BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TCustomControl and form / application active          BorlandTalk.com Forum Index -> Delphi VCL Components Writing View previous topic :: View next topic   Author Message Jens Gruschel Guest Posted: Sun Oct 26, 2003 10:47 pm    Post subject: TCustomControl and form / application active Hello, I want my TCustomControl to look different if the parent form / application is not active. I tried to catch WM_ACTIVATE and WM_ACTIVATEAPP, but without success. Can anyone help? Jens Back to top Kurt Barthelmess Guest Posted: Mon Oct 27, 2003 10:22 am    Post subject: Re: TCustomControl and form / application active "Jens Gruschel" <nospam (AT) pegtop (DOT) net> wrote: Quote: I want my TCustomControl to look different if the parent form / application is not active. I tried to catch WM_ACTIVATE and WM_ACTIVATEAPP, but without success. Can anyone help? Child windows do not get such notifications - they go to the main window (if there.) Usually this is only done if the user moves to another control within the application. That can be "caught" by watching for a CM_EXIT message. But if the focus moves to another application, the previous app doesn't really care. It also gets complicated by the definition of "active" - if your app is processing messages (like a WM_TIMER or something that you add to check for this) then you are active. Catch-22<g>. Good luck. Kurt Back to top Jens Gruschel Guest Posted: Mon Oct 27, 2003 2:32 pm    Post subject: Re: TCustomControl and form / application active Quote: Child windows do not get such notifications - they go to the main window (if there.) Usually this is only done if the user moves to another control within the application. That can be "caught" by watching for a CM_EXIT message. But if the focus moves to another application, the previous app doesn't really care. It also gets complicated by the definition of "active" - if your app is processing messages (like a WM_TIMER or something that you add to check for this) then you are active. Catch-22<g>. If an item of a TListView is selected, and I click on another window (of another application), the item is not highlighted any more. So it must be possible, right? Jens Back to top Kurt Barthelmess Guest Posted: Mon Oct 27, 2003 5:37 pm    Post subject: Re: TCustomControl and form / application active "Jens Gruschel" <nospam (AT) pegtop (DOT) net> wrote: Quote: If an item of a TListView is selected, and I click on another window (of another application), the item is not highlighted any more. So it must be possible, right? There are three states you can be in: Focused, Application Active (but not focused), and Application Inactive (also not focused). I thought you wanted to distinguish between the last two of these. If all you care about is losing the focus - watch for a CM_EXIT message or use the OnExit event handler. Good luck. Kurt Back to top Jens Gruschel Guest Posted: Mon Oct 27, 2003 8:57 pm    Post subject: Re: TCustomControl and form / application active Quote: There are three states you can be in: Focused, Application Active (but not focused), and Application Inactive (also not focused). I thought you wanted to distinguish between the last two of these. I want to change the appearance of my control depending on the Focused property (like a TButton gets or looses its focus rectangle). Focused becomes False when I activate another window (of the same or another application). But there seems to be no notification message when Focused switches from True to False. So all I need is some notification whenever Focused changes (which in Fact is a function, no property). CM_ENTER and CM_EXIT only fire when another control within the same form gets the focus, not when another window becomes activated. My control cannot catch WM_ACTIVATE or WM_ACTIVATEAPP. CM_GOTFOCUS and CM_LOSTFOCUS seem not be used at all. I found that CM_UIACTIVATE does work. While CM_UIDEACTIVATE should be the opposite, unfortunatelly it seems not to work :-( Quote: If all you care about is losing the focus - watch for a CM_EXIT message or use the OnExit event handler. ....which is only fired when the parent form's ActiveControl property changes, not when the Focused "property" of the control changes. Jens Back to top Jens Gruschel Guest Posted: Mon Oct 27, 2003 9:26 pm    Post subject: Re: TCustomControl and form / application active Quote: CM_ENTER and CM_EXIT only fire when another control within the same form gets the focus, not when another window becomes activated. My control cannot catch WM_ACTIVATE or WM_ACTIVATEAPP. CM_GOTFOCUS and CM_LOSTFOCUS seem not be used at all. I found that CM_UIACTIVATE does work. While CM_UIDEACTIVATE should be the opposite, unfortunatelly it seems not to work I just found that WM_SETFOCUS and WM_KILLFOCUS do exactly what I need. Thanks for your time and patience! 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