The Tor Browser / file comparison
comparison: layout/generic/nsQueryFrame.h
layout/generic/nsQueryFrame.h
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:6e6246fad0f2 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #ifndef nsQueryFrame_h | |
| 6 #define nsQueryFrame_h | |
| 7 | |
| 8 #include "nscore.h" | |
| 9 #include "mozilla/Assertions.h" | |
| 10 #include "mozilla/TypeTraits.h" | |
| 11 | |
| 12 // NOTE: the long lines in this file are intentional to make compiler error | |
| 13 // messages more readable. | |
| 14 | |
| 15 #define NS_DECL_QUERYFRAME_TARGET(classname) \ | |
| 16 static const nsQueryFrame::FrameIID kFrameIID = nsQueryFrame::classname##_id; \ | |
| 17 typedef classname Has_NS_DECL_QUERYFRAME_TARGET; | |
| 18 | |
| 19 #define NS_DECL_QUERYFRAME \ | |
| 20 virtual void* QueryFrame(FrameIID id); | |
| 21 | |
| 22 #define NS_QUERYFRAME_HEAD(class) \ | |
| 23 void* class::QueryFrame(FrameIID id) { switch (id) { | |
| 24 | |
| 25 #define NS_QUERYFRAME_ENTRY(class) \ | |
| 26 case class::kFrameIID: { \ | |
| 27 static_assert(mozilla::IsSame<class, class::Has_NS_DECL_QUERYFRAME_TARGET>::value, \ | |
| 28 #class " must declare itself as a queryframe target"); \ | |
| 29 return static_cast<class*>(this); \ | |
| 30 } | |
| 31 | |
| 32 #define NS_QUERYFRAME_ENTRY_CONDITIONAL(class, condition) \ | |
| 33 case class::kFrameIID: \ | |
| 34 if (condition) { \ | |
| 35 static_assert(mozilla::IsSame<class, class::Has_NS_DECL_QUERYFRAME_TARGET>::value, \ | |
| 36 #class " must declare itself as a queryframe target"); \ | |
| 37 return static_cast<class*>(this); \ | |
| 38 } \ | |
| 39 break; | |
| 40 | |
| 41 #define NS_QUERYFRAME_TAIL_INHERITING(class) \ | |
| 42 default: break; \ | |
| 43 } \ | |
| 44 return class::QueryFrame(id); \ | |
| 45 } | |
| 46 | |
| 47 #define NS_QUERYFRAME_TAIL_INHERITANCE_ROOT \ | |
| 48 default: break; \ | |
| 49 } \ | |
| 50 MOZ_ASSERT(id != GetFrameId(), \ | |
| 51 "A frame failed to QueryFrame to its *own type*. " \ | |
| 52 "It may be missing NS_DECL_QUERYFRAME, or a " \ | |
| 53 "NS_QUERYFRAME_ENTRY() line with its own type name"); \ | |
| 54 return nullptr; \ | |
| 55 } | |
| 56 | |
| 57 class nsQueryFrame | |
| 58 { | |
| 59 public: | |
| 60 enum FrameIID { | |
| 61 #define FRAME_ID(classname) classname##_id, | |
| 62 #include "nsFrameIdList.h" | |
| 63 #undef FRAME_ID | |
| 64 | |
| 65 // The PresArena implementation uses this bit to distinguish objects | |
| 66 // allocated by size from objects allocated by type ID (that is, frames | |
| 67 // using AllocateByFrameID, and other objects using AllocateByObjectID). | |
| 68 // It should not collide with any frame ID (above) or Object ID (in | |
| 69 // nsPresArena.h). It is not 0x80000000 to avoid the question of | |
| 70 // whether enumeration constants are signed. | |
| 71 NON_FRAME_MARKER = 0x20000000 | |
| 72 }; | |
| 73 | |
| 74 virtual void* QueryFrame(FrameIID id) = 0; | |
| 75 }; | |
| 76 | |
| 77 class do_QueryFrame | |
| 78 { | |
| 79 public: | |
| 80 do_QueryFrame(nsQueryFrame *s) : mRawPtr(s) { } | |
| 81 | |
| 82 template<class Dest> | |
| 83 operator Dest*() { | |
| 84 static_assert(mozilla::IsSame<Dest, typename Dest::Has_NS_DECL_QUERYFRAME_TARGET>::value, | |
| 85 "Dest must declare itself as a queryframe target"); | |
| 86 if (!mRawPtr) | |
| 87 return nullptr; | |
| 88 | |
| 89 return reinterpret_cast<Dest*>(mRawPtr->QueryFrame(Dest::kFrameIID)); | |
| 90 } | |
| 91 | |
| 92 private: | |
| 93 nsQueryFrame *mRawPtr; | |
| 94 }; | |
| 95 | |
| 96 #endif // nsQueryFrame_h |
