[Android] [TextBox] fix a bug which cause cannot call out the soft keyboard again after closing it

[Tangent-90]

[Android] fix a bug which cause closing soft keyboard does not clear focus on TextBox, which makes clicking on the TextBox cannot call out the soft keyboard again

What does the pull request do?

When the TextBox got focus, subscribe to IInputPane.StateChanged, to listen the keyboard closing event.
After the keyboard closed, remove the focus, and remove the subscribe to the event.

What is the current behavior?

After closing the soft keyboard, cannot call out it again by clicking on the TextBox, as it was focused already.
This behaviour might be related to #14736

Screenrecorder-2024-05-04-23-14-37-630.mp4

What is the updated/expected behavior with this PR?

After closing the soft keyboard, can call out it again by clicking on the TextBox.

How was the solution implemented (if it's not obvious)?

When the TextBox got focus, subscribe to IInputPane.StateChanged, to listen the keyboard closing event.
After the keyboard closed, remove the focus, so that the keyboard can be call out again.

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0048072-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[cla-avalonia]

• All contributors have signed the CLA.

[Tangent-90]

@cla-avalonia agree

[emmauss]

Focus should not be cleared on the textbox when software keyboard is closed, because there may be ongoing operations that require the textbox to keep focus, like with an opened context menu. Instead, tapping the textbox should try to open the software keyboard if it's closed.

[Tangent-90]

Focus should not be cleared on the textbox when software keyboard is closed, because there may be ongoing operations that require the textbox to keep focus, like with an opened context menu. Instead, tapping the textbox should try to open the software keyboard if it's closed.

Is there a way to open the soft keyboard? I am not familiar with the code base, and the removing focus behavior is the default behaviour before 11.1.x

[emmauss]

Focus should not be cleared on the textbox when software keyboard is closed, because there may be ongoing operations that require the textbox to keep focus, like with an opened context menu. Instead, tapping the textbox should try to open the software keyboard if it's closed.

Is there a way to open the soft keyboard? I am not familiar with the code base, and the removing focus behavior is the default behaviour before 11.1.x

removing focus was the default, but it was buggy behavior, as explained in the pr you linked.

[Tangent-90]

Can you guide me to make it can show soft keyboard? @emmauss

[emmauss]

Can you guide me to make it can show soft keyboard? @emmauss

Currently, there is no API to directly show the input pane in avalonia, that's directly available to controls

[Tangent-90]

Focus should not be cleared on the textbox when software keyboard is closed, because there may be ongoing operations that require the textbox to keep focus, like with an opened context menu. Instead, tapping the textbox should try to open the software keyboard if it's closed.

fixed

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0048218-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[emmauss]

A better option would be to add an api for TextInputMethodClient to trigger the software keyboard on demand.
I feel updating the focus manager itself could cause issues somewhere.

[Tangent-90]

A better option would be to add an api for TextInputMethodClient to trigger the software keyboard on demand.
I feel updating the focus manager itself could cause issues somewhere.

updated

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0048256-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[Tangent-90]

Is there any update?