private static void initializeFocusControl()
{
// In addition to queueing actual flag setting, we want to save a separate copy of the flag values
// every time focus is lost, and restore them once the application gains focus again, so we add
// events to handle that. This needs to be done because Unity itself overwrites all flags (likely
// to enforce the behavior expected by System.fullScreen's current value).
if (!focusControlInitialized)
{
saveCurrentFlags();
GameObjectSurrogate.getInstance().onGainedFocus += restoreCurrentFlags;
GameObjectSurrogate.getInstance().onLostFocus += saveCurrentFlags;
focusControlInitialized = true;
}
}
private static void queueFlagUpdates()
{
// We perform View.* and Window.* flag updates in a pretty roundabout way:
// we call a coroutine at the end of the current frame, which then asks Android to run
// some code on the UI thread.
// This potentially adds a frame of delay to screen bar updates, but is done because:
// * we can successive calls to setViewFlag()/setWindowFlag() to stack correctly,
// without transient flag states that can be reverted by the OS (plus, we want
// getViewFlags() and getWindowFlags() to return the correct flag status, even
// if unset)
// * view flags can only be set on Android's UI thread
if (!hasQueuedFlagUpdates)
{
hasQueuedFlagUpdates = true;
initializeFocusControl();
GameObjectSurrogate.getInstance().StartCoroutine(performFlagUpdatesOnUiThread());
}
}