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93 行
3.9 KiB

using System;
using System.Text.RegularExpressions;
using Unity.UIWidgets.foundation;
namespace Unity.UIWidgets.service {
public abstract class TextInputFormatter {
public delegate TextEditingValue TextInputFormatFunction(TextEditingValue oldValue,
TextEditingValue newValue);
public abstract TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue);
static TextInputFormatter withFunction(TextInputFormatFunction formatFunction) {
return new _SimpleTextInputFormatter(formatFunction);
}
}
class _SimpleTextInputFormatter : TextInputFormatter {
public readonly TextInputFormatFunction formatFunction;
internal _SimpleTextInputFormatter(TextInputFormatFunction formatFunction) {
D.assert(formatFunction != null);
this.formatFunction = formatFunction;
}
public override TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
return this.formatFunction(oldValue, newValue);
}
}
public class BlacklistingTextInputFormatter : TextInputFormatter {
public readonly Regex blacklistedPattern;
public readonly string replacementString;
public static readonly BlacklistingTextInputFormatter singleLineFormatter
= new BlacklistingTextInputFormatter(new Regex(@"\n"));
public BlacklistingTextInputFormatter(Regex blacklistedPattern, string replacementString = "") {
D.assert(blacklistedPattern != null);
this.blacklistedPattern = blacklistedPattern;
this.replacementString = replacementString;
}
public override TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
return Util._selectionAwareTextManipulation(newValue,
(substring) => this.blacklistedPattern.Replace(substring, this.replacementString));
}
}
static class Util {
internal static TextEditingValue _selectionAwareTextManipulation(TextEditingValue value,
Func<string, string> substringManipulation) {
int selectionStartIndex = value.selection.start;
int selectionEndIndex = value.selection.end;
string manipulatedText;
TextSelection manipulatedSelection = null;
if (selectionStartIndex < 0 || selectionEndIndex < 0) {
manipulatedText = substringManipulation(value.text);
}
else {
var beforeSelection = substringManipulation(
value.text.Substring(0, selectionStartIndex)
);
var inSelection = substringManipulation(
value.text.Substring(selectionStartIndex, selectionEndIndex - selectionStartIndex)
);
var afterSelection = substringManipulation(
value.text.Substring(selectionEndIndex)
);
manipulatedText = beforeSelection + inSelection + afterSelection;
if (value.selection.baseOffset > value.selection.extentOffset) {
manipulatedSelection = value.selection.copyWith(
baseOffset: beforeSelection.Length + inSelection.Length,
extentOffset: beforeSelection.Length
);
}
else {
manipulatedSelection = value.selection.copyWith(
baseOffset: beforeSelection.Length,
extentOffset: beforeSelection.Length + inSelection.Length
);
}
}
return new TextEditingValue(
text: manipulatedText,
selection: manipulatedSelection ?? TextSelection.collapsed(offset: -1),
composing: manipulatedText == value.text ? value.composing : TextRange.empty
);
}
}
}