MFC缩放对话框的实现

最新推荐文章于 2023-09-21 14:42:29 发布

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最新推荐文章于 2023-09-21 14:42:29 发布

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分类专栏： MFC教程文章标签： mfc null timer file playback filter

本文链接：https://blog.youkuaiyun.com/wuqinxiang/article/details/7867090

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本文档展示了如何在MFC中创建一个媒体播放对话框，并实现了对话框的缩放功能。通过创建和销毁滤镜图，以及设置播放、暂停、全屏等控制，确保了媒体文件的播放和用户交互。同时，使用滑块控件来调整播放位置，并处理对话框大小变化时的控件布局调整。

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#pragma once
#include <atlbase.h>
#include "DShow.h"
#include "DXGraph.h"
#include "afxwin.h"
#include "afxcmn.h"

// CDlgMedia 对话框

class CDlgMedia : public CDialog
{
DECLARE_DYNAMIC(CDlgMedia)

public:
CDlgMedia(CWnd* pParent = NULL); // 标准构造函数
virtual ~CDlgMedia();

// 对话框数据
enum { IDD = IDD_MEDIAPLAYER };

protected:
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV 支持

DECLARE_MESSAGE_MAP()
public:
afx_msg void OnBnClickedOpenfile();
virtual BOOL OnInitDialog();
private:
CDXGraph *m_pFilterGraph;
CString m_sSourceFile;
UINT m_SliderTimer;

void CreateGraph();
void DestroyGraph();
void RestoreFromFullScreen(void);
void GetDlgRect(int *w,int *h);
void StretchControl(int offx,int offy);

public:
CStatic m_VideoWindow;
CSliderCtrl m_SliderGraph;
afx_msg void OnBnClickedBtnPlayPause();
afx_msg BOOL OnEraseBkgnd(CDC* pDC);
private:
CRect m_rectBottm[5];
CRect m_rectLabel;
CRect m_rectList;
CRect m_rectSlide;
public:
int m_nDlgWidth;
int m_nDlgHeight;
bool m_bfirstResize;

CButton m_btnOpen;
CButton m_btnReplay;
CButton m_btnPre;
CButton m_btnPlay;
CButton m_btnNext;
CListCtrl m_lstVideo;
afx_msg void OnSize(UINT nType, int cx, int cy);
afx_msg void OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
afx_msg void OnTimer(UINT_PTR nIDEvent);
};

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// CDlgMedia.cpp : 实现文件
//

#include "stdafx.h"
#include "MyClass.h"
#include "CDlgMedia.h"

// CDlgMedia 对话框

IMPLEMENT_DYNAMIC(CDlgMedia, CDialog)

CDlgMedia::CDlgMedia(CWnd* pParent /*=NULL*/)
: CDialog(CDlgMedia::IDD, pParent)
{
m_pFilterGraph = NULL;
m_sSourceFile = "";
m_SliderTimer = 0;
m_bfirstResize = true;
}

CDlgMedia::~CDlgMedia()
{
}

void CDlgMedia::DoDataExchange(CDataExchange* pDX)
{
CDialog::DoDataExchange(pDX);
DDX_Control(pDX, IDC_MEDIASCREEN, m_VideoWindow);
DDX_Control(pDX, IDC_SLIDER1, m_SliderGraph);
DDX_Control(pDX, IDC_OPENFILE, m_btnOpen);
DDX_Control(pDX, IDC_BTN_REPLAY, m_btnReplay);
DDX_Control(pDX, IDC_BTN_PRE, m_btnPre);
DDX_Control(pDX, IDC_BTN_PLAY_PAUSE, m_btnPlay);
DDX_Control(pDX, IDC_BTN_NEXT, m_btnNext);
DDX_Control(pDX, IDC_NAME_LIST, m_lstVideo);
}

BEGIN_MESSAGE_MAP(CDlgMedia, CDialog)
ON_BN_CLICKED(IDC_OPENFILE, &CDlgMedia::OnBnClickedOpenfile)
ON_BN_CLICKED(IDC_BTN_PLAY_PAUSE, &CDlgMedia::OnBnClickedBtnPlayPause)
ON_WM_ERASEBKGND()
ON_WM_SIZE()
ON_WM_HSCROLL()
ON_WM_TIMER()
END_MESSAGE_MAP()

// CDlgMedia 消息处理程序

void CDlgMedia::OnBnClickedOpenfile()
{
CString    strFilter = "AVI File (*.avi)|*.avi|";
strFilter += "MPEG File (*.mpg;*.mpeg)|*.mpg;*.mpeg|";
strFilter += "Mp3 File (*.mp3)|*.mp3|";
strFilter += "Wave File (*.wav)|*.wav|";
strFilter += "All Files (*.*)|*.*|";
CFileDialog dlgOpen(TRUE, NULL, NULL, OFN_PATHMUSTEXIST | OFN_HIDEREADONLY,
  strFilter, this);
if (IDOK == dlgOpen.DoModal())
{
  m_sSourceFile = dlgOpen.GetPathName();
  // Rebuild the file playback filter graph
  CreateGraph();
}
// TODO: 在此添加控件通知处理程序代码
}

BOOL CDlgMedia::OnInitDialog()
{
CDialog::OnInitDialog();
m_VideoWindow.ModifyStyle(0,WS_CLIPCHILDREN);
m_SliderGraph.SetRange(0,1000);
m_SliderGraph.SetPos(0);
m_bfirstResize = false;
InitialPosition();

