In my application, I've got a popup table that pops up when the user presses a
key (in this case CTRL), and goes away when the user releases the key. While
the table is visible, the user can click on rows to highlight a row. When the
user highlights an item, a signal should be emitted from the table widget, and
then another part of the application should mirror the highlighting action.
What I'm finding is that while the table is up, the signal to the parent class
seems to just be getting queued, and the signal never propagates out UNTIL the
key is released. So the action I'm looking for eventually occurs, but is
delayed. Any ideas on how to get the signal acted on immediately? Relevant
pseudocode below:
class MainWindow : public QMainWindow
{
public slots:
void slotDoOtherStuff(QString, bool);
protected:
virtual void keyPressEvent(QKeyEvent* event);
virtual void keyReleaseEvent(QKeyEvent* event);
private:
QTableView* dataTable;
myModel* dataTableModel;
}
void MainWindow:: MainWindow (QWidget *parent)
{
dataTable = new QTableView(this);
dataTableModel = new myModel(this);
dataTable->setModel(dataTableModel);
connect(dataTableModel, SIGNAL(sigItemClicked(QString,bool)),
this, SLOT(slotDoOtherStuff (QString,bool)));
}
void MainWindow::keyPressEvent(QKeyEvent *event)
{
QMainWindow::keyPressEvent(event);
if (event->key() == mPopupKey)
{
//populate table here
dataTable->show();
}
void MainWindow::keyReleaseEvent(QKeyEvent *event)
{
QMainWindow::keyPressEvent(event);
if (event->key() == mPopupKey)
{
dataTable ->hide();
}
}
void MainWindow:: slotDoOtherStuff(QString,bool)
{
QMainWindow::keyPressEvent(event);
if (event->key() == mPopupKey)
{
//populate table here
dataTable->show();
}
So in the pseudocode above, while the table is shown (i.e. while the CTRL key
is held down), slotDoOtherStuff() never gets called until after the popup key
is released. Then however many sigItemClicked() signals that were queued up are
finally acted upon. So it looks like while the key is pressed, that part of the
event loop isn't spinning? But the user can interact with the popup table while
the key is pressed, so some part of the event loop is still active...
Sean
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