在OnMouseDown事件中，button的值怎么表示？

[8341]

1、左键是什么？右键是什么？
if button=? then

2、还有，象Tcolor等这些常量在哪里查？

3、canvas的pen.style或brush.style的值都是什么？在哪里查？有一个异或性质的画图是什么？

[debussy]

1.procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
if Button = mbLeft then Showmessage('You clicked left button!');
end;
2.TColor,你只要在Delphi IDE里面按住Ctrl，点击TColor就明白了。1问也是如此

3。见2

[iroi]

1.左：mbLeft 右：mbRight
2.在帮助中敲TCOLOR
3。在帮助中查啊，
TPenMode = (pmBlack, pmWhite, pmNop, pmNot, pmCopy, pmNotCopy, pmMergePenNot, pmMaskPenNot, pmMergeNotPen, pmMaskNotPen, pmMerge, pmNotMerge, pmMask, pmNotMask, pmXor, pmNotXor)

其实这些东西，帮助中写得很清楚啊！

[debussy]

Controls.PAS第453行：
TMouseButton = (mbLeft, mbRight, mbMiddle);
Graphics.pas第23行:
TColor = -$7FFFFFFF-1..$7FFFFFFF;
const
clScrollBar = TColor(COLOR_SCROLLBAR or $80000000);
clBackground = TColor(COLOR_BACKGROUND or $80000000);
clActiveCaption = TColor(COLOR_ACTIVECAPTION or $80000000);
clInactiveCaption = TColor(COLOR_INACTIVECAPTION or $80000000);
clMenu = TColor(COLOR_MENU or $80000000);
clWindow = TColor(COLOR_WINDOW or $80000000);
clWindowFrame = TColor(COLOR_WINDOWFRAME or $80000000);
clMenuText = TColor(COLOR_MENUTEXT or $80000000);
clWindowText = TColor(COLOR_WINDOWTEXT or $80000000);
clCaptionText = TColor(COLOR_CAPTIONTEXT or $80000000);
clActiveBorder = TColor(COLOR_ACTIVEBORDER or $80000000);
clInactiveBorder = TColor(COLOR_INACTIVEBORDER or $80000000);
clAppWorkSpace = TColor(COLOR_APPWORKSPACE or $80000000);
clHighlight = TColor(COLOR_HIGHLIGHT or $80000000);
clHighlightText = TColor(COLOR_HIGHLIGHTTEXT or $80000000);
clBtnFace = TColor(COLOR_BTNFACE or $80000000);
clBtnShadow = TColor(COLOR_BTNSHADOW or $80000000);
clGrayText = TColor(COLOR_GRAYTEXT or $80000000);
clBtnText = TColor(COLOR_BTNTEXT or $80000000);
clInactiveCaptionText = TColor(COLOR_INACTIVECAPTIONTEXT or $80000000);
clBtnHighlight = TColor(COLOR_BTNHIGHLIGHT or $80000000);
cl3DDkShadow = TColor(COLOR_3DDKSHADOW or $80000000);
cl3DLight = TColor(COLOR_3DLIGHT or $80000000);
clInfoText = TColor(COLOR_INFOTEXT or $80000000);
clInfoBk = TColor(COLOR_INFOBK or $80000000);

clBlack = TColor($000000);
clMaroon = TColor($000080);
clGreen = TColor($008000);
clOlive = TColor($008080);
clNavy = TColor($800000);
clPurple = TColor($800080);
clTeal = TColor($808000);
clGray = TColor($808080);
clSilver = TColor($C0C0C0);
clRed = TColor($0000FF);
clLime = TColor($00FF00);
clYellow = TColor($00FFFF);
clBlue = TColor($FF0000);
clFuchsia = TColor($FF00FF);
clAqua = TColor($FFFF00);
clLtGray = TColor($C0C0C0);
clDkGray = TColor($808080);
clWhite = TColor($FFFFFF);
clNone = TColor($1FFFFFFF);
clDefault = TColor($20000000);

[8341]

我的帮助里都没有啊！
多谢多谢！