Customization of Qt Quick Controls should be done without coding

Qt Quick Controls are designed to be highly customizable, as documented here:
https://doc.qt.io/qt-6/qtquickcontrols-customize.html

Customization typically involves overriding key properties such as background and contentItem, for example:

import QtQuick
import QtQuick.Controls.Basic
Button {
    id: control
    text: qsTr("Button")    
    contentItem: Text {
        text: control.text
        font: control.font
        opacity: enabled ? 1.0 : 0.3
        color: control.down ? "#17a81a" : "#21be2b"
        horizontalAlignment: Text.AlignHCenter
        verticalAlignment: Text.AlignVCenter
        elide: Text.ElideRight
    }   
    background: Rectangle {
        implicitWidth: 100
        implicitHeight: 40
        opacity: enabled ? 1 : 0.3
        border.color: control.down ? "#17a81a" : "#21be2b"
        border.width: 1
        radius: 2
    }
} 

Currently, Qt Design Studio does not provide a no-code interface for editing these properties in the Properties view. As a result, users are forced to manually write QML code for even basic styling changes.

This creates a significant barrier for UI/UX designers and non-technical users, who are the audience that Qt Design Studio is meant to empower. In fact, this feature request has been raised by:

• A UI/UX design team at a customer site

• A member of an automotive OEM who wants to quickly prototype meter UIs without writing code

Proposal:

We propose that QDS introduce an intuitive, no-code way to edit properties to customize Qt Quick Controls, such as background and contentItem (e.g., via enhanced property panels or visual overrides). This will:

• Significantly lower the entry barrier for designers

• Accelerate prototyping workflows

• Increase adoption of QDS for both designers and embedded-focused developers

Impact:

Improving this experience directly aligns with Qt Design Studio's core value proposition: enabling fast, visual, designer-friendly UI development. By eliminating the need for manual coding in common customization cases, we make QDS more inclusive, efficient, and appealing to our growing design-centric user base.