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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 "ColorGrabObject.h"
#include "Debug.h"
#include <QApplication>
#include <QDesktopWidget>
#include <QCursor>
#include <QMouseEvent>
#if QT_VERSION >= 0x050000
#include <QScreen>
#include <QWindow>
#endif
//______________________________________________
ColorGrabObject::ColorGrabObject( QWidget* parent ):
QObject( parent ),
Counter( "ColorGrabObject" )
{
Debug::Throw( "ColorGrabObject::ColorGrabObject.\n" );
Q_CHECK_PTR( parent );
connect( parent, SIGNAL(clicked()), SLOT(_grabColor()) );
}
//________________________________________________________
void ColorGrabObject::_grabColor()
{
Debug::Throw( "ColorGrabObject::_grabColor.\n" );
_clearCapture();
captureWidget_ = new QDialog( 0, Qt::X11BypassWindowManagerHint );
captureWidget_->installEventFilter( this );
captureWidget_->move( -1000, -1000 );
captureWidget_->setModal( true );
captureWidget_->show();
captureWidget_->grabMouse( Qt::CrossCursor );
#if QT_VERSION >= 0x050000
// need to explicitely override cursor for Qt5
qApp->setOverrideCursor( Qt::CrossCursor );
#endif
}
//_____________________________________________________________
bool ColorGrabObject::eventFilter( QObject* object, QEvent* event )
{
// check object
if( object != captureWidget_ ) return false;
switch( event->type() )
{
case QEvent::MouseButtonPress:
{
QMouseEvent* mouseEvent( static_cast<QMouseEvent*>( event ) );
if( mouseEvent->button() == Qt::LeftButton ) mouseDown_ = true;
return true;
}
case QEvent::MouseMove:
{
QMouseEvent* mouseEvent( static_cast<QMouseEvent*>( event ) );
if( mouseDown_ ) _selectColorFromMouseEvent( mouseEvent );
return true;
}
case QEvent::MouseButtonRelease:
{
// delete grabber
_clearCapture();
#if QT_VERSION >= 0x050000
// need to explicitely release cursor for Qt5
qApp->restoreOverrideCursor();
#endif
QMouseEvent* mouseEvent( static_cast<QMouseEvent*>( event ) );
if( mouseEvent->button() == Qt::LeftButton )
{ _selectColorFromMouseEvent( mouseEvent ); }
return true;
}
default: return false;
}
}
//_____________________________________________________________
void ColorGrabObject::_selectColorFromMouseEvent( QMouseEvent *event )
{
Debug::Throw() << "ColorGrabObject::_selectColorFromMouseEvent - (" << event->globalX() << "," << event->globalY() << ")" << endl;
// grab desktop window under cursor
// convert to image.
#if QT_VERSION >= 0x050000
QPoint globalPosition( event->globalPos() );
#if QT_VERSION >= 0x050300
const qreal dpiRatio( QGuiApplication::primaryScreen()->devicePixelRatio() );
globalPosition.rx()*=dpiRatio;
globalPosition.ry()*=dpiRatio;
#endif
QImage image( QGuiApplication::primaryScreen()->grabWindow(QApplication::desktop()->winId(), globalPosition.x(), globalPosition.y(), 2, 2 ).toImage() );
#else
QImage image( QPixmap::grabWindow(QApplication::desktop()->winId(),event->globalX(), event->globalY(), 2, 2 ).toImage() );
#endif
// ensure image is deep enough
if (image.depth() != 32) image = image.convertToFormat(QImage::Format_RGB32);
// assign color to the selection frame
emit colorSelected( QColor( image.pixel( 1, 1 ) ) );
return;
}
//_________________________________________________________
void ColorGrabObject::_clearCapture()
{
if( captureWidget_ )
{
Debug::Throw( "ColorGrabObject::_clearCapture.\n" );
// release mouse and delete widget
captureWidget_->releaseMouse();
captureWidget_->deleteLater();
captureWidget_ = 0;
}
mouseDown_ = false;
}
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