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251 lines
6.9 KiB
Plaintext
251 lines
6.9 KiB
Plaintext
Events
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This file lists the events currently in use, when they are called, what they
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do and what arguments they expect.
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Events are a mechanism for communication between ELinks parts --- any ELinks
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subsystem (module) can register an event, hook at an event or trigger an event.
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Events are designed to allow transition to a completely message-passing model
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internally, with modules talking to each other through the events.
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Events are currently used primarily as a generic way to trigger event handlers
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in various scripting backends.
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Therefore, so far this reference sheet is useful mainly to scripting backends
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developers and also scripting power users - it looks at the C side but usually
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you get most (if not all) of it passed to the hook functions in your scripts.
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Below is a template showing how to read the event information
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Name: <event name>
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Managed By: <what part of the code registers and unregister the event>
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Triggered When:
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<short description of when the event is triggered>
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Arguments:
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<the order and type of the arguments>
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Description:
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<description of the arguments, what the event does etc.>
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Please keep in alphabetical order!
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The list of events itself:
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-------------------------------------------------------------------------------
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Name: bookmark-delete
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Managed By: The bookmarks subsystem
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Triggered When:
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A bookmark is being deleted.
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Arguments:
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struct bookmark *bookmark
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Description:
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Currently only used by the tab snapshotting code to avoid a dangling pointer
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should the deleted bookmark be the folder to which it made the last snapshot.
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-------------------------------------------------------------------------------
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Name: bookmark-move
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Managed By: The bookmarks subsystem
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Triggered When:
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A bookmark is being moved.
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Arguments:
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struct bookmark *bookmark
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struct bookmark *destination
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Description:
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The bookmark is moved immediately after the destination bookmark.
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This is currently only used by the tab snapshotting code, which assumes
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that when a user moves a bookmark, the user does not want the snapshotting
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code to delete it when it makes the next snapshot.
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-------------------------------------------------------------------------------
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Name: bookmark-update
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Managed By: The bookmarks subsystem
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Triggered When:
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The user finishes editing a bookmark.
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Arguments:
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struct bookmark *bookmark
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unsigned char *new_title /* UTF-8 */
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unsigned char *new_url /* UTF-8 */
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Description:
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This is triggered before the new title and URL are assigned to the bookmark.
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Therefore, handlers can get the old title and URL from the bookmark structure
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and the new title and URL from the event arguments.
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This is currently only used by the tab snapshotting code, which assumes
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that when a user edits a bookmark, the user does not want the snapshotting
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code to delete it when it makes the next snapshot.
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-------------------------------------------------------------------------------
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Name: dialog-lua-console
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Managed By: The Lua scripting subsystem/backend
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Triggered When:
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The user hits a key associated with 'lua-console' action.
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Arguments:
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struct session *ses
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Description:
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Open Lua console dialog.
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-------------------------------------------------------------------------------
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Name: follow-url
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Managed By: The scripting subsystem/backends
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Triggered When:
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The user decides to load some document by following a link, entering a URL
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in the goto URL dialog, loading frames from a frameset (?) etc.
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Arguments:
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unsigned char **url, struct session *ses
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Description:
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If another URL than @url should be followed it is passed by setting @url.
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If @url is changed the event propagation should be ended.
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Valid values for @url includes:
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- unchanged, if the original URL should be followed;
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- a new, dynamically allocated URL to be followed instead; or
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- NULL or an empty, dynamically allocated string if no URL should be followed.
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-------------------------------------------------------------------------------
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Name: free-history
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Managed By: The scripting subsystem/backends
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Triggered When:
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ELinks exits
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Arguments:
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None
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Description:
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Allow a subsystem to free its history lists.
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-------------------------------------------------------------------------------
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Name: get-proxy
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Managed By: The scripting subsystem/backends
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Triggered When:
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Determining what proxy, if any, should be used to load a requested URL.
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Arguments:
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unsigned char **new_proxy_url, unsigned char *url
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Description:
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Possible values for @new_proxy_url includes:
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- a dynamically allocated string with the format proxy:port;
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- an empty string (dynamically allocated!) to use no proxy; or
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- NULL to use the default proxies.
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-------------------------------------------------------------------------------
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Name: goto-url
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Managed By: The scripting subsystem/backends
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Triggered When:
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The user enters something into the goto URL dialog.
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Arguments:
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unsigned char **url, struct session *ses
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Description:
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If a URL other than @url should be followed, the old one should be freed
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and the new one should be assigned to @url. @url must not be assigned
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NULL and must remain freeable.
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Valid values for @url are:
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- unchanged, if the original URL should be followed;
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- a new, dynamically allocated URL to be followed instead; or
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- NULL or an empty, dynamically allocated string if no URL should be followed.
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@ses is usually used for deciding based on the current URI or for reporting
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potential errors during the hook processing through the UI. With @ses being
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NULL the hook handler should assume no current URI and no suitable UI set up
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(i.e., starting up yet or -dump).
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-------------------------------------------------------------------------------
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Name: periodic-saving
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Managed By: No maintainer but used by lowlevel/timer.*
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Triggered When:
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The interval timer configured through option goes off.
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Arguments:
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none
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Description:
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Makes it possible to periodically save files in ~/.config/elinks to disk.
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-------------------------------------------------------------------------------
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Name: pre-format-html
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Managed By: The scripting subsystem/backends
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Triggered When:
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A HTML document has been loaded - before the document rendering begins.
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Arguments:
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struct session *ses
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struct cache_entry *cached
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Description:
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Makes it possible to fix up bad HTML code, remove tags etc. The parameter
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cached is guaranteed to have a single fragment. The HTML source is changed
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by replacing this fragment:
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add_fragment(cached, 0, new_string, new_len);
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normalize_cache_entry(cached, new_len);
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The caller must ensure that there is a reference to cached, so that
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calling garbage_collection() from the event handler cannot free it.
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-------------------------------------------------------------------------------
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Name: quit
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Managed By: The scripting subsystem/backends
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Triggered When:
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ELinks quits
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Arguments:
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None
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Description:
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Allows a subsystem to do whatever clean-up is required when ELinks quits.
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-------------------------------------------------------------------------------
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