1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.tv.guide;
18
19import android.content.Context;
20import android.util.AttributeSet;
21
22public class TimelineRow extends TimelineGridView {
23    private static final float FADING_EDGE_STRENGTH_START = 1.0f;
24
25    private int mScrollPosition;
26
27    public TimelineRow(Context context) {
28        this(context, null);
29    }
30
31    public TimelineRow(Context context, AttributeSet attrs) {
32        this(context, attrs, 0);
33    }
34
35    public TimelineRow(Context context, AttributeSet attrs, int defStyle) {
36        super(context, attrs, defStyle);
37    }
38
39    public void resetScroll() {
40        getLayoutManager().scrollToPosition(0);
41    }
42
43    /**
44     * Returns the current scroll position
45     */
46    public int getScrollOffset() {
47        return Math.abs(mScrollPosition);
48    }
49
50    /**
51     * Scrolls horizontally to the given position.
52     */
53    public void scrollTo(int scrollOffset, boolean smoothScroll) {
54        int dx = (scrollOffset - getScrollOffset())
55                * (getLayoutDirection() == LAYOUT_DIRECTION_LTR ? 1 : -1);
56        if (smoothScroll) {
57            smoothScrollBy(dx, 0);
58        } else {
59            scrollBy(dx, 0);
60        }
61    }
62
63    @Override
64    public void onRtlPropertiesChanged(int layoutDirection) {
65        super.onRtlPropertiesChanged(layoutDirection);
66        // Reset scroll
67        if (isAttachedToWindow()) {
68            scrollTo(getScrollOffset(), false);
69        }
70    }
71
72    @Override
73    public void onScrolled(int dx, int dy) {
74        if (dx == 0 && dy == 0) {
75            mScrollPosition = 0;
76        } else {
77            mScrollPosition += dx;
78        }
79    }
80
81    @Override
82    protected float getLeftFadingEdgeStrength() {
83        return (getLayoutDirection() == LAYOUT_DIRECTION_LTR) ? FADING_EDGE_STRENGTH_START : 0;
84    }
85
86    @Override
87    protected float getRightFadingEdgeStrength() {
88        return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? FADING_EDGE_STRENGTH_START : 0;
89    }
90}
91