myvtm/Other/libimgplayer/CImgPlayerDlg.cpp

// CImgPlayerDlg.cpp : 实现文件
//

#include "stdafx.h"
#include "libimgplayer.h"
#include "CImgPlayerDlg.h"
#include "afxdialogex.h"
#include <io.h>

#define TIMERID 8

CImgPlayerDlg::CImgPlayerDlg(CWnd* pParent /*=NULL*/)
	: CDialogEx(CImgPlayerDlg::IDD, pParent), m_pConfig(NULL)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_bInit = false;
	m_bTimer = false;
	m_hMonitor = NULL;

	m_nPicInx = 0;
	m_nPlayCnt = 0;

	m_pMemDC = new CDC();
	m_pMemBitmap = new CBitmap();
	m_pOldBitmap = NULL;
}

CImgPlayerDlg::CImgPlayerDlg(CImgPlayConfig *pConfig, CWnd* pParent /*= NULL*/)
	: CDialogEx(CImgPlayerDlg::IDD, pParent), m_pMemDC(NULL), m_pMemBitmap(NULL)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_bInit = false;
	m_bTimer = false;
	m_hMonitor = NULL;
	m_pConfig = pConfig;

	m_nPicInx = 0;
	m_nPlayCnt = 0;

	m_pMemDC = new CDC();
	m_pMemBitmap = new CBitmap();
	m_pOldBitmap = NULL;
}

CImgPlayerDlg::~CImgPlayerDlg()
{
	delete m_pMemBitmap; m_pMemBitmap = NULL;
	delete m_pMemDC;  m_pMemBitmap = NULL;
}

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

void CImgPlayerDlg::ShowImage(CImage& img, UINT ID)
{	
	// 获得显示控件的DC
	CDC* pDC = m_pMemDC;
	// 获取HDC(设备句柄)来进行绘图操作
	HDC hDC = pDC->GetSafeHdc();

	CRect rect;
	GetDlgItem(ID)->GetClientRect(&rect);
	// 读取图片控件的宽和高
	int rw = rect.right-rect.left;
	int rh = rect.bottom-rect.top;
	// 设置图片控件背景色为黑色
	CBrush brush(RGB(0,0,0));
	pDC->FillRect(CRect(0, 0, rw, rh), &brush);

	// 读取图片的宽和高
	int iw = img.GetWidth();
	int ih = img.GetHeight();
	// 图片左上角在图片控件中的坐标
	int tx = 0;
	int ty = 0;
	// 图片绘制时的宽和高
	int nw = iw;
	int nh = ih;

	if (iw <= rw && ih <= rh)
	{
		float scale_x = (float) rw / iw;
		float scale_y = (float) rh / ih;
		float scale = scale_x - scale_y >= 1e-6? scale_y : scale_x;

		nw = (int)(iw * scale);
		nh = (int)(ih * scale);

		tx = (scale_x-scale_y >= 1e-6) ? (int)(rw-nw)/2 : 0;
		ty = (scale_x-scale_y >= 1e-6) ? 0 : (int)(rw-nw)/2;
	}
	else
	{
		// 计算横向和纵向缩放因子
		float scale_x = (float)iw / rw;
		float scale_y = (float)ih / rh;
		float scale;
		if (scale_x-scale_y >= 1e-6)
			scale = scale_x;
		else
			scale = scale_y;
		
		// 缩放后图片的宽和高
		nw = (int)(iw/scale);
		nh = (int)(ih/scale);
		
		// 缩放后的图片在m_Image的正中部位绘制，计算图片左上角在m_Image中的坐标
		tx = (scale_x-scale_y >= 1e-6) ? 0 : (int)(rw-nw)/2;
		ty = (scale_x-scale_y >= 1e-6) ? (int)(rh-nh)/2 : 0;
	}

	SetRect(&rect, tx, ty, tx+nw, ty+nh);
	// 将图片绘制到显示控件的指定区域
	SetStretchBltMode(hDC, HALFTONE); // 保持原有图片质量
	SetBrushOrgEx(hDC, 0, 0, NULL);	// 设置刷子的起始点
	img.Draw(hDC,rect);

	brush.DeleteObject();
	//ReleaseDC(pDC);


	m_Image.Destroy(); //主动释放位图资源 相当于对Detach返回的结果执行DeleteObject

	pDC = GetDlgItem(ID)->GetDC();
	GetDlgItem(ID)->GetClientRect(&rect);
	pDC->BitBlt(0, 0, rect.Width(), rect.Height(), m_pMemDC, 0, 0, SRCCOPY);
	//DeleteObject(m_pMemBitmap);
	ReleaseDC(pDC);
}

