Implement foreign-toplevel output movement

src/input/cursor.cpp

@@ -1,6 +1,7 @@
 #include "cursor.hpp"
 
 #include "input/constraint.hpp"
+#include "output.hpp"
 #include "seat.hpp"
 #include "server.hpp"
 #include "surface/surface.hpp"
@@ -12,7 +13,6 @@
 #include "wlr-wrap-start.hpp"
 #include <wlr/types/wlr_idle_notify_v1.h>
 #include <wlr/types/wlr_pointer.h>
-#include <wlr/types/wlr_scene.h>
 #include <wlr/types/wlr_seat.h>
 #include <wlr/util/edges.h>
 #include "wlr-wrap-end.hpp"
@@ -67,18 +67,22 @@ void Cursor::process_resize(const uint32_t time) const {
 	const int new_width = new_right - new_left;
 	const int new_height = new_bottom - new_top;
 	view.set_size(new_width, new_height);
+
+	view.update_outputs();
 }
 
 void Cursor::process_move(const uint32_t time) {
 	(void) time;
 
+	set_image("fleur");
+
 	/* Move the grabbed view to the new position. */
-	View* view = seat.server.grabbed_view;
-	view->current.x = static_cast<int32_t>(std::round(wlr.x - seat.server.grab_x));
-	view->current.y = static_cast<int32_t>(std::round(std::fmax(wlr.y - seat.server.grab_y, 0)));
+	View& view = *seat.server.grabbed_view;
+	const auto new_x = static_cast<int32_t>(std::round(wlr.x - seat.server.grab_x));
+	const auto new_y = static_cast<int32_t>(std::round(std::fmax(wlr.y - seat.server.grab_y, 0)));
+	view.set_position(new_x, new_y);
 
-	set_image("fleur");
-	wlr_scene_node_set_position(view->scene_node, view->current.x, view->current.y);
+	view.update_outputs();
 }
 
 /* This event is forwarded by the cursor when a pointer emits an axis event,

src/surface/view.cpp

@@ -1,5 +1,7 @@
 #include "view.hpp"
 
+#include <utility>
+
 #include "foreign_toplevel.hpp"
 #include "input/seat.hpp"
 #include "output.hpp"
@@ -117,6 +119,21 @@ void View::set_size(const int new_width, const int new_height) {
 	impl_set_size(new_width, new_height);
 }
 
+void View::update_outputs() const {
+	for (auto& output : std::as_const(get_server().outputs)) {
+		wlr_box output_area = output->full_area;
+		wlr_box prev_intersect = {}, curr_intersect = {};
+		wlr_box_intersection(&prev_intersect, &previous, &output_area);
+		wlr_box_intersection(&curr_intersect, &current, &output_area);
+
+		if (wlr_box_empty(&prev_intersect) && !wlr_box_empty(&curr_intersect)) {
+			toplevel_handle->output_enter(*output);
+		} else if (!wlr_box_empty(&prev_intersect) && wlr_box_empty(&curr_intersect)) {
+			toplevel_handle->output_leave(*output);
+		}
+	}
+}
+
 void View::set_activated(const bool activated) {
 	impl_set_activated(activated);
 
@@ -168,6 +185,7 @@ void View::stack() {
 	impl_set_maximized(false);
 	impl_set_fullscreen(false);
 	set_position(previous.x, previous.y);
+	update_outputs();
 }
 
 bool View::maximize() {
@@ -181,6 +199,7 @@ bool View::maximize() {
 	impl_set_fullscreen(false);
 	impl_set_maximized(true);
 	set_position(output_box.x, output_box.y);
+	update_outputs();
 
 	return true;
 }
@@ -195,6 +214,7 @@ bool View::fullscreen() {
 	set_size(output_box.width, output_box.height);
 	impl_set_fullscreen(true);
 	set_position(output_box.x, output_box.y);
+	update_outputs();
 
 	return true;
 }

src/surface/view.hpp

@@ -18,9 +18,8 @@ struct View : Surface {
 	ViewPlacement prev_placement = VIEW_PLACEMENT_STACKING;
 	ViewPlacement curr_placement = VIEW_PLACEMENT_STACKING;
 	bool is_minimized = false;
-	wlr_box current;
-	wlr_box pending;
-	wlr_box previous;
+	wlr_box current = {};
+	wlr_box previous = {};
 	std::optional<ForeignToplevelHandle> toplevel_handle = {};
 
 	~View() noexcept override = default;
@@ -36,6 +35,7 @@ struct View : Surface {
 	void begin_interactive(CursorMode mode, uint32_t edges);
 	void set_position(int new_x, int new_y);
 	void set_size(int new_width, int new_height);
+	void update_outputs() const;
 	void set_activated(bool activated);
 	void set_placement(ViewPlacement new_placement, bool force = false);
 	void set_minimized(bool minimized);

src/surface/xdg_view.cpp

@@ -197,7 +197,7 @@ wlr_box XdgView::get_geometry() const {
 
 void XdgView::map() {
 	if (pending_map) {
-		previous = {0, 0, 0, 0};
+		wlr_xdg_surface_get_geometry(xdg_toplevel.base, &previous);
 		wlr_xdg_surface_get_geometry(xdg_toplevel.base, &current);
 
 		if (!server.outputs.empty()) {