package cc.shinichi.library.view.helper;
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import android.animation.Animator;
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import android.animation.ValueAnimator;
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import android.annotation.SuppressLint;
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import android.app.Activity;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.animation.LinearInterpolator;
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import android.widget.RelativeLayout;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import cc.shinichi.library.ImagePreview;
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import cc.shinichi.library.view.nine.ViewHelper;
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import cc.shinichi.library.view.photoview.PhotoView;
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import cc.shinichi.library.view.subsampling.SubsamplingScaleImageView;
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/**
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* @author 工藤
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* @email qinglingou@gmail.com
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* create at 2018/10/19 11:22
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* description:辅助下拉关闭图片
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*/
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public class DragCloseView extends RelativeLayout {
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private static final String TAG = DragCloseView.class.getSimpleName();
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private final static int MAX_EXIT_Y = 500;
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private final static long DURATION = 200;
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private SubsamplingScaleImageView imageStatic;
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private PhotoView imageAnime;
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private View videoView;
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private float mDownX;
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private float mDownY;
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private float mTranslationY;
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private onAlphaChangedListener mOnAlphaChangedListener;
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public DragCloseView(Context context) {
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this(context, null);
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}
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public DragCloseView(Context context, @Nullable AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public DragCloseView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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}
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@Override
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protected void onFinishInflate() {
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super.onFinishInflate();
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imageStatic = (SubsamplingScaleImageView) getChildAt(0);
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imageAnime = (PhotoView) getChildAt(1);
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videoView = getChildAt(2);
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}
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@Override
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public boolean onInterceptTouchEvent(MotionEvent ev) {
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if (ImagePreview.Companion.getInstance().isEnableDragClose()) {
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int action = ev.getActionMasked();
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if (action == MotionEvent.ACTION_DOWN) {
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mDownX = ev.getRawX();
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mDownY = ev.getRawY();
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} else if (action == MotionEvent.ACTION_MOVE) {
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return canInterceptDrag(ev);
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}
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}
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return false;
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}
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private boolean canInterceptDrag(MotionEvent ev) {
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float diffX = Math.abs(ev.getX() - mDownX);
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float diffY = Math.abs(ev.getY() - mDownY);
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if (diffY <= diffX) {
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// 下拉手势，Y 轴位移小于 X 轴位移，是横向滑动，不拦截
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return false;
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}
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getParent().requestDisallowInterceptTouchEvent(true);
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if (imageStatic != null && imageStatic.getVisibility() == View.VISIBLE) {
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// 静图
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boolean isAtEdge = ImagePreview.Companion.getInstance().isEnableDragCloseIgnoreScale()
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? imageStatic.getScale() <= (imageStatic.getMinScale() + 0.001F) || imageStatic.isAtYEdge()
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: imageStatic.getScale() <= (imageStatic.getMinScale() + 0.001F) && imageStatic.isAtYEdge();
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return isAtEdge && (imageStatic.getMaxTouchCount() == 0 || imageStatic.getMaxTouchCount() == 1);
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} else if (imageAnime != null && imageAnime.getVisibility() == View.VISIBLE) {
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// 动图
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return imageAnime.getScale() <= (imageAnime.getMinimumScale() + 0.001F) && (imageAnime.getMaxTouchCount() == 0 || imageAnime.getMaxTouchCount() == 1);
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} else if (videoView != null && videoView.getVisibility() == View.VISIBLE) {
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// 视频
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return true;
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}
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return false;
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}
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@SuppressLint("ClickableViewAccessibility")
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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int action = event.getAction() & event.getActionMasked();
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switch (action) {
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case MotionEvent.ACTION_DOWN:
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mDownX = event.getRawX();
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mDownY = event.getRawY();
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case MotionEvent.ACTION_MOVE:
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if (ImagePreview.Companion.getInstance().isEnableDragClose()) {
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if ((imageAnime != null && imageAnime.getVisibility() == View.VISIBLE)
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|| (imageStatic != null && imageStatic.getVisibility() == View.VISIBLE)
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|| (videoView != null && videoView.getVisibility() == View.VISIBLE)
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) {
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onOneFingerPanActionMove(event);
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}
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}
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break;
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case MotionEvent.ACTION_UP:
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onActionUp();
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break;
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default:
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break;
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}
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return true;
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}
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/**
