src/data_device.c: add dnd support for touch screen

Adding the drag and drop grab interface for touch screen in
src/data-device.c, so the server can handle touch screen
drag and drop operation.

Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
Reviewed-by: Kristian Hogsberg <hoegsberg@gmail.com>

1 files changed, 281 insertions, 65 deletions

diff --git a/src/data-device.c b/src/data-device.c
index 313278e9..5ef69d19 100644
--- a/src/data-device.c
+++ b/src/data-device.c
@@ -37,12 +37,21 @@ struct weston_drag {
 	struct weston_view *focus;
 	struct wl_resource *focus_resource;
 	struct wl_listener focus_listener;
-	struct weston_pointer_grab grab;
 	struct weston_view *icon;
 	struct wl_listener icon_destroy_listener;
 	int32_t dx, dy;
 };
 
+struct weston_pointer_drag {
+	struct weston_drag  base;
+	struct weston_pointer_grab grab;
+};
+
+struct weston_touch_drag {
+	struct weston_drag base;
+	struct weston_touch_grab grab;
+};
+
 static void
 empty_region(pixman_region32_t *region)
 {
@@ -172,17 +181,21 @@ static struct wl_data_source_interface data_source_interface = {
 };
 
 static void
-drag_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy, int32_t width, int32_t height)
+drag_surface_configure(struct weston_drag *drag,
+		struct weston_pointer *pointer,
+		struct weston_touch   *touch,
+		struct weston_surface *es, int32_t sx, int32_t sy,
+		int32_t width, int32_t height)
 {
-	struct weston_drag *drag = es->configure_private;
-	struct weston_pointer *pointer = drag->grab.pointer;
 	struct wl_list *list;
 	float fx, fy;
 
-	assert(es->configure == drag_surface_configure);
+	assert((pointer != NULL && touch == NULL) ||
+			(pointer == NULL && touch != NULL));
 
 	if (!weston_surface_is_mapped(es) && es->buffer_ref.buffer) {
-		if (pointer->sprite && weston_view_is_mapped(pointer->sprite))
+		if (pointer && pointer->sprite &&
+			weston_view_is_mapped(pointer->sprite))
 			list = &pointer->sprite->layer_link;
 		else
 			list = &es->compositor->cursor_layer.view_list;
@@ -196,12 +209,41 @@ drag_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy, int32_
 	drag->dx += sx;
 	drag->dy += sy;
 
-	fx = wl_fixed_to_double(pointer->x) + drag->dx;
-	fy = wl_fixed_to_double(pointer->y) + drag->dy;
+	/* init to 0 for avoiding a compile warning */
+	fx = fy = 0;
+	if (pointer) {
+		fx = wl_fixed_to_double(pointer->x) + drag->dx;
+		fy = wl_fixed_to_double(pointer->y) + drag->dy;
+	} else if (touch) {
+		fx = wl_fixed_to_double(touch->grab_x) + drag->dx;
+		fy = wl_fixed_to_double(touch->grab_y) + drag->dy;
+	}
 	weston_view_configure(drag->icon, fx, fy, width, height);
 }
 
 static void
+pointer_drag_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy, int32_t width, int32_t height)
+{
+	struct weston_pointer_drag *drag = es->configure_private;
+	struct weston_pointer *pointer = drag->grab.pointer;
+
+	assert(es->configure == pointer_drag_surface_configure);
+
+	drag_surface_configure(&drag->base, pointer, NULL, es, sx, sy, width, height);
+}
+
+static void
+touch_drag_surface_configure(struct weston_surface *es, int32_t sx, int32_t sy, int32_t width, int32_t height)
+{
+	struct weston_touch_drag *drag = es->configure_private;
+	struct weston_touch *touch = drag->grab.touch;
+
+	assert(es->configure == touch_drag_surface_configure);
+
+	drag_surface_configure(&drag->base, NULL, touch, es, sx, sy, width, height);
+}
+
+static void
 destroy_drag_focus(struct wl_listener *listener, void *data)
 {
 	struct weston_drag *drag =
@@ -211,12 +253,13 @@ destroy_drag_focus(struct wl_listener *listener, void *data)
 }
 
