=begin pod =TITLE Migrating from GTK 3 to GTK 4 The main L suggests three stages, changing the GTK3 code to make migration easier, then changing, then steps after the migration. Steps before Migration [_] Verified not to exist in GTK::Simple [X] GTL::Simple ammended [?] GTK::Simple has problems, or not known for certain =item [X] Do not use deprecated symbols =item [_] Enable diagnostic warnings =item [_] Do not use GTK-specific command line arguments =item [_] Do not use widget style properties =item [_] Review your window creation flags =item [?] Stop using direct access to GdkEvent structs Seems to be OK =item [_] Stop using gdk_pointer_warp() =item [_] Stop using non-RGBA visuals =item [?] Stop using GtkBox padding, fill and expand child properties =item [_] Stop using the state argument of GtkStyleContext getters =item [?] Stop using gdk_pixbuf_get_from_window() and gdk_cairo_set_source_surface() =item [?] Stop using GtkWidget event signals =item [?] Set a proper application ID =item [?] Stop using gtk_main() and related APIs =item [?] Reduce the use of gtk_widget_destroy() =item [?] Reduce the use of generic container APIs =item [?] Review your use of icon resources =head2 Remove deprecated widgets =item GtkSymbolicColor | Symbolic colors =item2 GtkGradient | Gradients =item2 Resource Files | Deprecated routines for handling resource files =item GtkStyle | Deprecated object that holds style information for widgets =item GtkHScale | A horizontal slider widget for selecting a value from a range =item GtkVScale | A vertical slider widget for selecting a value from a range =item GtkTearoffMenuItem | A menu item used to tear off and reattach its menu =item GtkColorSelection | Deprecated widget used to select a color =item GtkColorSelectionDialog | Deprecated dialog box for selecting a color =item GtkHSV | A “color wheel” widget =item GtkFontSelection | Deprecated widget for selecting fonts =item GtkFontSelectionDialog | Deprecated dialog box for selecting fonts =item GtkHBox | A horizontal container box =item GtkVBox | A vertical container box =item GtkHButtonBox | A container for arranging buttons horizontally =item GtkVButtonBox | A container for arranging buttons vertically =item GtkHPaned | A container with two panes arranged horizontally =item GtkVPaned | A container with two panes arranged vertically =item GtkTable | Pack widgets in regular patterns =item GtkHSeparator | A horizontal separator =item GtkVSeparator | A vertical separator =item GtkHScrollbar | A horizontal scrollbar =item GtkVScrollbar | A vertical scrollbar =item GtkUIManager | Constructing menus and toolbars from an XML description =item GtkActionGroup | A group of actions =item GtkAction | A deprecated action which can be triggered by a menu or toolbar item =item GtkToggleAction | An action which can be toggled between two states =item GtkRadioAction | An action of which only one in a group can be active =item GtkRecentAction | An action of which represents a list of recently used files =item GtkActivatable | An interface for activatable widgets =item GtkImageMenuItem | A deprecated widget for a menu item with an icon =item GtkMisc | Base class for widgets with alignments and padding =item Stock Items | Prebuilt common menu/toolbar items and corresponding icons =item Themeable Stock Images | Manipulating stock icons =item GtkNumerableIcon | A GIcon that allows numbered emblems =item GtkArrow | Displays an arrow =item GtkStatusIcon | Display an icon in the system tray =item GtkThemingEngine | Theming renderers =item GtkAlignment | A widget which controls the alignment and size of its child =end pod