qrc:/main.qml:48:35: Unable to assign QQuickRectangle to QQuickAnchorLine

[sylas]

Hi all ! Last year I built with success a quickcalculator. I used then the Linux O.S. 14. Now with my O.S 16 build fails at the moment I make it "run". I have the message I give on my title: qrc:/main.qml:48:35: Unable to assign QQuickRectangle to QQuickAnchorLine. I suppose that my new Qt Creator has some install missing. Have you an idea of what plugin is missing ?? Many thanks

[anda_skoa]

Sounds like a problem in the code.

Something like

anchors.left: parent

anchors.left: parent

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instead of

anchors.left: parent.left

anchors.left: parent.left

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i.e. passing a reference to an object to an anchor line instead of passing the anchor line of that object.

Cheers,
_

[sylas]

Here is the code. Look please at the commented line. Thanks for your help.

//main.qml
import QtQuick 2.3//2.3 sur livre
 
Rectangle {
    width: 360
    height: 200
    color: "grey"
 
    TextInput {
        id: argument1
        anchors.left: parent.left
        width: 160
        anchors.top: parent.top
        anchors.topMargin: 10
        anchors.leftMargin: 10
        anchors.rightMargin: 10
        text: "2"
        font.pointSize: 18
    }
 
    TextInput {
        id: argument2
        anchors.right: parent.right
        width: 160
        anchors.top: parent.top
        anchors.topMargin: 10
        anchors.leftMargin: 10
        anchors.rightMargin: 10
        text: "2"
        font.pointSize: 18
    }
 
    Text {
        id: result
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.top: argument2.bottom
        anchors.topMargin: 10
        anchors.leftMargin: 10
        anchors.rightMargin: 10
        text: "4"
        font.pointSize: 24
    }
 
    Row {
        id: buttonRow
        width: 317
        anchors.bottom: parent.bottom
        anchors.horizontalCenter: parent.hotizontalCenter//I added ".horizontalCenter". Now "debugging is enabled"
        anchors.bottomMargin: 20
        spacing: 20
        Button {
            id: plusButton
            operation: "+"
            onClicked: result.text = parseFloat(argument1.text) + parseFloat(argument2.text)
        }
 
        Button {
            id: minusButton
            operation: "-"
            onClicked: result.text = parseFloat(argument1.text) - parseFloat(argument2.text)
        }
 
        Button {
            id: timesButton
            operation: "*"
            onClicked: result.text = parseFloat(argument1.text) * parseFloat(argument2.text)
        }
 
        Button {
            id: divideButton
            operation: "/"
            onClicked: result.text = parseFloat(argument1.text) / parseFloat(argument2.text)
        }
    }
}

//main.qml
import QtQuick 2.3//2.3 sur livre

Rectangle {
    width: 360
    height: 200
    color: "grey"

    TextInput {
        id: argument1
        anchors.left: parent.left
        width: 160
        anchors.top: parent.top
        anchors.topMargin: 10
        anchors.leftMargin: 10
        anchors.rightMargin: 10
        text: "2"
        font.pointSize: 18
    }

    TextInput {
        id: argument2
        anchors.right: parent.right
        width: 160
        anchors.top: parent.top
        anchors.topMargin: 10
        anchors.leftMargin: 10
        anchors.rightMargin: 10
        text: "2"
        font.pointSize: 18
    }

    Text {
        id: result
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.top: argument2.bottom
        anchors.topMargin: 10
        anchors.leftMargin: 10
        anchors.rightMargin: 10
        text: "4"
        font.pointSize: 24
    }

    Row {
        id: buttonRow
        width: 317
        anchors.bottom: parent.bottom
        anchors.horizontalCenter: parent.hotizontalCenter//I added ".horizontalCenter". Now "debugging is enabled"
        anchors.bottomMargin: 20
        spacing: 20
        Button {
            id: plusButton
            operation: "+"
            onClicked: result.text = parseFloat(argument1.text) + parseFloat(argument2.text)
        }

        Button {
            id: minusButton
            operation: "-"
            onClicked: result.text = parseFloat(argument1.text) - parseFloat(argument2.text)
        }

        Button {
            id: timesButton
            operation: "*"
            onClicked: result.text = parseFloat(argument1.text) * parseFloat(argument2.text)
        }

        Button {
            id: divideButton
            operation: "/"
            onClicked: result.text = parseFloat(argument1.text) / parseFloat(argument2.text)
        }
    }
}

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[anda_skoa]

anchors.horizontalCenter defnitely needs one of the three vertical anchor lines as its value, i.e. "parent.left", "parent.right" or "parent.horizontalCenter"

Just parent, which you had previously if I understood you correctly, would not work.

