[mono-android] drag-drop listener

[Wally McClure]

Thanks.  Christntr got me set on this.

Wally

From: theevilprogrammer at hotmail.com
To: monodroid at lists.ximian.com
Date: Wed, 4 Jan 2012 20:50:41 -0500
Subject: [mono-android] drag-drop listener







I've tried my best to update the dnd sample to c# from http://developer.android.com/guide/topics/ui/drag-drop.html.  I've got an imageview that I am using.  The problem is that nothing in myDragListener seems to fire.  I think the problem is when I instantiate the class, I am handing in the incorrect handle.  Any suggestions on getting this to work?  The second problem is that the example lists a .SetColorFilter method on a view doesn't seem to be there.  Is there another method I can use?  Any thoughts/ideas are appreciated.

Wally



            // Sets the drag event listener for the View
            iv.SetOnDragListener(mDragListen);....................................................
        protected class myDragEventListener : View.IOnDragListener
        {
            Context _c;
            public myDragEventListener(Context c)
            {
                _c = c;
            }
            // This is the method that the system calls when it dispatches a drag event to the
            // listener.
            
            public bool OnDrag(View v, DragEvent e)
            {
 
                // Defines a variable to store the action type for the incoming event
                var action = e.Action;
                // Handles each of the expected events
                switch (action)
                {
 
                    case Android.Views.DragAction.Started:
 
                        // Determines if this View can accept the dragged data
                        if (e.ClipDescription.HasMimeType(ClipDescription.MimetypeTextPlain))
                        {
 
                            // As an example of what your application might do,
                            // applies a blue color tint to the View to indicate that it can accept
                            // data.
                            v.SetBackgroundColor(Android.Graphics.Color.Blue);
                            //v.SetColorFilter(Android.Graphics.Color.Blue);
 
                            // Invalidate the view to force a redraw in the new tint
                            v.Invalidate();
 
                            // returns true to indicate that the View can accept the dragged data.
                            return (true);
 
                        }
                        else
                        {
 
                            // Returns false. During the current drag and drop operation, this View will
                            // not receive events again until ACTION_DRAG_ENDED is sent.
                            return (false);
 
                        }
                        
                    case Android.Views.DragAction.Entered:
 
                        // Applies a green tint to the View. Return true; the return value is ignored.
                        v.SetBackgroundColor(Android.Graphics.Color.Green);
                        //v.setColorFilter(Color.GREEN);
 
                        // Invalidate the view to force a redraw in the new tint
                        v.Invalidate();
 
                        return (true);
 
                    case Android.Views.DragAction.Location:
                        // Ignore the event
                        return (true);
 
                    case Android.Views.DragAction.Exited:
                        // Re-sets the color tint to blue. Returns true; the return value is ignored.
                        //v.setColorFilter(Color.BLUE);
                        v.SetBackgroundColor(Android.Graphics.Color.Blue);
                        // Invalidate the view to force a redraw in the new tint
                        v.Invalidate();
 
                        return (true);
 
                    case Android.Views.DragAction.Drop:
 
                        // Gets the item containing the dragged data
                        ClipData.Item item = e.ClipData.GetItemAt(0);
 
                        // Gets the text data from the item.
                        var dragData = item.Text;
 
                        // Displays a message containing the dragged data.
                        Toast.MakeText(v.Context, "Dragged data is " + dragData, ToastLength.Long).Show();
 
                        // Turns off any color tints
                        //v.clearColorFilter();
 
                        // Invalidates the view to force a redraw
                        v.Invalidate();
 
                        // Returns true. DragEvent.getResult() will return true.
                        return (true);
 
                    case Android.Views.DragAction.Ended:
 
                        // Turns off any color tinting
                        //v.clearColorFilter();
 
                        // Invalidates the view to force a redraw
                        v.Invalidate();
 
                        // Does a getResult(), and displays what happened.
                        if (e.Result)
                        {
                            Toast.MakeText(v.Context, "The drop was handled.", ToastLength.Long).Show();
 
                        }
                        else
                        {
                            Toast.MakeText(v.Context, "The drop didn't work.", ToastLength.Long).Show();
 
                        };
 
                        // returns true; the value is ignored.
                        return (true);
 
                    // An unknown action type was received.
                    default:
                        Android.Util.Log.Error("DragDrop Example", "Unknown action type received by OnDragListener.");
                        return (true);
 
                };
            }
 
            IntPtr IJavaObject.Handle
            {
                get { return _c.Handle; }
            }
        }
 		 	   		  

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