package com.haibin.oldcalendarview;
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import android.content.Context;
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import android.support.v4.view.ViewPager;
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import android.util.AttributeSet;
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import android.view.ViewGroup;
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/**
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* 这是一个自适应高度的View
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*/
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@SuppressWarnings("unused")
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public class WrapViewPager extends ViewPager {
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private int mNextViewHeight, mPreViewHeight, mCurrentViewHeight;
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private boolean isFirstInit = true;
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CalendarLayout mParentLayout;
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public WrapViewPager(Context context) {
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this(context, null);
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}
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public WrapViewPager(Context context, AttributeSet attrs) {
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super(context, attrs);
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addOnPageChangeListener(new OnPageChangeListener() {
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/**
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*
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* @param position position如果小于当前position，则代表往前一页滑动，否则为下一页
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* @param positionOffset 滑动比例
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* @param positionOffsetPixels 滑动像素
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*/
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@Override
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public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
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if (getTranslationY() != 0) {
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return;
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}
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int height;
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if (position < getCurrentItem()) {//右滑-1
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height = (int) ((mPreViewHeight)
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* (1 - positionOffset) +
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mCurrentViewHeight
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* positionOffset);
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} else {//左滑+！
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height = (int) ((mCurrentViewHeight)
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* (1 - positionOffset) +
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(mNextViewHeight)
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* positionOffset);
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}
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ViewGroup.LayoutParams params = getLayoutParams();
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params.height = height;
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setLayoutParams(params);
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}
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@Override
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public void onPageSelected(int position) {
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int year = position / 12 + CalendarView.mMinYear;
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int month = position % 12 + 1;
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mCurrentViewHeight = Util.getCardHeight(year, month);
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if (month == 1) {
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mNextViewHeight = Util.getCardHeight(year, month + 1);
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mPreViewHeight = Util.getCardHeight(year - 1, 12);
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} else {
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mPreViewHeight = Util.getCardHeight(year, month - 1);
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if (month == 12) {
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mNextViewHeight = Util.getCardHeight(year + 1, 1);
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} else {
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mNextViewHeight = Util.getCardHeight(year, month + 1);
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}
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}
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if (isFirstInit) {
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ViewGroup.LayoutParams params = getLayoutParams();
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params.height = mCurrentViewHeight;
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setLayoutParams(params);
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isFirstInit = false;
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}
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}
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@Override
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public void onPageScrollStateChanged(int state) {
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}
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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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heightMeasureSpec = MeasureSpec.makeMeasureSpec(Util.getCardHeight(0,0),MeasureSpec.EXACTLY);
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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}
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/**
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* ViewPager平移会调用这个方法
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*
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* @param y y
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* @param isFinish isFinish
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*/
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void onTranslate(int y, boolean isFinish) {
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}
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int getCurrentHeight() {
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return mCurrentViewHeight;
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}
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}
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