乐之网站制作,电影打卡WordPress模板,课程网站开发开题报告,常州网站制作报价MFC 中#xff0c; ListBox 与 ComboBox 中的项在设置了高度的情况下如何实现文本的水平居中与垂直居中#xff1f;#xff1f;#xff1f;ListBox 与 ComboBox 中的数据均为动态添加文本内容含有数字、英文、中文void CMyComboBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemS…MFC 中 ListBox 与 ComboBox 中的项在设置了高度的情况下如何实现文本的水平居中与垂直居中ListBox 与 ComboBox 中的数据均为动态添加文本内容含有数字、英文、中文void CMyComboBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct){ASSERT(lpDrawItemStruct-CtlType  ODT_COMBOBOX);LPCTSTR lpszText  (LPCTSTR) lpDrawItemStruct-itemData;ASSERT(lpszText ! NULL);CDC dc;dc.Attach(lpDrawItemStruct-hDC);// Save these value to restore them when done drawing.COLORREF crOldTextColor  dc.GetTextColor();COLORREF crOldBkColor  dc.GetBkColor();// If this item is selected, set the background color// and the text color to appropriate values. Erase// the rect by filling it with the background color.if ((lpDrawItemStruct-itemAction  ODA_SELECT) (lpDrawItemStruct-itemState   ODS_SELECTED)){dc.SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));dc.SetBkColor(::GetSysColor(COLOR_HIGHLIGHT));dc.FillSolidRect(lpDrawItemStruct-rcItem, ::GetSysColor(COLOR_HIGHLIGHT));}else{dc.FillSolidRect(lpDrawItemStruct-rcItem, crOldBkColor);}// Draw the text.dc.DrawText(lpszText,(int)_tcslen(lpszText),lpDrawItemStruct-rcItem,DT_CENTER|DT_SINGLELINE|DT_VCENTER);// Reset the background color and the text color back to their// original values.dc.SetTextColor(crOldTextColor);dc.SetBkColor(crOldBkColor);dc.Detach();}只能自绘。。。具体应用的时候我们往往不能满足于MFC提供的标准功能这种情况下我们一般会对控件进行重载定制对于ComboBox自然也不例外。不过ComboBox略显复杂它本身还包括子控件要想完全重载就要对这些子控件同样进行定制。有经验的朋友一定知道这个时候我们需要对这些子控件进行子类化用我们自己的类去代替。微软同样为我们想到了这一点在上文提到的链接中介绍说如果要重载ComboBox可以通过一篇文章《How to subclass CListBox and CEdit inside of CComboBox》介绍的方法来实现。这篇文章用的方法是通过OnCtlColor来实现对子控件的子类化的应该说这个方法很巧妙但并不优雅而且文章中也提到这个方法必须在ComboBox至少绘制一次的基础上才能起作用对于一些要求在这之前就要实现替换的需求并不适用文章相关原文如下Note that for subclassing to occur, the dialog box must be painted at least once. There are cases when the dialog box doesnt paint at all (for example, closing the dialog box before it is displayed, hidden dialog boxes). This method may not be suitable when access to the subclassed windows are needed in these cases.那么有什么更好的方法实现ComboBox对其子控件的子类化么本文就是要解决这个问题。要实现子类化其实只要解决一个问题那就是过去要子类化的控件的句柄。我们知道ComboBox的信息都封装到了COMBOBOXINFO这个结构中通过ComboBox的成员函数GetComboBoxInfo即可获取这些信息。看一下这个结构的定义[cpp] view plaincopy/** Combobox information*/typedef struct tagCOMBOBOXINFO{DWORD cbSize;RECT rcItem;RECT rcButton;DWORD stateButton;HWND hwndCombo;HWND hwndItem;HWND hwndList;} COMBOBOXINFO, *PCOMBOBOXINFO, *LPCOMBOBOXINFO;我们发现hwndItem和hwndList应该就是我们想要的。然后我们要为子类化选择一个合适的时间对于控件来说在PreSubclassWindow函数中处理再合适不过了。这样我们就很好的解决了子类化的途径和时机的问题动手试一下吧我重载重载了CComboBox做了测试为了验证子类化是否成功我没有对ComboBox进行初始化而是通过子类化的新控件完成的核心代码如下[cpp] view plaincopyvoid CExComboBox::PreSubclassWindow(){CComboBox::PreSubclassWindow();COMBOBOXINFO    comboInfo;//获取控件信息comboInfo.cbSize sizeof(COMBOBOXINFO);GetComboBoxInfo(comboInfo);//子类化编辑框if(comboInfo.hwndItem ! NULL){m_editReplace.SubclassWindow(comboInfo.hwndItem);m_editReplace.SetWindowText(_T(编辑框已被子类化));}//子类化列表框if(comboInfo.hwndList ! NULL){m_listboxReplace.SubclassWindow(comboInfo.hwndList);m_listboxReplace.AddString(_T(列表框已被子类化));}}运行程序成功实现目的。