ex9dlg.cpp

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// Ex9Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "Ex9.h"
#include "Ex9Dlg.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()

/////////////////////////////////////////////////////////////////////////////
// CEx9Dlg dialog

CEx9Dlg::CEx9Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CEx9Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CEx9Dlg)
	m_iCurPos = 0;
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CEx9Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CEx9Dlg)
	DDX_Text(pDX, IDC_CURPOS, m_iCurPos);
	DDV_MinMaxInt(pDX, m_iCurPos, -100, 100);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEx9Dlg, CDialog)
	//{{AFX_MSG_MAP(CEx9Dlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_HSCROLL()
	ON_EN_CHANGE(IDC_CURPOS, OnChangeCurPos)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEx9Dlg message handlers

BOOL CEx9Dlg::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
	CScrollBar *pScroll=(CScrollBar*)GetDlgItem(IDC_SCROLL);
	pScroll->SetScrollRange(-100, 100);
	pScroll->SetScrollPos(0);
	SetDlgItemInt(IDC_CURPOS, 0);

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CEx9Dlg::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 CEx9Dlg::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 CEx9Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CEx9Dlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	// TODO: Add your message handler code here and/or call default
	// 获得原有的滚动条位置
	int iPos=pScrollBar->GetScrollPos();
	
	// 根据不同的拖动方式设置新的滚动条位置
	switch (nSBCode){
	// 向右滚动一行
	case SB_LINERIGHT:
		iPos+=1;
		break;
	// 向左滚动一行
	case SB_LINELEFT:
		iPos-=1;
		break;
	// 向右滚动一页
	case SB_PAGERIGHT:
		iPos+=10;
		break;
	// 向左滚动一页
	case SB_PAGELEFT:
		iPos-=10;
		break;
	// 直接拖动滚动块
	case SB_THUMBTRACK:
		iPos=nPos;
		break;
	default:
		break;
	}
	// 滚动条的最大位置不超过 100, 最小位置不小于 -100
	if (iPos<-100) iPos=-100;
	if (iPos>100) iPos=100;
	// 必须手动的更新滚动条的当前位置
	pScrollBar->SetScrollPos(iPos);
	// 在编辑框中显示滚动条的当前位置
	SetDlgItemInt(IDC_CURPOS, iPos);
	CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}



void CEx9Dlg::OnChangeCurPos() 
{
	// TODO: If this is a RICHEDIT control, the control will not
	// send this notification unless you override the CDialog::OnInitDialog()
	// function and call CRichEditCtrl().SetEventMask()
	// with the ENM_CHANGE flag ORed into the mask.
	
	// TODO: Add your control notification handler code here
	CString str;
	GetDlgItemText(IDC_CURPOS, str);
	str.TrimLeft();
	str.TrimRight();
	int iPos=0;

	if (str!="-" && str!=""){
		if (!UpdateData()){
			return;
		}
		iPos=m_iCurPos;
	}

	CScrollBar *pScroll=(CScrollBar*)GetDlgItem(IDC_SCROLL);
	pScroll->SetScrollPos(iPos);
}