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PointerRoutedEventArgs 類別

定義

包含最後一個指標事件訊息所傳回的引數。

public ref class PointerRoutedEventArgs sealed : RoutedEventArgs
/// [Windows.Foundation.Metadata.ContractVersion(Microsoft.UI.Xaml.WinUIContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
class PointerRoutedEventArgs final : RoutedEventArgs
[Windows.Foundation.Metadata.ContractVersion(typeof(Microsoft.UI.Xaml.WinUIContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
public sealed class PointerRoutedEventArgs : RoutedEventArgs
Public NotInheritable Class PointerRoutedEventArgs
Inherits RoutedEventArgs
繼承
Object Platform::Object IInspectable RoutedEventArgs PointerRoutedEventArgs
屬性

範例

下列程式碼範例顯示 輸入範例中的案例 2。 此程式碼顯示使用 PointerPressedPointerReleasedPointerEnteredPointerExitedPointerMoved 事件直接操作的一些使用模式。

<StackPanel x:Name="Scenario2Output" ManipulationMode="All">
  <StackPanel Orientation="Horizontal" Margin="0,10,0,0">
    <Button x:Name="scenario2Reset" Content="Reset" 
      Margin="0,0,10,0" Click="Scenario2Reset"/>
  </StackPanel>
  <StackPanel Orientation="Horizontal" >
    <ToggleSwitch x:Name="tbPointerCapture" 
      Header="Pointer Capture" FontSize="20"/>
    <TextBlock x:Name="txtCaptureStatus" 
      Style="{StaticResource BasicTextStyle}"/>
  </StackPanel>
  <Border x:Name="bEnteredExited" Background="Red" 
    Height="300" Width="450" CornerRadius="20" 
    HorizontalAlignment="Left">
    <Grid>
      <TextBlock Style="{StaticResource BasicTextStyle}" Text="" 
        HorizontalAlignment="Center" VerticalAlignment="Center" 
        x:Name="bEnteredExitedTextBlock"/>
      <Ellipse VerticalAlignment="Bottom" Stroke="Silver" 
        StrokeDashArray="2,2" StrokeThickness="2" Margin="2" 
        x:Name="bEnteredExitedTimer" Width="20" Height="20" 
        RenderTransformOrigin="0.5,0.5">
        <Ellipse.RenderTransform >
          <RotateTransform Angle="0" />
        </Ellipse.RenderTransform>
      </Ellipse>
    </Grid>
  </Border>
</StackPanel>
int _pointerCount;

public Scenario2()
{
    this.InitializeComponent();
    bEnteredExited.PointerEntered += bEnteredExited_PointerEntered;
    bEnteredExited.PointerExited += bEnteredExited_PointerExited;
    bEnteredExited.PointerPressed += bEnteredExited_PointerPressed;
    bEnteredExited.PointerReleased += bEnteredExited_PointerReleased;
    bEnteredExited.PointerMoved += bEnteredExited_PointerMoved;

    // To code for multiple Pointers (that is, fingers), 
    // we track how many entered/exited.
    _pointerCount = 0;
}

private void bEnteredExited_PointerMoved(object sender, 
    PointerRoutedEventArgs e)
{
    Scenario2UpdateVisuals(sender as Border, "Moved");
}

private void bEnteredExited_PointerReleased(object sender, 
    PointerRoutedEventArgs e)
{
    ((Border)sender).ReleasePointerCapture(e.Pointer);
    txtCaptureStatus.Text = string.Empty;
}

//Can only get capture on PointerPressed (i.e. touch down, mouse click, pen press)
private void bEnteredExited_PointerPressed(object sender, 
    PointerRoutedEventArgs e)
{
    if (tbPointerCapture.IsOn)
    {
        bool _hasCapture = ((Border)sender).CapturePointer(e.Pointer);
        txtCaptureStatus.Text = "Got Capture: " + _hasCapture;
    }
}

private void bEnteredExited_PointerExited(object sender, 
    PointerRoutedEventArgs e)
{
    _pointerCount--;
    Scenario2UpdateVisuals(sender as Border, "Exited");
}

private void bEnteredExited_PointerEntered(object sender, 
    PointerRoutedEventArgs e)
{
    _pointerCount++;
    Scenario2UpdateVisuals(sender as Border, "Entered");
}

private void Scenario2UpdateVisuals(Border border, 
    String eventDescription)
{
    switch (eventDescription.ToLower())
    {
        case "exited":
            if (_pointerCount <= 0)
            {
                border.Background = new SolidColorBrush(Colors.Red);
                bEnteredExitedTextBlock.Text = eventDescription;
            }
            break;
        case "moved":
            RotateTransform rt = 
                (RotateTransform)bEnteredExitedTimer.RenderTransform;
            rt.Angle += 2;
            if (rt.Angle > 360) rt.Angle -= 360;
            break;
        default:
            border.Background = new SolidColorBrush(Colors.Green);
            bEnteredExitedTextBlock.Text = eventDescription;
            break;
    }
}

private void Scenario2Reset(object sender, RoutedEventArgs e)
{
    Scenario2Reset();
}

private void Scenario2Reset()
{
    bEnteredExited.Background = new SolidColorBrush(Colors.Green);
    bEnteredExitedTextBlock.Text = string.Empty;
}

