CODEWITHSUNDEEP
winapi
Maxim Fedorov
Maxim Fedorov

Reputation: 49

Z-index in winapi

I need the ability to set the window not only z-type (always top/always bottom/etc.), but also z-index (0..+inf.).

Windows with smaller z-index values ​​should be lower than windows with greater. I know about SetWindowPos and it`s parameter hWndInsertAfter, using it I can achieve what I want, but this way seems too complicated.
Is there better solution ?

Upvotes: 0

Views: 2845

Answers (1)

IInspectable
IInspectable

Reputation: 51506

The windowing subsystem maintains the Z-Order, implemented as a list:

The system maintains the z-order in a single list.

You can move windows in this list (by calling SetWindowPos for example), passing the previous window as an index, or HWND_TOP to move a window to the front. There is no API that uses an ordinal as the index.

If you need to insert a window ahead of another window, call GetNextWindow(GW_HWNDPREV) first to be passed as the hWndInsertAfter. If there is no window ahead in the z-order, GetNextWindow returns NULL, which conveniently maps to HWND_TOP.

Upvotes: 2

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