一個類似千千靜聽進度條的SLIDER （非視覺效果）

 

 

BOOL CPlayerTestDlg::PreTranslateMessage(MSG* pMsg) { //TODO: Add your specialized code here and/or call the base class CPoint point; if (pMsg->message == WM_LBUTTONDOWN && pMsg->hwnd == GetDlgItem(IDC_SLIDER)->GetSafeHwnd()) { GetCursorPos(&point); ScreenToClient(&point); OnSliderLMouseDown(point); return TRUE; } else if (pMsg->message == WM_LBUTTONUP && m_sliderleftmousedown == TRUE) { GetCursorPos(&point); ScreenToClient(&point); OnSliderLMouseUp(point); return TRUE; } else if (pMsg->message == WM_MOUSEMOVE && m_sliderleftmousedown == TRUE) { GetCursorPos(&point); ScreenToClient(&point); OnSliderLMouseMove(point); return TRUE; } return CDialog::PreTranslateMessage(pMsg); } BOOL CPlayerTestDlg::OnSliderLMouseDown(CPoint point) { if (!DestroyThread()) { return FALSE; } ::SetCapture(this.GetSafeHwnd()); CRect rect; m_playerslider.GetWindowRect(&rect); ScreenToClient(&rect); RECT rc; m_playerslider.GetThumbRect(&rc); //此值的座標系爲SLIDER int nThumbLeft = rc.left + rect.left; //改成以CLIENT爲座標系的值 int nThumbRight = rc.right + rect.left; if (point.x >= nThumbLeft && point.x <= nThumbRight) { m_sliderleftmousedown = TRUE; } else { int nSliderPos; nSliderPos = ((point.x - rect.left) * (m_playerslider.GetRangeMax() - m_playerslider.GetRangeMin())) / (rect.right - rect.left) + m_playerslider.GetRangeMin(); m_playerslider.SetPos(nSliderPos); SetPlayPos(m_playerslider.GetPos()); ::ReleaseCapture(); StartThread(); } return TRUE; } BOOL CPlayerTestDlg::OnSliderLMouseUp(CPoint point) { CRect rect; m_playerslider.GetWindowRect(&rect); ScreenToClient(&rect); int nSliderPos; if (point.x < rect.left) { nSliderPos = m_playerslider.GetRangeMin(); } else if (point.x > rect.right) { nSliderPos = m_playerslider.GetRangeMax(); } else { nSliderPos = ((point.x - rect.left) * (m_playerslider.GetRangeMax() - m_playerslider.GetRangeMin())) / (rect.right - rect.left) + m_playerslider.GetRangeMin(); } m_playerslider.SetPos(nSliderPos); SetPlayPos(m_playerslider.GetPos()); m_sliderleftmousedown = FALSE; ::ReleaseCapture(); StartThread(); return TRUE; } BOOL CPlayerTestDlg::OnSliderLMouseMove(CPoint point) { CRect rect; m_playerslider.GetWindowRect(&rect); ScreenToClient(&rect); int nSliderPos; if (point.x < rect.left) { nSliderPos = m_playerslider.GetRangeMin(); } else if (point.x > rect.right) { nSliderPos = m_playerslider.GetRangeMax(); } else { nSliderPos = ((point.x - rect.left) * (m_playerslider.GetRangeMax() - m_playerslider.GetRangeMin())) / (rect.right - rect.left) + m_playerslider.GetRangeMin(); } m_playerslider.SetPos(nSliderPos); return TRUE; }

 

對上面 DestroyThread() 與 StartThread() 函數的說明：對於進度條實時滾動，我是創建了一條線程，不停的讀取播放的幀，然後處理後設置slider的 滑動塊的位置

DestroyThread:

停止線程，使SLIDER不在滑動

 

StartThread:

開啓線程，使SLIDER繼續實時滑動

 

SetPlayPos():

該函數是用於根據滑塊的位置來設置該播放的幀