formatbar.cpp

一个很好的富文本编辑程序,类似于windows中的写字板但并不同

/////////////////////////////////////////////////////////////////////////////
// FormatBar.cpp : implementation file
//

#include "stdafx.h"
#include "RichEdit.h"
#include "FormatBar.h"

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

/////////////////////////////////////////////////////////////////////////////
// CFormatBar

// Declare const array of font sizes
const static int nFontSizes[] = 
	{8, 9, 10, 11, 12, 14, 16, 18, 20, 22, 24, 26, 28, 36, 48, 72};


CFormatBar::CFormatBar(UINT nID )
{
	nToolbarID = nID;
}

CFormatBar::~CFormatBar()
{
}


BEGIN_MESSAGE_MAP(CFormatBar, CSA3DToolBar)
	//{{AFX_MSG_MAP(CFormatBar)
	ON_WM_CREATE()
	//}}AFX_MSG_MAP
	ON_CBN_SELENDOK(IDC_FONTNAME, OnSelectFontName)
	ON_CBN_SELENDOK(IDC_FONTSIZE, OnSelectFontSize)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CFormatBar message handlers

int CFormatBar::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CToolBar::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// Load the toolbar
	if( !LoadToolBar( nToolbarID ) )
		return -1;


	// Get the average char width
	CClientDC dc(this);

	// Determine the size required by the font comboboxes
	// We will use the DEFAULT_GUI_FONT
	HGDIOBJ hFont = GetStockObject( DEFAULT_GUI_FONT );
	CFont font;
	font.Attach( hFont );
	dc.SelectObject( font );

	TEXTMETRIC tm;
	dc.GetTextMetrics( &tm );
	int cxChar = tm.tmAveCharWidth;
	int cyChar = tm.tmHeight + tm.tmExternalLeading;


	// Create the Font Name combo
	CRect rect; 
	GetItemRect( CommandToIndex(IDC_FONTNAME), &rect );
	rect.right = rect.left + (LF_FACESIZE+2)*cxChar;
	rect.bottom = rect.top + 16*cyChar;

	SetButtonInfo( CommandToIndex(IDC_FONTNAME), IDC_FONTNAME, 
				TBBS_SEPARATOR, rect.Width() );

	UINT nCreateStyle = WS_TABSTOP|WS_VISIBLE|WS_VSCROLL;
	if (!m_cmbFontName.Create(nCreateStyle|CBS_DROPDOWNLIST|CBS_SORT, 
		rect, this, IDC_FONTNAME))
	{
		TRACE0("Failed to create Font Name combo-box\n");
		return -1;
	}


	// Create Font Size combo
	GetItemRect( CommandToIndex(IDC_FONTSIZE), &rect );
	rect.right = rect.left + 8*cxChar;
	rect.bottom = rect.top + 16*cyChar;

	SetButtonInfo( CommandToIndex(IDC_FONTSIZE), IDC_FONTSIZE, 
				TBBS_SEPARATOR, rect.Width() );

	if (!m_cmbFontSize.Create(nCreateStyle|CBS_DROPDOWN|WS_HSCROLL, 
		rect, this, IDC_FONTSIZE))
	{
		TRACE0("Failed to create Font Size combo-box\n");
		return -1;
	}
	m_cmbFontSize.LimitText(4);


	// Set the font for the combo boxes to DEFAULT_GUI_FONT
	m_cmbFontName.SetFont(&font);
	m_cmbFontSize.SetFont(&font);

	// Fill the Font names in the Font Name combo
	::EnumFontFamilies( dc.m_hDC, NULL, (FONTENUMPROC)EnumFontFamProc, 
				(LPARAM) this );

	// Fill the Font Size combo
	CString sSize;
	int nSizeCount = sizeof(nFontSizes) / sizeof(nFontSizes[0]);
	for( int i=0; i < nSizeCount; i++ )
	{
		sSize.Format("%d", nFontSizes[i] );
		m_cmbFontSize.AddString( sSize );
	}

	return 0;
}

int CALLBACK CFormatBar::EnumFontFamProc(ENUMLOGFONT *lpelf, NEWTEXTMETRIC *lpntm,
					int nFontType, LPARAM lParam)
{
	CFormatBar* pWnd = (CFormatBar*)lParam;

	// Add the font name to the combo
	pWnd->m_cmbFontName.AddString(lpelf->elfLogFont.lfFaceName);

	return 1;		// 1 to continue enumeration
}

void CFormatBar::OnSelectFontName()
{
	TCHAR szFontName[LF_FACESIZE];
	int nIndex = m_cmbFontName.GetCurSel();
	m_cmbFontName.GetLBText( nIndex, szFontName );

