LibGUI: Add GIcon::default_icon(name).

This is a convenience helper to instantiate a GIcon like so:

    auto icon = GIcon::default_icon("filetype-image");

This will give you the "filetype-image" icon in both 16x16 and 32x32 sizes.

Applications/FileManager/DirectoryModel.cpp

@@ -57,12 +57,12 @@ DirectoryModel::DirectoryModel()
 {
     create_thread(thumbnail_thread, this);
 
-    m_directory_icon = GIcon(GraphicsBitmap::load_from_file("/res/icons/folder16.png"), GraphicsBitmap::load_from_file("/res/icons/32x32/folder.png"));
-    m_file_icon = GIcon(GraphicsBitmap::load_from_file("/res/icons/file16.png"), GraphicsBitmap::load_from_file("/res/icons/32x32/file.png"));
-    m_symlink_icon = GIcon(GraphicsBitmap::load_from_file("/res/icons/link16.png"));
-    m_socket_icon = GIcon(GraphicsBitmap::load_from_file("/res/icons/socket16.png"));
-    m_executable_icon = GIcon(GraphicsBitmap::load_from_file("/res/icons/executable16.png"), GraphicsBitmap::load_from_file("/res/icons/32x32/filetype-executable.png"));
-    m_filetype_image_icon = GIcon(GraphicsBitmap::load_from_file("/res/icons/16x16/filetype-image.png"), GraphicsBitmap::load_from_file("/res/icons/32x32/filetype-image.png"));
+    m_directory_icon = GIcon::default_icon("filetype-folder");
+    m_file_icon = GIcon::default_icon("filetype-unknown");
+    m_symlink_icon = GIcon::default_icon("filetype-symlink");
+    m_socket_icon = GIcon::default_icon("filetype-socket");
+    m_executable_icon = GIcon::default_icon("filetype-executable");
+    m_filetype_image_icon = GIcon::default_icon("filetype-image");
 
     setpwent();
     while (auto* passwd = getpwent())

Applications/Launcher/main.cpp

@@ -71,7 +71,7 @@ GWindow* make_launcher_window()
 
     new LauncherButton("/res/icons/Terminal.png", "/bin/Terminal", widget);
     new LauncherButton("/res/icons/FontEditor.png", "/bin/FontEditor", widget);
-    new LauncherButton("/res/icons/folder32.png", "/bin/FileManager", widget);
+    new LauncherButton("/res/icons/32x32/filetype-folder.png", "/bin/FileManager", widget);
     new LauncherButton("/res/icons/TextEditor.png", "/bin/TextEditor", widget);
 
     return window;

LibGUI/GIcon.cpp

@@ -61,3 +61,10 @@ void GIconImpl::set_bitmap_for_size(int size, RetainPtr<GraphicsBitmap>&& bitmap
     }
     m_bitmaps.set(size, move(bitmap));
 }
+
+GIcon GIcon::default_icon(const String& name)
+{
+    auto bitmap16 = GraphicsBitmap::load_from_file(String::format("/res/icons/16x16/%s.png", name.characters()));
+    auto bitmap32 = GraphicsBitmap::load_from_file(String::format("/res/icons/32x32/%s.png", name.characters()));
+    return GIcon(move(bitmap16), move(bitmap32));
+}

LibGUI/GIcon.h

@@ -25,6 +25,8 @@ public:
     GIcon(const GIcon&);
     ~GIcon() { }
 
+    static GIcon default_icon(const String&);
+
     GIcon& operator=(const GIcon& other)
     {
         m_impl = other.m_impl.copy_ref();