BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Forms Docking to Desktop edges?          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Usage) View previous topic :: View next topic   Author Message qyte Guest Posted: Tue Mar 15, 2005 2:23 pm    Post subject: Forms Docking to Desktop edges? Does anyone know what can i do so that a form can attach to the desktop edges when dragging it? I don't know anything on the matter. a good description would be great. Back to top Dirk Schnitzler Guest Posted: Thu Mar 24, 2005 4:20 pm    Post subject: Re: Forms Docking to Desktop edges? "qyte" <gyte (AT) vivodinet (DOT) gr> schrieb im Newsbeitrag news:4236efc4 (AT) newsgroups (DOT) borland.com... Quote: Does anyone know what can i do so that a form can attach to the desktop edges when dragging it? I don't know anything on the matter. a good description would be great. My code should be very easy to follow... Sample header file: class TfrmMain : public TForm { __published: private: public: __fastcall TfrmMain(TComponent* Owner); bool AllowOutside; void __fastcall OnFormMove(TWMMove aMsg); protected: BEGIN_MESSAGE_MAP VCL_MESSAGE_HANDLER(WM_MOVE, TWMMove, OnFormMove) END_MESSAGE_MAP(TForm) }; Sample cpp file: file://--------------------------------------------------------------------- ------ __fastcall TfrmMain::TfrmMain(TComponent* Owner) : TForm(Owner) { AllowOutside = false; } file://--------------------------------------------------------------------- ------ void __fastcall TfrmMain::OnFormMove(TWMMove aMsg) { static int OldLeft = Left; static int OldTop = Top; if(OldLeft!=Left || OldTop!=Top){ file://Form has been moved... check distance to screen borders: int Right = Left + Width; int Bottom = Top + Height; int BottomBorder = Screen->WorkAreaTop+Screen->WorkAreaHeight; int RightBorder = Screen->WorkAreaLeft+Screen->WorkAreaWidth; if(Left>0 || !AllowOutside){ if(Screen->WorkAreaLeft+SNAP_DIF_X >= Left){ Left = Screen->WorkAreaLeft; } } if(Right<RightBorder || !AllowOutside){ if(Right >= RightBorder-SNAP_DIF_X){ Left = RightBorder-Width; } } if(Top>0 || !AllowOutside){ if(Screen->WorkAreaTop+SNAP_DIF_X >= Top){ Top = Screen->WorkAreaTop; } } if(Bottom<BottomBorder || !AllowOutside){ if(Bottom >= BottomBorder-SNAP_DIF_Y){ Top = BottomBorder-Height; } } } OldLeft = Left; OldTop = Top; } Regards, Dirk. Back to top Dirk Schnitzler Guest Posted: Thu Mar 24, 2005 4:30 pm    Post subject: Re: Forms Docking to Desktop edges? Ok, since the OnMove event isn´t fired when you move around the form and put it back on it´s original position, you can save the static variables... void __fastcall TfrmMain::OnFormMove(TWMMove aMsg) { int Right = Left + Width; int Bottom = Top + Height; int BottomBorder = Screen->WorkAreaTop+Screen->WorkAreaHeight; int RightBorder = Screen->WorkAreaLeft+Screen->WorkAreaWidth; if(Left>0 || !AllowOutside){ if(Screen->WorkAreaLeft+SNAP_DIF_X >= Left) Left = Screen->WorkAreaLeft; } if(Right<RightBorder || !AllowOutside){ if(Right >= RightBorder-SNAP_DIF_X) Left = RightBorder-Width; } if(Top>0 || !AllowOutside){ if(Screen->WorkAreaTop+SNAP_DIF_X >= Top) Top = Screen->WorkAreaTop; } if(Bottom<BottomBorder || !AllowOutside){ if(Bottom >= BottomBorder-SNAP_DIF_Y) Top = BottomBorder-Height; } } Back to top Dirk Schnitzler Guest Posted: Thu Mar 24, 2005 4:33 pm    Post subject: Re: Forms Docking to Desktop edges? I hope this is the last time .... Change it to: if(Top>0 || !AllowOutside){ if(Screen->WorkAreaTop+SNAP_DIF_Y >= Top) Top = Screen->WorkAreaTop; } Instead of: Quote: if(Top>0 || !AllowOutside){ if(Screen->WorkAreaTop+SNAP_DIF_X >= Top) Top = Screen->WorkAreaTop; } Regards, Dirk. 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