	// If font name is empty - return
	if( szFontName[0] == 0 )
		return;

	CHARNMHDR fh;
	CHARFORMAT& cf = fh.cf;
	fh.hwndFrom = m_hWnd;
	fh.idFrom = GetDlgCtrlID();
	fh.code = FN_SETFORMAT;
	cf.dwMask = CFM_FACE;

	_tcsncpy(cf.szFaceName, szFontName, LF_FACESIZE);	//strncpy

	GetOwner()->SendMessage(WM_NOTIFY, fh.idFrom, (LPARAM)&fh);
}

void CFormatBar::OnSelectFontSize()
{
	TCHAR szSize[5];
	int index = m_cmbFontSize.GetCurSel();
	if( index != CB_ERR )
		m_cmbFontSize.GetLBText(index, szSize );
	else
		m_cmbFontSize.GetWindowText( szSize, 5 );

	// Get size in Twips
	int nSize = _ttoi( szSize ) * 20;			// atoi for tchar

	if( !nSize )
		return;

	CHARNMHDR fh;
	CHARFORMAT& cf = fh.cf;
	fh.hwndFrom = m_hWnd;
	fh.idFrom = GetDlgCtrlID();
	fh.code = FN_SETFORMAT;

	cf.dwMask = CFM_SIZE;
	cf.yHeight = nSize;

	GetOwner()->SendMessage(WM_NOTIFY, fh.idFrom, (LPARAM)&fh);
}

void CFormatBar::OnUpdateCmdUI(CFrameWnd* pTarget, BOOL bDisableIfNoHndler)
{
	// Take care of the regular toolbar buttons
	CToolBar::OnUpdateCmdUI( pTarget, bDisableIfNoHndler);

	// Don't update the combo boxes if user changing font attribute
	CWnd *pWnd = GetFocus();
	if( pWnd == &m_cmbFontName || m_cmbFontSize.IsChild(pWnd) )
		return;

	// get the current font from the view and update
	CHARNMHDR fh;
	CHARFORMAT& cf = fh.cf;
	fh.hwndFrom = m_hWnd;
	fh.idFrom = GetDlgCtrlID();
	fh.code = FN_GETFORMAT;

	CWnd *pOwnerWnd = GetOwner();
	if( !GetOwner()->SendMessage(WM_NOTIFY, fh.idFrom, (LPARAM)&fh) )
	{
		TRACE0("The Rich Edit View/Control has to handle the FN_GETFORMAT\n"
			"notification for the Format Bar to work properly\n");
		return;
	}

	// Update the font only if the selection font is different
	TCHAR szName[LF_FACESIZE];
	m_cmbFontName.GetWindowText( szName, LF_FACESIZE );

	// the selection must be same font and charset to display correctly
	if ((cf.dwMask & (CFM_FACE|CFM_CHARSET)) != (CFM_FACE|CFM_CHARSET))
		m_cmbFontName.SetCurSel( -1 );
	else if( ::_tcscmp( szName, cf.szFaceName ) != 0 )
	{
		if( m_cmbFontName.SelectString( -1, cf.szFaceName ) == CB_ERR )
			m_cmbFontName.SetCurSel( -1 );
	}


	// Update the font size
	TCHAR szSize[5];
	m_cmbFontSize.GetWindowText( szSize, 5 );
	int nSize = _ttoi( szSize );				// atoi for tchar

	// Update the font size only if selection is different 
	int nSelSize = (cf.dwMask & CFM_SIZE) ? cf.yHeight/20 : 0;
	if( nSize != nSelSize )
	{
		if(cf.dwMask & CFM_SIZE)
		{
			CString strSize;
			strSize.Format("%d", nSelSize );
			m_cmbFontSize.SetWindowText( strSize );
		}
		else
			m_cmbFontSize.SetCurSel(-1);
	}
}

BOOL CFormatBar::PreTranslateMessage(MSG* pMsg) 
{
	if (pMsg->message == WM_KEYDOWN)
	{
		NMHDR nm;
		nm.hwndFrom = m_hWnd;
		nm.idFrom = GetDlgCtrlID();
		nm.code = NM_RETURN;
		switch (pMsg->wParam)
		{
		case VK_RETURN:
			// Send change notification
			if( m_cmbFontName.IsChild(GetFocus()) )
				OnSelectFontName();
			else if( m_cmbFontSize.IsChild(GetFocus()) )
				OnSelectFontSize();
			//Fall through
		case VK_ESCAPE:
			GetOwner()->SendMessage(WM_NOTIFY, nm.idFrom, (LPARAM)&nm);
			return TRUE;
		}
	}
	
	return CToolBar::PreTranslateMessage(pMsg);
}