我整理了一个小例子有兴趣的朋友可以下载研究一下不过大家也能看得出来功能和实现都比较简单所以其实这个实例的价值也不是很大。个人认为这个方案相对来说比较合理对于动态创建的控件可通过OnCreate函数来完成子类化。找到了合理的子类化途径我们也就可以更好的对ComboBox做自绘和扩展以实现更加丰富的功能。Following is a owner drawn Combo Box which will be filled with the names of the fonts.. And each entry is in same font as selected. This is something similar to the one in Netscape 4.x font selector.This is pretty simple. All it does is to enumerate the fonts and store the LOGFONTs in the Item data. and when the painting is to be done, takes the value from the Item data and paints the item..It has a very nice effect.. Since this does only the font names, you might need another combobox for the sizes..Post-Migration Risks of Office 365 Download NowYou can also set the colors for the highlight and normal..To use this, Create a ComboBox in your Resource Editor, Set the Owner draw to Variable and check the Has strings.Then, In the OnInitDialog () or OnInitialUpdate() call the function FillFonts (). Thats it.. You have got your fonts in the Combo box. To get the selected font, Use GetSelFont () with LOGFONT as the argument. this argument will be filled in upon return.P.S:If you make the ComboBox to be a Drop down List then the edit window (actually the static control window) will hav the name in the same font as selected.. Otherwise, it will be in the dialog boxs font..//*************************************************************************//CCustComboBox.h#if !defined(AFX_CUSTCOMBOBOX_H__F8528B4F_396E_11D1_9384_00A0248F6145__INCLUDED_)#define AFX_CUSTCOMBOBOX_H__F8528B4F_396E_11D1_9384_00A0248F6145__INCLUDED_#if _MSC_VER 1000#pragma once#endif // _MSC_VER 1000// CustComboBox.h : header file///////// CCustComboBox windowtypedef enum {FONTS} STYLE;      //Why have I enumerated, Cos, Maybe I might want something other than Fonts hereclass CCustComboBox : public CComboBox{// Constructionpublic:CCustComboBox();CCustComboBox (STYLE);// Attributespublic:void SetHilightColors (COLORREF hilight,COLORREF hilightText){m_clrHilight hilight;m_clrHilightText hilightText;};void SetNormalColors (COLORREF clrBkgnd,COLORREF clrText){m_clrNormalText clrText;m_clrBkgnd clrBkgnd;};static BOOL CALLBACK EnumFontProc (LPLOGFONT lplf, LPTEXTMETRIC lptm, DWORD dwType, LPARAM lpData);void FillFonts ();int  GetSelFont (LOGFONT);// Operationspublic:// Overrides// ClassWizard generated virtual function overrides//{{AFX_VIRTUAL(CCustComboBox)public:virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct);protected:virtual void PreSubclassWindow();//}}AFX_VIRTUAL// Implementationpublic:virtual ~CCustComboBox();// Generated message map functionsprotected:STYLE m_enStyle;COLORREF m_clrHilight;COLORREF m_clrNormalText;COLORREF m_clrHilightText;COLORREF m_clrBkgnd;BOOL m_bInitOver;void DrawDefault (LPDRAWITEMSTRUCT);void DrawFont(LPDRAWITEMSTRUCT);void InitFonts ();//{{AFX_MSG(CCustComboBox)afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);afx_msg void OnDestroy();//}}AFX_MSGafx_msg   long OnInitFonts (WPARAM, LPARAM);DECLARE_MESSAGE_MAP()};///////{{AFX_INSERT_LOCATION}}// Microsoft Developer Studio will insert additional declarations immediately before the previous line.