1 /* 2 * Copyright (C) 2016 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.cluster.sample; 18 19 import android.content.Context; 20 import android.util.AttributeSet; 21 import android.util.Log; 22 import android.view.View; 23 import android.widget.FrameLayout; 24 25 import java.util.ArrayList; 26 import java.util.Arrays; 27 import java.util.HashSet; 28 import java.util.List; 29 import java.util.Set; 30 31 /** 32 * Panel that responsible of holding cards. 33 */ 34 public class CardPanel extends FrameLayout { 35 private final static String TAG = DebugUtil.getTag(CardPanel.class); 36 37 private final List<View> mOrderedChildren = new ArrayList<>(10); 38 private final Set<View> mViewsToBeRemoved = new HashSet<>(); 39 CardPanel(Context context)40 public CardPanel(Context context) { 41 this(context, null); 42 } 43 CardPanel(Context context, AttributeSet attrs)44 public CardPanel(Context context, AttributeSet attrs) { 45 this(context, attrs, 0); 46 } 47 CardPanel(Context context, AttributeSet attrs, int defStyleAttr)48 public CardPanel(Context context, AttributeSet attrs, int defStyleAttr) { 49 super(context, attrs, defStyleAttr); 50 51 setChildrenDrawingOrderEnabled(true); 52 } 53 54 @Override addView(View child, int index)55 public void addView(View child, int index) { 56 super.addView(child, index); 57 if (index < 0) { 58 mOrderedChildren.add(child); 59 } else { 60 mOrderedChildren.add(index, child); 61 } 62 } 63 64 @Override removeView(View view)65 public void removeView(View view) { 66 super.removeView(view); 67 68 mOrderedChildren.remove(view); 69 mViewsToBeRemoved.remove(view); 70 } 71 72 /** 73 * If we are removing view with animation, we do not want to treat this view as visible. 74 */ markViewToBeRemoved(View view)75 public void markViewToBeRemoved(View view) { 76 mViewsToBeRemoved.add(view); 77 } 78 79 childViewExists(View child)80 public boolean childViewExists(View child) { 81 return indexOfChild(child) >= 0 && !mViewsToBeRemoved.contains(child); 82 } 83 84 /** Moves given child behind the top card */ moveChildBehindTheTop(View child)85 public void moveChildBehindTheTop(View child) { 86 if (mOrderedChildren.size() <= 1) { 87 return; 88 } 89 90 int newIndex = mOrderedChildren.size() - 2; 91 int oldIndex = mOrderedChildren.indexOf(child); 92 if (oldIndex == -1) { 93 Log.e(TAG, "Child: " + child + " not found in " 94 + Arrays.toString(mOrderedChildren.toArray())); 95 return; 96 } 97 if (newIndex == oldIndex) { 98 return; 99 } 100 101 // Swap children. 102 View tmpChild = mOrderedChildren.get(newIndex); 103 mOrderedChildren.set(newIndex, child); 104 mOrderedChildren.set(oldIndex, tmpChild); 105 } 106 getTopVisibleChild()107 public View getTopVisibleChild() { 108 for (int i = mOrderedChildren.size() - 1; i >= 0; i--) { 109 View child = mOrderedChildren.get(i); 110 if (child.getVisibility() == VISIBLE && !mViewsToBeRemoved.contains(child)) { 111 return child; 112 } 113 } 114 return null; 115 } 116 117 @SuppressWarnings("unchecked") getChildOrNull(Class<E> clazz)118 public <E> E getChildOrNull(Class<E> clazz) { 119 for (int i = 0; i < getChildCount(); i++) { 120 View child = getChildAt(i); 121 if (clazz.isInstance(child) && !mViewsToBeRemoved.contains(child)) { 122 return (E) child; 123 } 124 } 125 return null; 126 } 127 128 @SuppressWarnings("unchecked") getVisibleChildOrNull(Class<E> clazz)129 public <E> E getVisibleChildOrNull(Class<E> clazz) { 130 for (int i = 0; i < getChildCount(); i++) { 131 View child = getChildAt(i); 132 if (clazz.isInstance(child) && !mViewsToBeRemoved.contains(child) 133 && child.getVisibility() == VISIBLE) { 134 return (E) child; 135 } 136 } 137 return null; 138 } 139 140 @Override getChildDrawingOrder(int childCount, int i)141 protected int getChildDrawingOrder(int childCount, int i) { 142 return indexOfChild(mOrderedChildren.get(i)); 143 } 144 } 145