Browser: Start implementing tabbed browsing! :^)

This patch moves most of the Browser UI into a Tab class. The main UI
now mainly consists of a GUI::TabWidget that Tab objects are added to.

I'm going with the "tabs on top" style here, since I like how it makes
it feel like each tab has its own UI controls (which it actually does!)

4 files changed, 382 insertions, 236 deletions

diff --git a/Applications/Browser/Makefile b/Applications/Browser/Makefile
index ce65632cd4..dd8d297395 100755
--- a/Applications/Browser/Makefile
+++ b/Applications/Browser/Makefile
@@ -1,7 +1,8 @@
 OBJS = \
-    main.o \
+    BookmarksBarWidget.o \
     InspectorWidget.o \
-	BookmarksBarWidget.o
+    Tab.o \
+    main.o
 
 PROGRAM = Browser
 
diff --git a/Applications/Browser/Tab.cpp b/Applications/Browser/Tab.cpp
new file mode 100644
index 0000000000..b48cfdc1bd
--- /dev/null
+++ b/Applications/Browser/Tab.cpp
@@ -0,0 +1,284 @@
+/*
+ * 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 "Tab.h"
+#include "BookmarksBarWidget.h"
+#include "History.h"
+#include "InspectorWidget.h"
+#include <LibGUI/AboutDialog.h>
+#include <LibGUI/Action.h>
+#include <LibGUI/Application.h>
+#include <LibGUI/BoxLayout.h>
+#include <LibGUI/Button.h>
+#include <LibGUI/Menu.h>
+#include <LibGUI/MenuBar.h>
+#include <LibGUI/StatusBar.h>
+#include <LibGUI/TextBox.h>
+#include <LibGUI/ToolBar.h>
+#include <LibGUI/ToolBarContainer.h>
+#include <LibGUI/Window.h>
+#include <LibWeb/CSS/StyleResolver.h>
+#include <LibWeb/DOM/Element.h>
+#include <LibWeb/DOMTreeModel.h>
+#include <LibWeb/Dump.h>
+#include <LibWeb/Frame.h>
+#include <LibWeb/HtmlView.h>
+#include <LibWeb/Layout/LayoutBlock.h>
+#include <LibWeb/Layout/LayoutDocument.h>
+#include <LibWeb/Layout/LayoutInline.h>
+#include <LibWeb/Layout/LayoutNode.h>
+#include <LibWeb/Parser/CSSParser.h>
+#include <LibWeb/Parser/HTMLParser.h>
+#include <LibWeb/ResourceLoader.h>
+
+namespace Browser {
+
+static const char* home_url = "file:///home/anon/www/welcome.html";
+static const char* bookmarks_filename = "/home/anon/bookmarks.json";
+
+Tab::Tab()
+{
+    auto& widget = *this;
+    auto& layout = set_layout<GUI::VerticalBoxLayout>();
+    layout.set_margins({ 1, 1, 1, 1 });
+
+    bool bookmarksbar_enabled = true;
+
+    auto& toolbar_container = widget.add<GUI::ToolBarContainer>();
+    auto& toolbar = toolbar_container.add<GUI::ToolBar>();
+    m_bookmarks_bar = toolbar_container.add<BookmarksBarWidget>(bookmarks_filename, bookmarksbar_enabled);
+    m_html_widget = widget.add<Web::HtmlView>();
+
+    m_bookmarks_bar->on_bookmark_click = [this](auto&, auto& url) {
+        m_html_widget->load(url);
+    };
+
+    m_go_back_action = GUI::CommonActions::make_go_back_action([this](auto&) {
+        m_history.go_back();
+        update_actions();
+        TemporaryChange<bool> change(m_should_push_loads_to_history, false);
+        m_html_widget->load(m_history.current());
+    });
+
+    m_go_forward_action = GUI::CommonActions::make_go_forward_action([this](auto&) {
+        m_history.go_forward();
+        update_actions();
+        TemporaryChange<bool> change(m_should_push_loads_to_history, false);
+        m_html_widget->load(m_history.current());
+    });
+
+    toolbar.add_action(*m_go_back_action);
+    toolbar.add_action(*m_go_forward_action);
+
+    toolbar.add_action(GUI::CommonActions::make_go_home_action([this](auto&) {
+        m_html_widget->load(home_url);
+    }));
+
+    toolbar.add_action(GUI::CommonActions::make_reload_action([this](auto&) {
+        TemporaryChange<bool> change(m_should_push_loads_to_history, false);
+        m_html_widget->reload();
+    }));
+
+    m_location_box = toolbar.add<GUI::TextBox>();
+
+    m_location_box->on_return_pressed = [this] {
+        m_html_widget->load(m_location_box->text());
+    };
+
+    m_bookmark_button = toolbar.add<GUI::Button>();
+    m_bookmark_button->set_button_style(Gfx::ButtonStyle::CoolBar);
+    m_bookmark_button->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/star-black.png"));
+    m_bookmark_button->set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
+    m_bookmark_button->set_preferred_size(22, 22);
+
+    m_bookmark_button->on_click = [this] {
+        auto url = m_html_widget->main_frame().document()->url().to_string();
+        if (m_bookmarks_bar->contains_bookmark(url)) {
+            m_bookmarks_bar->remove_bookmark(url);
+        } else {
+            m_bookmarks_bar->add_bookmark(url, m_title);
+        }
