PointerEventHandler Delegado

Definición

Espacio de nombres:

Windows.UI.Xaml.Input

Representa el método que controlará eventos de mensaje de puntero como PointerPressed.

public delegate void PointerEventHandler(Platform::Object ^ sender, PointerRoutedEventArgs ^ e);

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.Guid(3828898089, 49156, 19407, 137, 112, 53, 148, 134, 227, 159, 136)]
class PointerEventHandler : MulticastDelegate

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.Guid(3828898089, 49156, 19407, 137, 112, 53, 148, 134, 227, 159, 136)]
public delegate void PointerEventHandler(object sender, PointerRoutedEventArgs e);

Public Delegate Sub PointerEventHandler(sender As Object, e As PointerRoutedEventArgs)

Parámetros

sender

Object

Platform::Object

IInspectable

Objeto en que está asociado el controlador de eventos.

e

PointerRoutedEventArgs

Datos del evento.

Atributos

ContractVersionAttribute GuidAttribute

Requisitos de Windows

Familia de dispositivos	Windows 10 (se introdujo en la versión 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (se introdujo en la versión v1.0)

Ejemplos

En el ejemplo de código siguiente se muestra el escenario 2 del ejemplo de entrada. Este código muestra algunos patrones de uso para la manipulación directa mediante los eventos PointerPressed, PointerReleased, PointerEntered, PointerExited y PointerMoved .

<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;
}

Private _pointerCount As Integer

Public Sub New()
    Me.InitializeComponent()
    AddHandler bEnteredExited.PointerEntered, AddressOf bEnteredExited_PointerEntered
    AddHandler bEnteredExited.PointerExited, AddressOf bEnteredExited_PointerExited
    AddHandler bEnteredExited.PointerPressed, AddressOf bEnteredExited_PointerPressed
    AddHandler bEnteredExited.PointerReleased, AddressOf bEnteredExited_PointerReleased
    AddHandler bEnteredExited.PointerMoved, AddressOf bEnteredExited_PointerMoved

    'To code for multiple Pointers (i.e. Fingers) we track how many entered/exited.
    _pointerCount = 0
End Sub

''' <summary>
''' Invoked when this page is about to be displayed in a Frame.
''' </summary>
''' <param name="e">Event data that describes how this page was reached.  The Parameter
''' property is typically used to configure the page.</param>
Protected Overrides Sub OnNavigatedTo(e As NavigationEventArgs)
End Sub

Private Sub bEnteredExited_PointerMoved(sender As Object, e As PointerRoutedEventArgs)
    Scenario2UpdateVisuals(TryCast(sender, Border), "Moved")
End Sub

Private Sub bEnteredExited_PointerReleased(sender As Object, e As PointerRoutedEventArgs)
    DirectCast(sender, Border).ReleasePointerCapture(e.Pointer)
    txtCaptureStatus.Text = String.Empty
End Sub

'Can only get capture on PointerPressed (i.e. touch down, mouse click, pen press)
Private Sub bEnteredExited_PointerPressed(sender As Object, e As PointerRoutedEventArgs)
    If tbPointerCapture.IsOn Then
        Dim _hasCapture As Boolean = DirectCast(sender, Border).CapturePointer(e.Pointer)
        txtCaptureStatus.Text = "Got Capture: " & _hasCapture
    End If
End Sub

Private Sub bEnteredExited_PointerExited(sender As Object, e As PointerRoutedEventArgs)
    _pointerCount -= 1
    Scenario2UpdateVisuals(TryCast(sender, Border), "Exited")
End Sub

Private Sub bEnteredExited_PointerEntered(sender As Object, e As PointerRoutedEventArgs)
    _pointerCount += 1
    Scenario2UpdateVisuals(TryCast(sender, Border), "Entered")

End Sub

Private Sub Scenario2UpdateVisuals(border As Border, eventDescription As String)
    Select Case eventDescription.ToLower()
        Case "exited"
            If _pointerCount <= 0 Then
                border.Background = New SolidColorBrush(Colors.Red)
                bEnteredExitedTextBlock.Text = eventDescription
            End If
            Exit Select
        Case "moved"

            Dim rt As RotateTransform = DirectCast(bEnteredExitedTimer.RenderTransform, RotateTransform)
            rt.Angle += 2
            If rt.Angle > 360 Then
                rt.Angle -= 360
            End If
            Exit Select
        Case Else
            border.Background = New SolidColorBrush(Colors.Green)
            bEnteredExitedTextBlock.Text = eventDescription
            Exit Select

    End Select
End Sub

Private Sub Scenario2ResetMethod(sender As Object, e As RoutedEventArgs)
    Reset()
End Sub

Private Sub Reset()
    bEnteredExited.Background = New SolidColorBrush(Colors.Green)
    bEnteredExitedTextBlock.Text = String.Empty
End Sub

Comentarios

Este delegado se usa para controlar cada uno de los siguientes eventos:

• PointerPressed
• PointerCanceled
• PointerCaptureLost
• PointerEntered
• PointerExited
• PointerMoved
• PointerReleased
• PointerWheelChanged