用例 - 样式和主题支持

Styling with QML involves creating a visual type and binding that to a property or by directly assigning a value to a property. For types that incorporate Qt Quick's delegates the visual type attaches to the delegate 特性。

当使用 Qt Quick Controls , the controls automatically set the appropriate style from the respective platforms .

使用样式化 QML 类型

The controls 拥有 style property to which the styling types bind. The controls have a corresponding styling type from the Qt Quick Controls Styles 模块。例如， Button 拥有 ButtonStyle 类型和 Menu 拥有 MenuStyle type. The styling types provide properties applicable to their respective controls such as the background, label, or for some controls, the cursor appearance.

Button {
    text: qsTr("Hello World")
    style: ButtonStyle {
        background: Rectangle {
            implicitWidth: 100
            implicitHeight: 25
            border.width: control.activeFocus ? 2 : 1
            border.color: "#FFF"
            radius: 4
            gradient: Gradient {
                GradientStop { position: 0 ; color: control.pressed ? "#ccc" : "#fff" }
                GradientStop { position: 1 ; color: control.pressed ? "#000" : "#fff" }
            }
        }
   }

注意： Qt Quick Controls Styles 在 Qt 5.1 引入且要求 Qt Quick 2.1.

访问系统调色板

The SystemPalette type provides information about the system's palette information. QML applications can use this information to set the appearance of visual types to match the native look-and-feel. In addition, on desktop platforms, different color palettes are employed when changing states, for example, when the application loses keyboard focus.

当使用 controls ，系统颜色已被使用。