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Drawing a command in progress?

Posted By:      Posted Date: October 15, 2010    Points: 0   Category :WPF

I'm writing my first WPF application and I need help choosing the right approach to commands.  I also using prism and MEF to allow extensions to the UI.

    I have a Viewport3D which essentially displays a map.  I want to allow users to create annotations on the map.  I also want extensions to be able to display and edit their own custom annotations.

    An example would be a command for the user to create a polyline.  I would like to display a custom mouse cursor during the command, render a line segment each time the left mouse button is clicked, and commit the geometry to a database when the executes.

    It seems that I need to ignore the built-in command system and create custom command implementation to inject a transparent PathGeometry over the Viewport3D, hook the Viewport3D input events, capture the mouse, and commit changes to the database when the user concludes the input sequence.

    Is there a better way to do this that I am missing?  ICommand doesn't seem to support drawing a command in progress.

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