Source/core/dom/WheelController.cpp - Issue 206603002: Add EventHandlerRegistry

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Issue 206603002: Add EventHandlerRegistry (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master

Patch Set: More comments. Created 6 years, 8 months ago

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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 * * Redistributions of source code must retain the above copyright

8 * notice, this list of conditions and the following disclaimer.

9 * * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER 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 #include "config.h"

27 #include "core/dom/WheelController.h"

28

29 #include "core/dom/Document.h"

30 #include "core/events/WheelEvent.h"

31 #include "core/frame/LocalFrame.h"

32 #include "core/page/Page.h"

33 #include "core/page/scrolling/ScrollingCoordinator.h"

34

35 namespace WebCore {

36

37 WheelController::WheelController(Document& document)

38 : DOMWindowLifecycleObserver(document.domWindow())

39 , m_wheelEventHandlerCount(0)

40 {

41 }

42

43 WheelController::~WheelController()

44 {

45 }

46

47 const char* WheelController::supplementName()

48 {

49 return "WheelController";

50 }

51

52 WheelController* WheelController::from(Document& document)

53 {

54 WheelController* controller = static_cast<WheelController*>(DocumentSuppleme nt::from(document, supplementName()));

55 if (!controller) {

56 controller = new WheelController(document);

57 DocumentSupplement::provideTo(document, supplementName(), adoptPtr(contr oller));

58 }

59 return controller;

60 }

61

62 static void wheelEventHandlerCountChanged(Document& document)

63 {

64 Page* page = document.page();

65 if (!page)

66 return;

67

68 ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator();

69 if (!scrollingCoordinator)

70 return;

71

72 FrameView* frameView = document.view();

73 if (!frameView)

74 return;

75

76 scrollingCoordinator->frameViewWheelEventHandlerCountChanged(frameView);

77 }

78

79 void WheelController::didAddWheelEventHandler(Document& document)

80 {

81 ++m_wheelEventHandlerCount;

82 Page* page = document.page();

83 LocalFrame* mainFrame = page ? page->mainFrame() : 0;

84 if (mainFrame)

85 mainFrame->notifyChromeClientWheelEventHandlerCountChanged();

86

87 wheelEventHandlerCountChanged(document);

88 }

89

90 void WheelController::didRemoveWheelEventHandler(Document& document)

91 {

92 ASSERT(m_wheelEventHandlerCount > 0);

93 --m_wheelEventHandlerCount;

94 Page* page = document.page();

95 LocalFrame* mainFrame = page ? page->mainFrame() : 0;

96 if (mainFrame)

97 mainFrame->notifyChromeClientWheelEventHandlerCountChanged();

98

99 wheelEventHandlerCountChanged(document);

100 }

101

102 void WheelController::didAddEventListener(DOMWindow* window, const AtomicString& eventType)

103 {

104 if (eventType != EventTypeNames::wheel && eventType != EventTypeNames::mouse wheel)

105 return;

106

107 Document* document = window->document();

108 ASSERT(document);

109 didAddWheelEventHandler(*document);

110 }

111

112 void WheelController::didRemoveEventListener(DOMWindow* window, const AtomicStri ng& eventType)

113 {

114 if (eventType != EventTypeNames::wheel && eventType != EventTypeNames::mouse wheel)

115 return;

116

117 Document* document = window->document();

118 ASSERT(document);

119 didRemoveWheelEventHandler(*document);

120 }

121

122 } // namespace WebCore

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