68731.htm

在天极网上发布的各类delphi原码及技巧文档

 begin<br>
 </p>
 <blockquote> 
 <p> ShowMessage('正在处理...');<br>
 Handled := True;<br>
 ...<br>
 </p>
 </blockquote>
 <p> end;<br>
 </p>
 </blockquote>
 </blockquote>
 <p> end;<br>
 ....<br>
 </p>
 <blockquote> 
 <p>　　 当我们处理的事务比较多并且可分组，以上的做法就比较烦琐，这时就应该定义成多个 MF_POPUP ，其各个子菜单除了uIDNewItem 传递这个子菜单的句柄外，另外独特之处在于消息过滤器的 Msg.wParam 是各个菜单项的 Command。这个Command是在构建 TPopupMenu 时就定义了。无论是否是 MenuItem 或 PopupMenu，其Command的值都是顺序递增的。以下是一范例： <br>
 unit Unit1;<br>
 interface<br>
 uses Windows, Messages, SysUtils, Classes, Graphics, Controls, 
 Forms, <br>
 Dialogs, Menus；<br>
 type<br>
 </p>
 <blockquote> 
 <p> TForm1 = class(TForm)<br>
&nbsp;&nbsp;&nbsp;&nbsp; PopupMenu1: TPopupMenu;<br>
&nbsp;&nbsp;&nbsp;&nbsp; N1: TMenuItem; // Caption := '范例一';<br>
&nbsp;&nbsp;&nbsp;&nbsp; N2: TMenuItem; // Caption := '范例二';<br>
&nbsp;&nbsp;&nbsp;&nbsp; N3: TMenuItem; // Caption := '范例三';<br>
&nbsp;&nbsp;&nbsp;&nbsp; procedure FormCreate(Sender: TObject);<br>
 ...<br>
 private<br>
 </p>
 <blockquote> 
 <p> { Private declarations }<br>
 // 我的消息过滤器<br>
 procedure OnAppMessage(var Msg: TMsg; var Handled: Boolean);<br>
 ...<br>
 </p>
 </blockquote>
 <p> public<br>
 </p>
 <blockquote> 
 <p> { Public declarations }<br>
 ...<br>
 </p>
 </blockquote>
 <p> end;<br>
 ...<br>
 <br>
 var<br>
 Form1: TForm1;<br>
 implementation<br>
 {$R *.DFM}<br>
 procedure TForm1.FormCreate(Sender: TObject);<br>
 begin<br>
 </p>
 <blockquote> 
 <p> Application.OnMessage := OnAppMessage; //定义自己的消息处理过程<br>
 // 定义一分割线 <br>
 AppendMenu(GetSystemMenu(Application.Handle, FALSE), MF_SEPARATOR, 
 0, '');<br>
 // 定义'提交'子菜单<br>
 AppendMenu(GetSystemMenu(Application.Handle, FALSE), MF_POPUP,<br>
 PopupMenu1.Handle,'提交');<br>
 </p>
 </blockquote>
 <p> end;<br>
 <br>
 procedure TForm1.OnAppMessage(var Msg: TMsg; var Handled: 
 Boolean);<br>
 begin<br>
 // 定制自己的消息处理过程<br>
 if (Msg.message = WM_SYSCOMMAND) AND (Msg.wParam &#60; WM_USER) 
 then<br>
 begin<br>
 </p>
 <blockquote> 
 <p> Case Msg.wParam of<br>
 // N1.Command = 1<br>
 1:ShowMessage('范例一 Command:'+ IntToStr(N1.Command));<br>
 // N1.Command = 2<br>
 2:ShowMessage('范例二 Command:'+ IntToStr(N2.Command));<br>
 // N1.Command = 3<br>
 3:ShowMessage('范例三 Command:'+ IntToStr(N3.Command));<br>
 </p>
 </blockquote>
 <p> end;<br>
 Handled := True;<br>
 </p>
 </blockquote>
 <p> end;<br>
 ...<br>
 </p>
 </blockquote>
 <p>end;<br>
 ...<br>
 </p>
 <p> 　　可以看出，MF_STRING 与 MF_POPUP 在消息处理机制上是稍微有点不同的，另外，如果要在菜单前面加上图标的话，这在Delphi 4.x、Delphi 5.x 版本下是不成问题，如果是在 Delphi 3.x 下的话，只要定义成自绘 MenuItem即可，不过稍许复杂了一点。在应用过程中，需要提醒的是，这几组定义不能一起使用:</p>
 <blockquote> 
 <p> A. MF_DISABLED, MF_ENABLED, 和 MF_GRAYED <br>
 B. MF_BITMAP, MF_STRING, 和 MF_OWNERDRAW <br>
 C. MF_MENUBARBREAK 和 MF_MENUBREAK <br>
 D. MF_CHECKED 和 MF_UNCHECKED</p>
 </blockquote>
 








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