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      1 /*
      2  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
      3  *
      4  * This library is free software; you can redistribute it and/or
      5  * modify it under the terms of the GNU Library General Public
      6  * License as published by the Free Software Foundation; either
      7  * version 2 of the License, or (at your option) any later version.
      8  *
      9  * This library is distributed in the hope that it will be useful,
     10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  * Library General Public License for more details.
     13  *
     14  * You should have received a copy of the GNU Library General Public License
     15  * along with this library; see the file COPYING.LIB.  If not, write to
     16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  * Boston, MA 02110-1301, USA.
     18  *
     19  */
     20 
     21 #ifndef HTMLFrameOwnerElement_h
     22 #define HTMLFrameOwnerElement_h
     23 
     24 #include "core/html/HTMLElement.h"
     25 #include "wtf/HashCountedSet.h"
     26 
     27 namespace WebCore {
     28 
     29 class DOMWindow;
     30 class ExceptionState;
     31 class Frame;
     32 class RenderPart;
     33 class SVGDocument;
     34 
     35 class HTMLFrameOwnerElement : public HTMLElement {
     36 public:
     37     virtual ~HTMLFrameOwnerElement();
     38 
     39     Frame* contentFrame() const { return m_contentFrame; }
     40     DOMWindow* contentWindow() const;
     41     Document* contentDocument() const;
     42 
     43     void setContentFrame(Frame&);
     44     void clearContentFrame();
     45 
     46     void disconnectContentFrame();
     47 
     48     // Most subclasses use RenderPart (either RenderEmbeddedObject or RenderIFrame)
     49     // except for HTMLObjectElement and HTMLEmbedElement which may return any
     50     // RenderObject when using fallback content.
     51     RenderPart* renderPart() const;
     52 
     53     SVGDocument* getSVGDocument(ExceptionState&) const;
     54 
     55     virtual ScrollbarMode scrollingMode() const { return ScrollbarAuto; }
     56 
     57     SandboxFlags sandboxFlags() const { return m_sandboxFlags; }
     58 
     59     virtual bool loadedNonEmptyDocument() const { return false; }
     60     virtual void didLoadNonEmptyDocument() { }
     61 
     62     virtual void renderFallbackContent() { }
     63 
     64     virtual bool isObjectElement() const { return false; }
     65 
     66 protected:
     67     HTMLFrameOwnerElement(const QualifiedName& tagName, Document&);
     68     void setSandboxFlags(SandboxFlags);
     69 
     70     bool loadOrRedirectSubframe(const KURL&, const AtomicString& frameName, bool lockBackForwardList);
     71 
     72 private:
     73     virtual bool isKeyboardFocusable() const OVERRIDE;
     74     virtual bool isFrameOwnerElement() const OVERRIDE { return true; }
     75 
     76     Frame* m_contentFrame;
     77     SandboxFlags m_sandboxFlags;
     78 };
     79 
     80 DEFINE_NODE_TYPE_CASTS(HTMLFrameOwnerElement, isFrameOwnerElement());
     81 
     82 class SubframeLoadingDisabler {
     83 public:
     84     explicit SubframeLoadingDisabler(Node& root)
     85         : m_root(root)
     86     {
     87         disabledSubtreeRoots().add(&m_root);
     88     }
     89 
     90     ~SubframeLoadingDisabler()
     91     {
     92         disabledSubtreeRoots().remove(&m_root);
     93     }
     94 
     95     static bool canLoadFrame(HTMLFrameOwnerElement& owner)
     96     {
     97         for (Node* node = &owner; node; node = node->parentOrShadowHostNode()) {
     98             if (disabledSubtreeRoots().contains(node))
     99                 return false;
    100         }
    101         return true;
    102     }
    103 
    104 private:
    105     static HashCountedSet<Node*>& disabledSubtreeRoots()
    106     {
    107         DEFINE_STATIC_LOCAL(HashCountedSet<Node*>, nodes, ());
    108         return nodes;
    109     }
    110 
    111     Node& m_root;
    112 };
    113 
    114 } // namespace WebCore
    115 
    116 #endif // HTMLFrameOwnerElement_h
    117