1/*
2 * Copyright (C) 2014 Apple 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 APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "NavigatorGamepad.h"
28
29#if ENABLE(GAMEPAD)
30
31#include "DocumentLoader.h"
32#include "Frame.h"
33#include "Gamepad.h"
34#include "GamepadManager.h"
35#include "GamepadProvider.h"
36#include "Navigator.h"
37#include "PlatformGamepad.h"
38#include <wtf/NeverDestroyed.h>
39#include <wtf/RunLoop.h>
40
41namespace WebCore {
42
43NavigatorGamepad::NavigatorGamepad()
44    : m_navigationStart(std::numeric_limits<double>::infinity())
45{
46    GamepadManager::shared().registerNavigator(this);
47}
48
49NavigatorGamepad::~NavigatorGamepad()
50{
51    GamepadManager::shared().unregisterNavigator(this);
52}
53
54const char* NavigatorGamepad::supplementName()
55{
56    return "NavigatorGamepad";
57}
58
59NavigatorGamepad* NavigatorGamepad::from(Navigator* navigator)
60{
61    NavigatorGamepad* supplement = static_cast<NavigatorGamepad*>(Supplement<Navigator>::from(navigator, supplementName()));
62    if (!supplement) {
63        auto newSupplement = std::make_unique<NavigatorGamepad>();
64        supplement = newSupplement.get();
65        provideTo(navigator, supplementName(), WTF::move(newSupplement));
66
67        if (Frame* frame = navigator->frame()) {
68            if (DocumentLoader* documentLoader = frame->loader().documentLoader())
69                supplement->m_navigationStart = documentLoader->timing()->navigationStart();
70        }
71    }
72    return supplement;
73}
74
75Gamepad* NavigatorGamepad::gamepadAtIndex(unsigned index)
76{
77    if (index >= m_gamepads.size())
78        return nullptr;
79    return m_gamepads[index].get();
80}
81
82const Vector<RefPtr<Gamepad>>& NavigatorGamepad::getGamepads(Navigator* navigator)
83{
84    return NavigatorGamepad::from(navigator)->gamepads();
85}
86
87const Vector<RefPtr<Gamepad>>& NavigatorGamepad::gamepads()
88{
89    if (m_gamepads.isEmpty())
90        return m_gamepads;
91
92    const Vector<PlatformGamepad*>& platformGamepads = GamepadProvider::shared().platformGamepads();
93
94    for (unsigned i = 0; i < platformGamepads.size(); ++i) {
95        if (!platformGamepads[i]) {
96            ASSERT(!m_gamepads[i]);
97            continue;
98        }
99
100        ASSERT(m_gamepads[i]);
101        m_gamepads[i]->updateFromPlatformGamepad(*platformGamepads[i]);
102    }
103
104    return m_gamepads;
105}
106
107void NavigatorGamepad::gamepadsBecameVisible()
108{
109    const Vector<PlatformGamepad*>& platformGamepads = GamepadProvider::shared().platformGamepads();
110    m_gamepads.resize(platformGamepads.size());
111
112    for (unsigned i = 0; i < platformGamepads.size(); ++i) {
113        if (!platformGamepads[i])
114            continue;
115
116        m_gamepads[i] = Gamepad::create(*platformGamepads[i]);
117    }
118}
119
120void NavigatorGamepad::gamepadConnected(PlatformGamepad& platformGamepad)
121{
122    // If this is the first gamepad this Navigator object has seen, then all gamepads just became visible.
123    if (m_gamepads.isEmpty()) {
124        gamepadsBecameVisible();
125        return;
126    }
127
128    unsigned index = platformGamepad.index();
129    ASSERT(GamepadProvider::shared().platformGamepads()[index] == &platformGamepad);
130
131    // The new index should already fit in the existing array, or should be exactly one past-the-end of the existing array.
132    ASSERT(index <= m_gamepads.size());
133
134    if (index < m_gamepads.size())
135        m_gamepads[index] = Gamepad::create(platformGamepad);
136    else if (index == m_gamepads.size())
137        m_gamepads.append(Gamepad::create(platformGamepad));
138}
139
140void NavigatorGamepad::gamepadDisconnected(PlatformGamepad& platformGamepad)
141{
142    // If this Navigator hasn't seen any gamepads yet its Vector will still be empty.
143    if (!m_gamepads.size())
144        return;
145
146    ASSERT(platformGamepad.index() < m_gamepads.size());
147    ASSERT(m_gamepads[platformGamepad.index()]);
148
149    m_gamepads[platformGamepad.index()] = nullptr;
150}
151
152} // namespace WebCore
153
154#endif // ENABLE(GAMEPAD)
155