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If you want your own plugin within this source tree
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don't forget to add the new subdirectory to the plugins' Makefile.am
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SUBDIRS list and add your Makefile to the list of Makefiles found at
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about the end of the configure.ac file AC_CONFIG_FILES.
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The API is currently internal until the API is finalized, so you have
9
to build it in this source tree.
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Some more useful notes on developing plugins:
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If you want to display large elements that can be toggled instead of small overlays,
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you can use wm.begin_modal() to make Gala enter modal mode. In this mode, you'll be
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able to receive key events and all mouse events will be delivered regardless of the
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region you have set. Don't forget to call wm.end_modal() and provide an obvious way
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to exit modal mode for the user, otherwise he will be stuck and can only restart
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To add keybindings, you'll need a gsettings schema. You can take a look at Gala's
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schema in data/org.pantheon.desktop.gschema.xml for an example. You'll also find
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how to correctly declare shortcut keys in that file. Once you got this file ready
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it's pretty easy. Just enable its installation in cmake, the relevant is commented
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out in this template, and call wm.get_screen().get_display().add_keybinding().
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The keybinding function takes the name of the shortcut key in your
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schema, then a GSettings instance for that schema, which can be obtained with
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'new GLib.Settings("org.pantheon.gala.plugins.my-plugin")', then some flags, for
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which you can almost always use 0, refer to the vapi for more details, and finally
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your function as arguments. Its delegate is:
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public delegate void KeyHandlerFunc (Meta.Display display, Meta.Screen screen,
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Meta.Window? window, X.Event event, Meta.KeyBinding binding);
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So it'd be something like
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void initialize (Gala.WindowManager wm)
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var display = wm.get_screen ().get_display ();
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var schema = new GLib.Settings ("org.pantheon.desktop.gala.plugins");
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display.add_keybinding ("my-shortcut", schema, 0, my_handler);
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void my_handler (Meta.Display display, Meta.Screen screen, Meta.Window? window,
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X.Event event, Meta.KeyBinding binding)
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print ("Shortcut hit! D:");
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wm.get_screen ().get_display ().remove_keybinding ("my-shortcut");
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Overriding default keybindings
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------------------------------
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Libmutter allows you to override exisiting shortcuts, which is a lot easier than
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adding new ones. All you have to do is:
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Keybinding.set_custom_handler ("shortcut-name", my_handler);
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The signature for my_handler is the same as above.
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A great source for exploring the possibilities of mutter's API is scrolling through
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the mentioned mutter vapi. In some cases you can find documentation on particular
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functions in the mutter source code. Just grep for their C names.
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plugins/template/README
