Fixes: Hidden FAB's in Interactive Book are active when hidden. #173

[Aadeesh11]

Fixes #173

Describe the changes you have made in this PR -
Hidden FAB's are now inactive, i.e do not do anything when tapped.

Note: Please check Allow edits from maintainers. if you would like us to assist in the PR.

[manjotsidhu]

Thanks for your contribution. Your changes are great. But let's look at a bigger picture. First we need to understand that those buttons are "invisible" such that even if they are not visible, they take the space since it's opacity is only set. Is there a better way to simply remove the fab button instead of just hiding it ? If that's possible then that would already fix the onclick behaviour since it will be gone. If it's not possible then we can consider these changes as the best solution to the issue.

[Aadeesh11]

@manjotsidhu thanks for your insights, will try to remove the FAB button.

[manjotsidhu]

@manjotsidhu thanks for your insights, will try to remove the FAB button.

Just try, if nothing works out then we can use this change.

[coveralls]

Pull Request Test Coverage Report for Build 1538954400

• 0 of 6 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.06%) to 73.502%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/ui/views/ib/ib_page_view.dart	0	6	0.0%

Totals
Change from base Build 1507540316:	-0.06%
Covered Lines:	3853
Relevant Lines:	5242

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💛 - Coveralls

[Aadeesh11]

@manjotsidhu I tried removing the FAB buttons, but in this case we don't have the nice fade in/out effect on the buttons.
In this case buttons appear/disappear suddenly instead of fading.