iOS TextSelectionToolbar fidelity #127757

luccasclezar · 2023-05-27T18:39:35Z

CupertinoTextSelectionToolbar is different from the native one, with some UI and UX issues. More details on the linked issue.

#127756

Currently the only problem that I listed on the linked issue that I couldn't fix was the horizontal scrolling, but to workaround this I added a GestureDetector to change pages when swiping the toolbar. It's not exactly the same as native as there is no scroll animation, but it works.

I'm creating this PR a little early to have some feedback as these changes were more complex than the ones in my last PR. Probably best if @justinmc is involved 😅

Version	Video
Flutter Old	old.mov
Flutter New	new.mov
Native	native.mov

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.

flutter-dashboard · 2023-05-27T18:39:39Z

It looks like this pull request may not have tests. Please make sure to add tests before merging. If you need an exemption to this rule, contact Hixie on the #hackers channel in Chat (don't just cc him here, he won't see it! He's on Discord!).

If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

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justinmc

This is an awesome PR, the menu looks so much better from your videos. I think there's one architectural problem to solve (_CupertinoTextSelectionToolbarItemsController) but otherwise the approach looks good.

Is the point of that controller to be able to pass information up the class hierarchy from _RenderCupertinoTextSelectionToolbarItems to _CupertinoTextSelectionToolbarContentState? I think we need to find a better way to do that other than a shared mutable class.

Fortunately it seems like you only need that information in a callback (_handleNext/PreviousPage) so we can probably look it up without having to worry about layout order. Could you pass a key to _CupertinoTextSelectionToolbarItems and then look up the information using GlobalKey.currentWidget? Something like that should be doable...

justinmc · 2023-05-30T18:09:26Z

packages/flutter/lib/src/cupertino/text_selection_toolbar.dart

@@ -903,6 +940,11 @@ class _RenderCupertinoTextSelectionToolbarItems extends RenderBox with Container
        // already been taken care of when laying out the children to
        // accommodate the back button.
      }
+
+      // Update the controller values so that we can check in the horizontal


I think the Flutter style guide recommends not using "we" etc., so maybe say "...so that it's possible to check them in the horizontal..."

Reminder on this one.

luccasclezar · 2023-05-30T20:36:14Z

Thank you! 😁

About the controller, yes, I only use it to know if it's possible to navigate to previous/next page when dragging, basically.

But I don't understand how a GlobalKey would solve this problem. The only way to know if there is a previous/next button (as far as I can tell) is in _RenderCupertinoTextSelectionToolbarItems.performLayout:

flutter/packages/flutter/lib/src/cupertino/text_selection_toolbar.dart

Lines 946 to 947 in 6762521

    
           controller?.hasNextPage = page != currentPage; 
        
           controller?.hasPreviousPage = page > 0;

So we need to set the variables in this method. From what I understood of your suggestion, a GlobalKey should be used instead of the "controller", like

globalKey.currentWidget.hasNextPage = page != currentPage;
globalKey.currentWidget.hasPreviousPage = page > 0;

But how would I set variables using globalKey.currentWidget if all widget variables are final? If _RenderCupertinoTextSelectionToolbarItems were a Widget I could assign it a GlobalKey and get its properties, but RenderBox doesn't have a key parameter.

Probably I'm missing something here, but I couldn't come up with a solution that doesn't involve a shared mutable class. 😅

tgucio · 2023-05-30T20:50:21Z

packages/flutter/lib/src/cupertino/text_selection_toolbar.dart

+// correctly shows/hides the previous/next buttons automatically, but now the
+// horizontal drag gesture callback has to check whether it's possible to
+// navigate or not, making this necessary.
+class _CupertinoTextSelectionToolbarItemsController {


I think controller classes are normally used in APIs for others widgets to change the state of a stateful widget. Here we're operating on a render object so this should probably be done using individual fields e.g.

void updateRenderObject(BuildContext context, _RenderCupertinoTextSelectionToolbarItems renderObject) { renderObject ..page = page ..hasPreviousPage = hasPreviousPage ..hasNextPage = hasNextPage ..dividerColor = dividerColor

Then in the RenderBox class you'd have a setter and a getter just like with dividerColor.

