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106 行
3.7 KiB

using System;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.ui;
namespace Unity.UIWidgets.service {
public class TextSelection : TextRange, IEquatable<TextSelection> {
public readonly int baseOffset;
public readonly int extentOffset;
public readonly TextAffinity affinity;
public readonly bool isDirectional;
public TextSelection(int baseOffset, int extentOffset, TextAffinity affinity = TextAffinity.downstream,
bool isDirectional = false) : base(baseOffset < extentOffset ? baseOffset : extentOffset,
baseOffset < extentOffset ? extentOffset : baseOffset) {
this.baseOffset = baseOffset;
this.extentOffset = extentOffset;
this.affinity = affinity;
this.isDirectional = isDirectional;
}
public static TextSelection collapsed(int offset, TextAffinity affinity = TextAffinity.downstream) {
return new TextSelection(offset, offset, affinity, false);
}
public static TextSelection fromPosition(TextPosition position) {
return collapsed(position.offset, position.affinity);
}
public TextPosition basePos {
get { return new TextPosition(offset: baseOffset, affinity: affinity); }
}
public TextPosition extendPos {
get { return new TextPosition(offset: extentOffset, affinity: affinity); }
}
public TextPosition startPos {
get { return new TextPosition(offset: start, affinity: affinity); }
}
public TextPosition endPos {
get { return new TextPosition(offset: end, affinity: affinity); }
}
public bool Equals(TextSelection other) {
if (ReferenceEquals(null, other)) {
return false;
}
if (ReferenceEquals(this, other)) {
return true;
}
return baseOffset == other.baseOffset && extentOffset == other.extentOffset &&
affinity == other.affinity && isDirectional == other.isDirectional;
}
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((TextSelection) obj);
}
public override int GetHashCode() {
unchecked {
var hashCode = base.GetHashCode();
hashCode = (hashCode * 397) ^ baseOffset;
hashCode = (hashCode * 397) ^ extentOffset;
hashCode = (hashCode * 397) ^ (int) affinity;
hashCode = (hashCode * 397) ^ isDirectional.GetHashCode();
return hashCode;
}
}
public static bool operator ==(TextSelection left, TextSelection right) {
return Equals(left, right);
}
public static bool operator !=(TextSelection left, TextSelection right) {
return !Equals(left, right);
}
public TextSelection copyWith(int? baseOffset = null, int? extentOffset = null, TextAffinity? affinity = null,
bool? isDirectional = null) {
return new TextSelection(
baseOffset ?? this.baseOffset, extentOffset ?? this.extentOffset, affinity ?? this.affinity,
isDirectional ?? this.isDirectional
);
}
public override string ToString() {
return
$"{base.ToString()}, BaseOffset: {baseOffset}, ExtentOffset: {extentOffset}, Affinity: {affinity}, IsDirectional: {isDirectional}";
}
}
}