Hi,
Next code works... :)
{
const QString fileName =
QFileDialog::getOpenFileName( this, tr( "Select Image" ),
QStandardPaths::standardLocations(
QStandardPaths::PicturesLocation ).first(),
tr( "Image Files (*.png *.jpg *.jpeg *.bmp)" ), 0,
QFileDialog::DontUseNativeDialog );
QApplication::processEvents();
if( !fileName.isEmpty() )
{
QImage image( fileName );
if( !image.isNull() )
{
QDrag * drag = new QDrag( this );
QMimeData * mimeData = new QMimeData;
QPixmap p;
QSize s = image.size();
if( s.width() > 50 || s.height() > 50 )
{
s = s.boundedTo( QSize( 50, 50 ) );
p = QPixmap::fromImage(
image.scaled( s, Qt::KeepAspectRatio,
Qt::SmoothTransformation ) );
}
else
p = QPixmap::fromImage( image );
mimeData->setImageData( image );
drag->setMimeData( mimeData );
drag->setPixmap( p );
QApplication::processEvents();
drag->exec();
}
else
QMessageBox::warning( this, tr( "Wrong Image..." ),
tr( "Failed to load image from \"%1\"." ).arg( fileName
) );
}
}
On 12.02.2016 15:25, Igor Mironchik wrote:
Hi folks,
I need to start drag operation in slot connected to QAction::triggered().
Below is what I do in the slot.
{
const QString fileName =
QFileDialog::getOpenFileName( this, tr( "Select Image" ),
QStandardPaths::standardLocations(
QStandardPaths::PicturesLocation ).first(),
tr( "Image Files (*.png *.jpg *.jpeg *.bmp)" ) );
if( !fileName.isEmpty() )
{
QImage image( fileName );
if( !image.isNull() )
{
QDrag * drag = new QDrag( this );
QMimeData * mimeData = new QMimeData;
QPixmap p;
QSize s = image.size();
if( s.width() > 50 || s.height() > 50 )
{
s = s.boundedTo( QSize( 50, 50 ) );
p = QPixmap::fromImage(
image.scaled( s, Qt::KeepAspectRatio,
Qt::SmoothTransformation ) );
}
else
p = QPixmap::fromImage( image );
mimeData->setImageData( image );
drag->setMimeData( mimeData );
drag->setPixmap( p );
QApplication::processEvents();
QMouseEvent event( QEvent::MouseButtonPress,
QPointF( -10.0, -10.0 ), Qt::LeftButton, 0, 0 );
QApplication::sendEvent( this, &event );
drag->exec();
}
else
QMessageBox::warning( this, tr( "Wrong Image..." ),
tr( "Failed to load image from \"%1\"." ).arg(
fileName ) );
}
}
This works if I choose image and press button OK in file dialog.
But if I double-click on the file name in file dialog then drag
appears and immediately disappear...
How to fix it?
Any ideas, please.
Thank you.
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