Introduce ParagraphBoundary subclass for text editing (#116549)
* attempt to extend to paragraph * second attempt * clean up implementation * clean up * updates * updates * Fix implementation * remove old * update docs * update docs * fix analyzer * Fix bug where new line character was selected and backwards selection failed * remove print * Add test for paragraph boundary * Add text editing test for extending selection to paragraph for mac and ios * rename to ExtendSelectionToParagraphBoundaryIntent * fix analyzer * Should default to downstream when collapsing selection * get rid of _getParagraphAtOffset and move into getTextBoundaryAt * Search for all line terminators * iterate through code units instead of characters * Address some reviewer comments" * Add separate implementations for leading and trailing paragraph boundary methods * Do not break after a carriage return if it is followed by a line feed * test carriage return followed by a line feed * more tests * Do not continue if the line terminator is at the target text offset * add hack to extend highlight to line terminator * Revert "add hack to extend highlight to line terminator" This reverts commit b4d3c434539b66c3c81c215e87c645b425902825. * Revert "Do not continue if the line terminator is at the target text offset" This reverts commit 789e1b838e54e7c25600bfa8852e59431ccaf5dc. * Update ParagraphBoundary with latest TextBoundary changes * Update implementation to iterate through indexes * update getTrailingTextBoundaryAt to include the line terminator * Updates * more updates * more updates * updates * updates * Lets try this again * clean up * updates * more updates * updates * fix * Re-implement using custom paragraph boundary applying method * Revert "Re-implement using custom paragraph boundary applying method" This reverts commit cd2f7f4b6eb6726b28f82a43708812e06a49df95. * Revert "fix" This reverts commit 8ec1f8f58935cfb3eb86dc6afd2894537af4cf7b. * updates * Revert "updates" This reverts commit 9dcca4a0031fe18ada9d6ffbbe77ba09918e82ae. * Revert "Revert "fix"" This reverts commit 9cc1332cd3041badc472d0d223a106203e46afb8. * Revert "Revert "Re-implement using custom paragraph boundary applying method"" This reverts commit 1acb606fb743fd840da20cca26d9a7c26accb71d. * Fix paragraph boundaries * Add failing test * Address some comments * group tests and fix analyzer * fix typo * fix remaining test * updates * more fixes and logs * clean up and add another test * Fix last test * Add new test * Clean up * more clean up * clean up comments * address comments * updates * return null when position is out of bounds and 0 or end of text if appropriate * Clean up cases * Do not return null when OOB in the direction of iteration * clean up * simplify implementation thanks to LongCatIsLooong feedback * Address comments * Add line and paragraph separator * Use _moveBeyondTextBoundary instead of custom _moveToParagraphBoundary * Change some intent names and revert fromPosition change * clean up docs --------- Co-authored-by: Renzo Olivares <roliv@google.com>
This commit is contained in:
Renzo Olivares
GitHub
parent
7477d7ac79
commit
6c12e39947
@ -123,9 +123,87 @@ class LineBoundary extends TextBoundary {
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TextRange getTextBoundaryAt(int position) => _textLayout.getLineAtOffset(TextPosition(offset: max(position, 0)));
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}
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/// A text boundary that uses paragraphs as logical boundaries.
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///
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/// A paragraph is defined as the range between line terminators. If no
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/// line terminators exist then the paragraph boundary is the entire document.
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class ParagraphBoundary extends TextBoundary {
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/// Creates a [ParagraphBoundary] with the text.
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const ParagraphBoundary(this._text);
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final String _text;
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/// Returns the [int] representing the start position of the paragraph that
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/// bounds the given `position`. The returned [int] is the position of the code unit
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/// that follows the line terminator that encloses the desired paragraph.
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@override
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int? getLeadingTextBoundaryAt(int position) {
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if (position < 0 || _text.isEmpty) {
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return null;
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}
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if (position >= _text.length) {
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return _text.length;
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}
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if (position == 0) {
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return 0;
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}
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final List<int> codeUnits = _text.codeUnits;
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int index = position;
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if (index > 1 && codeUnits[index] == 0xA && codeUnits[index - 1] == 0xD) {
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index -= 2;
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} else if (TextLayoutMetrics.isLineTerminator(codeUnits[index])) {
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index -= 1;
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}
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while (index > 0) {
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if (TextLayoutMetrics.isLineTerminator(codeUnits[index])) {
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return index + 1;
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}
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index -= 1;
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}
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return max(index, 0);
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}
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/// Returns the [int] representing the end position of the paragraph that
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/// bounds the given `position`. The returned [int] is the position of the
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/// code unit representing the trailing line terminator that encloses the
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/// desired paragraph.
