Add the preference controller to control accessibility button fade preference

* Opacity preference will be disabled when fade is disabled

Bug: 173940869
Test: atest AccessibilityButtonFadePreferenceControllerTest AccessibilityButtonOactiyPreferenceControllerTest
Change-Id: I1efd9760aa0287899cddd10ddd9a88a81ccc39ba

res/xml/accessibility_button_settings.xml

@@ -50,7 +50,8 @@
         android:key="accessibility_button_fade"
         android:title="@string/accessibility_button_fade_title"
         android:summary="@string/accessibility_button_fade_summary"
-        android:persistent="false"/>
+        android:persistent="false"
+        settings:controller="com.android.settings.accessibility.FloatingMenuFadePreferenceController"/>
 
     <com.android.settings.widget.SeekBarPreference
         android:key="accessibility_button_opacity"

src/com/android/settings/accessibility/FloatingMenuFadePreferenceController.java

@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.accessibility;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.database.ContentObserver;
+import android.os.Handler;
+import android.os.Looper;
+import android.provider.Settings;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.SwitchPreference;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnPause;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+
+/** Preference controller that controls the fade switch button in accessibility button page. */
+public class FloatingMenuFadePreferenceController extends BasePreferenceController implements
+        Preference.OnPreferenceChangeListener, LifecycleObserver, OnResume, OnPause {
+
+    private static final int OFF = 0;
+    private static final int ON = 1;
+
+    private final ContentResolver mContentResolver;
+    @VisibleForTesting
+    final ContentObserver mContentObserver;
+
+    @VisibleForTesting
+    SwitchPreference mPreference;
+
+    public FloatingMenuFadePreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        mContentResolver = context.getContentResolver();
+        mContentObserver = new ContentObserver(new Handler(Looper.getMainLooper())) {
+            @Override
+            public void onChange(boolean selfChange) {
+                updateAvailabilityStatus();
+            }
+        };
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AccessibilityUtil.isFloatingMenuEnabled(mContext)
+                ? AVAILABLE : DISABLED_DEPENDENT_SETTING;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean isEnabled = (boolean) newValue;
+        putFloatingMenuFadeValue(isEnabled);
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        final SwitchPreference switchPreference = (SwitchPreference) preference;
+
+        switchPreference.setChecked(getFloatingMenuFadeValue() == ON);
+    }
+
+    @Override
+    public void onResume() {
+        mContentResolver.registerContentObserver(
+                Settings.Secure.getUriFor(
+                        Settings.Secure.ACCESSIBILITY_BUTTON_MODE),
+                        /* notifyForDescendants= */ false, mContentObserver);
+    }
+
+    @Override
+    public void onPause() {
+        mContentResolver.unregisterContentObserver(mContentObserver);
+    }
+
+    private void updateAvailabilityStatus() {
+        mPreference.setEnabled(AccessibilityUtil.isFloatingMenuEnabled(mContext));
+    }
+
+    private int getFloatingMenuFadeValue() {
+        return Settings.Secure.getInt(mContentResolver,
+                Settings.Secure.ACCESSIBILITY_FLOATING_MENU_FADE_ENABLED, ON);
+    }
+
+    private void putFloatingMenuFadeValue(boolean isEnabled) {
+        Settings.Secure.putInt(mContentResolver,
+                Settings.Secure.ACCESSIBILITY_FLOATING_MENU_FADE_ENABLED,
+                isEnabled ? ON : OFF);
+    }
+}

src/com/android/settings/accessibility/FloatingMenuOpacityPreferenceController.java

@@ -38,6 +38,7 @@ public class FloatingMenuOpacityPreferenceController extends SliderPreferenceCon
 
     @VisibleForTesting
     static final float DEFAULT_OPACITY = 0.55f;
+    private static final int FADE_ENABLED = 1;
     private static final float MIN_PROGRESS = 10f;
     private static final float MAX_PROGRESS = 100f;
     @VisibleForTesting
@@ -87,7 +88,10 @@ public class FloatingMenuOpacityPreferenceController extends SliderPreferenceCon
                 Settings.Secure.getUriFor(
                         Settings.Secure.ACCESSIBILITY_BUTTON_MODE), /* notifyForDescendants= */
                 false, mContentObserver);
-
+        mContentResolver.registerContentObserver(
+                Settings.Secure.getUriFor(
+                        Settings.Secure.ACCESSIBILITY_FLOATING_MENU_FADE_ENABLED),
+                        /* notifyForDescendants= */ false, mContentObserver);
     }
 
     @Override
@@ -119,7 +123,11 @@ public class FloatingMenuOpacityPreferenceController extends SliderPreferenceCon
     }
 
     private void updateAvailabilityStatus() {
-        mPreference.setEnabled(AccessibilityUtil.isFloatingMenuEnabled(mContext));
+        final boolean fadeEnabled = Settings.Secure.getInt(mContentResolver,
+                Settings.Secure.ACCESSIBILITY_FLOATING_MENU_FADE_ENABLED, FADE_ENABLED)
+                == FADE_ENABLED;
+
+        mPreference.setEnabled(AccessibilityUtil.isFloatingMenuEnabled(mContext) && fadeEnabled);
     }
 
     private int convertOpacityFloatToInt(float value) {

tests/robotests/src/com/android/settings/accessibility/FloatingMenuFadePreferenceControllerTest.java

