1/*
2 * Copyright (C) 2013 Google Inc. All Rights Reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY GOOGLE, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 */
26
27#include "config.h"
28#include "platform/OverscrollTheme.h"
29
30namespace blink {
31
32OverscrollTheme::OverscrollTheme()
33{
34#if USE(RUBBER_BANDING)
35    // Load the shadow and pattern for the overhang.
36    m_overhangShadow = Image::loadPlatformResource("overhangShadow");
37    m_overhangPattern = Image::loadPlatformResource("overhangPattern");
38#endif
39}
40
41PassRefPtr<Image> OverscrollTheme::getOverhangImage()
42{
43    return m_overhangPattern;
44}
45
46void OverscrollTheme::setUpOverhangShadowLayer(GraphicsLayer* overhangShadowLayer)
47{
48    // The shadow texture is has a 1-pixel aperture in the center, so the division by
49    // two is doing an intentional round-down.
50    overhangShadowLayer->setContentsToNinePatch(
51        m_overhangShadow.get(),
52        IntRect(m_overhangShadow->width() / 2, m_overhangShadow->height() / 2, 1, 1));
53}
54
55void OverscrollTheme::updateOverhangShadowLayer(GraphicsLayer* shadowLayer, GraphicsLayer* rootContentLayer)
56{
57    // Note that for the position, the division m_overhangShadow->width() / 2 is an intentional
58    // round-down, and that for the width and height, the 1-pixel aperture is being replaced
59    // by the root contents layer, hence subtracting 1 and adding the rootContentsLayer size.
60    IntRect shadowRect(
61        static_cast<int>(rootContentLayer->position().x()) - m_overhangShadow->width() / 2,
62        static_cast<int>(rootContentLayer->position().y()) -  m_overhangShadow->height() / 2,
63        static_cast<int>(rootContentLayer->size().width()) + m_overhangShadow->width() - 1,
64        static_cast<int>(rootContentLayer->size().height()) + m_overhangShadow->height() - 1);
65    shadowLayer->setContentsRect(shadowRect);
66}
67
68OverscrollTheme* OverscrollTheme::theme()
69{
70    DEFINE_STATIC_LOCAL(OverscrollTheme, theme, ());
71    return &theme;
72}
73
74}
75