GTK+ 4 Migration

A page to track the migration to Gtk4.

See: https://docs.gtk.org/gtk4/migrating-3to4.html

Preparation:

• ☑ Do not use GTK-specific command line arguments
• ☐ Do not use widget style properties
• ☐ Review your window creation flags (3x src/ui/widget/color-slider.cpp)
• ☐ Stop using direct access to GdkEvent structs (note: can use GtkEvent structures)
• ☑ Stop using gdk_pointer_warp()
• ☑ Stop using non-RGBA visuals
• ☑ gtk_widget_set_app_paintable
• ☐ Stop using GtkBox padding, fill and expand child properties
• ☐ Stop using the state argument of GtkStyleContext getters (deprecated in 4.10, gtk_style_context_get_property removed, ui/widget/ink-ruler.cpp)
• ☑ Stop using gdk_pixbuf_get_from_window() and gdk_cairo_set_source_window()
• ☐ Stop using GtkButton's image-related API
• ☐ Stop using GtkWidget event signals (Convert to Controllers, BIG)
• ☑ Set a proper application ID
• ☐ Stop using gtk_main() and related APIs (2geom tests, autotrace, script)
• ☑ Reduce the use of gtk_widget_destroy() (Only used for message dialogs and for ComboBoxEnryToolItem which will disappear.)
• ☑ Stop using the GtkWidget.destroy vfunc (Not used)
• ☐ Reduce the use of generic container APIs
• ☑ Review your use of icon resources

At time of switch:

Some of these we maybe able to do earlier.

• ☐ Subclassing widgets
• ☐ Life-cycle handling
• ☐ Stop using GdkScreen
• ☐ Stop using the root window
• ☐ Stop using GdkVisual
• ☐ Stop using GdkDeviceManager
• ☐ Adapt to GdkWindow API changes
• ☐ The "iconified" window state has been renamed to "minimized"
• ☐ Adapt to GdkEvent API changes
• ☐ Stop using grabs
• ☐ Adapt to coordinate API changes
• ☐ Adapt to GdkKeymap API changes
• ☐ Adapt to changes in keyboard modifier handling
• ☐ Replace GtkClipboard with GdkClipboard
• ☐ Stop using gtk_get_current_... APIs
• ☐ Convert your UI files
• ☐ Adapt to GtkBuilder API changes
• ☐ Adapt to event controller API changes
• ☐ Focus handling changes
• ☐ Use the new apis for keyboard shortcuts
• ☐ Stop using GtkEventBox
• ☐ Stop using GtkButtonBox
• ☐ Adapt to GtkBox API changes
• ☐ Adapt to GtkWindow API changes
• ☐ Adapt to GtkHeaderBar and GtkActionBar API changes
• ☐ Adapt to GtkStack, GtkAssistant and GtkNotebook API changes
• ☐ Adapt to button class hierarchy changes
• ☐ Adapt to GtkScrolledWindow API changes
• ☐ Adapt to GtkBin removal
• ☐ Adapt to GtkContainer removal
• ☐ Stop using GtkContainer::border-width
• ☐ Adapt to coordinate API changes
• ☐ Adapt to GtkStyleContext API changes
• ☐ Adapt to GtkCssProvider API changes
• ☐ Stop using GtkShadowType and GtkRelief properties
• ☐ Adapt to GtkWidget's size request changes
• ☐ Adapt to GtkWidget's size allocation changes
• ☐ Switch to GtkWidget's children APIs
• ☐ Don't use -gtk-gradient in your CSS
• ☐ Don't use -gtk-icon-effect in your CSS
• ☐ Don't use -gtk-icon-theme in your CSS
• ☐ Don't use -gtk-outline-...-radius in your CSS
• ☐ Adapt to drawing model changes
• ☐ Stop using APIs to query GdkSurfaces
• ☐ Widgets are now visible by default
• ☐ Adapt to changes in animated hiding and showing of widgets
• ☐ Stop passing commandline arguments to gtk_init
• ☐ GdkPixbuf is deemphasized
• ☐ GtkWidget event signals are removed
• ☐ Invalidation handling has changed
• ☐ Stop using GtkWidget::draw
• ☐ Window content observation has changed
• ☐ Monitor handling has changed
• ☐ Adapt to monitor API changes
• ☐ Adapt to cursor API changes
• ☐ Adapt to icon size API changes
• ☐ Adapt to changes in the GtkAssistant API
• ☐ Adapt to changes in the API of GtkEntry, GtkSearchEntry and GtkSpinButton
• ☐ Adapt to changes in GtkOverlay
• ☐ Use GtkFixed instead of GtkLayout
• ☐ Adapt to search entry changes
• ☐ Adapt to GtkScale changes
• ☐ Stop using gtk_window_activate_default()
• ☐ Stop using gtk_widget_grab_default()
• ☐ Stop setting ::has-default and ::has-focus in .ui files
• ☐ Stop using the GtkWidget::display-changed signal
• ☐ GtkPopover::modal has been renamed to autohide
• ☐ gtk_widget_get_surface has been removed
• ☐ gtk_widget_is_toplevel has been removed
• ☐ gtk_widget_get_toplevel has been removed
• ☐ GtkEntryBuffer ::deleted-text has changed
• ☐ GtkMenu, GtkMenuBar and GtkMenuItem are gone
• ☐ GtkToolbar has been removed
• ☐ GtkAspectFrame is no longer a frame
• ☐ Stop using custom tooltip windows
• ☐ Switch to the new Drag-and-Drop api
• ☐ Adapt to GtkIconTheme API changes
• ☐ Adapt to GtkImage changes
• ☐ Update to GtkFileChooser API changes
• ☐ Stop using blocking dialog functions
• ☐ Stop using GtkBuildable API
• ☐ Adapt to GtkAboutDialog API changes
• ☐ Adapt to GtkTreeView and GtkIconView tooltip context changes
• ☐ Adapt to GtkPopover changes
• ☐ Stop using GtkFileChooserButton
• ☐ Adapt to changed GtkSettings properties

After switch:

• ☐ Use new list widgets.