Add the preference controller to control accessibility button location preference

cherry picked from commit 123464429d

Bug: 173940869
Test: atest AccessibilityButtonLocationPreferenceControllerTest
Change-Id: I49a23b2eb4e07e79afcefc5a148c23b06396ec1c
Merged-In: I49a23b2eb4e07e79afcefc5a148c23b06396ec1c

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

@@ -0,0 +1,89 @@
+/*
+ * 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.Context;
+import android.provider.Settings;
+import android.util.ArrayMap;
+
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+
+import com.google.common.primitives.Ints;
+
+/** Preference controller that controls the preferred location in accessibility button page. */
+public class AccessibilityButtonLocationPreferenceController extends BasePreferenceController
+        implements Preference.OnPreferenceChangeListener {
+
+    private final ArrayMap<String, String> mValueTitleMap = new ArrayMap<>();
+    private int mDefaultLocation;
+
+    public AccessibilityButtonLocationPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+        initValueTitleMap();
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AccessibilityUtil.isGestureNavigateEnabled(mContext)
+                ? DISABLED_DEPENDENT_SETTING : AVAILABLE;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final ListPreference listPreference = (ListPreference) preference;
+        final Integer value = Ints.tryParse((String) newValue);
+        if (value != null) {
+            Settings.Secure.putInt(mContext.getContentResolver(),
+                    Settings.Secure.ACCESSIBILITY_BUTTON_MODE, value);
+            updateState(listPreference);
+        }
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        final ListPreference listPreference = (ListPreference) preference;
+
+        listPreference.setValue(getCurrentAccessibilityButtonMode());
+    }
+
+    private String getCurrentAccessibilityButtonMode() {
+        final int mode = Settings.Secure.getInt(mContext.getContentResolver(),
+                Settings.Secure.ACCESSIBILITY_BUTTON_MODE, mDefaultLocation);
+        return String.valueOf(mode);
+    }
+
+    private void initValueTitleMap() {
+        if (mValueTitleMap.size() == 0) {
+            final String[] values = mContext.getResources().getStringArray(
+                    R.array.accessibility_button_location_selector_values);
+            final String[] titles = mContext.getResources().getStringArray(
+                    R.array.accessibility_button_location_selector_titles);
+            final int mapSize = values.length;
+
+            mDefaultLocation = Integer.parseInt(values[0]);
+            for (int i = 0; i < mapSize; i++) {
+                mValueTitleMap.put(values[i], titles[i]);
+            }
+        }
+    }
+}