| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.calculator2; |
| |
| import android.content.Context; |
| import android.support.v4.view.PagerAdapter; |
| import android.support.v4.view.ViewPager; |
| import android.util.AttributeSet; |
| import android.view.View; |
| import android.view.ViewGroup; |
| |
| public class CalculatorPadViewPager extends ViewPager { |
| |
| private final PagerAdapter mStaticPagerAdapter = new PagerAdapter() { |
| @Override |
| public int getCount() { |
| return getChildCount(); |
| } |
| |
| @Override |
| public Object instantiateItem(ViewGroup container, int position) { |
| return getChildAt(position); |
| } |
| |
| @Override |
| public void destroyItem(ViewGroup container, int position, Object object) { |
| removeViewAt(position); |
| } |
| |
| @Override |
| public boolean isViewFromObject(View view, Object object) { |
| return view == object; |
| } |
| |
| @Override |
| public float getPageWidth(int position) { |
| return position == 1 ? 7.0f / 9.0f : 1.0f; |
| } |
| }; |
| |
| private final OnPageChangeListener mOnPageChangeListener = new SimpleOnPageChangeListener() { |
| private void recursivelySetEnabled(View view, boolean enabled) { |
| if (view instanceof ViewGroup) { |
| final ViewGroup viewGroup = (ViewGroup) view; |
| for (int childIndex = 0; childIndex < viewGroup.getChildCount(); ++childIndex) { |
| recursivelySetEnabled(viewGroup.getChildAt(childIndex), enabled); |
| } |
| } else { |
| view.setEnabled(enabled); |
| } |
| } |
| |
| @Override |
| public void onPageSelected(int position) { |
| if (getAdapter() == mStaticPagerAdapter) { |
| for (int childIndex = 0; childIndex < getChildCount(); ++childIndex) { |
| // Only enable subviews of the current page. |
| recursivelySetEnabled(getChildAt(childIndex), childIndex == position); |
| } |
| } |
| } |
| }; |
| |
| private final PageTransformer mPageTransformer = new PageTransformer() { |
| @Override |
| public void transformPage(View view, float position) { |
| if (position < 0.0f) { |
| // Pin the left page to the left side. |
| view.setTranslationX(getWidth() * -position); |
| view.setAlpha(Math.max(1.0f + position, 0.0f)); |
| } else { |
| // Use the default slide transition when moving to the next page. |
| view.setTranslationX(0.0f); |
| view.setAlpha(1.0f); |
| } |
| } |
| }; |
| |
| public CalculatorPadViewPager(Context context) { |
| this(context, null); |
| } |
| |
| public CalculatorPadViewPager(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| |
| setAdapter(mStaticPagerAdapter); |
| setBackgroundColor(getResources().getColor(android.R.color.black)); |
| setOnPageChangeListener(mOnPageChangeListener); |
| setPageMargin(getResources().getDimensionPixelSize(R.dimen.pad_page_margin)); |
| setPageTransformer(false, mPageTransformer); |
| } |
| |
| @Override |
| protected void onFinishInflate() { |
| super.onFinishInflate(); |
| |
| // Invalidate the adapter's data set since children may have been added during inflation. |
| if (getAdapter() == mStaticPagerAdapter) { |
| mStaticPagerAdapter.notifyDataSetChanged(); |
| } |
| } |
| } |