resize resistance support

include/labwc.h

@@ -346,6 +346,8 @@ void subsurface_create(struct view *view, struct wlr_subsurface *wlr_subsurface)
 
 void view_set_activated(struct view *view, bool activated);
 void move_resistance(struct view *view, double *x, double *y, bool screen_edge);
+void resize_resistance(struct view *view, struct wlr_box *new_view_geo,
+	bool screen_edge);
 struct border view_border(struct view *view);
 void view_move_resize(struct view *view, struct wlr_box geo);
 void view_move(struct view *view, double x, double y);

src/cursor.c

@@ -125,6 +125,7 @@ process_cursor_resize(struct server *server, uint32_t time)
 		new_view_geo.width = server->grab_box.width + dx;
 	}
 
+	resize_resistance(view, &new_view_geo, true);
 	view_move_resize(view, new_view_geo);
 }
 

src/strength.c

@@ -54,3 +54,70 @@ move_resistance(struct view *view, double *x, double *y, bool screen_edge)
 		}
 	}
 }
+
+void
+resize_resistance(struct view *view, struct wlr_box *new_view_geo,
+		bool screen_edge)
+{
+	struct server *server = view->server;
+	struct output *output;
+	struct wlr_box mgeom;
+	struct border border = view_border(view);
+	int l, r, t, b; /* The edges of the current view */
+	int tl, tr, tt, tb; /* The desired edges */
+	int ml, mr, mt, mb; /* The edges of the monitor/other view */
+
+	l = view->x - border.left - rc.gap;
+	t = view->y - border.top - rc.gap;
+	r = view->x + view->w + border.right + rc.gap;
+	b = view->y + view->h + border.bottom + rc.gap;
+
+	tl = new_view_geo->x - border.left - rc.gap;
+	tt = new_view_geo->y - border.top - rc.gap;
+	tr = new_view_geo->x + new_view_geo->width + border.right + rc.gap;
+	tb = new_view_geo->y + new_view_geo->height + border.bottom + rc.gap;
+
+	if (screen_edge) {
+		if (!rc.screen_edge_strength) {
+			return;
+		}
+		wl_list_for_each(output, &server->outputs, link) {
+			mgeom = output_usable_area_in_layout_coords(output);
+			ml = mgeom.x;
+			mt = mgeom.y;
+			mr = mgeom.x + mgeom.width;
+			mb = mgeom.y + mgeom.height;
+
+			if (server->resize_edges & WLR_EDGE_LEFT) {
+				if (l >= ml && tl < ml && tl >= ml
+						- rc.screen_edge_strength) {
+					new_view_geo->x = ml + border.left
+						+ rc.gap;
+					new_view_geo->width = view->w;
+				}
+			} else if (server->resize_edges & WLR_EDGE_RIGHT) {
+				if (r <= mr && tr > mr && tr <= mr
+						+ rc.screen_edge_strength) {
+					new_view_geo->width = mr - l
+						- (border.right + rc.gap) * 2 ;
+				}
+			}
+
+			if (server->resize_edges & WLR_EDGE_TOP) {
+				if (t >= mt && tt < mt && tt >= mt
+						- rc.screen_edge_strength) {
+					new_view_geo->y = mt + border.top
+						+ rc.gap;
+					new_view_geo->height = view->h;
+				}
+			} else if (server->resize_edges & WLR_EDGE_BOTTOM) {
+				if (b <= mb && tb > mb && tb <= mb
+						+ rc.screen_edge_strength) {
+					new_view_geo->height = mb - t
+						- border.bottom - border.top
+						- rc.gap * 2;
+				}
+			}
+		}
+	}
+}