Qt::Tool

[JeanC]

As soon as I setWindowFlags(Qt::Tool) strange things start happening.

The window does not get keyboard focus on startup.
When closing with the X in the upper right corder, the process is not terminated (but it does when called via slot aApp quit().
Also closeEvent(QCloseEvent *event) does not get called.

It does this with an otherwise empty test project.

There's a Qt example program windowflags, but this one gets terminated when choosing a Tool window.
What could this be?

P.s. I'm using qdevelop, great tool, and the project is in debug mode.

[edit] I think a window with Qt::Tool flag cannot be a normal mainwindow. It is a qwidget in the windowflags example, not a qmainwindow.

[jpn]

Could you provide a minimal compilable example we could try ourselves?

[luf]

When reading your post, it looks like you are trying to put a QT::tool flag on a widget inside a QMainWindow.

If that is the case, it is correct that strange things will happen, as it tries making a tool window out of your widget inside a QMainWindow. Try using the QT::tool flag on either a dialog or the mainwindow directly if you are trying to have a tooltip-like-window

[JeanC]

@jpn
Sorry I hadn't noticed your question untill now.

#include <QApplication>
#include "mainwindowimpl.h"
//
int main(int argc, char ** argv)
{
	QApplication app( argc, argv );
	MainWindowImpl win;
	win.show(); 
	app.connect( &app, SIGNAL( lastWindowClosed() ), &app, SLOT( quit() ) );
	return app.exec();
}

#include <QApplication>
#include "mainwindowimpl.h"
//
int main(int argc, char ** argv)
{
	QApplication app( argc, argv );
	MainWindowImpl win;
	win.show(); 
	app.connect( &app, SIGNAL( lastWindowClosed() ), &app, SLOT( quit() ) );
	return app.exec();
}

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#include "mainwindowimpl.h"
//
MainWindowImpl::MainWindowImpl( QWidget * parent, Qt::WFlags f) 
	: QMainWindow(parent, f)
{
setupUi(this);
setWindowFlags(Qt::Tool);
}

#include "mainwindowimpl.h"
//
MainWindowImpl::MainWindowImpl( QWidget * parent, Qt::WFlags f) 
	: QMainWindow(parent, f)
{
setupUi(this);
setWindowFlags(Qt::Tool);
}

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#ifndef MAINWINDOWIMPL_H
#define MAINWINDOWIMPL_H
//
#include <QMainWindow>
#include "ui_mainwindow.h"
//
class MainWindowImpl : public QMainWindow, public Ui::MainWindow
{
Q_OBJECT
public:
	MainWindowImpl( QWidget * parent = 0, Qt::WFlags f = 0 );
private slots:
};
#endif

#ifndef MAINWINDOWIMPL_H
#define MAINWINDOWIMPL_H
//
#include <QMainWindow>
#include "ui_mainwindow.h"
//
class MainWindowImpl : public QMainWindow, public Ui::MainWindow
{
Q_OBJECT
public:
	MainWindowImpl( QWidget * parent = 0, Qt::WFlags f = 0 );
private slots:
};
#endif

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@luf
Well no, it's on a main window as you can see.
The example 'windowsflags' uses a widget to set Qt::Tool and is working,

[jpn]

Alright, I found the reason. QWidget::create() clears the Qt::WA_QuitOnClose attribute for anything but Qt::Window, Qt::Widget or Qt::Dialog. The workaround is to call for example QWidget::show() first, and set the attribute by hand afterwards:

#include <QtGui>
 
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    QMainWindow win(0, Qt::Tool);
    win.show(); // must be called before setting Qt::WA_QuitOnClose
    win.setAttribute(Qt::WA_QuitOnClose);
    return app.exec();
}

#include <QtGui>

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    QMainWindow win(0, Qt::Tool);
    win.show(); // must be called before setting Qt::WA_QuitOnClose
    win.setAttribute(Qt::WA_QuitOnClose);
    return app.exec();
}

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[JeanC]

Thanks jpn,

There is another issue. That window does not get focus at startup. Calling setFocus() in main or in the constructor does not help.

[jpn]

Looks like you have to explicitly activate the window:

win.activateWindow();

win.activateWindow();

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[JeanC]

Grr, that won't set focus jpn. Neither in main nor constructor.

Looks like you have to explicitly activate the window:

win.activateWindow();

win.activateWindow();

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[jpn]

Alright, this seems to be something WM specific then. While it worked on Windows the window stays inactive on X11. Try this:

// main.cpp
#include <QtGui>
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
    public:
        MainWindow(QWidget* parent = 0, Qt::WindowFlags flags = 0)
            : QMainWindow(parent, flags)
        {
            setCentralWidget(new QTextEdit(this));
        }
 
    public slots:
        void activateWindow()
        {
            QMainWindow::activateWindow();
        }
};
 
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    MainWindow win(0, Qt::Tool);
    win.show(); // must be called before setting Qt::WA_QuitOnClose
    win.setAttribute(Qt::WA_QuitOnClose);
    QTimer::singleShot(0, &win, SLOT(activateWindow()));
    return app.exec();
}
 
#include "main.moc"

// main.cpp
#include <QtGui>

class MainWindow : public QMainWindow
{
    Q_OBJECT

    public:
        MainWindow(QWidget* parent = 0, Qt::WindowFlags flags = 0)
            : QMainWindow(parent, flags)
        {
            setCentralWidget(new QTextEdit(this));
        }

    public slots:
        void activateWindow()
        {
            QMainWindow::activateWindow();
        }
};

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    MainWindow win(0, Qt::Tool);
    win.show(); // must be called before setting Qt::WA_QuitOnClose
    win.setAttribute(Qt::WA_QuitOnClose);
    QTimer::singleShot(0, &win, SLOT(activateWindow()));
    return app.exec();
}

#include "main.moc"

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PS. Could you update your profile to indicate used platforms, please?

[JeanC]

Works! Thanks.

Alright, this seems to be something WM specific then. While it worked on Windows the window stays inactive on X11. Try this:

Done. Only ubuntu so far, on win I used c++ builder.

PS. Could you update your profile to indicate used platforms, please?