shell: modifier bindings configurable

This patch makes the main modifier configurable.  We used to hardcode super
(windows key) for most bindings, but now that can be changed.

The change affects two key bindings: rotation moves to mod+right click
and backlight moves to from ctrl+f9/f10 to mod+f9/f10.

Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>

src/shell.c

@@ -77,6 +77,7 @@ struct desktop_shell {
 		struct weston_process process;
 	} screensaver;
 
+	uint32_t binding_modifier;
 	struct weston_surface *debug_repaint_surface;
 };
 
@@ -227,16 +228,34 @@ static void
 center_on_output(struct weston_surface *surface,
 		 struct weston_output *output);
 
+static uint32_t
+get_modifier(char *modifier)
+{
+	if (!modifier)
+		return MODIFIER_SUPER;
+
+	if (!strcmp("ctrl", modifier))
+		return MODIFIER_CTRL;
+	else if (!strcmp("alt", modifier))
+		return MODIFIER_ALT;
+	else if (!strcmp("super", modifier))
+		return MODIFIER_SUPER;
+	else
+		return MODIFIER_SUPER;
+}
+
 static void
 shell_configuration(struct desktop_shell *shell)
 {
 	char *config_file;
 	char *path = NULL;
 	int duration = 60;
+	char *modifier = NULL;
 
 	struct config_key saver_keys[] = {
 		{ "path",       CONFIG_KEY_STRING,  &path },
 		{ "duration",   CONFIG_KEY_INTEGER, &duration },
+		{ "binding-modifier",   CONFIG_KEY_STRING, &modifier },
 	};
 
 	struct config_section cs[] = {
@@ -249,6 +268,7 @@ shell_configuration(struct desktop_shell *shell)
 
 	shell->screensaver.path = path;
 	shell->screensaver.duration = duration;
+	shell->binding_modifier = get_modifier(modifier);
 }
 
 static void
@@ -2276,7 +2296,7 @@ switcher_key(struct wl_keyboard_grab *grab,
 	struct weston_input_device *device =
 		(struct weston_input_device *) grab->input_device;
 
-	if ((device->modifier_state & MODIFIER_SUPER) == 0) {
+	if ((device->modifier_state & switcher->shell->binding_modifier) == 0) {
 		switcher_destroy(switcher, time);
 	} else if (key == KEY_TAB && state) {
 		switcher_next(switcher);
@@ -2387,6 +2407,47 @@ shell_destroy(struct wl_listener *listener, void *data)
 	free(shell);
 }
 
+static void
+shell_add_bindings(struct weston_compositor *ec, struct desktop_shell *shell)
+{
+	uint32_t mod;
+
+	/* fixed bindings */
+	weston_compositor_add_binding(ec, KEY_BACKSPACE, 0, 0,
+				      MODIFIER_CTRL | MODIFIER_ALT,
+				      terminate_binding, ec);
+	weston_compositor_add_binding(ec, 0, BTN_LEFT, 0, 0,
+				      click_to_activate_binding, shell);
+	weston_compositor_add_binding(ec, 0, 0,
+				      WL_INPUT_DEVICE_AXIS_VERTICAL_SCROLL,
+				      MODIFIER_SUPER | MODIFIER_ALT,
+				      surface_opacity_binding, NULL);
+	weston_compositor_add_binding(ec, 0, 0,
+				      WL_INPUT_DEVICE_AXIS_VERTICAL_SCROLL,
+				      MODIFIER_SUPER, zoom_binding, NULL);
+
+	/* configurable bindings */
+	mod = shell->binding_modifier;
+	weston_compositor_add_binding(ec, 0, BTN_LEFT, 0, mod,
+				      move_binding, shell);
+	weston_compositor_add_binding(ec, 0, BTN_MIDDLE, 0, mod,
+				      resize_binding, shell);
+	weston_compositor_add_binding(ec, 0, BTN_RIGHT, 0, mod,
+				      rotate_binding, NULL);
+	weston_compositor_add_binding(ec, KEY_TAB, 0, 0, mod,
+				      switcher_binding, shell);
+	weston_compositor_add_binding(ec, KEY_F9, 0, 0, mod,
+				      backlight_binding, ec);
+	weston_compositor_add_binding(ec, KEY_BRIGHTNESSDOWN, 0, 0, 0,
+				      backlight_binding, ec);
+	weston_compositor_add_binding(ec, KEY_F10, 0, 0, mod,
+				      backlight_binding, ec);
+	weston_compositor_add_binding(ec, KEY_BRIGHTNESSUP, 0, 0, 0,
+				      backlight_binding, ec);
+	weston_compositor_add_binding(ec, KEY_SPACE, 0, 0, mod,
+				      debug_repaint_binding, shell);
+}
+
 int
 shell_init(struct weston_compositor *ec);
 
@@ -2440,38 +2501,7 @@ shell_init(struct weston_compositor *ec)
 	if (launch_desktop_shell_process(shell) != 0)
 		return -1;
 
-	weston_compositor_add_binding(ec, 0, BTN_LEFT, 0, MODIFIER_SUPER,
-					move_binding, shell);
-	weston_compositor_add_binding(ec, 0, BTN_MIDDLE, 0, MODIFIER_SUPER,
-					resize_binding, shell);
-	weston_compositor_add_binding(ec, KEY_BACKSPACE, 0, 0,
-					MODIFIER_CTRL | MODIFIER_ALT,
-					terminate_binding, ec);
-	weston_compositor_add_binding(ec, 0, BTN_LEFT, 0, 0,
-					click_to_activate_binding, shell);
-	weston_compositor_add_binding(ec, 0, 0, WL_INPUT_DEVICE_AXIS_VERTICAL_SCROLL,
-					MODIFIER_SUPER | MODIFIER_ALT,
-					surface_opacity_binding, NULL);
-	weston_compositor_add_binding(ec, 0, 0, WL_INPUT_DEVICE_AXIS_VERTICAL_SCROLL,
-					MODIFIER_SUPER, zoom_binding, NULL);
-	weston_compositor_add_binding(ec, 0, BTN_LEFT, 0,
-					MODIFIER_SUPER | MODIFIER_ALT,
-					rotate_binding, NULL);
-	weston_compositor_add_binding(ec, KEY_TAB, 0, 0, MODIFIER_SUPER,
-					switcher_binding, shell);
-
-	/* brightness */
-	weston_compositor_add_binding(ec, KEY_F9, 0, 0, MODIFIER_CTRL,
-					backlight_binding, ec);
-	weston_compositor_add_binding(ec, KEY_BRIGHTNESSDOWN, 0, 0, 0,
-					backlight_binding, ec);
-	weston_compositor_add_binding(ec, KEY_F10, 0, 0, MODIFIER_CTRL,
-					backlight_binding, ec);
-	weston_compositor_add_binding(ec, KEY_BRIGHTNESSUP, 0, 0, 0,
-					backlight_binding, ec);
-
-	weston_compositor_add_binding(ec, KEY_SPACE, 0, 0, MODIFIER_SUPER,
-					debug_repaint_binding, shell);
+	shell_add_bindings(ec, shell);
 
 	return 0;
 }

weston.ini

@@ -28,4 +28,4 @@ path=./clients/flower
 [screensaver]
 #path=./clients/wscreensaver
 duration=600
-
+#binding-modifier=ctrl