| 1 | Unit SplitBar;
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| 2 |
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| 3 | Interface
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| 4 |
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| 5 | Uses
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| 6 | Classes, Forms, ExtCtrls, Graphics;
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| 7 |
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| 8 | Type
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| 9 | TSplitChange = procedure( NewSplit: longint ) of Object;
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| 10 |
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| 11 | TSplitBar=Class(TPanel)
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| 12 | Protected
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| 13 | FOldFgMode: TPenMode;
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| 14 | FOldPanelX: longint;
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| 15 | FOffset: longint;
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| 16 | FMinimum: longint;
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| 17 | FMaximum: longint;
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| 18 |
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| 19 | FOnChange: TSplitChange;
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| 20 |
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| 21 | Function GetX( XInParent: longint ): longint;
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| 22 | Procedure DrawSplitLine( X: longint );
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| 23 | Procedure SetupComponent; Override;
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| 24 | Procedure MouseDown( Button: TMouseButton;
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| 25 | Shift: TShiftState;
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| 26 | X: LongInt; Y: LongInt ); override;
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| 27 | Procedure MouseMove( Shift: TShiftState;
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| 28 | X: LongInt; Y: LongInt); override;
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| 29 | Procedure MouseUp( Button: TMouseButton;
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| 30 | Shift: TShiftState;
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| 31 | X: LongInt; Y: LongInt); override;
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| 32 |
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| 33 | Protected
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| 34 | Procedure SetMinimum( Minimum: longint );
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| 35 | Procedure SetMaximum( Maximum: longint );
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| 36 | Protected
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| 37 | // Hide some properties
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| 38 | property Caption;
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| 39 | property Align;
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| 40 | property Alignment;
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| 41 | property DragCursor;
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| 42 | property DragMode;
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| 43 | property Font;
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| 44 | property ParentFont;
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| 45 | property PenColor;
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| 46 | property ParentPenColor;
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| 47 |
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| 48 | property OnCanDrag;
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| 49 | property OnDragDrop;
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| 50 | property OnDragOver;
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| 51 | property OnEndDrag;
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| 52 | property OnFontChange;
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| 53 | property OnMouseDown;
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| 54 | property OnMouseMove;
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| 55 | property OnMouseUp;
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| 56 | property OnStartDrag;
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| 57 | Public
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| 58 | Destructor Destroy; Override;
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| 59 | published
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| 60 | property Minimum: longint read FMinimum write SetMinimum;
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| 61 | property Maximum: longint read FMaximum write SetMaximum;
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| 62 | property OnChange: TSplitChange read FOnChange write FOnChange;
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| 63 |
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| 64 | End;
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| 65 |
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| 66 | Exports
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| 67 | TSplitBar,'User','SplitBar.bmp';
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| 68 |
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| 69 | Implementation
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| 70 |
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| 71 | Procedure TSplitBar.SetupComponent;
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| 72 | Begin
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| 73 | Inherited SetupComponent;
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| 74 | Width:= 6;
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| 75 | BevelWidth:= 2;
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| 76 | FMinimum:= 0;
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| 77 | FMaximum:= -1; // maximum in parent
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| 78 | Caption:= '';
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| 79 | Name:= 'SplitBar';
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| 80 | Cursor:= crHSplit;
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| 81 | End;
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| 82 |
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| 83 | Destructor TSplitBar.Destroy;
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| 84 | Begin
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| 85 | Inherited Destroy;
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| 86 | End;
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| 87 |
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| 88 | Procedure TSplitBar.SetMinimum( Minimum: longint );
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| 89 | begin
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| 90 | FMinimum:= Minimum;
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| 91 | if Left < Minimum then
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| 92 | Left:= Minimum;
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| 93 | end;
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| 94 |
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| 95 | Procedure TSplitBar.SetMaximum( Maximum: longint );
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| 96 | begin
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| 97 | FMaximum:= Maximum;
