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Touch 類別

定義

提供應用程式層級的服務,這個服務會處理作業系統的多點觸控輸入,以及引發 FrameReported 事件。

public ref class Touch abstract sealed
public static class Touch
type Touch = class
Public Class Touch
繼承
Touch

範例

下列範例可讓您藉由將兩指拖曳到觸摸屏上,在 上 Canvas 建立簡單的模式。 每個觸控都會以 TouchDevice表示。 此圖樣是藉由繪製觸控所提供的觸控點之間的線條來建立。 此範例需要 Windows Touch 兼容畫面。

下列標記會建立使用者介面,其中包含 Canvas 中置中的 Grid

<Window x:Class="WpfTouchFrameSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="525" Width="525">
    <Grid>
        <Canvas x:Name="canvas1"
                Width="500" Height="500"
                Background="Black" />     
    </Grid>
</Window>

下列程式代碼會處理 FrameReported 事件。 當觸控按下 Canvas時,會 TouchDevice 擷取至 Canvas。 當觸控隨即解除時,會 TouchDevice 放開 。 當觸控在 之間 Canvas移動時, Id 會檢查 。 如果移動來自第一次觸控,則會記錄其位置。 如果移動來自第二個觸控,則會從第一個觸控的位置繪製線條到第二個觸控的位置。

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Shapes;

namespace WpfTouchFrameSample
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        // Variables for tracking the position of two points.
        Point pt1, pt2 = new Point();
        
        public MainWindow()
        {
            InitializeComponent();
            Touch.FrameReported += new TouchFrameEventHandler(Touch_FrameReported);
        }

        void Touch_FrameReported(object sender, TouchFrameEventArgs e)
        {
            if (this.canvas1 != null)
            {
                foreach (TouchPoint _touchPoint in e.GetTouchPoints(this.canvas1))
                {
                    if (_touchPoint.Action == TouchAction.Down)
                    {
                        // Clear the canvas and capture the touch to it.
                        this.canvas1.Children.Clear();
                        _touchPoint.TouchDevice.Capture(this.canvas1);
                    }

                    else if (_touchPoint.Action == TouchAction.Move && e.GetPrimaryTouchPoint(this.canvas1) != null)
                    {   
                        // This is the first (primary) touch point. Just record its position.
                        if (_touchPoint.TouchDevice.Id == e.GetPrimaryTouchPoint(this.canvas1).TouchDevice.Id)
                        {
                            pt1.X = _touchPoint.Position.X;
                            pt1.Y = _touchPoint.Position.Y;
                        }

                        // This is not the first touch point. Draw a line from the first point to this one.
                        else if (_touchPoint.TouchDevice.Id != e.GetPrimaryTouchPoint(this.canvas1).TouchDevice.Id)
                        {
                            pt2.X = _touchPoint.Position.X;
                            pt2.Y = _touchPoint.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;
                            this.canvas1.Children.Add(_line);
                        }
                    }

                    else if (_touchPoint.Action == TouchAction.Up)
                    {
                        // If this touch is captured to the canvas, release it.
                        if (_touchPoint.TouchDevice.Captured == this.canvas1)
                        {
                            this.canvas1.ReleaseTouchCapture(_touchPoint.TouchDevice);
                        }
                    }
                }                        
            }
        }
    }
}
Class MainWindow
    ' Variables for tracking the position of two points.
    Private pt1, pt2 As Point

    Public Sub New()
        InitializeComponent()
        AddHandler Touch.FrameReported, AddressOf Touch_FrameReported
    End Sub

    Private Sub Touch_FrameReported(ByVal sender As System.Object, ByVal e As System.Windows.Input.TouchFrameEventArgs)
        If (canvas1 IsNot Nothing) Then
            For Each _touchPoint In e.GetTouchPoints(Me.canvas1)

                If _touchPoint.Action = TouchAction.Down Then
                    ' Clear the canvas and capture the touch to it.
                    canvas1.Children.Clear()
                    _touchPoint.TouchDevice.Capture(canvas1)

                ElseIf _touchPoint.Action = TouchAction.Move Then
                    ' This is the first (primary) touch point. Just record its position.
                    If _touchPoint.TouchDevice.Id = e.GetPrimaryTouchPoint(Me.canvas1).TouchDevice.Id Then
                        pt1.X = _touchPoint.Position.X
                        pt1.Y = _touchPoint.Position.Y

                        ' This is not the first touch point; draw a line from the first point to this one.
                    ElseIf _touchPoint.TouchDevice.Id <> e.GetPrimaryTouchPoint(Me.canvas1).TouchDevice.Id Then
                        pt2.X = _touchPoint.Position.X
                        pt2.Y = _touchPoint.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
                        Me.canvas1.Children.Add(_line)
                    End If

                ElseIf _touchPoint.Action = TouchAction.Up Then
                    ' If this touch is captured to the canvas, release it.
                    If (_touchPoint.TouchDevice.Captured Is canvas1) Then
                        canvas1.ReleaseTouchCapture(_touchPoint.TouchDevice)
                    End If
                End If
            Next
        End If
    End Sub
End Class

備註

事件FrameReported包含在 WPF Windows Presentation Foundation () ,以支援 Silverlight 的相容性。 如果您不需要確保與 Silverlight 相容,請使用觸控事件,例如 TouchDown 、 或ContentElement上的UIElementUIElement3DTouchMove

事件 FrameReported 不會與其他 WPF 輸入事件使用相同的事件模型,例如 TouchDownTouchMove。 事件不是公開為可能透過UI物件樹狀結構路由的專案特定事件,而是 FrameReported 在應用層級處理的單一事件。 因此,您無法使用 sender 事件處理程式的 參數來判斷觸控的專案。

TouchFrameEventArgs使用取得TouchPoint與觸控事件相關的值。 TouchPoint您可以從 取得Position觸控的 ,並判斷 是否TouchActionDownMoveUp 動作。 您也可以使用 TouchPoint 取得 。 TouchDevice TouchDevice從 中,您可以判斷裝置Id,並取得所觸碰專案的相關信息。

事件

FrameReported

發生於傳送觸控訊息時。

適用於