infobar.cpp

c++系统开发实例精粹内附的80例源代码 环境:windows2000,c++6.0

//////////////////////////////////////////////////////////////////////
// FileFury
// Copyright (c) 2000 Tenebril Incorporated
// All rights reserved.
//
// This source code is governed by the Tenebril open source
// license (http://www.tenebril.com/developers/opensource/license.html)
//
// For more information on this and other open source applications,
// visit the Tenebril OpenSource page:
//       http://www.tenebril.com/developers/opensource
//
//////////////////////////////////////////////////////////////////////

// InfoBar.cpp : implementation file
//

#include "stdafx.h"
// For bitmap resources
#include "resource.h"
#include "InfoBar.h"

#include <afxpriv.h>

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

class CStaticCmdUI : public CCmdUI      
{
public: 
	virtual void SetText(LPCTSTR lpszText);
};

void CStaticCmdUI::SetText(LPCTSTR lpszText)
{
	CInfoBar* pInfoBar = (CInfoBar*)m_pOther;
	ASSERT(pInfoBar != NULL);

	pInfoBar->SetText(lpszText);
}


/////////////////////////////////////////////////////////////////////////////
// CInfoBar

CInfoBar::CInfoBar()
{
	m_cyBottomBorder = m_cyTopBorder = 4;	// l&r default to 6; t&b was 1
	m_caption = "default";					// must have some text for CalcFixedLayout
	m_cxAvailable = 0;
	m_crBackgroundColor = ::GetSysColor(COLOR_3DSHADOW); //Gray
	m_crTextColor = RGB(255,255,255); // White
}

CInfoBar::~CInfoBar()
{
}


BEGIN_MESSAGE_MAP(CInfoBar, CControlBar)
	//{{AFX_MSG_MAP(CInfoBar)
	ON_WM_CREATE()
	ON_WM_ERASEBKGND()
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
	ON_MESSAGE(WM_SIZEPARENT, OnSizeParent)
END_MESSAGE_MAP()


/////////////////////////////////////////////////////////////////////////////
// CInfoBar message handlers

int CInfoBar::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CControlBar::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// Comment out this next line for a different 3D effect
	ModifyStyleEx(0, WS_EX_CLIENTEDGE /*WS_EX_STATICEDGE*/);
//	ModifyStyle(0, WS_DLGFRAME);
//	ModifyStyle(0, WS_THICKFRAME);
	// Create a font twice as tall as the system status bar font
	NONCLIENTMETRICS metrics;
	metrics.cbSize = sizeof(metrics);
	SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, &metrics, 0);

	metrics.lfStatusFont.lfHeight *= 2;
	VERIFY(m_font.CreateFontIndirect(&metrics.lfStatusFont));
	return 0;
}

BOOL CInfoBar::OnEraseBkgnd(CDC* pDC) 
{
	CRect rect;
	GetClientRect(rect);
	pDC->FillSolidRect(rect, m_crBackgroundColor);

	return CControlBar::OnEraseBkgnd(pDC);
}

void CInfoBar::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	
	CRect r;
	GetClientRect(r);
	CalcInsideRect(r, TRUE);
	r.InflateRect(0, 2);

	CFont* pOldFont = dc.SelectObject(&m_font);

	dc.SetTextColor(m_crTextColor);
	dc.DrawText(m_caption, -1, r, DT_EDITCONTROL |
		DT_EXTERNALLEADING | DT_LEFT | DT_WORDBREAK | DT_END_ELLIPSIS);

	dc.DrawState(CPoint((r.right - m_sizeBitmap.cx), 
		         (r.bottom - m_sizeBitmap.cy)/2), 
				 m_sizeBitmap, &m_bm, DST_BITMAP);

	if (pOldFont != NULL)
		dc.SelectObject(pOldFont);
}

LRESULT CInfoBar::OnSizeParent(WPARAM, LPARAM lParam)
{
	AFX_SIZEPARENTPARAMS* lpLayout = (AFX_SIZEPARENTPARAMS*)lParam;

	// keep track of the available width for use by CalcFixedLayout later	
	m_cxAvailable = lpLayout->rect.right - lpLayout->rect.left;

	return CControlBar::OnSizeParent(0, lParam);
}

// Overridden virtual helper methods

void CInfoBar::OnUpdateCmdUI(CFrameWnd* pTarget, BOOL bDisableIfNoHndler)
{
	CStaticCmdUI state;
	state.m_pOther = this;
	state.m_nIndexMax = 1;		// there's only one thing to update
	state.m_nID = AFX_IDW_STATUS_BAR;

	// allow the statusbar itself to have update handlers
	if (CWnd::OnCmdMsg(state.m_nID, CN_UPDATE_COMMAND_UI, &state, NULL))
		return;

	// allow target (owner) to handle the remaining updates
	state.DoUpdate(pTarget, FALSE);
}

CSize CInfoBar::CalcFixedLayout(BOOL bStretch, BOOL bHorz)
{
	// Get border size (values will be negative)
	CRect rBorder; rBorder.SetRectEmpty();
	CalcInsideRect(rBorder, bHorz);

	// Based on the available width minus the border area,
	// calculate the necessary Y value to hold the text
	CRect rCalc(0, 0, m_cxAvailable - (-rBorder.Width()), 0);
	{
		CClientDC dc(this);
		CFont* pOldFont = dc.SelectObject(&m_font);

		dc.DrawText(m_caption, -1, rCalc, DT_CALCRECT | DT_EDITCONTROL |
			DT_EXTERNALLEADING | DT_LEFT | DT_WORDBREAK);

		if (pOldFont != NULL)
			dc.SelectObject(pOldFont);
	}

	// The Y value is the sum of the calculated height from DrawText,
	// plus the top and bottom border.
	CSize size;
	size.cx = 32767;
	size.cy = rCalc.Height();
	size.cy += (-rBorder.Height());

	return size;
}

void CInfoBar::SetText(LPCTSTR lpszNew)
{
	ASSERT(lpszNew && AfxIsValidString(lpszNew));

	if (m_caption != lpszNew)
	{
		m_caption = lpszNew;
		Invalidate();
	}
}


BOOL CInfoBar::SetBitmap(UINT nResID)
{
	BOOL bRet = FALSE;
	BITMAP	bitmap;	
	CSize bitSize;

	m_bm.DeleteObject();
	bRet = m_bm.LoadBitmap(nResID);
	if(bRet)
	{
		m_bm.GetBitmap(&bitmap);
		m_sizeBitmap.cx = bitmap.bmWidth;
		m_sizeBitmap.cy = bitmap.bmHeight;
	}
	Invalidate();
	return bRet;
}

BOOL CInfoBar::SetTextFont(LPCTSTR lpFontName)
{
	BOOL bRet;
	m_font.DeleteObject();
	
	NONCLIENTMETRICS metrics;
	metrics.cbSize = sizeof(metrics);
	SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, &metrics, 0);

	metrics.lfStatusFont.lfHeight *= 2;
	strcpy(metrics.lfStatusFont.lfFaceName, lpFontName);
	bRet = m_font.CreateFontIndirect(&metrics.lfStatusFont);
	Invalidate();
	return bRet;
}

void CInfoBar::SetBackgroundColor(COLORREF crNew)
{
	m_crBackgroundColor = crNew;
	Invalidate();
}

void CInfoBar::SetTextColor(COLORREF crNew)
{
	m_crTextColor = crNew;
	Invalidate();
}