ManipulationDeltaEventArgs.IsInertial Properti

Definisi

Ruang nama:

System.Windows.Input

Rakitan:

PresentationCore.dll

Mendapatkan nilai yang menunjukkan apakah ManipulationDelta peristiwa terjadi selama inertia.

public:
 property bool IsInertial { bool get(); };

public bool IsInertial { get; }

member this.IsInertial : bool

Public ReadOnly Property IsInertial As Boolean

Nilai Properti

Boolean

trueManipulationDelta jika peristiwa terjadi selama inertia; false jika peristiwa terjadi saat pengguna memiliki kontak dengan UIElement.

Contoh

Contoh berikut menunjukkan penanganan aktivitas untuk peristiwa tersebut ManipulationDelta . Contoh memeriksa apakah ManipulationDelta peristiwa terjadi selama inertia dan apakah persegi panjang menyentuh tepi jendela. Jika kasus tersebut benar, aplikasi menghentikan manipulasi untuk mencegah persegi panjang meninggalkan area aplikasi yang terlihat. Contoh ini adalah bagian dari contoh yang lebih besar di Walkthrough: Membuat Aplikasi Sentuhan Pertama Anda.

void Window_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
{
    
    // Get the Rectangle and its RenderTransform matrix.
    Rectangle rectToMove = e.OriginalSource as Rectangle;
    Matrix rectsMatrix = ((MatrixTransform)rectToMove.RenderTransform).Matrix;

    // Rotate the Rectangle.
    rectsMatrix.RotateAt(e.DeltaManipulation.Rotation, 
                         e.ManipulationOrigin.X, 
                         e.ManipulationOrigin.Y);

    // Resize the Rectangle.  Keep it square 
    // so use only the X value of Scale.
    rectsMatrix.ScaleAt(e.DeltaManipulation.Scale.X, 
                        e.DeltaManipulation.Scale.X, 
                        e.ManipulationOrigin.X,
                        e.ManipulationOrigin.Y);

    // Move the Rectangle.
    rectsMatrix.Translate(e.DeltaManipulation.Translation.X,
                          e.DeltaManipulation.Translation.Y);

    // Apply the changes to the Rectangle.
    rectToMove.RenderTransform = new MatrixTransform(rectsMatrix);

    Rect containingRect =
        new Rect(((FrameworkElement)e.ManipulationContainer).RenderSize);

    Rect shapeBounds =
        rectToMove.RenderTransform.TransformBounds(
            new Rect(rectToMove.RenderSize));

    // Check if the rectangle is completely in the window.
    // If it is not and intertia is occuring, stop the manipulation.
    if (e.IsInertial && !containingRect.Contains(shapeBounds))
    {
        e.Complete();
    }

    e.Handled = true;
}

Private Sub Window_ManipulationDelta(ByVal sender As Object, ByVal e As ManipulationDeltaEventArgs)

    ' Get the Rectangle and its RenderTransform matrix.
    Dim rectToMove As Rectangle = e.OriginalSource
    Dim rectTransform As MatrixTransform = rectToMove.RenderTransform
    Dim rectsMatrix As Matrix = rectTransform.Matrix


    ' Rotate the shape
    rectsMatrix.RotateAt(e.DeltaManipulation.Rotation,
                         e.ManipulationOrigin.X,
                         e.ManipulationOrigin.Y)

    ' Resize the Rectangle. Keep it square 
    ' so use only the X value of Scale.
    rectsMatrix.ScaleAt(e.DeltaManipulation.Scale.X,
                        e.DeltaManipulation.Scale.X,
                        e.ManipulationOrigin.X,
                        e.ManipulationOrigin.Y)

    'move the center
    rectsMatrix.Translate(e.DeltaManipulation.Translation.X,
                          e.DeltaManipulation.Translation.Y)

    ' Apply the changes to the Rectangle.
    rectTransform = New MatrixTransform(rectsMatrix)
    rectToMove.RenderTransform = rectTransform

    Dim container As FrameworkElement = e.ManipulationContainer
    Dim containingRect As New Rect(container.RenderSize)

    Dim shapeBounds As Rect = rectTransform.TransformBounds(
                                New Rect(rectToMove.RenderSize))

    ' Check if the rectangle is completely in the window.
    ' If it is not and intertia is occuring, stop the manipulation.
    If e.IsInertial AndAlso Not containingRect.Contains(shapeBounds) Then
        e.Complete()
    End If

    e.Handled = True
End Sub

Keterangan

Anda dapat menggunakan metode ini untuk menentukan apakah ManipulationDelta peristiwa terjadi selama inertia atau saat pengguna memiliki kontak dengan elemen yang menerima ManipulationDelta peristiwa.