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Avoid use of ParagraphConstrains const ctor (#26392)

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Usages of ParagraphConstraints (from dart:ui) whose constructor could be
const as of flutter/engine#7346 are currently marked //
ignore:prefer_const_constructors in the framework until all
Google-internal embedders have been updated to an engine version that
includes the above change. These were initially updated in engine roll
flutter/flutter#26252, but broke internal embedders.

We should re-enable use of the const constructor in those cases once
internal embedders are updated.

See: https://github.com/flutter/flutter/issues/26390
This commit is contained in:
Chris Bracken 2019-01-10 17:25:24 -08:00 committed by GitHub
parent 585e23173a
commit 88b77a7d0f
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4 changed files with 12 additions and 4 deletions
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4
examples/layers/raw/text.dart
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@ -84,7 +84,9 @@ void main() {
// Next, we supply a width that the text is permitted to occupy and we ask
// the paragraph to the visual position of each its glyphs as well as its
// overall size, subject to its sizing constraints.
..layout(const ui.ParagraphConstraints(width: 180.0));
// TODO(cbracken): use const constructor. https://github.com/flutter/flutter/issues/26390
// ignore:prefer_const_constructors
..layout(ui.ParagraphConstraints(width: 180.0));
// Finally, we register our beginFrame callback and kick off the first frame.
ui.window.onBeginFrame = beginFrame;

4
packages/flutter/lib/src/painting/text_painter.dart
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@ -242,7 +242,9 @@ class TextPainter {
builder.pushStyle(text.style.getTextStyle(textScaleFactor: textScaleFactor));
builder.addText(' ');
_layoutTemplate = builder.build()
..layout(const ui.ParagraphConstraints(width: double.infinity));
// TODO(cbracken): use const constructor. https://github.com/flutter/flutter/issues/26390
// ignore:prefer_const_constructors
..layout(ui.ParagraphConstraints(width: double.infinity));
}
return _layoutTemplate.height;
}

4
packages/flutter/test/engine/paragraph_builder_test.dart
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@ -13,7 +13,9 @@ void main() {
final Paragraph paragraph = builder.build();
expect(paragraph, isNotNull);
paragraph.layout(const ParagraphConstraints(width: 800.0));
// TODO(cbracken): use const constructor. https://github.com/flutter/flutter/issues/26390
// ignore:prefer_const_constructors
paragraph.layout(ParagraphConstraints(width: 800.0));
expect(paragraph.width, isNonZero);
expect(paragraph.height, isNonZero);
});

4
packages/flutter/test/engine/paragraph_test.dart
View File

@ -20,7 +20,9 @@ void main() {
));
builder.addText('Test');
final Paragraph paragraph = builder.build();
paragraph.layout(const ParagraphConstraints(width: 400.0));
// TODO(cbracken): use const constructor. https://github.com/flutter/flutter/issues/26390
// ignore:prefer_const_constructors
paragraph.layout(ParagraphConstraints(width: 400.0));
expect(paragraph.height, closeTo(fontSize, 0.001));
expect(paragraph.width, closeTo(400.0, 0.001));