dropping files using Safari on Mac

[Scott Waye]

Using Safari 6.0.5 on Mac OS 10.8.4, I want to drop files from outside Safari on to nodes in the tree view.  I have this working fine on Windows.  I see from around the internet:

http://social.msdn.microsoft.com/Forums/silverlight/en-US/faf922b4-370c-4901-9e87-385ef410e61f/silverlight-5-drag-and-drop-on-mac-os-x-1075-and-safari
http://connect.microsoft.com/VisualStudio/feedback/details/726450/silverlight-5-drag-from-file-system-does-not-work-on-mac-osx-10-7-running-safari

that this may be broken in the latest versions of Safari, so before I spend a lot of time looking for workarounds using HTML 5 events and FileReader() have you already investigated this and got a working example for Macs?

I've read http://msdn.microsoft.com/en-us/library/ee670998%28VS.95%29.aspx also but as mentioned elsewhere this works for the events except the drop event which is not propagated to Silverlight.

Thanks,

Scott

[Tina Stancheva]

Hi Scott,

I've been trying to workaround the issue but it definitely seems that the Silverlight plug-in doesn't receive any proper notification of the drop action in Safari on Mac and unfortunately I was also not able to come up with any solutions.

This is why the RadTreeView control also can't detect the drop operation or handle it in any way. I'm afraid that at the moment we can't suggest nor implement any solutions for the same.

Regards,
Tina Stancheva
Telerik

[Scott Waye]

Ok thanks,

I managed to work around it with a some Html 5 events and a Scriptable event in the Silverlight code.

[Cavit]

Do you know if there is a fix for drag and drop issue for Silverlight on Safari - Mac ?

Thanks

[Petar Mladenov]

Hi Cavit,

Currently we have no sample with implemented workaround. I guess Scott has used the techniques described here.

Regards,
Petar Mladenov
Telerik

 

 

[Scott Waye]

Yes, the javascript looks like:

 

function handleDropEvent(oEvent) {
    // Prevent default operations in DOM
    oEvent.preventDefault();
    var agControl = document.getElementById("AgControl1");
    var flag = agControl.dragDrop(oEvent);
    // If handled, then stop propagation of event in DOM
    if (flag) oEvent.stopPropagation();

    var file = oEvent.dataTransfer.files[0];
    var reader = new FileReader();
    reader.onload = (function (theFile) {
        return function (e) {
            agControl.Content.mySLapp.Drop(oEvent.x, oEvent.y, theFile.name, new Uint8Array(e.target.result));
        };
    })(file);
    reader.readAsArrayBuffer(file);
}

And the c#:

 

public class ScriptableDropHandler
    {
        [ScriptableMember]
        public void Drop(object x, object y, object name, object args)
        {
            var scriptObject = args as ScriptObject;
            if(scriptObject != null)
            {
                var length = scriptObject.GetProperty("length");
                var intLength = Convert.ToInt32(length);

                var bytes = new byte[intLength];
                for(var i = 0; i < bytes.Length; i++)
                {
                    bytes[i] = Convert.ToByte(scriptObject.GetProperty(i));
                }

                var elements = VisualTreeHelper.FindElementsInHostCoordinates(new Point((double)x, (double)y), Application.Current.RootVisual);
                foreach (var element in elements)
                {
                    var handler = FileDropHandlerBehavior.GetFileDropHandler(element);
                    if(handler != null)
                    {
                        handler.Accept(new FileDropArgs
                            {
                                Source = element,
                                FileDropInfos = new [] { new FileDropInfo
                                    {
                                        Name = name as string,
                                        Contents = bytes
                                    }}
                            });
                        break;
                    }
                }
            }
        }

 

If I remember correctly though, I think a recent update to Mac/Safari has broken something and I've not had a chance to investigate.

[Cavit]

Thanks a lot for thre replies.