MFC, Subclassing windows

Subclassing windows

Author	Message
Cameron Murra #1 / 6	Subclassing windows Hi, I have a dialog resource with several controls. What I would like to do is intercept in my dialog class the WM_KEYDOWN messages for each control. Is there any way to do this with subclassing? If so then how do you do it! Thanks, Cameron. P.S What is the effect of myControl.SubclassDlgItem( IDC_XX, this )? It seems to me that this will send all control notification messages to the control? Doesn't it do this anyway without the subclass?
Sat, 04 Nov 2000 03:00:00 GMT

Naama Bamberg #2 / 6	Subclassing windows Yes, you should use SubclassDlgItem(). 1. Create a class derived from the control you use - for example - class CMyControl : public CEdit. 2. Map WM_KEYDOWN message to this class. 3. in CMyControl::OnKeyDown do whatever you want. 4. Now if you define myControl of type CMyControl, and call myControl.SubclassDlgItem(..), you'll get what you want. Naama On Tue, 19 May 1998 15:22:13 -0700, Cameron Murray Quote: >Hi, >I have a dialog resource with several controls. What I would like to do >is intercept in my dialog class the WM_KEYDOWN messages for each >control. >Is there any way to do this with subclassing? If so then how do you do >it! >Thanks, >Cameron. >P.S What is the effect of myControl.SubclassDlgItem( IDC_XX, this )? It >seems to me that this will send all control notification messages to the >control? Doesn't it do this anyway without the subclass? Naama Bamberger Accent Software International
Sat, 04 Nov 2000 03:00:00 GMT

GRANDJEAN Alai #3 / 6	Subclassing windows A good idea is to use an Hook (SetWindowsHookEx, with WH_KEYBOARD as parameter). If you want a sample, write me back. Quote: > Hi, > I have a dialog resource with several controls. What I would like to do > is intercept in my dialog class the WM_KEYDOWN messages for each > control. > Is there any way to do this with subclassing? If so then how do you do > it! > Thanks, > Cameron. > P.S What is the effect of myControl.SubclassDlgItem( IDC_XX, this )? It > seems to me that this will send all control notification messages to the > control? Doesn't it do this anyway without the subclass?
Sat, 04 Nov 2000 03:00:00 GMT

Murali Krishna Devarakond #4 / 6	Subclassing windows <<-;snip;->>> P.S What is the effect of myControl.SubclassDlgItem( IDC_XX, this )? It Quote: >seems to me that this will send all control notification messages to the >control? Doesn't it do this anyway without the subclass? No, the default behaviour is to send the message to the parent (the Dialog). You can make the control handle the message though, using message reflection (it's round-about, but that's the way the MSFT guys designed it ;-O) Murali Krishna Devarakonda
Sat, 04 Nov 2000 03:00:00 GMT

Petr Novotn #5 / 6	Subclassing windows Quote: > Hi, > I have a dialog resource with several controls. What I would like to do > is intercept in my dialog class the WM_KEYDOWN messages for each > control. > Is there any way to do this with subclassing? If so then how do you do > it! Yes, it is possible to do that with subclassing; but in my experience it is much simpler to everride CDialog::PreTranslateMessage. This way you get a look at every message and you don't have to subclass anything; you don't have to rewrite your code after you add or remove some controls.
Sun, 05 Nov 2000 03:00:00 GMT

Jon Wolf #6 / 6	Subclassing windows <snip> Quote: >Doesn't it do this anyway without the subclass? Hi Cameron I think you might find that Class Wizard is adding DDX_Control() calls for any control member variables that you add to your dialog and this has a similar effect, although I'm not quite sure how ! Jon Lately it occurs to me what a long strange trip it's been ...
Sun, 05 Nov 2000 03:00:00 GMT

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