Drag and Drop with Managed Code

re: Drag and Drop with Managed Code

dr d b karron — Thu, 12 Nov 2009 19:26:09 GMT

what about </Thumb ... >

or am i being </Dumb ...???>

dr K

re: Drag and Drop with Managed Code

suedama1756 — Thu, 03 Sep 2009 19:26:39 GMT

Thought you guys might be interested in this, just open source a "almost" WPF compatible drag drop framework for Silverlight blogs.imeta.co.uk/.../726.aspx

re: Drag and Drop with Managed Code

ABL — Tue, 03 Feb 2009 16:38:44 GMT

The scrumwall application at www.scrumwall.com/scrumwall.aspx has a good amount of drag and drop. Looks cool!

Requires registering for the demo though.

re: Drag and Drop with Managed Code

IanBlackburn — Sat, 17 Jan 2009 16:29:52 GMT

The url to my blog entry above seems to have been comprehensively mangled some how, so here is a tinyurl instead:

http://tinyurl.com/8zt98x

Cheers

re: Drag and Drop with Managed Code

noamarbel — Fri, 16 Jan 2009 23:35:05 GMT

Of course, its the order that events get fired. The squere gets the event first (as it was registered last).

re: Drag and Drop with Managed Code

Boot2TheHead — Thu, 15 Jan 2009 21:48:13 GMT

Weird, that snapover bug only happens when the circle goes over the square but not vice versa.

Drag & Drop mit Managed Code at Programming with Silverlight, WPF & .NET

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re: Drag and Drop with Managed Code

Boot2TheHead — Wed, 14 Jan 2009 20:53:27 GMT

I reproduced the snapover bug that thebirdbath found. I also managed to get the circle to stay 50% opaque (not sure how) and move the objects off the canvas. So it'll need some work but it's a helpful example.

re: Drag and Drop with Managed Code

thebirdbath — Wed, 14 Jan 2009 18:48:47 GMT

Found a bug.

Grab the circle and then roll over to the square. It will automatically grab the square and then fade the circle out a bit in opacity.....keep doing it and the circle will disappear entirely.

I'm a blend/xaml designer so I can't give you any pointers on how to fix that, all I can help you with is making a much prettier square and circle. :)

-zac

re: Drag and Drop with Managed Code

bobdupuy — Wed, 14 Jan 2009 17:42:35 GMT

Setting the event handlers (mouse down, move, up) directly on the graphic objects is very easy to implement, as the hit testing is done by the framework.

But it has a drawback: Sometimes, you need to do an action (drag and drop for example) when the mouse is close to the object, but still not inside it. For example, try to drag and drop a line that's 1 pixel wide...You probably want to add some extra space around the line to make interaction easier...

This is possible when using the FindElementsInHostCoordinates method that takes a rectangle as parameter.

Robert.

re: Drag and Drop with Managed Code

jesseliberty — Wed, 14 Jan 2009 15:24:22 GMT

That sounds way too defensive to my ears. Time for me to put together a FAQ about (a) how I approach this blog and (b) where to get more info and advanced coverage. Steve and Ian, thanks for the pointers on more advanced coverage.

-j

re: Drag and Drop with Managed Code

jesseliberty — Wed, 14 Jan 2009 14:30:29 GMT

Responding to comments: It is always a balancing act as to how much to include in a blog entry. I agree that a working model would have been good; I'll add that now. As for source, I did include the complete source, so I'm not sure why adding downloadable source would be helpful; I'm willing but in this case you can copy and paste.

Steve, I like what you've done, but the goal here was just to show the fundamentals. Yours is very nice, but not quite as straightforward (imho).

In any case, I'll update right now with a working version in an iframe.

re: Drag and Drop with Managed Code

Steve Strong — Tue, 13 Jan 2009 21:05:45 GMT

I have done a lot of drag and drop in silverlight, I have found the a better technique is to move the Mouse down and Mouse UP events from the actual objects, and place these events on the canvas, Then use the visual tree to method do the hit test...

Point oPoint = e.GetPosition(null);

KnowledgeShape oFound = null;

foreach (UIElement oElement in VisualTreeHelper.FindElementsInHostCoordinates(oPoint, this))

{

KnowledgeShape oShape = oElement as KnowledgeShape;

if (SelectStatus(oShape) == SelectionStatus.OnShape)

oFound = oShape;

else if ( oFound == null && SelectStatus(oShape) == SelectionStatus.OnPage)

oFound = oShape;

}

re: Drag and Drop with Managed Code

IanBlackburn — Tue, 13 Jan 2009 20:01:40 GMT

Hi Jesse,

This is a nice example, but is limited in that it requires the use of a Canvas.

I put together an example over on my Silverlight for Buiness blog (silverlightforbusiness.net) that shows how to perform drag and drop over any layout and also how to do a basic hit test:

blackburnian.spaces.live.com/.../cns!FB8B852EF1AB0B35!1759.entry

Hope someone finds it useful!

Cheers

Ian

Silverlight Cream for January 13, 2009 -- #484

Community Blogs — Tue, 13 Jan 2009 19:58:03 GMT

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