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Allow Unconnected Arrows - �Some of the time (Read 3124 times)

mattapayne YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 15 Joined: Mar 6^th, 2007	Allow Unconnected Arrows - �Some of the time Mar 26^th, 2007 at 3:48pm	Print Post
	Hi Again, Another question for you: In the current scenario that I'm working on, I need to allow the user to draw an arrow from a node (Box) to either a node (Box) or to another arrow. If they draw to another arrow, I programmatically create a new node, split the destination arrow and insert the new node between the newly created arrows. These are the only cases in which I want arrows to be created. To support drawing an arrow to an arrow, I think I have to set AllowUnconnectedArrow to true, otherwise I can only connect arrows between nodes. Is this correct? While providing this functionality, I also need to allow the user to select many items on the diagram (via the left mouse button/drag). The problem that arises is that if I set AllowUnconnectedArrows to true I can no longer support the left mouse button/drag to select element, because instead an arrow is drawn. So far the only solution I can find is to set AllowUnconnectedArrows to true when a node's activated event fires and to set AllowUnconnectedArrows to false when a node's deactivated event fires. While this does work, it's a little clunky. I can create an arrow from a node without activating the node. In this case, the user could not connect the arrow to another arrow because AllowUnconnectedArrows would never have been set to true. Have you got any suggestions as to how I could make this work a little better? Thanks, Matt


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Allow Unconnected Arrows - �Some of the time Reply #1 - Mar 26^th, 2007 at 4:30pm	Print Post
	Hi, You could keep AllowUnconnectedArrows enabled all the time, and create a custom Behavior class that inherits FlowChartBehavior. From the overridden StartDraw method return new InteractionState(FlowChart.Selection, -1, Action.Create) if there isn't any node under the mouse pointer, otherwise return base.StartDraw(). I hope that helps, Stoyan


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mattapayne YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 15 Joined: Mar 6^th, 2007	Re: Allow Unconnected Arrows - �Some of the time Reply #2 - Mar 26^th, 2007 at 4:47pm	Print Post
	Helpful, as always. Thanks, Stoyo. Matt


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mattapayne YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 15 Joined: Mar 6^th, 2007	Re: Allow Unconnected Arrows - �Some of the time Reply #3 - Mar 26^th, 2007 at 5:40pm	Print Post
	Hi Stoyo, FlowChartBehavior looks to be an internal sealed class. I'm using v4.0.3 - Sorry, should have mentioned that before. I'd rather not customize the library. Any other suggestions? Thanks, Matt


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Allow Unconnected Arrows - �Some of the time Reply #4 - Mar 27^th, 2007 at 4:27am	Print Post
	Hi Matt, It is a public class in version 4.3, which you should have received as an upgrade a few weeks ago. If you prefer to stay with version 4.0.3, you can still inherit from the base Behavior class. However, you would need to copy some part of the FlowChartBehavior code to reproduce the standard drawing logic. Another option is to handle the MouseMove event and check whether the mouse is over a node. If the mouse button is not pressed and there isn't a node under the mouse pointer, set AllowUnconnectedArrows to false, so that users can draw arrows only from nodes. In all other cases, set AllowUnconnectedArrows = true. Stoyan


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mattapayne YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 15 Joined: Mar 6^th, 2007	Re: Allow Unconnected Arrows - �Some of the time Reply #5 - Mar 27^th, 2007 at 11:45am	Print Post
	Hi Stoyo, Unfortunately, I'm not able to upgrade at this moment. I do have the source code, but it appears that most of the functionality that I would need to reproduce FlowChartBehavior is also internal to the assembly. (ie various methods, etc.) Maybe I'll have a look at your second suggestion. Thanks again. Matt


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mattapayne YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 15 Joined: Mar 6^th, 2007	Re: Allow Unconnected Arrows - �Some of the time Reply #6 - Mar 27^th, 2007 at 12:07pm	Print Post
	Hi Stoyo, The MoveMove handler suggestion works great! Thanks again. Matt


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