1/*
2 * Copyright (C) 2011 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 are
6 * met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. AND ITS CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC.
20 * OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "config.h"
30#include "web/PageOverlayList.h"
31
32#include "public/web/WebPageOverlay.h"
33#include "web/PageOverlay.h"
34#include "web/WebViewImpl.h"
35
36namespace blink {
37
38PassOwnPtr<PageOverlayList> PageOverlayList::create(WebViewImpl* viewImpl)
39{
40    return adoptPtr(new PageOverlayList(viewImpl));
41}
42
43PageOverlayList::PageOverlayList(WebViewImpl* viewImpl)
44    : m_viewImpl(viewImpl)
45{
46}
47
48PageOverlayList::~PageOverlayList()
49{
50}
51
52bool PageOverlayList::add(WebPageOverlay* overlay, int zOrder)
53{
54    bool added = false;
55    size_t index = find(overlay);
56    if (index == WTF::kNotFound) {
57        OwnPtr<PageOverlay> pageOverlay = PageOverlay::create(m_viewImpl, overlay);
58        m_pageOverlays.append(pageOverlay.release());
59        index = m_pageOverlays.size() - 1;
60        added = true;
61    }
62
63    PageOverlay* pageOverlay = m_pageOverlays[index].get();
64    pageOverlay->setZOrder(zOrder);
65
66    // Adjust page overlay list order based on their z-order numbers. We first
67    // check if we need to move the overlay up and do so if needed. Otherwise,
68    // check if we need to move it down.
69    bool zOrderChanged = false;
70    for (size_t i = index; i + 1 < m_pageOverlays.size(); ++i) {
71        if (m_pageOverlays[i]->zOrder() >= m_pageOverlays[i + 1]->zOrder()) {
72            m_pageOverlays[i].swap(m_pageOverlays[i + 1]);
73            zOrderChanged = true;
74        }
75    }
76
77    if (!zOrderChanged) {
78        for (size_t i = index; i >= 1; --i) {
79            if (m_pageOverlays[i]->zOrder() < m_pageOverlays[i - 1]->zOrder()) {
80                m_pageOverlays[i].swap(m_pageOverlays[i - 1]);
81                zOrderChanged = true;
82            }
83        }
84    }
85
86    // If we did move the overlay, that means z-order is changed and we need to
87    // update overlay layers' z-order. Otherwise, just update current overlay.
88    if (zOrderChanged) {
89        for (size_t i = 0; i < m_pageOverlays.size(); ++i)
90            m_pageOverlays[i]->clear();
91        update();
92    } else
93        pageOverlay->update();
94
95    return added;
96}
97
98bool PageOverlayList::remove(WebPageOverlay* overlay)
99{
100    size_t index = find(overlay);
101    if (index == WTF::kNotFound)
102        return false;
103
104    m_pageOverlays[index]->clear();
105    m_pageOverlays.remove(index);
106    return true;
107}
108
109void PageOverlayList::update()
110{
111    for (size_t i = 0; i < m_pageOverlays.size(); ++i)
112        m_pageOverlays[i]->update();
113}
114
115void PageOverlayList::paintWebFrame(GraphicsContext& gc)
116{
117    for (size_t i = 0; i < m_pageOverlays.size(); ++i)
118        m_pageOverlays[i]->paintWebFrame(gc);
119}
120
121size_t PageOverlayList::find(WebPageOverlay* overlay)
122{
123    for (size_t i = 0; i < m_pageOverlays.size(); ++i) {
124        if (m_pageOverlays[i]->overlay() == overlay)
125            return i;
126    }
127    return WTF::kNotFound;
128}
129
130size_t PageOverlayList::findGraphicsLayer(GraphicsLayer* layer)
131{
132    for (size_t i = 0; i < m_pageOverlays.size(); ++i) {
133        if (m_pageOverlays[i]->graphicsLayer() == layer)
134            return i;
135    }
136    return WTF::kNotFound;
137}
138
139} // namespace blink
140