Not valid. + } + if (m_proxyModel == 0) { + kWarning() << "Need a proxyModel!"; + return; // Not valid. + } + KDirModel *m_dirModel = qobject_cast< KDirModel* >( m_proxyModel->sourceModel() ); + if (m_dirModel == 0) { + kWarning() << "Expected m_proxyModel's sourceModel() to be a KDirModel!"; + return; // Not valid. + } + + // Initialise auto-expand timer. + m_autoExpandTriggerTimer = new QTimer(this); + m_autoExpandTriggerTimer->setSingleShot(true); + connect(m_autoExpandTriggerTimer, SIGNAL(timeout()), + this, SLOT(autoExpandTimeout())); + + // The view scrolling complicates matters, so we want to + // be informed if they occur. + connect(m_view->horizontalScrollBar(), SIGNAL(valueChanged(int)), + this, SLOT(viewScrolled())); + connect(m_view->verticalScrollBar(), SIGNAL(valueChanged(int)), + this, SLOT(viewScrolled())); + + // "Dragging" events are sent to the QAbstractItemView's viewport. + m_view->viewport()->installEventFilter(this); +} + +void FolderExpander::setEnabled(bool enabled) +{ + m_enabled = enabled; +} + +bool FolderExpander::enabled() const +{ + return m_enabled; +} + +FolderExpander::~FolderExpander() +{ +} + +void FolderExpander::viewScrolled() +{ + if (m_autoExpandTriggerTimer->isActive()) { + kDebug() << "Resetting time due to scrolling!"; + // (Re-)set the timer while we're scrolling the view + // (or it's being scrolled by some external mechanism). + // TODO - experiment with this. Cancelling the timer, + // or adding a "penalty" on top of AUTO_EXPAND_DELAY + // might work more nicely when drilling down through the sidebar + // tree. + m_autoExpandTriggerTimer->start(AUTO_EXPAND_DELAY); + } +} + +void FolderExpander::autoExpandTimeout() +{ + if (!m_enabled) { + return; + } + + // We want to find whether the file currently being hovered over is a + // directory. TODO - is there a simpler way, preferably without + // needing to pass in m_proxyModel that has a KDirModel as its sourceModel() ... ? + QModelIndex proxyIndexToExpand = m_view->indexAt(m_autoExpandPos); + QModelIndex indexToExpand = m_proxyModel->mapToSource(proxyIndexToExpand); + KDirModel* m_dirModel = qobject_cast< KDirModel* >(m_proxyModel->sourceModel()); + Q_ASSERT(m_dirModel != 0); + KFileItem itemToExpand = m_dirModel->itemForIndex(indexToExpand ); + + kDebug() << "Need to expand: " << itemToExpand.targetUrl() << " isDir? = " << itemToExpand.isDir(); + + if (itemToExpand.isDir()) { + QTreeView *viewAsTreeView = qobject_cast<QTreeView*>(m_view); + if (viewAsTreeView != 0) { + // Toggle expanded state of this directory. + viewAsTreeView->setExpanded(proxyIndexToExpand, !viewAsTreeView->isExpanded(proxyIndexToExpand)); + } + else { + // Enter this directory. + emit enterDir(proxyIndexToExpand); + } + } +} + +bool FolderExpander::eventFilter(QObject* watched, QEvent* event) +{ + Q_UNUSED(watched); + // We're interested in reading Drag* events, but not filtering them, + // so always return false. + // We just store the position of the hover, here; actually working out + // what the hovered item is and whether it is expandable is done in + // autoExpandTimeout. + if (event->type() == QEvent::DragMove) { + QDragMoveEvent *dragMoveEvent = static_cast<QDragMoveEvent*>(event); + // (Re-)set the timer while we're still moving and dragging. + m_autoExpandTriggerTimer->start(AUTO_EXPAND_DELAY); + m_autoExpandPos = dragMoveEvent->pos(); + } else if (event->type() == QEvent::DragLeave || event->type() == QEvent::Drop) { + m_autoExpandTriggerTimer->stop(); + } + return false; +} |