LibWeb: Move the Page/Frame/EventHandler classes into Page/

6 files changed, 720 insertions, 0 deletions

diff --git a/Libraries/LibWeb/Page/EventHandler.cpp b/Libraries/LibWeb/Page/EventHandler.cpp
new file mode 100644
index 0000000000..0bb63b83b4
--- /dev/null
+++ b/Libraries/LibWeb/Page/EventHandler.cpp
@@ -0,0 +1,230 @@
+/*
+ * 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/HTML/HTMLAnchorElement.h>
+#include <LibWeb/HTML/HTMLIFrameElement.h>
+#include <LibWeb/Layout/LayoutDocument.h>
+#include <LibWeb/Page/EventHandler.h>
+#include <LibWeb/Page/Frame.h>
+#include <LibWeb/PageView.h>
+#include <LibWeb/UIEvents/MouseEvent.h>
+
+namespace Web {
+
+static Gfx::IntPoint compute_mouse_event_offset(const Gfx::IntPoint& 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 m_frame.document()->layout_node();
+}
+
+LayoutDocument* EventHandler::layout_root()
+{
+    if (!m_frame.document())
+        return nullptr;
+    return m_frame.document()->layout_node();
+}
+
+bool EventHandler::handle_mouseup(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
+{
+    if (!layout_root())
+        return false;
+    bool handled_event = false;
+
+    auto result = layout_root()->hit_test(position);
+    if (result.layout_node && result.layout_node->node()) {
+        RefPtr<DOM::Node> node = result.layout_node->node();
+        if (is<HTML::HTMLIFrameElement>(*node)) {
+            if (auto* subframe = downcast<HTML::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(UIEvents::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::IntPoint& position, unsigned button, unsigned modifiers)
+{
+    if (!layout_root())
+        return false;
+    NonnullRefPtr document = *m_frame.document();
+    auto& page_client = m_frame.page().client();
+
+    auto result = layout_root()->hit_test(position);
+    if (!result.layout_node)
+        return false;
+
+    RefPtr<DOM::Node> node = result.layout_node->node();
+    document->set_hovered_node(node);
+    if (!node)
+        return false;
+
+    if (is<HTML::HTMLIFrameElement>(*node)) {
+        if (auto* subframe = downcast<HTML::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(UIEvents::MouseEvent::create("mousedown", offset.x(), offset.y()));
+    if (!layout_root())
+        return true;
+
+    if (RefPtr<HTML::HTMLAnchorElement> link = node->enclosing_link_element()) {
+        auto href = link->href();
+        auto url = document->complete_url(href);
+        dbg() << "Web::EventHandler: Clicking on a link to " << url;
+        if (button == GUI::MouseButton::Left) {
+            auto href = link->href();
+            auto url = document->complete_url(href);
+            if (href.starts_with("javascript:")) {
+                document->run_javascript(href.substring_view(11, href.length() - 11));
+            } else if (href.starts_with('#')) {
+                auto anchor = href.substring_view(1, href.length() - 1);
+                m_frame.scroll_to_anchor(anchor);
+            } else {
+                if (m_frame.is_main_frame()) {
+                    page_client.page_did_click_link(url, link->target(), modifiers);
+                } else {
+                    // FIXME: Handle different targets!
