Is there any way to control the systemback when th...
# compose-androida
Aman Verma
09/21/2023, 12:19 PMIs there any way to control the systemback when the m3 modalbottomsheet is being shown?
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Stylianos Gakis
09/21/2023, 12:26 PMWhat do you mean by “control”?
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Aman Verma
09/21/2023, 12:27 PMDisable/Enable conditionally.
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Stylianos Gakis
09/21/2023, 12:27 PMDoes BackHandler() not fit your needs here?
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Aman Verma
09/21/2023, 12:28 PMBackHandler doesn’t work in these cases.
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Stylianos Gakis
09/21/2023, 12:28 PMAre you hitting this https://issuetracker.google.com/issues/297380343 issue perhaps?
If not, what do you mean by “doesn’t work”?
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Aman Verma
09/21/2023, 12:29 PMI don’t have that flag in the manifest, and the issue is that it is getting dismissed, even If I use BackHandler.
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Stylianos Gakis
09/21/2023, 12:30 PMRight, and did you try putting BackHandler both inside the m3.sheet content lambda and outside of it? Do both of them get ignored?
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Aman Verma
09/21/2023, 12:31 PMI did, but I will recheck to confirm.
Aman Verma
09/21/2023, 12:33 PMYup, both of them get ignored.
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Stylianos Gakis
09/21/2023, 12:34 PMThen RIP.
Probably this https://issuetracker.google.com/issues/278216859
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ascii
09/21/2023, 2:33 PMM3 bottom sheet has its own self-contained back button handler: https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/[…]android.kt;drc=392df4fcb263770b411399a8342cb3afeeaa1d6d;l=488
ascii
09/21/2023, 2:34 PMThere's no way to disable that I believe, so whatever custom back logic you need to do, try doing it in
onDismissRequests
Stylianos Gakis
09/21/2023, 2:39 PMWhen does onDismissRequest run though? Is it after or before the decision to dismiss is already made?
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ascii
09/21/2023, 2:42 PMI've seen
invokeOnCompletionascii
09/21/2023, 2:42 PMJust search for
onDismissRequest()a
Aman Verma
09/21/2023, 2:43 PMYes, since it is executed post-dismissal, I essentially can’t disable the sheet dismissal.
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ascii
09/21/2023, 2:44 PMOh, so you want something like
DialogProperties(dismissOnBackPress = false, dismissOnClickOutside = false)confirmValueChanges
Stylianos Gakis
09/21/2023, 2:44 PMM3 bottom sheets really are something else to work with. I’ve never filed more bug reports for any other individual component.
Maybe if you’re just starting out with it you can consider looking into using the non-experimental M2 bottom sheets instead?
Unless those are also problematic to use, I didn’t try them out too much.
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ascii
09/21/2023, 2:48 PMI found M2 sheets to be very annoying to work with, because (if I remember correctly) you need to wrap them in a separate *Layout, and handle everything yourself.
The only thing I don't like about M3 modal sheets is that it opens itself up even if you supply an initial state of Hidden. Very counter-intuitive, forcing you to use state variables to control it.
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Stylianos Gakis
09/21/2023, 2:52 PM76 Views