From d1852b454716ccdaf686ba4c144b4da84a691fa7 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 7 Jun 2020 14:40:38 +0200
Subject: [PATCH] LibWeb: Add per-Frame EventHandler, handle mouse events
 recursively

We now handle mouse events by recursing into subframes. This makes
links, tooltips, etc, work inside <iframe> content.
---
 Libraries/LibWeb/Forward.h              |   1 +
 Libraries/LibWeb/Frame/EventHandler.cpp | 221 ++++++++++++++++++++++++
 Libraries/LibWeb/Frame/EventHandler.h   |  58 +++++++
 Libraries/LibWeb/Frame/Frame.cpp        |   2 +
 Libraries/LibWeb/Frame/Frame.h          |   8 +-
 Libraries/LibWeb/PageView.cpp           | 190 ++++++--------------
 Libraries/LibWeb/PageView.h             |  19 +-
 7 files changed, 355 insertions(+), 144 deletions(-)
 create mode 100644 Libraries/LibWeb/Frame/EventHandler.cpp
 create mode 100644 Libraries/LibWeb/Frame/EventHandler.h

diff --git a/Libraries/LibWeb/Forward.h b/Libraries/LibWeb/Forward.h
index ac10ad7245b..bae5ccb6963 100644
--- a/Libraries/LibWeb/Forward.h
+++ b/Libraries/LibWeb/Forward.h
@@ -32,6 +32,7 @@ class CanvasRenderingContext2D;
 class Document;
 class Element;
 class Event;
+class EventHandler;
 class EventListener;
 class EventTarget;
 class Frame;
diff --git a/Libraries/LibWeb/Frame/EventHandler.cpp b/Libraries/LibWeb/Frame/EventHandler.cpp
new file mode 100644
index 00000000000..c4d69ce7efc
--- /dev/null
+++ b/Libraries/LibWeb/Frame/EventHandler.cpp
@@ -0,0 +1,221 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <LibGUI/Event.h>
+#include <LibGUI/Window.h>
+#include <LibJS/Runtime/Value.h>
+#include <LibWeb/DOM/Document.h>
+#include <LibWeb/DOM/HTMLAnchorElement.h>
+#include <LibWeb/DOM/HTMLIFrameElement.h>
+#include <LibWeb/DOM/MouseEvent.h>
+#include <LibWeb/Frame/EventHandler.h>
+#include <LibWeb/Frame/Frame.h>
+#include <LibWeb/Layout/LayoutDocument.h>
+#include <LibWeb/PageView.h>
+
+namespace Web {
+
+static Gfx::Point compute_mouse_event_offset(const Gfx::Point& position, const LayoutNode& layout_node)
+{
+    auto top_left_of_layout_node = layout_node.box_type_agnostic_position();
+    return {
+        position.x() - static_cast<int>(top_left_of_layout_node.x()),
+        position.y() - static_cast<int>(top_left_of_layout_node.y())
+    };
+}
+
+EventHandler::EventHandler(Badge<Frame>, Frame& frame)
+    : m_frame(frame)
+{
+}
+
+EventHandler::~EventHandler()
+{
+}
+
+const LayoutDocument* EventHandler::layout_root() const
+{
+    if (!m_frame.document())
+        return nullptr;
+    return static_cast<LayoutDocument*>(m_frame.document()->layout_node());
+}
+
+LayoutDocument* EventHandler::layout_root()
+{
+    if (!m_frame.document())
+        return nullptr;
+    return const_cast<LayoutDocument*>(m_frame.document()->layout_node());
+}
+
+bool EventHandler::handle_mouseup(const Gfx::Point& position, unsigned button, unsigned modifiers)
+{
+    auto* layout_root_ptr = this->layout_root();
+    if (!layout_root_ptr)
+        return false;
+    auto& layout_root = *layout_root_ptr;
+    bool handled_event = false;
+
+    auto result = layout_root.hit_test(position);
+    if (result.layout_node && result.layout_node->node()) {
+        RefPtr<Node> node = result.layout_node->node();
+        if (is<HTMLIFrameElement>(*node)) {
+            if (auto* subframe = to<HTMLIFrameElement>(*node).hosted_frame())
+                return subframe->event_handler().handle_mouseup(position.translated(compute_mouse_event_offset({}, *result.layout_node)), button, modifiers);
+            return false;
+        }
+        auto offset = compute_mouse_event_offset(position, *result.layout_node);
+        node->dispatch_event(MouseEvent::create("mouseup", offset.x(), offset.y()));
+        handled_event = true;
+    }
+