+                    m_frame.loader().load(url, FrameLoader::Type::Navigation);
+                }
+            }
+        } else if (button == GUI::MouseButton::Right) {
+            page_client.page_did_request_link_context_menu(m_frame.to_main_frame_position(position), url, link->target(), modifiers);
+        } else if (button == GUI::MouseButton::Middle) {
+            page_client.page_did_middle_click_link(url, 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;
+        } else if (button == GUI::MouseButton::Right) {
+            page_client.page_did_request_context_menu(m_frame.to_main_frame_position(position));
+        }
+    }
+    return true;
+}
+
+bool EventHandler::handle_mousemove(const Gfx::IntPoint& position, unsigned buttons, unsigned modifiers)
+{
+    if (!layout_root())
+        return false;
+    auto& document = *m_frame.document();
+    auto& page_client = m_frame.page().client();
+
+    bool hovered_node_changed = false;
+    bool is_hovering_link = false;
+    auto result = layout_root()->hit_test(position);
+    const HTML::HTMLAnchorElement* hovered_link_element = nullptr;
+    if (result.layout_node) {
+        RefPtr<DOM::Node> node = result.layout_node->node();
+
+        if (node && is<HTML::HTMLIFrameElement>(*node)) {
+            if (auto* subframe = downcast<HTML::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(UIEvents::MouseEvent::create("mousemove", offset.x(), offset.y()));
+            if (!layout_root())
+                return true;
+        }
+        if (m_in_mouse_selection) {
+            layout_root()->selection().set_end({ result.layout_node, result.index_in_node });
+            dump_selection("MouseMove");
+            page_client.page_did_change_selection();
+        }
+    }
+    page_client.page_did_request_cursor_change(is_hovering_link ? GUI::StandardCursor::Hand : GUI::StandardCursor::None);
+    if (hovered_node_changed) {
+        RefPtr<HTML::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_client.page_did_enter_tooltip_area(m_frame.to_main_frame_position(position), hovered_html_element->title());
+        } else {
+            page_client.page_did_leave_tooltip_area();
+        }
+        if (is_hovering_link)
+            page_client.page_did_hover_link(document.complete_url(hovered_link_element->href()));
+        else
+            page_client.page_did_unhover_link();
+    }
+    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/Page/EventHandler.h b/Libraries/LibWeb/Page/EventHandler.h
new file mode 100644
index 0000000000..9a06a83c2e
--- /dev/null
+++ b/Libraries/LibWeb/Page/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::IntPoint&, unsigned button, unsigned modifiers);
+    bool handle_mousedown(const Gfx::IntPoint&, unsigned button, unsigned modifiers);
+    bool handle_mousemove(const Gfx::IntPoint&, 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/Page/Frame.cpp b/Libraries/LibWeb/Page/Frame.cpp
new file mode 100644
index 0000000000..5262c8bd36
--- /dev/null
+++ b/Libraries/LibWeb/Page/Frame.cpp
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 2018-2020, 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 <LibWeb/DOM/Document.h>
+#include <LibWeb/HTML/HTMLAnchorElement.h>
+#include <LibWeb/Layout/LayoutDocument.h>
+#include <LibWeb/Layout/LayoutWidget.h>
+#include <LibWeb/Page/Frame.h>
+#include <LibWeb/PageView.h>
+
+namespace Web {
+
+Frame::Frame(DOM::Element& host_element, Frame& main_frame)
+    : m_page(main_frame.page())
+    , m_main_frame(main_frame)
+    , m_loader(*this)
+    , m_event_handler({}, *this)
+    , m_host_element(host_element.make_weak_ptr())
+{
+}
+
+Frame::Frame(Page& page)
+    : m_page(page)
+    , m_main_frame(*this)
+    , m_loader(*this)
+    , m_event_handler({}, *this)
+{
+}
+
+Frame::~Frame()
+{
+}
+
+void Frame::set_document(DOM::Document* document)
+{
+    if (m_document == document)
+        return;
+
+    if (m_document)
+        m_document->detach_from_frame({}, *this);
+
+    m_document = document;
+
+    if (m_document)
+        m_document->attach_to_frame({}, *this);
+
+    page().client().page_did_set_document_in_main_frame(m_document);
+}
+
+void Frame::set_size(const Gfx::IntSize& size)
+{
+    if (m_size == size)
+        return;
+    m_size = size;
+    if (m_document)
+        m_document->layout();
+}
+
+void Frame::set_viewport_rect(const Gfx::IntRect& rect)
+{
+    if (m_viewport_rect == rect)
+        return;
+    m_viewport_rect = rect;
+