The problem with this approach is that, as far as I understand it, I wouldn't be able to update hasNextPage and hasPreviousPage in _RenderCupertinoTextSelectionToolbarItems, and have it available in its parent (_CupertinoTextSelectionToolbarContentState) when the user does a horizontal drag gesture on the whole toolbar.

This is where I update the values:

flutter/packages/flutter/lib/src/cupertino/text_selection_toolbar.dart

Lines 944 to 947 in 6762521

// Update the controller values so that we can check in the horizontal

// drag gesture callback when it's possible to navigate.

controller?.hasNextPage = page != currentPage;

controller?.hasPreviousPage = page > 0;

And this is where I use them:

flutter/packages/flutter/lib/src/cupertino/text_selection_toolbar.dart

Lines 461 to 475 in 6762521

void _handleNextPage() {

if (_toolbarItemsController.hasNextPage) {

_controller.reverse();

_controller.addStatusListener(_statusListener);

_nextPage = _page + 1;

}

}

void _handlePreviousPage() {

if (_toolbarItemsController.hasPreviousPage) {

_controller.reverse();

_controller.addStatusListener(_statusListener);

_nextPage = _page - 1;

}

}

If the hasPreviousPage / hasNextPage fields are only updated by _RenderCupertinoTextSelectionToolbarItems (which makes sense given this will depend on the incoming constraints for the RenderBox), perhaps one approach would be to:

keep them as bool values without getter/setter

from the widget state, in the gesture handler, do something like:

final RenderBox? renderBox = context.findRenderObject() as RenderBox?; if (renderBox is _RenderCupertinoTextSelectionToolbarItems && renderBox.hasPreviousPage) { [...]

Perhaps there will be a bit extra complexity if you insert another widget inbetween like AnimatedSize: if this is the case and context.findRenderObject() returns another box, you could pass a global key to the _CupertinoTextSelectionToolbarItems widget you're looking for and do:

renderBox = _toolbarItemsKey.currentContext?.findRenderObject()

This is commonly done across the framework so you can search for findRenderObject().

+1 that's what I was thinking!

That makes sense and it's way cleaner, thank you! I will see if I can remove the controller until this weekend.

Just fixed this and all tests passed, should be OK now 😁

justinmc · 2023-06-26T20:49:14Z

@tgucio Can you give the final approval here?

tgucio · 2023-06-27T15:14:02Z

LGTM - thanks again for the PR!

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luccasclezar added 4 commits May 27, 2023 00:45

Update CupertinoSelectionToolbar fidelity

69293e2

Improve CupertinoTextSelectionToolbar fidelity

aefc317

Add swipe gesture to CupertinoTextSelectionToolbar

d3c10f9

Merge branch 'flutter:master' into master

112f0a2

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luccasclezar added 2 commits May 29, 2023 17:06

Fix tests for Cupertino text toolbar update

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Use CupertinoButton on text toolbar button

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Fix text_field_test.dart after toolbar changes

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Fix text_field_test.dart after toolbar changes

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Remove controller from Cupertino toolbar

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	// Update the controller values so that we can check in the horizontal
	// drag gesture callback when it's possible to navigate.
	controller?.hasNextPage = page != currentPage;
	controller?.hasPreviousPage = page > 0;

	void _handleNextPage() {
	if (_toolbarItemsController.hasNextPage) {
	_controller.reverse();
	_controller.addStatusListener(_statusListener);
	_nextPage = _page + 1;
	}
	}

	void _handlePreviousPage() {
	if (_toolbarItemsController.hasPreviousPage) {
	_controller.reverse();
	_controller.addStatusListener(_statusListener);
	_nextPage = _page - 1;
	}
	}

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