public Overlap(bool itemsChanged, ViewPortState old, ViewPortState anew)
{
if (itemsChanged || //cannot make asumptions about order of rows as it could change due to sorting, insers, removal
anew.LastVisibleRowOrMinusOneIfEmpty < old.FirstVisibleRowOrMinusOneIfEmpty || //new is entirely before old
anew.FirstVisibleRowOrMinusOneIfEmpty > old.LastVisibleRowOrMinusOneIfEmpty) //old is entirely before new
{
ToPreTrim = old.IsEmpty ?
Range.CreateEmpty()
:
Range.Create(old.FirstVisibleRow, old.LastVisibleRow);
ToPrepend = Range.CreateEmpty();
ToPostTrim = Range.CreateEmpty();
ToAppend = anew.IsEmpty ?
Range.CreateEmpty()
:
Range.Create(anew.FirstVisibleRow, anew.LastVisibleRow);
return;
}
//partially or entirely contained
var overlapStart = anew.FirstVisibleRow - old.FirstVisibleRow;
var overlapEnd = anew.LastVisibleRow - old.LastVisibleRow;
//new range starts later?
ToPreTrim = overlapStart > 0 ?
Range.Create(old.FirstVisibleRow, old.FirstVisibleRow + overlapStart - 1)
:
Range.CreateEmpty();
//new range begins earlier?
//handles case: when scroll is at bottom and then many (but not all) rows are deleted (f.e. grouping disabled) then wrong overlap would be calculated otherwise
ToPrepend = overlapStart < 0 && anew.FactVisibleRowsCount > 0 ?
Range.Create(anew.FirstVisibleRow, old.FirstVisibleRow - 1)
:
Range.CreateEmpty();
//new range ends earlier?
ToPostTrim = overlapEnd < 0 ?
Range.Create(old.LastVisibleRow + overlapEnd + 1, old.LastVisibleRow)
:
Range.CreateEmpty();
//new range ends later?
ToAppend = overlapEnd > 0 && anew.FactVisibleRowsCount > 0 ?
Range.Create(old.LastVisibleRow + 1, anew.LastVisibleRow)
:
Range.CreateEmpty();
}
public ViewPortState ToViewPortState(Point viewPortSize)
{
var aliveTankDtos = AllTanks.Where(t => !t.IsDead).Select(t => t.ToDto()).ToList();
var aliveShellDtos = AllShells.Where(t => !t.IsDead).Select(t => t.ToDto()).ToList();
var viewPortState = new ViewPortState();
viewPortState.Tanks = aliveTankDtos;
viewPortState.Shells = aliveShellDtos;
var mapper = new CartesianMapper(viewPortSize);
viewPortState.Tanks.ForEach(t => t.Point = mapper.CartesianToScreen(t.Point));
viewPortState.Shells.ForEach(t => t.Point = mapper.CartesianToScreen(t.Point));
return viewPortState;
}
public ViewPortState ToViewPortState(Point viewPortSize)
{
var aliveTankDtos = AllTanks.Where(t => !t.IsDead).Select(t => t.ToDto()).ToList();
var aliveShellDtos = AllShells.Where(t => !t.IsDead).Select(t => t.ToDto()).ToList();
var viewPortState = new ViewPortState();
viewPortState.Tanks = aliveTankDtos;
viewPortState.Shells = aliveShellDtos;
var mapper = new CartesianMapper(viewPortSize);
viewPortState.Tanks.ForEach(t => t.Point = mapper.CartesianToScreen(t.Point));
viewPortState.Shells.ForEach(t => t.Point = mapper.CartesianToScreen(t.Point));
return(viewPortState);
}
public void Tick(ViewPortState viewPortState)
{
IHubContext context = GlobalHost.ConnectionManager.GetHubContext <ViewPortHub>();
context.Clients.All.tick(viewPortState);
}