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Gtk Webkit Overlay
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| const Gdk = imports.gi.Gdk; | |
| const Gio = imports.gi.Gio; | |
| const Gtk = imports.gi.Gtk; | |
| const WebKit2 = imports.gi.WebKit2; | |
| Gtk.init(null, 0); | |
| const HTML = '\ | |
| <html>\ | |
| <head>\ | |
| <style type="text/css">\ | |
| body {\ | |
| font-size: 50px;\ | |
| }\ | |
| #target {\ | |
| height: 100;\ | |
| background-color: red;\ | |
| }\ | |
| </style>\ | |
| </head>\ | |
| <body>\ | |
| <p>Web content. Web content. Web content. Web content.</p>\ | |
| <p>Web content. Web content. Web content. Web content.</p>\ | |
| <p>Web content. Web content. Web content. Web content.</p>\ | |
| <div id="target"></div>\ | |
| <p>Web content. Web content. Web content. Web content.</p>\ | |
| <p>Web content. Web content. Web content. Web content.</p>\ | |
| <p>Web content. Web content. Web content. Web content.</p>\ | |
| </body>\ | |
| </html>\ | |
| '; | |
| let context = WebKit2.WebContext.get_default(); | |
| context.connect('initialize-web-extensions', () => { | |
| context.set_web_extensions_directory('.'); | |
| }); | |
| let webview = new WebKit2.WebView(); | |
| webview.get_settings().enable_write_console_messages_to_stdout = true; | |
| webview.load_html(HTML, ''); | |
| let button = new Gtk.Button({ | |
| label: 'This is a gtk button. It tries to cover the red div.', | |
| expand: true, | |
| }); | |
| let overlay = new Gtk.Overlay(); | |
| overlay.add(webview); | |
| overlay.add_overlay(button); | |
| button.add_events(Gdk.EventMask.SCROLL_MASK); | |
| button.connect('scroll-event', (widget, event) => { | |
| webview.emit('scroll-event', event); | |
| return Gdk.EVENT_STOP; | |
| }); | |
| let rect = [-999, -999, 100, 100]; | |
| let connection = Gio.DBus.session; | |
| connection.signal_subscribe(null, | |
| 'com.endlessm.WebViewDemo', | |
| null, | |
| null, | |
| null, | |
| 0, | |
| (one, two, three, four, five, params) => { | |
| rect = params.deep_unpack()[0]; | |
| overlay.queue_resize(); | |
| }); | |
| overlay.connect('get-child-position', (overlay, button, allocation) => { | |
| printerr(rect); | |
| [allocation.x, allocation.y, allocation.width, allocation.height] = rect; | |
| return true; | |
| }); | |
| let test_window = new Gtk.Window({ | |
| default_width: 1000, | |
| default_height: 600, | |
| }); | |
| test_window.add(overlay); | |
| test_window.connect('destroy', () => { | |
| Gtk.main_quit(); | |
| }); | |
| test_window.show_all(); | |
| Gtk.main(); |
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| // Compile with | |
| // gcc webkitplugin.c `pkg-config --cflags --libs webkit2gtk-web-extension-4.0` -shared -fPIC -o webkitplugin.so | |
| #include <string.h> | |
| #include <webkit2/webkit-web-extension.h> | |
| #include <webkitdom/webkitdom.h> | |
| #define BUS_INTERFACE_NAME "com.endlessm.WebViewDemo" | |
| static GDBusConnection *connection; | |
| static GDBusInterfaceInfo *interface; | |
| static guint bus_id; | |
| static WebKitWebExtension *extension; | |
| static WebKitWebPage *page; | |
| static guint queued_update; | |
| static const gchar introspection_xml[] = | |
| "<node>" | |
| "<interface name='" BUS_INTERFACE_NAME "'>" | |
| "<signal name='Changed'>" | |
| "<arg name='dom_element_rectangle' type='(iiii)'/>" | |
| "</signal>" | |
| "</interface>" | |
| "</node>"; | |
| static gboolean | |
| update_div_position (WebKitDOMDOMWindow *window) | |
| { | |
| if (bus_id == 0) | |
| return FALSE; | |
| WebKitDOMDocument *document = webkit_web_page_get_dom_document (page); | |
