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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsDOMCaretPosition_h
#define nsDOMCaretPosition_h
#include "nsCycleCollectionParticipant.h"
#include "nsCOMPtr.h"
#include "nsINode.h"
#include "nsWrapperCache.h"
namespace mozilla {
namespace dom {
class DOMRect;
} // namespace dom
} // namespace mozilla
/**
* Implementation of a DOM Caret Position, which is a node and offset within
* that node, in the DOM tree.
*
* http://www.w3.org/TR/cssom-view/#dom-documentview-caretrangefrompoint
*
* @see Document::caretPositionFromPoint(float x, float y)
*/
class nsDOMCaretPosition : public nsISupports, public nsWrapperCache {
typedef mozilla::dom::DOMRect DOMRect;
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsDOMCaretPosition)
nsDOMCaretPosition(nsINode* aNode, uint32_t aOffset);
/**
* Retrieve the offset (character position within the DOM node) of the
* CaretPosition.
*
* @returns The offset within the DOM node.
*/
uint32_t Offset() const { return mOffset; }
/**
* Retrieve the DOM node with which this CaretPosition was established.
* Normally, this will be created from a point, so it will be the DOM
* node that lies at the point specified.
*
* @returns The DOM node of the CaretPosition.
*
* @see Document::caretPositionFromPoint(float x, float y)
*/
nsINode* GetOffsetNode() const;
/**
* Retrieve the bounding rectangle of this CaretPosition object.
*
* @returns An nsClientRect representing the bounding rectangle of this
* CaretPosition, if one can be successfully determined, otherwise
* nullptr.
*/
already_AddRefed<DOMRect> GetClientRect() const;
/**
* Set the anonymous content node that is the actual parent of this
* CaretPosition object. In situations where the DOM node for a CaretPosition
* actually lies within an anonymous content node (e.g. a textarea), the
* actual parent is not set as the offset node. This is used to get the
* correct bounding box of a CaretPosition object that lies within a textarea
* or input element.
*
* @param aNode A pointer to an nsINode object that is the actual element
* within which this CaretPosition lies, but is an anonymous content
* node.
*/
void SetAnonymousContentNode(nsINode* aNode) {
mAnonymousContentNode = aNode;
}
nsISupports* GetParentObject() const { return GetOffsetNode(); }
JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
protected:
virtual ~nsDOMCaretPosition();
uint32_t mOffset;
nsCOMPtr<nsINode> mOffsetNode;
nsCOMPtr<nsINode> mAnonymousContentNode;
};
#endif
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