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/******************************************************************************
*
* Copyright (C) 2002 Hugo PEREIRA <mailto: hugo.pereira@free.fr>
*
* This 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 software 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, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
#include "WidgetDragMonitor.h"
#include "XcbUtil.h"
#include <QMouseEvent>
#include <QTimer>
//_________________________________________________________
WidgetDragMonitor::WidgetDragMonitor( QWidget* parent ):
QObject( parent ),
Counter( "WidgetDragMonitor" ),
mode_( DragMove ),
enabled_( false ),
clickCounter_( this, 2 ),
button_( Qt::NoButton ),
target_( nullptr ),
direction_( XcbDefines::_NET_WM_MOVERESIZE_MOVE ),
isDragging_( false )
{ parent->installEventFilter(this); }
//_______________________________________________________
bool WidgetDragMonitor::eventFilter( QObject* object, QEvent* event )
{
switch( event->type() )
{
case QEvent::MouseButtonDblClick:
case QEvent::MouseButtonPress:
{
QWidget* widget( qobject_cast<QWidget*>( object ) );
if( !widget ) return false;
QMouseEvent* mouseEvent( static_cast<QMouseEvent*>( event ) );
button_ = mouseEvent->button();
if( button_ == Qt::LeftButton )
{
event->accept();
target_ = widget;
isDragging_ = false;
dragPosition_ = mouseEvent->pos();
dragSize_ = widget->window()->size();
// check modifiers
if( ( mode_ & DragResize ) && enabled_ && mouseEvent->modifiers() & Qt::ShiftModifier )
{
direction_ = _direction( widget, mouseEvent->pos() );
} else if( mode_ & DragMove ) {
direction_ = XcbDefines::_NET_WM_MOVERESIZE_MOVE;
timer_.start( QApplication::doubleClickInterval(), this );
// handle multiple clicks
clickCounter_.increment();
if( clickCounter_.counts() == 2 )
{
emit stateChangeRequest();
timer_.stop();
}
return true;
} else return false;
}
return false;
}
case QEvent::MouseButtonRelease:
{
event->accept();
_resetDrag();
return true;
}
case QEvent::MouseMove:
{
if( button_ != Qt::LeftButton ) return false;
timer_.stop();
// check against drag distance
QMouseEvent* mouseEvent( static_cast<QMouseEvent*>( event ) );
if( QPoint( mouseEvent->pos() - dragPosition_ ).manhattanLength() < QApplication::startDragDistance() )
{ return false; }
if( !(target_ && object == target_ ) ) return false;
if( !enabled_ )
{
if( mode_ & DragMove )
{
emit stateChangeRequest();
event->accept();
return true;
} else {
return false;
}
} else {
if( (mode_ & DragMove) && direction_ == XcbDefines::_NET_WM_MOVERESIZE_MOVE )
{
// drag
if( !_startDrag() )
{
const QPoint position( target_->window() == target_ ? dragPosition_ : target_->mapTo( target_->window(), dragPosition_ ) );
target_->window()->move( mouseEvent->globalPos() - position );
}
event->accept();
return true;
} else if( mode_ & DragResize ) {
QRect newRect( target_->window()->geometry() );
const QPoint offset( mouseEvent->pos() - dragPosition_ );
switch( direction_ )
{
default:
case XcbDefines::_NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT:
newRect.setWidth( dragSize_.width() + offset.x() );
newRect.setHeight( dragSize_.height() + offset.y() );
break;
case XcbDefines::_NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT:
newRect.setLeft( mouseEvent->globalPos().x() );
newRect.setHeight( dragSize_.height() + offset.y() );
break;
case XcbDefines::_NET_WM_MOVERESIZE_SIZE_TOPRIGHT:
newRect.setWidth( dragSize_.width() + offset.x() );
newRect.setTop( mouseEvent->globalPos().y() );
break;
case XcbDefines::_NET_WM_MOVERESIZE_SIZE_TOPLEFT:
newRect.setLeft( mouseEvent->globalPos().x() );
newRect.setTop( mouseEvent->globalPos().y() );
break;
}
target_->window()->setGeometry( newRect );
event->accept();
return true;
}
}
return false;
}
default: return false;
}
}
//_______________________________________________________
void WidgetDragMonitor::timerEvent( QTimerEvent* event )
{
if( event->timerId() != timer_.timerId() ) return QObject::timerEvent( event );
timer_.stop();
if( button_ != Qt::LeftButton ) return;
if( !enabled_ ) emit stateChangeRequest();
if( !enabled_ ) return;
QTimer::singleShot( 100, this, SLOT(_startDrag()));
}
//________________________________________________
XcbDefines::Direction WidgetDragMonitor::_direction( QWidget* widget, const QPoint& point ) const
{
const int halfWidth( widget->width()/2 );
const int halfHeight( widget->height()/2 );
if( point.x() < halfWidth ) return point.y() < halfHeight ? XcbDefines::_NET_WM_MOVERESIZE_SIZE_TOPLEFT: XcbDefines::_NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT;
else return point.y() < halfHeight ? XcbDefines::_NET_WM_MOVERESIZE_SIZE_TOPRIGHT: XcbDefines::_NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT;
}
//___________________________________________________________
bool WidgetDragMonitor::_startDrag( void )
{
if( !target_ ) return false;
isDragging_ = true;
#if HAVE_XCB
if( XcbUtil::get().moveWidget( target_->window(), target_->mapToGlobal( dragPosition_ ) ) )
{
_resetDrag();
return true;
}
#endif
return false;
}
//___________________________________________________________
void WidgetDragMonitor::_resetDrag( void )
{
if( target_ ) target_->unsetCursor();
target_ = nullptr;
direction_ = XcbDefines::_NET_WM_MOVERESIZE_MOVE;
button_ = Qt::NoButton;
dragPosition_ = QPoint();
timer_.stop();
isDragging_ = false;
}
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