ComboBoxEx2.cpp

//this file is part of eMule
//Copyright (C)2002-2008 Merkur ( strEmail.Format("%s@%s", "devteam", "emule-project.net") / http://www.emule-project.net )
//
//This program is free software; you can redistribute it and/or
//modify it under the terms of the GNU General Public License
//as published by the Free Software Foundation; either
//version 2 of the License, or (at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#include "stdafx.h"
#include "ComboBoxEx2.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif


///////////////////////////////////////////////////////////////////////////////
// CComboBoxEx2

IMPLEMENT_DYNAMIC(CComboBoxEx2, CComboBoxEx)

BEGIN_MESSAGE_MAP(CComboBoxEx2, CComboBoxEx)
END_MESSAGE_MAP()

CComboBoxEx2::CComboBoxEx2()
{
}

CComboBoxEx2::~CComboBoxEx2()
{
}

int CComboBoxEx2::AddItem(LPCTSTR pszText, int iImage)
{
	COMBOBOXEXITEM cbi = {0};
	cbi.mask = CBEIF_TEXT;
	cbi.iItem = -1;
	cbi.pszText = (LPTSTR)pszText;
	if (iImage != -1)
	{
		cbi.mask |= CBEIF_IMAGE | CBEIF_SELECTEDIMAGE;
		cbi.iImage = iImage;
		cbi.iSelectedImage = iImage;
	}
	return InsertItem(&cbi);
}

BOOL CComboBoxEx2::PreTranslateMessage(MSG* pMsg)
{
	// there seems to be no way that we get the WM_CHARTOITEM for this control
	ASSERT( pMsg->message != WM_CHARTOITEM );

	if (pMsg->message == WM_KEYDOWN)
	{
		UINT uChar = MapVirtualKey(pMsg->wParam, 2);
		if (uChar != 0)
		{
			// CComboBox::SelectString seems also not to work
			CComboBox* pctrlCB = GetComboBoxCtrl();
			if (pctrlCB != NULL)
			{
				int iCount = pctrlCB->GetCount();
				for (int i = 0; i < iCount; i++)
				{
					CString strItem;
					pctrlCB->GetLBText(i, strItem);
					if (strItem.IsEmpty())
						continue;

					//those casts are indeed all(!) needed to get that thing (at least!) running correctly for ANSI code pages,
					//if that will also work for MBCS code pages has to be tested..
					UINT uFirstChar      = (UINT)(_TUCHAR)strItem[0];
					UINT uFirstCharLower = (UINT)(_TUCHAR)_totlower((_TINT)(uFirstChar));
					UINT uTheChar        = (UINT)(_TUCHAR)_totlower((_TINT)((UINT)uChar));
					if (uFirstCharLower == uTheChar){
						SetCurSel(i);
						GetParent()->SendMessage(WM_COMMAND, MAKELONG((WORD)GetWindowLong(m_hWnd, GWL_ID), CBN_SELCHANGE), (LPARAM)m_hWnd);
						return TRUE;
					}
				}
			}
		}
	}
	return CComboBoxEx::PreTranslateMessage(pMsg);
}

// Win98: This function does not work under Win98 ?
BOOL CComboBoxEx2::SelectString(LPCTSTR pszText)
{
	// CComboBox::SelectString seems also not to work
	CComboBox* pctrlCB = GetComboBoxCtrl();
	if (pctrlCB != NULL)
	{
		int iCount = pctrlCB->GetCount();
		for (int i = 0; i < iCount; i++)
		{
			CString strItem;
			pctrlCB->GetLBText(i, strItem);
			if (strItem == pszText)
			{
				SetCurSel(i);
				GetParent()->SendMessage(WM_COMMAND, MAKELONG((WORD)GetWindowLong(m_hWnd, GWL_ID), CBN_SELCHANGE), (LPARAM)m_hWnd);
				return TRUE;
			}
		}
	}
	return FALSE;
}

BOOL CComboBoxEx2::SelectItemDataStringA(LPCSTR pszText)
{
	CComboBox* pctrlCB = GetComboBoxCtrl();
	if (pctrlCB != NULL)
	{
		int iCount = pctrlCB->GetCount();
		for (int i = 0; i < iCount; i++)
		{
			void* pvItemData = GetItemDataPtr(i);
			if (pvItemData && strcmp((LPCSTR)pvItemData, pszText) == 0)
			{
				SetCurSel(i);
				GetParent()->SendMessage(WM_COMMAND, MAKELONG((WORD)GetWindowLong(m_hWnd, GWL_ID), CBN_SELCHANGE), (LPARAM)m_hWnd);
				return TRUE;
			}
		}
	}
	return FALSE;
}

void UpdateHorzExtent(CComboBox &rctlComboBox, int iIconWidth)
{
	int iItemCount = rctlComboBox.GetCount();
	if (iItemCount > 0)
	{
		CDC *pDC = rctlComboBox.GetDC();
		if (pDC != NULL)
		{
			// *** To get *ACCURATE* results from 'GetOutputTextExtent' one *MUST*
			// *** explicitly set the font!
			CFont *pOldFont = pDC->SelectObject(rctlComboBox.GetFont());

			CString strItem;
			int iMaxWidth = 0;
			for (int i = 0; i < iItemCount; i++)
			{
				rctlComboBox.GetLBText(i, strItem);
				int iItemWidth = pDC->GetOutputTextExtent(strItem, strItem.GetLength()).cx;
				if (iItemWidth > iMaxWidth)
					iMaxWidth = iItemWidth;
			}
			
			pDC->SelectObject(pOldFont);
			rctlComboBox.ReleaseDC(pDC);

			// Depending on the string (lot of "M" or lot of "i") sometime the
			// width is just a few pixels too small!
			iMaxWidth += 4;
			if (iIconWidth)
				iMaxWidth += 2 + iIconWidth + 2;
			rctlComboBox.SetHorizontalExtent(iMaxWidth);
			if (rctlComboBox.GetDroppedWidth() < iMaxWidth)
				rctlComboBox.SetDroppedWidth(iMaxWidth);
		}
	}
	else
		rctlComboBox.SetHorizontalExtent(0);
}

HWND GetComboBoxEditCtrl(CComboBox& cb)
{
	CWnd* pWnd = cb.GetWindow(GW_CHILD);
	while (pWnd)
	{
		CHAR szClassName[MAX_PATH];
		if (::GetClassNameA(*pWnd, szClassName, ARRSIZE(szClassName)))
		{
			if (__ascii_stricmp(szClassName, "EDIT") == 0)
				return pWnd->m_hWnd;
		}
		pWnd = pWnd->GetNextWindow();
	}
	return NULL;
}