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 setEnabled(boolean enabled)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 /** Sets the item to be clickable or not. */ setClickable(boolean clickable)39 public void setClickable(boolean clickable) { 40 mClickable = clickable; 41 if (mItemView != null) { 42 mItemView.setClickable(clickable); 43 } 44 } 45 46 /** Returns whether this item is enabled. */ isEnabled()47 public boolean isEnabled() { 48 return mEnabled; 49 } 50 notifyUpdated()51 public final void notifyUpdated() { 52 if (mItemView != null) { 53 onUpdate(); 54 } 55 } 56 getResourceId()57 protected abstract int getResourceId(); 58 onBind(View view)59 protected void onBind(View view) { 60 mItemView = view; 61 } 62 onUnbind()63 protected void onUnbind() { 64 mItemView = null; 65 } 66 67 /** 68 * Called after onBind is called and when {@link #notifyUpdated} is called. {@link 69 * #notifyUpdated} is usually called by {@link SideFragment#notifyItemChanged} and {@link 70 * SideFragment#notifyItemsChanged}. 71 */ onUpdate()72 protected void onUpdate() { 73 setEnabledInternal(mItemView, mEnabled); 74 mItemView.setClickable(mClickable); 75 } 76 onSelected()77 protected abstract void onSelected(); 78 onFocused()79 protected void onFocused() {} 80 81 /** Returns true if the item is bound, i.e., onBind is called. */ isBound()82 protected boolean isBound() { 83 return mItemView != null; 84 } 85 setEnabledInternal(View view, boolean enabled)86 private void setEnabledInternal(View view, boolean enabled) { 87 view.setEnabled(enabled); 88 if (view instanceof ViewGroup) { 89 ViewGroup parent = (ViewGroup) view; 90 int childCount = parent.getChildCount(); 91 for (int i = 0; i < childCount; ++i) { 92 setEnabledInternal(parent.getChildAt(i), enabled); 93 } 94 } 95 } 96 } 97