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* 处理拖拽事件
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*
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* @param event
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*/
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private void onOneFingerPanActionMove(MotionEvent event) {
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float moveY = event.getRawY();
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mTranslationY = moveY - mDownY;
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if (mOnAlphaChangedListener != null) {
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mOnAlphaChangedListener.onTranslationYChanged(event, mTranslationY);
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}
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setTranslationY(mTranslationY);
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}
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private void onActionUp() {
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// 是否启用上拉关闭
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boolean enableUpDragClose = ImagePreview.Companion.getInstance().isEnableUpDragClose();
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if (enableUpDragClose) {
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if (Math.abs(mTranslationY) > MAX_EXIT_Y) {
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if (null != mOnAlphaChangedListener) {
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mOnAlphaChangedListener.onExit();
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}
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exit();
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} else {
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resetCallBackAnimation();
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}
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} else {
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if (mTranslationY > MAX_EXIT_Y) {
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if (null != mOnAlphaChangedListener) {
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mOnAlphaChangedListener.onExit();
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}
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exit();
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} else {
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resetCallBackAnimation();
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}
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}
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}
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private void resetCallBackAnimation() {
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ValueAnimator animatorY = ValueAnimator.ofFloat(mTranslationY, 0);
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animatorY.setDuration(DURATION);
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animatorY.addUpdateListener(animation -> {
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mTranslationY = (float) animation.getAnimatedValue();
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setTranslationY(mTranslationY);
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});
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animatorY.addListener(new SimpleAnimatorListener() {
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@Override
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public void onAnimationEnd(@NonNull Animator animation) {
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mTranslationY = 0;
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reset();
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}
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});
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animatorY.start();
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}
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private void exit() {
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ValueAnimator animatorExit;
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if (mTranslationY > 0) {
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animatorExit = ValueAnimator.ofFloat(mTranslationY, getHeight());
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} else {
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animatorExit = ValueAnimator.ofFloat(mTranslationY, -getHeight());
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}
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animatorExit.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
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@Override
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public void onAnimationUpdate(@NonNull ValueAnimator animation) {
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float fraction = (float) animation.getAnimatedValue();
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ViewHelper.setScrollY(DragCloseView.this, -(int) fraction);
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}
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});
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animatorExit.addListener(new Animator.AnimatorListener() {
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@Override
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public void onAnimationStart(@NonNull Animator animation) {
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}
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@Override
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public void onAnimationEnd(@NonNull Animator animation) {
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((Activity) getContext()).finish();
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}
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@Override
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public void onAnimationCancel(@NonNull Animator animation) {
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}
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@Override
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public void onAnimationRepeat(@NonNull Animator animation) {
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}
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});
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animatorExit.setDuration(DURATION);
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animatorExit.setInterpolator(new LinearInterpolator());
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animatorExit.start();
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}
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/**
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* 暴露的回调方法（可根据位移距离或者alpha来改变主UI控件的透明度等
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*/
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public void setOnAlphaChangeListener(onAlphaChangedListener alphaChangeListener) {
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mOnAlphaChangedListener = alphaChangeListener;
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}
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private void reset() {
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if (null != mOnAlphaChangedListener) {
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mOnAlphaChangedListener.onTranslationYChanged(null, mTranslationY);
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}
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}
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public abstract static class SimpleAnimatorListener implements Animator.AnimatorListener {
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@Override
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public void onAnimationStart(@NonNull Animator animation) {
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}
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@Override
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public void onAnimationCancel(@NonNull Animator animation) {
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}
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@Override
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public void onAnimationRepeat(@NonNull Animator animation) {
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}
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}
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public interface onAlphaChangedListener {
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void onTranslationYChanged(MotionEvent event, float translationY);
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void onExit();
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}
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}
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