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gtk2/docs/developers.txt

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docs: Drop the '+' from GTK We need to adapt to both the change in the name of the project, and to the name change in the pkg-config file.
2019-02-05 09:14:31 +00:00
Things to care about when using/programing for GTK
==================================================
backed out the section "Gnits to care about". new file, kinda developers Wed Feb 11 00:18:31 1998 Tim Janik <timj@gimp.org> * docs/refcounting.txt: backed out the section "Gnits to care about". * docs/developers.txt: new file, kinda developers FAQ.
1998-02-11 00:40:20 +00:00
This file is meant to collect some frequently triggered failures when
programming for/with Gtk, having the spirit of a developers FAQ.
It is also the correct place to list up things that programmers should
care about in general.
Apply a cleanup patch by Kjartan Maraas (#341812) 2006-10-08 Matthias Clasen <mclasen@redhat.com> * Apply a cleanup patch by Kjartan Maraas (#341812)
2006-10-08 05:07:55 +00:00
In the hope that this text might be useful to someone,
backed out the section "Gnits to care about". new file, kinda developers Wed Feb 11 00:18:31 1998 Tim Janik <timj@gimp.org> * docs/refcounting.txt: backed out the section "Gnits to care about". * docs/developers.txt: new file, kinda developers FAQ.
1998-02-11 00:40:20 +00:00
- Tim Janik <timj@gimp.org>
1998/02/11
Automatic destruction of widgets on removal from parent
-------------------------------------------------------
This is a reference counting issue, you would want to refer
to refcounting.txt on it.
What are all the widget flags about?
------------------------------------
Refer to the file widget_system.txt which covers widget flags and the
resulting invariants in a detailed way.
GdkWindow -> GdkSurface initial type rename This renames the GdkWindow class and related classes (impl, backend subclasses) to surface. Additionally it renames related types: GdkWindowAttr, GdkWindowPaint, GdkWindowWindowClass, GdkWindowType, GdkWindowTypeHint, GdkWindowHints, GdkWindowState, GdkWindowEdge This is an automatic conversion using the below commands: git sed -f g GdkWindowWindowClass GdkSurfaceSurfaceClass git sed -f g GdkWindow GdkSurface git sed -f g "gdk_window\([ _\(\),;]\|$\)" "gdk_surface\1" # Avoid hitting gdk_windowing git sed -f g "GDK_WINDOW\([ _\(]\|$\)" "GDK_SURFACE\1" # Avoid hitting GDK_WINDOWING git sed "GDK_\([A-Z]*\)IS_WINDOW\([_ (]\|$\)" "GDK_\1IS_SURFACE\2" git sed GDK_TYPE_WINDOW GDK_TYPE_SURFACE git sed -f g GdkPointerWindowInfo GdkPointerSurfaceInfo git sed -f g "BROADWAY_WINDOW" "BROADWAY_SURFACE" git sed -f g "broadway_window" "broadway_surface" git sed -f g "BroadwayWindow" "BroadwaySurface" git sed -f g "WAYLAND_WINDOW" "WAYLAND_SURFACE" git sed -f g "wayland_window" "wayland_surface" git sed -f g "WaylandWindow" "WaylandSurface" git sed -f g "X11_WINDOW" "X11_SURFACE" git sed -f g "x11_window" "x11_surface" git sed -f g "X11Window" "X11Surface" git sed -f g "WIN32_WINDOW" "WIN32_SURFACE" git sed -f g "win32_window" "win32_surface" git sed -f g "Win32Window" "Win32Surface" git sed -f g "QUARTZ_WINDOW" "QUARTZ_SURFACE" git sed -f g "quartz_window" "quartz_surface" git sed -f g "QuartzWindow" "QuartzSurface" git checkout NEWS* po-properties
2018-03-20 10:40:08 +00:00
GdkSurface pointers may be NULL in GdkEvents
backed out the section "Gnits to care about". new file, kinda developers Wed Feb 11 00:18:31 1998 Tim Janik <timj@gimp.org> * docs/refcounting.txt: backed out the section "Gnits to care about". * docs/developers.txt: new file, kinda developers FAQ.