+        update_bookmark_button(url);
+    };
+
+    m_html_widget->on_load_start = [this](auto& url) {
+        m_location_box->set_text(url.to_string());
+        if (m_should_push_loads_to_history)
+            m_history.push(url);
+        update_actions();
+        update_bookmark_button(url.to_string());
+    };
+
+    m_html_widget->on_link_click = [this](auto& url) {
+        if (url.starts_with("#")) {
+            m_html_widget->scroll_to_anchor(url.substring_view(1, url.length() - 1));
+        } else {
+            m_html_widget->load(m_html_widget->document()->complete_url(url));
+        }
+    };
+
+    m_html_widget->on_title_change = [this](auto& title) {
+        if (title.is_null()) {
+            m_title = m_html_widget->main_frame().document()->url().to_string();
+        } else {
+            m_title = title;
+        }
+        if (on_title_change)
+            on_title_change(m_title);
+    };
+
+    auto focus_location_box_action = GUI::Action::create("Focus location box", { Mod_Ctrl, Key_L }, [this](auto&) {
+        m_location_box->select_all();
+        m_location_box->set_focus(true);
+    });
+
+    m_statusbar = widget.add<GUI::StatusBar>();
+
+    m_html_widget->on_link_hover = [this](auto& href) {
+        m_statusbar->set_text(href);
+    };
+
+    m_bookmarks_bar->on_bookmark_hover = [this](auto&, auto& url) {
+        m_statusbar->set_text(url);
+    };
+
+    Web::ResourceLoader::the().on_load_counter_change = [this] {
+        if (Web::ResourceLoader::the().pending_loads() == 0) {
+            m_statusbar->set_text("");
+            return;
+        }
+        m_statusbar->set_text(String::format("Loading (%d pending resources...)", Web::ResourceLoader::the().pending_loads()));
+    };
+
+    m_menubar = GUI::MenuBar::construct();
+
+    auto& app_menu = m_menubar->add_menu("Browser");
+    app_menu.add_action(GUI::Action::create("Reload", { Mod_None, Key_F5 }, Gfx::Bitmap::load_from_file("/res/icons/16x16/reload.png"), [this](auto&) {
+        TemporaryChange<bool> change(m_should_push_loads_to_history, false);
+        m_html_widget->reload();
+    }));
+    app_menu.add_separator();
+    app_menu.add_action(GUI::CommonActions::make_quit_action([](auto&) {
+        GUI::Application::the().quit();
+    }));
+
+    auto& inspect_menu = m_menubar->add_menu("Inspect");
+    inspect_menu.add_action(GUI::Action::create("View source", { Mod_Ctrl, Key_U }, [this](auto&) {
+        String filename_to_open;
+        char tmp_filename[] = "/tmp/view-source.XXXXXX";
+        ASSERT(m_html_widget->document());
+        if (m_html_widget->document()->url().protocol() == "file") {
+            filename_to_open = m_html_widget->document()->url().path();
+        } else {
+            int fd = mkstemp(tmp_filename);
+            ASSERT(fd >= 0);
+            auto source = m_html_widget->document()->source();
+            write(fd, source.characters(), source.length());
+            close(fd);
+            filename_to_open = tmp_filename;
+        }
+        if (fork() == 0) {
+            execl("/bin/TextEditor", "TextEditor", filename_to_open.characters(), nullptr);
+            ASSERT_NOT_REACHED();
+        }
+    }));
+    inspect_menu.add_action(GUI::Action::create("Inspect DOM tree", { Mod_None, Key_F12 }, [this](auto&) {
+        if (!m_dom_inspector_window) {
+            m_dom_inspector_window = GUI::Window::construct();
+            m_dom_inspector_window->set_rect(100, 100, 300, 500);
+            m_dom_inspector_window->set_title("DOM inspector");
+            m_dom_inspector_window->set_main_widget<InspectorWidget>();
+        }
+        auto* inspector_widget = static_cast<InspectorWidget*>(m_dom_inspector_window->main_widget());
+        inspector_widget->set_document(m_html_widget->document());
+        m_dom_inspector_window->show();
+        m_dom_inspector_window->move_to_front();
+    }));
+
+    auto& debug_menu = m_menubar->add_menu("Debug");
+    debug_menu.add_action(GUI::Action::create("Dump DOM tree", [this](auto&) {
+        Web::dump_tree(*m_html_widget->document());
+    }));
+    debug_menu.add_action(GUI::Action::create("Dump Layout tree", [this](auto&) {
+        Web::dump_tree(*m_html_widget->document()->layout_node());
+    }));
+    debug_menu.add_action(GUI::Action::create("Dump Style sheets", [this](auto&) {
+        for (auto& sheet : m_html_widget->document()->stylesheets()) {
+            dump_sheet(sheet);
+        }
+    }));
