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/*
* 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);
}
}
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