/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under the
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* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package com.android.systemui.qs;
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import android.annotation.Nullable;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.database.DataSetObserver;
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import android.os.Handler;
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import android.util.AttributeSet;
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import android.view.View;
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import android.widget.LinearLayout;
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import android.widget.ListAdapter;
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import com.android.systemui.R;
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/**
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* Similar to a ListView, but it will show only as many items as fit on screen and
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* bind those instead of scrolling.
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*/
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public class AutoSizingList extends LinearLayout {
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private static final String TAG = "AutoSizingList";
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private final int mItemSize;
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private final Handler mHandler;
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private ListAdapter mAdapter;
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private int mCount;
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private boolean mEnableAutoSizing;
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public AutoSizingList(Context context, @Nullable AttributeSet attrs) {
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super(context, attrs);
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mHandler = new Handler();
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AutoSizingList);
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mItemSize = a.getDimensionPixelSize(R.styleable.AutoSizingList_itemHeight, 0);
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mEnableAutoSizing = a.getBoolean(R.styleable.AutoSizingList_enableAutoSizing, true);
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a.recycle();
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}
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public void setAdapter(ListAdapter adapter) {
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if (mAdapter != null) {
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mAdapter.unregisterDataSetObserver(mDataObserver);
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}
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mAdapter = adapter;
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if (adapter != null) {
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adapter.registerDataSetObserver(mDataObserver);
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}
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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int requestedHeight = MeasureSpec.getSize(heightMeasureSpec);
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if (requestedHeight != 0) {
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int count = getItemCount(requestedHeight);
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if (mCount != count) {
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postRebindChildren();
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mCount = count;
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}
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}
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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}
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private int getItemCount(int requestedHeight) {
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int desiredCount = getDesiredCount();
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return mEnableAutoSizing ? Math.min(requestedHeight / mItemSize, desiredCount)
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: desiredCount;
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}
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private int getDesiredCount() {
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return mAdapter != null ? mAdapter.getCount() : 0;
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}
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private void postRebindChildren() {
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mHandler.post(mBindChildren);
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}
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private void rebindChildren() {
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if (mAdapter == null) {
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return;
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}
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for (int i = 0; i < mCount; i++) {
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View v = i < getChildCount() ? getChildAt(i) : null;
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View newView = mAdapter.getView(i, v, this);
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if (newView != v) {
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if (v != null) {
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removeView(v);
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}
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addView(newView, i);
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}
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}
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// Ditch extra views.
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while (getChildCount() > mCount) {
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removeViewAt(getChildCount() - 1);
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}
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}
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private final Runnable mBindChildren = new Runnable() {
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@Override
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public void run() {
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rebindChildren();
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}
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};
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private final DataSetObserver mDataObserver = new DataSetObserver() {
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@Override
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public void onChanged() {
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if (mCount > getDesiredCount()) {
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mCount = getDesiredCount();
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}
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postRebindChildren();
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}
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@Override
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public void onInvalidated() {
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postRebindChildren();
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}
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};
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}
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