Add the preference controller to control accessibility button fade preference

* Opacity preference will be disabled when fade is disabled

cherry picked from commit f9fdedaafe

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

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