UI 组件：表盘控件范例

文件：

• declarative/ui-components/dialcontrol/dialcontrol.svg
• declarative/ui-components/dialcontrol/qml/dialcontrol/dialcontrol.qml
• declarative/ui-components/dialcontrol/qml/dialcontrol/content/Dial.qml
• declarative/ui-components/dialcontrol/qml/dialcontrol/content/QuitButton.qml
• declarative/ui-components/dialcontrol/main.cpp
• declarative/ui-components/dialcontrol/dialcontrol.pro
• declarative/ui-components/dialcontrol/dialcontrol.qmlproject