protected virtual IEnumerable <T> InternalCull(ImageViewState viewState)
{
var culler = new QuadTreeCuller(this.QuadTree);
// because every registered item has been inserted for 4 times (see RegisterItem),
// we use Distinct() to remove duplicated items.
return(culler.Cull(viewState).Distinct());
}
public IEnumerable <T> Cull(ImageViewState viewState)
{
var elements = new List <T>();
if (this.QuadTree.RootNode != null)
{
var cullRect = new Rect(0, 0, viewState.ViewportWidth, viewState.ViewportHeight);
var cullContext = new CullContext(cullRect, viewState);
CullRecursive(elements, cullContext, this.QuadTree.RootNode);
}
return(elements);
}
private void GoFullScreen()
{
BeginInit();
WindowState = WindowState.Maximized;
WindowStyle = WindowStyle.None;
_imageScrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Disabled;
_imageScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Disabled;
_imageViewState = ImageViewState.FullScreen;
var fullScreenSize = this.GetScreenBounds();
_image.Source = _imageFile.GetResizedImage(fullScreenSize);
EndInit();
}
private void GoDetailed()
{
BeginInit();
_imageScrollViewer.ScrollToHorizontalOffset(0);
_imageScrollViewer.ScrollToVerticalOffset(0);
WindowState = WindowState.Maximized;
WindowStyle = WindowStyle.SingleBorderWindow;
_imageScrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;
_imageScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;
_imageViewState = ImageViewState.Detailed;
_image.Source = _imageFile.GetImage();
EndInit();
}
public void Cull(ImageViewState viewState)
{
var cullResult = new HashSet <T>(this.InternalCull(viewState));
var addedItems = new List <T>();
var removedItems = new List <T>();
foreach (var item in cullResult)
{
if (!this.VisibleItems.Contains(item))
{
addedItems.Add(item);
}
}
foreach (var item in this.VisibleItems)
{
if (!cullResult.Contains(item))
{
removedItems.Add(item);
}
}
var countChanged = this.VisibleItems.Count != cullResult.Count;
this.VisibleItems = cullResult;
if (countChanged)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(this.Count)));
}
if (removedItems.Count > 0)
{
this.OnCollectionChanged(
new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, removedItems));
}
if (addedItems.Count > 0)
{
this.OnCollectionChanged(
new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, addedItems));
}
}
public void ChangeMode(ImageViewState mode)
{
if (mode != this.ImageViewState)
{
this.MouseState = MouseState.Idle;
}
this.ImageViewState = mode;
switch (mode)
{
case ImageViewState.Normal:
this.Cursor = Cursors.Hand;
break;
case ImageViewState.Edit:
break;
case ImageViewState.Draw:
break;
default:
break;
}
}
void IOverlay.OnViewStateChanged(ImageViewState viewState)
{
this.OnViewStateChanged(viewState);
}