備註

在大部分情況下,建議您透過指標事件處理常式的事件引數取得指標資訊。

如果事件引數未內建公開應用程式所需的指標詳細資料,您可以透過 的 PointerRoutedEventArgsGetCurrentPointGetIntermediatePoints方法來存取擴充指標資料。 使用這些方法來指定指標資料的內容。

事件 PointerRoutedEventArgs 資料類別用於這些事件:

重要

滑鼠輸入會與第一次偵測到滑鼠輸入時指派的單一指標相關聯。 按一下滑鼠按鈕 (左鍵、滾輪或右鍵) 會透過 PointerPressed 事件建立指標與該按鈕的次要關聯。 只在放開相同的滑鼠按鈕時才會觸發 PointerReleased 事件 (這個事件完成前,沒有其他按鈕可以與該指標關聯)。 由於這個專屬關聯的關係,其他滑鼠按鈕的按一下都會經由 PointerMoved 事件進行路由。 您可以在處理此事件時測試滑鼠按鍵狀態,如下列範例所示。

private void Target_PointerMoved(object sender, PointerRoutedEventArgs e)
{
    Pointer ptr = e.Pointer;

    // Multiple, simultaneous mouse button inputs are processed here.
    // Mouse input is associated with a single pointer assigned when 
    // mouse input is first detected. 
    // Clicking additional mouse buttons (left, wheel, or right) during 
    // the interaction creates secondary associations between those buttons 
    // and the pointer through the pointer pressed event. 
    // The pointer released event is fired only when the last mouse button 
    // associated with the interaction (not necessarily the initial button) 
    // is released. 
    // Because of this exclusive association, other mouse button clicks are 
    // routed through the pointer move event.          
    if (ptr.PointerDeviceType == PointerDeviceType.Mouse)
    {
        // To get mouse state, we need extended pointer details.
        // We get the pointer info through the getCurrentPoint method
        // of the event argument. 
        PointerPoint ptrPt = e.GetCurrentPoint(Target);
        if (ptrPt.Properties.IsLeftButtonPressed)
        {
            eventLog.Text += "\nLeft button: " + ptrPt.PointerId;
        }
        if (ptrPt.Properties.IsMiddleButtonPressed)
        {
            eventLog.Text += "\nWheel button: " + ptrPt.PointerId;
        }
        if (ptrPt.Properties.IsRightButtonPressed)
        {
            eventLog.Text += "\nRight button: " + ptrPt.PointerId;
        }
    }

    // Prevent most handlers along the event route from handling the same event again.
    e.Handled = true;

    // Display pointer details.
    updateInfoPop(e);
}

特定事件通常具有各種指標裝置和指標點類別中的資訊,主要與該事件相關。 例如,當您處理PointerWheelChanged時,您可能對PointerPointProperties中的MouseWheelDelta感興趣。

GetIntermediatePoints 方法所擷 GetCurrentPoint 取的物件會透過Properties屬性提供擴充指標資訊的存取權,這個屬性會取得PointerPointProperties物件。

在下列範例中,我們會透過PointerPoint 和 PointerPointProperties物件取得擴充指標屬性。 (請參閱處理完整的 example.) 指標輸入

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

    switch (ptrPt.PointerDeviceType)
    {
        case PointerDeviceType.Mouse:
            details += "\nPointer type: mouse";
            break;
        case 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 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(panel);
    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;
}

一般而言,此方法傳回的物件是用來將指標資料摘要至 GestureRecognizer。 另一個案例是取得PointerWheelChanged事件的MouseWheelDelta;該值位於PointerPointProperties中。

屬性

Handled

取得或設定值,這個值會將路由事件標示為已處理,並防止事件路由中的大部分處理常式再次處理相同的事件。

IsGenerated

取得值,這個值表示指標事件是從使用者與物件直接互動發生,還是由平臺根據應用程式的 UI 變更而產生。

KeyModifiers

取得值,這個值表示起始指標事件時,哪些索引鍵修飾詞作用中。

OriginalSource

取得引發事件之 物件的參考。 這通常是控制項的範本部分,而不是在應用程式 UI 中宣告的專案。

(繼承來源 RoutedEventArgs)
Pointer

取得指標標記的參考。

方法

GetCurrentPoint(UIElement)

擷取 PointerPoint 物件,提供與事件相關聯之指標的基本資訊。

GetIntermediatePoints(UIElement)

從最後一個指標事件擷取 PointerPoint 物件的集合,這些物件代表最後一個指標事件的指標歷程記錄,並包含目前的指標事件。 集合中的每個 PointerPoint 都會提供有關與事件相關聯之指標的基本資訊。 集合中的最後一個專案相當於GetCurrentPoint所傳回的PointerPoint物件。

適用於

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