AK: Add Eternal<T> and use it in various places.

This is useful for static locals that never need to be destroyed:

Thing& Thing::the()
{
    static Eternal<Thing> the;
    return the;
}

The object will be allocated in data segment memory and will never have
its destructor invoked.

LibGUI/GButton.cpp

@@ -26,7 +26,7 @@ void GButton::paint_event(GPaintEvent& event)
     GPainter painter(*this);
     painter.add_clip_rect(event.rect());
 
-    StylePainter::the().paint_button(painter, rect(), m_button_style, m_being_pressed, m_hovered);
+    StylePainter::paint_button(painter, rect(), m_button_style, m_being_pressed, m_hovered);
 
     if (!caption().is_empty() || m_icon) {
         auto content_rect = rect();

LibGUI/GClipboard.cpp

@@ -3,19 +3,7 @@
 #include <WindowServer/WSAPITypes.h>
 #include <LibC/SharedBuffer.h>
 
-GClipboard& GClipboard::the()
-{
-    static GClipboard* s_the;
-    if (!s_the)
-        s_the = new GClipboard;
-    return *s_the;
-}
-
-GClipboard::GClipboard()
-{
-}
-
-String GClipboard::data() const
+String GClipboard::data()
 {
     WSAPI_ClientMessage request;
     request.type = WSAPI_ClientMessage::Type::GetClipboardContents;

LibGUI/GClipboard.h

@@ -4,11 +4,6 @@
 
 class GClipboard {
 public:
-    static GClipboard& the();
-
-    String data() const;
-    void set_data(const String&);
-
-private:
-    GClipboard();
+    static String data();
+    static void set_data(const String&);
 };

LibGUI/GDesktop.cpp

@@ -1,13 +1,12 @@
 #include <LibGUI/GDesktop.h>
 #include <LibGUI/GEventLoop.h>
+#include <AK/Eternal.h>
 #include <string.h>
 
 GDesktop& GDesktop::the()
 {
-    static GDesktop* s_the;
-    if (!s_the)
-        s_the = new GDesktop;
-    return *s_the;
+    static Eternal<GDesktop> the;
+    return the;
 }
 
 GDesktop::GDesktop()

LibGUI/GDesktop.h

@@ -6,12 +6,11 @@
 class GDesktop {
 public:
     static GDesktop& the();
+    GDesktop();
 
     String wallpaper() const;
     bool set_wallpaper(const String& path);
 
 private:
-    GDesktop();
-
     Rect m_rect;
 };

LibGUI/GFontDatabase.cpp

@@ -1,16 +1,14 @@
 #include <LibGUI/GFontDatabase.h>
 #include <SharedGraphics/Font.h>
+#include <AK/Eternal.h>
 #include <dirent.h>
 #include <stdio.h>
 #include <stdlib.h>
 
-static GFontDatabase* s_the;
-
 GFontDatabase& GFontDatabase::the()
 {
-    if (!s_the)
-        s_the = new GFontDatabase;
-    return *s_the;
+    static Eternal<GFontDatabase> the;
+    return the;
 }
 
 GFontDatabase::GFontDatabase()

LibGUI/GFontDatabase.h

@@ -9,13 +9,13 @@ class Font;
 class GFontDatabase {
 public:
     static GFontDatabase& the();
+    GFontDatabase();
 
     RetainPtr<Font> get_by_name(const String&);
     void for_each_font(Function<void(const String&)>);
     void for_each_fixed_width_font(Function<void(const String&)>);
 
 private:
-    GFontDatabase();
     ~GFontDatabase();
 
     struct Metadata {

LibGUI/GScrollBar.cpp

@@ -197,14 +197,14 @@ void GScrollBar::paint_event(GPaintEvent& event)
 
     painter.fill_rect(rect(), Color::from_rgb(0xd6d2ce));
 
-    StylePainter::the().paint_button(painter, up_button_rect(), ButtonStyle::Normal, false);
+    StylePainter::paint_button(painter, up_button_rect(), ButtonStyle::Normal, false);
     painter.draw_bitmap(up_button_rect().location().translated(3, 3), orientation() == Orientation::Vertical ? *s_up_arrow_bitmap : *s_left_arrow_bitmap, has_scrubber() ? Color::Black : Color::MidGray);
 
-    StylePainter::the().paint_button(painter, down_button_rect(), ButtonStyle::Normal, false);
+    StylePainter::paint_button(painter, down_button_rect(), ButtonStyle::Normal, false);
     painter.draw_bitmap(down_button_rect().location().translated(3, 3), orientation() == Orientation::Vertical ? *s_down_arrow_bitmap : *s_right_arrow_bitmap, has_scrubber() ? Color::Black : Color::MidGray);
 
     if (has_scrubber())
-        StylePainter::the().paint_button(painter, scrubber_rect(), ButtonStyle::Normal, false);
+        StylePainter::paint_button(painter, scrubber_rect(), ButtonStyle::Normal, false);
 }
 
 void GScrollBar::mousedown_event(GMouseEvent& event)

LibGUI/GStatusBar.cpp

@@ -37,5 +37,5 @@ void GStatusBar::paint_event(GPaintEvent& event)
 {
     GPainter painter(*this);
     painter.add_clip_rect(event.rect());
-    StylePainter::the().paint_surface(painter, rect(), !spans_entire_window_horizontally());
+    StylePainter::paint_surface(painter, rect(), !spans_entire_window_horizontally());
 }

LibGUI/GTextEditor.cpp

@@ -785,7 +785,7 @@ void GTextEditor::cut()
 {
     auto selected_text = this->selected_text();
     printf("Cut: \"%s\"\n", selected_text.characters());
-    GClipboard::the().set_data(selected_text);
+    GClipboard::set_data(selected_text);
     delete_selection();
 }
 
@@ -793,12 +793,12 @@ void GTextEditor::copy()
 {
     auto selected_text = this->selected_text();
     printf("Copy: \"%s\"\n", selected_text.characters());
-    GClipboard::the().set_data(selected_text);
+    GClipboard::set_data(selected_text);
 }
 
 void GTextEditor::paste()
 {
-    auto paste_text = GClipboard::the().data();
+    auto paste_text = GClipboard::data();
     printf("Paste: \"%s\"\n", paste_text.characters());
     insert_at_cursor_or_replace_selection(paste_text);
 }

LibGUI/GToolBar.cpp

@@ -79,5 +79,5 @@ void GToolBar::paint_event(GPaintEvent& event)
 {
     GPainter painter(*this);
     painter.add_clip_rect(event.rect());
-    StylePainter::the().paint_surface(painter, rect(), !spans_entire_window_horizontally());
+    StylePainter::paint_surface(painter, rect(), !spans_entire_window_horizontally());
 }