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Fixed Selectable text align is broken (#40709)

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* Fixed Selectable text align is broken
This commit is contained in:
chunhtai 2019-09-19 09:37:00 -07:00 committed by GitHub
parent f8ba6756c3
commit 0086243be4
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 54 additions and 45 deletions
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76
packages/flutter/lib/src/rendering/editable.dart
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@ -242,7 +242,8 @@ class RenderEditable extends RenderBox {
/// Called when the selection changes.
SelectionChangedHandler onSelectionChanged;
double _textLayoutLastWidth;
double _textLayoutLastMaxWidth;
double _textLayoutLastMinWidth;
/// Called during the paint phase when the caret location changes.
CaretChangedHandler onCaretChanged;
@ -628,7 +629,8 @@ class RenderEditable extends RenderBox {
/// Implies [markNeedsLayout].
@protected
void markNeedsTextLayout() {
_textLayoutLastWidth = null;
_textLayoutLastMaxWidth = null;
_textLayoutLastMinWidth = null;
markNeedsLayout();
}
@ -1250,7 +1252,7 @@ class RenderEditable extends RenderBox {
/// a [TextPosition] rather than a [TextSelection].
List<TextSelectionPoint> getEndpointsForSelection(TextSelection selection) {
assert(constraints != null);
_layoutText(constraints.maxWidth);
_layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
final Offset paintOffset = _paintOffset;
@ -1279,7 +1281,7 @@ class RenderEditable extends RenderBox {
/// * [TextPainter.getPositionForOffset], which is the equivalent method
/// for a [TextPainter] object.
TextPosition getPositionForPoint(Offset globalPosition) {
_layoutText(constraints.maxWidth);
_layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
globalPosition += -_paintOffset;
return _textPainter.getPositionForOffset(globalToLocal(globalPosition));
}
@ -1296,7 +1298,7 @@ class RenderEditable extends RenderBox {
/// * [TextPainter.getOffsetForCaret], the equivalent method for a
/// [TextPainter] object.
Rect getLocalRectForCaret(TextPosition caretPosition) {
_layoutText(constraints.maxWidth);
_layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
final Offset caretOffset = _textPainter.getOffsetForCaret(caretPosition, _caretPrototype);
// This rect is the same as _caretPrototype but without the vertical padding.
Rect rect = Rect.fromLTWH(0.0, 0.0, cursorWidth, preferredLineHeight).shift(caretOffset + _paintOffset);
@ -1309,13 +1311,13 @@ class RenderEditable extends RenderBox {
@override
double computeMinIntrinsicWidth(double height) {
_layoutText(double.infinity);
_layoutText(maxWidth: double.infinity);
return _textPainter.minIntrinsicWidth;
}
@override
double computeMaxIntrinsicWidth(double height) {
_layoutText(double.infinity);
_layoutText(maxWidth: double.infinity);
return _textPainter.maxIntrinsicWidth + cursorWidth;
}
@ -1336,7 +1338,7 @@ class RenderEditable extends RenderBox {
final bool minLimited = minLines != null && minLines > 1;
final bool maxLimited = maxLines != null;
if (minLimited || maxLimited) {
_layoutText(width);
_layoutText(maxWidth: width);
if (minLimited && _textPainter.height < preferredLineHeight * minLines) {
return preferredLineHeight * minLines;
}
@ -1355,7 +1357,7 @@ class RenderEditable extends RenderBox {
}
return preferredLineHeight * lines;
}
_layoutText(width);
_layoutText(maxWidth: width);
return math.max(preferredLineHeight, _textPainter.height);
}
@ -1371,7 +1373,7 @@ class RenderEditable extends RenderBox {
@override
double computeDistanceToActualBaseline(TextBaseline baseline) {
_layoutText(constraints.maxWidth);
_layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
return _textPainter.computeDistanceToActualBaseline(baseline);
}
@ -1464,7 +1466,7 @@ class RenderEditable extends RenderBox {
void selectPositionAt({ @required Offset from, Offset to, @required SelectionChangedCause cause }) {
assert(cause != null);
assert(from != null);
_layoutText(constraints.maxWidth);
_layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
if (onSelectionChanged != null) {
final TextPosition fromPosition = _textPainter.getPositionForOffset(globalToLocal(from - _paintOffset));
final TextPosition toPosition = to == null
@ -1506,7 +1508,7 @@ class RenderEditable extends RenderBox {
