InkEdit.Stroke (Evento)

Artículo
11/26/2008

Actualización: noviembre 2007

Se produce cuando el usuario termina de dibujar un nuevo trazo en un Tablet PC.

Espacio de nombres: Microsoft.Ink
Ensamblado: Microsoft.Ink (en Microsoft.Ink.dll)

Sintaxis

'Declaración
Public Event Stroke As InkEditStrokeEventHandler
'Uso
Dim instance As InkEdit
Dim handler As InkEditStrokeEventHandler

AddHandler instance.Stroke, handler

public event InkEditStrokeEventHandler Stroke

public:
 event InkEditStrokeEventHandler^ Stroke {
    void add (InkEditStrokeEventHandler^ value);
    void remove (InkEditStrokeEventHandler^ value);
}

/** @event */
public void add_Stroke (InkEditStrokeEventHandler value)
/** @event */
public void remove_Stroke (InkEditStrokeEventHandler value)

JScript no admite eventos.

Comentarios

El controlador de eventos recibe un argumento de tipo InkCollectorStrokeEventArgs que contiene datos sobre este evento.

Cuando se crea un delegado de InkCollectorStrokeEventHandler, se identifica el método que controla el evento. Para asociarlo al controlador de eventos, se debe agregar al evento una instancia del delegado. Siempre que se produce el evento, se llama a su controlador, a menos que se quite el delegado. El interés del evento predeterminado está activado.

Ejemplos

En este ejemplo se muestra cómo puede suscribirse al evento Gesture y al evento Stroke para aumentar la funcionalidad de un objeto ApplicationGesture.

Cuando se activa el evento Gesture, se examina el movimiento y el estado actual del control InkEdit. Si es necesario, se modifica el comportamiento del movimiento y se cancela el evento.

Private Sub mInkEdit_Gesture(ByVal sender As Object, ByVal e As InkEditGestureEventArgs)
    ' There might be more than one gesture passed in InkEditGestureEventArgs
    ' The gestures are arranged in order of confidence from most to least
    ' This event handler is only concerned with the first (most confident) gesture
    ' and only if the gesture is ApplicationGesture.Left with strong confidence
    Dim G As Gesture = e.Gestures(0)
    If (ApplicationGesture.Left = G.Id And RecognitionConfidence.Strong = G.Confidence) Then
        Dim pInkEdit As InkEdit = DirectCast(sender, InkEdit)
        ' by default, ApplicationGesture.Left maps to Backspace
        ' If the insertion point is at the beginning of the text
        ' and there is no text selected, then Backspace does not do anything.
        ' In this case, we will alter the gesture to map to Delete instead
        If (0 = pInkEdit.SelectionStart And 0 = pInkEdit.SelectionLength And pInkEdit.Text.Length > 0) Then
            ' take out the first character of the string
            pInkEdit.Text = pInkEdit.Text.Remove(0, 1)
            ' save the stroke ID in a class level var for use in the Stroke event
            Me.mStrokeID = e.Strokes(0).Id
            ' cancel the gesture so it won't perform the default action
            e.Cancel = True
        End If
    End If
End Sub

private void mInkEdit_Gesture(object sender, InkEditGestureEventArgs e)
{
    // There might be more than one gesture passed in InkEditGestureEventArgs
    // The gestures are arranged in order of confidence from most to least
    // This event handler is only concerned with the first (most confident) gesture
    // and only if the gesture is ApplicationGesture.Left with strong confidence
    Gesture G = e.Gestures[0];
    if (ApplicationGesture.Left == G.Id &&  RecognitionConfidence.Strong == G.Confidence)
    {
        InkEdit pInkEdit = (InkEdit)sender;

        // by default, ApplicationGesture.Left maps to Backspace
        // If the insertion point is at the beginning of the text
        // and there is no text selected, then Backspace does not do anything.
        // In this case, we will alter the gesture to map to Delete instead
        if (0 == pInkEdit.SelectionStart && 0 == pInkEdit.SelectionLength && pInkEdit.Text.Length > 0)
        {
            // take out the first character of the string
            pInkEdit.Text = pInkEdit.Text.Remove(0, 1);
            // save the stroke ID in a class level var for use in the Stroke event
            this.mStrokeID = e.Strokes[0].Id;
            // cancel the gesture so it won't perform the default action
            e.Cancel = true;
        }
    }
}

Cuando se activa el evento Stroke, éste se cancela si el trazo es el que se usó para generar el movimiento cuyo comportamiento se modificó en el evento Gesture. De este modo, se impide la representación del trazo.

Private Sub mInkEdit_Stroke(ByVal sender As Object, ByVal e As InkEditStrokeEventArgs)
    e.Cancel = (e.Stroke.Id = Me.mStrokeID)
End Sub

private void mInkEdit_Stroke(object sender, InkEditStrokeEventArgs e)
{
    e.Cancel = (e.Stroke.Id == this.mStrokeID);
}

Plataformas

Windows Vista

.NET Framework y .NET Compact Framework no admiten todas las versiones de cada plataforma. Para obtener una lista de las versiones compatibles, vea Requisitos de sistema de .NET Framework.