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/***************************************************************************
* 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;
}
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