I have subclassed QDialog
to implement functionality similar to QMessageBox
( I needed this to allow for customization). It has a text message and OK, Cancel buttons. I am showing the dialog using exec()
to make it blocking. Now, how do I return values of true/false when the user clicks on OK/Cancel?
I tried connecting the buttons to setResult()
and then, return the result value when clicked, but
class MyMessageBox : public QDialog {
Q_OBJECT
private slots:
void onOKButtonClicked() { this->setResult(QDialog::Accepted); }
void onCancelButtonClicked() { this->setResult(QDialog::Rejected); }
public:
MyMessageBox(QMessageBox::Icon icon, const QString& title,
const QString& text, bool showCancelButton = true,
QWidget* parent = 0);
virtual void resizeEvent(QResizeEvent* e);
QDialog::DialogCode showYourself()
{
this->setWindowModality(Qt::ApplicationModal);
this->exec();
return static_cast<QDialog::DialogCode>(this->result());
}
};
The user will instantiate the class and call showYourself()
which is expected to return the value and also close(and delete) the dialog.
I have posted partial code. Let me know if you need more and I will post the complete version.
Some points :
setResult()
yourself, use QDialog::accept() and QDialog::reject() .onOKButtonClicked
and onCancelButtonClicked
are unnecessary.showYourself()
. Just call exec
and with the events information will flow. You need to add this code before showing the dialog ( this
assume it is in a dialog method):
QObject::connect(acceptButton, SIGNAL(clicked()), this, SLOT(accept()));
QObject::connect(rejectButton, SIGNAL(clicked()), this, SLOT(reject()));
In the caller object you have
void someInitFunctionOrConstructor(){
QObject::connect(mydialog, SIGNAL(finished (int)), this, SLOT(dialogIsFinished(int)));
}
void dialogIsFinished(int){ //this is a slot
if(result == QDialog::Accepted){
//do something
return
}
//do another thing
}
Another solution:
// set signal and slot for "Buttons"
connect(YesButton, SIGNAL(clicked()), dlg, SLOT(accept()));
connect(NoButton, SIGNAL(clicked()), dlg, SLOT(reject()));
// show modal window event loop and wait for button clicks
int dialogCode = dlg->exec();
// act on dialog return code
if(dialogCode == QDialog::Accepted) { // YesButton clicked }
if(dialogCode == QDialog::Rejected) { // NoButton clicked }
Case 1 Clicking the buttons does not close the dialog box.
For this you have to close the dialog on respective SLOTS
, so Use
void onOKButtonClicked(){ this->setResult(QDialog::Accepted); this->close();}
void onCancelButtonClicked(){ this->setResult(QDialog::Rejected);this->close();}
Note: Only after you have clicked the Ok button or Cancel button in a standard QMessageBox, setResult() function is triggered and the status is changed. It's not the same effect when done vice versa.
Case 2 The return value is incorrect.
I think only after your dialog gets closed, you will have the result available in result()
function. So I guess it will be solved, after you have made the changes specified in Case 1.
If it still persists, use your own private member function to resolve it.
This simple checking for messagebox result had me scratching my head until I happened to see ManuelH's comment about calling setResult() AFTER close(). That has to be one of the most unintuitive thing I've encountered in a long while.
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