1998-02-11 00:40:20 +00:00
-------------------------------------------
The notification nature of the signal mechanism might cause events to
GdkWindow -> GdkSurface initial type rename This renames the GdkWindow class and related classes (impl, backend subclasses) to surface. Additionally it renames related types: GdkWindowAttr, GdkWindowPaint, GdkWindowWindowClass, GdkWindowType, GdkWindowTypeHint, GdkWindowHints, GdkWindowState, GdkWindowEdge This is an automatic conversion using the below commands: git sed -f g GdkWindowWindowClass GdkSurfaceSurfaceClass git sed -f g GdkWindow GdkSurface git sed -f g "gdk_window\([ _\(\),;]\|$\)" "gdk_surface\1" # Avoid hitting gdk_windowing git sed -f g "GDK_WINDOW\([ _\(]\|$\)" "GDK_SURFACE\1" # Avoid hitting GDK_WINDOWING git sed "GDK_\([A-Z]*\)IS_WINDOW\([_ (]\|$\)" "GDK_\1IS_SURFACE\2" git sed GDK_TYPE_WINDOW GDK_TYPE_SURFACE git sed -f g GdkPointerWindowInfo GdkPointerSurfaceInfo git sed -f g "BROADWAY_WINDOW" "BROADWAY_SURFACE" git sed -f g "broadway_window" "broadway_surface" git sed -f g "BroadwayWindow" "BroadwaySurface" git sed -f g "WAYLAND_WINDOW" "WAYLAND_SURFACE" git sed -f g "wayland_window" "wayland_surface" git sed -f g "WaylandWindow" "WaylandSurface" git sed -f g "X11_WINDOW" "X11_SURFACE" git sed -f g "x11_window" "x11_surface" git sed -f g "X11Window" "X11Surface" git sed -f g "WIN32_WINDOW" "WIN32_SURFACE" git sed -f g "win32_window" "win32_surface" git sed -f g "Win32Window" "Win32Surface" git sed -f g "QUARTZ_WINDOW" "QUARTZ_SURFACE" git sed -f g "quartz_window" "quartz_surface" git sed -f g "QuartzWindow" "QuartzSurface" git checkout NEWS* po-properties
2018-03-20 10:40:08 +00:00
be emitted that have their GdkSurface pointer set to NULL.
backed out the section "Gnits to care about". new file, kinda developers Wed Feb 11 00:18:31 1998 Tim Janik <timj@gimp.org> * docs/refcounting.txt: backed out the section "Gnits to care about". * docs/developers.txt: new file, kinda developers FAQ.
1998-02-11 00:40:20 +00:00
This is due to the fact that certain events need to be emitted after the
GdkWindow -> GdkSurface initial type rename This renames the GdkWindow class and related classes (impl, backend subclasses) to surface. Additionally it renames related types: GdkWindowAttr, GdkWindowPaint, GdkWindowWindowClass, GdkWindowType, GdkWindowTypeHint, GdkWindowHints, GdkWindowState, GdkWindowEdge This is an automatic conversion using the below commands: git sed -f g GdkWindowWindowClass GdkSurfaceSurfaceClass git sed -f g GdkWindow GdkSurface git sed -f g "gdk_window\([ _\(\),;]\|$\)" "gdk_surface\1" # Avoid hitting gdk_windowing git sed -f g "GDK_WINDOW\([ _\(]\|$\)" "GDK_SURFACE\1" # Avoid hitting GDK_WINDOWING git sed "GDK_\([A-Z]*\)IS_WINDOW\([_ (]\|$\)" "GDK_\1IS_SURFACE\2" git sed GDK_TYPE_WINDOW GDK_TYPE_SURFACE git sed -f g GdkPointerWindowInfo GdkPointerSurfaceInfo git sed -f g "BROADWAY_WINDOW" "BROADWAY_SURFACE" git sed -f g "broadway_window" "broadway_surface" git sed -f g "BroadwayWindow" "BroadwaySurface" git sed -f g "WAYLAND_WINDOW" "WAYLAND_SURFACE" git sed -f g "wayland_window" "wayland_surface" git sed -f g "WaylandWindow" "WaylandSurface" git sed -f g "X11_WINDOW" "X11_SURFACE" git sed -f g "x11_window" "x11_surface" git sed -f g "X11Window" "X11Surface" git sed -f g "WIN32_WINDOW" "WIN32_SURFACE" git sed -f g "win32_window" "win32_surface" git sed -f g "Win32Window" "Win32Surface" git sed -f g "QUARTZ_WINDOW" "QUARTZ_SURFACE" git sed -f g "quartz_window" "quartz_surface" git sed -f g "QuartzWindow" "QuartzSurface" git checkout NEWS* po-properties
2018-03-20 10:40:08 +00:00
real GdkSurface of a widget is not any longer pertinent.
backed out the section "Gnits to care about". new file, kinda developers Wed Feb 11 00:18:31 1998 Tim Janik <timj@gimp.org> * docs/refcounting.txt: backed out the section "Gnits to care about". * docs/developers.txt: new file, kinda developers FAQ.
