ImageViewerInteractiveMode Class

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Controls; 
 
// RotateInteractiveMode 
[TestClass] 
public class ImageViewerRotateInteractiveMode : ImageViewerInteractiveMode 
{ 
   public ImageViewerRotateInteractiveMode() 
   { 
   } 
   public override string Name 
   { 
      get { return "Rotate"; } 
   } 
 
   public override string ToString() 
   { 
      return Name; 
   } 
 
   // Called by the base class when the mode is started 
   public override void Start(ImageViewer viewer) 
   { 
      base.Start(viewer); 
 
      // add EventHandlers to the DragStarted, DragDelta and DragCompleted events 
      base.InteractiveService.DragStarted += InteractiveService_DragStarted; 
      base.InteractiveService.DragDelta += InteractiveService_DragDelta; 
      base.InteractiveService.DragCompleted += InteractiveService_DragCompleted; 
   } 
 
   // Called by the base class when the mode is stopped 
   public override void Stop(ImageViewer viewer) 
   { 
      // Check if we have started 
      if (IsStarted) 
      { 
         // remove EventHandlers from events 
         base.InteractiveService.DragStarted -= InteractiveService_DragStarted; 
         base.InteractiveService.DragDelta -= InteractiveService_DragDelta; 
         base.InteractiveService.DragCompleted -= InteractiveService_DragCompleted; 
 
         // Always call base class stop method 
         base.Stop(viewer); 
      } 
   } 
 
   // Called when the user starts a drag operation 
   void InteractiveService_DragStarted(object sender, InteractiveDragStartedEventArgs e) 
   { 
 
      if (!this.CanStartWork(e)) 
      { 
         return; 
      } 
 
      // Inform whoever is listening that we have started working 
      this.OnWorkStarted(EventArgs.Empty); 
 
 
   } 
 
   // Called when the user is dragging 
   void InteractiveService_DragDelta(object sender, InteractiveDragDeltaEventArgs e) 
   { 
      // If we are not working (for example, the user has not clicked the mouse button yet), then 
      // nothing to do 
      if (!this.IsWorking) 
      { 
         return; 
      } 
 
      // Perform our operation, get the change of the drag, then increase 
      // or decrease the current rotation angle based on direction 
      var viewer = this.ImageViewerControl; 
      var change = e.Change; 
      var delta = 4; 
      if (change.X < 0) 
      { 
         viewer.RotateAngle = viewer.RotateAngle - delta; 
      } 
      else if (change.X > 0) 
      { 
         viewer.RotateAngle = viewer.RotateAngle + delta; 
      } 
 
   } 
 
   // Called when the user has stopped dragging 
   void InteractiveService_DragCompleted(object sender, InteractiveDragCompletedEventArgs e) 
   { 
      if (!this.IsWorking) 
      { 
         return; 
      } 
 
      // Inform whoever is listening that we have stoped working 
      this.OnWorkCompleted(EventArgs.Empty); 
   } 
} 
 
//set InteractiveMode in new ImageViewer 
ImageViewer InteractiveModeExample() 
{ 
   Uri imageUrl = new Uri("ms-appx:///Assets/PngImage2.png"); 
 
   // Create the viewer 
   var viewer = new Leadtools.Controls.ImageViewer(); 
 
   // Set the image Source 
   viewer.Source = new BitmapImage(imageUrl); 
 
   // Set Rotate as our interactive mode 
   viewer.DefaultInteractiveMode = new ImageViewerRotateInteractiveMode(); 
 
   return viewer; 
}