The MindFusion Forums - Lack of screen updates when using OnModify()

(UTC)

The MindFusion Forums › Flow Diagramming Components › Windows Forms › Lack of screen updates when using OnModify()

(Moderator: Slavcho)

‹ Previous Topic | Next Topic ›

Pages: 1

Send Topic

Lack of screen updates when using OnModify() (Read 2245 times)

Rennie Full Member Offline I Love MindFusion! Posts: 108 Location: Copenhagen, Denmark Joined: Jul 17^th, 2012	Lack of screen updates when using OnModify() Apr 2^nd, 2013 at 10:05am	Print Post
	I'm using a custom node class, derived from DiagramNode. In a previous version of my program that did not use OnModify() you could see the node being moved or resized as it was done. Now I'm trying to use OnModify(), and the node is not resized or moved until I release the mouse button. In other words, while the mouse is being moved there is no visual feedback that the move or resize operation is working - even though it is working. Is there some way to get the same mouse-screen interaction when using OnModify() as when not using it?


	IP Logged

Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Lack of screen updates when using OnModify() Reply #1 - Apr 2^nd, 2013 at 12:33pm	Print Post
	OnModify is called just before raising the NodeModified event, and there shouldn't be any differences with your previous version if OnModify runs exactly the same code as previous NodeModified handler: Code internal void RaiseModified(DiagramNode node, PointF mousePosition, AdjustmentHandles adjustmentHandle) { node.OnModify(mousePosition, adjustmentHandle); NodeEventArgs e = new NodeEventArgs(node, mousePosition, adjustmentHandle); RaiseNodeModified(e); } So check for differences between the OnModify / NodeModified code in both versions, or look for the problem somewhere else (e.g. Draw or DrawLocal overrides). I hope that helps, Stoyan


	IP Logged

Rennie Full Member Offline I Love MindFusion! Posts: 108 Location: Copenhagen, Denmark Joined: Jul 17^th, 2012	Re: Lack of screen updates when using OnModify() Reply #2 - Apr 2^nd, 2013 at 9:49pm	Print Post
	Thanks. This was my mistake - I thought the OnModify event was fired continuously during the mouse movement, but it's only fired once at the end of the modification. But now I've run into another problem. I'm trying to have my custom node defined primarily via some added fields in the derived class, and not primarily defined by the Bounds object. After determining that OnModify was not what I needed to provide continuous updating during a move or resize I figured that Diagram.NodeModifying was the way to go. But that event was not firing at all - at least until I discovered that having a Node.AllowModify override method that always returned true was preventing the Diagram.NodeModifying event from being fired. This seems strange, and isn't documented as far as I can see. (Please either fix the code or document this behavior.) So removing the Node.AllowModify method permits Diagram.NodeModifying to be used, and now I can see the movement of one node happening as it happens. But now I've discovered that Diagram.NodeModifying does not get fired if multiple nodes are being moved! So I still don't have a viable solution - I do want to be able to show multiple nodes being moved as they are moved. What to do? Edit: The StartDraw() method in my custom Behavior class is not getting called either when multiple nodes are being moved.
	« Last Edit: Apr 2^nd, 2013 at 11:53pm by Rennie »

	IP Logged

Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Lack of screen updates when using OnModify() Reply #3 - Apr 3^rd, 2013 at 7:48am	Print Post
	There is the SelectionMoving event raised if moving multiple selected nodes. If you need to update your fields from a node's Bounds while the node is being moved or resized, the best method to override should be OnUpdateBounds(). I hope that helps, Stoyan


	IP Logged

Pages: 1

Send Topic

‹ Previous Topic | Next Topic ›

« Board Index ‹ Board Top