third_party/WebKit/public/web/WebNode.h

   1 /*
   2  * Copyright (C) 2009 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 WebNode_h
  32 #define WebNode_h
  33
  34 #include "../platform/WebCommon.h"
  35 #include "../platform/WebPrivatePtr.h"
  36 #include "../platform/WebString.h"
  37 #include "../platform/WebVector.h"
  38 #include "WebExceptionCode.h"
  39
  40 namespace blink {
  41
  42 class Node;
  43 class WebAXObject;
  44 class WebDOMEvent;
  45 class WebDocument;
  46 class WebElement;
  47 class WebElementCollection;
  48 class WebNodeList;
  49 class WebPluginContainer;
  50
  51 // Provides access to some properties of a DOM node.
  52 // Note that the class design requires that neither this class nor any of its subclasses have any virtual
  53 // methods (other than the destructor), so that it is possible to safely static_cast an instance of one
  54 // class to the appropriate subclass based on the actual type of the wrapped blink::Node. For the same
  55 // reason, subclasses must not add any additional data members.
  56 class WebNode {
  57 public:
  58     virtual ~WebNode() { reset(); }
  59
  60     WebNode() { }
  61     WebNode(const WebNode& n) { assign(n); }
  62     WebNode& operator=(const WebNode& n)
  63     {
  64         assign(n);
  65         return *this;
  66     }
  67
  68     BLINK_EXPORT void reset();
  69     BLINK_EXPORT void assign(const WebNode&);
  70
  71     BLINK_EXPORT bool equals(const WebNode&) const;
  72     // Required for using WebNodes in std maps.  Note the order used is
  73     // arbitrary and should not be expected to have any specific meaning.
  74     BLINK_EXPORT bool lessThan(const WebNode&) const;
  75
  76     bool isNull() const { return m_private.isNull(); }
  77
  78     enum NodeType {
  79         ElementNode = 1,
  80         AttributeNode = 2,
  81         TextNode = 3,
  82         CDataSectionNode = 4,
  83         // EntityReferenceNodes are impossible to create in Blink.
  84         // EntityNodes are impossible to create in Blink.
  85         ProcessingInstructionsNode = 7,
  86         CommentNode = 8,
  87         DocumentNode = 9,
  88         DocumentTypeNode = 10,
  89         DocumentFragmentNode = 11,
  90         // NotationNodes are impossible to create in Blink.
  91         // XPathNamespaceNodes are impossible to create in Blink.
  92         ShadowRootNode = 14
  93     };
  94
  95     BLINK_EXPORT NodeType nodeType() const;
  96     BLINK_EXPORT WebNode parentNode() const;
  97     BLINK_EXPORT WebString nodeValue() const;
  98     BLINK_EXPORT WebDocument document() const;
  99     BLINK_EXPORT WebNode firstChild() const;
 100     BLINK_EXPORT WebNode lastChild() const;
 101     BLINK_EXPORT WebNode previousSibling() const;
 102     BLINK_EXPORT WebNode nextSibling() const;
 103     BLINK_EXPORT bool hasChildNodes() const;
 104     BLINK_EXPORT WebNodeList childNodes();
 105     BLINK_EXPORT bool isLink() const;
 106     BLINK_EXPORT bool isCommentNode() const;
 107     BLINK_EXPORT bool isTextNode() const;
 108     BLINK_EXPORT bool isFocusable() const;
 109     BLINK_EXPORT bool isContentEditable() const;
 110     BLINK_EXPORT bool isElementNode() const;
 111     BLINK_EXPORT void dispatchEvent(const WebDOMEvent&);
 112     BLINK_EXPORT void simulateClick();
 113     // The argument should be lower-cased.
 114     BLINK_EXPORT WebElementCollection getElementsByHTMLTagName(const WebString&) const;
 115
 116
 117     BLINK_EXPORT WebElement querySelector(const WebString& selector, WebExceptionCode&) const;
 118     BLINK_EXPORT void querySelectorAll(const WebString& selector, WebVector<WebElement>& results, WebExceptionCode&) const;
 119
 120     // Same as querySelector and querySelectorAll, but ASSERT if an exception
 121     // code would be generated.
 122     BLINK_EXPORT WebElement querySelector(const WebString& selector) const;
 123     BLINK_EXPORT void querySelectorAll(const WebString& selector, WebVector<WebElement>& results) const;
 124
 125     BLINK_EXPORT bool focused() const;
 126
 127     BLINK_EXPORT WebPluginContainer* pluginContainer() const;
 128
 129     BLINK_EXPORT bool isInsideFocusableElementOrARIAWidget() const;
 130     BLINK_EXPORT WebAXObject accessibilityObject();
 131
 132     template<typename T> T to()
 133     {
 134         T res;
 135         res.WebNode::assign(*this);
 136         return res;
 137     }
 138
 139     template<typename T> const T toConst() const
 140     {
 141         T res;
 142         res.WebNode::assign(*this);
 143         return res;
 144     }
 145
 146 #if BLINK_IMPLEMENTATION
 147     WebNode(const PassRefPtrWillBeRawPtr<Node>&);
 148     WebNode& operator=(const PassRefPtrWillBeRawPtr<Node>&);
 149     operator PassRefPtrWillBeRawPtr<Node>() const;
 150 #endif
 151
 152 #if BLINK_IMPLEMENTATION
 153     template<typename T> T* unwrap()
 154     {
 155         return static_cast<T*>(m_private.get());
 156     }
 157
 158     template<typename T> const T* constUnwrap() const
 159     {
 160         return static_cast<const T*>(m_private.get());
 161     }
 162 #endif
 163
 164 protected:
 165     WebPrivatePtr<Node> m_private;
 166 };
 167
 168 inline bool operator==(const WebNode& a, const WebNode& b)
 169 {
 170     return a.equals(b);
 171 }
 172
 173 inline bool operator!=(const WebNode& a, const WebNode& b)
 174 {
 175     return !(a == b);
 176 }
 177
 178 inline bool operator<(const WebNode& a, const WebNode& b)
 179 {
 180     return a.lessThan(b);
 181 }
 182
 183 } // namespace blink
 184
 185 #endif