progressbar.cpp

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// ProgressBar.cpp : implementation file
//

#include "stdafx.h"
#include "视频编解码器.h"
#include "ProgressBar.h"

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

/////////////////////////////////////////////////////////////////////////////
// CProgressBar

CProgressBar::CProgressBar()
{
	m_bSuccess = FALSE;
	m_Rect.SetRect(0,0,0,0);

}
CProgressBar::CProgressBar(LPCTSTR strMessage, int nSize /* = 100 */, 
                           int MaxValue /* = 100 */, BOOL bSmooth /* = FALSE */)
{
    Create(strMessage, nSize, MaxValue, bSmooth);
}
CProgressBar::~CProgressBar()
{
	 Clear();
}


BEGIN_MESSAGE_MAP(CProgressBar, CProgressCtrl)
	//{{AFX_MSG_MAP(CProgressBar)
	ON_WM_ERASEBKGND()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CProgressBar message handlers


// Create the CProgressCtrl as a child of the status bar positioned
// over the first pane, extending "nSize" percentage across pane.
// Sets the range to be 0 to MaxValue, with a step of 1.
BOOL CProgressBar::Create(LPCTSTR strMessage, int nSize, int MaxValue, 
						  BOOL bSmooth /*=FALSE*/)
{
    m_bSuccess = FALSE;
    
    CStatusBar *pStatusBar = GetStatusBar();
    if (!pStatusBar) return FALSE;

	DWORD dwStyle = WS_CHILD|WS_VISIBLE;
#ifdef PBS_SMOOTH	
	if (bSmooth)
		dwStyle |= PBS_SMOOTH;
#endif

    // Create the progress bar
    VERIFY(m_bSuccess = CProgressCtrl::Create(dwStyle, CRect(0,0,0,0), pStatusBar, 1));
    if (!m_bSuccess) return FALSE;

    // Set range and step
    SetRange(0, MaxValue);
    SetStep(1);

    m_strMessage = strMessage;
    m_nSize		 = nSize;

    // Resize the control to its desired width
    Resize();

    return TRUE;
}

void CProgressBar::SetRange(int nLower, int nUpper, int nStep /* = 1 */)	
{
    if (!m_bSuccess) return;
    CProgressCtrl::SetRange(nLower, nUpper);
    CProgressCtrl::SetStep(nStep);
}

void CProgressBar::SetText(LPCTSTR strMessage)
{ 
	m_strMessage = strMessage; 
	Resize(); 
}
void CProgressBar::SetSize(int nSize)
{
	m_nSize = nSize; 
	Resize();
}
int  CProgressBar::SetStep(int nStep)
{ 
    ModifyStyle(0,WS_VISIBLE);
    return (m_bSuccess)? CProgressCtrl::SetStep(nStep) : 0;	
}
int  CProgressBar::StepIt()			 
{ 
    ModifyStyle(0,WS_VISIBLE);
    return (m_bSuccess)? CProgressCtrl::StepIt() : 0;	
}
void CProgressBar::Clear()
{
    // Hide the window. This is necessary so that a cleared
    // window is not redrawn if "Resise" is called
    ModifyStyle(WS_VISIBLE, 0);

    // Get the IDLE_MESSAGE
    CString str;
    str.LoadString(AFX_IDS_IDLEMESSAGE);

    // Place the IDLE_MESSAGE in the status bar 
    CStatusBar *pStatusBar = GetStatusBar();
    if (pStatusBar) pStatusBar->SetWindowText(str);
}

BOOL CProgressBar::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default
    Resize();
	return CProgressCtrl::OnEraseBkgnd(pDC);
}

CStatusBar* CProgressBar::GetStatusBar()
{
    CFrameWnd *pFrame = (CFrameWnd*)AfxGetMainWnd();
    if (!pFrame || !pFrame->IsKindOf(RUNTIME_CLASS(CFrameWnd))) 
        return NULL;

    CStatusBar* pBar = (CStatusBar*) pFrame->GetMessageBar();
    if (!pBar || !pBar->IsKindOf(RUNTIME_CLASS(CStatusBar))) 
        return NULL;

    return pBar;
}
void CProgressBar::Resize() 
{	
    CStatusBar *pStatusBar = GetStatusBar();
    if (!pStatusBar) return;

    // Redraw the window text
    if (::IsWindow(m_hWnd) && IsWindowVisible()) {
        pStatusBar->SetWindowText(m_strMessage);
        pStatusBar->UpdateWindow();
    }

    // Calculate how much space the text takes up
    CClientDC dc(pStatusBar);
    CFont *pOldFont = dc.SelectObject(pStatusBar->GetFont());
    CSize size = dc.GetTextExtent(m_strMessage);		// Length of text
    int margin = dc.GetTextExtent(_T(" ")).cx * 2;		// Text margin
    dc.SelectObject(pOldFont);

    // Now calculate the rectangle in which we will draw the progress bar
    CRect rc;
    pStatusBar->GetItemRect (0, rc);
    rc.left = size.cx + 2*margin;
    rc.right = rc.left + (rc.right - rc.left) * m_nSize / 100;
    if (rc.right < rc.left) rc.right = rc.left;
    
    // Leave a litle vertical margin (10%) between the top and bottom of the bar
    int Height = rc.bottom - rc.top;
    rc.bottom -= Height/10;
    rc.top    += Height/10;

    // Resize the window
    if (::IsWindow(m_hWnd) && (rc != m_Rect))
        MoveWindow(&rc);

	m_Rect = rc;
}