Qml 无法定位自定义样式的制栓

我想给一个不倒翁我自己的风格。我宣布不倒翁是这样的：

Tumbler {
    style: MyTumblerStyle {}
    height: UIConstants.smallFontSize * 10
    width: UIConstants.smallFontSize * 3

    TumblerColumn {
        model: [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]
    }
}

TumblerStyle {
    id: root
    visibleItemCount: 5
    background: Rectangle {}
    foreground: Item {}

    frame: Item {}

    highlight: Item {}
    delegate: Item {
        id: delRoot
        implicitHeight: (control.height) / root.visibleItemCount
        Item {
            anchors.fill: parent

            Text {
                text: styleData.value
                font.pixelSize: UIConstants.smallFontSize
                font.family: UIConstants.robotoregular
                anchors.centerIn: parent
                scale: 1.0 + Math.max(0, 1 - Math.abs(styleData.displacement)) * 0.6
                color: styleData.current?UIConstants.color:"black"
                opacity: 1 - Math.abs(styleData.displacement/(root.visibleItemCount-3))
            }
        }
    }

}

Row {
    MyTumbler {}
    StandardText {
        color: UIConstants.color
        text: "Uhr"
    }
}

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Extras 1.3

ApplicationWindow {
    title: qsTr("Hello World")
    width: 300
    height: 600
    visible: true

    Column {
        anchors.centerIn: parent

        Tumbler {
            id: tumbler
            width: 30

            TumblerColumn {
                model: 25
            }

            Component.onCompleted: print(width, height, implicitWidth, implicitHeight)
        }

        Rectangle {
            width: tumbler.implicitWidth
            height: tumbler.implicitHeight
            color: "transparent"    
            border.color: "blue"

            Text {
                text: "Tumbler implicit size"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }

        Rectangle {
            width: tumbler.width
            height: tumbler.height
            color: "transparent"
            border.color: "blue"

            Text {
                text: "The size you gave"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }
    }
}

其中MyTymblerStyle的定义如下：

Tumbler {
    style: MyTumblerStyle {}
    height: UIConstants.smallFontSize * 10
    width: UIConstants.smallFontSize * 3

    TumblerColumn {
        model: [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]
    }
}

TumblerStyle {
    id: root
    visibleItemCount: 5
    background: Rectangle {}
    foreground: Item {}

    frame: Item {}

    highlight: Item {}
    delegate: Item {
        id: delRoot
        implicitHeight: (control.height) / root.visibleItemCount
        Item {
            anchors.fill: parent

            Text {
                text: styleData.value
                font.pixelSize: UIConstants.smallFontSize
                font.family: UIConstants.robotoregular
                anchors.centerIn: parent
                scale: 1.0 + Math.max(0, 1 - Math.abs(styleData.displacement)) * 0.6
                color: styleData.current?UIConstants.color:"black"
                opacity: 1 - Math.abs(styleData.displacement/(root.visibleItemCount-3))
            }
        }
    }

}

Row {
    MyTumbler {}
    StandardText {
        color: UIConstants.color
        text: "Uhr"
    }
}

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Extras 1.3

ApplicationWindow {
    title: qsTr("Hello World")
    width: 300
    height: 600
    visible: true

    Column {
        anchors.centerIn: parent

        Tumbler {
            id: tumbler
            width: 30

            TumblerColumn {
                model: 25
            }

            Component.onCompleted: print(width, height, implicitWidth, implicitHeight)
        }

        Rectangle {
            width: tumbler.implicitWidth
            height: tumbler.implicitHeight
            color: "transparent"    
            border.color: "blue"

            Text {
                text: "Tumbler implicit size"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }

        Rectangle {
            width: tumbler.width
            height: tumbler.height
            color: "transparent"
            border.color: "blue"

            Text {
                text: "The size you gave"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }
    }
}

我用它排成这样：

Tumbler {
    style: MyTumblerStyle {}
    height: UIConstants.smallFontSize * 10
    width: UIConstants.smallFontSize * 3

    TumblerColumn {
        model: [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]
    }
}

TumblerStyle {
    id: root
    visibleItemCount: 5
    background: Rectangle {}
    foreground: Item {}

    frame: Item {}

    highlight: Item {}
    delegate: Item {
        id: delRoot
        implicitHeight: (control.height) / root.visibleItemCount
        Item {
            anchors.fill: parent

            Text {
                text: styleData.value
                font.pixelSize: UIConstants.smallFontSize
                font.family: UIConstants.robotoregular
                anchors.centerIn: parent
                scale: 1.0 + Math.max(0, 1 - Math.abs(styleData.displacement)) * 0.6
                color: styleData.current?UIConstants.color:"black"
                opacity: 1 - Math.abs(styleData.displacement/(root.visibleItemCount-3))
            }
        }
    }

}

Row {
    MyTumbler {}
    StandardText {
        color: UIConstants.color
        text: "Uhr"
    }
}

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Extras 1.3

ApplicationWindow {
    title: qsTr("Hello World")
    width: 300
    height: 600
    visible: true