+    if (button == GUI::MouseButton::Left) {
+        dump_selection("MouseUp");
+        m_in_mouse_selection = false;
+    }
+    return handled_event;
+}
+
+bool EventHandler::handle_mousedown(const Gfx::Point& position, unsigned button, unsigned modifiers)
+{
+    auto* layout_root_ptr = this->layout_root();
+    if (!layout_root_ptr)
+        return false;
+    auto& layout_root = *layout_root_ptr;
+    auto& document = *m_frame.document();
+    auto& page_view = *m_frame.page_view();
+
+    auto result = layout_root.hit_test(position);
+    if (!result.layout_node)
+        return false;
+
+    RefPtr<Node> node = result.layout_node->node();
+    document.set_hovered_node(node);
+    if (!node)
+        return false;
+
+    if (is<HTMLIFrameElement>(*node)) {
+        if (auto* subframe = to<HTMLIFrameElement>(*node).hosted_frame())
+            return subframe->event_handler().handle_mousedown(position.translated(compute_mouse_event_offset({}, *result.layout_node)), button, modifiers);
+        return false;
+    }
+
+    auto offset = compute_mouse_event_offset(position, *result.layout_node);
+    node->dispatch_event(MouseEvent::create("mousedown", offset.x(), offset.y()));
+    if (RefPtr<HTMLAnchorElement> link = node->enclosing_link_element()) {
+        dbg() << "Web::EventHandler: Clicking on a link to " << link->href();
+
+        if (button == GUI::MouseButton::Left) {
+            auto href = link->href();
+            if (href.starts_with("javascript:")) {
+                document.run_javascript(href.substring_view(11, href.length() - 11));
+            } else {
+                page_view.notify_link_click({}, m_frame, link->href(), link->target(), modifiers);
+            }
+        } else if (button == GUI::MouseButton::Right) {
+            page_view.notify_link_context_menu_request({}, m_frame, position, link->href(), link->target(), modifiers);
+        } else if (button == GUI::MouseButton::Middle) {
+            page_view.notify_link_middle_click({}, m_frame, link->href(), link->target(), modifiers);
+        }
+    } else {
+        if (button == GUI::MouseButton::Left) {
+            layout_root.selection().set({ result.layout_node, result.index_in_node }, {});
+            dump_selection("MouseDown");
+            m_in_mouse_selection = true;
+        }
+    }
+    return true;
+}
+
+bool EventHandler::handle_mousemove(const Gfx::Point& position, unsigned buttons, unsigned modifiers)
+{
+    auto* layout_root_ptr = this->layout_root();
+    if (!layout_root_ptr)
+        return false;
+    auto& layout_root = *layout_root_ptr;
+    auto& document = *m_frame.document();
+    auto& page_view = *m_frame.page_view();
+
+    bool hovered_node_changed = false;
+    bool is_hovering_link = false;
+    bool was_hovering_link = document.hovered_node() && document.hovered_node()->is_link();
+    auto result = layout_root.hit_test(position);
+    const HTMLAnchorElement* hovered_link_element = nullptr;
+    if (result.layout_node) {
+        RefPtr<Node> node = result.layout_node->node();
+
+        if (node && is<HTMLIFrameElement>(*node)) {
+            if (auto* subframe = to<HTMLIFrameElement>(*node).hosted_frame())
+                return subframe->event_handler().handle_mousemove(position.translated(compute_mouse_event_offset({}, *result.layout_node)), buttons, modifiers);
+            return false;
+        }
+
+        hovered_node_changed = node != document.hovered_node();
+        document.set_hovered_node(node);
+        if (node) {
+            hovered_link_element = node->enclosing_link_element();
+            if (hovered_link_element) {
+#ifdef HTML_DEBUG
+                dbg() << "PageView: hovering over a link to " << hovered_link_element->href();
+#endif
+                is_hovering_link = true;
