RE: QML id usage

6thC

What about creating some objects states (and maybe transitions too)?
https://wiki.qt.io/QML_States_Controlling
instead of messing with the insides of another class you are utilizing a defined state/interface and you design your module to handle the various state configurations/behaviors expected of it.

Naveen_D

@6thC I am using voice recognition over here based on the voice i am doing some changes is it possible using states ???

6thC

Well, I don't know the conditions to change states, that would be up to you. But sure. I think. It's possible I misunderstand or didn't read what you want enough.

I use states for changing the gui, not images but color and animations based on sensor's numeric values.

states:
  [
      State { name: "inSpec";
          PropertyChanges { target: indicator; color: hudGreen;  }     
      },
      State { name: "warning";
          PropertyChanges { target: indicator; color: "gold";        }
      },
      State { name: "maximum";
          PropertyChanges { target: indicator; color: "red";         }
      }

  transitions: [
      Transition {
          from: "maximum"
          to: "inSpec"
          SequentialAnimation {
              loops: 1;
              ColorAnimation { duration: 300; from: "red";        to: hudGreen; }
              ColorAnimation { duration: 300; from: hudGreen; to: "transparent";}
          }
      },
      Transition {
          from: "warning"
          to: "inSpec"
          ColorAnimation { target: root; duration: 300}
          ColorAnimation { duration: 300; from: "red";        to: hudGreen; }
          ColorAnimation { duration: 300; from: hudGreen; to: "transparent";}
      },
...

And I use this in a method where I pass a control as an argument (with the states and transitions in it) and the sensor value like:

function adjustState(control, value){
... inSpec expression 
              control.state =  "inSpec";
... warning expression 
              control.state =  "warning";
... maximum expression 
              control.state =  "maximum";

Naveen_D

I tried using property aliasing...but no output can anyone pls guide me further in this matter....it would be helpful.

p3c0

@Naveen_D You need to provide a very minimal complete code of your application which can reproduce the problem. This would be more useful for others to understand.

Naveen_D

@p3c0 ya sure here is the code,

main.qml

import QtQuick 2.7
import QtQuick.Window 2.2
import QtQuick.Layouts 1.2
import QtQuick 2.5


Window {
    //    flags: Qt.FramelessWindowHint

    title: qsTr("Infotainment")
    width: (Screen.width/4)+200
    height: (Screen.height/4)
    visible: true

    ExampleRect1
    {
        id: rect1id
        visible: false
    }

    ExampleRect2
    {
        id: rect2id
        visible: false
    }
    Row
    {
        id: rectrow
        spacing: 100
        anchors.centerIn: parent
        Rectangle {
            id: myRect
            width: 150; height: 100
            color: "transparent"
            border.color: "black"
            Text {
                id: rect1text
                text: qsTr("Rectangle1")
                font.bold: true
                font.pixelSize: 24
                color: "red"
                anchors.centerIn: parent
            }

            MouseArea {
                id: mouseArea
                anchors.fill: parent
                onClicked: {
                    rect1id.visible= true
                    rectrow.visible = false
                    rect2id.visible= false
                }
            }
        }

        Rectangle {
            id: myRect2
            width: 150; height: 100
            color: "transparent"
            border.color: "black"
            Text {
                id: rect2text
                text: qsTr("Rectangle2")
                font.bold: true
                font.pixelSize: 24
                color: "blue"
                anchors.centerIn: parent
            }

            MouseArea {
                id: mouseArea2
                anchors.fill: parent
                onClicked: {
                    rect2id.visible= true
                    rectrow.visible= false
                    rect1id.visible= false
                }
            }
        }
    }
}

ExampleRect1.qml

import QtQuick 2.0
import QtQuick.Window 2.2

Rectangle{
    id: mainRect
    width: (Screen.width/4)+200
    height: (Screen.height/4)
    visible: false

    property alias imgSource : img.source


    Rectangle{
       id: imgRect
       implicitHeight: 100; implicitWidth: 150
       anchors.centerIn: parent

       Image {
           id: img
           source: "qrc:/PlayIcon.png"
       }
    }
}

RectExample2.qml

import QtQuick 2.0
import QtQuick.Window 2.2
import QtQuick.Layouts 1.2
import QtQuick 2.5

Rectangle{
    id :mainRect
    width: (Screen.width/4)+200
    height: (Screen.height/4)

    ExampleRect1{
        id:exampleRect1Object
    }

    Rectangle{
        id: voicerect
        implicitHeight: 100; implicitWidth: 150
        anchors.centerIn: parent
        color: "red"

        Text {
            id: voiceText
            text: qsTr("Voice Recognition")
            anchors.centerIn: parent
            font.pixelSize: 18
        }

        MouseArea{
            id: voicemousearea
            anchors.fill: parent
            onClicked: {
                rect1id.visible =true
                exampleRect1Object.imgSource= "qrc:/pauseIcon.png"
                mainRect.visible= false
            }
        }
    }
}

p3c0

@Naveen_D Ok. And what do you require in this example ?

Naveen_D

@p3c0
In the above example, in ExampleRect2.qml i have created an object of ExampleRect1.qml

onClicked: {
rect1id.visible =true
exampleRect1Object.imgSource= "qrc:/pauseIcon.png"
mainRect.visible= false
}

using that object i am changing the image set in exampleRect1.qml but the image remains same, it will not change...

p3c0

@Naveen_D AFAICS you are creating 2 instances of ExampleRect1, one is in main.qml and other is in ExampleRect2.qml and you are trying to update this instance instead of one in main.qml

Naveen_D

@p3c0 Ya i got the output...thanks

p3c0

@Naveen_D Great!