Back to project page FloatingActionButton.
The source code is released under:
MIT License
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/* * Copyright (c) 2014 SBG Apps/*w w w . j a v a 2 s. c om*/ * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.faizmalkani.floatingactionbutton; import android.view.View; import android.widget.AbsListView; /** * Created by Stphane on 09/07/2014. */ class DirectionScrollListener implements AbsListView.OnScrollListener { private static final int DIRECTION_CHANGE_THRESHOLD = 1; private final FloatingActionButton mFloatingActionButton; private int mPrevPosition; private int mPrevTop; private boolean mUpdated; DirectionScrollListener(FloatingActionButton floatingActionButton) { mFloatingActionButton = floatingActionButton; } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { final View topChild = view.getChildAt(0); int firstViewTop = 0; if (topChild != null) { firstViewTop = topChild.getTop(); } boolean goingDown; boolean changed = true; if (mPrevPosition == firstVisibleItem) { final int topDelta = mPrevTop - firstViewTop; goingDown = firstViewTop < mPrevTop; changed = Math.abs(topDelta) > DIRECTION_CHANGE_THRESHOLD; } else { goingDown = firstVisibleItem > mPrevPosition; } if (changed && mUpdated) { mFloatingActionButton.hide(goingDown); } mPrevPosition = firstVisibleItem; mPrevTop = firstViewTop; mUpdated = true; } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } }