bool QDragManager::eventFilter(QObject *o, QEvent *e)
{
if (beingCancelled) {
if (e->type() == QEvent::KeyRelease && static_cast<QKeyEvent*>(e)->key() == Qt::Key_Escape) {
qApp->removeEventFilter(this);
Q_ASSERT(object == 0);
beingCancelled = false;
#ifndef QT_NO_LOCALEVENTLOOP
eventLoop->exit();
#else
asyncDragFinished();
#endif
return true; // block the key release
}
return false;
}
if (!o->isWidgetType())
return false;
switch(e->type()) {
case QEvent::ShortcutOverride:
// prevent accelerators from firing while dragging
e->accept();
return true;
case QEvent::KeyPress:
case QEvent::KeyRelease:
{
QKeyEvent *ke = ((QKeyEvent*)e);
if (ke->key() == Qt::Key_Escape && e->type() == QEvent::KeyPress) {
cancel();
qApp->removeEventFilter(this);
beingCancelled = false;
#ifndef QT_NO_LOCALEVENTLOOP
eventLoop->exit();
#else
asyncDragFinished();
#endif
} else {
updateCursor();
}
return true; // Eat all key events
}
case QEvent::MouseButtonPress:
case QEvent::MouseMove:
{
if (!object) { //#### this should not happen
qWarning("QDragManager::eventFilter: No object");
return true;
}
QDragManager *manager = QDragManager::self();
QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;
if (manager->object)
possible_actions = manager->dragPrivate()->possible_actions;
else
possible_actions = Qt::IgnoreAction;
QMouseEvent *me = (QMouseEvent *)e;
if (me->buttons()) {
Qt::DropAction prevAction = global_accepted_action;
QWidget *cw = QApplication::widgetAt(me->globalPos());
// Fix for when we move mouse on to the deco widget
if (qt_qws_dnd_deco && cw == qt_qws_dnd_deco)
cw = object->target();
while (cw && !cw->acceptDrops() && !cw->isWindow())
cw = cw->parentWidget();
if (object->target() != cw) {
if (object->target()) {
QDragLeaveEvent dle;
QApplication::sendEvent(object->target(), &dle);
willDrop = false;
global_accepted_action = Qt::IgnoreAction;
updateCursor();
restoreCursor = true;
object->d_func()->target = 0;
}
if (cw && cw->acceptDrops()) {
object->d_func()->target = cw;
QDragEnterEvent dee(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,
me->buttons(), me->modifiers());
QApplication::sendEvent(object->target(), &dee);
willDrop = dee.isAccepted() && dee.dropAction() != Qt::IgnoreAction;
global_accepted_action = willDrop ? dee.dropAction() : Qt::IgnoreAction;
updateCursor();
restoreCursor = true;
}
} else if (cw) {
QDragMoveEvent dme(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,
me->buttons(), me->modifiers());
if (global_accepted_action != Qt::IgnoreAction) {
dme.setDropAction(global_accepted_action);
dme.accept();
}
QApplication::sendEvent(cw, &dme);
willDrop = dme.isAccepted();
global_accepted_action = willDrop ? dme.dropAction() : Qt::IgnoreAction;
updatePixmap();
updateCursor();
}
if (global_accepted_action != prevAction)
emitActionChanged(global_accepted_action);
}
return true; // Eat all mouse events
}
case QEvent::MouseButtonRelease:
{
qApp->removeEventFilter(this);
if (restoreCursor) {
willDrop = false;
#ifndef QT_NO_CURSOR
QApplication::restoreOverrideCursor();
#endif
restoreCursor = false;
}
if (object && object->target()) {
QMouseEvent *me = (QMouseEvent *)e;
QDragManager *manager = QDragManager::self();
QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;
QDropEvent de(object->target()->mapFromGlobal(me->globalPos()), possible_actions, dropData,
me->buttons(), me->modifiers());
QApplication::sendEvent(object->target(), &de);
if (de.isAccepted())
global_accepted_action = de.dropAction();
else
global_accepted_action = Qt::IgnoreAction;
if (object)
object->deleteLater();
drag_object = object = 0;
}
#ifndef QT_NO_LOCALEVENTLOOP
eventLoop->exit();
#else
asyncDragFinished();
#endif
return true; // Eat all mouse events
}
default:
break;
}
return false;
}
bool QDragManager::eventFilter(QObject *o, QEvent *e)
{
if (beingCancelled) {
return false;
}
if (!o->isWidgetType())
return false;
switch(e->type()) {
case QEvent::MouseButtonPress:
{
}
case QEvent::MouseMove:
{
if (!object) { //#### this should not happen
qWarning("QDragManager::eventFilter: No object");
return true;
}
QDragManager *manager = QDragManager::self();
QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;
if (manager->object)
possible_actions = manager->dragPrivate()->possible_actions;
else
possible_actions = Qt::IgnoreAction;
QMouseEvent *me = (QMouseEvent *)e;
if (me->buttons()) {
Qt::DropAction prevAction = global_accepted_action;
QWidget *cw = QApplication::widgetAt(me->globalPos());
// map the Coords relative to the window.
if (!cw)
return true;
while (cw && !cw->acceptDrops() && !cw->isWindow())
cw = cw->parentWidget();
bool oldWillDrop = willDrop;
if (object->target() != cw) {
if (object->target()) {
QDragLeaveEvent dle;
QApplication::sendEvent(object->target(), &dle);
willDrop = false;
global_accepted_action = Qt::IgnoreAction;
if (oldWillDrop != willDrop)
updateCursor();
object->d_func()->target = 0;
}
if (cw && cw->acceptDrops()) {
object->d_func()->target = cw;
QDragEnterEvent dee(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,
me->buttons(), me->modifiers());
QApplication::sendEvent(object->target(), &dee);
willDrop = dee.isAccepted() && dee.dropAction() != Qt::IgnoreAction;
global_accepted_action = willDrop ? dee.dropAction() : Qt::IgnoreAction;
if (oldWillDrop != willDrop)
updateCursor();
}
} else if (cw) {
QDragMoveEvent dme(cw->mapFromGlobal(me->globalPos()), possible_actions, dropData,
me->buttons(), me->modifiers());
if (global_accepted_action != Qt::IgnoreAction) {
dme.setDropAction(global_accepted_action);
dme.accept();
}
QApplication::sendEvent(cw, &dme);
willDrop = dme.isAccepted();
global_accepted_action = willDrop ? dme.dropAction() : Qt::IgnoreAction;
if (oldWillDrop != willDrop) {
updatePixmap();
updateCursor();
}
}
if (global_accepted_action != prevAction)
emitActionChanged(global_accepted_action);
}
return true; // Eat all mouse events
}
case QEvent::MouseButtonRelease:
{
qApp->removeEventFilter(this);
#ifndef QT_NO_CURSOR
if (restoreCursor) {
QApplication::restoreOverrideCursor();
willDrop = false;
restoreCursor = false;
}
#endif
if (object && object->target()) {
QMouseEvent *me = (QMouseEvent *)e;
QDragManager *manager = QDragManager::self();
QMimeData *dropData = manager->object ? manager->dragPrivate()->data : manager->dropData;
QDropEvent de(object->target()->mapFromGlobal(me->globalPos()), possible_actions, dropData,
me->buttons(), me->modifiers());
QApplication::sendEvent(object->target(), &de);
if (de.isAccepted())
global_accepted_action = de.dropAction();
else
global_accepted_action = Qt::IgnoreAction;
if (object)
object->deleteLater();
drag_object = object = 0;
}
eventLoop->exit();
return true; // Eat all mouse events
}
default:
break;
}
return false;
}