In ClearCanvas.ImageViewer.InputManagement.TileController.cs:

the CanStartNewHandler() method does a check to see if double click is enabled with a call to CanStartOnDoubleClick(handler).

If our mouse button behaviour is enumerated to "CancelStartOnDoubleClick", the above method should return true.  Instead it is backwards and actually returns false:

        private static bool CanStartOnDoubleClick(IMouseButtonHandler handler)
        {
            return false == CancelStartOnDoubleClick(handler);
        }

So in order to turn on double click functionality, I actually had to set my MouseButtonHandlerBehaviour to None, which is actually backwards from what is described in the enumeration comments.

Hi, here's the documentation I wrote for the CancelStartOnDoubleClick enum:

" Because a click must happen before a double-click, this allows an IMouseButtonHandler to opt-out after gaining initial capture (via IMouseButtonHandler.Start) and have the framework call MouseButtonHandler.Cancel in order to allow another handler to process the double-click."

I think you've misunderstood what that enum is for - it doesn't ENABLE double-click, but rather it does the opposite. Most tools capture the mouse on the first click, essentially stopping any double-click tools from working. So, all tools that don't intend to handle a double click (which is most of them) SET this flag as part of it's behaviour. By default, the flag is on because most tools are not double-click tools.

Here's the constructor for a double-click enabled tool in CC:

public ExplodeImageBoxTool()
{
//this tool is activated on a double-click
base.Behaviour &= ~MouseButtonHandlerBehaviour.CancelStartOnDoubleClick;
}

Hope this helps,
Stewart

Hi Stewart,

Thank you for your response!
I had tried that method, and I'm trying it once again today with no success. I've placed the line to activate double click in my tool's constructor, and if I understand correctly, the Cancel() method in that tool should be called when a double click event occurs. Is my understanding correct? All that is happening for me on a double click is my Start() method is called twice, both times with an IMouseInformation.ClickCount = 1. Am I missing something here? Thanks,

Steven

Steven, when you activate a tool for double-click, it should not have it's Cancel method called, but rather a different tool would (for example, the StackTool). The framework would then go on to call Start on your tool, with ClickCount=2.

Hope this helps,
Stewart