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| 98 | if Left > Maximum then
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| 99 | Left:= Maximum;
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| 100 | end;
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| 101 |
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| 102 | Function TSplitBar.GetX( XInParent: longint ): longint;
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| 103 | begin
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| 104 | Result:= Left + XInParent - FOffset;
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| 105 | if Result < FMinimum then
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| 106 | Result:= FMinimum;
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| 107 | if Result < 0 then
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| 108 | Result:= 0;
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| 109 |
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| 110 | if FMaximum <> -1 then
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| 111 | begin
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| 112 | if Result > FMaximum then
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| 113 | Result:= FMaximum;
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| 114 | end;
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| 115 | if Result > ( Parent.ClientWidth - Width ) then
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| 116 | Result:= Parent.ClientWidth - Width;
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| 117 | end;
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| 118 |
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| 119 | Procedure TSplitBar.DrawSplitLine( X: longint );
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| 120 | var
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| 121 | ClientPoint, ScreenPoint: TPoint;
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| 122 | r: TRect;
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| 123 | begin
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| 124 | ClientPoint.x:= X;
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| 125 | ClientPoint.y:= Bottom;
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| 126 | ScreenPoint:= Parent.ClientToScreen( ClientPoint );
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| 127 | r.Left:= ScreenPoint.X;
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| 128 | r.Bottom:= ScreenPoint.Y;
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| 129 | r.Top:= ScreenPoint.Y + Height - 1;
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| 130 | r.Right:= ScreenPoint.X + Width - 1;
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| 131 | Screen.Canvas.Box( r );
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| 132 | end;
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| 133 |
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| 134 | Procedure TSplitBar.MouseUp( Button: TMouseButton;
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| 135 | Shift: TShiftState;
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| 136 | X: LongInt; Y: LongInt);
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| 137 | Begin
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| 138 | if not MouseCapture then
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| 139 | exit;
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| 140 |
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| 141 | // final erase of cursor
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| 142 | DrawSplitLine( FOldPanelX );
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| 143 | MouseCapture:= false;
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| 144 |
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| 145 | Left:= GetX( X );
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| 146 | if FOnChange <> nil then
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| 147 | FOnChange( Left );
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| 148 | End;
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| 149 |
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| 150 | Procedure TSplitBar.MouseMove( Shift: TShiftState;
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| 151 | X: LongInt; Y: LongInt);
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| 152 | Begin
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| 153 | if not MouseCapture then
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| 154 | exit;
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| 155 |
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| 156 | // erase cursor
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| 157 | DrawSplitLine( FOldPanelX );
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| 158 |
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| 159 | X:= GetX( X );
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| 160 |
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| 161 | FOldPanelX:= X;
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| 162 |
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| 163 | // draw new cursor
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| 164 | DrawSplitLine( X );
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| 165 |
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| 166 | End;
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| 167 |
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| 168 | Procedure TSplitBar.MouseDown( Button: TMouseButton;
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| 169 | Shift: TShiftState;
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| 170 | X: LongInt; Y: LongInt );
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| 171 | Begin
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| 172 | if Button <> mbLeft then
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| 173 | exit;
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| 174 |
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| 175 | MouseCapture:= true;
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| 176 | FOldFgMode := Screen.Canvas.Pen.Mode;
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| 177 |
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| 178 | Screen.Canvas.Pen.Mode := pmNot;
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| 179 |
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| 180 | // Store the offset within the control that the mouse was clicked
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| 181 | FOffset:= X;
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| 182 |
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| 183 | X:= Left;
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| 184 |
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| 185 | // Draw cursor
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| 186 | DrawSplitLine( X );
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| 187 |
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| 188 | FOldPanelX:= X;
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| 189 | End;
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| 190 |
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| 191 | Initialization
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| 192 | {Register classes}
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| 193 | RegisterClasses([TSplitBar]);
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| 194 | End.
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| 195 |
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