topic Re: multiple times MouseLeftButtonDown on GraphicsLayer problem in ArcGIS API for Silverlight Questions

multiple times MouseLeftButtonDown on GraphicsLayer problem

DeminHu — Mon, 12 Dec 2011 20:13:31 GMT

Hi,

I experienced a problem with multiple times MouseLeftButtonDown on the same graphicsLayer, now I figured out how to avoid this problem, but I hope I could get better idea how to handle the issue.

My problem is like the following:

#1. I have an application with two user controls called userControl1, usercontrol2, a graphicsLayer called gLayer

#2. In the MainPage, int the UserControl_Loaded function like this :
     control1 = new userControl1( map, gLayer);
     control2 = new usercontrol2(map, gLayer);

in the userControl1 code, have some processes like : gLayer.graphics.Clear() -> gLayer.Graphics.Add(graphic) ->   gLayer.MouseLeftButtonDown +=new GraphicsLayer.MouseButtonEventHandler ( gLayer_MouseLeftButtonDown1), then do something

in the usercontrol2 code have processes like : gLayer.graphics.Clear() -> gLayer.Graphics.Add(graphic) -> gLayer.MouseLeftButtonDown +=new GraphicsLayer.MouseButtonEventHandler ( gLayer_MouseLeftButtonDown2), then do something else.

#3. When I stated the application, with user controls1, it would be OK, but with usercontrol2, when mouseLeftButtondown on gLayer, I got the error : Required parameter is null or empty. Parameter name : graphics

#4. If in the UserControl_Loaded function of the MainPage, put control2 over control1, then the error would come with control1, control2 would be OK.

#5, When I used 2 graphicslayers for control1 and control2 respectively, it would be OK. Since in my application, I have many controls need to call the same graphicslayer and click on the same layer, I hope I could find a better way.

Thanks in advance for your help.

Re: multiple times MouseLeftButtonDown on GraphicsLayer problem

DominiqueBroux — Tue, 13 Dec 2011 08:11:47 GMT

Could you share a simple test page allowing to reproduce the issue?

Re: multiple times MouseLeftButtonDown on GraphicsLayer problem

DeminHu — Tue, 13 Dec 2011 13:23:18 GMT

Hi, Dominique

Thank you so much , I tested again, I realized I made a very silly mistaken for a complicated situation. My mistake like the following :

#1. in Main Page, UserCotrol_load funtion, I have something like this :
            Control1 ctrl1 = new Control1(TestMap, testGLayer);
            Control1Panel.Children.Add(ctrl1);
             Control2 ctrl2 = new Control2(TestMap, testGLayer);
            Control2Panel.Children.Add(ctrl2);
       in Control1 code : testGLayer.MouseLeftButtonDown -> dosomething()
       in Control2 code : testGLayer.MouseLeftButtonDown -> dosomethingelse()

#2. When we start the application, whenever, click the GLayer, it will excute both :dosomething(),dosomethingelse(), not one of them.

Thanks again for your time.