Qt show modal dialog (.ui) on menu item click
c++, modal-dialog, qt
Solution
You need to setup the dialog with the UI you from your `.ui` file. The Qt `uic` compiler generates a header file from your `.ui` file which you need to include in your code. Assumed that your `.ui` file is called `about.ui`, and the Dialog is named `About`, then `uic`creates the file `ui_about.h`, containing a class `Ui_About`. There are different approaches to setup your UI, at simplest you can do
#include "ui_about.h"
...
void MainWindow::on_actionAbout_triggered()
{
about = new QDialog(0,0);
Ui_About aboutUi;
aboutUi.setupUi(about);
about->show();
}
A better approach is to use inheritance, since it encapsulates your dialogs better, so that you can implement any functionality specific to the particular dialog within the sub class:
AboutDialog.h:
#include <QDialog>
#include "ui_about.h"
class AboutDialog : public QDialog, public Ui::About {
Q_OBJECT
public:
AboutDialog( QWidget * parent = 0);
};
AboutDialog.cpp:
AboutDialog::AboutDialog( QWidget * parent) : QDialog(parent) {
setupUi(this);
// perform additional setup here ...
}
Usage:
#include "AboutDialog.h"
...
void MainWindow::on_actionAbout_triggered() {
about = new AboutDialog(this);
about->show();
}
In any case, the important code is to call the `setupUi()` method.
BTW: Your dialog in the code above is non-modal. To show a modal dialog, either set the `windowModality` flag of your dialog to `Qt::ApplicationModal` or use `exec()` instead of `show()`.
Problem
I want to make a simple 'About' modal dialog, called from Help->About application menu. I've created a modal dialog window with QT Creator (.ui file). What code should be in menu 'About' slot? Now I have this code, but it shows up a new modal dialog (not based on my about.ui): ``` void MainWindow::on_actionAbout_triggered() { about = new QDialog(0,0); about->show(); } ``` Thanks!