// TODO: 在此添加额外的初始化

return TRUE; // return TRUE unless you set the focus to a control
// 异常: OCX 属性页应返回 FALSE
}

void CDlgMedia::CreateGraph()
{
DestroyGraph();
m_pFilterGraph = new CDXGraph();
if (m_pFilterGraph->Create())
{
  m_pFilterGraph->RenderFile(m_sSourceFile);
  m_pFilterGraph->SetDisplayWindow(m_VideoWindow.GetSafeHwnd());
  m_pFilterGraph->SetNotifyWindow(this->GetSafeHwnd());
  m_pFilterGraph->Pause();

}

void CDlgMedia::DestroyGraph()
{
if (m_pFilterGraph != NULL)
{
  m_pFilterGraph->Stop();
  m_pFilterGraph->SetNotifyWindow(NULL);
  delete m_pFilterGraph;
  m_pFilterGraph = NULL;
}

}

void CDlgMedia::RestoreFromFullScreen(void)
{
if (m_pFilterGraph != NULL)
{
if (m_pFilterGraph -> GetFullScreen())
m_pFilterGraph->SetFullScreen(FALSE);

}
}

void CDlgMedia::InitialPosition()
{
m_VideoWindow.GetWindowRect(&m_rectLabel);
ScreenToClient(&m_rectLabel);
m_lstVideo.GetWindowRect(&m_rectList);
ScreenToClient(&m_rectList);
m_SliderGraph.GetWindowRect(&m_rectSlide);
ScreenToClient(&m_rectSlide);
m_btnOpen.GetWindowRect(&m_rectBottm[0]);
ScreenToClient(&m_rectBottm[0]);
m_btnReplay.GetWindowRect(&m_rectBottm[1]);
ScreenToClient(&m_rectBottm[1]);
m_btnPre.GetWindowRect(&m_rectBottm[2]);
ScreenToClient(&m_rectBottm[2]);
m_btnPlay.GetWindowRect(&m_rectBottm[3]);
ScreenToClient(&m_rectBottm[3]);
m_btnNext.GetWindowRect(&m_rectBottm[4]);
ScreenToClient(&m_rectBottm[4]);
GetDlgRect(&m_nDlgWidth,&m_nDlgHeight);
}

void CDlgMedia::GetDlgRect(int *w,int *h)
{
CRect client;
this->GetWindowRect(&client);
*w = client.Width();
*h = client.Height();
}

void CDlgMedia::OnBnClickedBtnPlayPause()//播放
{
if(m_pFilterGraph != NULL)
{
  m_pFilterGraph->Run();
  if (m_SliderTimer == 0)
  {
   m_SliderTimer = this->SetTimer(SLIDER_TIMER,100,NULL);
  }
}
// TODO: 在此添加控件通知处理程序代码
}

BOOL CDlgMedia::OnEraseBkgnd(CDC* pDC)
{
RECT rect;
m_VideoWindow.GetWindowRect(&rect);
ScreenToClient(&rect);
pDC-> ExcludeClipRect(&rect);

// TODO: 在此添加消息处理程序代码和/或调用默认值

return CDialog::OnEraseBkgnd(pDC);
}

void CDlgMedia::OnSize(UINT nType, int cx, int cy)
{
CDialog::OnSize(nType, cx, cy);
if (m_bfirstResize == false)
{
  int offx,offy;
  int w,h;
  GetDlgRect(&w,&h);
  offx = w - m_nDlgWidth;
  offy = h - m_nDlgHeight;
  StretchControl(offx,offy);

}

// TODO: 在此处添加消息处理程序代码
}

void CDlgMedia::StretchControl(int offx,int offy)
{

m_btnOpen.MoveWindow(m_rectBottm[0].left+offx/2,m_rectBottm[0].top+offy,m_rectBottm[0].Width(),m_rectBottm[0].Height());
m_btnReplay.MoveWindow(m_rectBottm[1].left+offx/2,m_rectBottm[1].top+offy,m_rectBottm[1].Width(),m_rectBottm[1].Height());
m_btnPre.MoveWindow(m_rectBottm[2].left+offx/2,m_rectBottm[2].top+offy,m_rectBottm[2].Width(),m_rectBottm[2].Height());
m_btnPlay.MoveWindow(m_rectBottm[3].left+offx/2,m_rectBottm[3].top+offy,m_rectBottm[3].Width(),m_rectBottm[3].Height());
m_btnNext.MoveWindow(m_rectBottm[4].left+offx/2,m_rectBottm[4].top+offy,m_rectBottm[4].Width(),m_rectBottm[4].Height());

m_VideoWindow.MoveWindow(m_rectLabel.left,m_rectLabel.top,m_rectLabel.Width()+offx,m_rectLabel.Height()+offy);
m_lstVideo.MoveWindow(m_rectList.left+offx,m_rectList.top,m_rectList.Width()+offx,m_rectList.Height()+offy);
m_SliderGraph.MoveWindow(m_rectSlide.left,m_rectSlide.top+offy,m_rectSlide.Width()+offx,m_rectSlide.Height());

}

void CDlgMedia::OnHScroll(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
if (pScrollBar->GetSafeHwnd() == m_SliderGraph.GetSafeHwnd())
{
  if (m_pFilterGraph)
  {
   // Calculate the current seeking position
   double duration = 1.;
   m_pFilterGraph->GetDuration(&duration);
   double pos = duration * m_SliderGraph.GetPos()/1000.;
   m_pFilterGraph->SetCurrentPosition(pos);
  }
}
CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}

void CDlgMedia::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 == SLIDER_TIMER && m_pFilterGraph)
{
  double pos = 0, duration = 1.;
  m_pFilterGraph->GetCurrentPosition(&pos);
  m_pFilterGraph->GetDuration(&duration);
  // Get the new position, and update the slider
  int newPos = int(pos * 1000 / duration);
  if (m_SliderGraph.GetPos() != newPos)
  {
   m_SliderGraph.SetPos(newPos);
  }
}

CDialog::OnTimer(nIDEvent);
}