sky/engine/core/dom/custom/CustomElementProcessingStack.h - Issue 950523002: Delete sky/engine/core/dom/custom

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Issue 950523002: Delete sky/engine/core/dom/custom (Closed) Base URL: git@github.com:domokit/mojo.git@master

Patch Set: Created 5 years, 10 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 *

8 * 1. Redistributions of source code must retain the above copyright

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

10 * 2. Redistributions in binary form must reproduce the above copyright

11 * notice, this list of conditions and the following disclaimer

12 * in the documentation and/or other materials provided with the

13 * distribution.

14 * 3. Neither the name of Google Inc. nor the names of its contributors

15 * may be used to endorse or promote products derived from this

16 * software without specific prior written permission.

17 *

18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

29 */

30

31 #ifndef SKY_ENGINE_CORE_DOM_CUSTOM_CUSTOMELEMENTPROCESSINGSTACK_H_

32 #define SKY_ENGINE_CORE_DOM_CUSTOM_CUSTOMELEMENTPROCESSINGSTACK_H_

33

34 #include "sky/engine/core/dom/custom/CustomElementCallbackQueue.h"

35 #include "sky/engine/wtf/Vector.h"

36

37 namespace blink {

38

39 class CustomElementScheduler;

40

41 class CustomElementProcessingStack {

42 WTF_MAKE_NONCOPYABLE(CustomElementProcessingStack);

43 public:

44 // This is stack allocated in many DOM callbacks. Make it cheap.

45 class CallbackDeliveryScope {

46 public:

47 CallbackDeliveryScope()

48 : m_savedElementQueueStart(s_elementQueueStart)

49 {

50 s_elementQueueStart = s_elementQueueEnd;

51 }

52

53 ~CallbackDeliveryScope()

54 {

55 if (s_elementQueueStart != s_elementQueueEnd)

56 processElementQueueAndPop();

57 s_elementQueueStart = m_savedElementQueueStart;

58 }

59

60 private:

61 size_t m_savedElementQueueStart;

62 };

63

64 static bool inCallbackDeliveryScope() { return s_elementQueueStart; }

65

66 protected:

67 friend class CustomElementScheduler;

68 static CustomElementProcessingStack& instance();

69 void enqueue(CustomElementCallbackQueue*);

70

71 private:

72 CustomElementProcessingStack()

73 {

74 // Add a null element as a sentinel. This makes it possible to

75 // identify elements queued when there is no

76 // CallbackDeliveryScope active. Also, if the processing stack

77 // is popped when empty, this sentinel will cause a null deref

78 // crash.

79 CustomElementCallbackQueue* sentinel = 0;

80 for (size_t i = 0; i < kNumSentinels; i++)

81 m_flattenedProcessingStack.append(sentinel);

82 ASSERT(s_elementQueueEnd == m_flattenedProcessingStack.size());

83 }

84

85 // The start of the element queue on the top of the processing

86 // stack. An offset into instance().m_flattenedProcessingStack.

87 static size_t s_elementQueueStart;

88

89 // The end of the element queue on the top of the processing

90 // stack. A cache of instance().m_flattenedProcessingStack.size().

91 static size_t s_elementQueueEnd;

92

93 static CustomElementCallbackQueue::ElementQueueId currentElementQueue() { re turn CustomElementCallbackQueue::ElementQueueId(s_elementQueueStart); }

94

95 static void processElementQueueAndPop();

96 void processElementQueueAndPop(size_t start, size_t end);

97

98 // The processing stack, flattened. Element queues lower in the

99 // stack appear toward the head of the vector. The first element

100 // is a null sentinel value.

101 static const size_t kNumSentinels = 1;

102 Vector<CustomElementCallbackQueue*> m_flattenedProcessingStack;

103 };

104

105 }

106

107 #endif // SKY_ENGINE_CORE_DOM_CUSTOM_CUSTOMELEMENTPROCESSINGSTACK_H_

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