!fixup Settings: Notch-city: Add 3 mode display cutout handler [3/3]

*nuke unnecessary preference controller
*Also hide cutout settings for devices with no notch

Signed-off-by: Himanshu Kharkar <himanshu.kharkar20@gmail.com>

Author: himanshukharkar

res/xml/display_settings.xml

@@ -94,16 +94,11 @@
             android:summary="@string/summary_placeholder"
             settings:controller="com.android.settings.display.PeakRefreshRatePreferenceController" />
 
-        <!--ListPreference
-            android:icon="@drawable/ic_settings_notch_display"
-            android:key="display_cutout_emulation"
-            android:title="@string/display_cutout_emulation"
-            settings:keywords="@string/display_cutout_emulation_keywords" /-->
-
         <Preference
             android:key="cutout_settings"
             android:fragment="com.android.settings.display.CutoutFragment"
             android:icon="@drawable/ic_settings_notch_display"
+            settings:controller="com.android.settings.display.CutoutPreferenceController"
             android:title="@string/cutout_main" />
 
         <SwitchPreference

src/com/android/settings/DisplaySettings.java

@@ -34,7 +34,6 @@
 import com.android.settings.display.ThemePreferenceController;
 import com.android.settings.display.TimeoutPreferenceController;
 import com.android.settings.display.VrDisplayPreferenceController;
-import com.android.settings.display.EmulateDisplayCutoutPreferenceController;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.core.lifecycle.Lifecycle;
@@ -94,7 +93,6 @@ private static List<AbstractPreferenceController> buildPreferenceControllers(
         controllers.add(new VrDisplayPreferenceController(context));
         controllers.add(new ShowOperatorNamePreferenceController(context));
         controllers.add(new ThemePreferenceController(context));
-        controllers.add(new EmulateDisplayCutoutPreferenceController(context));
         controllers.add(new BrightnessLevelPreferenceController(context, lifecycle));
         return controllers;
     }

src/com/android/settings/display/CutoutPreferenceController.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2021 Wave-OS
+ *
+ * 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.display;
+
+import android.content.Context;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.core.BasePreferenceController;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+
+public class CutoutPreferenceController extends BasePreferenceController implements
+        LifecycleObserver, OnResume {
+
+    private Preference mPreference;
+
+    public CutoutPreferenceController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        return mContext.getResources().getString(
+                com.android.internal.R.string.config_mainBuiltInDisplayCutout
+        ) != "" ? UNSUPPORTED_ON_DEVICE : AVAILABLE;
+    }
+
+    @Override
+    public void onResume() {
+        mPreference.setVisible(isAvailable());
+    }
+}