refactor: [GRWT-8756] Enhance Y-axis grid label and line painters with additional parameters for optimized rendering #458
Conversation
… parameters for optimized rendering
Reviewer's GuideRefactors the Y-axis grid label and line painters to accept additional layout-related parameters and implements more granular shouldRepaint logic so the chart only repaints when relevant inputs change. Class diagram for updated Y-axis grid painters and BasicChart integrationclassDiagram
class BasicChartState {
+double _topBoundQuote
+double _bottomBoundQuote
+double _topPadding
+double _bottomPadding
}
class YGridLinePainter {
+List<double> gridLineQuotes
+double labelWidth
+GridStyle style
+double topBoundQuote
+double bottomBoundQuote
+double topPadding
+double bottomPadding
+paint(Canvas canvas, Size size)
+shouldRepaint(YGridLinePainter oldDelegate) bool
+shouldRebuildSemantics(YGridLinePainter oldDelegate) bool
}
class YGridLabelPainter {
+List<double> gridLineQuotes
+int pipSize
+double Function(double quote) quoteToCanvasY
+GridStyle style
+double topBoundQuote
+double bottomBoundQuote
+double topPadding
+double bottomPadding
+paint(Canvas canvas, Size size)
+shouldRepaint(YGridLabelPainter oldDelegate) bool
+shouldRebuildSemantics(YGridLabelPainter oldDelegate) bool
}
class YGridLabelPainterWeb {
+paint(Canvas canvas, Size size)
}
class GridStyle
class ChartTheme {
+GridStyle gridStyle
}
BasicChartState --> YGridLinePainter : creates
BasicChartState --> YGridLabelPainter : creates
YGridLabelPainter <|-- YGridLabelPainterWeb
YGridLinePainter --> GridStyle : uses
YGridLabelPainter --> GridStyle : uses
BasicChartState --> ChartTheme : reads
ChartTheme --> GridStyle : exposes
File-Level Changes
Tips and commandsInteracting with Sourcery
Customizing Your ExperienceAccess your dashboard to:
Getting Help
|
Dependency Review✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.OpenSSF Scorecard
Scanned Manifest Files |
|
Claude finished @behnam-deriv's task —— View job Code Review Complete ✅I've reviewed this PR focusing on correctness, performance optimization, code quality, and potential regressions. SummaryThis PR successfully optimizes Y-axis painter performance by:
The changes are well-structured and correctly implemented. I've identified one high-priority issue and several low-priority improvements. High Priority Issues1.
|
![sourcery-ai[bot]](https://avatars.githubusercontent.com/in/48477?s=60&v=4){kind=small}
There was a problem hiding this comment.
Hey - I've left some high level feedback:
- The new
topBoundQuote,bottomBoundQuote,topPadding, andbottomPaddingfields are never used inpaint; if they are meant only forquoteToCanvasY, consider either integrating them into the painting logic or removing them to avoid unused state. shouldRepaintnow relies on the new bound/padding fields but still ignores changes toquoteToCanvasY; ifquoteToCanvasYcan change independently (e.g. via different scaling/transform), you may want to include it or its inputs consistently in the comparison for correctness and clarity.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- The new `topBoundQuote`, `bottomBoundQuote`, `topPadding`, and `bottomPadding` fields are never used in `paint`; if they are meant only for `quoteToCanvasY`, consider either integrating them into the painting logic or removing them to avoid unused state.
- `shouldRepaint` now relies on the new bound/padding fields but still ignores changes to `quoteToCanvasY`; if `quoteToCanvasY` can change independently (e.g. via different scaling/transform), you may want to include it or its inputs consistently in the comparison for correctness and clarity.Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
|
These parameters are necessary for shouldRepaint optimization because: Why we can't compare the function directly: Why testing function output didn't work: Jerky animations during bounds/padding changes Why explicit parameters are the standard: |
|
Claude finished @behnam-deriv's task —— View job Code Review Complete ✅I've thoroughly reviewed this PR focusing on correctness, performance optimization, code quality, and potential regressions. I've also analyzed your clarification about why the parameters are necessary. SummaryThis PR successfully optimizes Y-axis painter performance by implementing intelligent conditional repainting instead of always repainting. The implementation is correct and follows established patterns in the codebase. After reviewing your explanation and comparing with High Priority: ✅ NoneMedium Priority: ✅ NoneLow Priority: 2 suggestions for improvementResponse to Your ClarificationThank you for the detailed explanation about closure comparison. You're absolutely correct:
The approach is sound and well-justified. The documentation you added (lines 33-51 in both painters) clearly explains why these parameters exist, which addresses previous reviewer concerns. Detailed Analysis✅ Correctness1. shouldRepaint Logic is Complete and Correct All parameters that affect rendering are properly checked: YGridLabelPainter (lines 69-76): !listEquals(gridLineQuotes, oldDelegate.gridLineQuotes) ||
pipSize != oldDelegate.pipSize ||
style != oldDelegate.style ||
topBoundQuote != oldDelegate.topBoundQuote ||
bottomBoundQuote != oldDelegate.bottomBoundQuote ||
topPadding != oldDelegate.topPadding ||
bottomPadding != oldDelegate.bottomPaddingYGridLinePainter (lines 75-82): !listEquals(gridLineQuotes, oldDelegate.gridLineQuotes) ||
style != oldDelegate.style ||
labelWidth != oldDelegate.labelWidth ||
topBoundQuote != oldDelegate.topBoundQuote ||
bottomBoundQuote != oldDelegate.bottomBoundQuote ||
topPadding != oldDelegate.topPadding ||
bottomPadding != oldDelegate.bottomPadding✅ Correct use of 2. Parameter Propagation is Consistent In
✅ No missing parameters 3. Edge Cases Handled
✅ Performance ImpactBefore this PR: bool shouldRepaint(YGridLabelPainter oldDelegate) => true; // Always repaintAfter this PR: Expected Performance Improvement:
This is a meaningful performance optimization that will be especially noticeable on lower-end devices and during complex chart interactions. ✅ Code QualityStrengths:
Documentation Quality: /// The top bound quote used for repaint optimization.