void selectWordsInRange({ @required Offset from, Offset to, @required SelectionChangedCause cause }) {
assert(cause != null);
assert(from != null);
_layoutText(constraints.maxWidth);
_layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
if (onSelectionChanged != null) {
final TextPosition firstPosition = _textPainter.getPositionForOffset(globalToLocal(from - _paintOffset));
final TextSelection firstWord = _selectWordAtOffset(firstPosition);
@ -1529,7 +1531,7 @@ class RenderEditable extends RenderBox {
/// {@macro flutter.rendering.editable.select}
void selectWordEdge({ @required SelectionChangedCause cause }) {
assert(cause != null);
_layoutText(constraints.maxWidth);
_layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
assert(_lastTapDownPosition != null);
if (onSelectionChanged != null) {
final TextPosition position = _textPainter.getPositionForOffset(globalToLocal(_lastTapDownPosition - _paintOffset));
@ -1549,8 +1551,9 @@ class RenderEditable extends RenderBox {
}
TextSelection _selectWordAtOffset(TextPosition position) {
assert(_textLayoutLastWidth == constraints.maxWidth,
'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
assert(_textLayoutLastMaxWidth == constraints.maxWidth &&
_textLayoutLastMinWidth == constraints.minWidth,
'Last width ($_textLayoutLastMinWidth, $_textLayoutLastMaxWidth) not the same as max width constraint (${constraints.minWidth}, ${constraints.maxWidth}).');
final TextRange word = _textPainter.getWordBoundary(position);
// When long-pressing past the end of the text, we want a collapsed cursor.
if (position.offset >= word.end)
@ -1564,17 +1567,20 @@ class RenderEditable extends RenderBox {
Rect _caretPrototype;
void _layoutText(double constraintWidth) {
assert(constraintWidth != null);
if (_textLayoutLastWidth == constraintWidth)
void _layoutText({ double minWidth = 0.0, double maxWidth = double.infinity }) {
assert(maxWidth != null && minWidth != null);
if (_textLayoutLastMaxWidth == maxWidth && _textLayoutLastMinWidth == minWidth)
return;
final double availableWidth = math.max(0.0, constraintWidth - _caretMargin);
final double maxWidth = _isMultiline ? availableWidth : double.infinity;
final double availableMaxWidth = math.max(0.0, maxWidth - _caretMargin);
final double availableMinWidth = math.min(minWidth, availableMaxWidth);
final double textMaxWidth = _isMultiline ? availableMaxWidth : double.infinity;
final double textMinWidth = forceLine ? availableMaxWidth : availableMinWidth;
_textPainter.layout(
minWidth: forceLine ? availableWidth : 0,
maxWidth: maxWidth,
minWidth: textMinWidth,
maxWidth: textMaxWidth,
);
_textLayoutLastWidth = constraintWidth;
_textLayoutLastMinWidth = minWidth;
_textLayoutLastMaxWidth = maxWidth;
}
// TODO(garyq): This is no longer producing the highest-fidelity caret
@ -1601,7 +1607,7 @@ class RenderEditable extends RenderBox {
}
@override
void performLayout() {
_layoutText(constraints.maxWidth);
_layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
_caretPrototype = _getCaretPrototype;
_selectionRects = null;
// We grab _textPainter.size here because assigning to `size` on the next
@ -1633,8 +1639,9 @@ class RenderEditable extends RenderBox {
}
void _paintCaret(Canvas canvas, Offset effectiveOffset, TextPosition textPosition) {
assert(_textLayoutLastWidth == constraints.maxWidth,
'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
assert(_textLayoutLastMaxWidth == constraints.maxWidth &&
_textLayoutLastMinWidth == constraints.minWidth,
'Last width ($_textLayoutLastMinWidth, $_textLayoutLastMaxWidth) not the same as max width constraint (${constraints.minWidth}, ${constraints.maxWidth}).');
// If the floating cursor is enabled, the text cursor's color is [backgroundCursorColor] while
// the floating cursor's color is _cursorColor;
@ -1713,8 +1720,9 @@ class RenderEditable extends RenderBox {
}
void _paintFloatingCaret(Canvas canvas, Offset effectiveOffset) {
assert(_textLayoutLastWidth == constraints.maxWidth,
'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
assert(_textLayoutLastMaxWidth == constraints.maxWidth &&
_textLayoutLastMinWidth == constraints.minWidth,
'Last width ($_textLayoutLastMinWidth, $_textLayoutLastMaxWidth) not the same as max width constraint (${constraints.minWidth}, ${constraints.maxWidth}).');
assert(_floatingCursorOn);
// We always want the floating cursor to render at full opacity.
