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75 lines
1.9 KiB
ObjectPascal
75 lines
1.9 KiB
ObjectPascal
unit PaintBoxExt;
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interface
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uses
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Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
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ExtCtrls,Buttons,CanvasPanel;
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type
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TPaintBoxExt = class(TPaintbox)
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private
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{ Private declarations }
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FOnMouseLeave: TNotifyEvent;
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FOnMiddleDblClick: TNotifyEvent;
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protected
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{ Protected declarations }
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procedure CMMouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
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procedure WMMButtonDblClk(var Message: TWMMButtonDblClk); message WM_MBUTTONDBLCLK;
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procedure MouseWheelHandler(var Message: TMessage); override;
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public
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{ Public declarations }
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Wnd: HWND;
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Constructor Create(AOwner:TComponent);override;
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property WheelAccumulator;
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published
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{ Published declarations }
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(*Property OnMouseMove;
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Property OnClick;
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Property OnDblClick;
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Property OnDragDrop;
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Property OnEndDrag;
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Property OnDragOver;
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Property OnStartDrag;
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Property OnMouseUp;
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Property OnMouseDown;
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*)
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property OnMouseLeave:TNotifyEvent read FOnMouseLeave write FOnMouseLeave;
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property OnMiddleDblClick:TNotifyEvent read FOnMiddleDblClick write FOnMiddleDblClick;
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property OnMouseWheel;
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end;
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implementation
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Procedure TPaintBoxExt.CMMouseLeave(var Message: TMessage);
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begin
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if assigned(FOnMouseLeave) then FOnMouseLeave(self);
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end;
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constructor TPaintBoxExt.Create(AOwner: TComponent);
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begin
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inherited;
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//ControlStyle := ControlStyle - [csOpaque];
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end;
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procedure TPaintBoxExt.MouseWheelHandler(var Message: TMessage);
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begin
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//Form := GetParentForm(Self);
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//if (Form <> nil) and (Form <> Self) then Form.MouseWheelHandler(TMessage(Message))
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//else
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with TMessage(Message) do
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Result := Perform(CM_MOUSEWHEEL, WParam, LParam);
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end;
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procedure TPaintBoxExt.WMMButtonDblClk(var Message: TWMMButtonDblClk);
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begin
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FOnMiddleDblClick(Self);
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end;
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end.
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