UIElement.TransformToVisual(UIElement) 方法

參考

定義

命名空間:: Windows.UI.Xaml

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

編輯

傳回轉換物件，這個物件可用來將座標從 UIElement 轉換成指定的物件。

public:
 virtual GeneralTransform ^ TransformToVisual(UIElement ^ visual) = TransformToVisual;

GeneralTransform TransformToVisual(UIElement const& visual);

public GeneralTransform TransformToVisual(UIElement visual);

function transformToVisual(visual)

Public Function TransformToVisual (visual As UIElement) As GeneralTransform

參數

visual: UIElement

要與目前物件比較的物件，以取得轉換的目的。如果此參數為 Null，則會使用 XAML 樹狀結構的根目錄。

傳回

GeneralTransform

轉換資訊做為物件。呼叫這個物件上的方法以取得實際轉換。

範例

此範例示範呼叫 TransformToVisual 的案例，以便解譯不是事件傳送者之元素座標參考框架中的 PointerPoint 座標。在這裡，此方法會 queryPointer 先存取與傳送者相關的座標， (這是方法第一行的 GetCurrentPoint 呼叫) ，但稍後會使用 TransformToVisual，將點座標轉換成 XAML 中實際有數層內含專案的版面配置容器參考框架 page 。若要查看此程式碼的更多內容 (包括查看 queryPointer 如何在 UI 中顯示結果，以及呼叫) 時，請參閱處理指標輸入主題中顯示的完整程式碼範例。

    <Page
    x:Class="PointerInput.MainPage"
    IsTabStop="false"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:PointerInput"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Name="page">

    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="150" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="320" />
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Canvas Name="Container" 
                Grid.Column="0"
                Grid.Row="1"
                HorizontalAlignment="Center" 
                VerticalAlignment="Center" 
                Margin="0,0,0,0" 
                Height="320"  Width="640">
            <Rectangle Name="Target" 
                       Fill="#FF0000" 
                       Stroke="Black" 
                       StrokeThickness="0"
                       Height="320" Width="640" />
        </Canvas>
        <TextBox Name="eventLog" 
                 Grid.Column="1"
                 Grid.Row="0"
                 Grid.RowSpan="3" 
                 Background="#000000" 
                 TextWrapping="Wrap" 
                 Foreground="#FFFFFF" 
                 ScrollViewer.VerticalScrollBarVisibility="Visible" 
                 BorderThickness="0"/>
    </Grid>
</Page>

<Page
    x:Class="PointerInput.MainPage"
    IsTabStop="false"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:PointerInput"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Name="page">

    <Grid Background="{StaticResource ApplicationForegroundThemeBrush}">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="69.458" />
            <ColumnDefinition Width="80.542"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="320" />
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <Canvas Name="Container" 
                Grid.Column="0"
                Grid.Row="1"
                HorizontalAlignment="Center" 
                VerticalAlignment="Center" 
                Margin="245,0" 
                Height="320"  Width="640">
            <Rectangle Name="Target" 
                       Fill="#FF0000" 
                       Stroke="Black" 
                       StrokeThickness="0"
                       Height="320" Width="640" />
        </Canvas>
        <Button Name="buttonClear"
                Foreground="White"
                Width="100"
                Height="100">
            clear
        </Button>
        <TextBox Name="eventLog" 
                 Grid.Column="1"
                 Grid.Row="0"
                 Grid.RowSpan="3" 
                 Background="#000000" 
                 TextWrapping="Wrap" 
                 Foreground="#FFFFFF" 
                 ScrollViewer.VerticalScrollBarVisibility="Visible" 
                 BorderThickness="0" Grid.ColumnSpan="2"/>
    </Grid>
</Page>

