android: Allow redraws and resizes when a Surface is present
#3897
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MarijnS95
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Sep 2, 2024
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| if self.window_has_surface { | ||
| if resized { |
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Given the asserts above I want to get rid of this double checking, except for handling a user-triggered redraw request.
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Shouldn't we also assert if the user triggers request_redraw while there is no surface?
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Since it could be async, I don't want to be that harsh on them - for now.
Perhaps that changes once we wire redraws up to Choreographer (and perhaps have a default "keep automatically requesting redraws every vsync" mode).
MarijnS95
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Sep 2, 2024
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| // TODO: Theoretically the wake-up should also be handled when there's no surface | ||
| timeout = if self.window_has_surface | ||
| && (self.pending_redraw || self.window_target.proxy_wake_up.load(Ordering::Relaxed)) |
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Specifically, a non-pending_redraw arbitrary wakeup.
MarijnS95
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Sep 2, 2024
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| // /// `onStart()` - `onStop()` lifecycle, denoting when the app is visible | ||
| // TODO: Might use activity_visible for allowing proxy wakeup events? | ||
| // activity_visible: bool, | ||
| // /// `onResume()` - `onPause()` lifecycle, denoting when the app is actively interacted with | ||
| // activity_active: bool, | ||
| // TODO: This should be per-Activity (likely analogous to per-Window) state. | ||
| window_has_surface: bool, |
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I started with these states just to see what would happen, but it's quite common to have:
onStart()onResume()NativeWindowCreatedNativeWindowResizedNativeWindowRedrawNeededWindowFocusChangedto1- ...
WindowFocusChangedto0onPause()NativeWindowDestroyedonStop()- (
SaveInstanceState...)
So keying off of NativeWindowCreated/Destroyed is our only safe bet.
madsmtm
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Sep 2, 2024
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... and not _just when the activity is active_. [Android's activity lifecycle] denotes that `onResume()` and `onPause()` are called when the activity changes the "active" state (which is separate from the "focused" state) and may _or may not_ be followed or preceded by the `onStart()` - `onStop()` lifecycle which denotes Activity _visibility_. The latter more closely relates to when a surface is present (since when the activity is not active, but still visible redraws and resizes are still possible and expected) but also doesn't exactly represent it. Note that Android fires its `WindowResized` and `RedrawNeeded` callbacks at least once, directly after `InitWindow`, and _should_ (but this is not explicitly documented) never fire again after `TerminateWindow`. Theoretically this isn't the right state to key off of for arbitrary `EventLoop` wakeups via the `Proxy` though. [Android's activity lifecycle]: https://developer.android.com/guide/components/activities/activity-lifecycle
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... and not just when the activity is active. Android's activity lifecycle denotes that
onResume()andonPause()are called when the activity changes the "active" state (which is separate from the "focused" state) and may or may not be followed or preceded by theonStart()-onStop()lifecycle which denotes Activity visibility. The latter more closely relates to when a surface is present (since when the activity is not active, but still visible redraws and resizes are still possible and expected) but also doesn't exactly represent it.Note that Android fires its
WindowResizedandRedrawNeededcallbacks at least once, directly afterInitWindow, and should (but this is not explicitly documented) never fire again afterTerminateWindow.Theoretically this isn't the right state to key off of for arbitrary
EventLoopwakeups via theProxythough.(PR spun out from #3786)
changelogmodule if knowledge of this change could be valuable to users