www.pudn.com > ColorLBTest.rar > ColorListBox.cpp
// ColorListBox.cpp : implementation file
//-------------------------------------------------------------------
//
// CColorListBox class -
// A CListBox-derived class with optional colored items.
//
// Version: 1.0 01/10/1998 Copyright © Patrice Godard
//
// Version: 2.0 09/17/1999 Copyright © Paul M. Meidinger
//
//-------------------------------------------------------------------
#include "stdafx.h"
#include "ColorListBox.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CColorListBox
//-------------------------------------------------------------------
//
CColorListBox::CColorListBox()
//
// Return Value: None.
//
// Parameters : None.
//
// Remarks : Standard constructor.
//
{
} // CColorListBox
//-------------------------------------------------------------------
//
CColorListBox::~CColorListBox()
//
// Return Value: None.
//
// Parameters : None.
//
// Remarks : Destructor.
//
{
} // ~CColorListBox()
BEGIN_MESSAGE_MAP(CColorListBox, CListBox)
//{{AFX_MSG_MAP(CColorListBox)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CColorListBox message handlers
//-------------------------------------------------------------------
//
void CColorListBox::DrawItem(LPDRAWITEMSTRUCT lpDIS)
//
// Return Value: None.
//
// Parameters : lpDIS - A long pointer to a DRAWITEMSTRUCT structure
// that contains information about the type of drawing required.
//
// Remarks : Called by the framework when a visual aspect of
// an owner-draw list box changes.
//
{
if ((int)lpDIS->itemID < 0)
return;
CDC* pDC = CDC::FromHandle(lpDIS->hDC);
COLORREF crText;
CString sText;
COLORREF crNorm = (COLORREF)lpDIS->itemData; // Color information is in item data.
COLORREF crHilite = RGB(255-GetRValue(crNorm), 255-GetGValue(crNorm), 255-GetBValue(crNorm));
// If item has been selected, draw the highlight rectangle using the item's color.
if ((lpDIS->itemState & ODS_SELECTED) &&
(lpDIS->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)))
{
CBrush brush(crNorm);
pDC->FillRect(&lpDIS->rcItem, &brush);
}
// If item has been deselected, draw the rectangle using the window color.
if (!(lpDIS->itemState & ODS_SELECTED) && (lpDIS->itemAction & ODA_SELECT))
{
CBrush brush(::GetSysColor(COLOR_WINDOW));
pDC->FillRect(&lpDIS->rcItem, &brush);
}
// If item has focus, draw the focus rect.
if ((lpDIS->itemAction & ODA_FOCUS) && (lpDIS->itemState & ODS_FOCUS))
pDC->DrawFocusRect(&lpDIS->rcItem);
// If item does not have focus, redraw (erase) the focus rect.
if ((lpDIS->itemAction & ODA_FOCUS) && !(lpDIS->itemState & ODS_FOCUS))
pDC->DrawFocusRect(&lpDIS->rcItem);
// Set the background mode to TRANSPARENT to draw the text.
int nBkMode = pDC->SetBkMode(TRANSPARENT);
// If the item's color information is set, use the highlight color
// gray text color, or normal color for the text.
if (lpDIS->itemData)
{
if (lpDIS->itemState & ODS_SELECTED)
crText = pDC->SetTextColor(crHilite);
else if (lpDIS->itemState & ODS_DISABLED)
crText = pDC->SetTextColor(::GetSysColor(COLOR_GRAYTEXT));
else
crText = pDC->SetTextColor(crNorm);
}
// Else the item's color information is not set, so use the
// system colors for the text.
else
{
if (lpDIS->itemState & ODS_SELECTED)
crText = pDC->SetTextColor(::GetSysColor(COLOR_HIGHLIGHTTEXT));
else if (lpDIS->itemState & ODS_DISABLED)
crText = pDC->SetTextColor(::GetSysColor(COLOR_GRAYTEXT));
else
crText = pDC->SetTextColor(::GetSysColor(COLOR_WINDOWTEXT));
}
// Get and display item text.
GetText(lpDIS->itemID, sText);
CRect rect = lpDIS->rcItem;
// Setup the text format.