+    if (m_document && m_document->layout_node())
+        m_document->layout_node()->did_set_viewport_rect({}, rect);
+}
+
+void Frame::set_needs_display(const Gfx::IntRect& rect)
+{
+    if (!m_viewport_rect.intersects(rect))
+        return;
+
+    if (is_main_frame()) {
+        page().client().page_did_invalidate(to_main_frame_rect(rect));
+        return;
+    }
+
+    if (host_element() && host_element()->layout_node())
+        host_element()->layout_node()->set_needs_display();
+}
+
+void Frame::did_scroll(Badge<PageView>)
+{
+    if (!m_document)
+        return;
+    if (!m_document->layout_node())
+        return;
+    m_document->layout_node()->for_each_in_subtree_of_type<LayoutWidget>([&](auto& layout_widget) {
+        layout_widget.update_widget();
+        return IterationDecision::Continue;
+    });
+}
+
+void Frame::scroll_to_anchor(const String& fragment)
+{
+    if (!document())
+        return;
+
+    const auto* element = document()->get_element_by_id(fragment);
+    if (!element) {
+        auto candidates = document()->get_elements_by_name(fragment);
+        for (auto* candidate : candidates) {
+            if (is<HTML::HTMLAnchorElement>(*candidate)) {
+                element = downcast<HTML::HTMLAnchorElement>(candidate);
+                break;
+            }
+        }
+    }
+
+    if (!element || !element->layout_node())
+        return;
+
+    auto& layout_node = *element->layout_node();
+
+    Gfx::FloatRect float_rect { layout_node.box_type_agnostic_position(), { (float)viewport_rect().width(), (float)viewport_rect().height() } };
+    if (is<LayoutBox>(layout_node)) {
+        auto& layout_box = downcast<LayoutBox>(layout_node);
+        auto padding_box = layout_box.box_model().padding_box(layout_box);
+        float_rect.move_by(-padding_box.left, -padding_box.top);
+    }
+
+    page().client().page_did_request_scroll_into_view(enclosing_int_rect(float_rect));
+}
+
+Gfx::IntRect Frame::to_main_frame_rect(const Gfx::IntRect& a_rect)
+{
+    auto rect = a_rect;
+    rect.set_location(to_main_frame_position(a_rect.location()));
+    return rect;
+}
+
+Gfx::IntPoint Frame::to_main_frame_position(const Gfx::IntPoint& a_position)
+{
+    auto position = a_position;
+    for (auto* ancestor = parent(); ancestor; ancestor = ancestor->parent()) {
+        if (ancestor->is_main_frame())
+            break;
+        if (!ancestor->host_element())
+            return {};
+        if (!ancestor->host_element()->layout_node())
+            return {};
+        position.move_by(ancestor->host_element()->layout_node()->box_type_agnostic_position().to_type<int>());
+    }
+    return position;
+}
+
+}
diff --git a/Libraries/LibWeb/Page/Frame.h b/Libraries/LibWeb/Page/Frame.h
new file mode 100644
index 0000000000..07d2bf8a1a
--- /dev/null
+++ b/Libraries/LibWeb/Page/Frame.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2018-2020, 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/Function.h>
+#include <AK/Noncopyable.h>
+#include <AK/RefPtr.h>
+#include <AK/WeakPtr.h>
+#include <LibGfx/Bitmap.h>
+#include <LibGfx/Rect.h>
+#include <LibGfx/Size.h>
+#include <LibWeb/Loader/FrameLoader.h>
+#include <LibWeb/Page/EventHandler.h>
+#include <LibWeb/TreeNode.h>
+
+namespace Web {
+
+class Frame : public TreeNode<Frame> {
+public:
+    static NonnullRefPtr<Frame> create_subframe(DOM::Element& host_element, Frame& main_frame) { return adopt(*new Frame(host_element, main_frame)); }
+    static NonnullRefPtr<Frame> create(Page& page) { return adopt(*new Frame(page)); }
+    ~Frame();
+
+    bool is_main_frame() const { return this == &m_main_frame; }
+
+    const DOM::Document* document() const { return m_document; }
+    DOM::Document* document() { return m_document; }
+
+    void set_document(DOM::Document*);
+
+    Page& page() { return m_page; }
+    const Page& page() const { return m_page; }
+
+    const Gfx::IntSize& size() const { return m_size; }
+    void set_size(const Gfx::IntSize&);
+
+    void set_needs_display(const Gfx::IntRect&);
+
+    void set_viewport_rect(const Gfx::IntRect&);
+    Gfx::IntRect viewport_rect() const { return m_viewport_rect; }
+
+    void did_scroll(Badge<PageView>);
+
+    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(const Gfx::IntPoint&);
+    void scroll_to_anchor(const String&);
+
+    Frame& main_frame() { return m_main_frame; }
+    const Frame& main_frame() const { return m_main_frame; }
+
+    DOM::Element* host_element() { return m_host_element; }
