Add disabled checkbox preference

A checkbox preference that users can't change, but with non-disabled
test for legibilty.

Test: make -j RunSettingsRoboTests
Bug: 77657376
Change-Id: Iea9bbcc5efbf80cbc380fb8d5a360fe8386889a0

res/xml/zen_mode_settings.xml

@@ -23,10 +23,9 @@
     settings:keywords="@string/keywords_zen_mode_settings">
 
     <!-- sound vibration -->
-    <CheckBoxPreference
+    <com.android.settings.widget.DisabledCheckBoxPreference
         android:key="zen_effect_sound"
-        android:title="@string/zen_mode_block_effect_sound"
-        android:enabled="false" />
+        android:title="@string/zen_mode_block_effect_sound" />
 
     <!-- What to block (effects) -->
     <Preference

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

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 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.util.AttributeSet;
+import android.view.View;
+
+import android.support.v7.preference.CheckBoxPreference;
+import android.support.v7.preference.PreferenceViewHolder;
+
+/**
+ * A CheckboxPreference with a disabled checkbox. Differs from CheckboxPreference.setDisabled()
+ * in that the text is not dimmed.
+ */
+public class DisabledCheckBoxPreference extends CheckBoxPreference {
+
+    public DisabledCheckBoxPreference(Context context, AttributeSet attrs,
+            int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    public DisabledCheckBoxPreference(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    public DisabledCheckBoxPreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public DisabledCheckBoxPreference(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+
+        View view = holder.findViewById(android.R.id.checkbox);
+        view.setEnabled(false);
+        holder.itemView.setEnabled(false);
+    }
+
+    @Override
+    protected void performClick(View view) {
+        // Do nothing
+    }
+}

tests/robotests/src/com/android/settings/widget/DisabledCheckBoxPreferenceTest.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2018 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 static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+
+import android.support.v7.preference.R;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceViewHolder;
+import android.widget.LinearLayout;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class DisabledCheckBoxPreferenceTest {
+
+    private Context mContext;
+    private View mRootView;
+    private DisabledCheckBoxPreference mPref;
+    private PreferenceViewHolder mHolder;
+
+    @Before
+    public void setUp() {
+        mContext = RuntimeEnvironment.application;
+        mRootView = View.inflate(mContext, R.layout.preference, null /* parent */);
+        mHolder = PreferenceViewHolder.createInstanceForTests(mRootView);
+        mPref = new DisabledCheckBoxPreference(mContext);
+    }
+
+    private void inflatePreference() {
+        final LayoutInflater inflater = LayoutInflater.from(mContext);
+        final LinearLayout widgetView = mHolder.itemView.findViewById(android.R.id.widget_frame);
+        assertThat(widgetView).isNotNull();
+        inflater.inflate(R.layout.preference_widget_checkbox, widgetView, true);
+        mPref.onBindViewHolder(mHolder);
+    }
+
+    @Test
+    public void onBindViewHolder_checkboxDisabled() {
+        inflatePreference();
+        assertThat(mRootView.findViewById(android.R.id.checkbox).isEnabled()).isFalse();
+    }
+
+    @Test
+    public void checkboxOnClick_doesNothing() {
+        Preference.OnPreferenceClickListener onClick =
+                mock(Preference.OnPreferenceClickListener.class);
+        mPref.setOnPreferenceClickListener(onClick);
+        inflatePreference();
+
+        mPref.performClick(mRootView);
+
+        verify(onClick, never()).onPreferenceClick(any());
+    }
+}