Unify backend instance creation.

webview/platform/linux/webview_linux_interface.xml

@@ -22,6 +22,12 @@
 			<arg type='b' name='accepted' direction='out'/>
 			<arg type='s' name='text' direction='out'/>
 		</method>
+		<method name='NavigationStateUpdate'>
+			<arg type='s' name='url' direction='in'/>
+			<arg type='s' name='title' direction='in'/>
+			<arg type='b' name='canGoBack' direction='in'/>
+			<arg type='b' name='canGoForward' direction='in'/>
+		</method>
 	</interface>
 	<interface name='org.desktop_app.GtkIntegration.Webview.Helper'>
 		<method name='Create'>

webview/platform/linux/webview_linux_webkitgtk.cpp

@@ -23,7 +23,7 @@
 
 #include <webview/webview.hpp>
 #include <crl/crl.h>
-#include <rpl/range.h>
+#include <rpl/rpl.h>
 #include <regex>
 
 namespace Webview::WebKitGTK {
@@ -67,22 +67,18 @@ class Instance final : public Interface, public ::base::has_weak_ptr {
 
 	ResolveResult resolve();
 
-	bool finishEmbedding() override;
-
 	void navigate(std::string url) override;
 	void navigateToData(std::string id) override;
 	void reload() override;
 
-	void resizeToWindow() override;
-
 	void init(std::string js) override;
 	void eval(std::string js) override;
 
 	void focus() override;
 
 	QWidget *widget() override;
-	void *winId() override;
 
+	void refreshNavigationHistoryState() override;
 	auto navigationHistoryState()
 		-> rpl::producer<NavigationHistoryState> override;
 
@@ -108,10 +104,13 @@ class Instance final : public Interface, public ::base::has_weak_ptr {
 
 	void startProcess();
 	void stopProcess();
+	void updateHistoryStates();
 
 	void registerMasterMethodHandlers();
 	void registerHelperMethodHandlers();
 
+	void *winId();
+
 	bool _remoting = false;
 	bool _connected = false;
 	Master _master;
@@ -134,6 +133,7 @@ class Instance final : public Interface, public ::base::has_weak_ptr {
 	std::function<bool(std::string,bool)> _navigationStartHandler;
 	std::function<void(bool)> _navigationDoneHandler;
 	std::function<DialogResult(DialogArgs)> _dialogHandler;
+	rpl::variable<NavigationHistoryState> _navigationHistoryState;
 	bool _loadFailed = false;
 
 };
@@ -350,6 +350,26 @@ bool Instance::create(Config config) {
 			instance->loadChanged(loadEvent);
 		}),
 		this);
+	g_signal_connect_swapped(
+		_webview,
+		"notify::uri",
+		G_CALLBACK(+[](
+			Instance *instance,
+			GParamSpec *pspec) -> gboolean {
+			instance->updateHistoryStates();
+			return true;
+		}),
+		this);
+	g_signal_connect_swapped(
+		_webview,
+		"notify::title",
+		G_CALLBACK(+[](
+			Instance *instance,
+			GParamSpec *pspec) -> gboolean {
+			instance->updateHistoryStates();
+			return true;
+		}),
+		this);
 	g_signal_connect_swapped(
 		_webview,
 		"decide-policy",
@@ -447,6 +467,7 @@ void Instance::loadChanged(WebKitLoadEvent loadEvent) {
 			_master.call_navigation_done(!_loadFailed, nullptr);
 		}
 	}
+	updateHistoryStates();
 }
 
 bool Instance::decidePolicy(
@@ -564,10 +585,6 @@ ResolveResult Instance::resolve() {
 	return Resolve(_wayland);
 }
 
-bool Instance::finishEmbedding() {
-	return true;
-}
-
 void Instance::navigate(std::string url) {
 	if (_remoting) {
 		if (!_helper) {
@@ -651,6 +668,9 @@ void Instance::eval(std::string js) {
 }
 
 void Instance::focus() {
+	if (const auto widget = _widget.get()) {
+		widget->activateWindow();
+	}
 }
 
