subject_27117.htm

一些关于vc的问答

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序号：27117 发表者：听雨舟 发表日期：2003-01-08 16:18:16
<br>主题：高手帮忙看一下，下段代码中为何要用SetButtonInfo
<br>内容：int MainFrame::CreateMyToolBar()<BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;#define COMBO_BOX_WIDTH 80 //the width of the combo box<BR>&nbsp;&nbsp;&nbsp;&nbsp;//set up the ComboBox control as a select box<BR>//First get the index of the button's<BR> position in the toolbar<BR>int index = 0;<BR>CRecr rect;<BR>while(m_wndToolBar.GetItemID(index)!<BR>= ID_MY_COMBO_BOX) index++;<BR>//next convert that button to a <BR>seperator and get its position<BR>m_wndToolBar.SetButtonInfo(index,<BR> ID_MY_COMBO_BOX, TBBS_SEPARATOR, COMBO_BOX_WIDTH);<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_wndToolBar.GetItemRect(index, &amp;rect);<BR>//expand the rectangle to allow the <BR>combo box room to drop down<BR>&nbsp;&nbsp;&nbsp;&nbsp;rect.top+=2;<BR>&nbsp;&nbsp;&nbsp;&nbsp;rect.bottom += 200;<BR>&nbsp;&nbsp;&nbsp;&nbsp;// then .Create the combo box and show it<BR>&nbsp;&nbsp;&nbsp;&nbsp;if (!m_wndToolBar.m_ wndMyComboBox.Create(<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WS_CHILD|WS_VISIBLE | CBS_AUTOHSCROLL | <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CBS_DROPDOWNLIST | CBS_HASSTRINGS ,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;rect, &amp;m_wndToolBar, IDC_MY_COMBO))<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TRACE0("Failed to create combo-box\n");<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_wndToolBar.m_wndMyComboBox.ShowWindow(SW_SHOW);<BR>&nbsp;&nbsp;&nbsp;&nbsp;//adding string to the combo box<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_wndToolBar.m_wndMyComboBox.AddString("Fisrt Select");<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_wndToolBar.m_wndMyComboBox.AddString("Second Select");<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_wndToolBar.m_wndMyComboBox.AddString("Third Select");<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_wndToolBar.m_wndMyComboBox.AddString("Fourth Select");<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_wndToolBar.m_wndMyComboBox.AddString("Fifth Select");<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_wndToolBar.m_wndMyComboBox.SetCurSel(0);<BR>}<BR><BR>
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<font color=red>答案被接受</font><br>回复者：石松 回复日期：2003-01-08 19:08:53
<br>内容：这段代码的目的是为了将组合框加入工具栏，用SetButtonInfo的目的是为了分析在组合框前是否有分隔符！因为有分隔符和没有分隔符所占的位置大小是不同的。
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