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Update MediaQueryData docs for devicePixelRatio overriding#187542

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LongCatIsLooong:media-query-docs
Jun 13, 2026
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Update MediaQueryData docs for devicePixelRatio overriding#187542
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LongCatIsLooong:media-query-docs

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@flutter-dashboard flutter-dashboard Bot added the CICD Run CI/CD label Jun 4, 2026
@github-actions github-actions Bot added the framework flutter/packages/flutter repository. See also f: labels. label Jun 4, 2026

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Code Review

This pull request adds documentation to MediaQueryData.devicePixelRatio explaining its relationship with FlutterView and the behavior when overridden. Feedback points out a typo in the added documentation, where 'encompasing' should be corrected to 'encompassing'.

Comment thread packages/flutter/lib/src/widgets/media_query.dart Outdated
@github-actions github-actions Bot removed the CICD Run CI/CD label Jun 4, 2026
@LongCatIsLooong LongCatIsLooong added the CICD Run CI/CD label Jun 4, 2026
@Piinks Piinks requested review from Renzo-Olivares and justinmc June 9, 2026 22:21

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LGTM, modulo gemini nit. I did see a few uses of devicePixelRatio but most of the cases were either accessing it through the FlutterView or if they were using it, it was not to rescale the UI (except in some minor cases to size a divider though even in these cases I wonder if the intention should have been to use View.of(context).devicePixelRation instead).

https://github.com/search?q=repo%3Aflutter%2Fflutter+path%3A%2F%5Epackages%5C%2Fflutter%5C%2Flib%5C%2Fsrc%5C%2F%2F+%22.devicePixelRatio%22&type=code&p=2

Specific divider cases:

final double dividerHeight = 1.0 / MediaQuery.devicePixelRatioOf(context);

width: 1.0 / MediaQuery.devicePixelRatioOf(context),

dividerWidth: 1.0 / MediaQuery.devicePixelRatioOf(context),

width: 1.0 / MediaQuery.devicePixelRatioOf(context),

@LongCatIsLooong

LongCatIsLooong commented Jun 11, 2026

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should have been to use View.of(context).devicePixelRational instead

View.of only notifies the caller when identity of the view changes. It doesn't do that on DPR changes. Also MediaQuery is a bit more efficient since you can monitor different aspects.

I should have resolved gemini's comment since it's outdated.

Yeah most cases it's either used to create "hairline" separators or to snap something to physical pixels to avoid anti-aliasing.

@LongCatIsLooong LongCatIsLooong added the autosubmit Merge PR when tree becomes green via auto submit App label Jun 11, 2026
@auto-submit auto-submit Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Jun 11, 2026
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auto-submit Bot commented Jun 11, 2026

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autosubmit label was removed for flutter/flutter/187542, because The base commit of the PR is older than 7 days and can not be merged. Please merge the latest changes from the main into this branch and resubmit the PR.

@github-actions github-actions Bot removed the CICD Run CI/CD label Jun 12, 2026
@LongCatIsLooong LongCatIsLooong added the autosubmit Merge PR when tree becomes green via auto submit App label Jun 12, 2026
@auto-submit auto-submit Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Jun 12, 2026
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auto label is removed for flutter/flutter/187542, Failed to enqueue flutter/flutter/187542 with HTTP 400: Pull request Required status check "Merge Queue Guard" is expected..

@LongCatIsLooong LongCatIsLooong added CICD Run CI/CD autosubmit Merge PR when tree becomes green via auto submit App labels Jun 12, 2026
@auto-submit auto-submit Bot added this pull request to the merge queue Jun 12, 2026
Merged via the queue into flutter:master with commit 11e8feb Jun 13, 2026
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@flutter-dashboard flutter-dashboard Bot removed the autosubmit Merge PR when tree becomes green via auto submit App label Jun 13, 2026
auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Jun 15, 2026
Roll Flutter from b7cb925419e6 to 5827d5fd2b8d (35 revisions)

