| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * 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.android.launcher3; |
| |
| import android.support.v4.widget.AutoScrollHelper; |
| import android.widget.ScrollView; |
| |
| /** |
| * An implementation of {@link AutoScrollHelper} that knows how to scroll |
| * through a {@link Folder}. |
| */ |
| public class FolderAutoScrollHelper extends AutoScrollHelper { |
| private static final float MAX_SCROLL_VELOCITY = 1500f; |
| |
| private final ScrollView mTarget; |
| |
| public FolderAutoScrollHelper(ScrollView target) { |
| super(target); |
| |
| mTarget = target; |
| |
| setActivationDelay(0); |
| setEdgeType(EDGE_TYPE_INSIDE_EXTEND); |
| setExclusive(true); |
| setMaximumVelocity(MAX_SCROLL_VELOCITY, MAX_SCROLL_VELOCITY); |
| setRampDownDuration(0); |
| setRampUpDuration(0); |
| } |
| |
| @Override |
| public void scrollTargetBy(int deltaX, int deltaY) { |
| mTarget.scrollBy(deltaX, deltaY); |
| } |
| |
| @Override |
| public boolean canTargetScrollHorizontally(int direction) { |
| // List do not scroll horizontally. |
| return false; |
| } |
| |
| @Override |
| public boolean canTargetScrollVertically(int direction) { |
| return mTarget.canScrollVertically(direction); |
| } |
| } |