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@override
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int? getTrailingTextBoundaryAt(int position) {
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if (position >= _text.length || _text.isEmpty) {
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return null;
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}
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if (position < 0) {
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return 0;
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}
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final List<int> codeUnits = _text.codeUnits;
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int index = position;
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while (!TextLayoutMetrics.isLineTerminator(codeUnits[index])) {
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index += 1;
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if (index == codeUnits.length) {
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return index;
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}
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}
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return index < codeUnits.length - 1
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&& codeUnits[index] == 0xD
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&& codeUnits[index + 1] == 0xA
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? index + 2
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: index + 1;
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}
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}
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/// A text boundary that uses the entire document as logical boundary.
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class DocumentBoundary extends TextBoundary {
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/// Creates a [DocumentBoundary] with the text
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/// Creates a [DocumentBoundary] with the text.
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const DocumentBoundary(this._text);
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final String _text;
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@ -54,6 +54,25 @@ abstract class TextLayoutMetrics {
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return true;
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}
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/// Check if the given code unit is a line terminator character.
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///
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/// Includes newline characters from ASCII
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/// (https://www.unicode.org/standard/reports/tr13/tr13-5.html).
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static bool isLineTerminator(int codeUnit) {
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switch (codeUnit) {
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case 0xA: // line feed
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case 0xB: // vertical feed
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case 0xC: // form feed
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case 0xD: // carriage return
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case 0x85: // new line
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case 0x2028: // line separator
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case 0x2029: // paragraph separator
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return true;
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default:
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return false;
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}
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}
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/// {@template flutter.services.TextLayoutMetrics.getLineAtOffset}
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/// Return a [TextSelection] containing the line of the given [TextPosition].
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/// {@endtemplate}
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@ -303,8 +303,8 @@ class DefaultTextEditingShortcuts extends StatelessWidget {
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const SingleActivator(LogicalKeyboardKey.arrowLeft, shift: true, alt: true): const ExtendSelectionToNextWordBoundaryOrCaretLocationIntent(forward: false),
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const SingleActivator(LogicalKeyboardKey.arrowRight, shift: true, alt: true): const ExtendSelectionToNextWordBoundaryOrCaretLocationIntent(forward: true),
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const SingleActivator(LogicalKeyboardKey.arrowUp, shift: true, alt: true): const ExtendSelectionVerticallyToAdjacentLineIntent(forward: false, collapseSelection: false),
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const SingleActivator(LogicalKeyboardKey.arrowDown, shift: true, alt: true): const ExtendSelectionVerticallyToAdjacentLineIntent(forward: true, collapseSelection: false),
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const SingleActivator(LogicalKeyboardKey.arrowUp, shift: true, alt: true): const ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent(forward: false),
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const SingleActivator(LogicalKeyboardKey.arrowDown, shift: true, alt: true): const ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent(forward: true),
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const SingleActivator(LogicalKeyboardKey.arrowLeft, meta: true): const ExtendSelectionToLineBreakIntent(forward: false, collapseSelection: true),
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const SingleActivator(LogicalKeyboardKey.arrowRight, meta: true): const ExtendSelectionToLineBreakIntent(forward: true, collapseSelection: true),
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@ -560,8 +560,8 @@ Intent? intentForMacOSSelector(String selectorName) {
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'moveWordLeftAndModifySelection:': ExtendSelectionToNextWordBoundaryOrCaretLocationIntent(forward: false),
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'moveWordRightAndModifySelection:': ExtendSelectionToNextWordBoundaryOrCaretLocationIntent(forward: true),
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'moveParagraphBackwardAndModifySelection:': ExtendSelectionToLineBreakIntent(forward: false, collapseSelection: false, collapseAtReversal: true),
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'moveParagraphForwardAndModifySelection:': ExtendSelectionToLineBreakIntent(forward: true, collapseSelection: false, collapseAtReversal: true),
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'moveParagraphBackwardAndModifySelection:': ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent(forward: false),
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'moveParagraphForwardAndModifySelection:': ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent(forward: true),
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'moveToLeftEndOfLine:': ExtendSelectionToLineBreakIntent(forward: false, collapseSelection: true),
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'moveToRightEndOfLine:': ExtendSelectionToLineBreakIntent(forward: true, collapseSelection: true),
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@ -3978,6 +3978,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
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TextBoundary _characterBoundary() => widget.obscureText ? _CodeUnitBoundary(_value.text) : CharacterBoundary(_value.text);
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TextBoundary _nextWordBoundary() => widget.obscureText ? _documentBoundary() : renderEditable.wordBoundaries.moveByWordBoundary;
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TextBoundary _linebreak() => widget.obscureText ? _documentBoundary() : LineBoundary(renderEditable);
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TextBoundary _paragraphBoundary() => ParagraphBoundary(_value.text);
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TextBoundary _documentBoundary() => DocumentBoundary(_value.text);
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Action<T> _makeOverridable<T extends Intent>(Action<T> defaultAction) {
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@ -4218,6 +4219,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
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ExtendSelectionToLineBreakIntent: _makeOverridable(_UpdateTextSelectionAction<ExtendSelectionToLineBreakIntent>(this, _linebreak, _moveToTextBoundary, ignoreNonCollapsedSelection: true)),
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ExtendSelectionVerticallyToAdjacentLineIntent: _makeOverridable(_verticalSelectionUpdateAction),
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ExtendSelectionVerticallyToAdjacentPageIntent: _makeOverridable(_verticalSelectionUpdateAction),
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ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent: _makeOverridable(_UpdateTextSelectionAction<ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent>(this, _paragraphBoundary, _moveBeyondTextBoundary, ignoreNonCollapsedSelection: true)),
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ExtendSelectionToDocumentBoundaryIntent: _makeOverridable(_UpdateTextSelectionAction<ExtendSelectionToDocumentBoundaryIntent>(this, _documentBoundary, _moveBeyondTextBoundary, ignoreNonCollapsedSelection: true)),
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ExtendSelectionToNextWordBoundaryOrCaretLocationIntent: _makeOverridable(_UpdateTextSelectionAction<ExtendSelectionToNextWordBoundaryOrCaretLocationIntent>(this, _nextWordBoundary, _moveBeyondTextBoundary, ignoreNonCollapsedSelection: true)),
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ScrollToDocumentBoundaryIntent: _makeOverridable(CallbackAction<ScrollToDocumentBoundaryIntent>(onInvoke: _scrollToDocumentBoundary)),
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@ -221,6 +221,21 @@ class ExtendSelectionVerticallyToAdjacentPageIntent extends DirectionalCaretMove
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}) : super(forward, collapseSelection);
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}
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/// Extends, or moves the current selection from the current
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/// [TextSelection.extent] position to the previous or the next paragraph
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/// boundary depending on the [forward] parameter.
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///
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/// This [Intent] collapses the selection when the order of [TextSelection.base]
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/// and [TextSelection.extent] would reverse.
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///
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/// This is typically only used on MacOS.
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class ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent extends DirectionalCaretMovementIntent {
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/// Creates an [ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent].
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const ExtendSelectionToNextParagraphBoundaryOrCaretLocationIntent({
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required bool forward,
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}) : super(forward, false, true);
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}
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/// Extends, or moves the current selection from the current
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/// [TextSelection.extent] position to the start or the end of the document.
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///
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@ -146,6 +146,113 @@ void main() {
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expect(boundary.getTextBoundaryAt(3), TestTextLayoutMetrics.lineAt3);
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});
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group('paragraph boundary', () {
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test('works for simple cases', () {
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const String textA= 'abcd efg hi\njklmno\npqrstuv';
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const ParagraphBoundary boundaryA = ParagraphBoundary(textA);
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// Position enclosed inside of paragraph, 'abcd efg h|i\n'.
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const int position = 10;
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// The range includes the line terminator.
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expect(boundaryA.getLeadingTextBoundaryAt(position), 0);
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expect(boundaryA.getTrailingTextBoundaryAt(position), 12);
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// This text includes a carriage return followed by a line feed.
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const String textB = 'abcd efg hi\r\njklmno\npqrstuv';
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const ParagraphBoundary boundaryB = ParagraphBoundary(textB);
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expect(boundaryB.getLeadingTextBoundaryAt(position), 0);
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expect(boundaryB.getTrailingTextBoundaryAt(position), 13);
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const String textF = 'Now is the time for\n' // 20
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'all good people\n' // 20 + 16 => 36
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'to come to the aid\n' // 36 + 19 => 55
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'of their country.'; // 55 + 17 => 72
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const ParagraphBoundary boundaryF = ParagraphBoundary(textF);
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const int positionF = 11;
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expect(boundaryF.getLeadingTextBoundaryAt(positionF), 0);
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expect(boundaryF.getTrailingTextBoundaryAt(positionF), 20);
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});
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test('works for consecutive line terminators involving CRLF', () {
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const String textI = 'Now is the time for\n' // 20
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'all good people\n\r\n' // 20 + 16 => 38
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'to come to the aid\n' // 38 + 19 => 57
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'of their country.'; // 57 + 17 => 74
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const ParagraphBoundary boundaryI = ParagraphBoundary(textI);
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const int positionI = 56;// \n at the end of the third line.
