ListBox自画条目背景和文字颜色地

// XListBox.cpp // // Author: Hans Dietrich // hdietrich2@hotmail.com // // This software is released into the public domain. // You are free to use it in any way you like. // // This software is provided "as is" with no expressed // or implied warranty. I accept no liability for any // damage or loss of business that this software may cause. // // Notes on use: To use in an MFC project, first create // a listbox using the standard dialog editor. // Be sure to mark the listbox as OWNERDRAW // FIXED, and check the HAS STRINGS box. // Using Class Wizard, create a variable for // the listbox. Finally, manually edit the // dialog's .h file and replace CListBox with // CXListBox, and #include XListBox.h. // /////////////////////////////////////////////////////////////////////////////// #include "stdafx.h" #include "XListBox.h" #include "Clipboard.h" #ifdef _DEBUG #undef THIS_FILE static char BASED_CODE THIS_FILE[] = __FILE__; #endif // NOTE - following table must be kept in sync with ColorPickerCB.cpp static COLORREF ColorTable[16] = { RGB( 0, 0, 0), // Black RGB(255, 255, 255), // White RGB(128, 0, 0), // Maroon RGB( 0, 128, 0), // Green RGB(128, 128, 0), // Olive RGB( 0, 0, 128), // Navy RGB(128, 0, 128), // Purple RGB( 0, 128, 128), // Teal RGB(192, 192, 192), // Silver RGB(128, 128, 128), // Gray RGB(255, 0, 0), // Red RGB( 0, 255, 0), // Lime RGB(255, 255, 0), // Yellow RGB( 0, 0, 255), // Blue RGB(255, 0, 255), // Fuschia RGB( 0, 255, 255) }; // Aqua BEGIN_MESSAGE_MAP(CXListBox, CListBox) //{{AFX_MSG_MAP(CXListBox) ON_WM_LBUTTONDBLCLK() ON_WM_CONTEXTMENU() ON_COMMAND(ID_EDIT_SELECT_ALL, OnEditSelectAll) ON_COMMAND(ID_EDIT_COPY, OnEditCopy) ON_COMMAND(ID_EDIT_CLEAR, OnEditClear) //}}AFX_MSG_MAP END_MESSAGE_MAP() #define new DEBUG_NEW ///////////////////////////////////////////////////////////////////////////// // CXListBox CXListBox::CXListBox() { m_ColorWindow = ::GetSysColor(COLOR_WINDOW); m_ColorHighlight = ::GetSysColor(COLOR_HIGHLIGHT); m_ColorWindowText = ::GetSysColor(COLOR_WINDOWTEXT); m_ColorHighlightText = ::GetSysColor(COLOR_HIGHLIGHTTEXT); m_bColor = TRUE; m_cxExtent = 0; m_nTabPosition = 8; // tab stops every 8 columns m_nSpaceWidth = 7; m_nContextMenuId = (UINT)-1; for (int i = 0; i < MAXTABSTOPS; i++) m_nTabStopPositions[i] = (i+1) * m_nTabPosition * m_nSpaceWidth; } CXListBox::~CXListBox() { } ////////////////////////////////////////////////////////////////////////////// // MeasureItem void CXListBox::MeasureItem(LPMEASUREITEMSTRUCT) { } ////////////////////////////////////////////////////////////////////////////// // CompareItem int CXListBox::CompareItem(LPCOMPAREITEMSTRUCT) { return 0; } ////////////////////////////////////////////////////////////////////////////// // DrawItem void CXListBox::DrawItem(LPDRAWITEMSTRUCT lpDIS) { COLORREF oldtextcolor, oldbackgroundcolor; CDC* pDC = CDC::FromHandle(lpDIS->hDC); pDC->GetCharWidth((UINT) ' ', (UINT) ' ', &m_nSpaceWidth); pDC->GetCharWidth((UINT) 'c', (UINT) 'c', &m_nAveCharWidth); for (int i = 0; i < MAXTABSTOPS; i++) m_nTabStopPositions[i] = (i+1) * m_nAveCharWidth * m_nTabPosition; // draw focus rectangle when no items in listbox if (lpDIS->itemID == (UINT)-1) { if (lpDIS->itemAction & ODA_FOCUS) pDC->DrawFocusRect(&lpDIS->rcItem); return; } else { int selChange = lpDIS->itemAction & ODA_SELECT; int focusChange = lpDIS->itemAction & ODA_FOCUS; int drawEntire = lpDIS->itemAction & ODA_DRAWENTIRE; if (selChange || drawEntire) { BOOL sel = lpDIS->itemState & ODS_SELECTED; int nLen = CListBox::GetTextLen(lpDIS->itemID); if (nLen != LB_ERR) { char *buf = new char [nLen + 10]; ASSERT(buf); if (buf && (GetTextWithColor(lpDIS->itemID, (LPSTR)buf) != LB_ERR)) { // set text color from first character in string - // NOTE: 1 was added to color index to avoid asserts by CString int itext = int (buf[0] - 1); // set background color from second character in string - // NOTE: 1 was added to color index to avoid asserts by CString int iback = int (buf[1] - 1); buf[0] = ' '; buf[1] = ' '; COLORREF textcolor = sel ? m_ColorHighlightText : ColorTable[itext]; oldtextcolor = pDC->SetTextColor(textcolor); COLORREF backgroundcolor = sel ? m_ColorHighlight : ColorTable[iback]; oldbackgroundcolor = pDC->SetBkColor(backgroundcolor); // fill the rectangle with the background color the fast way pDC->ExtTextOut(0, 0, ETO_OPAQUE, &lpDIS->rcItem, NULL, 0, NULL); pDC->TabbedTextOut(lpDIS->rcItem.left, lpDIS->rcItem.top, &buf[2], strlen(&buf[2]), MAXTABSTOPS, (LPINT)m_nTabStopPositions, 0); CSize size; size = pDC->GetOutputTextExtent(&buf[2]); int nScrollBarWidth = ::GetSystemMetrics(SM_CXVSCROLL); size.cx += nScrollBarWidth; // in case of vertical scrollbar int cxExtent = (size.cx > m_cxExtent) ? size.cx : m_cxExtent; if (cxExtent > m_cxExtent) { m_cxExtent = cxExtent; SetHorizontalExtent(m_cxExtent+(m_cxExtent/32)); } } if (buf) delete [] buf; } } if (focusChange || (drawEntire && (lpDIS->itemState & ODS_FOCUS))) pDC->DrawFocusRect(&lpDIS->rcItem); } } ////////////////////////////////////////////////////////////////////////////// // GetTextWithColor - get text string with color bytes int CXListBox::GetTextWithColor(int nIndex, LPTSTR lpszBuffer) const { if (!::IsWindow(m_hWnd)) { ASSERT(FALSE); return LB_ERR; } ASSERT(lpszBuffer); lpszBuffer[0] = 0; return CListBox::GetText(nIndex, lpszBuffer); } ////////////////////////////////////////////////////////////////////////////// // GetTextWithColor - get text string with color bytes void CXListBox::GetTextWithColor(int nIndex, CString& rString) const { if (!::IsWindow(m_hWnd)) { ASSERT(FALSE); return; } rString.Empty(); CListBox::GetText(nIndex, rString); } ////////////////////////////////////////////////////////////////////////////// // GetText - for compatibility with CListBox (no color bytes) int CXListBox::GetText(int nIndex, LPTSTR lpszBuffer) const { if (!::IsWindow(m_hWnd)) { ASSERT(FALSE); return LB_ERR; } ASSERT(lpszBuffer); lpszBuffer[0] = 0; int nRet = CListBox::GetText(nIndex, lpszBuffer); int n = strlen(lpszBuffer); if (n > 2) memcpy(&lpszBuffer[0], &lpszBuffer[2], n-1); // copy nul too return nRet; } ////////////////////////////////////////////////////////////////////////////// // GetText - for compatibility with CListBox (no color bytes) void CXListBox::GetText(int nIndex, CString& rString) const { if (!::IsWindow(m_hWnd)) { ASSERT(FALSE); return; } CString str; str.Empty(); CListBox::GetText(nIndex, str); if ((!str.IsEmpty()) && (str.GetLength() > 2)) rString = str.Mid(2); else rString.Empty(); } ////////////////////////////////////////////////////////////////////////////// // GetTextLen - for compatibility with CListBox (no color bytes) int CXListBox::GetTextLen(int nIndex) const { if (!::IsWindow(m_hWnd)) { ASSERT(FALSE); return LB_ERR; } int n = CListBox::GetTextLen(nIndex); if (n != LB_ERR && n >= 2) n -= 2; return n; } ////////////////////////////////////////////////////////////////////////////// // SearchString int CXListBox::SearchString(int nStartAfter, LPCTSTR lpszItem,