在MouseClick上在运行时动态更改QML主题

时间:2017-06-06 12:21:19

标签: javascript qt qml qtquick2 qt5.5

我有Theme1.js,其中包含与Theme 1样式相关的属性变量,类似于主题2,Theme2.js 现在在main.qml中,如果我单击MouseArea,主题应该在Theme1和Theme2之间切换。我发现QML中不存在条件导入语句。还有其他办法吗?

Theme1.js

var color="red";
var textString="This is Theme1"

Theme2.js

var color="green";
var textString="This is Theme2"

main.qml

import QtQuick 2.3
import QtQuick.Window 2.2
import "Theme1.js" as Theme //default Theme 

Window {
    visible: true
    color:Theme.color

    MouseArea {
        anchors.fill: parent
        onClicked: {
            //Change Theme 1 to Theme 2. Basically Toggle Theme here

        }
    }

    Text {
        text: Theme.textString
        anchors.centerIn: parent
    }
}

1 个答案:

答案 0 :(得分:4)

首先,建议不要使用js - 库来存储值,稍后您将绑定。 This is as it is not advised to bind to var-types。您应该考虑将您的库转换为QtObject - 单例。

仅将库用作函数库。

要更改主题,您可能只有一个单身Style

pragma Singleton
import QtQuick 2.0

QtObject {
    property Theme current: theme1
    property Theme theme1: Theme1 { }
    property Theme theme2: Theme2 { }
}

Theme.qml 类似于:

import QtQuick 2.0
QtObject {
    property color color0
    property color color1
    property color colorX
}

然后 Theme1.qml

import QtQuick 2.0
Theme {
    color0: 'green'
    color1: 'blue'
    colorX: 'red'
}

Theme2.qml

import QtQuick 2.0
Theme {
    color0: 'red'
    color1: 'pruple'
    colorX: 'yellow'
}

然后将属性绑定到color: Style.current.colorX

要更改样式,请将另一个主题指定给Style.current

编辑: 使用中间变量来缩短值的路径可能是一种优化。它增加了不需要使用Style.current.color0但至少使用Style.color0的便利性。

您可以将此用作 Style.qml

pragma Singleton
import QtQuick 2.0

Theme { // Use Theme instead of QtObject
    property Theme current: theme1
    property Theme theme1: Theme1 { }
    property Theme theme2: Theme2 { }

    // Bind the `Theme`s properties as intermediate variables to the current Theme.
    color0: (current && current.color0 ? current.color0 : 'defaultColor0')
    color1: (current && current.color1 ? current.color1 : 'defaultColor1')
    colorX: (current && current.colorX ? current.colorX : 'defaultColorX')
}