package com.doumee.lib_coremodel.binding.viewadapter.viewpager;
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import androidx.databinding.BindingAdapter;
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import androidx.viewpager.widget.ViewPager;
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import com.doumee.lib_coremodel.binding.command.BindingCommand;
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/**
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* Created by goldze on 2017/6/18.
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*/
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public class ViewAdapter {
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@BindingAdapter(value = {"onPageScrolledCommand", "onPageSelectedCommand", "onPageScrollStateChangedCommand"}, requireAll = false)
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public static void onScrollChangeCommand(final ViewPager viewPager,
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final BindingCommand<ViewPagerDataWrapper> onPageScrolledCommand,
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final BindingCommand<Integer> onPageSelectedCommand,
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final BindingCommand<Integer> onPageScrollStateChangedCommand) {
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viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
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private int state;
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@Override
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public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
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if (onPageScrolledCommand != null) {
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onPageScrolledCommand.execute(new ViewPagerDataWrapper(position, positionOffset, positionOffsetPixels, state));
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}
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}
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@Override
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public void onPageSelected(int position) {
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if (onPageSelectedCommand != null) {
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onPageSelectedCommand.execute(position);
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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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this.state = state;
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if (onPageScrollStateChangedCommand != null) {
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onPageScrollStateChangedCommand.execute(state);
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}
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}
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});
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}
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public static class ViewPagerDataWrapper {
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public float positionOffset;
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public float position;
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public int positionOffsetPixels;
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public int state;
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public ViewPagerDataWrapper(float position, float positionOffset, int positionOffsetPixels, int state) {
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this.positionOffset = positionOffset;
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this.position = position;
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this.positionOffsetPixels = positionOffsetPixels;
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this.state = state;
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}
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}
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}
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