 static void
-weston_drag_set_focus(struct weston_drag *drag, struct weston_view *view,
-		      wl_fixed_t sx, wl_fixed_t sy)
+weston_drag_set_focus(struct weston_drag *drag,
+			struct weston_seat *seat,
+			struct weston_view *view,
+			wl_fixed_t sx, wl_fixed_t sy)
 {
-	struct weston_pointer *pointer = drag->grab.pointer;
 	struct wl_resource *resource, *offer = NULL;
-	struct wl_display *display = pointer->seat->compositor->wl_display;
+	struct wl_display *display = seat->compositor->wl_display;
 	uint32_t serial;
 
 	if (drag->focus && view && drag->focus->surface == view->surface) {
@@ -238,7 +281,7 @@ weston_drag_set_focus(struct weston_drag *drag, struct weston_view *view,
 	    wl_resource_get_client(view->surface->resource) != drag->client)
 		return;
 
-	resource = wl_resource_find_for_client(&pointer->seat->drag_resource_list,
+	resource = wl_resource_find_for_client(&seat->drag_resource_list,
 					       wl_resource_get_client(view->surface->resource));
 	if (!resource)
 		return;
@@ -264,8 +307,8 @@ weston_drag_set_focus(struct weston_drag *drag, struct weston_view *view,
 static void
 drag_grab_focus(struct weston_pointer_grab *grab)
 {
-	struct weston_drag *drag =
-		container_of(grab, struct weston_drag, grab);
+	struct weston_pointer_drag *drag =
+		container_of(grab, struct weston_pointer_drag, grab);
 	struct weston_pointer *pointer = grab->pointer;
 	struct weston_view *view;
 	wl_fixed_t sx, sy;
@@ -273,40 +316,41 @@ drag_grab_focus(struct weston_pointer_grab *grab)
 	view = weston_compositor_pick_view(pointer->seat->compositor,
 					   pointer->x, pointer->y,
 					   &sx, &sy);
-	if (drag->focus != view)
-		weston_drag_set_focus(drag, view, sx, sy);
+	if (drag->base.focus != view)
+		weston_drag_set_focus(&drag->base, pointer->seat, view, sx, sy);
 }
 
 static void
 drag_grab_motion(struct weston_pointer_grab *grab, uint32_t time,
 		 wl_fixed_t x, wl_fixed_t y)
 {
-	struct weston_drag *drag =
-		container_of(grab, struct weston_drag, grab);
+	struct weston_pointer_drag *drag =
+		container_of(grab, struct weston_pointer_drag, grab);
 	struct weston_pointer *pointer = drag->grab.pointer;
 	float fx, fy;
 	wl_fixed_t sx, sy;
 
 	weston_pointer_move(pointer, x, y);
 
-	if (drag->icon) {
-		fx = wl_fixed_to_double(pointer->x) + drag->dx;
-		fy = wl_fixed_to_double(pointer->y) + drag->dy;
-		weston_view_set_position(drag->icon, fx, fy);
-		weston_view_schedule_repaint(drag->icon);
+	if (drag->base.icon) {
+		fx = wl_fixed_to_double(pointer->x) + drag->base.dx;
+		fy = wl_fixed_to_double(pointer->y) + drag->base.dy;
+		weston_view_set_position(drag->base.icon, fx, fy);
+		weston_view_schedule_repaint(drag->base.icon);
 	}
 
-	if (drag->focus_resource) {
-		weston_view_from_global_fixed(drag->focus,
+	if (drag->base.focus_resource) {
+		weston_view_from_global_fixed(drag->base.focus,
 					      pointer->x, pointer->y,
 					      &sx, &sy);
 
-		wl_data_device_send_motion(drag->focus_resource, time, sx, sy);
+		wl_data_device_send_motion(drag->base.focus_resource, time, sx, sy);
 	}
 }
 
 static void
-data_device_end_drag_grab(struct weston_drag *drag)
+data_device_end_drag_grab(struct weston_drag *drag,
+		struct weston_seat *seat)
 {
 	if (drag->icon) {
 		if (weston_view_is_mapped(drag->icon))
@@ -318,10 +362,16 @@ data_device_end_drag_grab(struct weston_drag *drag)
 		weston_view_destroy(drag->icon);
 	}
 
