package com.doumee.lib_coremodel.base;
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import android.os.Bundle;
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import android.view.View;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.databinding.ViewDataBinding;
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import androidx.fragment.app.Fragment;
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/**
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* 懒加载Fragment
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* @author <a href="mailto:jenly1314@gmail.com">Jenly</a>
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*/
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public abstract class BaseLazyFragment<VM extends BaseViewModel,VDB extends ViewDataBinding> extends BaseFragment<VM,VDB> {
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/**
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* 是否可见
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*/
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private boolean isVisible;
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/**
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* 是否初次加载
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*/
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private boolean isFirstLoad;
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/**
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* 是否准备好加载
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*/
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private boolean isPrepared;
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@Override
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public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
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isFirstLoad = true;
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super.onViewCreated(view, savedInstanceState);
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isPrepared = true;
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}
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@Override
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public void onResume() {
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super.onResume();
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lazyLoad();
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}
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/**
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* {@link Fragment}可见
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*/
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private void onVisible(){
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isVisible = true;
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lazyLoad();
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}
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/**
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* {@link Fragment}不可见
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*/
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private void onInvisible(){
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isVisible = false;
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}
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@Override
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public void onHiddenChanged(boolean hidden) {
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super.onHiddenChanged(hidden);
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if(hidden){
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onInvisible();
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}else{
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onVisible();
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}
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}
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@Override
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public void setUserVisibleHint(boolean isVisibleToUser) {
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super.setUserVisibleHint(isVisibleToUser);
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if(isVisibleToUser){
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onVisible();
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}else{
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onInvisible();
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}
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}
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/**
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* 懒加载，触发{@link #onLazyLoad()}
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*/
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private void lazyLoad(){
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if(isFirstLoad && isPrepared && isVisible){
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//保证只加载一次
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isFirstLoad = false;
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onLazyLoad();
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}
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}
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/**
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* 懒加载
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*/
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public abstract void onLazyLoad();
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}
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