public DOMQuad(DOMPoint p1, DOMPoint p2, DOMPoint p3, DOMPoint p4)
{
this.p1 = new DOMPoint(p1);
this.p2 = new DOMPoint(p2);
this.p3 = new DOMPoint(p3);
this.p4 = new DOMPoint(p4);
}
public DOMQuad(DOMPointReadOnly p1, DOMPointReadOnly p2, DOMPointReadOnly p3, DOMPointReadOnly p4)
{
this.p1 = new DOMPoint(p1);
this.p2 = new DOMPoint(p2);
this.p3 = new DOMPoint(p3);
this.p4 = new DOMPoint(p4);
}
public DOMQuad(DOMPointInit p1, DOMPointInit p2, DOMPointInit p3, DOMPointInit p4)
{
this.p1 = new DOMPoint(p1.x, p1.y, p1.z, p1.w);
this.p2 = new DOMPoint(p2.x, p2.y, p2.z, p2.w);
this.p3 = new DOMPoint(p3.x, p3.y, p3.z, p3.w);
this.p4 = new DOMPoint(p4.x, p4.y, p4.z, p4.w);
}
public static DOMQuad fromRect(DOMRectInit R)
{/* Docs: https://www.w3.org/TR/geometry-1/#create-a-domquad-from-the-domrectinit-dictionary */
var p1 = new DOMPoint(R.X, R.Y);
var p2 = new DOMPoint(R.X + R.Width, R.Y);
var p3 = new DOMPoint(R.X + R.Width, R.Y + R.Height);
var p4 = new DOMPoint(R.X, R.Y + R.Height);
return(new DOMQuad(p1, p2, p3, p4));
}
/// <summary>
/// Cancels the ongoing smooth scroll (if any) and resets all associated vars
/// </summary>
private void abort_smooth_scroll()
{
if (smooth_scroller != null)
{
smooth_scroller.Stop();
}
if (IsScrolling)
{/* If we are in the middle of a smooth scroll then just instant finish it */
ScrollX = Smooth_Scroll_Target.x;
ScrollY = Smooth_Scroll_Target.y;
IsScrolling = false;
}
Smooth_Scroll_End_Time = -1;
Smooth_Scroll_Distance = null;
Smooth_Scroll_Target = null;
}
internal void Perform_Scroll(DOMPoint location, Element element, EScrollBehavior behavior = EScrollBehavior.Auto)
{/* Docs: https://www.w3.org/TR/cssom-view-1/#perform-a-scroll */
abort_smooth_scroll();
if (behavior == EScrollBehavior.Auto && element != null && element.Style.ScrollBehavior == EScrollBehavior.Smooth)
{
if (element.Style.ScrollBehavior == EScrollBehavior.Smooth)
{
scroll_to_smooth(location);
return;
}
}
else if (behavior == EScrollBehavior.Smooth)
{
scroll_to_smooth(location);
return;
}
scroll_to_instant(location);
}
private void scroll_to_smooth(DOMPoint location)
{/* https://www.w3.org/TR/cssom-view-1/#concept-smooth-scroll */
if (smooth_scroller == null)
{
smooth_scroller = new ScheduledFunction(this._smooth_scroll_tick, TimeSpan.FromMilliseconds(2));
}
/* Find distance between current position and target position */
double distX = location.x - ScrollX;
double distY = location.y - ScrollY;
/* Calculate our delta step size so we know how much to add to our scroll position per tick */
double deltaX = distX / (double)Smooth_Scroll_Anim_Time.Ticks;
double deltaY = distY / (double)Smooth_Scroll_Anim_Time.Ticks;
Smooth_Scroll_Target = location;
Smooth_Scroll_Distance = new DOMPoint(distX, distY);
/* Set the end time */
Smooth_Scroll_End_Time = (DateTime.Now + Smooth_Scroll_Anim_Time).Ticks;
/* Start scrolling */
smooth_scroller.Start();
}
private void scroll_to_instant(DOMPoint location)
{/* https://www.w3.org/TR/cssom-view-1/#concept-instant-scroll */
this.ScrollX = location.x;
this.ScrollY = location.y;
}
