【转载】Inno Setup入门(二十四)——Inno Setup类参考(10)

    xiaoxiao2021-03-25  152

    这里介绍一下FolderTreeView 类。 TFolderTreeView = class(TCustomFolderTreeView)   property OnChange: TNotifyEvent; read write;   property OnRename: TFolderRenameEvent; read write; end; 而TCustomFolderTreeView又继承自TWinControl,所以和其他基本控件一样具有许多类似的属性,此处不再重复。 贴出代码段: [code] var myPage:TWizardPage;   ftv: TFolderTreeView; procedure InitializeWizard(); begin     myPage:=CreateCustomPage(wpWelcome, '标题:自定义页面', '描述:这是我的自定义页面');     ftv := TFolderTreeView.Create(myPage);     ftv.Width := myPage.SurfaceWidth;     ftv.Height := myPage.SurfaceHeight;     ftv.Parent := myPage.Surface;     ftv.Directory := ExpandConstant('{win}'); end; 有必要对 ExpandConstant进行解释一下。该函数的原型为: function ExpandConstant(const S: String): String; 描述为:Changes all constants in S to their values. For example, ExpandConstant('{srcexe}') is changed to the filename of Setup.An exception will be raised if there was an error expanding the constants. 即将字符串常量展开为所对于的路径字符串。常用的常量有{app}、{win}、{sys}、{src}、{dotnet20}等,避免了手动输入的麻烦。 运行效果如下:   另外,该类支持一个OnChange的事件,当文件夹被修改时触发。 [code] var myPage:TWizardPage;   ftv: TFolderTreeView; lbl: TLabel; procedure ChangeDir(Sender: TObject); begin   lbl.Caption:=ftv.Directory; 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');     lbl:=TLabel.Create(myPage);     lbl.Parent:=myPage.Surface;          ftv := TFolderTreeView.Create(myPage);     ftv.Top:=lbl.Height+5;     ftv.Width := myPage.SurfaceWidth;     ftv.Height := myPage.SurfaceHeight-20;     ftv.Parent := myPage.Surface;     ftv.Directory := ExpandConstant('{win}');     ftv.OnChange:=@ChangeDir;     lbl.Caption:=ftv.Directory;    end; 这次运行的效果如下:  可见标签的值和文件夹的值保持一致。  
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