BEGIN_MESSAGE_MAP(CImgPlayerDlg, CDialogEx)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_SIZE()
	ON_WM_CLOSE()
	ON_WM_TIMER()
	ON_WM_ERASEBKGND()
END_MESSAGE_MAP()


// CImgPlayerDlg 消息处理程序

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

	// 设置此对话框的图标。当应用程序主窗口不是对话框时，框架将自动
	//  执行此操作
	SetIcon(m_hIcon, TRUE);			// 设置大图标
	SetIcon(m_hIcon, FALSE);		// 设置小图标

	long ScreenWidth = GetSystemMetrics(SM_CXSCREEN);  //主屏幕宽度
	long ScreenHeight = GetSystemMetrics(SM_CYSCREEN); //主屏幕高度
		
	MONITORINFOEX mix;
	mix.cbSize = sizeof(mix);
	if (m_pConfig->bPrimMonitor == false) // 默认情况，在副屏显示
	{
		POINT pt;
		pt.x = ScreenWidth+5;
		pt.y = 5;
		m_hMonitor = MonitorFromPoint(pt, MONITOR_DEFAULTTONULL); //尝试获取副屏的句柄
		if (m_hMonitor != NULL)
		{
			GetMonitorInfo(m_hMonitor, (LPMONITORINFO)&mix);
			SetRect(&m_monitorRect, mix.rcMonitor.left, mix.rcMonitor.top, mix.rcMonitor.right, mix.rcMonitor.bottom);
		}
		else
		{
			OnCancel();
			return FALSE;
		}
	}
	else // 在主屏显示
	{
		m_hMonitor = MonitorFromWindow(this->GetSafeHwnd(), MONITOR_DEFAULTTONULL);
		GetMonitorInfo(m_hMonitor, (LPMONITORINFO)&mix);
		SetRect(&m_monitorRect, mix.rcMonitor.left, mix.rcMonitor.top, mix.rcMonitor.right, mix.rcMonitor.bottom);
	}

	// TODO: 在此添加额外的初始化代码
	m_bInit = true;

	// 去掉标题栏和边框
	ModifyStyle(WS_CAPTION, 0, 0);
	ModifyStyleEx(WS_EX_DLGMODALFRAME, 0, 0);

	if (m_pConfig->bFullScreen == true)
	{
		//ShowWindow(SW_MAXIMIZE);	// 设置窗口最大化
		::SetWindowPos(this->GetSafeHwnd(),HWND_TOP,m_monitorRect.left,m_monitorRect.top,
			m_monitorRect.Width(),m_monitorRect.Height(),SWP_SHOWWINDOW); //设置窗口的位置和大小
	}
	else
	{
		if (m_pConfig->nWndWidth > m_monitorRect.Width())
		{
			m_pConfig->nWndWidth = m_monitorRect.Width();
		}
		if (m_pConfig->nWndHeight > m_monitorRect.Height())
		{
			m_pConfig->nWndHeight = m_monitorRect.Height();
		}
		::SetWindowPos(this->GetSafeHwnd(),HWND_TOP,m_monitorRect.left+m_pConfig->nWndX,m_monitorRect.top+m_pConfig->nWndY,
			m_pConfig->nWndWidth,m_pConfig->nWndHeight,SWP_SHOWWINDOW); //设置窗口的位置和大小
	}

	CRect rect;

	this->GetClientRect(&rect);
	
	//使PictureControl填充整个窗口，超出窗口并增加宽高各1个像素，以隐藏PictureControl的边框（注意控件是相对于窗口的）
	::SetWindowPos(GetDlgItem(IDC_ShowImg)->GetSafeHwnd(),HWND_TOP,-1,-1,
		rect.Width()+2,rect.Height()+2,SWP_SHOWWINDOW);
	
	::GetWindowRect(GetDlgItem(IDC_ShowImg)->GetSafeHwnd(), &rect); // 计算PictureControl的屏幕坐标
	//this->ScreenToClient(&rect); // 转换到相对于Dialog客户区的坐标
	//int borderWidth = -rect.left; // 计算边框的厚度

