OLD | NEW |
1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef WebFrameImplBase_h | 5 #ifndef WebFrameImplBase_h |
6 #define WebFrameImplBase_h | 6 #define WebFrameImplBase_h |
7 | 7 |
8 #include "platform/heap/Handle.h" | 8 #include "platform/heap/Handle.h" |
9 #include "web/WebExport.h" | 9 #include "web/WebExport.h" |
10 #include "wtf/text/AtomicString.h" | 10 #include "wtf/text/AtomicString.h" |
11 | 11 |
12 namespace blink { | 12 namespace blink { |
13 | 13 |
14 class Frame; | 14 class Frame; |
15 class FrameHost; | |
16 class FrameOwner; | 15 class FrameOwner; |
| 16 class Page; |
17 | 17 |
18 // WebFrameImplBase exists to avoid the diamond inheritance problem: | 18 // WebFrameImplBase exists to avoid the diamond inheritance problem: |
19 // - The public interfaces WebLocalFrame/WebRemoteFrame extend WebFrame. | 19 // - The public interfaces WebLocalFrame/WebRemoteFrame extend WebFrame. |
20 // - WebLocalFrameImpl implements WebLocalFrame and WebRemoteFrameImpl | 20 // - WebLocalFrameImpl implements WebLocalFrame and WebRemoteFrameImpl |
21 // implements WebRemoteFrame. | 21 // implements WebRemoteFrame. |
22 // - The private implementations should share some functionality, but cannot | 22 // - The private implementations should share some functionality, but cannot |
23 // inherit from a common base class inheriting WebFrame. This would result in | 23 // inherit from a common base class inheriting WebFrame. This would result in |
24 // WebFrame beind inherited from two different base classes. | 24 // WebFrame beind inherited from two different base classes. |
25 // | 25 // |
26 // To get around this, only the private implementations have WebFrameImplBase as | 26 // To get around this, only the private implementations have WebFrameImplBase as |
27 // a base class. WebFrame exposes a virtual accessor to retrieve the underlying | 27 // a base class. WebFrame exposes a virtual accessor to retrieve the underlying |
28 // implementation as an instance of the base class, but has no inheritance | 28 // implementation as an instance of the base class, but has no inheritance |
29 // relationship with it. The cost is a virtual indirection, but this is nicer | 29 // relationship with it. The cost is a virtual indirection, but this is nicer |
30 // than the previous manual dispatch emulating real virtual dispatch. | 30 // than the previous manual dispatch emulating real virtual dispatch. |
31 class WEB_EXPORT WebFrameImplBase | 31 class WEB_EXPORT WebFrameImplBase |
32 : public GarbageCollectedFinalized<WebFrameImplBase> { | 32 : public GarbageCollectedFinalized<WebFrameImplBase> { |
33 public: | 33 public: |
34 virtual ~WebFrameImplBase(); | 34 virtual ~WebFrameImplBase(); |
35 | 35 |
36 virtual void initializeCoreFrame(FrameHost*, | 36 virtual void initializeCoreFrame(Page&, |
37 FrameOwner*, | 37 FrameOwner*, |
38 const AtomicString& name) = 0; | 38 const AtomicString& name) = 0; |
39 // TODO(dcheng): Rename this to coreFrame()? This probably also shouldn't be | 39 // TODO(dcheng): Rename this to coreFrame()? This probably also shouldn't be |
40 // const... | 40 // const... |
41 virtual Frame* frame() const = 0; | 41 virtual Frame* frame() const = 0; |
42 | 42 |
43 DECLARE_VIRTUAL_TRACE(); | 43 DECLARE_VIRTUAL_TRACE(); |
44 }; | 44 }; |
45 | 45 |
46 } // namespace blink | 46 } // namespace blink |
47 | 47 |
48 #endif // WebFrameImplBase_h | 48 #endif // WebFrameImplBase_h |
OLD | NEW |