1 /* 2 * Copyright (C) 2015 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.tv.ui.sidepanel; 18 19 import android.support.annotation.UiThread; 20 import android.view.View; 21 import android.view.ViewGroup; 22 23 @UiThread 24 public abstract class Item { 25 private View mItemView; 26 private boolean mEnabled = true; 27 private boolean mClickable = true; 28 29 public void setEnabled(boolean enabled) { 30 if (mEnabled != enabled) { 31 mEnabled = enabled; 32 if (mItemView != null) { 33 setEnabledInternal(mItemView, enabled); 34 } 35 } 36 } 37 38 /** 39 * Sets the item to be clickable or not. 40 */ 41 public void setClickable(boolean clickable) { 42 mClickable = clickable; 43 if (mItemView != null) { 44 mItemView.setClickable(clickable); 45 } 46 } 47 48 /** 49 * Returns whether this item is enabled. 50 */ 51 public boolean isEnabled() { 52 return mEnabled; 53 } 54 55 public final void notifyUpdated() { 56 if (mItemView != null) { 57 onUpdate(); 58 } 59 } 60 61 protected abstract int getResourceId(); 62 63 protected void onBind(View view) { 64 mItemView = view; 65 } 66 67 protected void onUnbind() { 68 mItemView = null; 69 } 70 71 /** 72 * Called after onBind is called and when {@link #notifyUpdated} is called. 73 * {@link #notifyUpdated} is usually called by {@link SideFragment#notifyItemChanged} and 74 * {@link SideFragment#notifyItemsChanged}. 75 */ 76 protected void onUpdate() { 77 setEnabledInternal(mItemView, mEnabled); 78 mItemView.setClickable(mClickable); 79 } 80 81 protected abstract void onSelected(); 82 83 protected void onFocused() { 84 } 85 86 /** 87 * Returns true if the item is bound, i.e., onBind is called. 88 */ 89 protected boolean isBound() { 90 return mItemView != null; 91 } 92 93 private void setEnabledInternal(View view, boolean enabled) { 94 view.setEnabled(enabled); 95 if (view instanceof ViewGroup) { 96 ViewGroup parent = (ViewGroup) view; 97 int childCount = parent.getChildCount(); 98 for (int i = 0; i < childCount; ++i) { 99 setEnabledInternal(parent.getChildAt(i), enabled); 100 } 101 } 102 } 103 }