internal VertexState(VertexWidget widget)
{
Verify.Argument.IsNotNull(widget, nameof(widget));
Widget = widget;
Position = widget.Position;
}
protected override void OnVertexWidgetMoved(VertexWidget widget, Point offset)
{
Assert.IsNotNull(widget);
var wloc = widget.Position;
wloc.Offset(offset);
var regionBounds = GetRegionBounds();
if (!regionBounds.IsEmpty)
{
wloc = ClampVertexPosition(wloc, regionBounds);
}
widget.Position = wloc;
Widget.Invalidate();
OnVertexMoved(EventArgs.Empty);
}
protected override string GetLabelText(VertexWidget widget)
{
var p = GetRelationPos(widget.Position);
return($"{p.X.ToPercent():0.0}, {p.Y.ToPercent():0.0}");
}
protected override void OnVertexWidgetMoved(VertexWidget widget, Point offset)
{
Assert.IsNotNull(widget);
var regionBounds = GetRegionBounds();
if (regionBounds.IsEmpty)
{
return;
}
var wloc = widget.Position;
wloc.Offset(offset);
wloc = ClampVertexPosition(wloc, regionBounds);
var invalidRect = Widget.GetInvalidRect();
var prevWidget = widget.GetPrev();
var isHorizontal = IsHorizontal(widget.Position, prevWidget);
{
if (isHorizontal)
{
if (MinimumSize.Width != 0)
{
var diffX = wloc.X - prevWidget.Position.X;
if (Math.Abs(diffX) < MinimumSize.Width)
{
wloc = new Point(prevWidget.Position.X + (diffX < 0 ? -1 : 1) * MinimumSize.Width, wloc.Y);
}
}
}
else
{
if (MinimumSize.Height != 0)
{
var diffY = wloc.Y - prevWidget.Position.Y;
if (Math.Abs(diffY) < MinimumSize.Height)
{
wloc = new Point(wloc.X, prevWidget.Position.Y + (diffY < 0 ? -1 : 1) * MinimumSize.Height);
}
}
}
}
var nextWidget = widget.GetNext();
{
if (!isHorizontal)
{
if (MinimumSize.Width != 0)
{
var diffX = wloc.X - nextWidget.Position.X;
if (Math.Abs(diffX) < MinimumSize.Width)
{
wloc = new Point(nextWidget.Position.X + (diffX < 0 ? -1 : 1) * MinimumSize.Width, wloc.Y);
}
}
}
else
{
if (MinimumSize.Height != 0)
{
var diffY = wloc.Y - nextWidget.Position.Y;
if (Math.Abs(diffY) < MinimumSize.Height)
{
wloc = new Point(wloc.X, nextWidget.Position.Y + (diffY < 0 ? -1 : 1) * MinimumSize.Height);
}
}
}
}
if (prevWidget != null)
{
prevWidget.Position = isHorizontal
? new Point(prevWidget.Position.X, wloc.Y)
: new Point(wloc.X, prevWidget.Position.Y);
}
if (nextWidget != null)
{
nextWidget.Position = !isHorizontal
? new Point(nextWidget.Position.X, wloc.Y)
: new Point(wloc.X, nextWidget.Position.Y);
}
widget.Position = wloc;
invalidRect = Rectangle.Union(invalidRect, Widget.GetInvalidRect());
Widget.Invalidate(invalidRect);
OnVertexMoved(EventArgs.Empty);
}
private static bool IsHorizontal(Point p1, VertexWidget w2)
{
return(Math.Abs(p1.X - w2.Position.X) > Math.Abs(p1.Y - w2.Position.Y));
}
protected abstract void OnVertexWidgetMoved(VertexWidget widget, Point offset);
protected virtual string GetLabelText(VertexWidget widget) => $"{widget.Position.X}, {widget.Position.Y}";