@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.accessibility;
+
+import static android.provider.Settings.Secure.ACCESSIBILITY_BUTTON_MODE_FLOATING_MENU;
+import static android.provider.Settings.Secure.ACCESSIBILITY_BUTTON_MODE_NAVIGATION_BAR;
+
+import static com.android.settings.core.BasePreferenceController.AVAILABLE;
+import static com.android.settings.core.BasePreferenceController.DISABLED_DEPENDENT_SETTING;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.provider.Settings;
+
+import androidx.preference.SwitchPreference;
+import androidx.test.core.app.ApplicationProvider;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.Spy;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+import org.robolectric.RobolectricTestRunner;
+
+/** Tests for {@link FloatingMenuFadePreferenceController}. */
+@RunWith(RobolectricTestRunner.class)
+public class FloatingMenuFadePreferenceControllerTest {
+
+    @Rule
+    public MockitoRule mocks = MockitoJUnit.rule();
+
+    private static final int OFF = 0;
+    private static final int ON = 1;
+
+    @Spy
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+    @Mock
+    private ContentResolver mContentResolver;
+    private final SwitchPreference mSwitchPreference = new SwitchPreference(mContext);
+    private FloatingMenuFadePreferenceController mController;
+
+    @Before
+    public void setUp() {
+        when(mContext.getContentResolver()).thenReturn(mContentResolver);
+        mController = new FloatingMenuFadePreferenceController(mContext, "test_key");
+    }
+
+    @Test
+    public void getAvailabilityStatus_a11yBtnModeFloatingMenu_returnAvailable() {
+        Settings.Secure.putInt(mContentResolver, Settings.Secure.ACCESSIBILITY_BUTTON_MODE,
+                ACCESSIBILITY_BUTTON_MODE_FLOATING_MENU);
+
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(AVAILABLE);
+    }
+
+    @Test
+    public void getAvailabilityStatus_a11yBtnModeNavigationBar_returnDisabledDependentSetting() {
+        Settings.Secure.putInt(mContentResolver, Settings.Secure.ACCESSIBILITY_BUTTON_MODE,
+                ACCESSIBILITY_BUTTON_MODE_NAVIGATION_BAR);
+
+        assertThat(mController.getAvailabilityStatus()).isEqualTo(DISABLED_DEPENDENT_SETTING);
+    }
+
+    @Test
+    public void updateState_keyFloatingMenuFadeDisabled_fadeIsDisabled() {
+        Settings.Secure.putInt(mContentResolver,
+                Settings.Secure.ACCESSIBILITY_FLOATING_MENU_FADE_ENABLED, OFF);
+
+        mController.updateState(mSwitchPreference);
+
+        assertThat(mSwitchPreference.isChecked()).isFalse();
+    }
+
+    @Test
+    public void onPreferenceChange_floatingMenuFadeEnabled_keyFloatingMenuFadeIsOn() {
+        mController.onPreferenceChange(mSwitchPreference, Boolean.TRUE);
+
+        final int actualValue = Settings.Secure.getInt(mContentResolver,
+                Settings.Secure.ACCESSIBILITY_FLOATING_MENU_FADE_ENABLED, OFF);
+        assertThat(actualValue).isEqualTo(ON);
+    }
+
+    @Test
+    public void onChange_floatingMenuFadeChangeToDisabled_preferenceDisabled() {
+        mController.mPreference = mSwitchPreference;
+        Settings.Secure.putInt(mContentResolver,
+                Settings.Secure.ACCESSIBILITY_FLOATING_MENU_FADE_ENABLED, OFF);
+
+        mController.mContentObserver.onChange(false);
+
+        assertThat(mController.mPreference.isEnabled()).isFalse();
+    }
+
+    @Test
+    public void onResume_registerSpecificContentObserver() {
+        mController.onResume();
+
+        verify(mContentResolver).registerContentObserver(
+                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_BUTTON_MODE), false,
+                mController.mContentObserver);
+    }
+
+    @Test
+    public void onPause_unregisterContentObserver() {
+        mController.onPause();
+
+        verify(mContentResolver).unregisterContentObserver(mController.mContentObserver);
+    }
+}

tests/robotests/src/com/android/settings/accessibility/FloatingMenuOpacityPreferenceControllerTest.java

@@ -126,6 +126,10 @@ public class FloatingMenuOpacityPreferenceControllerTest {
         verify(mContentResolver).registerContentObserver(
                 Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_BUTTON_MODE), false,
                 mController.mContentObserver);
+        verify(mContentResolver).registerContentObserver(
+                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_FLOATING_MENU_FADE_ENABLED),
+                false,
+                mController.mContentObserver);
     }
 
     @Test