问题描述

duilib界面库给container添加滚动条后子控件不能正常显示的问题

container子控件需要任意在容器中任意拖拽，就使用了绝对布局，现在要给这个container添加垂直滚动条随子控件位置的改变而改变，现在虽然拖拽和滚动条都实现了，但是当双击向下拖动子控件到一定程度（拖动时顶部有一部分未显示）滚动条以后也不会显示这部分内容了。

解决方案

主要修改的代码如下：

• void CContainerUI::SetPos(RECT rc)
  {
  if( m_pVerticalScrollBar|| m_pHorizontalScrollBar)//modify 2014-11-14
  {
  CControlUI::SetPos(rc);
  rc = m_rcItem;

      // Adjust for inset
      rc.left += m_rcInset.left;
      rc.top += m_rcInset.top;
      rc.right -= m_rcInset.right;
      rc.bottom -= m_rcInset.bottom;
      if( m_pVerticalScrollBar && m_pVerticalScrollBar->IsVisible() )
      {
          rc.right -= m_pVerticalScrollBar->GetFixedWidth();
      }
      if( m_pHorizontalScrollBar && m_pHorizontalScrollBar->IsVisible() )
      {
          rc.bottom -= m_pHorizontalScrollBar->GetFixedHeight();
      }
  
      if( m_items.GetSize() == 0) {
          ProcessScrollBar(rc, 0, 0);
          return;
      }
  
      // Determine the minimum size
      SIZE szAvailable = { rc.right - rc.left, rc.bottom - rc.top };
      if( m_pHorizontalScrollBar && m_pHorizontalScrollBar->IsVisible() )
          szAvailable.cx += m_pHorizontalScrollBar->GetScrollRange();
  
      // Place elements
      int cyNeeded = 0;
      int cyFixedtop = 0;
      int cyFixedbottm = 0;
      for( int it2 = 0; it2 < m_items.GetSize(); it2++ ) {
          CControlUI* pControl = static_cast<CControlUI*>(m_items[it2]);
          if( !pControl->IsVisible() ) continue;
          if( pControl->IsFloat() ) {  //modify 2014-11-14
              SetFloatPos(it2);
          }
  
          //RECT rcPadding = pControl->GetPadding();//外边距在相对布局中才有效
          RECT rt = pControl->GetPos();
          cyFixedbottm = MAX(cyFixedbottm,rt.bottom);
          cyFixedtop = MIN(cyFixedtop,rt.top);
      }
      cyNeeded = MAX(cyFixedbottm-cyFixedtop,szAvailable.cy);
  
      // Process the scrollbar
      ProcessScrollBar(rc, 0, cyNeeded);
  }
  else{
      CControlUI::SetPos(rc);
      if( m_items.IsEmpty() ) return;
      rc.left += m_rcInset.left;
      rc.top += m_rcInset.top;
      rc.right -= m_rcInset.right;
      rc.bottom -= m_rcInset.bottom;
  
      for( int it = 0; it < m_items.GetSize(); it++ ) {
          CControlUI* pControl = static_cast<CControlUI*>(m_items[it]);
          if( !pControl->IsVisible() ) continue;
          if( pControl->IsFloat() ) {
              SetFloatPos(it);
          }
          else {
              pControl->SetPos(rc); // 所有非float子控件放大到整个客户区
          }
      }
  }
  

  }

• void CContainerUI::SetScrollPos(SIZE szPos)
  {

           ..............
  RECT rcPos;
  for( int it2 = 0; it2 < m_items.GetSize(); it2++ ) {
      CControlUI* pControl = static_cast<CControlUI*>(m_items[it2]);
      if( !pControl->IsVisible() ) continue;
      if( (!m_pVerticalScrollBar) && (!m_pHorizontalScrollBar))//modify 2014-11-14
      {
          if( pControl->IsFloat() )
              //SetFloatPos(it2);
              continue;
      }
      rcPos = pControl->GetPos();
      rcPos.left -= cx;
      rcPos.right -= cx;
      rcPos.top -= cy;
      rcPos.bottom -= cy;
      pControl->SetPos(rcPos);
  }
  
  Invalidate();
  

