4. QML / QWidget & Window icons

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QML / QWidget & Window icons

  • Moderators

    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.

    0
  • Moderators

    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.

    1 1 Reply
  • Lifetime Qt Champion

    Hi,

    This interest mailing list thread might be of use.

    It looks like the Window type is missing some APIs.

    2
  • Qt Champions 2018

    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

    2
  • Moderators

    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.

    1 1 Reply

  • @J.Hilk said in QML / QWidget & Window icons:

    const inline QString &windowIcon(){return str;}

    Hi J.Hilk,

    I just wonder that your solution work..
    I got a "str was not declared in this scope for

    const inline QString &windowIcon(){return str;}

    May you can give your code a try with the recend Qt-Version and QtCreator 4.9.0?

    Kind regards,

    J-I W.

    Here for reference my system environment:

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qt.network.ssl: QSslSocket: cannot resolve DTLSv1_2_server_method
qt.network.ssl: QSslSocket: cannot resolve DTLSv1_2_client_method
qt.network.ssl: QSslSocket: cannot resolve SSL_CONF_CTX_new
qt.network.ssl: QSslSocket: cannot resolve SSL_CONF_CTX_free
qt.network.ssl: QSslSocket: cannot resolve SSL_CONF_CTX_set_ssl_ctx
qt.network.ssl: QSslSocket: cannot resolve SSL_CONF_CTX_set_flags
qt.network.ssl: QSslSocket: cannot resolve SSL_CONF_CTX_finish
qt.network.ssl: QSslSocket: cannot resolve SSL_CONF_cmd
qt.network.ssl: QSslSocket: cannot resolve SSL_set_alpn_protos
qt.network.ssl: QSslSocket: cannot resolve SSL_CTX_set_alpn_select_cb
qt.network.ssl: QSslSocket: cannot resolve SSL_get0_alpn_selected
qt.network.ssl: QSslSocket: cannot resolve DTLS_server_method
qt.network.ssl: QSslSocket: cannot resolve DTLS_client_method

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Qt Creator 4.9.0
Based on Qt 5.12.2 (GCC 5.3.1 20160406 (Red Hat 5.3.1-6), 64 bit)
From revision 7885bc899f
Built on Apr 12 2019 00:20:28

{noformat}
    0 1 Reply
  • Moderators

    hi @nightshift and welcome
    that must have been a copy and past error on my side, as windowIcon() should return the member variable m_str
    can't believe, I missed that x)

    2 1 Reply
  • Qt Champions 2018

    This must be a typo. return m_str will work.

    Note that by using QQuickWindow as a base class, you will lose some of the functionnality of QML Window, and even more of ApplicationWindow.

    That's why I suggested using an attached object so that it could attach to any arbitrary window without having to subclass one.

    2

  • @J.Hilk thanks you for the quick answer. :)
    It's just the simple things which break the biggest inventions.
    @GrecKo:
    Thanks for the Note, if I'am a pure Newbie and currently stumbling around Qt and C++, I don't think it will make a big issue for me, losing some funcionality. :D

    Have all a nice day!

    1
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