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157 行
4.9 KiB

using System;
using System.Collections.Generic;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.ui;
using TextStyle = Unity.UIWidgets.painting.TextStyle;
namespace Unity.UIWidgets.widgets {
class WidgetSpan : PlaceholderSpan,IEquatable<WidgetSpan> {
public WidgetSpan(
Widget child ,
TextBaseline baseline = TextBaseline.alphabetic,
TextStyle style = null,
PlaceholderAlignment alignment = PlaceholderAlignment.bottom
) : base(
alignment: alignment,
baseline: baseline,
style: style
) {
D.assert(child != null);
D.assert(baseline != null ||!(
(alignment == PlaceholderAlignment.aboveBaseline) ||
(alignment == PlaceholderAlignment.belowBaseline) ||
(alignment == PlaceholderAlignment.baseline)
));
this.child = child;
}
public readonly Widget child;
public override void build(
ParagraphBuilder builder,
float textScaleFactor = 1.0f,
List<PlaceholderDimensions> dimensions = null) {
D.assert(DebugAssertIsValid());
D.assert(dimensions != null);
bool hasStyle = style != null;
if (hasStyle) {
builder.pushStyle(style.getTextStyle(textScaleFactor: textScaleFactor));
}
D.assert(builder.placeholderCount < dimensions.Count);
PlaceholderDimensions currentDimensions = dimensions[builder.placeholderCount];
builder.addPlaceholder(
currentDimensions.size.width,
currentDimensions.size.height,
alignment,
scale: textScaleFactor,
baseline: currentDimensions.baseline,
baselineOffset: currentDimensions.baselineOffset
);
if (hasStyle) {
builder.pop();
}
}
public override bool visitChildren(InlineSpanVisitor visitor) {
return visitor(this);
}
protected override InlineSpan getSpanForPositionVisitor(TextPosition position, Accumulator offset) {
if (position.offset == offset.value) {
return this;
}
offset.increment(1);
return null;
}
protected override int? codeUnitAtVisitor(int index, Accumulator offset) {
return null;
}
public override RenderComparison compareTo(InlineSpan other) {
if (this == other)
return RenderComparison.identical;
if (style.GetType() != GetType())
return RenderComparison.layout;
if ((style == null) != (other.style == null))
return RenderComparison.layout;
WidgetSpan typedOther = other as WidgetSpan;
if (!child.Equals(typedOther.child) || alignment != typedOther.alignment) {
return RenderComparison.layout;
}
RenderComparison result = RenderComparison.identical;
if (style != null) {
RenderComparison candidate = style.compareTo(other.style);
if ((int) candidate > (int) result)
result = candidate;
if (result == RenderComparison.layout)
return result;
}
return result;
}
public override int GetHashCode() {
unchecked
{
return (base.GetHashCode() * 397) ^ (child != null ? child.GetHashCode() : 0);
}
}
public bool DebugAssertIsValid() {
return true;
}
public bool Equals(WidgetSpan other)
{
if (ReferenceEquals(null, other)) {
return false;
}
if (ReferenceEquals(this, other)) {
return true;
}
return base.Equals(other) && Equals(child, other.child);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) {
return false;
}
if (ReferenceEquals(this, obj)) {
return true;
}
if (obj.GetType() != GetType()) {
return false;
}
return Equals((WidgetSpan) obj);
}
public static bool operator ==(WidgetSpan left, WidgetSpan right) {
return Equals(left, right);
}
public static bool operator !=(WidgetSpan left, WidgetSpan right) {
return !Equals(left, right);
}
public override InlineSpan getSpanForPosition(TextPosition position) {
D.assert(debugAssertIsValid());
return null;
}
public override bool debugAssertIsValid() {
return true;
}
}
}