/// Note: This value is already captured by [quoteToCanvasY] closure
/// and is tracked separately to detect when repainting is needed.This clearly addresses the "why" question that reviewers might have. ✅ Architecture ConsistencyThe pattern matches return rightBoundEpoch != oldDelegate.rightBoundEpoch ||
leftBoundEpoch != oldDelegate.leftBoundEpoch ||
topY != oldDelegate.topY || // Similar to topBoundQuote
bottomY != oldDelegate.bottomY || // Similar to bottomBoundQuote
chartConfig != oldDelegate.chartConfig ||
seriesChanged();Your implementation correctly applies this established pattern to Y-axis painters. ✅ Low Priority Suggestions1. 📝 Add Unit Tests for shouldRepaint LogicCurrent State: No tests exist for Recommendation: Add widget tests to verify
Example test structure: // test/deriv_chart/chart/y_axis/y_grid_label_painter_test.dart
import 'package:flutter_test/flutter_test.dart';
import 'package:deriv_chart/src/deriv_chart/chart/y_axis/y_grid_label_painter.dart';
void main() {
group('YGridLabelPainter', () {
final mockStyle = GridStyle(/* ... */);
YGridLabelPainter createPainter({
List<double>? gridLineQuotes,
double? topBoundQuote,
// ... other params
}) {
return YGridLabelPainter(
gridLineQuotes: gridLineQuotes ?? [1.0, 2.0],
pipSize: 2,
quoteToCanvasY: (q) => q,
style: mockStyle,
topBoundQuote: topBoundQuote ?? 10.0,
bottomBoundQuote: 5.0,
topPadding: 10.0,
bottomPadding: 10.0,
);
}
test('shouldRepaint returns true when topBoundQuote changes', () {
final painter1 = createPainter(topBoundQuote: 10.0);
final painter2 = createPainter(topBoundQuote: 15.0);
expect(painter1.shouldRepaint(painter2), isTrue);
});
test('shouldRepaint returns false when nothing changes', () {
final painter1 = createPainter();
final painter2 = createPainter();
expect(painter1.shouldRepaint(painter2), isFalse);
});
test('shouldRepaint returns true when gridLineQuotes changes', () {
final painter1 = createPainter(gridLineQuotes: [1.0, 2.0]);
final painter2 = createPainter(gridLineQuotes: [1.0, 2.0, 3.0]);
expect(painter1.shouldRepaint(painter2), isTrue);
});
// Test other parameters: bottomBoundQuote, topPadding, bottomPadding, pipSize, style
});
group('YGridLinePainter', () {
// Similar tests for YGridLinePainter
});
}Priority: Low - The code works correctly without tests, but tests would improve maintainability. 2. 🔍 Consider Adding Debug AssertionsCurrent State: No validation of parameter relationships. Suggestion: Add debug-mode assertions to catch invalid states: YGridLabelPainter({
required this.gridLineQuotes,
required this.pipSize,
required this.quoteToCanvasY,
required this.style,
required this.topBoundQuote,
required this.bottomBoundQuote,
required this.topPadding,
required this.bottomPadding,
}) : assert(topBoundQuote > bottomBoundQuote,
'topBoundQuote must be greater than bottomBoundQuote'),
assert(topPadding >= 0, 'topPadding must be non-negative'),
assert(bottomPadding >= 0, 'bottomPadding must be non-negative'),
assert(pipSize >= 0, 'pipSize must be non-negative');Benefits:
Priority: Low - These errors would likely be caught visually anyway. Security & Best Practices ✅
Potential Regressions ✅I've analyzed potential regression risks:
Verification ChecklistBased on the PR checklist: Developer Checklist:
Code Quality:
Testing RecommendationsBefore merging, I recommend:
Final Recommendation✅ APPROVED - Ready to Merge This is a well-implemented performance optimization that:
The two low-priority suggestions (tests and assertions) would improve the code but are not blockers. Great work on this optimization! The explanation you provided about why explicit parameters are needed (vs. comparing closures) demonstrates strong understanding of Dart's closure semantics and Flutter's repaint optimization model. |
|
Claude finished @behnam-deriv's task —— View job Code Review Complete ✅I've thoroughly reviewed this PR focusing on correctness, performance optimization, code quality, and potential regressions. SummaryThis PR successfully optimizes Y-axis painter performance by implementing intelligent conditional repainting instead of always repainting. The implementation is correct and follows established patterns in the codebase. After reviewing the author's clarification about closure comparison issues, I can confirm this is the right approach - it matches the pattern used in Priority Assessment