@ -1801,8 +1809,9 @@ class RenderEditable extends RenderBox {
}
void _paintSelection(Canvas canvas, Offset effectiveOffset) {
assert(_textLayoutLastWidth == constraints.maxWidth,
'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
assert(_textLayoutLastMaxWidth == constraints.maxWidth &&
_textLayoutLastMinWidth == constraints.minWidth,
'Last width ($_textLayoutLastMinWidth, $_textLayoutLastMaxWidth) not the same as max width constraint (${constraints.minWidth}, ${constraints.maxWidth}).');
assert(_selectionRects != null);
final Paint paint = Paint()..color = _selectionColor;
for (ui.TextBox box in _selectionRects)
@ -1810,8 +1819,9 @@ class RenderEditable extends RenderBox {
}
void _paintContents(PaintingContext context, Offset offset) {
assert(_textLayoutLastWidth == constraints.maxWidth,
'Last width ($_textLayoutLastWidth) not the same as max width constraint (${constraints.maxWidth}).');
assert(_textLayoutLastMaxWidth == constraints.maxWidth &&
_textLayoutLastMinWidth == constraints.minWidth,
'Last width ($_textLayoutLastMinWidth, $_textLayoutLastMaxWidth) not the same as max width constraint (${constraints.minWidth}, ${constraints.maxWidth}).');
final Offset effectiveOffset = offset + _paintOffset;
bool showSelection = false;
@ -1874,7 +1884,7 @@ class RenderEditable extends RenderBox {
}
@override
void paint(PaintingContext context, Offset offset) {
_layoutText(constraints.maxWidth);
_layoutText(minWidth: constraints.minWidth, maxWidth: constraints.maxWidth);
if (_hasVisualOverflow)
context.pushClipRect(needsCompositing, offset, Offset.zero & size, _paintContents);
else

23
packages/flutter/test/widgets/selectable_text_test.dart
View file

@ -1159,7 +1159,7 @@ void main() {
editable.getLocalRectForCaret(const TextPosition(offset: 2)).topLeft,
);
expect(topLeft.dx, equals(278.0));
expect(topLeft.dx, equals(399.0));
});
testWidgets('Can align to center within center', (WidgetTester tester) async {
@ -3477,22 +3477,22 @@ void main() {
Offset topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 4)).topLeft,
);
expect(topLeft.dx, equals(306));
expect(topLeft.dx, equals(427));
topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 3)).topLeft,
);
expect(topLeft.dx, equals(292));
expect(topLeft.dx, equals(413));
topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 2)).topLeft,
);
expect(topLeft.dx, equals(278));
expect(topLeft.dx, equals(399));
topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 1)).topLeft,
);
expect(topLeft.dx, equals(264));
expect(topLeft.dx, equals(385));
});
testWidgets('Caret indexes into trailing whitespace center align', (WidgetTester tester) async {
@ -3513,33 +3513,32 @@ void main() {
Offset topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 7)).topLeft,
);
expect(topLeft.dx, equals(362));
expect(topLeft.dx, equals(469));
topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 8)).topLeft,
);
// Caret is capped at text length.
expect(topLeft.dx, equals(362));
expect(topLeft.dx, equals(483));
topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 4)).topLeft,
);
expect(topLeft.dx, equals(334));
expect(topLeft.dx, equals(427));
topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 3)).topLeft,
);
expect(topLeft.dx, equals(320));
expect(topLeft.dx, equals(413));
topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 2)).topLeft,
);
expect(topLeft.dx, equals(306));
expect(topLeft.dx, equals(399));
topLeft = editable.localToGlobal(
editable.getLocalRectForCaret(const TextPosition(offset: 1)).topLeft,
);
expect(topLeft.dx, equals(292));
expect(topLeft.dx, equals(385));
});
testWidgets('selection handles are rendered and not faded away', (WidgetTester tester) async {