SubClassing a Child control "in a Control"

[Jules Marchildon]

Hi!

I have a Tab control that is subclassed. On the upper right corner
of this control is an Up-Down(spin control) This UpDown control sends
the Tab several messages like WM_SETFOCUS,WM_HSCROLL,WM_PAINT.

The message that I want from the Up-Down control is only available
if I subClass it aswell. So how do you subclass a child(UpDown) control
in a (Tab) control? (How to get its hWnd handle?)

Note: I also have subclassed this Tab control to trap several needed messages.


Thanks for any help or suggestions.

Regards, Jules [email protected]


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[Steve Hutchesson]

Jules,

I think you have to enumerate the child windows of the tab control
to see if you get anything back from it. If its the only control
on the tab control, it should be easy enough but if there are a
number of different types, you may have to differentiate on the basis
of the class name of each enumerated window.

Good Luck.

[email protected]

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[Dominic Mitchell]

You could use EnumChildWindows as Hutch suggested but because of the small
number of windows involved a direct approach is better.

hWndUpDown = GetWindow(hWndTab, %GW_CHILD)

The above is fine for a tab control because it has only one child control.

The following using the combo box as an example demonstrates a more general
approach. The combo box(CBS_DROPDOWN, CBS_SIMPLE) has two child controls,
an edit box and a list box. To get the handle of the list box do the following.

hWndList = GetWindow(hWndCombo, %GW_CHILD)
GetClassName hWndList, szClassName, 255
IF UCASE$(szClassName) <> "COMBOLBOX" THEN hWndList = GetWindow(hWndList, %GW_HWNDNEXT)

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Dominic Mitchell

[This message has been edited by Dominic Mitchell (edited September 03, 2000).]

[Jules Marchildon]

Thank you Gentlemen!

It should of hit me if I had of thought of the ComboBox Idea. I have
several snippets to subclass the children of ComboBoxes.

Thanks again for your time and help!

Regards, Jules