symbian 列表

来源：互联网发布：单片机p0口怎么接LED灯编辑：程序博客网时间：2024/04/29 13:59

symbian自定义列表，支持拖拽功能，有阻尼效果

void CListContainer::MoveUp(TUint aDistance)
{
TPoint tl(0,0);
TInt cavasHeight = iCavas->SizeInPixels().iHeight;
TInt count = iItemArray.Count();
TBool meetVisible = EFalse;//遇见可视的列表项
for (TInt i=0; i < count; i++)
{
  CListItem* item = iItemArray[i];
  if (meetVisible)
  {
   item->SetPosition(tl);

   if (tl.iY > cavasHeight)
   {
    item->MakeVisible(EFalse);
    tl.iY += item->Size().iHeight;
   }
   else if (tl.iY > 0)
   {
    item->MakeVisible(ETrue);
    tl.iY += item->Size().iHeight;
   }
   else
   {
    tl.iY += item->Size().iHeight;
    if (tl.iY > 0)
     item->MakeVisible(ETrue);
    else
     item->MakeVisible(EFalse);
   }
  }
  else
  {
   if (item->IsVisible())
   {
    meetVisible = ETrue;
    tl = item->Position();
    tl.iY -= aDistance;
    item->SetPosition(tl);
    tl.iY += item->Size().iHeight;
    if (tl.iY < 0)
     item->MakeVisible(EFalse);
   }
  }
}
if (!meetVisible)
{
  for (TInt i=0; i < count; i++)
  {
   CListItem* item = iItemArray[i];
   tl = item->Position();
   tl.iY -= aDistance;
   item->SetPosition(tl);

   if (tl.iY > cavasHeight)
   {
    item->MakeVisible(EFalse);
   }
   else if (tl.iY > 0)
   {
    item->MakeVisible(ETrue);
   }
   else
   {
    tl.iY += item->Size().iHeight;
    if (tl.iY > 0)
     item->MakeVisible(ETrue);
    else
     item->MakeVisible(EFalse);
   }
  }
}
}

void CListContainer::MoveDown(TUint aDistance)
{
TPoint tl(0,0);
TInt cavasHeight = iCavas->SizeInPixels().iHeight;
TInt count = iItemArray.Count();
TBool meetVisible = EFalse;//遇见可视的列表项
for (TInt i=count-1; i >= 0; i--)
{
  CListItem* item = iItemArray[i];
  if (meetVisible)
  {
   if (tl.iY < 0)
   {
    item->MakeVisible(EFalse);
    tl.iY -= item->Size().iHeight;
   }
   else if (tl.iY < cavasHeight)
   {
    item->MakeVisible(ETrue);
    tl.iY -= item->Size().iHeight;
   }
   else
   {
    tl.iY -= item->Size().iHeight;
    if (tl.iY < cavasHeight)
     item->MakeVisible(ETrue);
    else
     item->MakeVisible(EFalse);
   }
   item->SetPosition(tl);
  }
  else
  {
   if (item->IsVisible())
   {
    meetVisible = ETrue;
    tl = item->Position();
    tl.iY += aDistance;
    item->SetPosition(tl);
    if (tl.iY > cavasHeight)
     item->MakeVisible(EFalse);
   }
  }
}
if (!meetVisible)
{
  for (TInt i=count-1; i >= 0; i--)
  {
   CListItem* item = iItemArray[i];
   tl = item->Position();
   tl.iY += aDistance;
   item->SetPosition(tl);

   if (tl.iY < 0)
   {
    item->MakeVisible(EFalse);
   }
   else if (tl.iY < cavasHeight)
   {
    item->MakeVisible(ETrue);
   }
   else
   {
    tl.iY -= item->Size().iHeight;
    if (tl.iY < cavasHeight)
     item->MakeVisible(ETrue);
    else
     item->MakeVisible(EFalse);
   }
  }
}
}

void CListContainer::Damp()
{
#if 1
TInt count = iItemArray.Count();
TInt cavasHeight = iCavas->SizeInPixels().iHeight;
CListItem* first = iItemArray[0];
CListItem* last = iItemArray[count-1];
if (first->Position().iY > 0)
{
  //开头需要调整
  MoveUp(first->Position().iY);
}
else if (last->Rect().iBr.iY < cavasHeight && first->Position().iY < 0)
{
  //尾部需要调整
  MoveDown(cavasHeight - last->Rect().iBr.iY);
  if (first->Position().iY > 0)
  {
   MoveUp(first->Position().iY);
  }
}
DrawToCavas();
DrawNow();
#endif
}