private void SetMouseHoverCore(Fragment fragment)
{
fragment.IsMouseHover = true;
fragment.MouseEnter();
MouseHoverFragments.Add(fragment);
}
public int Compare(Fragment fragment, Fragment _) => fragment.Bounds.Y < Offset ? -1 : 1;
public virtual void MouseChanged(MouseState mouse)
{
if (Items.Count == 0)
{
return;
}
var pos = mouse.Position;
int spatialBlockIndex = Math.Min(SpatialIndex.Count - 1, (int)(pos.Y / SpatialBlockHeight));
int firstFragment = 0, lastFragment = Items.Count - 1;
if (spatialBlockIndex >= 0)
{
lastFragment = SpatialIndex[spatialBlockIndex];
if (spatialBlockIndex > 0)
{
firstFragment = SpatialIndex[spatialBlockIndex - 1];
}
}
var selectionLayer = Owner.SelectionLayer;
var oldSelection = new { selectionLayer.SelectionStart, selectionLayer.SelectionEnd };
bool selected = false;
Fragment hitFragment = null, firstLineHit = null, lastLineHit = null;
for (int i = firstFragment; i <= lastFragment; i++)
{
var fragment = Items[i];
if (fragment.Contains(pos))
{
hitFragment = fragment;
if (mouse.IsOverView)
{
TrySetMouseHover(fragment);
}
if (mouse.IsSelecting)
{
selected = selectionLayer.TrySetSelection(fragment);
}
break;
}
else if (lastLineHit == null)
{
var bounds = fragment.Bounds;
if (pos.Y >= bounds.Top && pos.Y <= bounds.Bottom)
{
if (firstLineHit == null)
{
firstLineHit = fragment;
}
lastLineHit = fragment;
}
}
}
if (mouse.IsSelecting && !selected)
{
if (hitFragment != null) // mouse is inside of some fragment
{
// find nearest selectable fragment
selectionLayer.SetNearestSelection(hitFragment, pos);
}
else
{
if (firstLineHit == null)
{
firstLineHit = Items.FirstOrDefault();
lastLineHit = Items.LastOrDefault();
}
if (firstLineHit != null) // mouse is outside of any fragment
{
// find first or last selectable fragment
var firstBounds = firstLineHit.Bounds;
var lastBounds = lastLineHit.Bounds;
if (pos.Y < firstBounds.Top || (pos.X < firstBounds.Left && pos.Y >= firstBounds.Top && pos.Y <= firstBounds.Bottom))
{
selectionLayer.SetNearestSelection(firstLineHit, pos);
}
else if (pos.Y > lastBounds.Bottom || (pos.X > lastBounds.Right && pos.Y >= lastBounds.Top && pos.Y <= lastBounds.Bottom))
{
selectionLayer.SetNearestSelection(lastLineHit, pos);
}
}
}
}
LeaveUnhoveredFragments(mouse);
if (mouse.IsSelecting && !oldSelection.Equals(new { selectionLayer.SelectionStart, selectionLayer.SelectionEnd }))
{
Owner.InvalidateArrange();
}
}
