(转)Inno Setup入门（十七）——Inno Setup类参考（3）

本文转载自：http://blog.csdn.net/yushanddddfenghailin/article/details/17250993

标签（Label）是用来显示文本的主要组件之一，也是窗口应用程序中最常用的组件之一，通过对标签的使用，将能够给用户提供更加详细的信息。

Pascal脚本中的标签由类TlLabel实现，该类定义如下：

TLabel = class(TCustomLabel)

property Alignment: TAlignment; read write;

property AutoSize: Boolean; read write;

property Caption: String; read write;

property Color: TColor; read write;

property FocusControl: TWinControl; read write;

property Font: TFont; read write;

property WordWrap: Boolean; read write;

property OnClick: TNotifyEvent; read write;

property OnDblClick: TNotifyEvent; read write;

end;

和Tbutton的层次结构模型不同，该类的层次模型如下：

下面将在上一节的基础上添加一个标签，并在单击按钮之后标签内容出现相应的变化：

[setup]

AppName=Test

AppVerName=TEST

DefaultDirName="E:\TEST"

AppVersion=1.0

[files]

Source: "F:\desktop\test\ipmsg.exe";Flags:dontcopy

[code]

var

myPage:TwizardPage;

myBtn:TButton;

myLbl:TLabel;

procedure ClickmyBtn(Sender: TObject);

begin

myLbl.Caption:='你点击了按钮~';

myLbl.Color:=clRed;

end;

procedure InitializeWizard();

begin

myPage:=CreateCustomPage(wpWelcome, '标题：自定义页面', '描述：这是我的自定义页面');

myBtn:=TButton.Create(myPage);

myBtn.Parent:=myPage.Surface;

myBtn.Caption:='点我~';

myBtn.OnClick:=@ClickmyBtn;

myLbl:=TLabel.Create(myPage);

myLbl.Parent:=myPage.Surface;

myLbl.Top:=myBtn.Top+50;

myLbl.Caption:='我是标签~';

end;

该代码中主要用到了Label的Caption属性，该属性决定了标签所要显示的文本。属性Color用于设置标签的背景颜色，myLbl.Color:=clRed;将设置标签的背景色为红色，有一个专门的Tcolor类处理关于颜色的属性，更多预定义颜色可查找Delphi相关文档，以下是支持的颜色：

clSystemColor = $FF000000;

clScrollBar = TColor(clSystemColor or COLOR_SCROLLBAR);

clBackground = TColor(clSystemColor or COLOR_BACKGROUND);

clActiveCaption = TColor(clSystemColor or COLOR_ACTIVECAPTION);

clInactiveCaption = TColor(clSystemColor or COLOR_INACTIVECAPTION);

clMenu = TColor(clSystemColor or COLOR_MENU);

clWindow = TColor(clSystemColor or COLOR_WINDOW);

clWindowFrame = TColor(clSystemColor or COLOR_WINDOWFRAME);

clMenuText = TColor(clSystemColor or COLOR_MENUTEXT);

clWindowText = TColor(clSystemColor or COLOR_WINDOWTEXT);

clCaptionText = TColor(clSystemColor or COLOR_CAPTIONTEXT);

clActiveBorder = TColor(clSystemColor or COLOR_ACTIVEBORDER);

clInactiveBorder = TColor(clSystemColor or COLOR_INACTIVEBORDER);

clAppWorkSpace = TColor(clSystemColor or COLOR_APPWORKSPACE);

clHighlight = TColor(clSystemColor or COLOR_HIGHLIGHT);

clHighlightText = TColor(clSystemColor or COLOR_HIGHLIGHTTEXT);

clBtnFace = TColor(clSystemColor or COLOR_BTNFACE);

clBtnShadow = TColor(clSystemColor or COLOR_BTNSHADOW);

clGrayText = TColor(clSystemColor or COLOR_GRAYTEXT);

clBtnText = TColor(clSystemColor or COLOR_BTNTEXT);

clInactiveCaptionText = TColor(clSystemColor or COLOR_INACTIVECAPTIONTEXT);

clBtnHighlight = TColor(clSystemColor or COLOR_BTNHIGHLIGHT);

cl3DDkShadow = TColor(clSystemColor or COLOR_3DDKSHADOW);

cl3DLight = TColor(clSystemColor or COLOR_3DLIGHT);

clInfoText = TColor(clSystemColor or COLOR_INFOTEXT);

clInfoBk = TColor(clSystemColor or COLOR_INFOBK);

clHotLight = TColor(clSystemColor or COLOR_HOTLIGHT);

clGradientActiveCaption = TColor(clSystemColor or COLOR_GRADIENTACTIVECAPTION);

clGradientInactiveCaption = TColor(clSystemColor or COLOR_GRADIENTINACTIVECAPTION);

clMenuHighlight = TColor(clSystemColor or COLOR_MENUHILIGHT);

clMenuBar = TColor(clSystemColor or COLOR_MENUBAR);

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);

StandardColorsCount = 16;

clMoneyGreen = TColor($C0DCC0);

clSkyBlue = TColor($F0CAA6);

clCream = TColor($F0FBFF);

clMedGray = TColor($A4A0A0);

ExtendedColorsCount = 4;

clNone = TColor($1FFFFFFF);

clDefault = TColor($20000000);

上述代码运行后效果如下：

点击前

点击后

注意：修改标签文字颜色需要使用标签的Font属性。另外，标签也可以对鼠标的点击做出反应，执行相应的函数，标签支持双击和单击鼠标的事件，但是要注意这两个事件不能并存，测试代码如下：

[code]

var

myPage:TwizardPage;

myBtn:TButton;

myLbl:TLabel;

procedure ClickmyBtn(Sender: TObject);

begin

myLbl.Caption:='你点击了按钮~';

myLbl.Color:=clRed;

end;

procedure ClickMyLbl(Sender: TObject);

begin

MsgBox('你单击了标签', MBInformation, MB_OK);

end;

procedure DbClickMyLbl(Sender: TObject);

begin

MsgBox('你双击了标签', MBInformation, MB_OK);

end;

procedure InitializeWizard();

begin

myPage:=CreateCustomPage(wpWelcome, '标题：自定义页面', '描述：这是我的自定义页面');

myBtn:=TButton.Create(myPage);

myBtn.Parent:=myPage.Surface;

myBtn.Caption:='点我~';

myBtn.OnClick:=@ClickmyBtn;

myLbl:=TLabel.Create(myPage);

myLbl.Parent:=myPage.Surface;

myLbl.Top:=myBtn.Top+50;

myLbl.Caption:='我是标签~';

myLbl.OnDblClick:=@DbClickMyLbl;

//myLbl.OnClick:=@ClickMyLbl;

end;

上面的代码在双击标签时会弹出一个对话框，如果我们把倒数第二行的注释取消，则双击事件并不能被安装程序捕获，因为当用户点击一次鼠标左键后一旦松开鼠标，将会捕获单击事件，而不是再等待双击的到来，这点一定要注意，不过通常标签主要还是用于显示文本，而不是对某些事件做出反应，总之，标签的Caption属性是最重要的。