+    debug_menu.add_separator();
+    auto line_box_borders_action = GUI::Action::create_checkable("Line box borders", [this](auto& action) {
+        m_html_widget->set_should_show_line_box_borders(action.is_checked());
+        m_html_widget->update();
+    });
+    line_box_borders_action->set_checked(false);
+    debug_menu.add_action(line_box_borders_action);
+
+    auto& bookmarks_menu = m_menubar->add_menu("Bookmarks");
+    auto show_bookmarksbar_action = GUI::Action::create_checkable("Show bookmarks bar", [this](auto& action) {
+        m_bookmarks_bar->set_visible(action.is_checked());
+        m_bookmarks_bar->update();
+    });
+    show_bookmarksbar_action->set_checked(bookmarksbar_enabled);
+    bookmarks_menu.add_action(show_bookmarksbar_action);
+
+    auto& help_menu = m_menubar->add_menu("Help");
+    help_menu.add_action(GUI::Action::create("About", [this](const GUI::Action&) {
+        GUI::AboutDialog::show("Browser", Gfx::Bitmap::load_from_file("/res/icons/32x32/filetype-html.png"), window());
+    }));
+}
+
+Tab::~Tab()
+{
+}
+
+void Tab::load(const URL& url)
+{
+    m_html_widget->load(url);
+}
+
+void Tab::update_actions()
+{
+    m_go_back_action->set_enabled(m_history.can_go_back());
+    m_go_forward_action->set_enabled(m_history.can_go_forward());
+}
+
+void Tab::update_bookmark_button(const String& url)
+{
+    if (m_bookmarks_bar->contains_bookmark(url)) {
+        m_bookmark_button->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/star-yellow.png"));
+    } else {
+        m_bookmark_button->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/star-contour.png"));
+    }
+}
+
+void Tab::did_become_active()
+{
+    GUI::Application::the().set_menubar(m_menubar);
+}
+
+}
diff --git a/Applications/Browser/Tab.h b/Applications/Browser/Tab.h
new file mode 100644
index 0000000000..c596b5afde
--- /dev/null
+++ b/Applications/Browser/Tab.h
@@ -0,0 +1,71 @@
+/*
+ * 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 "History.h"
+#include <AK/URL.h>
+#include <LibGUI/Widget.h>
+#include <LibWeb/Forward.h>
+
+class BookmarksBarWidget;
+
+namespace Browser {
+
+class Tab final : public GUI::Widget {
+    C_OBJECT(Tab);
+
+public:
+    virtual ~Tab() override;
+
+    void load(const URL&);
+
+    void did_become_active();
+
+    Function<void(String)> on_title_change;
+
+    const String& title() const { return m_title; }
+
+private:
+    Tab();
+
+    void update_actions();
+    void update_bookmark_button(const String& url);
+
+    History<URL> m_history;
+    RefPtr<Web::HtmlView> m_html_widget;
+    RefPtr<GUI::Action> m_go_back_action;
+    RefPtr<GUI::Action> m_go_forward_action;
+    RefPtr<GUI::TextBox> m_location_box;
+    RefPtr<BookmarksBarWidget> m_bookmarks_bar;
+    RefPtr<GUI::Button> m_bookmark_button;
+    RefPtr<GUI::Window> m_dom_inspector_window;
+    RefPtr<GUI::StatusBar> m_statusbar;
+    RefPtr<GUI::MenuBar> m_menubar;
+
+    String m_title;
+    bool m_should_push_loads_to_history { true };
+};
+
+}
diff --git a/Applications/Browser/main.cpp b/Applications/Browser/main.cpp
index f46dfca84c..c2ab84b539 100644
--- a/Applications/Browser/main.cpp
+++ b/Applications/Browser/main.cpp
@@ -24,42 +24,19 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "BookmarksBarWidget.h"
-#include "History.h"
 #include "InspectorWidget.h"
+#include "Tab.h"
 #include <LibCore/File.h>
-#include <LibGUI/AboutDialog.h>
-#include <LibGUI/Action.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/BoxLayout.h>
-#include <LibGUI/Button.h>
-#include <LibGUI/Menu.h>
-#include <LibGUI/MenuBar.h>
-#include <LibGUI/StatusBar.h>
-#include <LibGUI/TextBox.h>
-#include <LibGUI/ToolBar.h>
-#include <LibGUI/ToolBarContainer.h>
+#include <LibGUI/TabWidget.h>
 #include <LibGUI/Window.h>
-#include <LibWeb/CSS/StyleResolver.h>
-#include <LibWeb/DOM/Element.h>
-#include <LibWeb/DOMTreeModel.h>
-#include <LibWeb/Dump.h>
-#include <LibWeb/Frame.h>
-#include <LibWeb/HtmlView.h>
-#include <LibWeb/Layout/LayoutBlock.h>
-#include <LibWeb/Layout/LayoutDocument.h>
-#include <LibWeb/Layout/LayoutInline.h>
-#include <LibWeb/Layout/LayoutNode.h>
-#include <LibWeb/Parser/CSSParser.h>
-#include <LibWeb/Parser/HTMLParser.h>
+#include <LibGfx/Bitmap.h>
 #include <LibWeb/ResourceLoader.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 static const char* home_url = "file:///home/anon/www/welcome.html";
-static const char* bookmarks_filename = "/home/anon/bookmarks.json";
-
-static String s_title = "";
 
