Convert SecuritySubSetting into DashboardFragment

Bug: 32953042
Test: robotests
Change-Id: Iecdb0a42695644ff8aa095bcd49b5ccb16aa46d4

src/com/android/settings/security/screenlock/PatternVisiblePreferenceController.java

@@ -0,0 +1,70 @@
+/*
+ * 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.screenlock;
+
+import android.app.admin.DevicePolicyManager;
+import android.content.Context;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.TwoStatePreference;
+
+import com.android.internal.widget.LockPatternUtils;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.core.AbstractPreferenceController;
+
+public class PatternVisiblePreferenceController extends AbstractPreferenceController
+        implements PreferenceControllerMixin, Preference.OnPreferenceChangeListener {
+
+    private static final String PREF_KEY = "visiblepattern";
+
+    private final int mUserId;
+    private final LockPatternUtils mLockPatternUtils;
+
+    public PatternVisiblePreferenceController(Context context, int userId,
+            LockPatternUtils lockPatternUtils) {
+        super(context);
+        mUserId = userId;
+        mLockPatternUtils = lockPatternUtils;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        return isPatternLock();
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return PREF_KEY;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        ((TwoStatePreference) preference).setChecked(
+                mLockPatternUtils.isVisiblePatternEnabled(mUserId));
+    }
+
+    private boolean isPatternLock() {
+        return mLockPatternUtils.isSecure(mUserId)
+                && mLockPatternUtils.getKeyguardStoredPasswordQuality(mUserId)
+                == DevicePolicyManager.PASSWORD_QUALITY_SOMETHING;
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        mLockPatternUtils.setVisiblePatternEnabled((Boolean) newValue, mUserId);
+        return true;
+    }
+}