Btw, your code snippet above has a typo in the second "horizontalCenter"

Cheers,
_

[sylas]

I tried the 3 cases. Now a paste of what happens with parent.horizontalCenter: QML debugging is enabled. Only use this in a safe environment.---- The problem appears onlly when I "run". No problem when it is building. It is strange this project worked well last year with my O.S Linux 14.O4. Now with my O.S. 16.04 it doesn't work.

[anda_skoa]

If you had "parent" as the value for the horizontalCenter then it just didn't report a warning, it definitely did not work.
Not having that anchor set might be ok, but then you could just remove it.

Cheers,
_

[sylas]

I removed all the line with // Now "application output" says:
Starting /home/sylvain/build-quickcalc-Qt_5_5_1_in_PATH_qt5_invalid-Debug/quickcalc...
QML debugging is enabled. Only use this in a safe environment.
Nothing wrong while building. The above message appears only when I "run". This project comes from "Application Development with Qt Creator- 2nd edition" of the book of Ray Rischpater.

[anda_skoa]

So everthing is working now?

Cheers,
_

[sylas]

Unfortunately it does not work. In the book he speeks only of two files, Button.qml and main.qml. No trace of a main.cpp. I already gave to you " main.qml " . I give you now "Button.qml". Maybe you can advance with it.

//Butoon.qml
import QtQuick 2.0
Rectangle {
    id: button
    width: 64
    height: 64
    property alias operation: buttonText.text
    signal clicked
    color: "green"
    Rectangle {
        id: shade
        anchors.fill: button;
        color: "black"; opacity: 0
    }
    Text {
        id: buttonText
        anchors.centerIn: parent;
        color: "white"
        font.pointSize: 16
    }
    MouseArea {
        id: mouseArea
        anchors.fill: parent
        onClicked: {
            button.clicked();
        }
    }
    states: State {
        name: "pressed"; when: mouseArea.pressed == true
        PropertyChanges { target: shade; opacity: .4 }
    }
}

//Butoon.qml
import QtQuick 2.0
Rectangle {
    id: button
    width: 64
    height: 64
    property alias operation: buttonText.text
    signal clicked
    color: "green"
    Rectangle {
        id: shade
        anchors.fill: button;
        color: "black"; opacity: 0
    }
    Text {
        id: buttonText
        anchors.centerIn: parent;
        color: "white"
        font.pointSize: 16
    }
    MouseArea {
        id: mouseArea
        anchors.fill: parent
        onClicked: {
            button.clicked();
        }
    }
    states: State {
        name: "pressed"; when: mouseArea.pressed == true
        PropertyChanges { target: shade; opacity: .4 }
    }
}

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[sylas]

In the bundle of codes of this project I found many files. I added one viewer.cpp and a viewer.h. In the designer mode I see the calculator very well. It seems ready for use. Now nothing about my first problem of anchor. The only problem I have now is (in Application Output): "make sure to deploy Qt with accessibility plugins". Very well but where I can find these plugins ?? Have you an idea ?? Cheers

[anda_skoa]

Unfortunately it does not work.

You have given no indication what problem you are having.

In the book he speeks only of two files, Button.qml and main.qml. No trace of a main.cpp.

You don't necessarily need any C++ files.
E.g. you could simply launch main.qml using "qmlscene" or as a "QtQuick UI" project in QtCreator.

Now nothing about my first problem of anchor.

Great.

The only problem I have now is (in Application Output): "make sure to deploy Qt with accessibility plugins".

That's not a problem unless you need accessibility support.
Do you?

Cheers,
_