wlt: toggle fullscreen on F11

This adds a --grab-fullscreen parameter which configures the key that
toggles fullscreen. This is handled in the theme widget as we consider it
the main window-handler.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

src/wlt_main.c

@@ -234,6 +234,9 @@ static void print_help()
 		"\t                                Shortcut to scroll page up\n"
 		"\t    --grab-page-down <grab>   [<Shift>Next]\n"
 		"\t                                Shortcut to scroll page down\n"
+		"\t    --grab-fullscreen <grab>  [F11]\n"
+		"\t                                Shortcut to toggle fullscreen mode\n"
+		"\n"
 		"Font Options:\n"
 		"\t    --font-engine <engine>  [pango]\n"
 		"\t                              Font engine\n"
@@ -321,6 +324,11 @@ static struct conf_grab def_grab_page_down = {
 	.keysym = XKB_KEY_Next,
 };
 
+static struct conf_grab def_grab_fullscreen = {
+	.mods = 0,
+	.keysym = XKB_KEY_F11,
+};
+
 struct conf_option options[] = {
 	CONF_OPTION_BOOL('h', "help", aftercheck_help, &wlt_conf.help, false),
 	CONF_OPTION_BOOL('v', "verbose", NULL, &wlt_conf.verbose, false),
@@ -336,6 +344,7 @@ struct conf_option options[] = {
 	CONF_OPTION_GRAB(0, "grab-scroll-down", NULL, &wlt_conf.grab_scroll_down, &def_grab_scroll_down),
 	CONF_OPTION_GRAB(0, "grab-page-up", NULL, &wlt_conf.grab_page_up, &def_grab_page_up),
 	CONF_OPTION_GRAB(0, "grab-page-down", NULL, &wlt_conf.grab_page_down, &def_grab_page_down),
+	CONF_OPTION_GRAB(0, "grab-fullscreen", NULL, &wlt_conf.grab_fullscreen, &def_grab_fullscreen),
 
 	CONF_OPTION_STRING(0, "font-engine", NULL, &wlt_conf.font_engine, "pango"),
 	CONF_OPTION_UINT(0, "font-size", NULL, &wlt_conf.font_size, 12),

src/wlt_main.h

@@ -65,6 +65,8 @@ struct wlt_conf_t {
 	struct conf_grab *grab_page_up;
 	/* page-down grab */
 	struct conf_grab *grab_page_down;
+	/* fullscreen grab */
+	struct conf_grab *grab_fullscreen;
 
 	/* font engine */
 	char *font_engine;

src/wlt_theme.c

@@ -33,6 +33,8 @@
 #include <string.h>
 #include <wayland-client.h>
 #include "log.h"
+#include "shl_misc.h"
+#include "wlt_main.h"
 #include "wlt_theme.h"
 #include "wlt_toolkit.h"
 
@@ -519,6 +521,24 @@ static void widget_pointer_button(struct wlt_widget *widget,
 	}
 }
 
+static bool widget_key(struct wlt_widget *widget, unsigned int mask,
+		       uint32_t sym, uint32_t state, bool handled, void *data)
+{
+	struct wlt_theme *theme = data;
+
+	if (handled || state != WL_KEYBOARD_KEY_STATE_PRESSED)
+		return false;
+
+	if (SHL_HAS_BITS(mask, wlt_conf.grab_fullscreen->mods) &&
+	    sym == wlt_conf.grab_fullscreen->keysym) {
+		wlt_window_toggle_fullscreen(theme->wnd);
+		return true;
+	}
+
+	return false;
+}
+
+
 static void widget_destroy(struct wlt_widget *widget, void *data)
 {
 	struct wlt_theme *theme = data;
@@ -565,6 +585,7 @@ int wlt_theme_new(struct wlt_theme **out, struct wlt_window *wnd)
 	wlt_widget_set_pointer_cb(theme->widget, widget_pointer_enter,
 				  widget_pointer_leave, widget_pointer_motion,
 				  widget_pointer_button);
+	wlt_widget_set_keyboard_cb(theme->widget, widget_key);
 	*out = theme;
 	return 0;