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.tv.settings.connectivity; 18 19 import android.content.Context; 20 import android.support.v7.preference.PreferenceCategory; 21 import android.util.AttributeSet; 22 23 public class CollapsibleCategory extends PreferenceCategory { 24 25 private static final int COLLAPSED_ITEM_COUNT = 3; 26 27 private boolean mCollapsed = true; 28 CollapsibleCategory(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)29 public CollapsibleCategory(Context context, AttributeSet attrs, int defStyleAttr, 30 int defStyleRes) { 31 super(context, attrs, defStyleAttr, defStyleRes); 32 } 33 CollapsibleCategory(Context context, AttributeSet attrs, int defStyleAttr)34 public CollapsibleCategory(Context context, AttributeSet attrs, int defStyleAttr) { 35 super(context, attrs, defStyleAttr); 36 } 37 CollapsibleCategory(Context context, AttributeSet attrs)38 public CollapsibleCategory(Context context, AttributeSet attrs) { 39 super(context, attrs); 40 } 41 CollapsibleCategory(Context context)42 public CollapsibleCategory(Context context) { 43 super(context); 44 } 45 46 @Override getPreferenceCount()47 public int getPreferenceCount() { 48 if (mCollapsed && shouldShowCollapsePref()) { 49 return COLLAPSED_ITEM_COUNT; 50 } else { 51 return super.getPreferenceCount(); 52 } 53 } 54 getRealPreferenceCount()55 public int getRealPreferenceCount() { 56 return super.getPreferenceCount(); 57 } 58 59 /** 60 * Only show the collapse preference if the list would be longer than the collapsed list 61 * plus the collapse preference itself. 62 * 63 * @return true if collapse pref should be shown 64 */ shouldShowCollapsePref()65 public boolean shouldShowCollapsePref() { 66 return super.getPreferenceCount() >= COLLAPSED_ITEM_COUNT + 1; 67 } 68 isCollapsed()69 public boolean isCollapsed() { 70 return mCollapsed; 71 } 72 setCollapsed(boolean collapsed)73 public void setCollapsed(boolean collapsed) { 74 mCollapsed = collapsed; 75 notifyHierarchyChanged(); 76 } 77 } 78