	// 双缓冲机制
	int x = rect.Width();
	int y = rect.Height();
	CDC *pDC = GetDlgItem(IDC_ShowImg)->GetDC();
	m_pMemDC->CreateCompatibleDC(pDC); // 依附图片控件DC创建兼容内存DC
	m_pMemBitmap->CreateCompatibleBitmap(pDC, x, y); // 创建兼容位图
	m_pOldBitmap = m_pMemDC->SelectObject(m_pMemBitmap); // 将位图选进内存DC，原位图保存到m_pOldBitmap
	ReleaseDC(pDC);
	DeleteObject(m_pOldBitmap);

	// 加载并显示第一张图片
	if (m_pConfig->nFileCnt > 0)
	{
		CString imgPath;
		imgPath.Format(_T("%s%s"),m_pConfig->strRootPath,m_pConfig->strFileNames[0]);
		// 判断文件是否存在
		if (_access(LPCTSTR(imgPath), 0) != -1)
		{
			m_Image.Load(LPCTSTR(imgPath));
			ShowImage(m_Image, IDC_ShowImg);
		}
	}

	// 每m_nPlayInterval毫秒显示下一张图片
	if (m_pConfig->nFileCnt > 1)
	{
		if (m_pConfig->nPlayInterval <= 1000)
		{
			m_pConfig->nPlayInterval = 1000;
		}
		SetTimer(TIMERID, m_pConfig->nPlayInterval, 0);
		m_bTimer = true;
	}

	return TRUE;  // 除非将焦点设置到控件，否则返回 TRUE
}

// 如果向对话框添加最小化按钮，则需要下面的代码
//  来绘制该图标。对于使用文档/视图模型的 MFC 应用程序，
//  这将由框架自动完成。

void CImgPlayerDlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // 用于绘制的设备上下文

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// 使图标在工作区矩形中居中
		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;

		// 绘制图标
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialogEx::OnPaint();
	}
}

//当用户拖动最小化窗口时系统调用此函数取得光标
//显示。
HCURSOR CImgPlayerDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}

void CImgPlayerDlg::OnSize(UINT nType, int cx, int cy)
{
	if (m_bInit == FALSE)
		return;
	CDialogEx::OnSize(nType, cx, cy);

	// TODO: 在此处添加消息处理程序代码
	GetDlgItem(IDC_ShowImg)->MoveWindow(0, 0, cx, cy);
}

void CImgPlayerDlg::OnClose()
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值	
	CDialogEx::OnClose();
	EndPlay();
}


void CImgPlayerDlg::OnTimer(UINT_PTR nIDEvent)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	if (nIDEvent == TIMERID)
	{
		m_nPicInx = (m_nPicInx+1)%m_pConfig->nFileCnt;
		if (m_pConfig->nPlayCnt != 0) // 非循环播放
		{
			if (m_nPicInx == 0)
			{
				m_nPlayCnt++;
			}
			if (m_nPlayCnt == m_pConfig->nPlayCnt)//播放次数到了
			{
				// 结束播放
				EndPlay();
				return;
			}
		}
		CString imgPath;
		imgPath.Format(_T("%s%s"),m_pConfig->strRootPath,m_pConfig->strFileNames[m_nPicInx]);
		// 判断文件是否存在
		if (_access((LPCTSTR)imgPath, 0) != -1)
		{
			m_Image.Load(LPCTSTR(imgPath));
			ShowImage(m_Image, IDC_ShowImg);
		}
	}
	CDialogEx::OnTimer(nIDEvent);
}

// 屏蔽背景刷新
BOOL CImgPlayerDlg::OnEraseBkgnd(CDC* pDC)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	return TRUE;
	//return CDialogEx::OnEraseBkgnd(pDC);
}

BOOL CImgPlayerDlg::EndPlay()
{
	// 停止定时器
	if (m_bTimer)
	{
		KillTimer(TIMERID);
		m_bTimer = false;

		// 释放绘图对象
		DeleteObject(m_pMemBitmap);
		ReleaseDC(m_pMemDC);

	}

	// 关闭窗口
	EndDialog(IDCANCEL);

	return TRUE;
}