Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibGUI/GApplication.cpp

@@ -0,0 +1,113 @@
+#include <LibGUI/GAction.h>
+#include <LibGUI/GApplication.h>
+#include <LibGUI/GEventLoop.h>
+#include <LibGUI/GLabel.h>
+#include <LibGUI/GMenuBar.h>
+#include <LibGUI/GPainter.h>
+#include <LibGUI/GWindow.h>
+#include <WindowServer/WSAPITypes.h>
+
+static GApplication* s_the;
+
+GApplication& GApplication::the()
+{
+    ASSERT(s_the);
+    return *s_the;
+}
+
+GApplication::GApplication(int argc, char** argv)
+{
+    (void)argc;
+    (void)argv;
+    ASSERT(!s_the);
+    s_the = this;
+    m_event_loop = make<GEventLoop>();
+}
+
+GApplication::~GApplication()
+{
+    s_the = nullptr;
+}
+
+int GApplication::exec()
+{
+    int exit_code = m_event_loop->exec();
+    // NOTE: Maybe it would be cool to return instead of exit()?
+    //       This would require cleaning up all the CObjects on the heap.
+    exit(exit_code);
+    return exit_code;
+}
+
+void GApplication::quit(int exit_code)
+{
+    m_event_loop->quit(exit_code);
+}
+
+void GApplication::set_menubar(OwnPtr<GMenuBar>&& menubar)
+{
+    if (m_menubar)
+        m_menubar->notify_removed_from_application({});
+    m_menubar = move(menubar);
+    if (m_menubar)
+        m_menubar->notify_added_to_application({});
+}
+
+void GApplication::register_global_shortcut_action(Badge<GAction>, GAction& action)
+{
+    m_global_shortcut_actions.set(action.shortcut(), &action);
+}
+
+void GApplication::unregister_global_shortcut_action(Badge<GAction>, GAction& action)
+{
+    m_global_shortcut_actions.remove(action.shortcut());
+}
+
+GAction* GApplication::action_for_key_event(const GKeyEvent& event)
+{
+    auto it = m_global_shortcut_actions.find(GShortcut(event.modifiers(), (KeyCode)event.key()));
+    if (it == m_global_shortcut_actions.end())
+        return nullptr;
+    return (*it).value;
+}
+
+class GApplication::TooltipWindow final : public GWindow {
+public:
+    TooltipWindow()
+    {
+        set_window_type(GWindowType::Tooltip);
+        m_label = new GLabel;
+        m_label->set_background_color(Color::from_rgb(0xdac7b5));
+        m_label->set_fill_with_background_color(true);
+        m_label->set_frame_thickness(1);
+        m_label->set_frame_shape(FrameShape::Container);
+        m_label->set_frame_shadow(FrameShadow::Plain);
+        set_main_widget(m_label);
+    }
+
+    void set_tooltip(const StringView& tooltip)
+    {
+        // FIXME: Add some kind of GLabel auto-sizing feature.
+        int text_width = m_label->font().width(tooltip);
+        set_rect(100, 100, text_width + 10, m_label->font().glyph_height() + 8);
+        m_label->set_text(tooltip);
+    }
+
+    GLabel* m_label { nullptr };
+};
+
+void GApplication::show_tooltip(const StringView& tooltip, const Point& screen_location)
+{
+    if (!m_tooltip_window) {
+        m_tooltip_window = new TooltipWindow;
+        m_tooltip_window->set_double_buffering_enabled(false);
+    }
+    m_tooltip_window->set_tooltip(tooltip);
+    m_tooltip_window->move_to(screen_location);
+    m_tooltip_window->show();
+}
+
+void GApplication::hide_tooltip()
+{
+    if (m_tooltip_window)
+        m_tooltip_window->hide();
+}