Convert the rest of encryption page into pref controller

Bug: 32953042
Test: robotests
Change-Id: I6c1b28314a988e6499065ddaee2aeae0ac28c537

src/com/android/settings/security/RestrictedEncryptionPreferenceController.java

@@ -0,0 +1,45 @@
+/*
+ * 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.security;
+
+import android.content.Context;
+import android.os.UserHandle;
+import android.os.UserManager;
+
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+public abstract class RestrictedEncryptionPreferenceController extends
+        AbstractPreferenceController implements PreferenceControllerMixin {
+
+    protected final UserManager mUserManager;
+
+    private final UserHandle mUserHandle;
+    private final String mUserRestriction;
+
+    public RestrictedEncryptionPreferenceController(Context context, String userRestriction) {
+        super(context);
+        mUserHandle = UserHandle.of(UserHandle.myUserId());
+        mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
+        mUserRestriction = userRestriction;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return !mUserManager.hasBaseUserRestriction(mUserRestriction, mUserHandle);
+    }
+}