+            }
+            auto offset = compute_mouse_event_offset(position, *result.layout_node);
+            node->dispatch_event(MouseEvent::create("mousemove", offset.x(), offset.y()));
+        }
+        if (m_in_mouse_selection) {
+            layout_root.selection().set_end({ result.layout_node, result.index_in_node });
+            dump_selection("MouseMove");
+            page_view.update();
+        }
+    }
+    if (page_view.window())
+        page_view.window()->set_override_cursor(is_hovering_link ? GUI::StandardCursor::Hand : GUI::StandardCursor::None);
+    if (hovered_node_changed) {
+        page_view.update();
+        RefPtr<HTMLElement> hovered_html_element = document.hovered_node() ? document.hovered_node()->enclosing_html_element() : nullptr;
+        if (hovered_html_element && !hovered_html_element->title().is_null()) {
+            page_view.notify_tooltip_area_enter({}, m_frame, position, hovered_html_element->title());
+        } else {
+            page_view.notify_tooltip_area_leave({}, m_frame);
+        }
+    }
+    if (is_hovering_link != was_hovering_link) {
+        page_view.notify_link_hover({}, m_frame, hovered_link_element ? document.complete_url(hovered_link_element->href()).to_string() : String());
+    }
+    return true;
+}
+
+void EventHandler::dump_selection(const char* event_name) const
+{
+    UNUSED_PARAM(event_name);
+#ifdef SELECTION_DEBUG
+    dbg() << event_name << " selection start: "
+          << layout_root()->selection().start().layout_node << ":" << layout_root()->selection().start().index_in_node << ", end: "
+          << layout_root()->selection().end().layout_node << ":" << layout_root()->selection().end().index_in_node;
+#endif
+}
+
+}
diff --git a/Libraries/LibWeb/Frame/EventHandler.h b/Libraries/LibWeb/Frame/EventHandler.h
new file mode 100644
index 00000000000..21f893617c9
--- /dev/null
+++ b/Libraries/LibWeb/Frame/EventHandler.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/Forward.h>
+#include <LibGUI/Forward.h>
+#include <LibGfx/Forward.h>
+#include <LibWeb/Forward.h>
+
+namespace Web {
+
+class Frame;
+
+class EventHandler {
+public:
+    explicit EventHandler(Badge<Frame>, Frame&);
+    ~EventHandler();
+
+    bool handle_mouseup(const Gfx::Point&, unsigned button, unsigned modifiers);
+    bool handle_mousedown(const Gfx::Point&, unsigned button, unsigned modifiers);
+    bool handle_mousemove(const Gfx::Point&, unsigned buttons, unsigned modifiers);
+
+private:
+    LayoutDocument* layout_root();
+    const LayoutDocument* layout_root() const;
+
+    void dump_selection(const char* event_name) const;
+
+    Frame& m_frame;
+
+    bool m_in_mouse_selection { false };
+};
+
+}
diff --git a/Libraries/LibWeb/Frame/Frame.cpp b/Libraries/LibWeb/Frame/Frame.cpp
index 221edad879d..ec73c378544 100644
--- a/Libraries/LibWeb/Frame/Frame.cpp
+++ b/Libraries/LibWeb/Frame/Frame.cpp
@@ -35,6 +35,7 @@ namespace Web {
 Frame::Frame(Element& host_element, Frame& main_frame)
     : m_main_frame(main_frame)
     , m_loader(*this)
+    , m_event_handler({}, *this)
     , m_host_element(host_element.make_weak_ptr())
 {
 }
@@ -42,6 +43,7 @@ Frame::Frame(Element& host_element, Frame& main_frame)
 Frame::Frame(PageView& page_view)
     : m_main_frame(*this)
     , m_loader(*this)
+    , m_event_handler({}, *this)
     , m_page_view(page_view.make_weak_ptr())
 {
 }
diff --git a/Libraries/LibWeb/Frame/Frame.h b/Libraries/LibWeb/Frame/Frame.h
index 3a84cdfd6ac..90ed25fb5ac 100644
--- a/Libraries/LibWeb/Frame/Frame.h
+++ b/Libraries/LibWeb/Frame/Frame.h
@@ -33,14 +33,12 @@
 #include <LibGfx/Bitmap.h>
 #include <LibGfx/Rect.h>
 #include <LibGfx/Size.h>
+#include <LibWeb/Frame/EventHandler.h>
 #include <LibWeb/Loader/FrameLoader.h>
 #include <LibWeb/TreeNode.h>
 
