LibWeb: Add the PageTransitionEvent interface and fire "pageshow" events

We now fire "pageshow" events at the appropriate time during document
loading (done by the parser.)

Note that there are no corresponding "pagehide" events yet.

2 files changed, 21 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/DOM/Window.cpp b/Userland/Libraries/LibWeb/DOM/Window.cpp
index 3e2532e9b5..5806c8418c 100644
--- a/Userland/Libraries/LibWeb/DOM/Window.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Window.cpp
@@ -12,6 +12,7 @@
 #include <LibWeb/DOM/EventDispatcher.h>
 #include <LibWeb/DOM/Timer.h>
 #include <LibWeb/DOM/Window.h>
+#include <LibWeb/HTML/PageTransitionEvent.h>
 #include <LibWeb/HighResolutionTime/Performance.h>
 #include <LibWeb/Layout/InitialContainingBlock.h>
 #include <LibWeb/Page/BrowsingContext.h>
@@ -276,4 +277,22 @@ float Window::scroll_y() const
     return 0;
 }
 
+// https://html.spec.whatwg.org/#fire-a-page-transition-event
+void Window::fire_a_page_transition_event(FlyString event_name, bool persisted)
+{
+    // To fire a page transition event named eventName at a Window window with a boolean persisted,
+    // fire an event named eventName at window, using PageTransitionEvent,
+    // with the persisted attribute initialized to persisted,
+    auto event = HTML::PageTransitionEvent::create(move(event_name), persisted);
+
+    // ...the cancelable attribute intialized to true,
+    event->set_cancelable(true);
+
+    // the bubbles attribute initialized to true,
+    event->set_bubbles(true);
+
+    // and legacy target override flag set.
+    dispatch_event(move(event));
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Window.h b/Userland/Libraries/LibWeb/DOM/Window.h
index f17873cf49..7800d25cbb 100644
--- a/Userland/Libraries/LibWeb/DOM/Window.h
+++ b/Userland/Libraries/LibWeb/DOM/Window.h
@@ -83,6 +83,8 @@ public:
     float scroll_x() const;
     float scroll_y() const;
 
+    void fire_a_page_transition_event(FlyString event_name, bool persisted);
+
 private:
     explicit Window(Document&);