About optimizing Text $updateImplicit.

[Gaubee]

I'm trying to optimize the performance of the $updateImplicit function in Text. When the content of the text is only plain text rather than HTML, use canvas measureText to replace the DOM's offsetWidth calculation properties. But this is only targeted optimization, it means that the use of frequent changes in the content of the Text, need to follow a best practice(no HTML but text) to get this optimization.

Test Code

import QtQuick 2.0

Item {
     Rectangle {
         id: rect
         anchors.centerIn:parent
         width: 300
         height: 300
         color: "red"

         NumberAnimation on width{
             id : ani_width
             from: 300
             to: 100
             duration: 1000
             running:false
         }
         NumberAnimation on height{
             id : ani_height
             from: 300
             to: 100
             duration: 1000
             running:false
         }
         Text{
             id:color_info
             text:[rect.width,rect.height].join()
             anchors.centerIn: parent
         }
         Text{
             anchors.top: color_info.bottom
             text:[color_info.implicitWidth,color_info.implicitHeight].join(',')
         }
         MouseArea{
             onClicked:{
                 ani_width.running = !ani_width.running
                 ani_height.running = !ani_height.running
             }
             anchors.fill: parent;
         }
     }
}

SCREENSHOT

NEWEST

OLD

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@ChALkeR If you think this targeted optimization and tell the user best practices are valuable, I will create a pull-request. Or we can find a better optimization program.