| WebKitDOMElement *target = webkit_dom_document_get_element_by_id (document, "target"); | |
| WebKitDOMElement *body = WEBKIT_DOM_ELEMENT (webkit_dom_document_get_body (document)); | |
| glong scroll_left = webkit_dom_element_get_scroll_left (body); | |
| glong scroll_top = webkit_dom_element_get_scroll_top (body); | |
| gdouble left = webkit_dom_element_get_offset_left (target) - scroll_left; | |
| gdouble top = webkit_dom_element_get_offset_top (target) - scroll_top; | |
| GError *error = NULL; | |
| GVariant *params = g_variant_new ("((iiii))", | |
| (gint)left, | |
| (gint)top, | |
| (gint)webkit_dom_element_get_offset_width (target), | |
| (gint)webkit_dom_element_get_offset_height (target)); | |
| g_dbus_connection_emit_signal (connection, | |
| NULL, | |
| "/com/endlessm/webviewdemo", | |
| BUS_INTERFACE_NAME, | |
| "Changed", | |
| params, | |
| &error); | |
| queued_update = 0; | |
| return FALSE; | |
| } | |
| static void | |
| on_resize (WebKitDOMDOMWindow *window) | |
| { | |
| if (queued_update == 0) | |
| queued_update = g_idle_add ((GSourceFunc)update_div_position, window); | |
| } | |
| static void | |
| on_document_loaded (WebKitWebPage *p) | |
| { | |
| WebKitDOMDocument *document = webkit_web_page_get_dom_document (page); | |
| WebKitDOMDOMWindow *window = webkit_dom_document_get_default_view (document); | |
| update_div_position (window); | |
| webkit_dom_event_target_add_event_listener (WEBKIT_DOM_EVENT_TARGET (window), "resize", G_CALLBACK (on_resize), false, NULL); | |
| webkit_dom_event_target_add_event_listener (WEBKIT_DOM_EVENT_TARGET (window), "scroll", G_CALLBACK (update_div_position), false, NULL); | |
| } | |
| static void | |
| on_page_created (WebKitWebExtension *extension, | |
| WebKitWebPage *p) | |
| { | |
| page = p; | |
| g_signal_connect (page, "document-loaded", G_CALLBACK (on_document_loaded), NULL); | |
| } | |
| static void | |
| on_bus_acquired (GDBusConnection *con, | |
| const gchar *name) | |
| { | |
| GError *error = NULL; | |
| connection = con; | |
| GDBusNodeInfo *node = g_dbus_node_info_new_for_xml (introspection_xml, &error); | |
| if (node == NULL) | |
| goto fail; | |
| interface = g_dbus_node_info_lookup_interface (node, | |
| BUS_INTERFACE_NAME); | |
| if (interface == NULL) | |
| goto fail; | |
| bus_id = g_dbus_connection_register_object (connection, | |
| "/com/endlessm/webviewdemo", | |
| interface, | |
| NULL, | |
| NULL, | |
| NULL, | |
| &error); | |
| if (bus_id == 0) | |
| goto fail; | |
| return; | |
| fail: | |
| if (error != NULL) | |
| { | |
| g_critical ("Error hooking up web extension DBus interface: %s", | |
| error->message); | |
| g_clear_error (&error); | |
| } | |
| else | |
| { | |
| g_critical ("Unknown error hooking up web extension DBus interface"); | |
| } | |
| } | |
| static void | |
| on_name_lost (GDBusConnection *connection, | |
| const gchar *name) | |
| { | |
| if (connection == NULL) { | |
| g_error("Couldn't connect to DBus for name %s", name); | |
| return; | |
| } | |
| if (!g_dbus_connection_unregister_object (connection, bus_id)) | |
| g_critical ("Trouble unregistering object"); | |
| } | |
| void | |
| webkit_web_extension_initialize (WebKitWebExtension *ext) | |
| { | |
| extension = ext; | |
| g_print ("IN THE WEB EXTENSION!!\n"); | |
| g_signal_connect (extension, "page-created", | |
| G_CALLBACK (on_page_created), NULL); | |
| g_bus_own_name (G_BUS_TYPE_SESSION, | |
| "com.endlessm.webviewdemo", | |
| G_BUS_NAME_OWNER_FLAGS_NONE, | |
| (GBusAcquiredCallback) on_bus_acquired, | |
| NULL, | |
| (GBusNameLostCallback) on_name_lost, | |
| NULL, | |
| NULL); | |
| } |
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