-	weston_drag_set_focus(drag, NULL, 0, 0);
+	weston_drag_set_focus(drag, seat, NULL, 0, 0);
+}
 
-	weston_pointer_end_grab(drag->grab.pointer);
+static void
+data_device_end_pointer_drag_grab(struct weston_pointer_drag *drag)
+{
+	struct weston_pointer *pointer = drag->grab.pointer;
 
+	data_device_end_drag_grab(&drag->base, pointer->seat);
+	weston_pointer_end_grab(pointer);
 	free(drag);
 }
 
@@ -329,37 +379,37 @@ static void
 drag_grab_button(struct weston_pointer_grab *grab,
 		 uint32_t time, uint32_t button, uint32_t state_w)
 {
-	struct weston_drag *drag =
-		container_of(grab, struct weston_drag, grab);
+	struct weston_pointer_drag *drag =
+		container_of(grab, struct weston_pointer_drag, grab);
 	struct weston_pointer *pointer = drag->grab.pointer;
 	enum wl_pointer_button_state state = state_w;
 
-	if (drag->focus_resource &&
+	if (drag->base.focus_resource &&
 	    pointer->grab_button == button &&
 	    state == WL_POINTER_BUTTON_STATE_RELEASED)
-		wl_data_device_send_drop(drag->focus_resource);
+		wl_data_device_send_drop(drag->base.focus_resource);
 
 	if (pointer->button_count == 0 &&
 	    state == WL_POINTER_BUTTON_STATE_RELEASED) {
-		if (drag->data_source)
-			wl_list_remove(&drag->data_source_listener.link);
-		data_device_end_drag_grab(drag);
+		if (drag->base.data_source)
+			wl_list_remove(&drag->base.data_source_listener.link);
+		data_device_end_pointer_drag_grab(drag);
 	}
 }
 
 static void
 drag_grab_cancel(struct weston_pointer_grab *grab)
 {
-	struct weston_drag *drag =
-		container_of(grab, struct weston_drag, grab);
+	struct weston_pointer_drag *drag =
+		container_of(grab, struct weston_pointer_drag, grab);
 
-	if (drag->data_source)
-		wl_list_remove(&drag->data_source_listener.link);
+	if (drag->base.data_source)
+		wl_list_remove(&drag->base.data_source_listener.link);
 
-	data_device_end_drag_grab(drag);
+	data_device_end_pointer_drag_grab(drag);
 }
 
-static const struct weston_pointer_grab_interface drag_grab_interface = {
+static const struct weston_pointer_grab_interface pointer_drag_grab_interface = {
 	drag_grab_focus,
 	drag_grab_motion,
 	drag_grab_button,
@@ -367,12 +417,109 @@ static const struct weston_pointer_grab_interface drag_grab_interface = {
 };
 
 static void
-destroy_data_device_source(struct wl_listener *listener, void *data)
+drag_grab_touch_down(struct weston_touch_grab *grab, uint32_t time,
+		int touch_id, wl_fixed_t sx, wl_fixed_t sy)
 {
-	struct weston_drag *drag = container_of(listener, struct weston_drag,
-						data_source_listener);
+}
+
+static void
+data_device_end_touch_drag_grab(struct weston_touch_drag *drag)
+{
+	struct weston_touch *touch = drag->grab.touch;
+
+	data_device_end_drag_grab(&drag->base, touch->seat);
+	weston_touch_end_grab(touch);
+	free(drag);
+}
+
+static void
+drag_grab_touch_up(struct weston_touch_grab *grab,
+		uint32_t time, int touch_id)
+{
+	struct weston_touch_drag *touch_drag =
+		container_of(grab, struct weston_touch_drag, grab);
+	struct weston_touch *touch = grab->touch;
+
+	if (touch_id != touch->grab_touch_id)
+		return;
+
+	if (touch_drag->base.focus_resource)
+		wl_data_device_send_drop(touch_drag->base.focus_resource);
+	if (touch_drag->base.data_source)
+		wl_list_remove(&touch_drag->base.data_source_listener.link);
+	data_device_end_touch_drag_grab(touch_drag);
+}
+
+static void
+drag_grab_touch_focus(struct weston_touch_drag *drag)
+{
+	struct weston_touch *touch = drag->grab.touch;
+	struct weston_view *view;
+	wl_fixed_t view_x, view_y;
+
+	view = weston_compositor_pick_view(touch->seat->compositor,
+				touch->grab_x, touch->grab_y,
+				&view_x, &view_y);
+	if (drag->base.focus != view)
+		weston_drag_set_focus(&drag->base, touch->seat,
+				view, view_x, view_y);
+}
 
