Qt QML ComboBox 覆盖滚轮事件

Question

有没有办法覆盖 ComboBox MouseArea 以忽略滚轮事件而不是更改当前索引？ ComboBox 本身无法更改滚轮焦点行为。到目前为止，我已经尝试使用以下代码覆盖 CB MouseArea 中的 onWheel:

ComboBox {
  Component.onCompleted: {
    for (var i = 0; i < combobox_ctrl.children.length; ++i) {
      console.log(combobox_ctrl.children[i])
      console.log(combobox_ctrl.children[i].hasOwnProperty('onWheel'))

      if (combobox_ctrl.children[i].hasOwnProperty('onWheel')) {
        console.log(combobox_ctrl.children[i]['onWheel'])
        combobox_ctrl.children[i]['onWheel'] = function() { console.log("CB on wheel!") }
        //combobox_ctrl.children[i]onWheel = function() { console.log("CB on wheel!") 
        //combobox_ctrl.children[i].destroy()
      }
    }
  }
}

但我明白了

TypeError: Cannot assign to read-only property "wheel"

有没有人能够在 Qml 的 ComboBox 上禁用轮子事件？

//编辑

例如，在 Slider 控件中，我能够像这样删除滚轮事件处理:

Slider {
  Component.onCompleted: {
    for (var i = 0; i < slider.children.length; ++i) {
      console.log(slider.children[i])
      if (slider.children[i].hasOwnProperty("onVerticalWheelMoved") && slider.children[i].hasOwnProperty("onHorizontalWheelMoved")) {
        console.log("Found wheel area!")
        slider.children[i].destroy()
      }
    }
  }
}

但在 slider 中 WheelArea 不负责处理“点击”事件。

Answer 1

您可以将 MouseArea 放在 ComboBox 和钢轮事件上。

ComboBox {
    anchors.centerIn: parent
    model: [ "Banana", "Apple", "Coconut" ]
    MouseArea {
        anchors.fill: parent
        onWheel: {
            // do nothing
        }
        onPressed: {
            // propogate to ComboBox
            mouse.accepted = false;
        }
        onReleased: {
            // propogate to ComboBox
            mouse.accepted = false;
        }
    }
}