📄 csdn_文档中心_wtl for mfc programming实践篇 --- 一个自定义combobox的移植过程(上).htm
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</SPAN>--- </SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">一个自定义<SPAN
lang=EN-US>ComboBox</SPAN>的移植过程<SPAN lang=EN-US><?xml:namespace
prefix = o ns = "urn:schemas-microsoft-com:office:office"
/><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 4">
</SPAN>--- </SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">蜗牛手记<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">现在有一个<SPAN
lang=EN-US>MFC</SPAN>写的自定义<SPAN lang=EN-US>ComboBox</SPAN>打算移植到<SPAN
lang=EN-US>WTL</SPAN>上，于是根据<SPAN
lang=EN-US>WTL</SPAN>的书写方法修改了程序，就得到下面的代码：<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">Class CComboBoxEx
: public CComboBox<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">{<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">protected:<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1"> </SPAN>void
OnDrawItem(UINT wParam, LPDRAWITEMSTRUCT
lpDrawItemStruct);<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">public:<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN>BEGIN_MSG_MAP_EX(CComboBoxEx)<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 2">
</SPAN>MSG_OCM_DRAWITEM(OnDrawItem)<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN>END_MSG_MAP()<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">}<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">Class CMainDlg :
public CDialogImpl< CMainDlg ><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">{<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">Protected:<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 2">
</SPAN>CComboBoxEx<SPAN
style="mso-tab-count: 2">
</SPAN>m_cmbEx;<SPAN style="mso-tab-count: 1">
</SPAN><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">Public:<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN>BEGIN_DDX_MAP(CPageConfigFont)<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 2">
</SPAN>DDX_CONTROL_HANDLE(IDC_COMBOBOXEX,
m_cmbEx);<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN>END_DDX_MAP()<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1">
</SPAN>BEGIN_MSG_MAP_EX(CPageConfigFont)<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 2">
</SPAN>MSG_WM_INITDIALOG(OnInitDialog)<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 2">
</SPAN>REFLECT_NOTIFICATIONS()<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 2">
</SPAN>END_MSG_MAP()<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">}<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">如何生成以上代码及代码的含义，原书都有介绍，由于不是本文的重点，不再一一解释。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">要说的是，在<SPAN lang=EN-US>WTL
7.1</SPAN>中添加了<SPAN
lang=EN-US>DDX_CONTROL_HANDLE</SPAN>宏，可以用来设置控件，与<SPAN
lang=EN-US>DDX_CONTROL</SPAN>不同的是，它不要求控件类由<SPAN
lang=EN-US>CWindowImpl</SPAN>派生，即不需要包含<SPAN
lang=EN-US>SubclassWindow()</SPAN>函数，这样我们才可以使用<SPAN
lang=EN-US>DDX</SPAN>来设置我们从<SPAN
lang=EN-US>CComboBox</SPAN>派生的类（听上去很有道理，其实却是在<SPAN
lang=EN-US>MFC</SPAN>编程习惯带动下错误思维）。<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">当然，要实现还有一个小小的问题，<SPAN
lang=EN-US>DDX_CONTROL_HANDLE</SPAN>宏需要我们的类包含一个操作符“<SPAN
lang=EN-US>=</SPAN>”，怎么写这个函数呢？参看了一下基类的实现方法：<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN>CComboBoxExT< TBase >& operator =(HWND
hWnd)<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN>{<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 2">
</SPAN>m_hWnd = hWnd;<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 2">
</SPAN>return *this;<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1">
</SPAN>}<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 63pt; TEXT-INDENT: 21pt"><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">参看<SPAN
lang=EN-US>WTL</SPAN>文件<SPAN
lang=EN-US><atlctrls.h><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">原来只是将<SPAN
lang=EN-US>m_hWnd</SPAN>赋值，于是我们在我们的类中添加如下的代码：<SPAN
lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt"><SPAN lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">CComboBoxEx&
operator=(HWND hWnd)<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt">{<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1"> </SPAN>m_hWnd =
hWnd;<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US style="FONT-FAMILY: 宋体; FONT-SIZE: 9pt"><SPAN
style="mso-tab-count: 1"> </SPAN>return
*this;<o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd"><SPAN
lang=EN-US
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