示例#1
0
 public static boolean isChildInCenterY(RecyclerView recyclerView, View view) {
   int childCount = recyclerView.getChildCount();
   int[] rvLocationOnScreen = new int[2];
   int[] vLocationOnScreen = new int[2];
   recyclerView.getLocationOnScreen(rvLocationOnScreen);
   int middleY =
       (int) (rvLocationOnScreen[1] + recyclerView.getHeight() * recyclerView.getScaleY() / 2);
   if (childCount > 0) {
     view.getLocationOnScreen(vLocationOnScreen);
     if (vLocationOnScreen[1] <= middleY
         && vLocationOnScreen[1] + view.getHeight() * view.getScaleY() >= middleY) {
       return true;
     }
   }
   return false;
 }
示例#2
0
 public static boolean isChildInCenterX(RecyclerView recyclerView, View view) {
   int childCount = recyclerView.getChildCount();
   int[] lvLocationOnScreen = new int[2];
   int[] vLocationOnScreen = new int[2];
   recyclerView.getLocationOnScreen(lvLocationOnScreen);
   int middleX =
       (int) (lvLocationOnScreen[0] + recyclerView.getWidth() * recyclerView.getScaleX() / 2);
   if (childCount > 0) {
     view.getLocationOnScreen(vLocationOnScreen);
     if (vLocationOnScreen[0] <= middleX
         && vLocationOnScreen[0] + view.getWidth() * view.getScaleX() >= middleX) {
       return true;
     }
   }
   return false;
 }
示例#3
0
  /** 滑动开始准备 */
  private void actionDown(MotionEvent motionEvent) {
    if (mPaused) {
      return;
    }

    // 找到被点击的 view 和位置(包括 top left right bottom)
    Rect rect = new Rect();
    int childCount = mRecyclerView.getChildCount();
    // location 指的是 RecyclerView 左上角以整个屏幕的左上角为参照物的坐标
    int[] location = new int[2];
    mRecyclerView.getLocationOnScreen(location);
    // 此处的 x y 指的是触摸点以 location 为参照物时的坐标
    int x = (int) motionEvent.getRawX() - location[0];
    int y = (int) motionEvent.getRawY() - location[1];
    View child;
    for (int i = 0; i < childCount; i++) {
      child = mRecyclerView.getChildAt(i);
      child.getHitRect(rect);
      if (rect.contains(x, y)) {
        mDownView = child;
        break;
      }
    }

    // 找到相应的 view 并且该 view 不处于执行动画状态
    if (mDownView != null
        && mAnimatingPosition != mRecyclerView.getChildAdapterPosition(mDownView)) {
      mAlpha = mDownView.getAlpha();
      mDownX = motionEvent.getRawX();
      mDownY = motionEvent.getRawY();
      mDownPosition = mRecyclerView.getChildAdapterPosition(mDownView);
      if (mSwipeListener.canSwipe(mDownPosition)) {
        // ?添加速度追踪器
        mVelocityTracker = VelocityTracker.obtain();
        mVelocityTracker.addMovement(motionEvent);
      } else {
        mDownView = null;
      }
    }
  }
  private boolean handleTouchEvent(MotionEvent motionEvent) {
    if (mViewWidth < 2) {
      mViewWidth = mRecyclerView.getWidth();
    }

    switch (motionEvent.getActionMasked()) {
      case MotionEvent.ACTION_DOWN:
        {
          if (mPaused) {
            break;
          }

          // Find the child view that was touched (perform a hit test)
          Rect rect = new Rect();
          int childCount = mRecyclerView.getChildCount();
          int[] listViewCoords = new int[2];
          mRecyclerView.getLocationOnScreen(listViewCoords);
          int x = (int) motionEvent.getRawX() - listViewCoords[0];
          int y = (int) motionEvent.getRawY() - listViewCoords[1];
          View child;
          for (int i = 0; i < childCount; i++) {
            child = mRecyclerView.getChildAt(i);
            child.getHitRect(rect);
            if (rect.contains(x, y)) {
              mDownView = child;
              break;
            }
          }

          if (mDownView != null) {
            mDownX = motionEvent.getRawX();
            mDownY = motionEvent.getRawY();
            mDownPosition = mRecyclerView.getChildAdapterPosition(mDownView);
            mVelocityTracker = VelocityTracker.obtain();
            mVelocityTracker.addMovement(motionEvent);
            mFgView = mDownView.findViewById(mFgID);
          }
          break;
        }

