pocketcommunityclient/app/src/main/java/com/community/pocket/ui/main/ui/forum/main/ForumFragment.java

package com.community.pocket.ui.main.ui.forum.main;

import android.annotation.SuppressLint;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.core.widget.NestedScrollView;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModelProvider;

import com.community.pocket.R;
import com.community.pocket.data.adapter.NoticeAdpter;
import com.community.pocket.data.model.Notice;
import com.community.pocket.ui.main.MainFragment;
import com.community.pocket.ui.main.ui.share.Response;
import com.youth.banner.indicator.RectangleIndicator;

import org.xutils.view.annotation.ContentView;
import org.xutils.view.annotation.Event;
import org.xutils.view.annotation.ViewInject;

import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * 论坛框架
 */
@ContentView(R.layout.forum)
public class ForumFragment extends MainFragment {

    @ViewInject(R.id.paper)
    private MyBanner banner;

    @ViewInject(R.id.scroll_body)
    private NestedScrollView scrollView;

    @ViewInject(R.id.forum_new)
    private Button newButton;

    @ViewInject(R.id.notice_prev)
    private ImageView noticePrev;
    @ViewInject(R.id.notice_next)
    private ImageView noticeNext;

    //触发自动滚动
    private MutableLiveData<Boolean> autoScroll = new MutableLiveData<>();

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        ForumViewModel viewModel = new ViewModelProvider(this, new ViewModelProvider.NewInstanceFactory()).get(ForumViewModel.class);

        viewModel.loadNotice();

        newButton.setOnClickListener(this::_new);

        //监控公告信息请求状态
        viewModel.getNoticeDataResponse().observe(getViewLifecycleOwner(), forumNoticeResponse -> {
            if (forumNoticeResponse == null) {
                return;
            }

            forumNoticeResponse.toast(getContext());

            if (forumNoticeResponse.getResult() == Response.Result.OK) {
                initNotice(forumNoticeResponse.getNoticeList());
            }
        });

        resumeAutoScroll();
    }

    //初始化公告箭头事件
    private void initArrow() {
        initFocusListener(noticePrev);
        initFocusListener(noticeNext);
        initClickListener(noticePrev);
        initClickListener(noticeNext);
    }

    public NestedScrollView getScrollView() {
        return scrollView;
    }

    //箭头随焦点改变透明度
    @SuppressLint("ClickableViewAccessibility")
    private void initFocusListener(ImageView imageView) {
        imageView.setOnTouchListener((v, event) -> {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    v.setAlpha(1);
                    break;
                case MotionEvent.ACTION_UP:
                    v.setAlpha(0.1f);
                    break;
            }
            return false;
        });
    }

    //箭头点击事件
    private void initClickListener(ImageView imageView) {
        imageView.setOnClickListener(v -> {
            if (imageView == noticePrev) {
                banner.setCurrentItem(banner.getCurrentItem() > 0 ? banner.getCurrentItem() - 1 : banner.getItemCount() - 1);
            } else {
                banner.setCurrentItem(banner.getCurrentItem() < banner.getItemCount() - 1 ? banner.getCurrentItem() + 1 : 0);
            }
            new Thread(() -> {
                try {
                    TimeUnit.SECONDS.sleep(3);
                    autoScroll.postValue(true);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                    Log.e(ForumFragment.class.getName(), e.toString());
                }
            }).start();
        });
    }

    //恢复自动滚动
    private void resumeAutoScroll() {
        this.autoScroll.observe(getViewLifecycleOwner(), aBoolean -> {
            if (aBoolean) {
                banner.start();
            }
        });
    }

    //加载公告信息
    private void initNotice(final List<Notice> notices) {

        banner.setAdapter(new NoticeAdpter(notices));
        banner.setIndicator(new RectangleIndicator(getContext()));
        banner.setIndicatorWidth(100, 200);
        banner.setIndicatorNormalColor(getResources().getColor(R.color.colorAccent));
        banner.setIndicatorSelectedColor(getResources().getColor(R.color.colorBlack));

        if (notices.size() >= 2) {
            noticePrev.setVisibility(View.VISIBLE);
            noticeNext.setVisibility(View.VISIBLE);
        } else {
            noticePrev.setVisibility(View.GONE);
            noticeNext.setVisibility(View.GONE);
        }

        initArrow();
    }

    private void scrollTop() {
        scrollView.fling(0);
        scrollView.smoothScrollTo(0, 0);
    }


    //跳转热榜界面
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    @Event(value = R.id.forum_hot)
    private void hot(View view) {
        scrollTop();
        ctrl().navigate(R.id.forumHotFragment);
        changeColor(view);
    }

    //跳转最新界面
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    public void _new(View view) {
        scrollTop();
        ctrl().navigate(R.id.forumNewFragment);
        changeColor(view);
    }


    //跳转发帖界面
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    @Event(value = R.id.forum_post)
    private void post(View view) {
        scrollTop();
        ctrl().navigate(R.id.forumPostFragment);
        changeColor(view);
    }

    //跳转我的帖子界面
    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    @Event(value = R.id.forum_my)
    private void my(View view) {
        scrollTop();
        ctrl().navigate(R.id.forumMyFragment);
        changeColor(view);
    }

    @Override
    protected int fragmentId() {
        return R.id.fragment;
    }

    @Override
    protected int[] button_ids() {
        return new int[]{R.id.forum_hot, R.id.forum_new, R.id.forum_post, R.id.forum_my};
    }
}