CRectTracker movement

How do i restrict the rectangle of a CRectTrack to move in horizontal direction only when the user LButtonDown on the rectangle and drags it  around?

I have managed to set the rectangle to 'Track' the mouse on LButton down.  What should i do after that?

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In the OnLButtonDown handler store the current vertical offset. Override the OnMouseMove message handler and change the value back to this stored offset before passing it through to the base class implimentation.
Derive your class from CRectTracker.
In your derived class override DrawTrackerRect(LPCRECTlpRect,...) method.
The default implementation of this method makes a call to CDC::DrawFocusRect, which draws a dotted rectangle.
In your overriden method you can do this call with and lpRect.bottom always changed to whatever you want them to be.

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System Programming

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