Clean up AssistGesturePreferenceController

The preference controller shouldn't be shared between the
"Assist Gesture" parent setting, and the child setting within

Fixes: 64318213

Test: manual test of settings && make -j RunSettingsRoboTests
Change-Id: I2d2437e2036881a08977924dc1386aa1fab67070

src/com/android/settings/gestures/AssistGestureSettingsPreferenceController.java

@@ -0,0 +1,172 @@
+/*
+ * 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.gestures;
+
+import static android.provider.Settings.Secure.ASSIST_GESTURE_ENABLED;
+import static android.provider.Settings.Secure.ASSIST_GESTURE_SILENCE_ALERTS_ENABLED;
+
+import android.content.Context;
+import android.content.Intent;
+import android.provider.Settings;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.support.v7.preference.TwoStatePreference;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.settings.R;
+import com.android.settings.overlay.FeatureFactory;
+import com.android.settings.search.DatabaseIndexingUtils;
+import com.android.settings.search.InlineSwitchPayload;
+import com.android.settings.search.ResultPayload;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+
+public class AssistGestureSettingsPreferenceController extends GesturePreferenceController
+        implements OnResume {
+
+    private static final String PREF_KEY_VIDEO = "gesture_assist_video";
+
+    private static final String SECURE_KEY_ASSIST = ASSIST_GESTURE_ENABLED;
+    private static final String SECURE_KEY_SILENCE = ASSIST_GESTURE_SILENCE_ALERTS_ENABLED;
+    private static final int ON = 1;
+    private static final int OFF = 0;
+
+    private final String mAssistGesturePrefKey;
+    private final AssistGestureFeatureProvider mFeatureProvider;
+    private boolean mWasAvailable;
+
+    private PreferenceScreen mScreen;
+    private Preference mPreference;
+
+    @VisibleForTesting
+    boolean mAssistOnly;
+
+    public AssistGestureSettingsPreferenceController(Context context, Lifecycle lifecycle,
+            String key, boolean assistOnly) {
+        super(context, lifecycle);
+        mFeatureProvider = FeatureFactory.getFactory(context).getAssistGestureFeatureProvider();
+        mWasAvailable = isAvailable();
+        mAssistGesturePrefKey = key;
+        mAssistOnly = assistOnly;
+    }
+
+    @Override
+    public boolean isAvailable() {
+        if (mAssistOnly) {
+            return mFeatureProvider.isSupported(mContext);
+        } else {
+            return mFeatureProvider.isSensorAvailable(mContext);
+        }
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        mScreen = screen;
+        mPreference = screen.findPreference(getPreferenceKey());
+        // Call super last or AbstractPreferenceController might remove the preference from the
+        // screen (if !isAvailable()) before we can save a reference to it.
+        super.displayPreference(screen);
+    }
+
+    @Override
+    public void onResume() {
+        if (mWasAvailable != isAvailable()) {
+            // Only update the preference visibility if the availability has changed -- otherwise
+            // the preference may be incorrectly added to screens with collapsed sections.
+            updatePreference();
+            mWasAvailable = isAvailable();
+        }
+    }
+
+    private void updatePreference() {
+        if (mPreference == null) {
+            return;
+        }
+
+        if (isAvailable()) {
+            if (mScreen.findPreference(getPreferenceKey()) == null) {
+                mScreen.addPreference(mPreference);
+            }
+        } else {
+            mScreen.removePreference(mPreference);
+        }
+    }
+
+    private boolean isAssistGestureEnabled() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                SECURE_KEY_ASSIST, ON) != 0;
+    }
+
+    private boolean isSilenceGestureEnabled() {
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                SECURE_KEY_SILENCE, ON) != 0;
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        boolean isEnabled = isAssistGestureEnabled() && mFeatureProvider.isSupported(mContext);
+
+        if (!mAssistOnly) {
+            isEnabled = isEnabled || isSilenceGestureEnabled();
+        }
+
+        if (preference != null) {
+            if (preference instanceof TwoStatePreference) {
+                ((TwoStatePreference) preference).setChecked(isSwitchPrefEnabled());
+            } else {
+                preference.setSummary(isEnabled
+                        ? R.string.gesture_setting_on
+                        : R.string.gesture_setting_off);
+            }
+        }
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean enabled = (boolean) newValue;
+        Settings.Secure.putInt(mContext.getContentResolver(), SECURE_KEY_ASSIST,
+                enabled ? ON : OFF);
+        updateState(preference);
+        return true;
+    }
+
+    @Override
+    protected String getVideoPrefKey() {
+        return PREF_KEY_VIDEO;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return mAssistGesturePrefKey;
+    }
+
+    @Override
+    protected boolean isSwitchPrefEnabled() {
+        // Does nothing
+        return true;
+    }
+
+    @Override
+    public ResultPayload getResultPayload() {
+        final Intent intent = DatabaseIndexingUtils.buildSubsettingIntent(mContext,
+                AssistGestureSettings.class.getName(), mAssistGesturePrefKey,
+                mContext.getString(R.string.display_settings));
+
+        return new InlineSwitchPayload(SECURE_KEY_ASSIST, ResultPayload.SettingsSource.SECURE,
+                ON /* onValue */, intent, isAvailable(), ON /* defaultValue */);
+    }
+}