77 lines
1.8 KiB
ObjectPascal
77 lines
1.8 KiB
ObjectPascal
unit CustomDrawControl;
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interface
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uses
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Classes, Controls, Messages, Windows, Graphics;
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type
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TCustomDrawControl = class(TCustomControl)
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private
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FOnPaint: TNotifyEvent;
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FOnLeave: TNotifyEvent;
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procedure WMEraseBkgnd(var Message: TWMEraseBkgnd); message WM_ERASEBKGND;
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procedure WMSetFocus(var Message: TWMSetFocus); message WM_SETFOCUS;
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procedure WMKillFocus(var Message: TWMKillFocus); message WM_KILLFOCUS;
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procedure WMGetDlgCode(var Message: TMessage); message WM_GETDLGCODE;
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procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
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protected
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public
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procedure Paint; override;
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property OnPaint: TNotifyEvent read FOnPaint write FOnPaint;
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property Canvas;
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property OnDblClick;
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property OnKeyDown;
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// property OnKeyPress;
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property OnKeyUp;
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property OnMouseDown;
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property OnMouseMove;
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property OnMouseUp;
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property OnMouseWheel;
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// property OnMouseWheelDown;
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// property OnMouseWheelUp;
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property OnEnter;
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property OnExit;
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property OnMouseLeave: TNotifyEvent read FOnLeave write FOnLeave;
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end;
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implementation
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procedure TCustomDrawControl.WMEraseBkgnd(var Message: TWMEraseBkgnd);
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begin
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Message.Result := 1;
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end;
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procedure TCustomDrawControl.WMSetFocus(var Message: TWMSetFocus);
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begin
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Invalidate;
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end;
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procedure TCustomDrawControl.WMKillFocus(var Message: TWMKillFocus);
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begin
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if assigned(OnExit) then OnExit(self);
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Invalidate;
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end;
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procedure TCustomDrawControl.WMGetDlgCode(var Message: TMessage);
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begin
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inherited;
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Message.Result := Message.Result or DLGC_WANTARROWS;
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end;
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procedure TCustomDrawControl.CMMouseLeave(var Message: TMessage);
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begin
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if Assigned(FOnLeave) then FOnLeave(Self);
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end;
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procedure TCustomDrawControl.Paint;
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begin
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if Assigned(FOnPaint) then FOnPaint(Self);
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end;
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end.
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