-	data_device_end_drag_grab(drag);
+static void
+drag_grab_touch_motion(struct weston_touch_grab *grab, uint32_t time,
+		int touch_id, wl_fixed_t sx, wl_fixed_t sy)
+{
+	struct weston_touch_drag *touch_drag =
+		container_of(grab, struct weston_touch_drag, grab);
+	struct weston_touch *touch = grab->touch;
+	wl_fixed_t view_x, view_y;
+	float fx, fy;
+
+	if (touch_id != touch->grab_touch_id)
+		return;
+
+	drag_grab_touch_focus(touch_drag);
+	if (touch_drag->base.icon) {
+		fx = wl_fixed_to_double(touch->grab_x) + touch_drag->base.dx;
+		fy = wl_fixed_to_double(touch->grab_y) + touch_drag->base.dy;
+		weston_view_set_position(touch_drag->base.icon, fx, fy);
+		weston_view_schedule_repaint(touch_drag->base.icon);
+	}
+
+	if (touch_drag->base.focus_resource) {
+		weston_view_from_global_fixed(touch_drag->base.focus,
+					touch->grab_x, touch->grab_y,
+					&view_x, &view_y);
+		wl_data_device_send_motion(touch_drag->base.focus_resource, time,
+					view_x, view_y);
+	}
+}
+
+static void
+drag_grab_touch_cancel(struct weston_touch_grab *grab)
+{
+	struct weston_touch_drag *touch_drag =
+		container_of(grab, struct weston_touch_drag, grab);
+
+	if (touch_drag->base.data_source)
+		wl_list_remove(&touch_drag->base.data_source_listener.link);
+	data_device_end_touch_drag_grab(touch_drag);
+}
+
+static const struct weston_touch_grab_interface touch_drag_grab_interface = {
+	drag_grab_touch_down,
+	drag_grab_touch_up,
+	drag_grab_touch_motion,
+	drag_grab_touch_cancel
+};
+
+static void
+destroy_pointer_data_device_source(struct wl_listener *listener, void *data)
+{
+	struct weston_pointer_drag *drag = container_of(listener,
+			struct weston_pointer_drag, base.data_source_listener);
+
+	data_device_end_pointer_drag_grab(drag);
 }
 
 static void
@@ -385,47 +532,102 @@ handle_drag_icon_destroy(struct wl_listener *listener, void *data)
 }
 
 WL_EXPORT int
-weston_seat_start_drag(struct weston_seat *seat,
+weston_pointer_start_drag(struct weston_pointer *pointer,
 		       struct weston_data_source *source,
 		       struct weston_surface *icon,
 		       struct wl_client *client)
 {
-	struct weston_drag *drag;
+	struct weston_pointer_drag *drag;
 
 	drag = zalloc(sizeof *drag);
 	if (drag == NULL)
 		return -1;
 
-	drag->grab.interface = &drag_grab_interface;
-	drag->client = client;
-	drag->data_source = source;
+	drag->grab.interface = &pointer_drag_grab_interface;
+	drag->base.client = client;
+	drag->base.data_source = source;
 
 	if (icon) {
-		drag->icon = weston_view_create(icon);
-		if (drag->icon == NULL) {
+		drag->base.icon = weston_view_create(icon);
+		if (drag->base.icon == NULL) {
 			free(drag);
 			return -1;
 		}
 
-		drag->icon_destroy_listener.notify = handle_drag_icon_destroy;
+		drag->base.icon_destroy_listener.notify = handle_drag_icon_destroy;
 		wl_signal_add(&icon->destroy_signal,
-			      &drag->icon_destroy_listener);
+			      &drag->base.icon_destroy_listener);
 