1998-02-11 00:40:20 +00:00
It's up to the signal handling function (application) to check for the
window field of the event structure to be != NULL, if it is going to
perform any operations through Gdk calls on it.
Events that a likely to trigger a missing check for the window pointer
currently are (and correspond to the trailing signals):
GDK_SELECTION_CLEAR GtkWidget::selection_clear_event
GDK_FOCUS_CHANGE GtkWidget::focus_in_event
GtkWidget::focus_out_event
Convert all references to GdkEvent->surface
2018-03-20 15:25:50 +00:00
Events that are assured to have a valid GdkEvent.any.surface field are
backed out the section "Gnits to care about". new file, kinda developers Wed Feb 11 00:18:31 1998 Tim Janik <timj@gimp.org> * docs/refcounting.txt: backed out the section "Gnits to care about". * docs/developers.txt: new file, kinda developers FAQ.
1998-02-11 00:40:20 +00:00
GDK_EXPOSE GtkWidget::expose_event
Writing Gdk functions
---------------------
GdkWindow -> GdkSurface initial type rename This renames the GdkWindow class and related classes (impl, backend subclasses) to surface. Additionally it renames related types: GdkWindowAttr, GdkWindowPaint, GdkWindowWindowClass, GdkWindowType, GdkWindowTypeHint, GdkWindowHints, GdkWindowState, GdkWindowEdge This is an automatic conversion using the below commands: git sed -f g GdkWindowWindowClass GdkSurfaceSurfaceClass git sed -f g GdkWindow GdkSurface git sed -f g "gdk_window\([ _\(\),;]\|$\)" "gdk_surface\1" # Avoid hitting gdk_windowing git sed -f g "GDK_WINDOW\([ _\(]\|$\)" "GDK_SURFACE\1" # Avoid hitting GDK_WINDOWING git sed "GDK_\([A-Z]*\)IS_WINDOW\([_ (]\|$\)" "GDK_\1IS_SURFACE\2" git sed GDK_TYPE_WINDOW GDK_TYPE_SURFACE git sed -f g GdkPointerWindowInfo GdkPointerSurfaceInfo git sed -f g "BROADWAY_WINDOW" "BROADWAY_SURFACE" git sed -f g "broadway_window" "broadway_surface" git sed -f g "BroadwayWindow" "BroadwaySurface" git sed -f g "WAYLAND_WINDOW" "WAYLAND_SURFACE" git sed -f g "wayland_window" "wayland_surface" git sed -f g "WaylandWindow" "WaylandSurface" git sed -f g "X11_WINDOW" "X11_SURFACE" git sed -f g "x11_window" "x11_surface" git sed -f g "X11Window" "X11Surface" git sed -f g "WIN32_WINDOW" "WIN32_SURFACE" git sed -f g "win32_window" "win32_surface" git sed -f g "Win32Window" "Win32Surface" git sed -f g "QUARTZ_WINDOW" "QUARTZ_SURFACE" git sed -f g "quartz_window" "quartz_surface" git sed -f g "QuartzWindow" "QuartzSurface" git checkout NEWS* po-properties
2018-03-20 10:40:08 +00:00
When writing Gdk functions that operate on GdkSurface structures in any
meaningful sense, that is casting to a GdkSurfacePrivate structure for
access to fields other then GdkSurface.user_data, the programmer is
recommended to check for the GdkSurfacePrivate.destroyed field to be ==
FALSE, especially if the GdkSurfacePrivate.xwindow field is used.
backed out the section "Gnits to care about". new file, kinda developers Wed Feb 11 00:18:31 1998 Tim Janik <timj@gimp.org> * docs/refcounting.txt: backed out the section "Gnits to care about". * docs/developers.txt: new file, kinda developers FAQ.
1998-02-11 00:40:20 +00:00
Silent abortion of the Gdk function is the correct behaviour if this
condition isn't met.
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