Qt Browser stack when dropping link to QMainWindow - c++

Question

I have simple drag and drop functions implemented in QmainWindow the reference taken from here and here
all i want to do is to accept valid url and open QDialog when the url dropped .
but when the url drooped and the QDialog poped up the browser is stocked in the background until i close the QDialog . this is wrong the browser should be free all the time.
here is my code :
void MainWindow::dragMoveEvent(QDragMoveEvent *event)
{
if (event->mimeData()->hasFormat("text/html"))
{
event->acceptProposedAction();
}
else
{
event->ignore();
}
}
void MainWindow::dragEnterEvent(QDragEnterEvent *event)
{
// accept just text/uri-list mime format
if (event->mimeData()->hasFormat("text/html"))
{
event->acceptProposedAction();
}
else
{
event->ignore();
}
}
void MainWindow::dragLeaveEvent(QDragLeaveEvent *event)
{
event->accept();
}
void MainWindow::dropEvent(QDropEvent *event)
{
QList<QUrl> urlList;
QString fName;
QStringList pathList;
QFileInfo info;
QString suffix;
if (event->mimeData()->hasFormat("text/html"))
{
urlList = event->mimeData()->urls(); // returns list of QUrls
// if just text was dropped, urlList is empty (size == 0)
if ( urlList.size() > 0) // if at least one QUrl is present in list
{
QString url = urlList.at(0).toString();
event->acceptProposedAction();
openDialog(url); // THIS IS THE FUNCTION THAT I OPEN THE QDIALOG window
}
}
//event->acceptProposedAction();
}
void MainWindow::openDialog(QString& slink)
{
QHash<QString,QVariant> DataMap;
QString link = slink;
DataMap.insert("m_webpage",link);
PublishToDialog* pPublishToDialog = new PublishToDialog(this);
pPublishToDialog->Init(DataMap);
if(pPublishToDialog->exec() != QDialog::Accepted)
{
}
}
when i remove the call to the QDialog , so every thing is working fine .
and the browser doesn't stuck. i even tryed as suggested using signal/slot put again
when i start the QDialog when drop invoked the browser stucked!

Answer 1

What exactly is PublishToDialog? I would assume that it is a custom dialog implementation of yours that inherits QDialog. And given this line:
pPublishToDialog->exec() != QDialog::Accepted
This opens the dialog as a modal dialog. A modal dialog is blocking and will block the execution of the current thread until some action is performed on the dialog. Instead of using a modal dialog, you should use a non-modal dialog. Since I am still not sure if PublishToDialog inherits QDialog or what else, I am just going to assume it is. Here is what you could do:
PublishToDialog* pPublishToDialog = new PublishToDialog(this);
// Make it a non-modal dialog
pPublishDialog->setModal(false);
// Connect it to a slot to handle whenever the user performs some action on it
QObject::connect(pPublishDialog, SIGNAL(finished()), this, SLOT(handleDialogAction());
pPublishDialog.show();
You will have to implement handleDialogAction in your code. At the same time, you may want to make pPublishDialog a class-member as you will need it to access QDialog::reuslt in handleDialogAction.