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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this 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 FrameHost_h 32 #define FrameHost_h 33 34 #include "core/frame/PinchViewport.h" 35 #include "platform/heap/Handle.h" 36 #include "wtf/FastAllocBase.h" 37 #include "wtf/Noncopyable.h" 38 #include "wtf/OwnPtr.h" 39 #include "wtf/PassOwnPtr.h" 40 41 namespace blink { 42 43 class Chrome; 44 class EventHandlerRegistry; 45 class Page; 46 class PinchViewport; 47 class Settings; 48 class UseCounter; 49 class Visitor; 50 51 // FrameHost is the set of global data shared between multiple frames 52 // and is provided by the embedder to each frame when created. 53 // FrameHost currently corresponds to the Page object in core/page 54 // however the concept of a Page is moving up out of Blink. 55 // In an out-of-process iframe world, a single Page may have 56 // multiple frames in different process, thus Page becomes a 57 // browser-level concept and Blink core/ only knows about its LocalFrame (and FrameHost). 58 // Separating Page from the rest of core/ through this indirection 59 // allows us to slowly refactor Page without breaking the rest of core. 60 class FrameHost FINAL : public NoBaseWillBeGarbageCollectedFinalized<FrameHost> { 61 WTF_MAKE_NONCOPYABLE(FrameHost); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED; 62 public: 63 static PassOwnPtrWillBeRawPtr<FrameHost> create(Page&); 64 ~FrameHost(); 65 66 // Careful: This function will eventually be removed. 67 Page& page() const { return *m_page; } 68 Settings& settings() const; 69 Chrome& chrome() const; 70 UseCounter& useCounter() const; 71 72 // Corresponds to pixel density of the device where this Page is 73 // being displayed. In multi-monitor setups this can vary between pages. 74 // This value does not account for Page zoom, use LocalFrame::devicePixelRatio instead. 75 float deviceScaleFactor() const; 76 77 PinchViewport& pinchViewport() const; 78 EventHandlerRegistry& eventHandlerRegistry() const; 79 80 void trace(Visitor*); 81 82 private: 83 explicit FrameHost(Page&); 84 85 RawPtrWillBeMember<Page> m_page; 86 const OwnPtr<PinchViewport> m_pinchViewport; 87 const OwnPtrWillBeMember<EventHandlerRegistry> m_eventHandlerRegistry; 88 }; 89 90 } 91 92 #endif // FrameHost_h 93
