Add setting to allow configuration of long press home gesture

This allows configuration of long press home gesture on 2-/3-button navigation configurations. It allows the user to enable and disable the invocation of assistant app using said gesture.

Bug: 191888710
Test: Unit tests and on a physical device.
Change-Id: I18cb290058ac5c2a748d40802b942404f548b868

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

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2021 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.view.WindowManagerPolicyConstants.NAV_BAR_MODE_2BUTTON_OVERLAY;
+import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_3BUTTON_OVERLAY;
+
+import android.content.Context;
+import android.provider.Settings;
+
+import com.android.settings.core.TogglePreferenceController;
+
+/**
+ * Configures behaviour of long press home button to invoke assistant app gesture.
+ */
+public class ButtonNavigationSettingsAssistController extends TogglePreferenceController {
+
+    public ButtonNavigationSettingsAssistController(Context context, String key) {
+        super(context, key);
+    }
+
+    @Override
+    public boolean isChecked() {
+        boolean onByDefault = mContext.getResources().getBoolean(
+                com.android.internal.R.bool.config_assistLongPressHomeEnabledDefault);
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                Settings.Secure.ASSIST_LONG_PRESS_HOME_ENABLED, onByDefault ? 1 : 0) == 1;
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        return Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Secure.ASSIST_LONG_PRESS_HOME_ENABLED, isChecked ? 1 : 0);
+    }
+
+    @Override
+    public int getAvailabilityStatus() {
+        if (SystemNavigationPreferenceController.isOverlayPackageAvailable(mContext,
+                NAV_BAR_MODE_2BUTTON_OVERLAY)
+                || SystemNavigationPreferenceController.isOverlayPackageAvailable(mContext,
+                NAV_BAR_MODE_3BUTTON_OVERLAY)) {
+            return AVAILABLE;
+        }
+
+        return UNSUPPORTED_ON_DEVICE;
+    }
+}