 int main(int argc, char** argv)
 {
@@ -103,227 +80,40 @@ int main(int argc, char** argv)
     widget.set_layout<GUI::VerticalBoxLayout>();
     widget.layout()->set_spacing(2);
 
-    bool bookmarksbar_enabled = true;
-
-    auto& toolbar_container = widget.add<GUI::ToolBarContainer>();
-    auto& toolbar = toolbar_container.add<GUI::ToolBar>();
-    auto& bookmarksbar = toolbar_container.add<BookmarksBarWidget>(bookmarks_filename, bookmarksbar_enabled);
-    auto& html_widget = widget.add<Web::HtmlView>();
-
-    bookmarksbar.on_bookmark_click = [&](auto&, auto& url) {
-        html_widget.load(url);
-    };
-
-    History<URL> history;
-
-    RefPtr<GUI::Action> go_back_action;
-    RefPtr<GUI::Action> go_forward_action;
+    auto& tab_widget = widget.add<GUI::TabWidget>();
 
-    auto update_actions = [&]() {
-        go_back_action->set_enabled(history.can_go_back());
-        go_forward_action->set_enabled(history.can_go_forward());
+    tab_widget.on_change = [&](auto& active_widget) {
+        auto& tab = static_cast<Browser::Tab&>(active_widget);
+        window->set_title(String::format("%s - Browser", tab.title().characters()));
+        tab.did_become_active();
     };
 
-    bool should_push_loads_to_history = true;
+    auto create_new_tab = [&] {
+        auto& new_tab = tab_widget.add_tab<Browser::Tab>("New tab");
 
