1 /* 2 * Copyright (C) 2021 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.car.settings.common.rotary; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.view.View; 22 23 /** 24 * A transparent {@link View} that can take focus. It is used as a view that can invisibly 25 * take rotary focus when another view is unable to take this focus. 26 * 27 * Adapted from {@link com.android.car.ui.FocusParkingView} for finer control over focus in 28 * dual-pane layouts. This separate class is also needed to allow a second "FocusParkingView" 29 * element within an activity, since only one {@link com.android.car.ui.FocusParkingView} is 30 * allowed per activity. 31 */ 32 public class SettingsFocusParkingView extends View { SettingsFocusParkingView(Context context)33 public SettingsFocusParkingView(Context context) { 34 super(context); 35 init(); 36 } 37 SettingsFocusParkingView(Context context, AttributeSet attrs)38 public SettingsFocusParkingView(Context context, AttributeSet attrs) { 39 super(context, attrs); 40 init(); 41 } 42 SettingsFocusParkingView(Context context, AttributeSet attrs, int defStyleAttr)43 public SettingsFocusParkingView(Context context, AttributeSet attrs, int defStyleAttr) { 44 super(context, attrs, defStyleAttr); 45 init(); 46 } 47 SettingsFocusParkingView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)48 public SettingsFocusParkingView(Context context, AttributeSet attrs, int defStyleAttr, 49 int defStyleRes) { 50 super(context, attrs, defStyleAttr, defStyleRes); 51 init(); 52 } 53 init()54 private void init() { 55 // This view is focusable, visible and enabled so it can take focus. 56 setFocusable(View.FOCUSABLE); 57 setVisibility(VISIBLE); 58 setEnabled(true); 59 60 // This view is not clickable so it won't affect the app's behavior when the user clicks on 61 // it by accident. 62 setClickable(false); 63 64 // This view is always transparent. 65 setAlpha(0f); 66 67 // Prevent Android from drawing the default focus highlight for this view when it's focused. 68 setDefaultFocusHighlightEnabled(false); 69 } 70 } 71