How to detect when the user has resized the window?

Jack Hill

Hi everyone, I'm writing an app where the main window is usually resized based on the size of the content currently shown. But if the user has resized the window, then the window enters a "fixed resize" mode, where the app should not resize itself automatically.

Is it possible to detect when the user has resized a window?

This is the code that I've tried so far:

import QtQuick 2.0
import QtQuick.Controls 2.15 as QQC2

QQC2.ApplicationWindow {
    id: root
    visible: true
    width: 300
    height: 240

    color: "steelblue"

    property bool resizedByApp: false
    property bool fixedSizeMode: false

    onFixedSizeModeChanged: console.log("fixedSizeModeChanged", fixedSizeMode)

    onWidthChanged: {
        if (!resizedByApp) {
            fixedSizeMode = true
        }
    }

    onHeightChanged: {
        if (!resizedByApp) {
            fixedSizeMode = true
        }
    }

    function resizeApp(newWidth, newHeight) {
        if (fixedSizeMode) {
            return
        }
        root.resizedByApp = true
        width = newWidth
        height = newHeight
        root.resizedByApp = false
    }

    QQC2.Button {
        text: "Resize me"
        onClicked: resizeApp(500, 500)
    }
}

but when I click on the button, the window is resized before resizedByApp is set to true.

(btw I'm using Qt 5.15.9)