private void CalculateMetrics(TreeItemCollection items, ref DrawContext context)
{
foreach (var item in items)
{
var props = new TreeItemProperties();
props.item = item;
props.bounds = new RectangleF(0,
context.offset * context.lineHeight,
Width, context.lineHeight);
props.selectBounds = new RectangleF(10 + context.indent * context.indentWidth,
(context.offset + 0.5f) * context.lineHeight - 8,
16, 16);
props.textBounds = new RectangleF(context.indent * context.indentWidth + 30,
context.offset++ *context.lineHeight, Width, context.lineHeight);
properties[item] = props;
if (item.Expanded && item.Children.Count > 0)
{
context.indent++;
CalculateMetrics(item.Children, ref context);
context.indent--;
}
}
}
protected internal override void OnMouseMove(MouseEventArgs e)
{
var position = scroller.ToScrollSpace(e.Position);
if (TryFindItem(position, out var prop))
{
hover = prop;
checkHover = prop.selectBounds.Contains(position.X, position.Y);
}
}
private bool TryFindItem(Vector2 point, out TreeItemProperties property)
{
foreach (var item in properties)
{
if (item.Value.bounds.Contains(point.X, point.Y))
{
property = item.Value;
return(true);
}
}
property = default;
return(false);
}