statusbarwithprogress.cpp

C++编程实践与技巧一书各章节的源码

#include "StdAfx.H"

#include "StatusBarWithProgress.h"



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



#define ID_STATUS_PROGRESS  17234//状态条中的进度条标识



IMPLEMENT_DYNCREATE(CStatusBarWithProgress,CStatusBar)

BEGIN_MESSAGE_MAP(CStatusBarWithProgress,CStatusBar)
	//{{AFX_MSG_MAP(CStatusBarWithProgress)
	ON_WM_SIZE()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

//---------------------------------------------------------------------------
CStatusBarWithProgress::CStatusBarWithProgress(int nProgressBarWidth):
                        m_nProgressWidth(nProgressBarWidth),
                        m_bProgressVisible(FALSE)
{
}

//创建状态条和进度条，但不显示进度条
//---------------------------------------------------------------------------
BOOL CStatusBarWithProgress::Create(CWnd *pParentWnd, DWORD dwStyle, UINT nID)
{
    // Default creation
    BOOL bCreatedOK =CStatusBar::Create(pParentWnd,dwStyle,nID);
    if(bCreatedOK)
    {
        // 创建进度条
        m_Progress.Create(WS_CHILD | WS_EX_STATICEDGE | PBS_SMOOTH,CRect(0,0,m_nProgressWidth,10),this,ID_STATUS_PROGRESS);
    }

    return bCreatedOK;
}

// 显示/隐藏进度条
//---------------------------------------------------------------------------
BOOL CStatusBarWithProgress::ShowProgressBar(BOOL bShow)
{
    //存储原来是否可见状态
    BOOL bOldVisible =m_bProgressVisible;

    if((bOldVisible != bShow) && ::IsWindow(m_Progress.m_hWnd))
    {
        //显示/隐藏
        m_Progress.ShowWindow(bShow ? SW_SHOWNA : SW_HIDE);
        m_bProgressVisible =bShow;

        //如果显示，要求进度条在合适位置
        if(bShow)
        {
            AdjustProgressBarPosition();
            RedrawWindow(NULL,NULL,RDW_INVALIDATE | RDW_UPDATENOW);
        }
    }

    return bOldVisible;
}

//调整进度条位置，使其位于进度条最左边文字面板的右边
//---------------------------------------------------------------------------
void CStatusBarWithProgress::AdjustProgressBarPosition()
{
    // 确信进度条已经创建
    if(!::IsWindow(m_Progress.m_hWnd))
        return;

    //找出状态条最左边文字面板的大小
    CString str_pane_text;
    CRect   progress_rect;
    GetItemRect(0,progress_rect);
    GetPaneText(0,str_pane_text);
    
    CClientDC temp(this);
    CFont *pOldFont =temp.SelectObject(GetFont());

    progress_rect.left  =temp.GetTextExtent(str_pane_text).cx + 10;
    progress_rect.right =progress_rect.left + m_nProgressWidth;
    progress_rect.InflateRect(0,-1);

    temp.SelectObject(pOldFont);

    //调整进度条控件大小
    m_Progress.SetWindowPos(NULL,progress_rect.left,
                                 progress_rect.top,
                                 progress_rect.Width(),
                                 progress_rect.Height(),SWP_NOZORDER | SWP_NOACTIVATE);
}

//当窗口变化时，动态调整进度条位置
//---------------------------------------------------------------------------
void CStatusBarWithProgress::OnSize(UINT nType, int cx, int cy) 
{
    // 默认大小
	CStatusBar::OnSize(nType, cx, cy);
	
    if(m_bProgressVisible)
        AdjustProgressBarPosition();
}