-    go_back_action = GUI::CommonActions::make_go_back_action([&](auto&) {
-        history.go_back();
-        update_actions();
-        TemporaryChange<bool> change(should_push_loads_to_history, false);
-        html_widget.load(history.current());
-    });
+        new_tab.on_title_change = [&](auto title) {
+            tab_widget.set_tab_title(new_tab, title);
+            if (tab_widget.active_widget() == &new_tab)
+                window->set_title(String::format("%s - Browser", title.characters()));
+        };
 
-    go_forward_action = GUI::CommonActions::make_go_forward_action([&](auto&) {
-        history.go_forward();
-        update_actions();
-        TemporaryChange<bool> change(should_push_loads_to_history, false);
-        html_widget.load(history.current());
-    });
+        window->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/filetype-html.png"));
 
-    toolbar.add_action(*go_back_action);
-    toolbar.add_action(*go_forward_action);
+        window->set_title("Browser");
+        window->show();
 
-    toolbar.add_action(GUI::CommonActions::make_go_home_action([&](auto&) {
-        html_widget.load(home_url);
-    }));
+        URL url_to_load = home_url;
 
-    toolbar.add_action(GUI::CommonActions::make_reload_action([&](auto&) {
-        TemporaryChange<bool> change(should_push_loads_to_history, false);
-        html_widget.reload();
-    }));
-
-    auto& location_box = toolbar.add<GUI::TextBox>();
-
-    location_box.on_return_pressed = [&] {
-        html_widget.load(location_box.text());
-    };
-
-    auto& bookmark_button = toolbar.add<GUI::Button>();
-    bookmark_button.set_button_style(Gfx::ButtonStyle::CoolBar);
-    bookmark_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/star-black.png"));
-    bookmark_button.set_size_policy(GUI::SizePolicy::Fixed, GUI::SizePolicy::Fixed);
-    bookmark_button.set_preferred_size(22, 22);
-
-    auto update_bookmark_button = [&](const String& url) {
-        if (bookmarksbar.contains_bookmark(url)) {
-            bookmark_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/star-yellow.png"));
-        } else {
-            bookmark_button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/star-contour.png"));
+        if (app.args().size() >= 1) {
+            url_to_load = URL::create_with_url_or_path(app.args()[0]);
         }
-    };
-
-    bookmark_button.on_click = [&] {
-        auto url = html_widget.main_frame().document()->url().to_string();
-        if (bookmarksbar.contains_bookmark(url)) {
-            bookmarksbar.remove_bookmark(url);
-        } else {
-            bookmarksbar.add_bookmark(url, s_title);
-        }
-        update_bookmark_button(url);
-    };
-
-    html_widget.on_load_start = [&](auto& url) {
-        location_box.set_text(url.to_string());
-        if (should_push_loads_to_history)
-            history.push(url);
-        update_actions();
-        update_bookmark_button(url.to_string());
-    };
-
-    html_widget.on_link_click = [&](auto& url) {
-        if (url.starts_with("#")) {
-            html_widget.scroll_to_anchor(url.substring_view(1, url.length() - 1));
-        } else {
-            html_widget.load(html_widget.document()->complete_url(url));
-        }
-    };
-
-    html_widget.on_title_change = [&](auto& title) {
-        if (title.is_null()) {
-            s_title = html_widget.main_frame().document()->url().to_string();
-        } else {
-            s_title = title;
-        }
-        window->set_title(String::format("%s - Browser", s_title.characters()));
-    };
 
-    auto focus_location_box_action = GUI::Action::create("Focus location box", { Mod_Ctrl, Key_L }, [&](auto&) {
-        location_box.select_all();
-        location_box.set_focus(true);
-    });
+        new_tab.load(url_to_load);
 
-    auto& statusbar = widget.add<GUI::StatusBar>();
-
-    html_widget.on_link_hover = [&](auto& href) {
-        statusbar.set_text(href);
-    };
-
-    bookmarksbar.on_bookmark_hover = [&](auto&, auto& url) {
-        statusbar.set_text(url);
-    };
-
-    Web::ResourceLoader::the().on_load_counter_change = [&] {
-        if (Web::ResourceLoader::the().pending_loads() == 0) {
-            statusbar.set_text("");
-            return;
-        }
-        statusbar.set_text(String::format("Loading (%d pending resources...)", Web::ResourceLoader::the().pending_loads()));
+        dbg() << "Added new tab " << &new_tab << ", loading " << url_to_load;
     };
 
