splitframe.cpp

这是MFC经典问答书的光盘内容

// SplitFrame.cpp : implementation file
//

#include "stdafx.h"
#include "ResizeSplitter.h"
#include "SplitFrame.h"

#include "DrawDoc.h"
#include "DrawView.h"
#include "DrawFormView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CSplitFrame

IMPLEMENT_DYNCREATE(CSplitFrame, CMDIChildWnd)

CSplitFrame::CSplitFrame()
{
}

CSplitFrame::~CSplitFrame()
{
}

BOOL CSplitFrame::OnCreateClient(LPCREATESTRUCT /*lpcs*/, CCreateContext* pContext)
{
	CRect rect;
	GetClientRect( &rect );
	CSize size = rect.Size();
	size.cx /= 2;		// Initial column size
	size.cy /= 2;		// Initial row size

	// 1 - Create first static splitter
	if( !m_wndSplitter1.CreateStatic( this, 1, 2 ) )	// 1 row, 2 cols
	{
		TRACE0( "Failed to create first static splitter\n" );
		return FALSE;
	}

	// 2 - Create left column view
	if( !m_wndSplitter1.CreateView( 0, 0,				// row 0, col 0
							RUNTIME_CLASS( CDrawFormView ), 
							size, pContext ) )
	{
		TRACE0( "Failed to create left view\n" );
		return FALSE;
	}

	// 3 - Create nested static splitter 
	if( !m_wndSplitter2.CreateStatic( &m_wndSplitter1, 2, 1,	// 2 rows, 1 col
							 WS_CHILD | WS_VISIBLE,
							 m_wndSplitter1.IdFromRowCol( 0, 1 ) ) )
	{
		TRACE0( "Failed to create nested static splitter\n" );
		return FALSE;
	}

	// 4 - Create top-right view
	if( !m_wndSplitter2.CreateView( 0, 0,			// row 0, col 0
							RUNTIME_CLASS( CDrawView ), 
							size, pContext ) )
	{
		TRACE0( "Failed to create top-right view\n" );
		return FALSE;
	}

	// 5 - Create bottom-right view
	if( !m_wndSplitter2.CreateView( 1, 0,			// row 1, col 0
							RUNTIME_CLASS( CDrawView ), 
							size, pContext ) )
	{
		TRACE0( "Failed to create bottom-right view\n" );
		return FALSE;
	}

	return TRUE;
}


BEGIN_MESSAGE_MAP(CSplitFrame, CMDIChildWnd)
	//{{AFX_MSG_MAP(CSplitFrame)
	ON_WM_SIZE()
	ON_COMMAND(ID_RESIZE_SPLITTERS, OnResizeSplitters)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSplitFrame message handlers

void CSplitFrame::OnSize(UINT nType, int cx, int cy) 
{
	CMDIChildWnd::OnSize(nType, cx, cy);
	
	OnResizeSplitters();
}


void CSplitFrame::OnResizeSplitters() 
{
	// Sanity check -- avoids exception because we receive
	// the first WM_SIZE before the splitter windows are created
	HWND hWnd1 = m_wndSplitter1.GetSafeHwnd();
	HWND hWnd2 = m_wndSplitter2.GetSafeHwnd();

	if(	hWnd1 == NULL || !::IsWindow( hWnd1 ) ||
		hWnd2 == NULL || !::IsWindow( hWnd2 ) )
	{
		return;
	}
		
	// 1 - Get the current client size for our entire frame window
	CRect rect;
	GetClientRect( &rect );

	// 2 - Calculate the ideal row and column sizes
	CSize size = rect.Size();
	size.cx /= 2;		// Ideal column size
	size.cy /= 2;		// Ideal row size

	// 3 - Resize each column of the first splitter
	int cxCur, cxMin;
	m_wndSplitter1.GetColumnInfo( 0, cxCur, cxMin );
	m_wndSplitter1.SetColumnInfo( 0, size.cx, cxMin );

	m_wndSplitter1.GetColumnInfo( 1, cxCur, cxMin );
	m_wndSplitter1.SetColumnInfo( 1, size.cx, cxMin );

	// 4 - Resize each row of the second splitter
	int cyCur, cyMin;
	m_wndSplitter2.GetRowInfo( 0, cyCur, cyMin );
	m_wndSplitter2.SetRowInfo( 0, size.cy, cyMin );

	m_wndSplitter2.GetRowInfo( 1, cyCur, cyMin );
	m_wndSplitter2.SetRowInfo( 1, size.cy, cyMin );

	// 5 - Ask each splitter to recalculate its layout
	m_wndSplitter1.RecalcLayout();
	m_wndSplitter2.RecalcLayout();
}