我想在畫布上的圖像上刪除longpress上的圖像

Question

我使用下面給出的代碼在畫布上顯示圖像，現在我想要在該圖像上長按刪除顯示的圖像。我嘗試了contextmenu，但它不起作用。請任何人告訴我，我怎麼能做到這一點或正確使用文本菜單它

private void Stickers1_SelectionChanged(object sender, SelectionChangedEventArgs e) { 
    var selecteditem = e.AddedItems[0] as StickersImageListModel; 

    Stickers1.Visibility = Visibility.Collapsed;  

    // taking image from a list StickersImageListModel of images and bind with imageitem varaible  
    Image imageitem = new Image();  
    BitmapImage image = new BitmapImage(new System.Uri(selecteditem.Imageurl, UriKind.Absolute));  
    imageitem.Source = image; 

    //Add the images on canvas  
    my_canvas.Children.Add(imageitem);  
    imageitem.AllowDrop = true; 

    // DRag and drop the images on canvas 
    imageitem.ManipulationMode = ManipulationModes.All;  
    imageitem.ManipulationDelta += Drag_ManipulationDelta;  
    CompositeTransform ct = new CompositeTransform();  
    imageitem.RenderTransform = ct; 

    my_canvas.Visibility = Visibility.Visible;  
} 

Answer 1

可以使用Holding事件圖像。但是，您必須注意，Holding事件不會因桌面應用而被解僱，而必須使用RightTapped事件。 如果你只靶向到移動應用，您可以使用控股事件

// imageitem.RightTapped += Imageitem_RightTapped; 
      imageitem.Holding += Imageitem_Holding; 
      imageitem.IsRightTapEnabled = true; 
      imageitem.IsHoldingEnabled = true; 

private void Imageitem_RightTapped(object sender, RightTappedRoutedEventArgs e) 
     { 
      mycanvas.Children.Remove(sender as Image); 
     } 

     private void Imageitem_Holding(object sender, HoldingRoutedEventArgs e) 
     { 
      mycanvas.Children.Remove(sender as Image); 
     }