-    auto menubar = GUI::MenuBar::construct();
-
-    auto& app_menu = menubar->add_menu("Browser");
-    app_menu.add_action(GUI::Action::create("Reload", { Mod_None, Key_F5 }, Gfx::Bitmap::load_from_file("/res/icons/16x16/reload.png"), [&](auto&) {
-        TemporaryChange<bool> change(should_push_loads_to_history, false);
-        html_widget.reload();
-    }));
-    app_menu.add_separator();
-    app_menu.add_action(GUI::CommonActions::make_quit_action([&](auto&) {
-        app.quit();
-    }));
-
-    RefPtr<GUI::Window> dom_inspector_window;
-
-    auto& inspect_menu = menubar->add_menu("Inspect");
-    inspect_menu.add_action(GUI::Action::create("View source", { Mod_Ctrl, Key_U }, [&](auto&) {
-        String filename_to_open;
-        char tmp_filename[] = "/tmp/view-source.XXXXXX";
-        ASSERT(html_widget.document());
-        if (html_widget.document()->url().protocol() == "file") {
-            filename_to_open = html_widget.document()->url().path();
-        } else {
-            int fd = mkstemp(tmp_filename);
-            ASSERT(fd >= 0);
-            auto source = html_widget.document()->source();
-            write(fd, source.characters(), source.length());
-            close(fd);
-            filename_to_open = tmp_filename;
-        }
-        if (fork() == 0) {
-            execl("/bin/TextEditor", "TextEditor", filename_to_open.characters(), nullptr);
-            ASSERT_NOT_REACHED();
-        }
-    }));
-    inspect_menu.add_action(GUI::Action::create("Inspect DOM tree", { Mod_None, Key_F12 }, [&](auto&) {
-        if (!dom_inspector_window) {
-            dom_inspector_window = GUI::Window::construct();
-            dom_inspector_window->set_rect(100, 100, 300, 500);
-            dom_inspector_window->set_title("DOM inspector");
-            dom_inspector_window->set_main_widget<InspectorWidget>();
-        }
-        auto* inspector_widget = static_cast<InspectorWidget*>(dom_inspector_window->main_widget());
-        inspector_widget->set_document(html_widget.document());
-        dom_inspector_window->show();
-        dom_inspector_window->move_to_front();
-    }));
-
-    auto& debug_menu = menubar->add_menu("Debug");
-    debug_menu.add_action(GUI::Action::create("Dump DOM tree", [&](auto&) {
-        dump_tree(*html_widget.document());
-    }));
-    debug_menu.add_action(GUI::Action::create("Dump Layout tree", [&](auto&) {
-        dump_tree(*html_widget.document()->layout_node());
-    }));
-    debug_menu.add_action(GUI::Action::create("Dump Style sheets", [&](auto&) {
-        for (auto& sheet : html_widget.document()->stylesheets()) {
-            dump_sheet(sheet);
-        }
-    }));
-    debug_menu.add_separator();
-    auto line_box_borders_action = GUI::Action::create_checkable("Line box borders", [&](auto& action) {
-        html_widget.set_should_show_line_box_borders(action.is_checked());
-        html_widget.update();
-    });
-    line_box_borders_action->set_checked(false);
-    debug_menu.add_action(line_box_borders_action);
-
-    auto& bookmarks_menu = menubar->add_menu("Bookmarks");
-    auto show_bookmarksbar_action = GUI::Action::create_checkable("Show bookmarks bar", [&](auto& action) {
-        bookmarksbar.set_visible(action.is_checked());
-        bookmarksbar.update();
-    });
-    show_bookmarksbar_action->set_checked(bookmarksbar_enabled);
-    bookmarks_menu.add_action(show_bookmarksbar_action);
-
-    auto& help_menu = menubar->add_menu("Help");
-    help_menu.add_action(GUI::Action::create("About", [&](const GUI::Action&) {
-        GUI::AboutDialog::show("Browser", Gfx::Bitmap::load_from_file("/res/icons/32x32/filetype-html.png"), window);
-    }));
-
-    app.set_menubar(move(menubar));
-
-    window->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/filetype-html.png"));
-
-    window->set_title("Browser");
-    window->show();
-
-    URL url_to_load = home_url;
-
-    if (app.args().size() >= 1) {
-        url_to_load = URL::create_with_url_or_path(app.args()[0]);
-    }
-
-    html_widget.load(url_to_load);
+    create_new_tab();
 
     return app.exec();
 }