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this can help you determine if an object fails to hit test.
this might happen if the object falls outside the bounds of its parent
and thus not considered for hit testing in the first place.
if you’re trying to debug compositor layers, consider using the following flags.
use the debugPaintLayerBordersEnabled flag to find the boundaries
of each layer. this flag results in outlining each layer’s bounds in orange.
use the debugRepaintRainbowEnabled flag to display a repainted layer.
whenever a layer repaints, it overlays with a rotating set of colors.
any function or method in the flutter framework that starts with
debug... only works in debug mode.
<topic_end>
<topic_start>
debug animation issues
info note
to debug animations with the least effort, slow them down.
to slow down the animation,
click slow animations in DevTools’ inspector view.
this reduces the animation to 20% speed.
if you want more control over the amount of slowness,
use the following instructions.
set the timeDilation variable (from the scheduler
library) to a number greater than 1.0, for instance, 50.0.
it’s best to only set this once on app startup. if you
change it on the fly, especially if you reduce it while
animations are running, it’s possible that the framework
will observe time going backwards, which will probably
result in asserts and generally interfere with your efforts.
<topic_end>
<topic_start>
debug performance issues
info note
you can achieve similar results to some of these debug
flags using DevTools. some of the debug flags provide little benefit.
if you find a flag with functionality you would like to add to DevTools,
file an issue.
flutter provides a wide variety of top-level properties and functions
to help you debug your app at various points along the
development cycle.
to use these features, compile your app in debug mode.
the following list highlights some of flags and one function from the
rendering library for debugging performance issues.
to set these flags either:
you can generate stack traces on demand as well.
to print your own stack traces, add the debugPrintStack()
function to your app.
<topic_end>
<topic_start>
trace dart code performance
info note
you can use the DevTools timeline events tab to perform traces.
you can also import and export trace files into the timeline view,
but only files generated by DevTools.
to perform custom performance traces and
measure wall or CPU time of arbitrary segments of dart code
like android does with systrace,
use dart:developer timeline utilities.
wrap the code you want to measure in timeline methods.
<code_start>
import 'dart:developer';
void main() {
Timeline.startSync('interesting function');
// iWonderHowLongThisTakes();
Timeline.finishSync();
}
<code_end>
to ensure that the runtime performance characteristics closely match that
of your final product, run your app in profile mode.
<topic_end>
<topic_start>
add performance overlay
info note
you can toggle display of the performance overlay on
your app using the performance overlay button in the
flutter inspector. if you prefer to do it in code,
use the following instructions.
to enable the PerformanceOverlay widget in your code,
set the showPerformanceOverlay property to true on the
MaterialApp, CupertinoApp, or WidgetsApp
constructor:
<topic_end>
<topic_start>
example 10
<code_start>
import 'package:flutter/material.dart';
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
widget build(BuildContext context) {
return MaterialApp(
showPerformanceOverlay: true,
title: 'my awesome app',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
),
home: const MyHomePage(title: 'my awesome app'),
);
}
}
<code_end>
(if you’re not using MaterialApp, CupertinoApp,