Introduce CoolColorTemperaturePreferenceController

- Create new CoolColorTemperaturePreferenceController
 - Create controller inside the DashboardFragment
 - Port logic from DevelopmentSettings into the controller

Bug: 34203528
Test: make RunSettingsRoboTests -j40
Change-Id: Ib138dd55f197ae4cc14db4f3414abdd644e6b202

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

@@ -0,0 +1,100 @@
+/*
+ * 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.annotation.VisibleForTesting;
+import android.support.v14.preference.SwitchPreference;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.widget.Toast;
+
+import com.android.settings.R;
+import com.android.settingslib.development.SystemPropPoker;
+
+public class CoolColorTemperaturePreferenceController extends
+        DeveloperOptionsPreferenceController implements
+        Preference.OnPreferenceChangeListener {
+
+    private static final String COLOR_TEMPERATURE_KEY = "color_temperature";
+
+    @VisibleForTesting
+    static final String COLOR_TEMPERATURE_PROPERTY = "persist.sys.debug.color_temp";
+
+    private SwitchPreference mPreference;
+
+    public CoolColorTemperaturePreferenceController(Context context) {
+        super(context);
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return mContext.getResources().getBoolean(R.bool.config_enableColorTemperature);
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return COLOR_TEMPERATURE_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 isColorTemperatureEnabled = (Boolean) newValue;
+        SystemProperties.set(COLOR_TEMPERATURE_PROPERTY,
+                Boolean.toString(isColorTemperatureEnabled));
+        SystemPropPoker.getInstance().poke();
+        displayColorTemperatureToast();
+        return true;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        final boolean enableColorTemperature = SystemProperties.getBoolean(
+                COLOR_TEMPERATURE_PROPERTY, false /* default */);
+        mPreference.setChecked(enableColorTemperature);
+    }
+
+    @Override
+    public void onDeveloperOptionsEnabled() {
+        if(!isAvailable()) {
+            return;
+        }
+        mPreference.setEnabled(true);
+    }
+
+    @Override
+    public void onDeveloperOptionsDisabled() {
+        if(!isAvailable()) {
+            return;
+        }
+        SystemProperties.set(COLOR_TEMPERATURE_PROPERTY, Boolean.toString(false));
+        mPreference.setChecked(false);
+        mPreference.setEnabled(false);
+    }
+
+    @VisibleForTesting
+    void displayColorTemperatureToast() {
+        Toast.makeText(mContext, R.string.color_temperature_toast, Toast.LENGTH_LONG).show();
+    }
+}

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

@@ -183,7 +183,7 @@ public class DevelopmentSettingsDashboardFragment extends RestrictedDashboardFra
         // convert to file encryption
         // picture color mode
         // webview implementation
-        // cool color temperature
+        controllers.add(new CoolColorTemperaturePreferenceController(context));
         // automatic system updates
         // system ui demo mode
         // quick settings developer tiles