      case MotionEvent.ACTION_CANCEL:
        {
          if (mVelocityTracker == null) {
            break;
          }

          if (mDownView != null && mSwiping) {
            // cancel
            mFgView.animate().translationX(0).setDuration(ANIMATION_FAST).setListener(null);
          }
          mVelocityTracker.recycle();
          mVelocityTracker = null;
          mDownX = 0;
          mDownY = 0;
          mDownView = null;
          mDownPosition = ListView.INVALID_POSITION;
          mSwiping = false;
          mBgView = null;
          break;
        }

      case MotionEvent.ACTION_UP:
        {
          if (mVelocityTracker == null) {
            break;
          }

          mFinalDelta = motionEvent.getRawX() - mDownX;
          mVelocityTracker.addMovement(motionEvent);
          mVelocityTracker.computeCurrentVelocity(1000);
          float velocityX = mVelocityTracker.getXVelocity();
          float absVelocityX = Math.abs(velocityX);
          float absVelocityY = Math.abs(mVelocityTracker.getYVelocity());
          boolean dismiss = false;
          boolean dismissRight = false;
          if (Math.abs(mFinalDelta) > mViewWidth / 2 && mSwiping) {
            dismiss = true;
            dismissRight = mFinalDelta > 0;
          } else if (mMinFlingVelocity <= absVelocityX
              && absVelocityX <= mMaxFlingVelocity
              && absVelocityY < absVelocityX
              && mSwiping) {
            // dismiss only if flinging in the same direction as dragging
            dismiss = (velocityX < 0) == (mFinalDelta < 0);
            dismissRight = mVelocityTracker.getXVelocity() > 0;
          }
          if (dismiss
              && mDownPosition != ListView.INVALID_POSITION
              && mSwipeListener.canSwipe(mDownPosition)) {
            // dismiss
            ++mDismissAnimationRefCount;
            mBgView.animate().alpha(1).setDuration(ANIMATION_FAST);
            mFgView
                .animate()
                .translationX(dismissRight ? mViewWidth : -mViewWidth)
                .setDuration(ANIMATION_FAST)
                .setListener(
                    new AnimatorListenerAdapter() {
                      @Override
                      public void onAnimationEnd(Animator animation) {
                        mFgView.animate().translationX(0); // Esto hace que regrese a su posision :)
                      }
                    });
          } else {
            // cancel
            mFgView.animate().translationX(0).setDuration(ANIMATION_FAST).setListener(null);
          }
          mVelocityTracker.recycle();
          mVelocityTracker = null;
          mDownX = 0;
          mDownY = 0;
          mDownView = null;
          mDownPosition = ListView.INVALID_POSITION;
          mSwiping = false;
          mBgView = null;
          break;
        }

      case MotionEvent.ACTION_MOVE:
        {
          if (mVelocityTracker == null || mPaused) {
            break;
          }

          mVelocityTracker.addMovement(motionEvent);
          float deltaX = motionEvent.getRawX() - mDownX;
          float deltaY = motionEvent.getRawY() - mDownY;
          if (!mSwiping && Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) {
            mSwiping = true;
            mSwipingSlop = (deltaX > 0 ? mSlop : -mSlop);
          }

          if (mSwiping) {
            if (mBgView == null) {
              mBgView = mDownView.findViewById(mBgID);
              mBgView.setVisibility(View.VISIBLE);
              listener.holaView((deltaX - mSwipingSlop) > 0, mBgView);
            }
            mFgView.setTranslationX(deltaX - mSwipingSlop);
            return true;
          }
          break;
        }
    }

    return false;
  }
  @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
  private boolean handleTouchEvent(MotionEvent motionEvent) {
    if (mViewWidth < 2) {
      mViewWidth = mRecyclerView.getWidth();
    }

    switch (motionEvent.getActionMasked()) {
      case MotionEvent.ACTION_DOWN:
        {
          if (mPaused) {
            break;
          }