Detailed Analysis✅ Correctness1. shouldRepaint Logic is Complete Both painters correctly check all parameters that affect rendering: YGridLabelPainter (lines 69-76):
YGridLinePainter (lines 75-82):
The use of 2. Parameter Propagation is Consistent In
3. Architecture Pattern Matches Codebase This follows the same pattern as return rightBoundEpoch != oldDelegate.rightBoundEpoch ||
leftBoundEpoch != oldDelegate.leftBoundEpoch ||
topY != oldDelegate.topY || // Similar to topBoundQuote
bottomY != oldDelegate.bottomY || // Similar to bottomBoundQuote
// ...Your implementation correctly applies this established pattern to Y-axis painters. ✅ 4. Closure Comparison Rationale is Sound The author's explanation is correct:
✅ Performance ImpactBefore this PR: bool shouldRepaint(YGridLabelPainter oldDelegate) => true; // Always repaintAfter this PR: Expected Improvements:
This is a meaningful performance optimization especially noticeable on lower-end devices. ✅ Code QualityStrengths:
Documentation Quality: /// The top bound quote used for repaint optimization.
/// Note: This value is already captured by [quoteToCanvasY] closure
/// and is tracked separately to detect when repainting is needed.This clearly addresses potential reviewer questions about why these parameters exist alongside the closure. ✅ Edge Cases
✅ Potential RegressionsI've analyzed potential regression risks:
Low Priority Suggestions1. 📝 Add Unit Tests for shouldRepaint LogicCurrent State: No tests exist for Recommendation: Add tests to verify // test/deriv_chart/chart/y_axis/y_grid_label_painter_test.dart
import 'package:flutter_test/flutter_test.dart';
void main() {
group('YGridLabelPainter', () {
test('shouldRepaint returns true when topBoundQuote changes', () {
final painter1 = YGridLabelPainter(
gridLineQuotes: [1.0, 2.0],
pipSize: 2,
quoteToCanvasY: (q) => q,
style: mockStyle,
topBoundQuote: 10.0,
bottomBoundQuote: 5.0,
topPadding: 10.0,
bottomPadding: 10.0,
);
final painter2 = YGridLabelPainter(
// ... same params except topBoundQuote: 15.0
);
expect(painter1.shouldRepaint(painter2), isTrue);
});
test('shouldRepaint returns false when nothing changes', () {
// ... test identical painters
});
});
}Priority: Low - Code works correctly without tests, but tests improve maintainability. 2. 🔍 Consider Adding Debug AssertionsSuggestion: Add debug-mode assertions to catch invalid states: YGridLabelPainter({
required this.gridLineQuotes,
// ... other params
}) : assert(topBoundQuote > bottomBoundQuote,
'topBoundQuote must be greater than bottomBoundQuote'),
assert(topPadding >= 0, 'topPadding must be non-negative'),
assert(bottomPadding >= 0, 'bottomPadding must be non-negative'),
assert(pipSize >= 0, 'pipSize must be non-negative');Benefits:
Priority: Low - These errors would likely be caught visually anyway. Security & Best Practices ✅
Response to Previous Review CommentsSourcery-ai's concern about unused parameters: The parameters ARE used - they're essential for
The documentation (lines 33-51) clearly explains this design decision. Final Recommendation✅ APPROVED - Ready to Merge This is a well-implemented performance optimization that:
The two low-priority suggestions (tests and assertions) would improve the code but are not blockers. Great work! The explanation about closure comparison demonstrates strong understanding of Dart semantics and Flutter's repaint optimization model. |
1 participant
… parameters for optimized rendering
Clickup link:
Fixes issue: #
This PR contains the following changes:
Developers Note (Optional)
Pre-launch Checklist (For PR creator)
As a creator of this PR:
Reviewers
Pre-launch Checklist (For Reviewers)
As a reviewer I ensure that:
Pre-launch Checklist (For QA)
Pre-launch Checklist (For Maintainer)
Summary by Sourcery
Refine Y-axis grid painters to depend on chart bounds and paddings and avoid unnecessary repaints.
Enhancements: