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/*
* Copyright (C) 2015 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.messaging.ui;
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 com.android.messaging.util.UiUtils;
/**
* A simple extension on the standard ViewPager which lets you turn paging on/off.
*/
public class PagingAwareViewPager extends ViewPager {
private boolean mPagingEnabled = true;
public PagingAwareViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void setCurrentItem(int item, boolean smoothScroll) {
super.setCurrentItem(getRtlPosition(item), smoothScroll);
}
@Override
public void setCurrentItem(int item) {
super.setCurrentItem(getRtlPosition(item));
}
@Override
public int getCurrentItem() {
int position = super.getCurrentItem();
return getRtlPosition(position);
}
/**
* Switches position in pager to be adjusted for if we are in RtL mode
*
* @param position
* @return position adjusted if in rtl mode
*/
protected int getRtlPosition(final int position) {
final PagerAdapter adapter = getAdapter();
if (adapter != null && UiUtils.isRtlMode()) {
return adapter.getCount() - 1 - position;
}
return position;
}
@Override
public boolean onTouchEvent(final MotionEvent event) {
if (!mPagingEnabled) {
return false;
}
return super.onTouchEvent(event);
}
@Override
public boolean onInterceptTouchEvent(final MotionEvent event) {
if (!mPagingEnabled) {
return false;
}
return super.onInterceptTouchEvent(event);
}
public void setPagingEnabled(final boolean enabled) {
this.mPagingEnabled = enabled;
}
/** This prevents touch-less scrolling eg. while doing accessibility navigation. */
@Override
public boolean canScrollHorizontally(int direction) {
if (mPagingEnabled) {
return super.canScrollHorizontally(direction);
} else {
return false;
}
}
}
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