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Maximize application on display 2 when existing

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  • jpnurmiJ jpnurmi

    Looks like QTBUG-60893 which was marked fixed in Qt 5.9.1. Which version of Qt are you using?

    Oh, btw, I forgot to mention that you can use Window::visibility to maximize the window:

    visibility: Window.Maximized
    
    ODБOïO Offline
    ODБOïO Offline
    ODБOï
    wrote on last edited by
    #7

    @jpnurmi said in Maximize application on display 2 when existing:

    visibility: Window.Maximized

    Hello, do visibility : Window::Maximized or visibility : "Maximized"
    LA

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    • F Offline
      F Offline
      filipdns
      wrote on last edited by
      #8

      oh no qt used is the 5.9.2 then no reason to get this error...

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      • F Offline
        F Offline
        filipdns
        wrote on last edited by
        #9

        I got same error under QT 5.10...

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        • jpnurmiJ Offline
          jpnurmiJ Offline
          jpnurmi
          wrote on last edited by
          #10

          Works for me with Qt 5.9.3 and 5.10.0. What did you import? How does the relevant part of the code look like, that you're trying to run?

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          • F Offline
            F Offline
            filipdns
            wrote on last edited by
            #11

            I'm using stackview main qml is like that:

            import QtQuick 2.9
            import QtQuick.Controls 2.1
            import QtQuick.Window 2.3
            import QtQuick.Controls.Styles 1.1
            import QtQuick.Controls 1.4
            
            ApplicationWindow {
                id: window
                visible: true   // this is mandatory
                visibility: Window.Maximized
                screen: Qt.application.screens[1] || null
            
                StackView {
                    id: stackView
                    //y:60
                    anchors.fill: parent
                    initialItem: GardePage {
                        header: ToolBar {
                            width: parent.width
                            height: 60
                            style: ToolBarStyle {
                                    padding {
                                        left: 8
                                        right: 8
                                        top: 3
                                        bottom: 3
                                    }
                                    background: Rectangle {
                                        gradient: Gradient {
                                            GradientStop { position: 0 ; color: "black" }
                                            GradientStop { position: 1 ; color: "green" }
                                        }
                                    }
                                }
            
                            Label {
                                id: pageTitle
                                text: "KARDEX DU SIA DE L'IGN "
                                textFormat: Text.AutoText
                                fontSizeMode: Text.VerticalFit
                                font.pixelSize: 50
                                color: "lightgrey"
                                anchors.centerIn: parent
                                font.family: "Times New Roman"
                                font.bold: true
                                font.italic: true
            
                            }
                        }
                    }
                }
            }
            
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            • F Offline
              F Offline
              filipdns
              wrote on last edited by
              #12

              you probably see I'm importing 2 QtQuick.Controls, the 1.4 and the 2.1, It's not an error, don't ask me why but some functions work with one and other with the other, 2.1 don't take all function of the 1.4...

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              • jpnurmiJ Offline
                jpnurmiJ Offline
                jpnurmi
                wrote on last edited by
                #13

                It's fine to import QtQuick.Controls 1.x and QtQuick.Controls 2.x in the same file, but only if you specify namespaces to avoid conflicts. In this particular QML file, you're not actually using QtQuick.Controls 2.x for anything. The ApplicationWindow, StackView, ToolBar, and Label types provided by QtQuick.Controls 2.x are all overridden by the QtQuick.Controls 1.x import that comes later.

                The correct way to mix QQC1 and QQC2:

                import QtQuick.Controls 1.x as C1
                import QtQuick.Controls 2.x as C2
                
                C2.ApplicationWindow {
                    // ...
                    C1.ToolBar {
                        // ...
                    }
                    // ...
                }
                

                How you call the namespaces is up to you, but as long as at least one of the overlapping imports has a namespace, you avoid a lot of confusion. However, I don't see anything in this file that cannot be done with Qt Quick Controls 2. The changes are minimal:

                import QtQuick 2.9
                import QtQuick.Controls 2.1
                import QtQuick.Window 2.3
                
                ApplicationWindow {
                    id: window
                    visible: true   // this is mandatory
                    visibility: Window.Maximized
                    screen: Qt.application.screens[1] || null
                
                    StackView {
                        id: stackView
                        anchors.fill: parent
                        initialItem: GardePage {
                            header: ToolBar {
                                width: parent.width
                                height: 60
                                leftPadding: 8
                                rightPadding: 8
                                topPadding: 3
                                bottomPadding: 3
                                background: Rectangle {
                                    gradient: Gradient {
                                        GradientStop { position: 0 ; color: "black" }
                                        GradientStop { position: 1 ; color: "green" }
                                    }
                                }
                
                                Label {
                                    id: pageTitle
                                    text: "KARDEX DU SIA DE L'IGN "
                                    textFormat: Text.AutoText
                                    fontSizeMode: Text.VerticalFit
                                    font.pixelSize: 50
                                    color: "lightgrey"
                                    anchors.centerIn: parent
                                    font.family: "Times New Roman"
                                    font.bold: true
                                    font.italic: true
                                }
                            }
                        }
                    }
                }
                
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                • F Offline
                  F Offline
                  filipdns
                  wrote on last edited by
                  #14

                  Thank you very much.

