mainfrm.cpp

在MFC应用程序中根据自己的选择显示一个JPG图形文件

////////////////////////////////////////////////////////////////
// MSDN Magazine -- October 2001
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual C++ 6.0 for Windows 98 and probably Windows 2000 too.
// Set tabsize = 3 in your editor.
//
#include "StdAfx.h"
#include "MainFrm.h"
#include "View.h"
#include "resource.h"

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

////////////////////////////////////////////////////////////////
// CMainFrame
//
IMPLEMENT_DYNCREATE(CMainFrame, CFrameWnd)

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
	ON_WM_CREATE()
	ON_NOTIFY(TBN_DROPDOWN, AFX_IDW_TOOLBAR, OnToolbarDropDown)
END_MESSAGE_MAP()

static UINT indicators[] = {
	ID_SEPARATOR,           // status line indicator
	ID_INDICATOR_CAPS,
	ID_INDICATOR_NUM,
	ID_INDICATOR_SCRL,
};

CMainFrame::CMainFrame()
{
}

CMainFrame::~CMainFrame()
{
}

////////////////
// Override flicker-free drawing with no CS_VREDRAW and CS_HREDRAW. This has
// nothing to do with coolbars, but I it's a good thing to do.
//
BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
   cs.lpszClass = AfxRegisterWndClass(
      0,											 // no redraw
      NULL,                             // no cursor (use default)
      NULL,                             // no background brush
      AfxGetApp()->LoadIcon(IDR_MAINFRAME)); // app icon
   ASSERT(cs.lpszClass);
   return CFrameWnd::PreCreateWindow(cs);
}

//////////////////
// Create handler creates control bars
//
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	VERIFY(m_wndStatusBar.Create(this));
	VERIFY(m_wndStatusBar.SetIndicators(indicators,
		  sizeof(indicators)/sizeof(UINT)));

	VERIFY(m_wndToolBar.Create(this));
	VERIFY(m_wndToolBar.LoadToolBar(IDR_MAINFRAME));
	m_wndToolBar.ModifyStyle(0, TBSTYLE_FLAT);

	// TODO: Remove this if you don't want tool tips or a resizeable toolbar
	m_wndToolBar.SetBarStyle(m_wndToolBar.GetBarStyle() |
		CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC);

#ifndef TB_SETEXTENDEDSTYLE
#define TB_SETEXTENDEDSTYLE     (WM_USER + 84)  // For TBSTYLE_EX_*
#define TBSTYLE_EX_DRAWDDARROWS 0x00000001
#endif

	CToolBar& tb = m_wndToolBar;
	tb.SendMessage(TB_SETEXTENDEDSTYLE, 0, TBSTYLE_EX_DRAWDDARROWS);

	// change button style to dropdown
	int iButton = tb.SendMessage(TB_COMMANDTOINDEX, ID_FILE_OPEN);
	DWORD dwStyle = tb.GetButtonStyle(iButton);
	dwStyle |= TBSTYLE_DROPDOWN;
	tb.SetButtonStyle(iButton, dwStyle);

	VERIFY(CFrameWnd::OnCreate(lpCreateStruct) == 0);

	return 0;
}

//////////////////
// Handle TBN_DROPDOWN
// Default is to display the specified menu at the right place.
// You can override to generate dynamic menus
//
// Args:
//		- NMTOOLBAR struct from TBN_DROPDOWN
//		- command id of button
//		- point to display menu at
//
void CMainFrame::OnToolbarDropDown(NMHDR *pnmh, LRESULT *plr)
{
	NMTOOLBAR* pnmtb = (NMTOOLBAR*)pnmh;

	// load and display popup menu
	CMenu menu;
	menu.LoadMenu(IDR_FILEDROPDOWN);
	CMenu* pPopup = menu.GetSubMenu(0);
	ASSERT(pPopup);

	CRect rc;
	m_wndToolBar.SendMessage(TB_GETRECT, pnmtb->iItem, (LPARAM)&rc);
	m_wndToolBar.ClientToScreen(&rc);

	pPopup->TrackPopupMenu(TPM_LEFTALIGN|TPM_LEFTBUTTON|TPM_VERTICAL,
		rc.left, rc.bottom, this, &rc);
}