📄 c++ builder 程序设计实用教程 - 3_2_1 菜单及其概述 - 张晋 - 17xie.htm
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lang=EN-US>FormCreate()</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">事件处理过程中，并且添加如下所示的程序初始化代码：</SPAN></P>
<P class=a0><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">void
__fastcall TForm1::FormCreate(TObject *Sender)<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">{<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">Form1->Copy1->Enabled=true;<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">Form1->Paste1->Enabled=false;<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">//</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">初始化菜单项的有效状态</SPAN><SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">}<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">//-----------------------------------------------------------------------<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">程序说明：</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在程序运行的初期，在剪贴板上还没有可以利用的数据，所以要通过语句</SPAN><SPAN
lang=EN-US>Form1->Paste1->Enabled=false;</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">把子菜单项</SPAN><SPAN
lang=EN-US>Paste</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设置为无效的状态。</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在程序运行的过程中，当用户用鼠标的左键单击子菜单项</SPAN><SPAN
lang=EN-US>Copy</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，系统的剪贴板就会带有数据，所以子菜单项</SPAN><SPAN
lang=EN-US>Paste</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">就要变为有效的状态。</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在代码窗口中找到子菜单项的响应事件</SPAN><SPAN
lang=EN-US>Copy1Click()</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，并且添加如下的菜单响应代码：</SPAN></P>
<P class=a0><SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">void
__fastcall TForm1::Copy1Click(TObject *Sender)<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">{<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">Form1->Copy1->Enabled=true;<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">Form1->Paste1->Enabled=true;<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">//</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">鼠标单击后改变菜单项的状态</SPAN><SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">}<o:p></o:p></SPAN></P>
<P class=a0><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">//-----------------------------------------------------------------------<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">做完以上的工作后，存储文件，按键盘上的功能键</SPAN><SPAN
lang=EN-US>F9</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">运行程序，结果如下：</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">首先</SPAN><SPAN
lang=EN-US>Paste</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">菜单项显灰色，是无效的（如图</SPAN><SPAN
lang=EN-US>3-26</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）；但是，单击</SPAN><SPAN
lang=EN-US>Copy</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">菜单项后，</SPAN><SPAN
lang=EN-US>Paste</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">菜单项就有效了（如图</SPAN><SPAN
lang=EN-US>3-27</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）。</SPAN></P>
<P class=a><SPAN lang=EN-US><IMG height=214
src="C++ Builder 程序设计实用教程 - 3_2_1 菜单及其概述 - 张晋 - 17xie.files/0639bb8fbf.jpg"
width=293 v:shapes="_x0000_i1038"></SPAN></P>
<P class=MsoCaption><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN
lang=EN-US>3-26<SPAN style="mso-spacerun: yes"> </SPAN>Paste</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">菜单项无效</SPAN></P>
<P class=a><SPAN lang=EN-US><IMG height=221
src="C++ Builder 程序设计实用教程 - 3_2_1 菜单及其概述 - 张晋 - 17xie.files/785bb81ef2.jpg"
width=302 v:shapes="_x0000_i1039"></SPAN></P>
<P class=MsoCaption><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN
lang=EN-US>3-27<SPAN style="mso-spacerun: yes"> </SPAN>Paste</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">菜单项有效</SPAN></P>
<P class=MsoNormal><SPAN
lang=EN-US><o:p> </o:p></SPAN></P></DIV></DIV></CENTER>
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