如何在 QML 中操作颜色

Question

我想做这样的事情：

Item {

    property color primary_color

    Rectangle {
        color: Qt.rgba(primary_color.red/2, primary_color.green, primary_color.blue, primary_color.alpha<0.5?0.25:0.75)
    }
}

但是我怎样才能访问属性？

Answer 1

来自 http://doc.qt.io/qt-5/qml-color.html 文档：

A color type has r, g, b and a properties that refer to the red, green, blue and alpha values of the color, respectively. Additionally it has hsvHue, hsvSaturation, hsvValue and hslHue, hslSaturation, hslLightness properties, which allow access to color values in HSV and HSL color models accordingly:

Item {

    property color primary_color

    Rectangle {
        color: Qt.rgba(primary_color.r/2, primary_color.g, primary_color.b, primary_color.a<0.5?0.25:0.75)
    }
}