Thermostat

運行範例

要運行範例從 Qt Creator ，打開 歡迎 模式，然後選擇範例從 範例 。更多信息，見 Qt Creator：教程：構建並運行 .

Responsive Design

The application has support for a variety of display sizes. It can scale dynamically when the user changes the window size, or the application will select the correct sizes based on the available display on mobile targets. Constants.qml contains properties that specify the display size and control which layout is currently in use:

    property bool isBigDesktopLayout: layout === Constants.Layout.Desktop
    property bool isSmallDesktopLayout: layout === Constants.Layout.SmallDesktop
    property bool isMobileLayout: layout === Constants.Layout.Mobile
    property bool isSmallLayout: layout === Constants.Layout.Small
						

在 App.qml , the properties are bound to the window height and width at application startup:

    Component.onCompleted: {
        Constants.layout = Qt.binding(() => {
            let tall = window.height >= window.width
            if (window.width >= 1440 && window.height >= 520)
                return Constants.Layout.Desktop
            if (window.width >= 1024 && window.height >= 768)
                return Constants.Layout.SmallDesktop
            if (tall || (window.width >= 600 && window.height >= 380))
                return Constants.Layout.Mobile
            return Constants.Layout.Small
        })
    }
						

The states are then used to control the components' properties, such as width, height, fontSize, position, and layout (column or row).

    states: [
        State {
            name: "bigDesktopLayout"
            when: Constants.isBigDesktopLayout
            PropertyChanges {
                target: statistics
                leftPadding: 53
                rightPadding: 53
                topPadding: 23
                bottomPadding: 43
            }
            PropertyChanges {
                target: scrollView
                isBackgroundVisible: false
                delegateWidth: 350
                delegateHeight: 182
                statisticsChartWidth: grid.width
                statisticsChartHeight: 647
            }
            PropertyChanges {
                target: grid
                width: 1100
            }
        },
        State {
            name: "smallDesktopLayout"
            when:  Constants.isSmallDesktopLayout
            PropertyChanges {
                target: statistics
                leftPadding: 53
                rightPadding: 53
                topPadding: 23
                bottomPadding: 43
            }
            PropertyChanges {
                target: scrollView
                isBackgroundVisible: false
                delegateWidth: 290
                delegateHeight: 182
                statisticsChartWidth: grid.width
                statisticsChartHeight: 541
            }
            PropertyChanges {
                target: grid
                width: 918
            }
        },
        State {
            name: "mobileLayout"
            when: Constants.isMobileLayout
            PropertyChanges {
                target: statistics
                leftPadding: 0
                rightPadding: 0
                topPadding: 0
                bottomPadding: 0
            }
            PropertyChanges {
                target: scrollView
                isBackgroundVisible: false
                delegateWidth: 327
                delegateHeight: 110
                statisticsChartWidth: 346
                statisticsChartHeight: 383
            }
        },
        State {
            name: "smallLayout"
            when: Constants.isSmallLayout
            PropertyChanges {
                target: statistics
                leftPadding: 0
                rightPadding: 0
                topPadding: 0
                bottomPadding: 0
            }
            PropertyChanges {
                target: scrollView
                isBackgroundVisible: true
                delegateWidth: 332
                delegateHeight: 90
                statisticsChartWidth: 420
                statisticsChartHeight: 240
            }
        }
    ]
						

Source files

範例工程 @ code.qt.io

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