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Tweak refresh of notification channel group preferences

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Previously, we were discarding and re-adding all channel preference switches when a group was toggled. This caused the group switch itself to flicker and sometimes lose the a11y focus as well. Because the group toggle is always at the top, it's not necessary to ever re-sort it (which is the main reason for doing the remove+add dance).

This CL also resurrects ChannelListPreferenceControllerTest which was disabled.

Fixes: 248056830
Test: atest ChannelListPreferenceControllerTest

Change-Id: I5672c102d4571430e26ad6bee92d8c88794214ae
This commit is contained in:
Matías Hernández
2023-04-20 15:25:08 +02:00
parent a7152b9573
commit 8c40305ad6
2 changed files with 78 additions and 58 deletions
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25
src/com/android/settings/notification/app/ChannelListPreferenceController.java
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@@ -236,13 +236,16 @@ public class ChannelListPreferenceController extends NotificationPreferenceContr
@NonNull PreferenceGroup groupPrefGroup) {
int initialPrefCount = groupPrefGroup.getPreferenceCount();
List<Preference> finalOrderedPrefs = new ArrayList<>();
Preference appDefinedGroupToggle;
if (group.getId() == null) {
// For the 'null' group, set the "Other" title.
groupPrefGroup.setTitle(R.string.notification_channels_other);
appDefinedGroupToggle = null;
} else {
// For an app-defined group, set their name and create a row to toggle 'isBlocked'.
groupPrefGroup.setTitle(group.getName());
finalOrderedPrefs.add(addOrUpdateGroupToggle(groupPrefGroup, group));
appDefinedGroupToggle = addOrUpdateGroupToggle(groupPrefGroup, group);
finalOrderedPrefs.add(appDefinedGroupToggle);
}
// Here "empty" means having no channel rows; the group toggle is ignored for this purpose.
boolean initiallyEmpty = groupPrefGroup.getPreferenceCount() == finalOrderedPrefs.size();
@@ -268,13 +271,25 @@ public class ChannelListPreferenceController extends NotificationPreferenceContr
// remove all preferences and re-add them all.
// This is required to ensure proper ordering of inserted channels, and it simplifies logic
// at the cost of computation in the rare case that the list is changing.
// As an optimization, keep the app-defined-group toggle. That way it doesn't "flicker"
// (due to remove+add) when toggling the group.
int numFinalGroups = finalOrderedPrefs.size();
boolean hasInsertions = !initiallyEmpty && initialPrefCount != numFinalGroups;
boolean requiresRemoval = postAddPrefCount != numFinalGroups;
boolean keepGroupToggle =
appDefinedGroupToggle != null && groupPrefGroup.getPreferenceCount() > 0
&& groupPrefGroup.getPreference(0) == appDefinedGroupToggle
&& finalOrderedPrefs.get(0) == appDefinedGroupToggle;
if (hasInsertions || requiresRemoval) {
groupPrefGroup.removeAll();
for (Preference preference : finalOrderedPrefs) {
groupPrefGroup.addPreference(preference);
if (keepGroupToggle) {
while (groupPrefGroup.getPreferenceCount() > 1) {
groupPrefGroup.removePreference(groupPrefGroup.getPreference(1));
}
} else {
groupPrefGroup.removeAll();
}
for (int i = (keepGroupToggle ? 1 : 0); i < finalOrderedPrefs.size(); i++) {
groupPrefGroup.addPreference(finalOrderedPrefs.get(i));
}
}
}
@@ -322,7 +337,7 @@ public class ChannelListPreferenceController extends NotificationPreferenceContr
if (channel.getImportance() > IMPORTANCE_LOW) {
channelPref.setIcon(getAlertingIcon());
} else {
channelPref.setIcon(R.drawable.empty_icon);
channelPref.setIcon(mContext.getDrawable(R.drawable.empty_icon));
}
channelPref.setIconSize(PrimarySwitchPreference.ICON_SIZE_SMALL);
channelPref.setTitle(channel.getName());