flutter/flutter@b7cb925...5827d5f

2026-06-15 engine-flutter-autoroll@skia.org Roll Skia from 7128af60575a to c8d9f80f13e4 (1 revision) (flutter/flutter#188015)
2026-06-15 jason-simmons@users.noreply.github.com In the APNG decoder, validate the chunk data length before calling GetChunkSize to avoid potential overflow in the chunk size calculation (flutter/flutter#187949)
2026-06-15 engine-flutter-autoroll@skia.org Roll Skia from 6b4ac3bfb39d to 7128af60575a (1 revision) (flutter/flutter#188011)
2026-06-15 engine-flutter-autoroll@skia.org Roll Skia from 0a3b8549cbf0 to 6b4ac3bfb39d (7 revisions) (flutter/flutter#188007)
2026-06-15 98614782+auto-submit[bot]@users.noreply.github.com Reverts "[a11y] Map some framework semantics roles to android classes.  (#185217)" (flutter/flutter#188008)
2026-06-15 chris@bracken.jp [ios] Filter UIScene events to those relating to Flutter VC scene (flutter/flutter#187987)
2026-06-15 jhy03261997@gmail.com [a11y] Map some framework semantics roles to android classes.  (flutter/flutter#185217)
2026-06-15 engine-flutter-autoroll@skia.org Roll Skia from f46928e7f50c to 0a3b8549cbf0 (1 revision) (flutter/flutter#188004)
2026-06-14 stuartmorgan@google.com Rework docs for flutter/packages changelogs (flutter/flutter#187666)
2026-06-14 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from nvzMQAmuRSzo7-wAP... to TbB86Po_HDe1dvXvT... (flutter/flutter#187997)
2026-06-14 engine-flutter-autoroll@skia.org Roll Skia from 4e2c9b5e4dad to f46928e7f50c (1 revision) (flutter/flutter#187996)
2026-06-14 engine-flutter-autoroll@skia.org Roll Skia from c52667607242 to 4e2c9b5e4dad (1 revision) (flutter/flutter#187990)
2026-06-14 737941+loic-sharma@users.noreply.github.com Improve RenderTargetCache docs (flutter/flutter#187893)
2026-06-13 brackenavaron@gmail.com [Test cross_imports] Check cross imports in flutter_test/** (flutter/flutter#187587)
2026-06-13 matt.kosarek@canonical.com Fixing corrupted window size OnEmptyFrameGenerated due to transpsed width/height (flutter/flutter#187954)
2026-06-13 engine-flutter-autoroll@skia.org Roll Skia from 42355271a335 to c52667607242 (2 revisions) (flutter/flutter#187979)
2026-06-13 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from A3eaUn9mQ_EkSNxVI... to nvzMQAmuRSzo7-wAP... (flutter/flutter#187975)
2026-06-13 engine-flutter-autoroll@skia.org Roll Skia from 9ef46390c2d1 to 42355271a335 (1 revision) (flutter/flutter#187974)
2026-06-13 bdero@google.com [Flutter GPU] Make ShaderLibrary.fromAsset asynchronous (flutter/flutter#187716)
2026-06-13 engine-flutter-autoroll@skia.org Roll Skia from 8c89bf2b0ee3 to 9ef46390c2d1 (6 revisions) (flutter/flutter#187968)
2026-06-12 bdero@google.com [Flutter GPU] Add surface API for framework presentation (flutter/flutter#187358)
2026-06-12 bkonyi@google.com [gen_l10n] Exclude inherited keys from untranslated-messages-file (flutter/flutter#187950)
2026-06-12 31859944+LongCatIsLooong@users.noreply.github.com Update `MediaQueryData` docs for devicePixelRatio overriding (flutter/flutter#187542)
2026-06-12 bdero@google.com [Impeller] Fix dirty-range race in DeviceBufferGLES uploads (flutter/flutter#187932)
2026-06-12 pascal@phntm.xyz Compare isModifiedAfter against the given time (flutter/flutter#187727)
2026-06-12 planetmarshall@users.noreply.github.com Enable unit tests for compilation of compute shaders on non-metal backends (flutter/flutter#179683)
2026-06-12 matt.boetger@gmail.com [flutter_tools] Add doctor validator warning for multiple adb installations (flutter/flutter#186031)
2026-06-12 matt.boetger@gmail.com Optimize SHA hash calculation of generated APK (flutter/flutter#187184)
2026-06-12 mu7ammadkamel@hotmail.com Scope widget inspector overlay to the selected widget's modal route (flutter/flutter#186784)
2026-06-12 30870216+gaaclarke@users.noreply.github.com Switches Windows to OpenGLESSDF (flutter/flutter#187877)
2026-06-12 matt.boetger@gmail.com [integration_test] Update README to support modern Kotlin-based setups by default (flutter/flutter#186080)
2026-06-12 jason-simmons@users.noreply.github.com Convert the PNG signature constant in APNGImageGenerator to a std::array and use it in the APNG tests (flutter/flutter#187930)
2026-06-12 matt.boetger@gmail.com Correct backoff retry time cap unit and add regression tests (flutter/flutter#187250)
2026-06-12 chingjun@google.com Fix std::vector out-of-bounds access in Flutter Android JNI and Delegate (flutter/flutter#187218)
2026-06-12 matt.boetger@gmail.com [Android] Adding 30-second timeouts to adb stopApp and uninstallApp (flutter/flutter#187876)

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via-guy pushed a commit to via-guy/flutter that referenced this pull request Jun 26, 2026
…#187542)

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