 namespace Web {
 
-class Document;
-class PageView;
-
 class Frame : public TreeNode<Frame> {
 public:
     static NonnullRefPtr<Frame> create_subframe(Element& host_element, Frame& main_frame) { return adopt(*new Frame(host_element, main_frame)); }
@@ -76,6 +74,9 @@ public:
     FrameLoader& loader() { return m_loader; }
     const FrameLoader& loader() const { return m_loader; }
 
+    EventHandler& event_handler() { return m_event_handler; }
+    const EventHandler& event_handler() const { return m_event_handler; }
+
     void scroll_to_anchor(const String&);
 
     Frame& main_frame() { return m_main_frame; }
@@ -91,6 +92,7 @@ private:
     Frame& m_main_frame;
 
     FrameLoader m_loader;
+    EventHandler m_event_handler;
 
     WeakPtr<Element> m_host_element;
     WeakPtr<PageView> m_page_view;
diff --git a/Libraries/LibWeb/PageView.cpp b/Libraries/LibWeb/PageView.cpp
index 2271b9f2909..4ed333bf01d 100644
--- a/Libraries/LibWeb/PageView.cpp
+++ b/Libraries/LibWeb/PageView.cpp
@@ -41,6 +41,7 @@
 #include <LibWeb/DOM/MouseEvent.h>
 #include <LibWeb/DOM/Text.h>
 #include <LibWeb/Dump.h>
+#include <LibWeb/Frame/EventHandler.h>
 #include <LibWeb/Frame/Frame.h>
 #include <LibWeb/Layout/LayoutDocument.h>
 #include <LibWeb/Layout/LayoutNode.h>
@@ -153,118 +154,29 @@ void PageView::paint_event(GUI::PaintEvent& event)
 
 void PageView::mousemove_event(GUI::MouseEvent& event)
 {
-    if (!layout_root())
-        return GUI::ScrollableWidget::mousemove_event(event);
-
-    bool hovered_node_changed = false;
-    bool is_hovering_link = false;
-    bool was_hovering_link = document()->hovered_node() && document()->hovered_node()->is_link();
-    auto result = layout_root()->hit_test(to_content_position(event.position()));
-    const HTMLAnchorElement* hovered_link_element = nullptr;
-    if (result.layout_node) {
-        RefPtr<Node> node = result.layout_node->node();
-        hovered_node_changed = node != document()->hovered_node();
-        document()->set_hovered_node(node);
-        if (node) {
-            hovered_link_element = node->enclosing_link_element();
-            if (hovered_link_element) {
-#ifdef HTML_DEBUG
-                dbg() << "PageView: hovering over a link to " << hovered_link_element->href();
-#endif
-                is_hovering_link = true;
-            }
-            auto offset = compute_mouse_event_offset(event.position(), *result.layout_node);
-            node->dispatch_event(MouseEvent::create("mousemove", offset.x(), offset.y()));
-        }
-        if (m_in_mouse_selection) {
-            layout_root()->selection().set_end({ result.layout_node, result.index_in_node });
-            dump_selection("MouseMove");
-            update();
-        }
+    if (main_frame().event_handler().handle_mousemove(to_content_position(event.position()), event.buttons(), event.modifiers())) {
+        event.accept();
+        return;
     }
-    if (window())
-        window()->set_override_cursor(is_hovering_link ? GUI::StandardCursor::Hand : GUI::StandardCursor::None);
-    if (hovered_node_changed) {
-        update();
-        RefPtr<HTMLElement> hovered_html_element = document()->hovered_node() ? document()->hovered_node()->enclosing_html_element() : nullptr;
-        if (hovered_html_element && !hovered_html_element->title().is_null()) {
-            auto screen_position = screen_relative_rect().location().translated(event.position());
-            GUI::Application::the().show_tooltip(hovered_html_element->title(), screen_position.translated(4, 4));
-        } else {
-            GUI::Application::the().hide_tooltip();
-        }
-    }
-    if (is_hovering_link != was_hovering_link) {
-        if (on_link_hover) {
-            on_link_hover(hovered_link_element ? document()->complete_url(hovered_link_element->href()).to_string() : String());
-        }
-    }
-    event.accept();
+    GUI::ScrollableWidget::mousemove_event(event);
 }
 
