Add TogglePrefController for Color Invert

Add ColorInversionPreferenceController,
and remove old control code in fragment.

Change-Id: I773e5aa2d6c9bf6b5140be45ee60567a7ed22318
Fixes: 67997748
Test: make RunSettingsRoboTests

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

@@ -224,6 +224,7 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
     private Preference mDisplayDaltonizerPreferenceScreen;
     private Preference mVibrationPreferenceScreen;
     private SwitchPreference mToggleInversionPreference;
+    private ColorInversionPreferenceController mInversionPreferenceController;
 
     private int mLongPressTimeoutDefault;
 
@@ -304,9 +305,6 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
         if (mSelectLongPressTimeoutPreference == preference) {
             handleLongPressTimeoutPreferenceChange((String) newValue);
             return true;
-        } else if (mToggleInversionPreference == preference) {
-            handleToggleInversionPreferenceChange((Boolean) newValue);
-            return true;
         }
         return false;
     }
@@ -318,11 +316,6 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
                 mLongPressTimeoutValueToTitleMap.get(stringValue));
     }
 
-    private void handleToggleInversionPreferenceChange(boolean checked) {
-        Settings.Secure.putInt(getContentResolver(),
-                Settings.Secure.ACCESSIBILITY_DISPLAY_INVERSION_ENABLED, (checked ? 1 : 0));
-    }
-
     @Override
     public boolean onPreferenceTreeClick(Preference preference) {
         if (mToggleHighTextContrastPreference == preference) {
@@ -412,7 +405,9 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
 
         // Display inversion.
         mToggleInversionPreference = (SwitchPreference) findPreference(TOGGLE_INVERSION_PREFERENCE);
-        mToggleInversionPreference.setOnPreferenceChangeListener(this);
+        mInversionPreferenceController =
+                new ColorInversionPreferenceController(getContext(), TOGGLE_INVERSION_PREFERENCE);
+        mInversionPreferenceController.displayPreference(getPreferenceScreen());
 
         // Power button ends calls.
         mTogglePowerButtonEndsCallPreference =
@@ -652,8 +647,7 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
                         Settings.Secure.ACCESSIBILITY_HIGH_TEXT_CONTRAST_ENABLED, 0) == 1);
 
         // If the quick setting is enabled, the preference MUST be enabled.
-        mToggleInversionPreference.setChecked(Settings.Secure.getInt(getContentResolver(),
-                Settings.Secure.ACCESSIBILITY_DISPLAY_INVERSION_ENABLED, 0) == 1);
+        mInversionPreferenceController.updateState(mToggleInversionPreference);
 
         // Power button ends calls.
         if (KeyCharacterMap.deviceHasKey(KeyEvent.KEYCODE_POWER)

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

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2018 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 com.android.settings.core.TogglePreferenceController;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+public class ColorInversionPreferenceController extends TogglePreferenceController {
+    @VisibleForTesting
+    static final int ON = 1;
+    @VisibleForTesting
+    static final int OFF = 0;
+
+    public ColorInversionPreferenceController(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    public boolean isChecked() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                Settings.Secure.ACCESSIBILITY_DISPLAY_INVERSION_ENABLED, OFF) == ON;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        return Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Secure.ACCESSIBILITY_DISPLAY_INVERSION_ENABLED, (isChecked ? ON : OFF));
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return AVAILABLE;
+    }
+}