How to auto size font on TextInput or TextField?

[filipdns]

Hello,

using TextInput in customized Combocox, I want the text adjusted following content.

Original code is:

Rectangle{
        width:control.width-control.indicator.width
        height:control.height
        anchors.left:control.left
        color:"transparent"
        border.width:1
        border.color:"black"
        radius: 2
        clip: true
        TextInput {
            id:textInputItem
            anchors.fill:parent
            focus: true
            activeFocusOnPress: true
            activeFocusOnTab: true
            padding : 5
            rightPadding: 5
            color: "black"
            leftPadding: 5
            selectByMouse: true
            text: control.displayText
            font.pixelSize:20
            verticalAlignment: Text.AlignVCenter
            horizontalAlignment: Text.AlignHCenter
        }
    }

I tryed many solution like onTextChanged: {scale= Math.min(1, width/contentWidth)} or
onTextChanged: {font.pixelSize= Math.min(1, width/contentWidth)} but the size not change all the time, don't know why and scale change text size but also text width, then all text is not visible, that not solving the problem...

Could you help me?

Thanks a lot

[filipdns]

@filipdns here is what I did waiting better solution...

FontMetrics  {
            id: textMetrics
            font.pixelSize:20
        }
        TextInput {
            id:textInputItem
            anchors.fill:parent
            focus: true
            activeFocusOnPress: true
            activeFocusOnTab: true
            padding : 5
            rightPadding: 5
            color: "black"
            leftPadding: 5
            selectByMouse: true
            text: control.displayText
            font.pixelSize:20
            verticalAlignment: Text.AlignVCenter
            horizontalAlignment: Text.AlignHCenter
            onTextChanged: { font.pixelSize=20*Math.min(1,width/(textMetrics.advanceWidth(text)*1.4));textMetrics.font.pixelSize=font.pixelSize}
        }