TouchDevice.Id Properti

Definisi

Ruang nama:

System.Windows.Input

Rakitan:

PresentationCore.dll

Mendapatkan pengidentifikasi unik dari TouchDevice, seperti yang disediakan oleh sistem operasi.

public:
 property int Id { int get(); };

public int Id { get; }

member this.Id : int

Public ReadOnly Property Id As Integer

Nilai Properti

Int32

Pengidentifikasi unik dari TouchDevice.

Contoh

Contoh berikut menangani TouchMove peristiwa yang terjadi pada Canvas. Ketika sentuhan bergerak pada Canvas, dicentang Id . Jika pemindahan berasal dari sentuhan pertama, lokasinya akan direkam. Jika gerakan berasal dari sentuhan kedua, garis ditarik dari posisi sentuhan pertama ke posisi sentuhan kedua.

Contoh ini adalah bagian dari contoh yang lebih besar yang tersedia dalam gambaran TouchDevice umum kelas.

private void canvas_TouchMove(object sender, TouchEventArgs e)
{
    Canvas _canvas = (Canvas)sender as Canvas;
    if (_canvas != null)
    {
        TouchPoint tp = e.GetTouchPoint(_canvas);
        // This is the first touch point; just record its position.
        if (e.TouchDevice.Id == firstTouchId)
        {
            pt1.X = tp.Position.X;
            pt1.Y = tp.Position.Y;
        }
        // This is not the first touch point; draw a line from the first point to this one.
        else if (e.TouchDevice.Id != firstTouchId)
        {
            pt2.X = tp.Position.X;
            pt2.Y = tp.Position.Y;

            Line _line = new Line();
            _line.Stroke = new RadialGradientBrush(Colors.White, Colors.Black);
            _line.X1 = pt1.X;
            _line.X2 = pt2.X;
            _line.Y1 = pt1.Y;
            _line.Y2 = pt2.Y;

            _line.StrokeThickness = 2;
            _canvas.Children.Add(_line);
        }
    }
}

' Touch Move
Private Sub canvas_TouchMove(ByVal sender As System.Object, ByVal e As System.Windows.Input.TouchEventArgs)
    Dim _canvas As Canvas = CType(sender, Canvas)
    If (_canvas IsNot Nothing) Then
        Dim tp = e.GetTouchPoint(_canvas)
        ' This is the first touch point; just record its position.
        If e.TouchDevice.Id = firstTouchId Then
            pt1.X = tp.Position.X
            pt1.Y = tp.Position.Y

            ' This is not the first touch point; draw a line from the first point to this one.
        ElseIf e.TouchDevice.Id <> firstTouchId Then
            pt2.X = tp.Position.X
            pt2.Y = tp.Position.Y

            Dim _line As New Line()
            _line.Stroke = New RadialGradientBrush(Colors.White, Colors.Black)
            _line.X1 = pt1.X
            _line.X2 = pt2.X
            _line.Y1 = pt1.Y
            _line.Y2 = pt2.Y

            _line.StrokeThickness = 2
            _canvas.Children.Add(_line)
        End If
    End If
End Sub

Keterangan

mewakili TouchDevice satu sentuhan pada layar. Jika ada beberapa sentuhan, gunakan Id properti untuk membedakannya.