private ivec2 ComputePlacement(CanvasElement element)
{
Alignments anchor = element.Anchor;
// Using a None anchor allows elements to not be automatically placed (and repositioned) by the canvas.
if (anchor == Alignments.None)
{
return(element.Location);
}
bool left = (anchor & Alignments.Left) > 0;
bool right = (anchor & Alignments.Right) > 0;
bool top = (anchor & Alignments.Top) > 0;
bool bottom = (anchor & Alignments.Bottom) > 0;
ivec2 dimensions = Resolution.WindowDimensions;
ivec2 offset = element.Offset;
int width = dimensions.x;
int height = dimensions.y;
int x = left ? offset.x : (right ? width - offset.x : width / 2 + offset.x);
int y = top ? offset.y : (bottom ? height - offset.y : height / 2 + offset.y);
return(new ivec2(x, y));
}
// This function is only called if an anchor was set (the anchor can be None for free-moving elements that
// aren't locked to a particular anchor location).
private vec2 ComputePlacement(CanvasElement element)
{
var anchor = element.Anchor;
bool left = (anchor & Anchors.Left) > 0;
bool right = (anchor & Anchors.Right) > 0;
bool top = (anchor & Anchors.Top) > 0;
bool bottom = (anchor & Anchors.Bottom) > 0;
var dimensions = Resolution.WindowDimensions;
var offset = element.Offset;
var width = dimensions.x;
var height = dimensions.y;
var x = left ? offset.x : (right ? width - offset.x : width / 2 + offset.x);
var y = top ? offset.y : (bottom ? height - offset.y : height / 2 + offset.y);
return(new vec2(x, y));
}
public void Add(CanvasElement element)
{
var placement = ComputePlacement(element);
if (element.IsCentered)
{
placement -= element.Bounds.Dimensions / 2;
}
element.Location = placement;
element.Canvas = this;
element.Initialize();
elements.Add(element);
if (element.UsesRenderTarget)
{
renderTargetUsers.Add((IRenderTargetUser2D)element);
}
}
private void PlaceElement(CanvasElement element)
{
Alignments anchor = element.Anchor;
bool left = (anchor & Alignments.Left) > 0;
bool right = (anchor & Alignments.Right) > 0;
bool top = (anchor & Alignments.Top) > 0;
bool bottom = (anchor & Alignments.Bottom) > 0;
ivec2 dimensions = Resolution.WindowDimensions;
ivec2 offset = element.Offset;
int width = dimensions.x;
int height = dimensions.y;
int x = left ? offset.x : (right ? width - offset.x : width / 2 + offset.x);
int y = top ? offset.y : (bottom ? height - offset.y : height / 2 + offset.y);
element.Location = new ivec2(x, y);
}
public void Remove(CanvasElement element)
{
var flags = element.flags;
Debug.Assert(element != null, "Can't remove a null canvas element.");
Debug.Assert((flags & CanvasElementFlags.IsChild) == 0, "Can't remove a child element from the canvas " +
"directly (since children are managed by the parent).");
Debug.Assert((flags & CanvasElementFlags.IsRemoved) == 0, "Canvas element was already removed.");
Debug.Assert((flags & CanvasElementFlags.IsAdded) > 0, "Element was never added to the canvas.");
element.flags &= ~CanvasElementFlags.IsAdded;
element.flags |= CanvasElementFlags.IsRemoved;
element.Dispose();
elements.Remove(element);
if (element is IRenderTargetUser2D user)
{
renderTargetUsers.Remove(user);
}
}
public void Remove(CanvasElement element)
{
elements.Remove(element);
}
public void Add(CanvasElement element)
{
elements.Add(element);
PlaceElement(element);
}