// CHelpDialog.cpp: 实现文件
//

#include "pch.h"
#include "Lianliankan.h"
#include "CHelpDialog.h"
#include "afxdialogex.h"


// CHelpDialog 对话框

IMPLEMENT_DYNAMIC(CHelpDialog, CDialogEx)

CHelpDialog::CHelpDialog(CWnd* pParent /*=nullptr*/)
	: CDialogEx(IDD_HELP_DIALOG, pParent)
{
    m_nXPos = 0;
    m_nYPos = 0;
}

CHelpDialog::~CHelpDialog()
{
}

void CHelpDialog::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
}


BEGIN_MESSAGE_MAP(CHelpDialog, CDialogEx)
	ON_WM_PAINT()
	ON_WM_VSCROLL()
END_MESSAGE_MAP()


// CHelpDialog 消息处理程序


void CHelpDialog::OnPaint()
{
	CPaintDC dc(this); // device context for painting
					   // TODO: 在此处添加消息处理程序代码
					   // 不为绘图消息调用 CDialogEx::OnPaint()

	/*dc.BitBlt(0, 0, 3840, 2160, &m_dcMem, 700, 200, SRCCOPY);*/


    //CPaintDC dc(this); // device context for painting

// 用指定的坐标设置设备环境的窗口原点
    SetWindowOrgEx(dc.m_hDC, m_nXPos, m_nYPos, NULL);

    // 创建一块和窗口滑动区域一样大的内存DC，这样才不会出现窗口图形叠加的问题
    CRect rc(0, 0, 0, 0);
    SCROLLINFO si = { sizeof(SCROLLINFO) };
    si.fMask = SIF_RANGE;
    GetScrollInfo(SB_VERT, &si);
    rc.bottom = si.nMax;
    GetScrollInfo(SB_HORZ, &si);
    rc.right = si.nMax;


    CDC memDC;
    memDC.CreateCompatibleDC(&dc);
    CBitmap memBitmap;
    memBitmap.CreateCompatibleBitmap(&dc, rc.Width(), rc.Height());
    CBitmap* pOldBmp = memDC.SelectObject(&memBitmap);
    memDC.FillSolidRect(&rc, RGB(0, 0, 0));
    CFont font;
    font.CreateFont(20, 0, 0, 0, FW_NORMAL, FALSE, FALSE, 0, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,
        DEFAULT_PITCH | FF_SWISS, _T("Arial"));
    memDC.SetBkMode(TRANSPARENT);
    memDC.SetTextColor(RGB(255, 255, 255));
    CFont* pOldFont = memDC.SelectObject(&font);
    int nH = 40;
    CRect rcText(0, rc.top, rc.right, rc.top + nH);
    CString str;
    CTime time;
    for (int i = 0; i < 200; i++)
    {
        ::OffsetRect(&rcText, 0, nH);
        if (rcText.bottom > rc.bottom)
        {
            break;
        }
        time = CTime::GetCurrentTime();
        str.Format(_T("当前行:[%d] "), i);
        str += time.Format(_T("%Y年%m%d日 %H时%M分%S秒 <%c>"));
        str += _T(" -------------------- ");
        str += str;
        str += str;
        memDC.DrawText(str, rcText, DT_LEFT);
    }

    dc.BitBlt(0, 0, 1920, 1080, &m_dcMem, 0, 0, SRCCOPY);

    memDC.SelectObject(pOldFont);
    memDC.SelectObject(pOldBmp);
    memDC.DeleteDC();
    memBitmap.DeleteObject();


	CDialogEx::OnPaint();
}


BOOL CHelpDialog::OnInitDialog()
{
	CDialogEx::OnInitDialog();

	// TODO:  在此添加额外的初始化
	CBitmap bmpMain;
	bmpMain.LoadBitmapW(IDB_HELP);

