Add work-only-category controller

The controller will hide category if there is no child in it.

Change-Id: I9bbcc4115b991574e608933f98857b0b4eb2ed7d
Fixes: 62185871
Test: robotests

src/com/android/settings/widget/WorkOnlyCategory.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2016 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.widget;
+
+import android.content.Context;
+import android.os.UserManager;
+import android.support.v7.preference.PreferenceCategory;
+import android.util.AttributeSet;
+
+import com.android.settings.SelfAvailablePreference;
+import com.android.settings.Utils;
+
+/**
+ * A PreferenceCategory that is only visible when the device has a work profile.
+ */
+public class WorkOnlyCategory extends PreferenceCategory implements SelfAvailablePreference {
+
+    public WorkOnlyCategory(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public boolean isAvailable(Context context) {
+        return Utils.getManagedProfile(UserManager.get(context)) != null;
+    }
+}

src/com/android/settings/widget/WorkOnlyCategoryPreferenceController.java

@@ -0,0 +1,57 @@
+/*
+ * 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.widget;
+
+import android.content.Context;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+import java.util.List;
+
+public class WorkOnlyCategoryPreferenceController extends AbstractPreferenceController
+        implements PreferenceControllerMixin {
+
+    private final String mKey;
+    private final List<AbstractPreferenceController> mChildren;
+
+    public WorkOnlyCategoryPreferenceController(Context context,
+            String key, List<AbstractPreferenceController> childrenControllers) {
+        super(context);
+        mKey = key;
+        mChildren = childrenControllers;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        if (mChildren == null || mChildren.isEmpty()) {
+            return true;
+        }
+        // Category is available if any child is available
+        for (AbstractPreferenceController controller : mChildren) {
+            if (controller.isAvailable()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return mKey;
+    }
+}