+    const DOM::Element* host_element() const { return m_host_element; }
+
+    Gfx::IntPoint to_main_frame_position(const Gfx::IntPoint&);
+    Gfx::IntRect to_main_frame_rect(const Gfx::IntRect&);
+
+private:
+    explicit Frame(DOM::Element& host_element, Frame& main_frame);
+    explicit Frame(Page&);
+
+    Page& m_page;
+    Frame& m_main_frame;
+
+    FrameLoader m_loader;
+    EventHandler m_event_handler;
+
+    WeakPtr<DOM::Element> m_host_element;
+    RefPtr<DOM::Document> m_document;
+    Gfx::IntSize m_size;
+    Gfx::IntRect m_viewport_rect;
+};
+
+}
diff --git a/Libraries/LibWeb/Page/Page.cpp b/Libraries/LibWeb/Page/Page.cpp
new file mode 100644
index 0000000000..f02cfc9385
--- /dev/null
+++ b/Libraries/LibWeb/Page/Page.cpp
@@ -0,0 +1,68 @@
+/*
+ * 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 <LibWeb/Page/Frame.h>
+#include <LibWeb/Page/Page.h>
+#include <LibWeb/PageView.h>
+
+namespace Web {
+
+Page::Page(PageClient& client)
+    : m_client(client)
+{
+    m_main_frame = Frame::create(*this);
+}
+
+Page::~Page()
+{
+}
+
+void Page::load(const URL& url)
+{
+    main_frame().loader().load(url, FrameLoader::Type::Navigation);
+}
+
+Gfx::Palette Page::palette() const
+{
+    return m_client.palette();
+}
+
+bool Page::handle_mouseup(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
+{
+    return main_frame().event_handler().handle_mouseup(position, button, modifiers);
+}
+
+bool Page::handle_mousedown(const Gfx::IntPoint& position, unsigned button, unsigned modifiers)
+{
+    return main_frame().event_handler().handle_mousedown(position, button, modifiers);
+}
+
+bool Page::handle_mousemove(const Gfx::IntPoint& position, unsigned buttons, unsigned modifiers)
+{
+    return main_frame().event_handler().handle_mousemove(position, buttons, modifiers);
+}
+
+}
diff --git a/Libraries/LibWeb/Page/Page.h b/Libraries/LibWeb/Page/Page.h
new file mode 100644
index 0000000000..a0bf0b635f
--- /dev/null
+++ b/Libraries/LibWeb/Page/Page.h
@@ -0,0 +1,91 @@
+/*
+ * 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/Noncopyable.h>
+#include <AK/OwnPtr.h>
+#include <AK/RefPtr.h>
+#include <LibGUI/Window.h>
+#include <LibGfx/Forward.h>
+#include <LibGfx/Palette.h>
+#include <LibWeb/Forward.h>
+
+namespace Web {
+
+class PageClient;
+
+class Page {
+    AK_MAKE_NONCOPYABLE(Page);
+    AK_MAKE_NONMOVABLE(Page);
+
+public:
+    explicit Page(PageClient&);
+    ~Page();
+
+    PageClient& client() { return m_client; }
+    const PageClient& client() const { return m_client; }
+
+    Web::Frame& main_frame() { return *m_main_frame; }
+    const Web::Frame& main_frame() const { return *m_main_frame; }
+
+    void load(const URL&);
+
+    bool handle_mouseup(const Gfx::IntPoint&, unsigned button, unsigned modifiers);
+    bool handle_mousedown(const Gfx::IntPoint&, unsigned button, unsigned modifiers);
+    bool handle_mousemove(const Gfx::IntPoint&, unsigned buttons, unsigned modifiers);
+
+    Gfx::Palette palette() const;
+
+private:
+    PageClient& m_client;
+
+    RefPtr<Frame> m_main_frame;
+};
+
+class PageClient {
+public:
+    virtual Gfx::Palette palette() const = 0;
+    virtual void page_did_set_document_in_main_frame(DOM::Document*) { }
+    virtual void page_did_change_title(const String&) { }
+    virtual void page_did_start_loading(const URL&) { }
+    virtual void page_did_change_selection() { }
+    virtual void page_did_request_cursor_change(GUI::StandardCursor) { }
+    virtual void page_did_request_context_menu(const Gfx::IntPoint&) { }
+    virtual void page_did_request_link_context_menu(const Gfx::IntPoint&, const URL&, [[maybe_unused]] const String& target, [[maybe_unused]] unsigned modifiers) { }
+    virtual void page_did_click_link(const URL&, [[maybe_unused]] const String& target, [[maybe_unused]] unsigned modifiers) { }
+    virtual void page_did_middle_click_link(const URL&, [[maybe_unused]] const String& target, [[maybe_unused]] unsigned modifiers) { }
+    virtual void page_did_enter_tooltip_area(const Gfx::IntPoint&, const String&) { }
+    virtual void page_did_leave_tooltip_area() { }
+    virtual void page_did_hover_link(const URL&) { }
+    virtual void page_did_unhover_link() { }
+    virtual void page_did_invalidate(const Gfx::IntRect&) { }
+    virtual void page_did_change_favicon(const Gfx::Bitmap&) { }
+    virtual void page_did_layout() { }
+    virtual void page_did_request_scroll_into_view(const Gfx::IntRect&) { }
+};
+
+}