增强Delphi的TStatusBar控件

unit StatusBarEx; 

interface 

uses 
Windows, Messages, SysUtils, Classes, Graphics, 
Controls, Forms, Dialogs, ComCtrls, DsgnIntf; 

type 

//定义About属性的属性编辑器 
TAbout = class(TPropertyEditor) 
public 
  procedure Edit; override; 
  function GetAttributes: TPropertyAttributes; override; 
  function GetValue: string; override; 
end; 

//定义TStatusBarEx控件 
TStatusBarEx = class(TStatusBar) 
private 
  { Private declarations } 
  FAbout:TAbout; 
protected 
  { Protected declarations } 
public 
  { Public declarations } 
  constructor Create(AOwner: TComponent); override; 
published 
  { Published declarations } 
property About: TAbout read FAbout; 
end; 

procedure Register; 

implementation 

constructor TStatusBarEx.Create(AOwner: TComponent); 
begin 
inherited Create(AOwner); 

{为了让TStatusBarEx控件能接受其它控件，必须 
使ControlStyle属性（集合类型）包含csAcceptsControls元素} 
ControlStyle:= ControlStyle + [csAcceptsControls]; 
end; 

//以下是TAbout中的成员函数的实现 
procedure TAbout.Edit; 
begin 
Application.MessageBox(‘TStatusBarEx for Delphi 5‘#13#10 
           +‘Written by Simon Liu‘#13#10 
           +‘Email:simon_liu@263.net‘, 
           ‘About TStatusBarEx‘,MB_ICONINFORMATION); 
end; 

function TAbout.GetAttributes: TPropertyAttributes; 
begin 
Result := [paDialog, paReadOnly]; 
end; 

function TAbout.GetValue: string; 
begin 
Result := ‘(Simon)‘; 
end; 

procedure Register; 
begin 
//将TStatusBarEx控件注册到Delphi 5控件板的Win32页上 
RegisterComponents(‘Win32‘, [TStatusBarEx]); 

//为About属性注册属性编辑器 
RegisterPropertyEditor(typeInfo(TAbout), TStatusBar, 
            ‘About‘, TAbout); 
end; 

end. 

使用TStatusBarEx控件，我们可以非常容易地在StatusBar上增添其它的内容了。比如，如果想要在状态条上显示一个图片，只要在TStatusBarEx控件上放一个Image控件；想要添加一个进度条，只需在上面加一个ProgressBar就行了！

dsgnintf.pas单元在D6及D7中找不到的解决方法

1.加入搜索路径

C:\Program Files\Borland\Delphi7\Source\ToolsAPI

2.打开

C:\Program Files\Borland\Delphi7\Source\ToolsAPI\DesignEditors.pas

3.找到并把

uses
  Types, SysUtils, Classes, TypInfo, Variants, DesignIntf, DesignMenus,Proxies;改为
uses
  Types, SysUtils, Classes, TypInfo, Variants, DesignIntf, DesignMenus{,Proxies};

4.找到并把

if (FAncestor = nil) and (Component <> Designer.Root)
        and IsProxyClass(Component.ClassType) then
改为
      if (FAncestor = nil) and (Component <> Designer.Root)
        {and IsProxyClass(Component.ClassType)} then

5.找到并把

  while IsProxyClass(ComponentClass) do
改为
  //while IsProxyClass(ComponentClass) do

6.保存,编译运行,OK

上面3.4.5.就是把Proxies单元从DesignEditors单元中剔除,DesignEditors单元
中只有两个地方引用了Proxies单元的函数,而且是同一个函数:IsProxyClass,把
这两个地方注释掉就可以了.

增强Delphi的TStatusBar控件

原文：https://blog.51cto.com/alun51cto/2508912