scrolldlg.cpp

MFC程序开发参考大全 【明日科技】宋坤 刘锐宁 李伟明 【丛 书 名】 软件工程师典藏 【出 版 社】 人民邮电出版社 本书详细介绍了MFC框架中所有常用类及控件的应用

// ScrollDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Scroll.h"
#include "ScrollDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CScrollDlg dialog

CScrollDlg::CScrollDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CScrollDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CScrollDlg)
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CScrollDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CScrollDlg)
	DDX_Control(pDX, IDC_IMAGE, m_Image);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CScrollDlg, CDialog)
	//{{AFX_MSG_MAP(CScrollDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_HSCROLL()
	ON_WM_VSCROLL()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CScrollDlg message handlers

BOOL CScrollDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	HBITMAP m_hBitmap;
	m_hBitmap=::LoadBitmap(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDB_BITMAP1));
	m_Image.SetBitmap(m_hBitmap);
	BITMAP bmp;
	GetObject(m_hBitmap,sizeof(bmp),&bmp);
	CRect rect;
	GetClientRect(rect);	
	int xpos = GetScrollPos(SB_HORZ);
	if (xpos !=0)
		ScrollWindow(xpos,0); //恢复窗口的水平滚动区域
	int ypos = GetScrollPos(SB_VERT);
	if (ypos !=0)
	ScrollWindow(0,ypos); //恢复窗口的垂直滚动区域
		
	SCROLLINFO vinfo;	
	vinfo.cbSize = sizeof(vinfo);
	vinfo.fMask = SIF_ALL;
	vinfo.nPage = bmp.bmHeight/10;
	vinfo.nMax= bmp.bmHeight-rect.Height()+bmp.bmHeight/10;
	vinfo.nMin = 0;
	vinfo.nTrackPos = 0;
	vinfo.nPos = 0;	
	//设置垂直滚动条信息
	SetScrollInfo(SB_VERT,&vinfo);

	vinfo.fMask = SIF_ALL;
	vinfo.nPage = bmp.bmWidth/10;
	vinfo.nMax= bmp.bmWidth-rect.Width()+bmp.bmWidth/10;
	vinfo.nMin = 0;
	vinfo.nPos  = 0;
	vinfo.nTrackPos = 0;
	vinfo.cbSize = sizeof(vinfo);
	//设置水平滚动条信息
	SetScrollInfo(SB_HORZ,&vinfo);
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CScrollDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CScrollDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CScrollDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CScrollDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	// TODO: Add your message handler code here and/or call default
	int pos,min,max,thumbwidth;

	SCROLLINFO vinfo;
	GetScrollInfo(SB_HORZ,&vinfo);
	
	pos = vinfo.nPos;
	min = vinfo.nMin;
	max = vinfo.nMax;
	thumbwidth = vinfo.nPage;

	switch (nSBCode)
	{
		case SB_THUMBTRACK: //拖动滚动块
			ScrollWindow(-(nPos-pos),0);
			SetScrollPos(SB_HORZ,nPos);
			break;
		case SB_LINELEFT : //单击左箭头
			if (pos != 0)
			{
				ScrollWindow(1,0);
				SetScrollPos(SB_HORZ,pos-1);
			}
			break;
		case SB_LINERIGHT: //单击右箭头
			if (pos+thumbwidth <= max)
			{
				SetScrollPos(SB_HORZ,pos+1);
				ScrollWindow(-1,0);	
			}
			break;
		case SB_PAGELEFT: //在滚动块的左方空白滚动区域单击
			if (pos >= thumbwidth)
			{
				ScrollWindow(thumbwidth,0);
				SetScrollPos(SB_HORZ,pos-thumbwidth);
			}
			else
			{
				ScrollWindow(pos,0);
				SetScrollPos(SB_HORZ,0);
			}
			break;
		case SB_PAGERIGHT: //在滚动块的右方空白滚动区域单击
			if (pos+thumbwidth <= max-thumbwidth)
			{
				ScrollWindow(-thumbwidth,0);
				SetScrollPos(SB_HORZ,pos+thumbwidth);
			}
			else
			{
				ScrollWindow(-(max-(pos+thumbwidth)),0);
				SetScrollPos(SB_HORZ,max-thumbwidth);
			}
			break;
	}
	CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}

void CScrollDlg::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	// TODO: Add your message handler code here and/or call default
	int pos,min,max,thumbwidth;

	SCROLLINFO vinfo;
	GetScrollInfo(SB_VERT,&vinfo);
	
	pos = vinfo.nPos;
	min = vinfo.nMin;
	max = vinfo.nMax;
	thumbwidth = vinfo.nPage;

	switch (nSBCode)
	{
		case SB_THUMBTRACK:
			ScrollWindow(0,-(nPos-pos));
			SetScrollPos(SB_VERT,nPos);	
			break;
		case SB_LINELEFT:
			SetScrollPos(SB_VERT,pos-1);
			if (pos != 0)
				ScrollWindow(0,1);
			break;
		case SB_LINERIGHT:
			SetScrollPos(SB_VERT,pos+1);
			if (pos+thumbwidth < max)
				ScrollWindow(0,-1);	
			break;
		case SB_PAGELEFT: //在滚动块的上方空白滚动区域单击
			if (pos >= thumbwidth)
			{
				ScrollWindow(0,thumbwidth);
				SetScrollPos(SB_VERT,pos-thumbwidth);
			}
			else
			{
				ScrollWindow(0,pos);
				SetScrollPos(SB_VERT,0);
			}
			break;
		case SB_PAGERIGHT: //在滚动块的下方空白滚动区域单击
			if (pos+thumbwidth <= max-thumbwidth)
			{
				ScrollWindow(0,-thumbwidth);
				SetScrollPos(SB_VERT,pos+thumbwidth);
			}
			else
			{
				ScrollWindow(0,-(max-(pos+thumbwidth)));
				SetScrollPos(SB_VERT,max-thumbwidth);
			}
			break;
	}
	CDialog::OnVScroll(nSBCode, nPos, pScrollBar);
}