 void PageView::mousedown_event(GUI::MouseEvent& event)
 {
-    if (!layout_root())
-        return GUI::ScrollableWidget::mousemove_event(event);
-
-    bool hovered_node_changed = false;
-    auto result = layout_root()->hit_test(to_content_position(event.position()));
-    if (result.layout_node) {
-        RefPtr<Node> node = result.layout_node->node();
-        hovered_node_changed = node != document()->hovered_node();
-        document()->set_hovered_node(node);
-        if (node) {
-            auto offset = compute_mouse_event_offset(event.position(), *result.layout_node);
-            node->dispatch_event(MouseEvent::create("mousedown", offset.x(), offset.y()));
-            if (RefPtr<HTMLAnchorElement> link = node->enclosing_link_element()) {
-                dbg() << "PageView: clicking on a link to " << link->href();
-
-                if (event.button() == GUI::MouseButton::Left) {
-                    if (link->href().starts_with("javascript:")) {
-                        run_javascript_url(link->href());
-                    } else {
-                        if (on_link_click)
-                            on_link_click(link->href(), link->target(), event.modifiers());
-                    }
-                } else if (event.button() == GUI::MouseButton::Right) {
-                    if (on_link_context_menu_request)
-                        on_link_context_menu_request(link->href(), event.position().translated(screen_relative_rect().location()));
-                } else if (event.button() == GUI::MouseButton::Middle) {
-                    if (on_link_middle_click)
-                        on_link_middle_click(link->href());
-                }
-            } else {
-                if (event.button() == GUI::MouseButton::Left) {
-                    if (layout_root())
-                        layout_root()->selection().set({ result.layout_node, result.index_in_node }, {});
-                    dump_selection("MouseDown");
-                    m_in_mouse_selection = true;
-                }
-            }
-        }
+    if (main_frame().event_handler().handle_mousedown(to_content_position(event.position()), event.button(), event.modifiers())) {
+        event.accept();
+        return;
     }
-    if (hovered_node_changed)
-        update();
-    event.accept();
+    GUI::ScrollableWidget::mousedown_event(event);
 }
 
 void PageView::mouseup_event(GUI::MouseEvent& event)
 {
-    if (!layout_root())
-        return GUI::ScrollableWidget::mouseup_event(event);
-
-    auto result = layout_root()->hit_test(to_content_position(event.position()));
-    if (result.layout_node) {
-        if (RefPtr<Node> node = result.layout_node->node()) {
-            auto offset = compute_mouse_event_offset(event.position(), *result.layout_node);
-            node->dispatch_event(MouseEvent::create("mouseup", offset.x(), offset.y()));
-        }
-    }
-
-    if (event.button() == GUI::MouseButton::Left) {
-        dump_selection("MouseUp");
-        m_in_mouse_selection = false;
+    if (main_frame().event_handler().handle_mouseup(to_content_position(event.position()), event.button(), event.modifiers())) {
+        event.accept();
+        return;
     }
+    GUI::ScrollableWidget::mouseup_event(event);
 }
 
 void PageView::keydown_event(GUI::KeyEvent& event)
@@ -383,44 +295,12 @@ void PageView::set_document(Document* document)
     main_frame().set_document(document);
 }
 
-void PageView::dump_selection(const char* event_name)
-{
-    UNUSED_PARAM(event_name);
-#ifdef SELECTION_DEBUG
-    dbg() << event_name << " selection start: "
-          << layout_root()->selection().start().layout_node << ":" << layout_root()->selection().start().index_in_node << ", end: "
-          << layout_root()->selection().end().layout_node << ":" << layout_root()->selection().end().index_in_node;
-#endif
-}
-
 void PageView::did_scroll()
 {
     main_frame().set_viewport_rect(viewport_rect_in_content_coordinates());
     main_frame().did_scroll({});
 }
 
-Gfx::Point PageView::compute_mouse_event_offset(const Gfx::Point& event_position, const LayoutNode& layout_node) const
-{
-    auto content_event_position = to_content_position(event_position);
-    auto top_left_of_layout_node = layout_node.box_type_agnostic_position();
-
-    return {
-        content_event_position.x() - static_cast<int>(top_left_of_layout_node.x()),
-        content_event_position.y() - static_cast<int>(top_left_of_layout_node.y())
-    };
-}
-
-void PageView::run_javascript_url(const String& url)
-{
-    ASSERT(url.starts_with("javascript:"));
-    if (!document())
-        return;
-
-    auto source = url.substring_view(11, url.length() - 11);
-    dbg() << "running js from url: _" << source << "_";
-    document()->run_javascript(source);
-}
-
 void PageView::drop_event(GUI::DropEvent& event)
 {
     if (event.mime_data().has_urls()) {
@@ -432,4 +312,48 @@ void PageView::drop_event(GUI::DropEvent& event)
     ScrollableWidget::drop_event(event);
 }
 
