//只留当前屏幕显示的几个瓦片，其余全部释放
public void Deactive()
{
if (!_isActive)
{
return;
}
try
{
TileIdentify[] visibleTiles;
LevelDef suitableLevel;
_tilesLocator.Compute(_canvas, out suitableLevel, out visibleTiles);
if (visibleTiles == null)
{
return;
}
foreach (TileIdentify tile in visibleTiles)
{
TileBitmap tb = _tileCacheManager.Get(suitableLevel.LevelNo, tile.Row, tile.Col);
if (tb != null)
{
_sleepTileCacheManager.Put(tb);
_tileCacheManager.Remove(tb);
}
}
}
finally
{
SetToSleep();
_isActive = false;
}
}
public void Active()
{
if (_isActive)
{
return;
}
try
{
CreateTileLoadWorker();
if (_sleepTileCacheManager.Count > 0)
{
foreach (TileBitmap tb in _sleepTileCacheManager.TileBitmaps.ToArray())
{
_tileCacheManager.Put(tb);
_sleepTileCacheManager.Remove(tb);
}
}
ReLoadTileBitmapsBySync(_levels);
}
finally
{
_isActive = true;
}
}