          // Find the child view that was touched (perform a hit test)
          Rect rect = new Rect();
          int childCount = mRecyclerView.getChildCount();
          int[] listViewCoords = new int[2];
          mRecyclerView.getLocationOnScreen(listViewCoords);
          int x = (int) motionEvent.getRawX() - listViewCoords[0];
          int y = (int) motionEvent.getRawY() - listViewCoords[1];
          View child;
          for (int i = 0; i < childCount; i++) {
            child = mRecyclerView.getChildAt(i);
            child.getHitRect(rect);
            if (rect.contains(x, y)) {
              mDownView = child;
              break;
            }
          }

          if (mDownView != null
              && mAnimatingPosition != mRecyclerView.getChildPosition(mDownView)) {
            mAlpha = mDownView.getAlpha();
            mDownX = motionEvent.getRawX();
            mDownY = motionEvent.getRawY();
            mDownPosition = mRecyclerView.getChildPosition(mDownView);
            if (mSwipeListener.canSwipe(mDownPosition)) {
              mVelocityTracker = VelocityTracker.obtain();
              mVelocityTracker.addMovement(motionEvent);
            } else {
              mDownView = null;
            }
          }
          break;
        }

      case MotionEvent.ACTION_CANCEL:
        {
          if (mVelocityTracker == null) {
            break;
          }

          if (mDownView != null && mSwiping) {
            // cancel
            mDownView
                .animate()
                .translationX(0)
                .alpha(mAlpha)
                .setDuration(mAnimationTime)
                .setListener(null);
          }
          mVelocityTracker.recycle();
          mVelocityTracker = null;
          mDownX = 0;
          mDownY = 0;
          mDownView = null;
          mDownPosition = ListView.INVALID_POSITION;
          mSwiping = false;
          break;
        }

      case MotionEvent.ACTION_UP:
        {
          if (mVelocityTracker == null) {
            break;
          }

          mFinalDelta = motionEvent.getRawX() - mDownX;
          mVelocityTracker.addMovement(motionEvent);
          mVelocityTracker.computeCurrentVelocity(1000);
          float velocityX = mVelocityTracker.getXVelocity();
          float absVelocityX = Math.abs(velocityX);
          float absVelocityY = Math.abs(mVelocityTracker.getYVelocity());
          boolean dismiss = false;
          boolean dismissRight = false;
          if (Math.abs(mFinalDelta) > mViewWidth / 2 && mSwiping) {
            dismiss = true;
            dismissRight = mFinalDelta > 0;
          } else if (mMinFlingVelocity <= absVelocityX
              && absVelocityX <= mMaxFlingVelocity
              && absVelocityY < absVelocityX
              && mSwiping) {
            // dismiss only if flinging in the same direction as dragging
            dismiss = (velocityX < 0) == (mFinalDelta < 0);
            dismissRight = mVelocityTracker.getXVelocity() > 0;
          }
          if (dismiss
              && mDownPosition != mAnimatingPosition
              && mDownPosition != ListView.INVALID_POSITION) {
            // dismiss
            final View downView = mDownView; // mDownView gets null'd before animation ends
            final int downPosition = mDownPosition;
            ++mDismissAnimationRefCount;
            mAnimatingPosition = mDownPosition;
            mDownView
                .animate()
                .translationX(dismissRight ? mViewWidth : -mViewWidth)
                .alpha(0)
                .setDuration(mAnimationTime)
                .setListener(
                    new AnimatorListenerAdapter() {
                      @Override
                      public void onAnimationEnd(Animator animation) {
                        performDismiss(downView, downPosition);
                      }
                    });
          } else {
            // cancel
            mDownView
                .animate()
                .translationX(0)
                .alpha(mAlpha)
                .setDuration(mAnimationTime)
                .setListener(null);
          }
          mVelocityTracker.recycle();
          mVelocityTracker = null;
          mDownX = 0;
          mDownY = 0;
          mDownView = null;
          mDownPosition = ListView.INVALID_POSITION;
          mSwiping = false;
          break;
        }

      case MotionEvent.ACTION_MOVE:
        {
          if (mVelocityTracker == null || mPaused) {
            break;
          }

          mVelocityTracker.addMovement(motionEvent);
          float deltaX = motionEvent.getRawX() - mDownX;
          float deltaY = motionEvent.getRawY() - mDownY;
          if (!mSwiping && Math.abs(deltaX) > mSlop && Math.abs(deltaY) < Math.abs(deltaX) / 2) {
            mSwiping = true;
            mSwipingSlop = (deltaX > 0 ? mSlop : -mSlop);
          }

          if (mSwiping) {
            mDownView.setTranslationX(deltaX - mSwipingSlop);
            mDownView.setAlpha(
                Math.max(0f, Math.min(mAlpha, mAlpha * (1f - Math.abs(deltaX) / mViewWidth))));
            return true;
          }
          break;
        }
    }

    return false;
  }