tablet: Add binding to activate surfaces using the tablet tool

Based on patches from:
Peter Hutterer <peter.hutterer@who-t.net>
Lyude Paul <thatslyude@gmail.com>
Bastian Farkas <bfarkas@de.adit-jv.com>

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>

desktop-shell/shell.c

@@ -3836,6 +3836,20 @@ touch_to_activate_binding(struct weston_touch *touch,
 			 WESTON_ACTIVATE_FLAG_CONFIGURE);
 }
 
+static void
+tablet_tool_activate_binding(struct weston_tablet_tool *tool,
+			     uint32_t button, void *data)
+{
+	if (tool->grab != &tool->default_grab)
+		return;
+	if (tool->focus == NULL)
+		return;
+
+	activate_binding(tool->seat, data, tool->focus,
+			WESTON_ACTIVATE_FLAG_CLICKED |
+			WESTON_ACTIVATE_FLAG_CONFIGURE);
+}
+
 static void
 unfocus_all_seats(struct desktop_shell *shell)
 {
@@ -4939,6 +4953,8 @@ shell_add_bindings(struct weston_compositor *ec, struct desktop_shell *shell)
 	weston_compositor_add_touch_binding(ec, 0,
 					    touch_to_activate_binding,
 					    shell);
+	weston_compositor_add_tablet_tool_binding(ec, BTN_TOUCH, 0,
+						  tablet_tool_activate_binding, shell);
 	weston_compositor_add_key_binding(ec, KEY_BRIGHTNESSDOWN, 0,
 				          backlight_binding, ec);
 	weston_compositor_add_key_binding(ec, KEY_BRIGHTNESSUP, 0,

include/libweston/libweston.h

@@ -1410,6 +1410,7 @@ struct weston_compositor {
 	struct wl_list modifier_binding_list;
 	struct wl_list button_binding_list;
 	struct wl_list touch_binding_list;
+	struct wl_list tablet_tool_binding_list;
 	struct wl_list axis_binding_list;
 	struct wl_list debug_binding_list;
 
@@ -2089,6 +2090,16 @@ weston_compositor_add_touch_binding(struct weston_compositor *compositor,
 				    weston_touch_binding_handler_t binding,
 				    void *data);
 
+typedef void (*weston_tablet_tool_binding_handler_t)(struct weston_tablet_tool *tool,
+						     uint32_t button,
+						     void *data);
+struct weston_binding *
+weston_compositor_add_tablet_tool_binding(struct weston_compositor *compositor,
+					  uint32_t button,
+					  enum weston_keyboard_modifier modifier,
+					  weston_tablet_tool_binding_handler_t binding,
+					  void *data);
+
 typedef void (*weston_axis_binding_handler_t)(struct weston_pointer *pointer,
 					      const struct timespec *time,
 					      struct weston_pointer_axis_event *event,

libweston/bindings.c

@@ -33,6 +33,7 @@
 #include "libweston-internal.h"
 #include "shared/helpers.h"
 #include "shared/timespec-util.h"
+#include "tablet-unstable-v2-server-protocol.h"
 
 struct weston_binding {
 	uint32_t key;
@@ -137,6 +138,24 @@ weston_compositor_add_touch_binding(struct weston_compositor *compositor,
 	return binding;
 }
 
+WL_EXPORT struct weston_binding *
+weston_compositor_add_tablet_tool_binding(struct weston_compositor *compositor,
+					  uint32_t button, uint32_t modifier,
+					  weston_tablet_tool_binding_handler_t handler,
+					  void *data)
+{
+	struct weston_binding *binding;
+
+	binding = weston_compositor_add_binding(compositor, 0, button, 0,
+						modifier, handler, data);
+	if (binding == NULL)
+		return NULL;
+
+	wl_list_insert(compositor->tablet_tool_binding_list.prev, &binding->link);
+
+	return binding;
+}
+
 WL_EXPORT struct weston_binding *
 weston_compositor_add_axis_binding(struct weston_compositor *compositor,
 				   uint32_t axis, uint32_t modifier,
@@ -395,6 +414,25 @@ weston_compositor_run_touch_binding(struct weston_compositor *compositor,
 	}
 }
 
+void
+weston_compositor_run_tablet_tool_binding(struct weston_compositor *compositor,
+					  struct weston_tablet_tool *tool,
+					  uint32_t button, uint32_t state_w)
+{
+	enum zwp_tablet_tool_v2_button_state state = state_w;
+	struct weston_binding *b;
+
+	if (state != ZWP_TABLET_TOOL_V2_BUTTON_STATE_PRESSED)
+		return;
+
+	wl_list_for_each(b, &compositor->tablet_tool_binding_list, link) {
+		if (b->modifier == tool->seat->modifier_state) {
+			weston_tablet_tool_binding_handler_t handler = b->handler;
+			handler(tool, button, b->data);
+		}
+	}
+}
+
 int
 weston_compositor_run_axis_binding(struct weston_compositor *compositor,
 				   struct weston_pointer *pointer,

libweston/compositor.c

@@ -8539,6 +8539,7 @@ weston_compositor_create(struct wl_display *display,
 	wl_list_init(&ec->modifier_binding_list);
 	wl_list_init(&ec->button_binding_list);
 	wl_list_init(&ec->touch_binding_list);
+	wl_list_init(&ec->tablet_tool_binding_list);
 	wl_list_init(&ec->axis_binding_list);
 	wl_list_init(&ec->debug_binding_list);
 	wl_list_init(&ec->tablet_manager_resource_list);

libweston/input.c

@@ -38,6 +38,7 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <errno.h>
+#include <linux/input.h>
 
 #include "shared/helpers.h"
 #include "shared/os-compatibility.h"
@@ -3462,6 +3463,9 @@ notify_tablet_tool_button(struct weston_tablet_tool *tool,
 	}
 
 	tool->grab_serial = wl_display_next_serial(compositor->wl_display);
+
+	weston_compositor_run_tablet_tool_binding(compositor, tool, button, state);
+
 	grab->interface->button(grab, time, button, state);
 }
 
@@ -3478,6 +3482,8 @@ notify_tablet_tool_down(struct weston_tablet_tool *tool,
 	 tool->grab_serial = wl_display_get_serial(compositor->wl_display);
 	 tool->grab_pos = tool->pos;
 
+	 weston_compositor_run_tablet_tool_binding(compositor, tool, BTN_TOUCH,
+						   ZWP_TABLET_TOOL_V2_BUTTON_STATE_PRESSED);
 	 grab->interface->down(grab, time);
 }
 

libweston/libweston-internal.h

@@ -224,6 +224,10 @@ weston_compositor_run_touch_binding(struct weston_compositor *compositor,
 				    const struct timespec *time,
 				    int touch_type);
 void
+weston_compositor_run_tablet_tool_binding(struct weston_compositor *compositor,
+					  struct weston_tablet_tool *tool,
+					  uint32_t button, uint32_t state_w);
+void
 weston_compositor_stack_plane(struct weston_compositor *ec,
 			      struct weston_plane *plane,
 			      struct weston_plane *above);