Introduce HardwareLayersUpdatesPreferenceCtrl

- Create new HardwareLayersUpdatesPreferenceController
 - Create controller inside the DashboardFragment
 - Port logic from DevelopmentSettings into the controller
 - Fix a typo in preference naming

Bug: 34203528
Test: make RunSettingsRoboTests -j40
Change-Id: I12744051c836b17ca2bfca5a84b9e22eb7b7d677

src/com/android/settings/development/HardwareLayersUpdatesPreferenceController.java

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2017 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.development;
+
+import android.content.Context;
+import android.os.SystemProperties;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.view.ThreadedRenderer;
+
+import com.android.settingslib.development.SystemPropPoker;
+
+public class HardwareLayersUpdatesPreferenceController extends
+        DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener {
+
+    private static final String SHOW_HW_LAYERS_UPDATES_KEY = "show_hw_layers_updates";
+
+    private SwitchPreference mPreference;
+
+    public HardwareLayersUpdatesPreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return SHOW_HW_LAYERS_UPDATES_KEY;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        mPreference = (SwitchPreference) screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean isEnabled = (Boolean) newValue;
+        SystemProperties.set(ThreadedRenderer.DEBUG_SHOW_LAYERS_UPDATES_PROPERTY,
+                isEnabled ? "true" : null);
+        SystemPropPoker.getInstance().poke();
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final boolean isEnabled = SystemProperties.getBoolean(
+                ThreadedRenderer.DEBUG_SHOW_LAYERS_UPDATES_PROPERTY, false /* default */);
+        mPreference.setChecked(isEnabled);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchEnabled() {
+        mPreference.setEnabled(true);
+    }
+
+    @Override
+    protected void onDeveloperOptionsSwitchDisabled() {
+        SystemProperties.set(ThreadedRenderer.DEBUG_SHOW_LAYERS_UPDATES_PROPERTY, null);
+        mPreference.setEnabled(false);
+        mPreference.setChecked(false);
+    }
+}