BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Switch focus between TpaintBox and TStringGrid          BorlandTalk.com Forum Index -> C++ Builder (Students) View previous topic :: View next topic   Author Message didan Guest Posted: Thu Apr 12, 2007 9:15 pm    Post subject: Switch focus between TpaintBox and TStringGrid Hi I have a TPaintBox and TStringGrid in a same form. I put DefocusControl( StringGrid1, true) in TPaintBox1 MouseDown event. The data in stringGrid will be deleted after I clicked paintbox if I clicked Delete key except the situation when one of the StringGrid's cell was masked. Can you help me? Thanks in advance. Back to top Hans Galema Guest Posted: Thu Apr 12, 2007 9:15 pm    Post subject: Re: Switch focus between TpaintBox and TStringGrid didan wrote: Quote: Hi I have a TPaintBox and TStringGrid in a same form. I put DefocusControl( StringGrid1, true) in TPaintBox1 MouseDown Why are you doing that? Quote: event. The data in stringGrid will be deleted after I clicked paintbox if I clicked Delete key except the situation when one of the StringGrid's cell was masked. And what is the question? It is unclear to me if the things that you describe already happen or that you want them to happen. How does one click a Delete key by the way? Hans. Back to top Hans Galema Guest Posted: Thu Apr 12, 2007 11:30 pm    Post subject: Re: Switch focus between TpaintBox and TStringGrid didan wrote: Quote: PaintBox is used for user to draw graphics. I know. Quote: Therefor,both PaintBox and StringGrid receive user's inputs. For a TStringGrid ok. But for a TPaintBox I wonder what you mean. Quote: If user edits StringGrid first then switch to draw graphics, such as to delete a line, the PaintBox will receive this delete stroking. A TPaintBox has no OnKeyDown or OnKeyPress or OnKeyUp event so it does not react on the user pressing a Delete key. Quote: I tried to use DefocusControl to remove the focus from stringGrid to PaintBox You cannot give focus to a TPaintBox. If you could then the user clicking a TPaintBox object would give focus to it. Quote: so that the StringGrid won't receive user's any key stroking. It didn't work. By using DefocusControl() the form will get the focus. So keystrokes go to the form. Use OnKeyDown or OnKeyPress or OnKeyUp event of the form. Hans. Back to top didan Guest Posted: Thu Apr 12, 2007 11:32 pm    Post subject: Re: Switch focus between TpaintBox and TStringGrid Quote: Why are you doing that? PaintBox is used for user to draw graphics. Therefor,both PaintBox and StringGrid receive user's inputs. If user edits StringGrid first then switch to draw graphics, such as to delete a line, the PaintBox will receive this delete stroking. I tried to use DefocusControl to remove the focus from stringGrid to PaintBox so that the StringGrid won't receive user's any key stroking. It didn't work. Hope it makes my question clear. I'm sorry for the confusing. Thanks for try to help me. Back to top Remy Lebeau (TeamB) Guest Posted: Fri Apr 13, 2007 1:43 am    Post subject: Re: Switch focus between TpaintBox and TStringGrid "Hans Galema" <notused (AT) notused (DOT) nl> wrote in message news:461e7bcf$1 (AT) newsgroups (DOT) borland.com... Quote: A TPaintBox has no OnKeyDown or OnKeyPress or OnKeyUp event so it does not react on the user pressing a Delete key. TPaintBox is a TGraphicControl descendant. It has no HWND of its own, and thus cannot receive user input event from the OS at all. Quote: You cannot give focus to a TPaintBox. True, but you can take focus away from the TStringGrid. Quote: By using DefocusControl() the form will get the focus. Only if the form is the direct Parent of the StringGrid. Otherwise, the StringGrid's Parent would be focused instead. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Fri Apr 13, 2007 1:46 am    Post subject: Re: Switch focus between TpaintBox and TStringGrid "didan" <relaxandfree (AT) yahoo (DOT) com> wrote in message news:461e4d09$1 (AT) newsgroups (DOT) borland.com... Quote: I put DefocusControl( StringGrid1, true) in TPaintBox1 MouseDown event. Make sure the form's ActiveControl property is not still pointing to the StringGrid after you have removed the focus. Gambit Back to top Didan Guest Posted: Fri Apr 13, 2007 3:43 am    Post subject: Re: Switch focus between TpaintBox and TStringGrid Yes, PaintBox doesn't fire key event, but I use form's key event to receive delete keystroke. It accidentally deletes the inputs on StringGrid. That is how I get problem. Back to top Remy Lebeau (TeamB) Guest Posted: Tue Apr 17, 2007 2:04 am    Post subject: Re: Switch focus between TpaintBox and TStringGrid "didan" <relaxandfree (AT) yahoo (DOT) com> wrote in message news:4623d861$1 (AT) newsgroups (DOT) borland.com... Quote: I guess it may be the case. How can I check it? ActiveControl is a pointer to a component instance. Just make sure it it not pointing at the TStringGrid. Or just explicitially set it to NULL after you call DefocusControl(). Gambit Back to top didan Guest Posted: Tue Apr 17, 2007 2:11 am    Post subject: Re: Switch focus between TpaintBox and TStringGrid Quote: Make sure the form's ActiveControl property is not still pointing to the StringGrid after you have removed the focus. Gambit I guess it may be the case. How can I check it? Thanks for help Back to top didan Guest Posted: Wed Apr 18, 2007 1:59 am    Post subject: Re: Switch focus between TpaintBox and TStringGrid Quote: ActiveControl is a pointer to a component instance. Just make sure it it not pointing at the TStringGrid. Or just explicitially set it to NULL after you call DefocusControl(). Gambit Hi Gambit It still doesn't work. If the cursor is on a cell, the cell always receives key press. What else can I try? Back to top Remy Lebeau (TeamB) Guest Posted: Wed Apr 18, 2007 3:42 am    Post subject: Re: Switch focus between TpaintBox and TStringGrid "didan" <relaxandfree (AT) yahoo (DOT) com> wrote in message news:4625270c$1 (AT) newsgroups (DOT) borland.com... Quote: It still doesn't work. If the cursor is on a cell, the cell always receives key press. What else can I try? Then you are not taking focus away from the TStringGrid in the first place. 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