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const int positionJ = 38;// t at beginning of third line.
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const int positionK = 37;// \n at end of second line.
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expect(boundaryI.getLeadingTextBoundaryAt(positionI), 38);
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expect(boundaryI.getTrailingTextBoundaryAt(positionI), 57);
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expect(boundaryI.getLeadingTextBoundaryAt(positionJ), 38);
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expect(boundaryI.getTrailingTextBoundaryAt(positionJ), 57);
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expect(boundaryI.getLeadingTextBoundaryAt(positionK), 36);
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expect(boundaryI.getTrailingTextBoundaryAt(positionK), 38);
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});
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test('works for consecutive line terminators', () {
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const String textI = 'Now is the time for\n' // 20
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'all good people\n\n' // 20 + 16 => 37
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'to come to the aid\n' // 37 + 19 => 56
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'of their country.'; // 56 + 17 => 73
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const ParagraphBoundary boundaryI = ParagraphBoundary(textI);
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const int positionI = 55;// \n at the end of the third line.
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const int positionJ = 37;// t at beginning of third line.
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const int positionK = 36;// \n at end of second line.
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expect(boundaryI.getLeadingTextBoundaryAt(positionI), 37);
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expect(boundaryI.getTrailingTextBoundaryAt(positionI), 56);
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expect(boundaryI.getLeadingTextBoundaryAt(positionJ), 37);
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expect(boundaryI.getTrailingTextBoundaryAt(positionJ), 56);
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expect(boundaryI.getLeadingTextBoundaryAt(positionK), 36);
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expect(boundaryI.getTrailingTextBoundaryAt(positionK), 37);
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});
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test('leading boundary works for consecutive CRLF', () {
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// This text includes multiple consecutive carriage returns followed by line feeds (CRLF).
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const String textH = 'abcd efg hi\r\n\r\n\r\n\r\n\r\n\r\n\r\n\n\n\n\n\njklmno\npqrstuv';
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const ParagraphBoundary boundaryH = ParagraphBoundary(textH);
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const int positionH = 18;
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expect(boundaryH.getLeadingTextBoundaryAt(positionH), 17);
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expect(boundaryH.getTrailingTextBoundaryAt(positionH), 19);
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});
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test('trailing boundary works for consecutive CRLF', () {
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// This text includes multiple consecutive carriage returns followed by line feeds (CRLF).
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const String textG = 'abcd efg hi\r\n\n\n\n\n\n\r\n\r\n\r\n\r\n\n\n\n\n\njklmno\npqrstuv';
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const ParagraphBoundary boundaryG = ParagraphBoundary(textG);
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const int positionG = 18;
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expect(boundaryG.getLeadingTextBoundaryAt(positionG), 18);
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expect(boundaryG.getTrailingTextBoundaryAt(positionG), 20);
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});
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test('works when position is between two CRLF', () {
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const String textE = 'abcd efg hi\r\nhello\r\n\n';
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const ParagraphBoundary boundaryE = ParagraphBoundary(textE);
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// Position enclosed inside of paragraph, 'abcd efg hi\r\nhello\r\n\n'.
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const int positionE = 16;
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expect(boundaryE.getLeadingTextBoundaryAt(positionE), 13);
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expect(boundaryE.getTrailingTextBoundaryAt(positionE), 20);
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});
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test('works for multiple consecutive line terminators', () {
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// This text includes multiple consecutive line terminators.
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const String textC = 'abcd efg hi\r\n\n\n\n\n\n\n\n\n\n\n\njklmno\npqrstuv';
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const ParagraphBoundary boundaryC = ParagraphBoundary(textC);
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// Position enclosed inside of paragraph, 'abcd efg hi\r\n\n\n\n\n\n|\n\n\n\n\n\njklmno\npqrstuv'.
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const int positionC = 18;
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expect(boundaryC.getLeadingTextBoundaryAt(positionC), 18);
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expect(boundaryC.getTrailingTextBoundaryAt(positionC), 19);
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const String textD = 'abcd efg hi\r\n\n\n\n';
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const ParagraphBoundary boundaryD = ParagraphBoundary(textD);
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// Position enclosed inside of paragraph, 'abcd efg hi\r\n\n|\n\n'.
