Add video to each gesture preference screen.

- Refactor GesturePreference to a generic VideoPreference.
- The old video_preference.xml is only for magnification video, so
  renamed.
- And use VideoPreference in gesture setting pages.
- Refactor common logic into GesturePreferenceController.

Bug: 32637613
Test: RunSettingsRoboTests

Change-Id: I58580b01a32873cb32c5dc5bf2ec021d5b1400cc

tests/robotests/src/com/android/settings/gestures/GesturePreferenceControllerTest.java

@@ -0,0 +1,184 @@
+/*
+ * 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.gestures;
+
+import android.content.Context;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.support.v7.preference.TwoStatePreference;
+
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+import com.android.settings.core.lifecycle.Lifecycle;
+import com.android.settings.widget.VideoPreference;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Answers;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyString;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class GesturePreferenceControllerTest {
+
+
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+    private Context mContext;
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+    private PreferenceScreen mScreen;
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+    private Lifecycle mLifecycle;
+    private TestPrefController mController;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mController = new TestPrefController(mContext, mLifecycle);
+    }
+
+    @Test
+    public void display_configIsTrue_shouldDisplay() {
+        mController.mIsPrefAvailable = true;
+        when(mScreen.findPreference(anyString())).thenReturn(mock(VideoPreference.class));
+
+        mController.displayPreference(mScreen);
+
+        verify(mScreen, never()).removePreference(any(Preference.class));
+    }
+
+    @Test
+    public void display_configIsFalse_shouldNotDisplay() {
+        mController.mIsPrefAvailable = false;
+        when(mScreen.findPreference(mController.getPreferenceKey()))
+                .thenReturn(mock(Preference.class));
+
+        mController.displayPreference(mScreen);
+
+        verify(mScreen).removePreference(any(Preference.class));
+    }
+
+    @Test
+    public void onStart_shouldStartVideoPreference() {
+        final VideoPreference videoPreference = mock(VideoPreference.class);
+        when(mScreen.findPreference(mController.getPreferenceKey())).thenReturn(videoPreference);
+        mController.mIsPrefAvailable = true;
+
+        mController.displayPreference(mScreen);
+        mController.onStart();
+
+        verify(videoPreference).onViewVisible();
+    }
+
+    @Test
+    public void onStop_shouldStopVideoPreference() {
+        final VideoPreference videoPreference = mock(VideoPreference.class);
+        when(mScreen.findPreference(mController.getPreferenceKey())).thenReturn(videoPreference);
+        mController.mIsPrefAvailable = true;
+
+        mController.displayPreference(mScreen);
+        mController.onStop();
+
+        verify(videoPreference).onViewInvisible();
+    }
+
+    @Test
+    public void updateState_preferenceSetCheckedWhenSettingIsOn() {
+        // Mock a TwoStatePreference
+        final TwoStatePreference preference = mock(TwoStatePreference.class);
+        // Set the setting to be enabled.
+        mController.mIsPrefEnabled = true;
+        // Run through updateState
+        mController.updateState(preference);
+
+        // Verify pref is checked (as setting is enabled).
+        verify(preference).setChecked(true);
+    }
+
+    @Test
+    public void updateState_preferenceSetUncheckedWhenSettingIsOff() {
+        // Mock a TwoStatePreference
+        final TwoStatePreference preference = mock(TwoStatePreference.class);
+        // Set the setting to be disabled.
+        mController.mIsPrefEnabled = false;
+
+        // Run through updateState
+        mController.updateState(preference);
+
+        // Verify pref is unchecked (as setting is disabled).
+        verify(preference).setChecked(false);
+    }
+
+    @Test
+    public void updateState_notTwoStatePreference_setSummary() {
+        // Mock a regular preference
+        final Preference preference = mock(Preference.class);
+        // Set the setting to be disabled.
+        mController.mIsPrefEnabled = false;
+
+        // Run through updateState
+        mController.updateState(preference);
+
+        // Verify summary is set to off (as setting is disabled).
+        verify(preference).setSummary(com.android.settings.R.string.gesture_setting_off);
+    }
+
+    private class TestPrefController extends GesturePreferenceController {
+
+        boolean mIsPrefAvailable;
+        boolean mIsPrefEnabled;
+
+        public TestPrefController(Context context,
+                Lifecycle lifecycle) {
+            super(context, lifecycle);
+        }
+
+        @Override
+        public boolean isAvailable() {
+            return mIsPrefAvailable;
+        }
+
+        @Override
+        public String getPreferenceKey() {
+            return null;
+        }
+
+        @Override
+        protected String getVideoPrefKey() {
+            return null;
+        }
+
+        @Override
+        protected boolean isSwitchPrefEnabled() {
+            return mIsPrefEnabled;
+        }
+
+        @Override
+        public boolean onPreferenceChange(Preference preference, Object newValue) {
+            return false;
+        }
+    }
+}