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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "config.h" | |
| 6 #include "modules/screen_orientation/ScreenOrientationDispatcher.h" | |
| 7 | |
| 8 #include "modules/screen_orientation/ScreenOrientationController.h" | |
| 9 #include "public/platform/Platform.h" | |
| 10 #include "wtf/TemporaryChange.h" | |
| 11 | |
| 12 namespace WebCore { | |
| 13 | |
| 14 ScreenOrientationDispatcher& ScreenOrientationDispatcher::instance() | |
| 15 { | |
| 16 #if ENABLE(OILPAN) | |
| 17 DEFINE_STATIC_LOCAL(Persistent<ScreenOrientationDispatcher>, screenOrientati
onDispatcher, (new ScreenOrientationDispatcher())); | |
| 18 return *screenOrientationDispatcher; | |
| 19 #else | |
| 20 DEFINE_STATIC_LOCAL(ScreenOrientationDispatcher, screenOrientationDispatcher
, ()); | |
| 21 return screenOrientationDispatcher; | |
| 22 #endif | |
| 23 } | |
| 24 | |
| 25 ScreenOrientationDispatcher::ScreenOrientationDispatcher() | |
| 26 #if !ENABLE(OILPAN) | |
| 27 : m_needsPurge(false) | |
| 28 , m_isDispatching(false) | |
| 29 #endif | |
| 30 { | |
| 31 } | |
| 32 | |
| 33 void ScreenOrientationDispatcher::addController(ScreenOrientationController* con
troller) | |
| 34 { | |
| 35 bool wasEmpty = m_controllers.isEmpty(); | |
| 36 #if ENABLE(OILPAN) | |
| 37 m_controllers.add(controller); | |
| 38 #else | |
| 39 if (!m_controllers.contains(controller)) | |
| 40 m_controllers.append(controller); | |
| 41 #endif | |
| 42 if (wasEmpty) | |
| 43 startListening(); | |
| 44 } | |
| 45 | |
| 46 #if !ENABLE(OILPAN) | |
| 47 void ScreenOrientationDispatcher::removeController(ScreenOrientationController*
controller) | |
| 48 { | |
| 49 // Do not actually remove the controllers from the vector, instead zero them
out. | |
| 50 // The zeros are removed in these two cases: | |
| 51 // 1. either immediately if we are not dispatching any events, | |
| 52 // 2. or after didChangeScreenOrientation has dispatched all events. | |
| 53 // This is to correctly handle the re-entrancy case when a controller is des
troyed | |
| 54 // while in the didChangeScreenOrientation() method. | |
| 55 size_t index = m_controllers.find(controller); | |
| 56 if (index == kNotFound) | |
| 57 return; | |
| 58 | |
| 59 m_controllers[index] = 0; | |
| 60 m_needsPurge = true; | |
| 61 | |
| 62 if (!m_isDispatching) | |
| 63 purgeControllers(); | |
| 64 } | |
| 65 | |
| 66 void ScreenOrientationDispatcher::purgeControllers() | |
| 67 { | |
| 68 ASSERT(m_needsPurge); | |
| 69 | |
| 70 size_t i = 0; | |
| 71 while (i < m_controllers.size()) { | |
| 72 if (!m_controllers[i]) { | |
| 73 m_controllers[i] = m_controllers.last(); | |
| 74 m_controllers.removeLast(); | |
| 75 } else { | |
| 76 ++i; | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 m_needsPurge = false; | |
| 81 | |
| 82 if (m_controllers.isEmpty()) | |
| 83 stopListening(); | |
| 84 } | |
| 85 #endif | |
| 86 | |
| 87 void ScreenOrientationDispatcher::didChangeScreenOrientation(blink::WebScreenOri
entationType orientation) | |
| 88 { | |
| 89 #if ENABLE(OILPAN) | |
| 90 if (m_controllers.isEmpty()) { | |
| 91 stopListening(); | |
| 92 return; | |
| 93 } | |
| 94 // The on-stack iterator will make m_controllers strong while iterating, | |
| 95 // therefore no controllers can be removed during iteration. | |
| 96 for (HeapHashSet<WeakMember<ScreenOrientationController> >::iterator it = m_
controllers.begin(); it != m_controllers.end(); ++it) { | |
| 97 (*it)->didChangeScreenOrientation(orientation); | |
| 98 } | |
| 99 #else | |
| 100 { | |
| 101 TemporaryChange<bool> changeIsDispatching(m_isDispatching, true); | |
| 102 // Don't fire controllers removed or added during event dispatch. | |
| 103 size_t size = m_controllers.size(); | |
| 104 for (size_t i = 0; i < size; ++i) { | |
| 105 if (m_controllers[i]) | |
| 106 static_cast<ScreenOrientationController*>(m_controllers[i])->did
ChangeScreenOrientation(orientation); | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 if (m_needsPurge) | |
| 111 purgeControllers(); | |
| 112 #endif | |
| 113 } | |
| 114 | |
| 115 void ScreenOrientationDispatcher::startListening() | |
| 116 { | |
| 117 blink::Platform::current()->setScreenOrientationListener(this); | |
| 118 } | |
| 119 | |
| 120 void ScreenOrientationDispatcher::stopListening() | |
| 121 { | |
| 122 blink::Platform::current()->setScreenOrientationListener(0); | |
| 123 } | |
| 124 | |
| 125 #if ENABLE(OILPAN) | |
| 126 void ScreenOrientationDispatcher::trace(Visitor* visitor) | |
| 127 { | |
| 128 // Weak processing will remove controllers once they are dead. | |
| 129 visitor->trace(m_controllers); | |
| 130 } | |
| 131 #endif | |
| 132 | |
| 133 } // namespace WebCore | |
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Chromium Code Reviews
Issue 277413002:
Make screen.orientation implementation use WebScreenInfo::orientationType (Closed)
Base URL: svn://svn.chromium.org/blink/trunk