Will the apple sign in button be supported in future updates? https://developer.apple.com/design/human-interface-guidelines/sign-in-with-apple/overview/

This will allow the splashColor to be set. One major benefit to this is the ability remove the ripple effect from the buttons if desired. This can be done by setting splashColor to Colors.transparent. I also updated the tests and the README.

Closes #31

It looks terrible when all buttons have different sizes. This PR adds an attribute expanded to each of them that allows expansion along the horizontal axis to max.

This PR adds apple sign in button built according to the official guidelines - https://developer.apple.com/design/human-interface-guidelines/sign-in-with-apple/overview/ - some details were inexplicit and had to be estimated.

Also, the example main.dart now has a container of SingleScrollChildView to prevent devices with smaller screens to overflow.

I just tried version 0.5.0 in my project with a google button (dark) and I get no icon and this exception:

I/flutter (24157): ══╡ EXCEPTION CAUGHT BY IMAGE RESOURCE SERVICE ╞════════════════════════════════════════════════════ I/flutter (24157): The following assertion was thrown resolving an image codec: I/flutter (24157): Unable to load asset: packages/flutter_auth_buttons/graphics/google-logo.png I/flutter (24157): I/flutter (24157): When the exception was thrown, this was the stack: I/flutter (24157): #0 PlatformAssetBundle.load (package:flutter/src/services/asset_bundle.dart:221:7) I/flutter (24157): I/flutter (24157): #1 AssetBundleImageProvider._loadAsync (package:flutter/src/painting/image_provider.dart:464:44) I/flutter (24157): I/flutter (24157): #2 AssetBundleImageProvider.load (package:flutter/src/painting/image_provider.dart:449:14) I/flutter (24157): #3 ImageProvider.resolve... (package:flutter/src/painting/image_provider.dart:315:48) I/flutter (24157): #4 ImageCache.putIfAbsent (package:flutter/src/painting/image_cache.dart:160:22) I/flutter (24157): #5 ImageProvider.resolve.. (package:flutter/src/painting/image_provider.dart:315:25) I/flutter (24157): (elided 13 frames from package dart:async) I/flutter (24157): I/flutter (24157): Image provider: AssetImage(bundle: null, name: I/flutter (24157): "packages/flutter_auth_buttons/graphics/google-logo.png") I/flutter (24157): Image key: AssetBundleImageKey(bundle: PlatformAssetBundle#833bd(), name: I/flutter (24157): "packages/flutter_auth_buttons/graphics/google-logo.png", scale: 1.0) I/flutter (24157): ════════════════════════════════════════════════════════════════════════════════════════════════════

Was happy to come upon your flutter_auth_buttons package to use it in my own efforts. I did have to include two more buttons in my project, and felt maybe it could be included in this package.

I couldn't readily find the 'button guidelines' you mentioned in the existing buttons however.

Regardless, thanks for providing this package for use.

Cheers.

Greg

The LayoutBuilder within StretchableButton will cause an error like this:

I/flutter (23641): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (23641): The following assertion was thrown during performLayout():
I/flutter (23641): LayoutBuilder does not support returning intrinsic dimensions.
I/flutter (23641): Calculating the intrinsic dimensions would require running the layout callback speculatively, which
I/flutter (23641): might mutate the live render object tree.
I/flutter (23641):
I/flutter (23641): The relevant error-causing widget was:
I/flutter (23641):   SliverFillRemaining
I/flutter (23641):   
lib/…/account/sign_in_screen.dart:69
I/flutter (23641):
I/flutter (23641): When the exception was thrown, this was the stack:

I increased the font and icon size for the Sign in with Apple button, so that it is the same as for the other sign in buttons. This is in response to Apple rejecting an update to my app because of the 'Sign in with Apple' button having a slightly smaller font than the buttons for the other social login providers.

This is their exact response:

Your app uses Sign in with Apple as a login option but does not use the appropriate Sign in with Apple button design, branding, and/or user interface elements as described in the Sign in With Apple Human Interface Guidelines. Specifically:

- Your Sign in with Apple button is not displayed as prominently in your app as other sign in buttons.

Next Steps

To resolve this issue, revise the Sign in with Apple button design, branding and/or user interface elements in your app so that it follows all the Sign in With Apple Human Interface Guidelines.

Added a simple attribute to the StretchableButton widget to allow for centering of the button contents as the buttons expand.

• I left the default behavior not centered and the attribute false to maintain compatibility.
• I also updated the current library of auth buttons to work with this change.
• Tested within my own project and behaves like original package with new functionality
• Not sure if any documentation changes are needed as it is an easily found attribute for the widgets, open to discussion and revision of current documentation if needed.

Fixes #31

The new facebook "f" icon is required according to the new branding guidelines:

https://en.facebookbrand.com/facebookapp/assets/f-logo/?audience=advertisers https://developers.facebook.com/docs/facebook-login/userexperience/

I'm currently using the Facebook and the Google button.

While I can provider text for both, the alignment on the text with the icon is only correct for the Facebook one.

The google button will align the text to the end (left side in an rtl) and the icon to the right, creating a large margin between them. The text should also be aligned to the right, right after the icon.