String queryPointer(PointerPoint ptrPt)
{
    String details = "";

    switch (ptrPt.PointerDevice.PointerDeviceType)
    {
        case Windows.Devices.Input.PointerDeviceType.Mouse:
            details += "\nPointer type: mouse";
            break;
        case Windows.Devices.Input.PointerDeviceType.Pen:
            details += "\nPointer type: pen";
            if (ptrPt.IsInContact)
            {
                details += "\nPressure: " + ptrPt.Properties.Pressure;
                details += "\nrotation: " + ptrPt.Properties.Orientation;
                details += "\nTilt X: " + ptrPt.Properties.XTilt;
                details += "\nTilt Y: " + ptrPt.Properties.YTilt;
                details += "\nBarrel button pressed: " + ptrPt.Properties.IsBarrelButtonPressed;
            }
            break;
        case Windows.Devices.Input.PointerDeviceType.Touch:
            details += "\nPointer type: touch";
            details += "\nrotation: " + ptrPt.Properties.Orientation;
            details += "\nTilt X: " + ptrPt.Properties.XTilt;
            details += "\nTilt Y: " + ptrPt.Properties.YTilt;
            break;
        default:
            details += "\nPointer type: n/a";
            break;
    }

    GeneralTransform gt = Target.TransformToVisual(page);
    Point screenPoint;

    screenPoint = gt.TransformPoint(new Point(ptrPt.Position.X, ptrPt.Position.Y));
    details += "\nPointer Id: " + ptrPt.PointerId.ToString() +
        "\nPointer location (parent): " + ptrPt.Position.X + ", " + ptrPt.Position.Y +
        "\nPointer location (screen): " + screenPoint.X + ", " + screenPoint.Y;
    return details;
}

String queryPointer(PointerPoint ptrPt)
{
    String details = "";

    switch (ptrPt.PointerDevice.PointerDeviceType)
    {
        case Windows.Devices.Input.PointerDeviceType.Mouse:
            details += "\nPointer type: mouse";
            break;
        case Windows.Devices.Input.PointerDeviceType.Pen:
            details += "\nPointer type: pen";
            if (ptrPt.IsInContact)
            {
                details += "\nPressure: " + ptrPt.Properties.Pressure;
                details += "\nrotation: " + ptrPt.Properties.Orientation;
                details += "\nTilt X: " + ptrPt.Properties.XTilt;
                details += "\nTilt Y: " + ptrPt.Properties.YTilt;
                details += "\nBarrel button pressed: " + ptrPt.Properties.IsBarrelButtonPressed;
            }
            break;
        case Windows.Devices.Input.PointerDeviceType.Touch:
            details += "\nPointer type: touch";
            details += "\nrotation: " + ptrPt.Properties.Orientation;
            details += "\nTilt X: " + ptrPt.Properties.XTilt;
            details += "\nTilt Y: " + ptrPt.Properties.YTilt;
            break;
        default:
            details += "\nPointer type: n/a";
            break;
    }

    GeneralTransform gt = Target.TransformToVisual(page);
    Point screenPoint;

    screenPoint = gt.TransformPoint(new Point(ptrPt.Position.X, ptrPt.Position.Y));
    details += "\nPointer Id: " + ptrPt.PointerId.ToString() +
        "\nPointer location (parent): " + ptrPt.Position.X + ", " + ptrPt.Position.Y +
        "\nPointer location (screen): " + screenPoint.X + ", " + screenPoint.Y;
    return details;
}

備註

呼叫 TransformToVisual 以取得 UI 中兩個元素之間的座標位移。要考慮的第一個元素是您呼叫 TransformToVisual 的UIElement，第二個元素是您傳遞做為視覺參數的UIElement。例如，您可以使用轉換來判斷元素的界限如何放置在相對於配置父元素的座標系統中，而不是應用程式視窗。

TransformToVisual 會在所有會影響轉譯和位置的考慮之後提供座標結果，例如已套用 RenderTransform 。如果您要處理 RenderTransform 動畫或其他位置變更期間取得的點值，這會很有用。

TransformToVisual 最常見的案例是，如果您想要使用相對於所呼叫 UIElement 的本機座標系統，而且您不會處理具有將 Point 值轉換成物件參考框架的即時輸入事件。呼叫 TransformToVisual 之後，您就可以在傳回的GeneralTransform上呼叫TransformPoint。

注意

此方法傳回的 GeneralTransform 物件可以轉換成衍生類型 Transform，但您需要的所有方法都是由 GeneralTransform所定義。即使您可能預期轉換結果會是翻譯，您仍無法轉換成 TranslateTransform 。

適用於

UIElement.TransformToVisual(UIElement) 方法

定義

參數

傳回

範例

備註

適用於

另請參閱

意見反應

意見反應

其他資源