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/*
* Copyright (C) 2015 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.graphics.Color;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
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 View 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() {
@Override
public void onPageSelected(int position) {
for (int i = getChildCount() - 1; i >= 0; --i) {
getChildAt(i).setImportantForAccessibility(i == position
? IMPORTANT_FOR_ACCESSIBILITY_AUTO
: IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS) ;
}
}
};
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 /* attrs */);
}
public CalculatorPadViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
setAdapter(mStaticPagerAdapter);
setBackgroundColor(Color.BLACK);
setPageMargin(getResources().getDimensionPixelSize(R.dimen.pad_page_margin));
setPageTransformer(false, mPageTransformer);
addOnPageChangeListener(mOnPageChangeListener);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
// Invalidate the adapter's data set since children may have been added during inflation.
getAdapter().notifyDataSetChanged();
// Let page change listener know about our initial position.
mOnPageChangeListener.onPageSelected(getCurrentItem());
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
boolean shouldIntercept = super.onInterceptTouchEvent(ev);
// Only allow the current item to receive touch events.
if (!shouldIntercept && ev.getActionMasked() == MotionEvent.ACTION_DOWN) {
final int x = (int) ev.getX() + getScrollX();
final int y = (int) ev.getY() + getScrollY();
final int childCount = getChildCount();
for (int i = childCount - 1; i >= 0; --i) {
final int childIndex = getChildDrawingOrder(childCount, i);
final View child = getChildAt(childIndex);
if (child.getVisibility() == View.VISIBLE
&& x >= child.getLeft() && x < child.getRight()
&& y >= child.getTop() && y < child.getBottom()) {
shouldIntercept = (childIndex != getCurrentItem());
break;
}
}
}
return shouldIntercept;
}
}
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