-		icon->configure = drag_surface_configure;
+		icon->configure = pointer_drag_surface_configure;
 		icon->configure_private = drag;
 	} else {
-		drag->icon = NULL;
+		drag->base.icon = NULL;
 	}
 
 	if (source) {
-		drag->data_source_listener.notify = destroy_data_device_source;
+		drag->base.data_source_listener.notify = destroy_pointer_data_device_source;
 		wl_signal_add(&source->destroy_signal,
-			      &drag->data_source_listener);
+			      &drag->base.data_source_listener);
 	}
 
-	weston_pointer_set_focus(seat->pointer, NULL,
+	weston_pointer_set_focus(pointer, NULL,
 				 wl_fixed_from_int(0), wl_fixed_from_int(0));
-	weston_pointer_start_grab(seat->pointer, &drag->grab);
+	weston_pointer_start_grab(pointer, &drag->grab);
+
+	return 0;
+}
+
+static void
+destroy_touch_data_device_source(struct wl_listener *listener, void *data)
+{
+	struct weston_touch_drag *drag = container_of(listener,
+			struct weston_touch_drag, base.data_source_listener);
+
+	data_device_end_touch_drag_grab(drag);
+}
+
+WL_EXPORT int
+weston_touch_start_drag(struct weston_touch *touch,
+		       struct weston_data_source *source,
+		       struct weston_surface *icon,
+		       struct wl_client *client)
+{
+	struct weston_touch_drag *drag;
+
+	drag = zalloc(sizeof *drag);
+	if (drag == NULL)
+		return -1;
+
+	drag->grab.interface = &touch_drag_grab_interface;
+	drag->base.client = client;
+	drag->base.data_source = source;
+
+	if (icon) {
+		drag->base.icon = weston_view_create(icon);
+		if (drag->base.icon == NULL) {
+			free(drag);
+			return -1;
+		}
+
+		drag->base.icon_destroy_listener.notify = handle_drag_icon_destroy;
+		wl_signal_add(&icon->destroy_signal,
+			      &drag->base.icon_destroy_listener);
+
+		icon->configure = touch_drag_surface_configure;
+		icon->configure_private = drag;
+	} else {
+		drag->base.icon = NULL;
+	}
+
+	if (source) {
+		drag->base.data_source_listener.notify = destroy_touch_data_device_source;
+		wl_signal_add(&source->destroy_signal,
+			      &drag->base.data_source_listener);
+	}
+
+	weston_touch_start_grab(touch, &drag->grab);
+
+	drag_grab_touch_focus(drag);
 
 	return 0;
 }
@@ -439,11 +641,15 @@ data_device_start_drag(struct wl_client *client, struct wl_resource *resource,
 	struct weston_seat *seat = wl_resource_get_user_data(resource);
 	struct weston_data_source *source = NULL;
 	struct weston_surface *icon = NULL;
+	int32_t ret = 0;
 
-	if (seat->pointer->button_count == 0 ||
+	if ((seat->pointer->button_count == 0 ||
 	    seat->pointer->grab_serial != serial ||
 	    !seat->pointer->focus ||
-	    seat->pointer->focus->surface != wl_resource_get_user_data(origin_resource))
+	    seat->pointer->focus->surface != wl_resource_get_user_data(origin_resource)) &&
+		(seat->touch->grab_serial != serial ||
+		!seat->touch->focus ||
+		seat->touch->focus->surface != wl_resource_get_user_data(origin_resource)))
 		return;
 
 	/* FIXME: Check that the data source type array isn't empty. */
@@ -459,7 +665,17 @@ data_device_start_drag(struct wl_client *client, struct wl_resource *resource,
 		return;
 	}
 
-	if (weston_seat_start_drag(seat, source, icon, client) < 0)
+	if (seat->pointer->button_count == 1 &&
+		seat->pointer->grab_serial == serial &&
+		seat->pointer->focus &&
+		seat->pointer->focus->surface == wl_resource_get_user_data(origin_resource))
+		ret = weston_pointer_start_drag(seat->pointer, source, icon, client);
+	else if (seat->touch->grab_serial != serial ||
+		seat->touch->focus ||
+		seat->touch->focus->surface != wl_resource_get_user_data(origin_resource))
+		ret = weston_touch_start_drag(seat->touch, source, icon, client);
+
+	if (ret < 0)
 		wl_resource_post_no_memory(resource);
 }