QML / QWidget & Window icons

J.Hilk

Hi everyone,

I'm looking for the QML equivalent of QWidget::SetWindowIcon and I seem unable to find it in the docu:

Theres the title property but, one for the icon seems to be missing.

I can set an Icon by calling
QApplication::setWindowIcon(); inside the main.cpp
but, thats global and can't be changed, once exec() is called.

My last Idea(untested so far) would be, to move from QQmlApplicationEngine to a QQuickView, because that one has a setIcon function, but I would rather not go the way over QWidgets.

SGaist

Hi,

This interest mailing list thread might be of use.

It looks like the Window type is missing some APIs.

GrecKo

What I would do:

Create an attached type for the window with an icon property, effectively calling QWindow::setIcon.
Usage would be like this:

ApplicationWindow {
    // ...
    WindowHelper.icon: "qrc:/windowIconFile" 
  // ...
}

reference: http://doc.qt.io/qt-5/qtqml-cppintegration-definetypes.html#providing-attached-properties

J.Hilk

Thanks @SGaist and @GrecKo for your input on this issue.

I ended up following the tip I found in the mailing list conversation SGaist posted.

A QML Window is a QQuickWindow which is a subclass of QWindow, so the method you would want to call is QWindow::setIcon(QIcon &). Maybe you can create a subclass of QQuickWindow in C++ ...

this is also basicaly what GrecKo suggested, I think.

The fix was surprisingly easy, and I'm surpised that this hasn't been added to the official release yet, the Mailinglist conversation was on Jan 29, 2013!

the Custom QQuickWindow

#ifndef QUICKWINDOW_H
#define QUICKWINDOW_H

#include <QQuickWindow>
#include <QIcon>

class QuickWindow : public QQuickWindow
{
    Q_OBJECT

    Q_PROPERTY(QString windowIcon READ windowIcon WRITE setWindowIcon NOTIFY windowIconChanged)
public:
    explicit QuickWindow(QQuickWindow *parent = nullptr) : QQuickWindow(parent)  {}

    const inline QString &windowIcon(){return str;}
    inline void setWindowIcon(const QString &str){
         if(str != m_str){
             m_str = str;
             setIcon(QIcon(m_str));
             emit windowIconChanged();
         }
   }

signals:
    void windowIconChanged();

private:
    QString m_str;

};

#endif // QUICKWINDOW_H

main.cpp

#include "quickwindow.h"

int main(int argc, char *argv[]){
   ....
   qmlRegisterType<QuickWindow>("QuickWindow",1,0, "QuickWindow");
    
   QQmlApplicationEngine engine;
   engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
   ....
}

main.qml

import QuickWindow 1.0

QuickWindow{
    ....
    title: qsTr("MyApp")
    windowIcon: ":/Path/to/image.png"
    ....
}

and done.

Thanks for the help guys.