8377350: [iOS] Add support for UIWindowScene

[jperedadnr]

This PR adds support for iOS native window scene, which was added some time ago starting iOS 13 (in 2019).

Current iOS development requires iOS SDK 26, and minimum deployment target is set to iOS 15 (meaning that apps will run on all devices with iOS 15 or greater).

It is safe then to not include the safe-guard if (@available(iOS 13.0, *)) {...}, which will make the code more complex.

Adding the native UIScene and UIWindowScene APIs follows the Apple standards, but as a fallback, the deprecated API is still kept there (keyWindow was deprecated starting iOS 13, and initWithFrame: was deprecated starting iOS 26). This is for a follow-up issue.

Note: This patch doesn't really add support for multiple windows, as this would require more complex changes.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8377350: [iOS] Add support for UIWindowScene (Enhancement - P4)

Reviewers

• Johan Vos (@johanvos - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jfx.git pull/2072/head:pull/2072
$ git checkout pull/2072

Update a local copy of the PR:
$ git checkout pull/2072
$ git pull https://git.openjdk.org/jfx.git pull/2072/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2072

View PR using the GUI difftool:
$ git pr show -t 2072

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jfx/pull/2072.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

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[openjdk]

@jperedadnr This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8377350: [iOS] Add support for UIWindowScene

Reviewed-by: jvos

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[mlbridge]

Webrevs

• 00: Full (1f117ed7)

[johanvos]

Aren't the dimensions printed when you print the "object" using @ ?

[jperedadnr]

No, CGRect is a struct, and you get this warning:

warning: format specifies type 'id' but the argument has type 'CGRect' (aka 'struct CGRect') [-Wformat]

which can be safely ignored of course, but then the logs won't show a null value:

FRAME: (null)

and that's why I applied the change.

[johanvos]

Looks good. This PR only touches ios-specific files, and does not affect any other platform.