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using System.Collections.Generic;
using UIWidgets.painting;
using UIWidgets.ui;
using Matrix4x4 = UnityEngine.Matrix4x4;
namespace UIWidgets.flow {
public class LayerBuilder {
private ContainerLayer _rootLayer;
private ContainerLayer _currentLayer;
private readonly Stack<Rect> _cullRects = new Stack<Rect>();
public LayerBuilder() {
this._cullRects.Push(Rect.largest);
}
private void pushLayer(ContainerLayer layer, Rect cullRect) {
this._cullRects.Push(cullRect);
if (this._rootLayer == null) {
this._rootLayer = layer;
this._currentLayer = layer;
return;
}
if (this._currentLayer == null) {
return;
}
this._currentLayer.add(layer);
this._currentLayer = layer;
}
public Layer takeLayer() {
return this._rootLayer;
}
public void pop() {
if (this._currentLayer == null) {
return;
}
this._cullRects.Pop();
this._currentLayer = this._currentLayer.parent;
}
public void pushTransform(Matrix4x4 matrix) {
Rect cullRect = MatrixUtils.transformRect(matrix.inverse, this._cullRects.Peek());
var layer = new TransformLayer();
layer.transform = matrix;
this.pushLayer(layer, cullRect);
}
public void pushClipRect(Rect clipRect) {
Rect cullRect = clipRect.intersect(this._cullRects.Peek());
var layer = new ClipRectLayer();
layer.clipRect = clipRect;
this.pushLayer(layer, cullRect);
}
public void pushClipRRect(RRect clipRRect) {
Rect cullRect = clipRRect.outerRect.intersect(this._cullRects.Peek());
var layer = new ClipRRectLayer();
layer.clipRRect = clipRRect;
this.pushLayer(layer, cullRect);
}
public void pushOpacity(int alpha) {
var layer = new OpacityLayer();
layer.alpha = alpha;
this.pushLayer(layer, this._cullRects.Peek());
}
public void addPicture(Offset offset, Picture picture) {
if (this._currentLayer == null) {
return;
}
Rect pictureRect = picture.paintBounds;
pictureRect = pictureRect.shift(offset);
if (!pictureRect.overlaps(this._cullRects.Peek())) {
return;
}
var layer = new PictureLayer();
layer.offset = offset;
layer.picture = picture;
this._currentLayer.add(layer);
}
}
}