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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| import 'package:flutter/material.dart'; | ||
|
|
||
| class MultilineController { | ||
| List<int> carets = []; | ||
| late int currentSelection = 0; | ||
| bool isCaret = false; | ||
| bool isMutli = false; | ||
|
|
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| MultilineController() : super(); | ||
|
|
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| TextEditingValue updateMultiline( | ||
| TextEditingValue value, TextEditingValue newValue) { | ||
| bool isDeleting = newValue.text.length < value.text.length; | ||
| bool isInserting = newValue.text.length > value.text.length; | ||
| if (this.isMutli) { | ||
| if (isDeleting || (isInserting && !isCaret)) { | ||
| int diff = newValue.text.length - value.text.length; | ||
| String newText = newValue.text; | ||
| int start = newValue.selection.start - diff; | ||
|
|
||
| String insertedValue = | ||
| diff > 0 ? newText.substring(start, start + diff) : ""; | ||
|
|
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| for (int i = 0; i < carets.length; i++) { | ||
| if (carets[i] >= currentSelection) { | ||
| carets[i] += diff; | ||
| } | ||
| } | ||
|
|
||
| carets.sort(); | ||
|
|
||
| for (int i = 0; i < carets.length; i++) { | ||
| newText = newText.replaceRange( | ||
| carets[i] - (diff > 0 ? 0 : 1), carets[i], insertedValue); | ||
|
|
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| carets[i] += diff; | ||
|
|
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| if (isDeleting) { | ||
| bool isThisCaretCollide = carets.any((caret) => | ||
| (carets[i] == caret && i != carets.indexOf(caret))) || | ||
| carets[i] == newValue.selection.start || | ||
| carets[i] == newValue.selection.start - 1; | ||
|
|
||
| if (isThisCaretCollide) { | ||
| newText = newText.replaceRange(carets[i] - 2, carets[i] - 1, ""); | ||
| carets[i] = -1; | ||
| } | ||
| } | ||
|
|
||
| if (i + 1 != carets.length) { | ||
| carets[i + 1] += diff * (i + 1); | ||
| } | ||
| } | ||
|
|
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| carets = carets.where((i) => i != -1).toList(); | ||
|
|
||
| int newOffSet = | ||
| carets.where((pos) => pos <= currentSelection).length * diff; | ||
|
|
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| newValue = newValue.copyWith( | ||
| selection: newValue.selection.copyWith( | ||
| baseOffset: newValue.selection.start + newOffSet, | ||
| extentOffset: newValue.selection.start + newOffSet), | ||
| text: newText.toString()); | ||
| } | ||
| this.isCaret = false; | ||
| } | ||
| return newValue; | ||
| } | ||
|
|
||
| TextEditingValue clearCarets(TextEditingValue value) { | ||
| if (carets.isEmpty) { | ||
| return value; | ||
| } | ||
|
|
||
| this.isMutli = false; | ||
| String clearedText = value.text; | ||
| carets.sort(); | ||
|
|
||
| for (int i = 0; i < carets.length; i++) { | ||
| clearedText = clearedText.replaceRange(carets[i], carets[i] + 1, ""); | ||
| if (i + 1 != carets.length) { | ||
| carets[i + 1] -= i + 1; | ||
| } | ||
| } | ||
|
|
||
| value = value.copyWith( | ||
| text: clearedText, | ||
| selection: value.selection.copyWith( | ||
| baseOffset: value.selection.start - carets.length, | ||
| extentOffset: value.selection.start - carets.length)); | ||
| carets.clear(); | ||
|
|
||
| return value; | ||
| } | ||
|
|
||
| TextEditingValue insertCaret(TextEditingValue value) { | ||
| final sel = value.selection; | ||
| if (this.carets.contains(sel.start) || | ||
| this.carets.contains(sel.start - 1) || | ||
| value.selection.start == currentSelection) { | ||
| return value; | ||
| } | ||
|
|
||
| if (value.text.length == 0) { | ||
| currentSelection = 0; | ||
| } | ||
|
|
||
| int isAbove = currentSelection < value.selection.start ? 1 : 0; | ||
|
|
||
| for (int i = 0; i < carets.length; i++) { | ||
| if (carets[i] >= currentSelection) { | ||
| carets[i] += 1; | ||
| } | ||
| } | ||
|
|
||
| carets.add(currentSelection); | ||
|
|
||
| value = value.copyWith( | ||
| text: value.text.replaceRange(currentSelection, currentSelection, "|"), | ||
| selection: sel.copyWith( | ||
| baseOffset: sel.start + isAbove, | ||
| extentOffset: sel.start + isAbove, | ||
| )); | ||
| currentSelection = value.selection.start; | ||
|
|
||
| return value; | ||
| } | ||
|
|
||
| void updateCurrentSelection(int newSelection, int selection) { | ||
| if (newSelection != selection || currentSelection == -1) { | ||
| currentSelection = selection; | ||
| } | ||
| } | ||
| } |