1d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd/*
2d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Copyright (C) 2015 The Android Open Source Project
3d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd *
4d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Licensed under the Apache License, Version 2.0 (the "License");
5d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * you may not use this file except in compliance with the License.
6d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * You may obtain a copy of the License at
7d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd *
8d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd *      http://www.apache.org/licenses/LICENSE-2.0
9d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd *
10d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * Unless required by applicable law or agreed to in writing, software
11d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * distributed under the License is distributed on an "AS IS" BASIS,
12d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * See the License for the specific language governing permissions and
14d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * limitations under the License.
15d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */
16d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddpackage com.android.messaging.ui;
17d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
18d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddimport android.content.Context;
19d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddimport android.support.v4.view.PagerAdapter;
20d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddimport android.support.v4.view.ViewPager;
21d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddimport android.util.AttributeSet;
22d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddimport android.view.MotionEvent;
23d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
24d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddimport com.android.messaging.util.UiUtils;
25d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
26d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd/**
27d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd * A simple extension on the standard ViewPager which lets you turn paging on/off.
28d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd */
29d3b009ae55651f1e60950342468e3c37fdeb0796Mike Doddpublic class PagingAwareViewPager extends ViewPager {
30d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    private boolean mPagingEnabled = true;
31d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
32d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    public PagingAwareViewPager(Context context, AttributeSet attrs) {
33d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        super(context, attrs);
34d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    }
35d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
36d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    @Override
37d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    public void setCurrentItem(int item, boolean smoothScroll) {
38d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        super.setCurrentItem(getRtlPosition(item), smoothScroll);
39d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    }
40d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
41d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    @Override
42d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    public void setCurrentItem(int item) {
43d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        super.setCurrentItem(getRtlPosition(item));
44d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    }
45d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
46d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    @Override
47d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    public int getCurrentItem() {
48d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        int position = super.getCurrentItem();
49d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        return getRtlPosition(position);
50d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    }
51d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
52d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    /**
53d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd     * Switches position in pager to be adjusted for if we are in RtL mode
54d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd     *
55d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd     * @param position
56d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd     * @return position adjusted if in rtl mode
57d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd     */
58d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    protected int getRtlPosition(final int position) {
59d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        final PagerAdapter adapter = getAdapter();
60d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        if (adapter != null && UiUtils.isRtlMode()) {
61d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd            return adapter.getCount() - 1 - position;
62d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        }
63d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        return position;
64d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    }
65d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
66d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    @Override
67d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    public boolean onTouchEvent(final MotionEvent event) {
68d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        if (!mPagingEnabled) {
69d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd            return false;
70d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        }
71d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        return super.onTouchEvent(event);
72d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    }
73d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
74d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    @Override
75d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    public boolean onInterceptTouchEvent(final MotionEvent event) {
76d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        if (!mPagingEnabled) {
77d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd            return false;
78d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        }
79d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        return super.onInterceptTouchEvent(event);
80d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    }
81d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
82d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    public void setPagingEnabled(final boolean enabled) {
83d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        this.mPagingEnabled = enabled;
84d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    }
85d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd
86d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    /** This prevents touch-less scrolling eg. while doing accessibility navigation. */
87d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    @Override
88d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    public boolean canScrollHorizontally(int direction) {
89d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        if (mPagingEnabled) {
90d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd            return super.canScrollHorizontally(direction);
91d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        } else {
92d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd            return false;
93d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd        }
94d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd    }
95d3b009ae55651f1e60950342468e3c37fdeb0796Mike Dodd}
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