UINT nFormat = DT_LEFT | DT_SINGLELINE | DT_VCENTER;
if (GetStyle() & LBS_USETABSTOPS)
nFormat |= DT_EXPANDTABS;
// Calculate the rectangle size before drawing the text.
pDC->DrawText(sText, -1, &rect, nFormat | DT_CALCRECT);
pDC->DrawText(sText, -1, &rect, nFormat);
pDC->SetTextColor(crText);
pDC->SetBkMode(nBkMode);
} // DrawItem
//-------------------------------------------------------------------
//
void CColorListBox::MeasureItem(LPMEASUREITEMSTRUCT lpMIS)
//
// Return Value: None.
//
// Parameters : lpMIS - A long pointer to a
// MEASUREITEMSTRUCT structure.
//
// Remarks : Called by the framework when a list box with
// an owner-draw style is created.
//
{
// ### Is the default list box item height the same as
// the menu check height???
lpMIS->itemHeight = ::GetSystemMetrics(SM_CYMENUCHECK);
} // MeasureItem
//-------------------------------------------------------------------
//
int CColorListBox::AddString(LPCTSTR lpszItem)
//
// Return Value: The zero-based index to the string in the list box.
// The return value is LB_ERR if an error occurs; the
// return value is LB_ERRSPACE if insufficient space
// is available to store the new string.
//
// Parameters : lpszItem - Points to the null-terminated
// string that is to be added.
//
// Remarks : Call this member function to add a string to a list
// box. Provided because CListBox::AddString is NOT
// a virtual function.
//
{
return ((CListBox*)this)->AddString(lpszItem);
} // AddString
//-------------------------------------------------------------------
//
int CColorListBox::AddString(LPCTSTR lpszItem, COLORREF rgb)
//
// Return Value: The zero-based index to the string in the list box.
// The return value is LB_ERR if an error occurs; the
// return value is LB_ERRSPACE if insufficient space
// is available to store the new string.
//
// Parameters : lpszItem - Points to the null-terminated
// string that is to be added.
// rgb - Specifies the color to be associated with the item.
//
// Remarks : Call this member function to add a string to a list
// box with a custom color.
//
{
int nItem = AddString(lpszItem);
if (nItem >= 0)
SetItemData(nItem, rgb);
return nItem;
} // AddString
//-------------------------------------------------------------------
//
int CColorListBox::InsertString(int nIndex, LPCTSTR lpszItem)
//
// Return Value: The zero-based index of the position at which the
// string was inserted. The return value is LB_ERR if
// an error occurs; the return value is LB_ERRSPACE if
// insufficient space is available to store the new string.
//
// Parameters : nIndex - Specifies the zero-based index of the position
// to insert the string. If this parameter is –1, the string
// is added to the end of the list.
// lpszItem - Points to the null-terminated string that
// is to be inserted.
//
// Remarks : Inserts a string into the list box. Provided because
// CListBox::InsertString is NOT a virtual function.
//
{
return ((CListBox*)this)->InsertString(nIndex, lpszItem);
} // InsertString
//-------------------------------------------------------------------
//
int CColorListBox::InsertString(int nIndex, LPCTSTR lpszItem, COLORREF rgb)
//
// Return Value: The zero-based index of the position at which the
// string was inserted. The return value is LB_ERR if
// an error occurs; the return value is LB_ERRSPACE if
// insufficient space is available to store the new string.
//
// Parameters : nIndex - Specifies the zero-based index of the position
// to insert the string. If this parameter is –1, the string
// is added to the end of the list.
// lpszItem - Points to the null-terminated string that
// is to be inserted.
// rgb - Specifies the color to be associated with the item.
//
// Remarks : Inserts a colored string into the list box.
//
{
int nItem = ((CListBox*)this)->InsertString(nIndex,lpszItem);
if (nItem >= 0)
SetItemData(nItem, rgb);
return nItem;
} // InsertString
//-------------------------------------------------------------------
//
void CColorListBox::SetItemColor(int nIndex, COLORREF rgb)
//
// Return Value: None.
//
// Parameters : nIndex - Specifies the zero-based index of the item.
// rgb - Specifies the color to be associated with the item.
//
// Remarks : Sets the 32-bit value associated with the specified
// item in the list box.
//
{
SetItemData(nIndex, rgb);
RedrawWindow();
} // SetItemColor