Qt5中QML自定义环形菜单/环形选择框的实现
作者：龚建波
本文主要介绍了Qt5中QML自定义环形菜单/环形选择框的实现，文中通过示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
Qt5 中本身提供了扇形菜单 PieMenu，属于 QtQuick.Extras 模块，这个模块是拓展自 QtQuick.Control1 的，QtQuick.Control1 在 Qt5 高版本被废弃，并在 Qt6 移除。
不过我们也可以用 QtQuick.Control2 的组件自定义样式来实现环形或扇形的菜单和选择框。主要思路就是使用 PathView 来替换默认的 ListView，再改下弹框的背景样式。
ItemDelegate 需要设置给 ComboBox 或者 Menu，而不是 View。最好用 Button 的相关类型（默认是 ItemDelegate 类型），因为组件默认这些小部件是 Button 类型，内部 cast 成按钮来处理的。而且用按钮就不用自己处理下拉框 currentIndex，内部会自己处理，这也避免了我们在这个 delegate 对 currentIndex 赋值后导致其属性绑定失效的问题。
QQuickAction *QQuickMenu::actionAt(int index) const
{
Q_D(const QQuickMenu);
QQuickAbstractButton *item = qobject_cast<QQuickAbstractButton *>(d->itemAt(index));
if (!item)
return nullptr;
return item->action();
}自定义的时候遇到一点状况，就是 PathView 替代 ListView 作为 Menu 的 contentItem 后，Menu 的 contentData 和 contentModel 始终会多一个表示高亮的 Item，这样环形路径就有个缺口，目前我只能将显示的 Item 个数减去一个来使显示效果正常。
contentItem: PathView {
model: control.contentModel
//把PathView放Menu，会有一个高亮Item被放到contentModel，减去
pathItemCount: control.count > 0 ? control.count - 1 : 0
//... ...
}Demo 链接：https://github.com/gongjianbo/MyTestCode2021/tree/master/Qml/TestQml_20220313_PathView
主要代码：
import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12
Window {
width: 640
height: 480
visible: true
title: qsTr("PathView")
Row {
anchors.centerIn: parent
spacing: 20
MyComboBox {
model: 10
}
Button {
width: 60
height: 30
text: "menu"
background: Rectangle {
radius: 15
color: "red"
border.color: "black"
}
onClicked: {
menu.popup()
}
MyMenu {
id: menu
anchors.centerIn: parent
Action { text: "1" }
Action { text: "2" }
Action { text: "3" }
Action { text: "4" }
Action { text: "5" }
Action { text: "6" }
Action { text: "7" }
Action { text: "8" }
Action { text: "9" }
Action { text: "10" }
}
}
}
}import QtQuick 2.12
import QtQuick.Controls 2.12
//环形选择框
//龚建波 2022-03-13
//note：弹框为pop会被限制在window内
ComboBox {
id: control
implicitWidth: 30
implicitHeight: 30
opacity: 0.9999
delegate: ItemDelegate {
width: 30
height: width
padding: 0
background: Rectangle {
radius: width / 2
color: "green"
border.color: "black"
}
contentItem: Text {
text: modelData
padding: 0
verticalAlignment: Text.AlignVCenter
horizontalAlignment: Text.AlignHCenter
}
}
contentItem: Text {
text: control.displayText
padding: 0
verticalAlignment: Text.AlignVCenter
horizontalAlignment: Text.AlignHCenter
}
indicator: null
background: Rectangle {
radius: 15
color: "green"
border.color: "black"
}
popup: Popup {
id: pop
width: 200
height: width
anchors.centerIn: parent
margins: 0
padding: 0
//pathview环形的角度范围和延申半径
property int angle: 1
property int spread: 1
//pop弹出和隐藏时的过渡动画
enter: Transition {
ParallelAnimation {
NumberAnimation { property: "angle"; from: 1; to: 360; duration: 500 }
NumberAnimation { property: "spread"; from: 1; to: 100; duration: 500 }
}
}
exit: Transition {
ParallelAnimation {
NumberAnimation { property: "angle"; from: 360; to: 1; duration: 500 }
NumberAnimation { property: "spread"; from: 100; to: 1; duration: 500 }
}
}
background: Item { }
contentItem: PathView {
model: control.popup.visible ? control.delegateModel : null
//currentIndex: control.highlightedIndex
//highlightRangeMode: PathView.NoHighlightRange
interactive: false
path: Path {
//一个圆环路径
PathAngleArc {
centerX: 100; centerY: 100
radiusX: pop.spread; radiusY: pop.spread
moveToStart: true
startAngle: 0
sweepAngle: pop.angle
}
}
}
}
}import QtQuick 2.12
import QtQuick.Controls 2.12
//环形菜单
//龚建波 2022-03-13
//note：弹框为pop会被限制在window内
Menu {
id: control
implicitWidth: 250
implicitHeight: 250
margins: 0
padding: 0
//pathview环形的角度范围和延申半径
property int angle: 1
property int spread: 1
//pop弹出和隐藏时的过渡动画
enter: Transition {
ParallelAnimation {
NumberAnimation { property: "angle"; from: 1; to: 360; duration: 500 }
NumberAnimation { property: "spread"; from: 1; to: 100; duration: 500 }
}
}
exit: Transition {
ParallelAnimation {
NumberAnimation { property: "angle"; from: 360; to: 1; duration: 500 }
NumberAnimation { property: "spread"; from: 100; to: 1; duration: 500 }
}
}
delegate: MenuItem {
id: item
width: 30
height: width
padding: 0
spacing: 0
indicator: null
arrow: null
background: Rectangle {
radius: width / 2
color: "red"
border.color: "black"
}
contentItem: Text {
text: item.text
padding: 0
verticalAlignment: Text.AlignVCenter
horizontalAlignment: Text.AlignHCenter
}
}
contentItem: PathView {
implicitWidth: 250
implicitHeight: 250
model: control.contentModel
//把PathView放Menu，会有一个高亮Item被放到contentModel，减去
pathItemCount: control.count > 0 ? control.count - 1 : 0
//currentIndex: control.currentIndex
//highlightRangeMode: PathView.NoHighlightRange
interactive: false
path: Path {
//一个圆环路径
PathAngleArc {
centerX: 125; centerY: 125
radiusX: control.spread; radiusY: control.spread
moveToStart: true
startAngle: 0
sweepAngle: control.angle
}
}
}
background: Item { }
}到此这篇关于Qt5中QML自定义环形菜单/环形选择框的实现的文章就介绍到这了,更多相关Qt5 QML环形菜单内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！