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/*
* Copyright (C) 2016 The CyanogenMod 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 org.cyanogenmod.audiofx.preset;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import org.cyanogenmod.audiofx.R;
import org.cyanogenmod.audiofx.activity.EqualizerManager;
import org.cyanogenmod.audiofx.activity.MasterConfigControl;
/**
* A {@link ViewPager} that allows pseudo-infinite paging with a wrap-around effect. Should be used with an {@link
* InfinitePagerAdapter}.
*/
public class InfiniteViewPager extends ViewPager {
private final EqualizerManager mEqManager;
@Override
public boolean hasOverlappingRendering() {
return false;
}
public InfiniteViewPager(Context context) {
super(context);
mEqManager = MasterConfigControl.getInstance(context).getEqualizerManager();
}
public InfiniteViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
mEqManager = MasterConfigControl.getInstance(context).getEqualizerManager();
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (mEqManager.isAnimatingToCustom()) {
return false;
}
return super.onInterceptTouchEvent(ev);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int textSize = getResources().getDimensionPixelSize(R.dimen.preset_text_size)
+ getResources().getDimensionPixelSize(R.dimen.preset_text_padding);
super.onMeasure(widthMeasureSpec,
MeasureSpec.makeMeasureSpec(textSize, MeasureSpec.EXACTLY));
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mEqManager.isAnimatingToCustom()) {
return false;
}
boolean result;
try {
result = super.onTouchEvent(ev);
} catch (IllegalArgumentException e) {
/* There's a bug with the support library where it doesn't check
* the proper pointer index, so when multi touching the container,
* this can sometimes be thrown. Supposedly there are no downsides to just
* catching the exception and moving along, so let's do that....
*/
result = false;
}
return result;
}
@Override
public void setAdapter(PagerAdapter adapter) {
super.setAdapter(adapter);
// offset first element so that we can scroll to the left
setCurrentItem(0);
}
@Override
public void setCurrentItem(int item) {
// offset the current item to ensure there is space to scroll
item = getOffsetAmount() + (item % getAdapter().getCount());
super.setCurrentItem(item);
}
public void setCurrentItemAbsolute(int item) {
super.setCurrentItem(item);
}
private int getOffsetAmount() {
if (getAdapter() instanceof InfinitePagerAdapter) {
InfinitePagerAdapter infAdapter = (InfinitePagerAdapter) getAdapter();
// allow for 100 back cycles from the beginning
// should be enough to create an illusion of infinity
// warning: scrolling to very high values (1,000,000+) results in
// strange drawing behaviour
return infAdapter.getRealCount() * 100;
} else {
return 0;
}
}
public void setCurrentItemAbsolute(int newPage, boolean b) {
super.setCurrentItem(newPage, b);
}
}
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