Support GTK3+ about xournalpp HOT 5 CLOSED

This was accidentally closed. The deprecated calls are mostly:

g_mutex_new();
g_mutex_free(GMutex*);
g_cond_new();
g_cond_free(GCond*);
gdk_pixbuf_unref(GdkPixBuf*);
g_thread_init(gpointer);

from xournalpp.

I think eventually gdk_threads_enter() and gdk_threads_leave() will be deprecated. Therefore I think this enhancement should be labelled "support gtk3+". Not in this milestone but hopefully in the next year :)

from xournalpp.

This has been partially updated through the pull request of x2b. I've put the most cutting edge work in the branch gtk3 - please use that branch if you're going to work on gtk3+ support!

from xournalpp.

I've done some more research into what needs to be done. This list is incomplete and may be updated as we go, but:

• Change gtk+-2.0 to gtk+-3.0 in configure.ac
• Figure out how to get rid of the <gdk/gdktypes.h> header (GTK3 only supports a few headers)
• Migrate from libglade-2.0 to GTKBuilder (libglade3 does not seem to be supported by e.g. Ubuntu 13.10, but it can be used to convert .glade files to GTKBuilder files, the recommended step)
• Change GDK_* keys to GDK_KEY_* (e.g. GDK_Home needs to be updated)
• gdk_drawable has been retired: src/util/Util.cpp: gdk_drawable_set_colormap(GDK_DRAWABLE (pixmap), will need to be updated to a gdk_window call, I think. See https://developer.gnome.org/gtk3/stable/ch24s02.html#id-1.6.3.4.6.

Since this won't be backwards compatible and likely won't compile for a while, I've created a branch gtk3. Please use this branch if you want to experiment!

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Master is now at GTK3

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