gecko/docshell/base/IHistory.h

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 * for the specific language governing rights and limitations under the
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 *
 * The Original Code is the mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Shawn Wilsher <me@shawnwilsher.com> (Original Author)
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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#ifndef mozilla_IHistory_h_
#define mozilla_IHistory_h_

#include "nsISupports.h"

class nsIURI;

namespace mozilla {

    namespace dom {
        class Link;
    }

#define IHISTORY_IID \
  {0x6f736049, 0x6370, 0x4376, {0xb7, 0x17, 0xfa, 0xfc, 0x0b, 0x4f, 0xd0, 0xf1}}

class IHistory : public nsISupports
{
public:
    NS_DECLARE_STATIC_IID_ACCESSOR(IHISTORY_IID)

    /**
     * Registers the Link for notifications about the visited-ness of aURI.
     * Consumers should assume that the URI is unvisited after calling this, and
     * they will be notified if that state (unvisited) changes by having
     * SetLinkState called on themselves.  This function is guaranteed to run to
     * completion before aLink is notified.  After the node is notified, it will
     * be unregistered.
     *
     * @note SetLinkState must not call RegisterVisitedCallback or
     *       UnregisterVisitedCallback.
     *
     * @pre aURI must not be null.
     * @pre aLink must not be null.
     *
     * @param aURI
     *        The URI to check.
     * @param aLink
     *        The link to update whenever the history status changes.  The
     *        implementation will only hold onto a raw pointer, so if this
     *        object should be destroyed, be sure to call
     *        UnregisterVistedCallback first.
     */
    NS_IMETHOD RegisterVisitedCallback(nsIURI *aURI, dom::Link *aLink) = 0;

    /**
     * Unregisters a previously registered Link object.  This must be called
     * before destroying the registered object.
     *
     * @pre aURI must not be null.
     * @pre aLink must not be null.
     *
     * @param aURI
     *        The URI that aLink was registered for.
     * @param aLink
     *        The link object to unregister for aURI.
     */
    NS_IMETHOD UnregisterVisitedCallback(nsIURI *aURI, dom::Link *aLink) = 0;

    enum VisitFlags {
        /**
         * Indicates whether the URI was loaded in a top-level window.
         */
        TOP_LEVEL = 1 << 0,
        /**
         * Indicates whether the URI was loaded as part of a permanent redirect.
         */
        REDIRECT_PERMANENT = 1 << 1,
        /**
         * Indicates whether the URI was loaded as part of a temporary redirect.
         */
        REDIRECT_TEMPORARY = 1 << 2
    };

    /**
     * Adds a history visit for the URI.
     *
     * @pre aURI must not be null.
     *
     * @param aURI
     *        The URI of the page being visited.
     * @param aLastVisitedURI
     *        The URI of the last visit in the chain.
     * @param aFlags
     *        The VisitFlags describing this visit.
     */
    NS_IMETHOD VisitURI(
        nsIURI *aURI,
        nsIURI *aLastVisitedURI,
        PRUint32 aFlags
    ) = 0;
};

NS_DEFINE_STATIC_IID_ACCESSOR(IHistory, IHISTORY_IID)

#define NS_DECL_IHISTORY \
    NS_IMETHOD RegisterVisitedCallback(nsIURI *aURI, \
                                       mozilla::dom::Link *aContent); \
    NS_IMETHOD UnregisterVisitedCallback(nsIURI *aURI, \
                                         mozilla::dom::Link *aContent); \
    NS_IMETHOD VisitURI(nsIURI *aURI, \
                        nsIURI *aLastVisitedURI, \
                        PRUint32 aFlags);

} // namespace mozilla

#endif // mozilla_IHistory_h_