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85 行
3.1 KiB

using System;
using System.Collections.Generic;
using Unity.UIWidgets.gestures;
using Unity.UIWidgets.ui;
namespace Unity.UIWidgets.rendering {
public abstract class
RenderBoxContainerDefaultsMixinContainerRenderObjectMixinRenderBox<ChildType, ParentDataType>
: ContainerRenderObjectMixinRenderBox<ChildType, ParentDataType>
where ChildType : RenderBox
where ParentDataType : ContainerParentDataMixinBoxParentData<ChildType> {
public double? defaultComputeDistanceToFirstActualBaseline(TextBaseline baseline) {
var child = this.firstChild;
while (child != null) {
var childParentData = (ParentDataType) child.parentData;
double? result = child.getDistanceToActualBaseline(baseline);
if (result != null) {
return result.Value + childParentData.offset.dy;
}
child = childParentData.nextSibling;
}
return null;
}
public double? defaultComputeDistanceToHighestActualBaseline(TextBaseline baseline) {
double? result = null;
var child = this.firstChild;
while (child != null) {
var childParentData = (ParentDataType) child.parentData;
double? candidate = child.getDistanceToActualBaseline(baseline);
if (candidate != null) {
candidate += childParentData.offset.dy;
if (result != null) {
result = Math.Min(result.Value, candidate.Value);
}
else {
result = candidate;
}
}
child = childParentData.nextSibling;
}
return result;
}
public void defaultPaint(PaintingContext context, Offset offset) {
var child = this.firstChild;
while (child != null) {
var childParentData = (ParentDataType) child.parentData;
context.paintChild(child, childParentData.offset + offset);
child = childParentData.nextSibling;
}
}
public bool defaultHitTestChildren(HitTestResult result, Offset position) {
// the x, y parameters have the top left of the node's box as the origin
ChildType child = this.lastChild;
while (child != null) {
ParentDataType childParentData = (ParentDataType) child.parentData;
if (child.hitTest(result, position: position - childParentData.offset)) {
return true;
}
child = childParentData.previousSibling;
}
return false;
}
public List<ChildType> getChildrenAsList() {
var result = new List<ChildType>();
var child = this.firstChild;
while (child != null) {
var childParentData = (ParentDataType) child.parentData;
result.Add(child);
child = childParentData.nextSibling;
}
return result;
}
}
}