[Feature request] Full-screen Image Viewer

[Skquark]

What we could use is a good simple Image Viewer, which includes full screen pan & zoom. The best one I found for the job I think is https://pub.dev/packages/easy_image_viewer which even lets you open multiple images and page through them, and a bunch of other practical options as well.. I've used a different image viewer in Flutter before, but this one seems like it's easy and would satisfy many people's needs.

[Skquark]

I went ahead an coded the ImageViewer feature up, felt bad relying on you guys for a feature that I wanted in my app. Took a couple days to figure out the best integration, but it's a fairly simple launcher for easy_image_viewer that I hope there's not problem with the way I did it. It wasn't a widget control, it's more of an invoke_method, so I copied page.launch_url() for the way to do it. Here's the page method:

  def open_image_viewer(
        self,
        image: Union[str, List[str]],
        swipe_dismissible: Optional[bool] = True,
        double_tap_zoomable: Optional[bool] = True,
        background_color: Optional[str] = None,
        close_button_color: Optional[str] = None,
        close_button_tooltip: Optional[str] = "Close",
        immersive: Optional[bool] = True,
        initial_index: Optional[int] = 0,
    )

So to run it, it's as easy as page.open_image_viewer(image_url_list) to open the full screen image pager, or for single image url. Should work correctly, but I haven't tested it personally yet since it's a whole process to compile and test. Feel free to make any changes, I can help with documentation if you want, it's a self-explanatory function. I'm looking forward to use this all over my Stable Diffusion image generation app once the pr #943 gets pushed. Thanks.

[Skquark]

Still wanting to have this feature so I created another Pull Request at #2248 with the updated commits. Hope it can be reopened, reviewed, fixed if needed, and merged with main. Let me know if there's anything else I can assist with to speed up the process, like helping with the docs. Thanks.