Fix text selection edge scrolling when inside a horizontal scrollable #140250

Renzo-Olivares · 2023-12-15T21:54:32Z

Consider AxisDirection when calculating scroll offset used in determining TextSelection during a drag/long press drag. Previously it seems that we were assuming the direction was always vertical

flutter/packages/flutter/lib/src/widgets/text_selection.dart

Lines 2842 to 2844 in 30cc831

    
           final Offset scrollableOffset = Offset( 
        
             0.0, 
        
             _scrollPosition - _dragStartScrollOffset,

.

SelectableText now considers RenderEditable offset changes and Scrollable offset changes when calculating the TextSelection during a long press drag.

Pre-launch Checklist

I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
I read the [Tree Hygiene] wiki page, which explains my responsibilities.
I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
I signed the [CLA].
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is [test-exempt].
All existing and new tests are passing.

Renzo-Olivares · 2024-01-10T02:32:19Z

packages/flutter/lib/src/material/selectable_text.dart

A way we can avoid having these overrides in selectable_text.dart so we can use the logic already in text_selection.dart is to use editableText.readOnly to differentiate between SelectableText and EditableText at the TextSelectionGestureDetector level. Not sure if we want to do this since maybe a user of TextField/EditableText might set readOnly to true and question why their gestures are behaving differently.

What's the behavior difference exactly?

It's not too much code to be concerning, but either way I can't wait to unify these so we don't have to think about problems like this!

The main difference is that on iOS a long press on static text select word-by-word, and on editable text it moves the collapsed cursor to the position.

On all other platforms (Android) a long press selects word-by-word.

…l scrollable

justinmc

LGTM 👍

Still debating your question in https://github.com/flutter/flutter/pull/140250/files#r1446817469 but I think it's fine either way.

justinmc · 2024-01-24T22:52:01Z

packages/flutter/lib/src/material/selectable_text.dart

What's the behavior difference exactly?

It's not too much code to be concerning, but either way I can't wait to unify these so we don't have to think about problems like this!

justinmc · 2024-01-24T22:55:12Z

packages/flutter/lib/src/material/selectable_text.dart

+        ? Offset(renderEditable.offset.pixels - _dragStartViewportOffset, 0.0)
+        : Offset(0.0, renderEditable.offset.pixels - _dragStartViewportOffset);
+    final double effectiveScrollPosition = _scrollPosition - _dragStartScrollOffset;
+    final bool scrollingOnVerticalAxis = _scrollDirection == AxisDirection.up || _scrollDirection == AxisDirection.down;


Nit: would this be nicer as a switch or am I just overly excited to use switch everywhere?

I think a switch would work but might be a little verbose for this specific case. I think the logical comparison is clear and concise enough for this case.

final bool scrollingOnVerticalAxis = switch (_scrollDirection) { AxisDirection.up => true, AxisDirection.down => true, AxisDirection.right => false, AxisDirection.left => false, };

justinmc · 2024-01-24T23:01:33Z

packages/flutter/test/widgets/selectable_text_test.dart

+
+    final TestGesture gesture =
+        await tester.startGesture(selectableTextStart + const Offset(200.0, 0.0));
+    await tester.pump(const Duration(milliseconds: 500));


Nit: Maybe use kLongPressTimeout.

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github-actions bot added a: text input Entering text in a text field or keyboard related problems framework flutter/packages/flutter repository. See also f: labels. f: material design flutter/packages/flutter/material repository. labels Dec 15, 2023

Renzo-Olivares force-pushed the selection-fix branch from 39bc576 to 7c9d1b7 Compare December 15, 2023 22:25

Renzo-Olivares force-pushed the selection-fix branch 2 times, most recently from 127e1ba to 81e176f Compare January 5, 2024 22:23

Renzo-Olivares closed this Jan 9, 2024

Renzo-Olivares reopened this Jan 10, 2024

Renzo-Olivares force-pushed the selection-fix branch from 81e176f to e8b6bec Compare January 10, 2024 02:27

Renzo-Olivares commented Jan 10, 2024

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Renzo-Olivares added 7 commits January 24, 2024 13:07

Fix text selection edge scrolling when EditableText is in a horizonta…

2cfb532

…l scrollable

Add test

7e15aa5

update test

715d32e

Add test

bbb1967

updates

22a5e95

update tests

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updates

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Renzo-Olivares force-pushed the selection-fix branch from e8b6bec to e7f6fd8 Compare January 24, 2024 21:07

Renzo-Olivares added 4 commits January 24, 2024 13:57

dont run test on Android

f3b18a0

add TODO

ccdd1c6

add desktop test

4a3e84c

updates

d1d754c

Renzo-Olivares requested a review from justinmc January 24, 2024 22:44

justinmc approved these changes Jan 24, 2024

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eba38c4 Fix text selection edge scrolling when inside a horizontal sc…

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…rollable (flutter/flutter#140250)

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Fix text selection edge scrolling when inside a horizontal scrollable #140250

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Renzo-Olivares commented Dec 15, 2023 •

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	final Offset scrollableOffset = Offset(
	0.0,
	_scrollPosition - _dragStartScrollOffset,

Fix text selection edge scrolling when inside a horizontal scrollable #140250

Fix text selection edge scrolling when inside a horizontal scrollable #140250

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Renzo-Olivares commented Dec 15, 2023 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Renzo-Olivares commented Dec 15, 2023 •

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