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const int positionD = 14;
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expect(boundaryD.getLeadingTextBoundaryAt(positionD), 14);
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expect(boundaryD.getTrailingTextBoundaryAt(positionD), 15);
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});
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});
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test('document boundary works', () {
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const String text = 'abcd efg hi\njklmno\npqrstuv';
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const DocumentBoundary boundary = DocumentBoundary(text);
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@ -6365,6 +6365,161 @@ void main() {
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);
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expect(controller.text, equals(testText), reason: 'on $platform');
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final bool platformCanSelectByParagraph = defaultTargetPlatform == TargetPlatform.iOS || defaultTargetPlatform == TargetPlatform.macOS;
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// Move down one paragraph.
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await sendKeys(
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tester,
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<LogicalKeyboardKey>[
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LogicalKeyboardKey.arrowDown,
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],
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shift: true,
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wordModifier: true,
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targetPlatform: defaultTargetPlatform,
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);
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expect(
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selection,
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equals(
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TextSelection(
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baseOffset: 10,
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extentOffset: platformCanSelectByParagraph ? 20 : 10,
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),
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),
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reason: 'on $platform',
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);
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// Move down another paragraph.
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await sendKeys(
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tester,
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<LogicalKeyboardKey>[
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LogicalKeyboardKey.arrowDown,
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],
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shift: true,
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wordModifier: true,
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targetPlatform: defaultTargetPlatform,
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);
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expect(
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selection,
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equals(
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TextSelection(
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baseOffset: 10,
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extentOffset: platformCanSelectByParagraph ? 36 : 10,
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),
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),
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reason: 'on $platform',
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);
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// Move down another paragraph.
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await sendKeys(
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tester,
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<LogicalKeyboardKey>[
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LogicalKeyboardKey.arrowDown,
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],
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shift: true,
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wordModifier: true,
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targetPlatform: defaultTargetPlatform,
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);
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expect(
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selection,
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equals(
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TextSelection(
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baseOffset: 10,
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extentOffset: platformCanSelectByParagraph ? 55 : 10,
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),
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),
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reason: 'on $platform',
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);
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// Move up a paragraph.
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await sendKeys(
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tester,
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<LogicalKeyboardKey>[
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LogicalKeyboardKey.arrowUp,
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],
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shift: true,
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wordModifier: true,
|
||||
targetPlatform: defaultTargetPlatform,
|
||||
);
|
||||
|
||||
expect(
|
||||
selection,
|
||||
equals(
|
||||
TextSelection(
|
||||
baseOffset: 10,
|
||||
extentOffset: platformCanSelectByParagraph ? 36 : 10,
|
||||
),
|
||||
),
|
||||
reason: 'on $platform',
|
||||
);
|
||||
|
||||
// Move up a paragraph.
|
||||
await sendKeys(
|
||||
tester,
|
||||
<LogicalKeyboardKey>[
|
||||
LogicalKeyboardKey.arrowUp,
|
||||
],
|
||||
shift: true,
|
||||
wordModifier: true,
|
||||
targetPlatform: defaultTargetPlatform,
|
||||
);
|
||||
|
||||
expect(
|
||||
selection,
|
||||
equals(
|
||||
TextSelection(
|
||||
baseOffset: 10,
|
||||
extentOffset: platformCanSelectByParagraph ? 20 : 10,
|
||||
),
|
||||
),
|
||||
reason: 'on $platform',
|
||||
);
|
||||
|
||||
// Move up back to the origin.
|
||||
await sendKeys(
|
||||
tester,
|
||||
<LogicalKeyboardKey>[
|
||||
LogicalKeyboardKey.arrowUp,
|
||||
],
|
||||
shift: true,
|
||||
wordModifier: true,
|
||||
targetPlatform: defaultTargetPlatform,
|
||||
);
|
||||
|
||||
expect(
|
||||
selection,
|
||||
equals(
|
||||
TextSelection(
|
||||
baseOffset: 10,
|
||||
extentOffset: platformCanSelectByParagraph ? 10 : 10,
|
||||
),
|
||||
),
|
||||
reason: 'on $platform',
|
||||
);
|
||||
|
||||
// Move up, extending the selection backwards to the next paragraph.
|
||||
await sendKeys(
|
||||
tester,
|
||||
<LogicalKeyboardKey>[
|
||||
LogicalKeyboardKey.arrowUp,
|
||||
],
|
||||
shift: true,
|
||||
wordModifier: true,
|
||||
targetPlatform: defaultTargetPlatform,
|
||||
);
|
||||
|
||||
expect(
|
||||
selection,
|
||||
equals(
|
||||
TextSelection(
|
||||
baseOffset: 10,
|
||||
extentOffset: platformCanSelectByParagraph ? 0 : 10,
|
||||
),
|
||||
),
|
||||
reason: 'on $platform',
|
||||
);
|
||||
|
||||
// Copy All
|
||||
await sendKeys(
|
||||
tester,
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user