+void PageView::notify_link_click(Badge<EventHandler>, Web::Frame&, const String& href, const String& target, unsigned modifiers)
+{
+    if (on_link_click)
+        on_link_click(href, target, modifiers);
+}
+
+void PageView::notify_link_middle_click(Badge<EventHandler>, Web::Frame&, const String& href, const String&, unsigned)
+{
+    if (on_link_middle_click)
+        on_link_middle_click(href);
+}
+
+Gfx::Point PageView::to_screen_position(const Web::Frame& frame, const Gfx::Point& frame_position) const
+{
+    Gfx::Point offset;
+    for (auto* f = &frame; f; f = f->parent()) {
+        auto f_position = f->host_element()->layout_node()->box_type_agnostic_position().to_int_point();
+        offset.move_by(f_position);
+    }
+    return screen_relative_rect().location().translated(offset).translated(frame_position);
+}
+
+void PageView::notify_link_context_menu_request(Badge<EventHandler>, Web::Frame& frame, const Gfx::Point& content_position, const String& href, const String&, unsigned)
+{
+    if (on_link_context_menu_request)
+        on_link_context_menu_request(href, to_screen_position(frame, content_position));
+}
+
+void PageView::notify_link_hover(Badge<EventHandler>, Web::Frame&, const String& href)
+{
+    if (on_link_hover)
+        on_link_hover(href);
+}
+
+void PageView::notify_tooltip_area_enter(Badge<EventHandler>, Web::Frame& frame, const Gfx::Point& content_position, const String& title)
+{
+    GUI::Application::the().show_tooltip(title, to_screen_position(frame, content_position));
+}
+
+void PageView::notify_tooltip_area_leave(Badge<EventHandler>, Web::Frame&)
+{
+    GUI::Application::the().hide_tooltip();
+}
+
 }
diff --git a/Libraries/LibWeb/PageView.h b/Libraries/LibWeb/PageView.h
index d2fa30fdb2b..0bd808c9880 100644
--- a/Libraries/LibWeb/PageView.h
+++ b/Libraries/LibWeb/PageView.h
@@ -29,13 +29,13 @@
 #include <AK/URL.h>
 #include <LibGUI/ScrollableWidget.h>
 #include <LibWeb/DOM/Document.h>
+#include <LibWeb/Forward.h>
 
 namespace Web {
 
-class Frame;
-
 class PageView : public GUI::ScrollableWidget {
-    C_OBJECT(PageView)
+    C_OBJECT(PageView);
+
 public:
     virtual ~PageView() override;
 
@@ -75,6 +75,13 @@ public:
 
     virtual bool accepts_focus() const override { return true; }
 
+    void notify_link_click(Badge<EventHandler>, Web::Frame&, const String& href, const String& target, unsigned modifiers);
+    void notify_link_middle_click(Badge<EventHandler>, Web::Frame&, const String& href, const String& target, unsigned modifiers);
+    void notify_link_context_menu_request(Badge<EventHandler>, Web::Frame&, const Gfx::Point& content_position, const String& href, const String& target, unsigned modifiers);
+    void notify_link_hover(Badge<EventHandler>, Web::Frame&, const String& href);
+    void notify_tooltip_area_enter(Badge<EventHandler>, Web::Frame&, const Gfx::Point& content_position, const String& title);
+    void notify_tooltip_area_leave(Badge<EventHandler>, Web::Frame&);
+
 protected:
     PageView();
 
@@ -89,17 +96,13 @@ protected:
 private:
     virtual void did_scroll() override;
 
-    RefPtr<Document> create_document_from_mime_type(const ByteBuffer& data, const URL& url, const String& mime_type, const String& encoding);
+    Gfx::Point to_screen_position(const Web::Frame&, const Gfx::Point&) const;
 
-    void run_javascript_url(const String& url);
     void layout_and_sync_size();
-    void dump_selection(const char* event_name);
-    Gfx::Point compute_mouse_event_offset(const Gfx::Point&, const LayoutNode&) const;
 
     RefPtr<Web::Frame> m_main_frame;
 
     bool m_should_show_line_box_borders { false };
-    bool m_in_mouse_selection { false };
 };
 
 }