BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  find out when a window is changing its pos or size          BorlandTalk.com Forum Index -> C++ Builder (Native API) View previous topic :: View next topic   Author Message Jeff Kish Guest Posted: Wed Dec 14, 2005 3:07 pm    Post subject: find out when a window is changing its pos or size I need to know if it is possible to have windows tell me (register my interest somehow) in when a window is changing its size or pos, being min or maxed. Is there an api call or something I can do from within a dll? I'm trying to figure out a way to keep a form filling up exactly the space in an arbitrary window selected by the calling non borland application. thanks Jeff Kish Back to top Sam S. Firouz Guest Posted: Wed Dec 14, 2005 6:04 pm    Post subject: Re: find out when a window is changing its pos or size to detect change of window pos you have to trap WM_MOVE message. for size you can use the unresize event. for minimize you have to use the Application's OnMinimize and OnRestore event. sam "Jeff Kish" <jeff.kish (AT) mro (DOT) com> wrote Quote: I need to know if it is possible to have windows tell me (register my interest somehow) in when a window is changing its size or pos, being min or maxed. Is there an api call or something I can do from within a dll? I'm trying to figure out a way to keep a form filling up exactly the space in an arbitrary window selected by the calling non borland application. thanks Jeff Kish Back to top Jeff Kish Guest Posted: Wed Dec 14, 2005 7:12 pm    Post subject: Re: find out when a window is changing its pos or size On Wed, 14 Dec 2005 13:04:51 -0500, "Sam S. Firouz" <sfirouz (AT) Hotmail (DOT) com> wrote: Quote: to detect change of window pos you have to trap WM_MOVE message. for size you can use the unresize event. for minimize you have to use the Application's OnMinimize and OnRestore event. sam "Jeff Kish" <jeff.kish (AT) mro (DOT) com> wrote in message news:86d0q1puc7faipt9t10s9d4dd1vot4vfki (AT) 4ax (DOT) com... I need to know if it is possible to have windows tell me (register my interest somehow) in when a window is changing its size or pos, being min or maxed. Is there an api call or something I can do from within a dll? I'm trying to figure out a way to keep a form filling up exactly the space in an arbitrary window selected by the calling non borland application. thanks Jeff Kish I kind of knew that. But I was hoping the code in the dll could somehow register interest in WM_MOVE/WM_SIZE messages for another window, and whenever that window changed positions, the code in the dll would be notified so it could take some action. I.E. Even if I did not control the calling code. I can, certainly, tell the 'user' that they need to pass on Message receipts, but I was wondering if I could 'automagically' do that. Thanks Jeff Kish Back to top Remy Lebeau (TeamB) Guest Posted: Wed Dec 14, 2005 8:11 pm    Post subject: Re: find out when a window is changing its pos or size "Jeff Kish" <jeff.kish (AT) mro (DOT) com> wrote Quote: I need to know if it is possible to have windows tell me (register my interest somehow) in when a window is changing its size or pos, being min or maxed. Of course it is possible But how you do that exactly depends on whether the window you are interested in belongs to your application or not. If it does, then you can simply subclass the window directly to intercept the WM_MOVE, WM_MOVING, WM_SIZE, WM_SIZING, WM_WINDOWPOSCHANGING and/or WM_WINDOWPOSCHANGED message. If it does not, then you need to use SetWindowsHookEx() to install a global hook. The hook must be in a DLL so that it can be injected into all running processes. If you set a WH_CBT hook, you can receive HCBT_MINMAX and HCBT_MOVESIZE notifications. Or if you set a WH_CALLWNDPROC or WH_CALLWNDPROCRET hook to intercept the above window messages. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Wed Dec 14, 2005 8:12 pm    Post subject: Re: find out when a window is changing its pos or size "Jeff Kish" <jeff.kish (AT) mro (DOT) com> wrote Quote: But I was hoping the code in the dll could somehow register interest in WM_MOVE/WM_SIZE messages for another window, and whenever that window changed positions, the code in the dll would be notified so it could take some action. It can. See my other reply. 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