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WebKitWebExtension is a loadable module for the WebProcess. It allows you to execute code in the WebProcess and being able to use the DOM API, to change any request or to inject custom JavaScript code, for example.
To create a WebKitWebExtension you should write a module with an initialization function that could
be either webkit_web_extension_initialize() with prototype WebKitWebExtensionInitializeFunction or
webkit_web_extension_initialize_with_user_data() with prototype WebKitWebExtensionInitializeWithUserDataFunction.
This function has to be public and it has to use the G_MODULE_EXPORT macro. It is called when the
web process is initialized.
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static void web_page_created_callback (WebKitWebExtension *extension, WebKitWebPage *web_page, gpointer user_data) { g_print ("Page %d created for %s\n", webkit_web_page_get_id (web_page), webkit_web_page_get_uri (web_page)); } G_MODULE_EXPORT void webkit_web_extension_initialize (WebKitWebExtension *extension) { g_signal_connect (extension, "page-created", G_CALLBACK (web_page_created_callback), NULL); } |
The previous piece of code shows a trivial example of an extension that notifies when a WebKitWebPage is created.
WebKit has to know where it can find the created WebKitWebExtension. To do so you
should use the webkit_web_context_set_web_extensions_directory() function. The signal
“initialize-web-extensions” is the recommended place to call it.
To provide the initialization data used by the webkit_web_extension_initialize_with_user_data()
function, you have to call webkit_web_context_set_web_extensions_initialization_user_data() with
the desired data as parameter. You can see an example of this in the following piece of code:
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#define WEB_EXTENSIONS_DIRECTORY /* ... */ static void initialize_web_extensions (WebKitWebContext *context, gpointer user_data) { /* Web Extensions get a different ID for each Web Process */ static guint32 unique_id = 0; webkit_web_context_set_web_extensions_directory ( context, WEB_EXTENSIONS_DIRECTORY); webkit_web_context_set_web_extensions_initialization_user_data ( context, g_variant_new_uint32 (unique_id++)); } int main (int argc, char **argv) { g_signal_connect (webkit_web_context_get_default (), "initialize-web-extensions", G_CALLBACK (initialize_web_extensions), NULL); GtkWidget *view = webkit_web_view_new (); /* ... */ } |
void
(*WebKitWebExtensionInitializeFunction)
(WebKitWebExtension *extension);
Type definition for a function that will be called to initialize the web extension when the web process starts.
void (*WebKitWebExtensionInitializeWithUserDataFunction) (WebKitWebExtension *extension,const GVariant *user_data);
Type definition for a function that will be called to initialize
the web extensions when the web process starts, and which receives
as additional argument the user data set with
webkit_web_context_set_web_extensions_initialization_user_data().
Since: 2.4
WebKitWebPage * webkit_web_extension_get_page (WebKitWebExtension *extension,guint64 page_id);
Get the web page of the given page_id
.
the WebKitWebPage for the given page_id
, or NULL if the
identifier doesn't correspond to an exsiting web page.
[transfer none]
“page-created” signalvoid user_function (WebKitWebExtension *extension, WebKitWebPage *web_page, gpointer user_data)
This signal is emitted when a new WebKitWebPage is created in the Web Process.
extension |
the WebKitWebExtension on which the signal is emitted |
|
web_page |
the WebKitWebPage created |
|
user_data |
user data set when the signal handler was connected. |
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