#endif //!defined(AFX_CUSTCOMBOBOX_H__F8528B4F_396E_11D1_9384_00A0248F6145__INCLUDED_)//**************************************************************************// CustComboBox.cpp : implementation file//#include stdafx.h#include CustComboBox.h#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] __FILE__;#endif#define WM_INITFONTS          (WM_USER 123)//I chose 123 cos nobody might use the same exact number.. I can improve this by use RegisterWindowMessage../////// CCustComboBox//Initial values of the text and highlight stuffCCustComboBox::CCustComboBox(){m_enStyle FONTS;m_clrHilight GetSysColor (COLOR_HIGHLIGHT);m_clrNormalText GetSysColor (COLOR_WINDOWTEXT);m_clrHilightText GetSysColor (COLOR_HIGHLIGHTTEXT);m_clrBkgnd GetSysColor (COLOR_WINDOW);m_bInitOver FALSE;}CCustComboBox::CCustComboBox (STYLE enStyle){m_enStyle enStyle;m_clrHilight GetSysColor (COLOR_HIGHLIGHT);m_clrNormalText GetSysColor (COLOR_WINDOWTEXT);m_clrHilightText GetSysColor (COLOR_HIGHLIGHTTEXT);m_clrBkgnd GetSysColor (COLOR_WINDOW);m_bInitOver FALSE;}CCustComboBox::~CCustComboBox(){}BEGIN_MESSAGE_MAP(CCustComboBox, CComboBox)//{{AFX_MSG_MAP(CCustComboBox)ON_WM_CREATE()ON_WM_DESTROY()//}}AFX_MSG_MAPON_MESSAGE (WM_INITFONTS,OnInitFonts)END_MESSAGE_MAP()/////// CCustComboBox message handlersvoid CCustComboBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct){//I might want to add something else somedayswitch (m_enStyle){case FONTS:DrawFont(lpDrawItemStruct);break;}}//I dont need the MeasureItem to do anything. Whatever the system says, it staysvoid CCustComboBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct){}void CCustComboBox::DrawFont(LPDRAWITEMSTRUCT lpDIS){CDC* pDC CDC::FromHandle(lpDIS-hDC);CRect rect;TRACE0 (In Draw Font\n);// draw the colored rectangle portionrect.CopyRect(lpDIS-rcItem);pDC-SetBkMode( TRANSPARENT );if (lpDIS-itemState ODS_SELECTED){pDC-FillSolidRect (rect,m_clrHilight);pDC-SetTextColor (m_clrHilightText);}else{pDC-FillSolidRect (rect,m_clrBkgnd);pDC-SetTextColor (m_clrNormalText);}if ((int)(lpDIS-itemID) 0) // Well its negetive so no need to draw text{}else{CString strText;GetLBText (lpDIS-itemID,strText);CFont newFont;CFont *pOldFont;((LOGFONT*)lpDIS-itemData)-lfHeight 90; //9 point size((LOGFONT*)lpDIS-itemData)-lfWidth 0;newFont.CreatePointFontIndirect ((LOGFONT*)lpDIS-itemData);pOldFont pDC-SelectObject (newFont);pDC-DrawText(strText, rect, DT_LEFT | DT_VCENTER | DT_SINGLELINE);pDC-SelectObject (pOldFont);newFont.DeleteObject ();}}void CCustComboBox::InitFonts (){CDC *pDC GetDC ();ResetContent (); //Delete whatever is thereEnumFonts (pDC-GetSafeHdc(),NULL,(FONTENUMPROC) EnumFontProc,(LPARAM)this);//Enumeratem_bInitOver TRUE;}BOOL CALLBACK CCustComboBox::EnumFontProc (LPLOGFONT lplf, LPTEXTMETRIC lptm, DWORD dwType, LPARAM lpData){if (dwType TRUETYPE_FONTTYPE) //Add only TTF fellows, If you want you can change it to check for others{int index ((CCustComboBox *) lpData)-AddString(lplf-lfFaceName);LPLOGFONT lpLF;lpLF new LOGFONT;CopyMemory ((PVOID) lpLF,(CONST VOID *) lplf,sizeof (LOGFONT));((CCustComboBox *) lpData)-SetItemData (index,(DWORD) lpLF);}return TRUE;}int CCustComboBox::OnCreate(LPCREATESTRUCT lpCreateStruct){if (CComboBox::OnCreate(lpCreateStruct) -1)return -1;// TODO: Add your specialized creation code hereif (m_enStyle FONTS){PostMessage (WM_INITFONTS,0,0);}return 0;}long CCustComboBox::OnInitFonts (WPARAM, LPARAM){InitFonts ();return 0L;}void CCustComboBox::OnDestroy(){if (m_enStyle FONTS){int nCount;nCount GetCount ();for (int i 0; i {delete ((LOGFONT*)GetItemData (i)); //delete the LOGFONTS actually created..}}// TODO: Add your message handler code hereCComboBox::OnDestroy();}void CCustComboBox::FillFonts (){m_enStyle FONTS;PostMessage (WM_INITFONTS,0,0); //Process in one place}int  CCustComboBox::GetSelFont (LOGFONT lf){int index GetCurSel ();if (index LB_ERR)return LB_ERR;LPLOGFONT lpLF (LPLOGFONT) GetItemData (index);CopyMemory ((PVOID)lf, (CONST VOID *) lpLF, sizeof (LOGFONT));return index; //return the index here.. Maybe the user needs it:-)}void CCustComboBox::PreSubclassWindow(){// TODO: Add your specialized code here and/or call the base class//Tried to do what Roger Onslow did for the button.. Did not work..?? Any RD guys around :-)}CommentsgoodPosted by xixihaha on 12/02/2010 05:50amso nice ,hahahReplyHow Can I do Dynamic Creation of a ComboBoxPosted by subbaraovnrt on 12/15/2004 07:59amIn a Dialog box I used one Push Button When I press that button New Combobox Dynamically created but the all font in that ComboBox all are same bold Arial.How my Dialog box behaves as static your implementation.ReplyHow to initalize the Font combobox after FillFonts()Posted by Legacy on 11/14/2001 12:00amOriginally posted by: Chris HambletonTo initalize the Font combobox after FillFonts(), simply change the PostMessage() calls to SendMessage().PostMessage() returns as soon as the message is posted (while the combobox is still empty), but SendMessage() returns only after the message has been handled (after the combobox has been filled).The reason youre currently unable to initialize the Font combobox is because youre calling SetCurSel() / SetString() on a combobox thats currently empty.Hope this helps!!ReplyHow do you intialize the editor box?Posted by Legacy on 11/05/2001 12:00amOriginally posted by: ButchGreat.But how do you initialize the editor box portion of the combo to say a default font selection?Thanks.Reply!!!Posted by Legacy on 07/11/2001 12:00amOriginally posted by: Chethana SastryThis is great. I could finish a weeks work in just 15 mins!Thanks!I have a problem though...If i say SetCurSel(0) it fails and returns -1Have you encountered the same problem? If so, what is the solution?ReplysuperPosted by Legacy on 02/08/2001 12:00amOriginally posted by: pierresuper!!its worksReplyGreat !Posted by Legacy on 05/01/2000 12:00amOriginally posted by: Ergin SalihThis is wonderful, it is easily modified to work off a listof font objects.Exactly what I wanted.Thanks