    Column {
        anchors.centerIn: parent

        Tumbler {
            id: tumbler
            width: 30

            TumblerColumn {
                model: 25
            }

            Component.onCompleted: print(width, height, implicitWidth, implicitHeight)
        }

        Rectangle {
            width: tumbler.implicitWidth
            height: tumbler.implicitHeight
            color: "transparent"    
            border.color: "blue"

            Text {
                text: "Tumbler implicit size"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }

        Rectangle {
            width: tumbler.width
            height: tumbler.height
            color: "transparent"
            border.color: "blue"

            Text {
                text: "The size you gave"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }
    }
}

现在，结果如下所示：

Tumbler {
    style: MyTumblerStyle {}
    height: UIConstants.smallFontSize * 10
    width: UIConstants.smallFontSize * 3

    TumblerColumn {
        model: [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]
    }
}

TumblerStyle {
    id: root
    visibleItemCount: 5
    background: Rectangle {}
    foreground: Item {}

    frame: Item {}

    highlight: Item {}
    delegate: Item {
        id: delRoot
        implicitHeight: (control.height) / root.visibleItemCount
        Item {
            anchors.fill: parent

            Text {
                text: styleData.value
                font.pixelSize: UIConstants.smallFontSize
                font.family: UIConstants.robotoregular
                anchors.centerIn: parent
                scale: 1.0 + Math.max(0, 1 - Math.abs(styleData.displacement)) * 0.6
                color: styleData.current?UIConstants.color:"black"
                opacity: 1 - Math.abs(styleData.displacement/(root.visibleItemCount-3))
            }
        }
    }

}

Row {
    MyTumbler {}
    StandardText {
        color: UIConstants.color
        text: "Uhr"
    }
}

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Extras 1.3

ApplicationWindow {
    title: qsTr("Hello World")
    width: 300
    height: 600
    visible: true

    Column {
        anchors.centerIn: parent

        Tumbler {
            id: tumbler
            width: 30

            TumblerColumn {
                model: 25
            }

            Component.onCompleted: print(width, height, implicitWidth, implicitHeight)
        }

        Rectangle {
            width: tumbler.implicitWidth
            height: tumbler.implicitHeight
            color: "transparent"    
            border.color: "blue"

            Text {
                text: "Tumbler implicit size"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }

        Rectangle {
            width: tumbler.width
            height: tumbler.height
            color: "transparent"
            border.color: "blue"

            Text {
                text: "The size you gave"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }
    }
}

如您所见，Uhr文本中心与不倒翁顶部对齐。此外，该行似乎无法识别玻璃杯的实际宽度

---

为什么?？当我不使用MyTumblerStyle时，它确实起作用。

问题不是你的样式，而是宽度分配

它有助于在这样的时间打破矩形：

Tumbler {
    style: MyTumblerStyle {}
    height: UIConstants.smallFontSize * 10
    width: UIConstants.smallFontSize * 3

    TumblerColumn {
        model: [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24]
    }
}

TumblerStyle {
    id: root
    visibleItemCount: 5
    background: Rectangle {}
    foreground: Item {}

    frame: Item {}

    highlight: Item {}
    delegate: Item {
        id: delRoot
        implicitHeight: (control.height) / root.visibleItemCount
        Item {
            anchors.fill: parent

            Text {
                text: styleData.value
                font.pixelSize: UIConstants.smallFontSize
                font.family: UIConstants.robotoregular
                anchors.centerIn: parent
                scale: 1.0 + Math.max(0, 1 - Math.abs(styleData.displacement)) * 0.6
                color: styleData.current?UIConstants.color:"black"
                opacity: 1 - Math.abs(styleData.displacement/(root.visibleItemCount-3))
            }
        }
    }

}

Row {
    MyTumbler {}
    StandardText {
        color: UIConstants.color
        text: "Uhr"
    }
}

import QtQuick 2.4
import QtQuick.Controls 1.3
import QtQuick.Extras 1.3

ApplicationWindow {
    title: qsTr("Hello World")
    width: 300
    height: 600
    visible: true

    Column {
        anchors.centerIn: parent

        Tumbler {
            id: tumbler
            width: 30

            TumblerColumn {
                model: 25
            }

            Component.onCompleted: print(width, height, implicitWidth, implicitHeight)
        }

        Rectangle {
            width: tumbler.implicitWidth
            height: tumbler.implicitHeight
            color: "transparent"    
            border.color: "blue"

            Text {
                text: "Tumbler implicit size"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }

        Rectangle {
            width: tumbler.width
            height: tumbler.height
            color: "transparent"
            border.color: "blue"

            Text {
                text: "The size you gave"
                anchors.fill: parent
                wrapMode: Text.Wrap
            }
        }
    }
}

我没有访问UIConstants的权限，所以我猜是您设置的宽度

不倒翁的隐含宽度为。这允许您为列设置单独的宽度，这对于某些列比其他列宽的情况是必要的，例如：

因此，您还应该设置列的宽度，或者最好只设置列的宽度，而不是整个玻璃杯的宽度：

这也解释了为什么文本的位置很奇怪；行可以看到30个像素，但列的宽度仍然比原来宽得多