  }

• 滚动条事件响应
• void CContainerUI::DoEvent(TEventUI& event)
  {
  if( !IsMouseEnabled() && event.Type > UIEVENT__MOUSEBEGIN && event.Type < UIEVENT__MOUSEEND ) {
  if( m_pParent != NULL ) m_pParent->DoEvent(event);
  else CControlUI::DoEvent(event);
  return;
  }

  if( event.Type == UIEVENT_TIMER && event.wParam == SCROLL_TIMERID )//modify 2014-11-14
  {
      if( (m_uButtonState1 & UISTATE_CAPTURED) != 0 ) {
          POINT pt = m_pManager->GetMousePos();
          LONG cy = (pt.y - m_ptLastMouse.y);
          m_ptLastMouse = pt;
          SIZE sz = GetScrollPos();
          sz.cy -= cy;
          SetScrollPos(sz);
          return;
      }
      else if( m_dwDelayLeft > 0 ) {
          --m_dwDelayLeft;
          SIZE sz = GetScrollPos();
          LONG lDeltaY =  (LONG)(CalculateDelay((double)m_dwDelayLeft / m_dwDelayNum) * m_dwDelayDeltaY);
          if( (lDeltaY > 0 && sz.cy != 0)  || (lDeltaY < 0 && sz.cy != GetScrollRange().cy ) ) {
              sz.cy -= lDeltaY;
              SetScrollPos(sz);
              return;
          }
      }
      m_dwDelayDeltaY = 0;
      m_dwDelayNum = 0;
      m_dwDelayLeft = 0;
      m_pManager->KillTimer(this, SCROLL_TIMERID);
      return;
  }
  if( event.Type == UIEVENT_BUTTONDOWN && IsEnabled() )
  {
      m_uButtonState1 |= UISTATE_CAPTURED;
      m_ptLastMouse = event.ptMouse;
      m_dwDelayDeltaY = 0;
      m_dwDelayNum = 0;
      m_dwDelayLeft = 0;
      ::SetCursor(::LoadCursor(NULL, MAKEINTRESOURCE(IDC_HAND)));
      m_pManager->SetTimer(this, SCROLL_TIMERID, 50U);
      //return;
  }
  if( event.Type == UIEVENT_BUTTONUP )
  {
      if( (m_uButtonState1 & UISTATE_CAPTURED) != 0 ) {
          m_uButtonState1 &= ~UISTATE_CAPTURED;
          ::SetCursor(::LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW)));
          if( m_ptLastMouse.y != event.ptMouse.y ) {
              m_dwDelayDeltaY = (event.ptMouse.y - m_ptLastMouse.y);
              if( m_dwDelayDeltaY > 120 ) m_dwDelayDeltaY = 120;
              else if( m_dwDelayDeltaY < -120 ) m_dwDelayDeltaY = -120;
              m_dwDelayNum = (DWORD)sqrt((double)abs(m_dwDelayDeltaY)) * 5;
              m_dwDelayLeft = m_dwDelayNum;
          }
          else
              m_pManager->KillTimer(this, SCROLL_TIMERID);
      }
      //return;
  }
  if( event.Type == UIEVENT_SCROLLWHEEL )
  {
      LONG lDeltaY = 0;
      if( m_dwDelayNum > 0 ) lDeltaY =  (LONG)(CalculateDelay((double)m_dwDelayLeft / m_dwDelayNum) * m_dwDelayDeltaY);
      switch( LOWORD(event.wParam) ) {
          case SB_LINEUP:
              if( m_dwDelayDeltaY >= 0 ) m_dwDelayDeltaY = lDeltaY + 8;
              else m_dwDelayDeltaY = lDeltaY + 12;
              break;
          case SB_LINEDOWN:
              if( m_dwDelayDeltaY <= 0 ) m_dwDelayDeltaY = lDeltaY - 8;
              else m_dwDelayDeltaY = lDeltaY - 12;
              break;
      }
      if( m_dwDelayDeltaY > 100 ) m_dwDelayDeltaY = 100;
      else if( m_dwDelayDeltaY < -100 ) m_dwDelayDeltaY = -100;
      m_dwDelayNum = (DWORD)sqrt((double)abs(m_dwDelayDeltaY)) * 5;
      m_dwDelayLeft = m_dwDelayNum;
      m_pManager->SetTimer(this, SCROLL_TIMERID, 50U);
      return;
  }
  

解决方案二：

直接使用HorLayout或者VerLayout就行了