可以禁止com框某些项目的例子.rar_ExtendedComboBox

// ExtendedComboBox.cpp : implementation file // #include "stdafx.h" #include "listtest.h" #include "ExtendedComboBox.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif const UINT nMessage=::RegisterWindowMessage("ComboSelEndOK"); ///////////////////////////////////////////////////////////////////////////// // CExtendedComboBox CExtendedComboBox::CExtendedComboBox() { m_ListBox.SetParent(this); } CExtendedComboBox::~CExtendedComboBox() { } // default implementation BOOL CExtendedComboBox::IsItemEnabled(UINT nIndex) const { if (nIndex>=(DWORD)GetCount()) return TRUE; // whatever DWORD uData=GetItemData(nIndex); return (uData&1); } BEGIN_MESSAGE_MAP(CExtendedComboBox, CComboBox) //{{AFX_MSG_MAP(CExtendedComboBox) ON_WM_CHARTOITEM() ON_CONTROL_REFLECT(CBN_SELENDOK, OnSelendok) //}}AFX_MSG_MAP ON_MESSAGE(WM_CTLCOLORLISTBOX, OnCtlColor) ON_REGISTERED_MESSAGE(nMessage, OnRealSelEndOK) END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CExtendedComboBox message handlers void CExtendedComboBox::PreSubclassWindow() { // TODO: Add your specialized code here and/or call the base class ASSERT((GetStyle()&(CBS_OWNERDRAWFIXED|CBS_HASSTRINGS))==(CBS_OWNERDRAWFIXED|CBS_HASSTRINGS)); CComboBox::PreSubclassWindow(); } void CExtendedComboBox::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) { // TODO: Add your code to draw the specified item CDC* pDC = CDC::FromHandle (lpDrawItemStruct->hDC); if (((LONG)(lpDrawItemStruct->itemID) >= 0) && (lpDrawItemStruct->itemAction & (ODA_DRAWENTIRE | ODA_SELECT))) { BOOL fDisabled = !IsWindowEnabled () || !IsItemEnabled(lpDrawItemStruct->itemID); COLORREF newTextColor = fDisabled ? RGB(0x80, 0x80, 0x80) : GetSysColor (COLOR_WINDOWTEXT); // light gray COLORREF oldTextColor = pDC->SetTextColor (newTextColor); COLORREF newBkColor = GetSysColor (COLOR_WINDOW); COLORREF oldBkColor = pDC->SetBkColor (newBkColor); if (newTextColor == newBkColor) newTextColor = RGB(0xC0, 0xC0, 0xC0); // dark gray if (!fDisabled && ((lpDrawItemStruct->itemState & ODS_SELECTED) != 0)) { pDC->SetTextColor (GetSysColor (COLOR_HIGHLIGHTTEXT)); pDC->SetBkColor (GetSysColor (COLOR_HIGHLIGHT)); } CString strText; GetLBText(lpDrawItemStruct->itemID, strText); const RECT &rc=lpDrawItemStruct->rcItem; pDC->ExtTextOut(rc.left + 2, rc.top + 2,// + max(0, (cyItem - m_cyText) / 2), ETO_OPAQUE, &rc, strText, strText.GetLength (), NULL); pDC->SetTextColor (oldTextColor); pDC->SetBkColor (oldBkColor); } else if ((LONG)(lpDrawItemStruct->itemID)<0) // drawing edit text { COLORREF newTextColor = GetSysColor (COLOR_WINDOWTEXT); // light gray COLORREF oldTextColor = pDC->SetTextColor (newTextColor); COLORREF newBkColor = GetSysColor (COLOR_WINDOW); COLORREF oldBkColor = pDC->SetBkColor (newBkColor); if ((lpDrawItemStruct->itemState & ODS_SELECTED) != 0) { pDC->SetTextColor (GetSysColor (COLOR_HIGHLIGHTTEXT)); pDC->SetBkColor (GetSysColor (COLOR_HIGHLIGHT)); } CString strText; GetWindowText(strText); const RECT &rc=lpDrawItemStruct->rcItem; pDC->ExtTextOut(rc.left + 2, rc.top + 2,// + max(0, (cyItem - m_cyText) / 2), ETO_OPAQUE, &rc, strText, strText.GetLength (), NULL); pDC->SetTextColor (oldTextColor); pDC->SetBkColor (oldBkColor); } if ((lpDrawItemStruct->itemAction & ODA_FOCUS) != 0) pDC->DrawFocusRect(&lpDrawItemStruct->rcItem); } void CExtendedComboBox::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct) { // TODO: Add your code to determine the size of specified item UNREFERENCED_PARAMETER(lpMeasureItemStruct); } int CExtendedComboBox::OnCharToItem(UINT nChar, CListBox* pListBox, UINT nIndex) { // TODO: Add your message handler code here and/or call default int ret=CComboBox::OnCharToItem(nChar, pListBox, nIndex); if (ret>=0 && !IsItemEnabled(ret)) return -2; else return ret; } void CExtendedComboBox::OnSelendok() { // TODO: Add your control notification handler code here GetWindowText(m_strSavedText); PostMessage(nMessage); } LRESULT CExtendedComboBox::OnRealSelEndOK(WPARAM,LPARAM) { CString currentText; GetWindowText(currentText); int index=FindStringExact(-1,currentText); if (index>=0 && !IsItemEnabled(index)) { SetWindowText(m_strSavedText); GetParent()->SendMessage(WM_COMMAND,MAKELONG(GetWindowLong(m_hWnd,GWL_ID),CBN_SELCHANGE),(LPARAM)m_hWnd); } return 0; } LRESULT CExtendedComboBox::OnCtlColor(WPARAM,LPARAM lParam) { if (m_ListBox.m_hWnd==NULL && lParam!=0 && lParam!=(LPARAM)m_hWnd) m_ListBox.SubclassWindow((HWND)lParam); return Default(); } void CExtendedComboBox::PostNcDestroy() { // TODO: Add your specialized code here and/or call the base class // m_ListBox.UnsubclassWindow(); m_ListBox.Detach(); CComboBox::PostNcDestroy(); } ///////////////////////////////////////////////////////////////////////////// // CListBoxInsideComboBox CListBoxInsideComboBox::CListBoxInsideComboBox() { m_Parent=NULL; } CListBoxInsideComboBox::~CListBoxInsideComboBox() { } BEGIN_MESSAGE_MAP(CListBoxInsideComboBox, CWnd) //{{AFX_MSG_MAP(CListBoxInsideComboBox) ON_WM_LBUTTONUP() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CListBoxInsideComboBox message handlers void CListBoxInsideComboBox::OnLButtonUp(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default CRect rect; GetClientRect(rect); if (rect.PtInRect(point)) { BOOL outside=FALSE; int index=((CListBox *)this)->ItemFromPoint(point,outside); if (!outside && !m_Parent->IsItemEnabled(index)) return; // don't click there } CWnd::OnLButtonUp(nFlags, point); } void CListBoxInsideComboBox::SetParent(CExtendedComboBox *ptr) { m_Parent=ptr; }