Why the polymorphism in CDockablePane::OnLButtonUp() in handling HTMAXBUTTON?

Question

In a Visual Studio project with dockable panes, when you press the hide button on the caption bar of the dockable pane, auto-hide is set and unset.

The clicking on the dockable-pane caption bar is eventually handled by CDockablePane::OnLButtonUp().

What's puzzling me is that the exact same method call calls two different methods depending on the docked mode.

The exact same function call, two different destination functions.  How is this even possible?  What am I missing here?

void CDockablePane::OnLButtonUp(UINT nFlags, CPoint point)
{

...some code here

			case HTMAXBUTTON:

...some code here

				else
				{
					if (pDockManager != NULL && pDefaultSlider != NULL &&
						(pDefaultSlider->GetCurrentAlignment() & pDockManager->GetEnabledAutoHideAlignment()))
					{
						SetAutoHideMode(!m_bPinState, pDefaultSlider->GetCurrentAlignment());
					}
				}
				return;

...some code here
}

Code Snippet 1:  The highlighted method calls either CDockablePane::SetAutoHideMode() or CBaseTabbedPane::SetAutoHideMode() depending on the auto-hide mode.  How is this possible?

Answer 1

I think I just asked a dumb question.

My bet is that while the dockable-pane is un-hidden, it is contained in CBaseTabbedPane, hence CBaseTabbedPane::SetAutoHideMode() is called.

When the dockable-pane is hidden, it is on its own, so CDockablePane::SetAutoHideMode() is called.

Answer 2

Thanks for sharing the solution.

 

Best regards,

Jesse

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Jesse Jiang [MSFT]
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