	//创建兼容DC
	CClientDC dc(this);
	m_dcMem.CreateCompatibleDC(&dc);

	m_dcMem.SelectObject(&bmpMain);
	return TRUE;  // return TRUE unless you set the focus to a control
				  // 异常: OCX 属性页应返回 FALSE
}


void CHelpDialog::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值

    //SCROLLINFO scrollinfo;
    //GetScrollInfo(SB_VERT, &scrollinfo, SIF_ALL);
    //int unit = 3;
    //switch (nSBCode)
    //{
    //case SB_LINEUP:          //Scroll one line up
    //    scrollinfo.nPos -= 1;
    //    if (scrollinfo.nPos < scrollinfo.nMin)
    //    {
    //        scrollinfo.nPos = scrollinfo.nMin;
    //        break;
    //    }
    //    SetScrollInfo(SB_VERT, &scrollinfo, SIF_ALL);
    //    ScrollWindow(0, unit);
    //    
    //    break;
    //case SB_LINEDOWN:           //Scroll one line down
    //    scrollinfo.nPos += 1;
    //    if (scrollinfo.nPos + scrollinfo.nPage > scrollinfo.nMax)  //此处一定要注意加上滑块的长度，再作判断
    //    {
    //        scrollinfo.nPos = scrollinfo.nMax;
    //        break;
    //    }
    //    SetScrollInfo(SB_VERT, &scrollinfo, SIF_ALL);
    //    ScrollWindow(0, -unit);
    //    
    //    break;
    //case SB_PAGEUP:            //Scroll one page up.
    //    scrollinfo.nPos -= 5;
    //    if (scrollinfo.nPos <= scrollinfo.nMin)
    //    {
    //        scrollinfo.nPos = scrollinfo.nMin;
    //        break;
    //    }
    //    SetScrollInfo(SB_VERT, &scrollinfo, SIF_ALL);
    //    ScrollWindow(0, unit * 5);
    //    
    //    break;
    //case SB_PAGEDOWN:        //Scroll one page down        
    //    scrollinfo.nPos += 5;
    //    if (scrollinfo.nPos + scrollinfo.nPage >= scrollinfo.nMax)  //此处一定要注意加上滑块的长度，再作判断
    //    {
    //        scrollinfo.nPos = scrollinfo.nMax;
    //        break;
    //    }
    //    SetScrollInfo(SB_VERT, &scrollinfo, SIF_ALL);
    //    ScrollWindow(0, -unit * 5);
    //    
    //    break;
    //case SB_ENDSCROLL:      //End scroll     
    //    break;
    //case SB_THUMBPOSITION:  //Scroll to the absolute position. The current position is provided in nPos
    //    break;
    //case SB_THUMBTRACK:                  //Drag scroll box to specified position. The current position is provided in nPos
    //    ScrollWindow(0, (scrollinfo.nPos - nPos) * unit);
    //    scrollinfo.nPos = nPos;
    //    SetScrollInfo(SB_VERT, &scrollinfo, SIF_ALL);
    //    break;
    //}

    SCROLLINFO si = { sizeof(si) };
    si.fMask = SIF_ALL;
    GetScrollInfo(SB_VERT, &si);

    int nPrevPos = si.nPos;
    switch (nSBCode)
    {
    case SB_TOP:
        si.nPos = si.nMin;
        break;
    case SB_BOTTOM:
        si.nPos = si.nMax;
        break;
    case SB_LINEUP:
        si.nPos -= 1500;
        break;
    case SB_LINEDOWN:
        si.nPos += 1500;
        break;
    case SB_PAGEUP:
        si.nPos -= si.nPage;
        break;
    case SB_PAGEDOWN:
        si.nPos += si.nPage;
        break;
    case SB_THUMBTRACK:
        si.nPos = si.nTrackPos;
        break;
    default:
        break;
    }
    si.fMask = SIF_POS;
    SetScrollInfo(SB_VERT, &si, TRUE);
    if (si.nPos != nPrevPos)
    {
        m_nYPos += si.nPos - nPrevPos;
        ScrollWindow(0, nPrevPos - si.nPos, NULL, NULL);
        Invalidate(FALSE);
        UpdateWindow();
    }


	CDialogEx::OnVScroll(nSBCode, nPos, pScrollBar);
}