gecko-dev/dom/svg/SVGFragmentIdentifier.h

61 строка
2.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 MOZILLA_SVGFRAGMENTIDENTIFIER_H__
#define MOZILLA_SVGFRAGMENTIDENTIFIER_H__
#include "nsString.h"
class nsIDocument;
class nsSVGViewElement;
namespace mozilla {
namespace dom {
class SVGSVGElement;
}
/**
* Implements support for parsing SVG fragment identifiers
* http://www.w3.org/TR/SVG/linking.html#SVGFragmentIdentifiers
*/
class SVGFragmentIdentifier
{
// To prevent the class being instantiated
SVGFragmentIdentifier() = delete;
public:
/**
* Process the SVG fragment identifier, if there is one.
* @return true if we found a valid svgView()-style fragment identifier,
* in which case further processing by the caller can stop. Otherwise return
* false as we may have an ordinary anchor which needs to be :target matched.
*/
static bool ProcessFragmentIdentifier(nsIDocument *aDocument,
const nsAString &aAnchorName);
private:
/**
* Parse an SVG ViewSpec and set applicable attributes on the root element.
* @return true if there is a valid ViewSpec
*/
static bool ProcessSVGViewSpec(const nsAString &aViewSpec, dom::SVGSVGElement *root);
// Save and restore things we override in case we want to go back e.g. the
// user presses the back button
static void SaveOldPreserveAspectRatio(dom::SVGSVGElement *root);
static void RestoreOldPreserveAspectRatio(dom::SVGSVGElement *root);
static void SaveOldViewBox(dom::SVGSVGElement *root);
static void RestoreOldViewBox(dom::SVGSVGElement *root);
static void SaveOldZoomAndPan(dom::SVGSVGElement *root);
static void RestoreOldZoomAndPan(dom::SVGSVGElement *root);
static void SaveOldTransform(dom::SVGSVGElement *root);
static void RestoreOldTransform(dom::SVGSVGElement *root);
};
} // namespace mozilla
#endif // MOZILLA_SVGFRAGMENTIDENTIFIER_H__