                  Then now, with [1] the application start correctly on screen 2 fine, but with [0] or [2] the application start on screen were my mouse is

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                  • jpnurmiJ Offline
                    jpnurmiJ Offline
                    jpnurmi
                    wrote on last edited by
                    #15

                    This statement:

                    screen: Qt.application.screens[1] || null
                    

                    means that the second screen will be set, or if not available (no such entry in the array == undefined) it assigns null instead to avoid:

                    Cannot assign undefined to Screen
                    

                    It’s an example. Adapt it to your needs.

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                    • F Offline
                      F Offline
                      filipdns
                      wrote on last edited by filipdns
                      #16

                      yes understood but If I want to have 2 qt applications and force 1 in screen 1 and other on screen 2, how do that?
                      I try :

                      screen: Qt.application.screens[0]

                      but it's not working

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                      • jpnurmiJ Offline
                        jpnurmiJ Offline
                        jpnurmi
                        wrote on last edited by jpnurmi
                        #17

                        On which platform? If screen: Qt.application.screens[0] doesn't place the window on the primary screen, you should report a bug at bugreports.qt.io and provide details about the platform. Provide a minimal but complete runnable test case without references to any GardePage and others. Explain what you are doing, what you expect to happen, and what you get instead.

                        I don't have access to a suitable environment right now to be able to test, but out of curiosity, does it make any difference if you assign the screen in Component.onCompleted?

                        Window {
                            Component.onCompleted: screen = Qt.application.screens[0]
                        }
                        

                        Also, have you inspected, what is the contents of the Qt.application.screens array, actually?

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                        • F Offline
                          F Offline
                          filipdns
                          wrote on last edited by
                          #18

                          no difference with

                          Component.onCompleted: screen = Qt.application.screens[0]
                          
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                          • jpnurmiJ Offline
                            jpnurmiJ Offline
                            jpnurmi
                            wrote on last edited by
                            #19

                            What about in C++?

                            #include <QtGui>
                            #include <QtDebug>
                            
                            int main(int argc, char *argv[])
                            {
                                QGuiApplication app(argc, argv);
                            
                                QWindow window;
                                window.resize(100, 100);
                                window.setScreen(app.screens().value(1));
                                window.show();
                            
                                qDebug() << "available:" << app.screens();
                                qDebug() << "primary:" << app.primaryScreen();
                                qDebug() << "window:" << window.screen();
                            
                                return app.exec();
                            }
                            
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                            • jpnurmiJ jpnurmi

                              What about in C++?

                              #include <QtGui>
                              #include <QtDebug>
                              
                              int main(int argc, char *argv[])
                              {
                                  QGuiApplication app(argc, argv);
                              
                                  QWindow window;
                                  window.resize(100, 100);
                                  window.setScreen(app.screens().value(1));
                                  window.show();
                              
                                  qDebug() << "available:" << app.screens();
                                  qDebug() << "primary:" << app.primaryScreen();
                                  qDebug() << "window:" << window.screen();
                              
                                  return app.exec();
                              }
                              
                              F Offline
                              F Offline
                              filipdns
                              wrote on last edited by filipdns
                              #20

                              @jpnurmi debug say:
                              available: (QScreen(0x3923528, name="\\.\DISPLAY1"), QScreen(0x39236b0, name="\\.\DISPLAY2"))
                              primary: QScreen(0x3923528, name="\\.\DISPLAY1")
                              window: QScreen(0x3923528, name="\\.\DISPLAY1")

                              or

                              available: (QScreen(0x36b0f30, name="\\.\DISPLAY1"), QScreen(0x36b1160, name="\\.\DISPLAY2"))
                              primary: QScreen(0x36b0f30, name="\\.\DISPLAY1")
                              window: QScreen(0x36b1160, name="\\.\DISPLAY2")

                              following mouse position window: QScreen switch to DISPLAY1 or DISPLAY2
                              changing
                              window.setScreen(app.screens().value(0));
                              to
                              window.setScreen(app.screens().value(1));
                              nothing change

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