 QWidget *Instance::widget() {
@@ -689,9 +709,13 @@ void *Instance::winId() {
 	return reinterpret_cast<void*>(gtk_plug_get_id(GTK_PLUG(_window)));
 }
 
+void Instance::refreshNavigationHistoryState() {
+	// Not needed here, there are events.
+}
+
 auto Instance::navigationHistoryState()
 -> rpl::producer<NavigationHistoryState> {
-	return rpl::single(NavigationHistoryState());
+	return _navigationHistoryState.value();
 }
 
 void Instance::setOpaqueBg(QColor opaqueBg) {
@@ -728,9 +752,6 @@ void Instance::setOpaqueBg(QColor opaqueBg) {
 	}
 }
 
-void Instance::resizeToWindow() {
-}
-
 void Instance::startProcess() {
 	auto loop = GLib::MainLoop::new_();
 
@@ -864,6 +885,17 @@ void Instance::stopProcess() {
 	}
 }
 
+void Instance::updateHistoryStates() {
+	const auto url = webkit_web_view_get_uri(_webview);
+	const auto title = webkit_web_view_get_title(_webview);
+	_master.call_navigation_state_update(
+		url ? url : "",
+		title ? title : "",
+		webkit_web_view_can_go_back(_webview),
+		webkit_web_view_can_go_forward(_webview),
+		nullptr);
+}
+
 void Instance::registerMasterMethodHandlers() {
 	if (!_master) {
 		return;
@@ -970,6 +1002,22 @@ void Instance::registerMasterMethodHandlers() {
 
 		return true;
 	});
+
+	_master.signal_handle_navigation_state_update().connect([=](
+			Master,
+			Gio::DBusMethodInvocation invocation,
+			const std::string &url,
+			const std::string &title,
+			bool canGoBack,
+			bool canGoForward) {
+		_navigationHistoryState = NavigationHistoryState{
+			.url = url,
+			.title = title,
+			.canGoBack = canGoBack,
+			.canGoForward = canGoForward,
+		};
+		return true;
+	});
 }
 
 int Instance::exec() {

webview/platform/linux/webview_linux_webkitgtk_library.cpp

@@ -56,6 +56,10 @@ ResolveResult Resolve(bool wayland) {
 		&& LOAD_LIBRARY_SYMBOL(lib, webkit_script_dialog_prompt_set_text)
 		&& LOAD_LIBRARY_SYMBOL(lib, webkit_web_view_get_type)
 		&& LOAD_LIBRARY_SYMBOL(lib, webkit_web_view_get_user_content_manager)
+		&& LOAD_LIBRARY_SYMBOL(lib, webkit_web_view_get_uri)
+		&& LOAD_LIBRARY_SYMBOL(lib, webkit_web_view_get_title)
+		&& LOAD_LIBRARY_SYMBOL(lib, webkit_web_view_can_go_back)
+		&& LOAD_LIBRARY_SYMBOL(lib, webkit_web_view_can_go_forward)
 		&& LOAD_LIBRARY_SYMBOL(lib, webkit_user_content_manager_register_script_message_handler)
 		&& LOAD_LIBRARY_SYMBOL(lib, webkit_web_view_get_settings)
 		&& LOAD_LIBRARY_SYMBOL(lib, webkit_settings_set_enable_developer_extras)

webview/platform/linux/webview_linux_webkitgtk_library.h

@@ -185,6 +185,10 @@ inline GtkWidget *(*webkit_web_view_new_with_context)(WebKitWebContext *context)
 inline GType (*webkit_web_view_get_type)(void);
 inline WebKitUserContentManager *(*webkit_web_view_get_user_content_manager)(
 	WebKitWebView *web_view);
+inline const gchar *(*webkit_web_view_get_uri)(WebKitWebView *web_view);
+inline const gchar *(*webkit_web_view_get_title)(WebKitWebView *web_view);
+inline gboolean (*webkit_web_view_can_go_back)(WebKitWebView *web_view);
+inline gboolean (*webkit_web_view_can_go_forward)(WebKitWebView *web_view);
 inline gboolean (*webkit_user_content_manager_register_script_message_handler)(
 	WebKitUserContentManager *manager,
 	const gchar *name,