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 #ifndef NoEventDispatchAssertion_h 6 #define NoEventDispatchAssertion_h 7 8 #include "wtf/MainThread.h" 9 #include "wtf/TemporaryChange.h" 10 11 namespace WebCore { 12 13 #ifndef NDEBUG 14 15 class NoEventDispatchAssertion { 16 public: 17 NoEventDispatchAssertion() 18 { 19 if (!isMainThread()) 20 return; 21 ++s_count; 22 } 23 24 ~NoEventDispatchAssertion() 25 { 26 if (!isMainThread()) 27 return; 28 ASSERT(s_count); 29 --s_count; 30 } 31 32 static bool isEventDispatchForbidden() 33 { 34 if (!isMainThread()) 35 return false; 36 return s_count; 37 } 38 39 // It's safe to dispatch events in SVGImage since there can't be any script 40 // listeners. 41 class AllowSVGImageEvents { 42 public: 43 AllowSVGImageEvents() 44 : m_change(s_count, 0) 45 { 46 } 47 48 ~AllowSVGImageEvents() 49 { 50 ASSERT(!s_count); 51 } 52 53 TemporaryChange<unsigned> m_change; 54 }; 55 56 private: 57 static unsigned s_count; 58 }; 59 60 #else 61 62 class NoEventDispatchAssertion { 63 public: 64 NoEventDispatchAssertion() { } 65 66 class AllowSVGImageEvents { 67 public: 68 AllowSVGImageEvents() { } 69 }; 70 }; 71 72 #endif // NDEBUG 73 74 } // namespace WebCore 75 76 #endif // NoEventDispatchAssertion_h 77
