Consider view's min/max sizes when resizing

include/sway/tree/view.h

@@ -26,6 +26,8 @@ enum sway_view_prop {
 };
 
 struct sway_view_impl {
+	void (*get_constraints)(struct sway_view *view, double *min_width,
+			double *max_width, double *min_height, double *max_height);
 	const char *(*get_string_prop)(struct sway_view *view,
 			enum sway_view_prop prop);
 	uint32_t (*get_int_prop)(struct sway_view *view, enum sway_view_prop prop);
@@ -215,6 +217,9 @@ uint32_t view_get_window_type(struct sway_view *view);
 
 const char *view_get_shell(struct sway_view *view);
 
+void view_get_constraints(struct sway_view *view, double *min_width,
+		double *max_width, double *min_height, double *max_height);
+
 uint32_t view_configure(struct sway_view *view, double lx, double ly, int width,
 	int height);
 

sway/desktop/xdg_shell.c

@@ -1,4 +1,5 @@
 #define _POSIX_C_SOURCE 199309L
+#include <float.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <wayland-server.h>
@@ -95,6 +96,16 @@ static struct sway_xdg_shell_view *xdg_shell_view_from_view(
 	return (struct sway_xdg_shell_view *)view;
 }
 
+static void get_constraints(struct sway_view *view, double *min_width,
+		double *max_width, double *min_height, double *max_height) {
+	struct wlr_xdg_toplevel_state *state =
+		&view->wlr_xdg_surface->toplevel->current;
+	*min_width = state->min_width > 0 ? state->min_width : DBL_MIN;
+	*max_width = state->max_width > 0 ? state->max_width : DBL_MAX;
+	*min_height = state->min_height > 0 ? state->min_height : DBL_MIN;
+	*max_height = state->max_height > 0 ? state->max_height : DBL_MAX;
+}
+
 static const char *get_string_prop(struct sway_view *view, enum sway_view_prop prop) {
 	if (xdg_shell_view_from_view(view) == NULL) {
 		return NULL;
@@ -188,6 +199,7 @@ static void destroy(struct sway_view *view) {
 }
 
 static const struct sway_view_impl view_impl = {
+	.get_constraints = get_constraints,
 	.get_string_prop = get_string_prop,
 	.configure = configure,
 	.set_activated = set_activated,

sway/desktop/xdg_shell_v6.c

@@ -1,4 +1,5 @@
 #define _POSIX_C_SOURCE 199309L
+#include <float.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <wayland-server.h>
@@ -94,6 +95,16 @@ static struct sway_xdg_shell_v6_view *xdg_shell_v6_view_from_view(
 	return (struct sway_xdg_shell_v6_view *)view;
 }
 
+static void get_constraints(struct sway_view *view, double *min_width,
+		double *max_width, double *min_height, double *max_height) {
+	struct wlr_xdg_toplevel_v6_state *state =
+		&view->wlr_xdg_surface_v6->toplevel->current;
+	*min_width = state->min_width > 0 ? state->min_width : DBL_MIN;
+	*max_width = state->max_width > 0 ? state->max_width : DBL_MAX;
+	*min_height = state->min_height > 0 ? state->min_height : DBL_MIN;
+	*max_height = state->max_height > 0 ? state->max_height : DBL_MAX;
+}
+
 static const char *get_string_prop(struct sway_view *view, enum sway_view_prop prop) {
 	if (xdg_shell_v6_view_from_view(view) == NULL) {
 		return NULL;
@@ -184,6 +195,7 @@ static void destroy(struct sway_view *view) {
 }
 
 static const struct sway_view_impl view_impl = {
+	.get_constraints = get_constraints,
 	.get_string_prop = get_string_prop,
 	.configure = configure,
 	.set_activated = set_activated,

sway/input/cursor.c

@@ -243,7 +243,7 @@ static void handle_resize_motion(struct sway_seat *seat,
 		grow_height = seat->op_ref_height * max_multiplier;
 	}
 
-	// Determine new width/height, and accommodate for min/max values
+	// Determine new width/height, and accommodate for floating min/max values
 	double width = seat->op_ref_width + grow_width;
 	double height = seat->op_ref_height + grow_height;
 	int min_width, max_width, min_height, max_height;
@@ -252,6 +252,15 @@ static void handle_resize_motion(struct sway_seat *seat,
 	width = fmax(min_width, fmin(width, max_width));
 	height = fmax(min_height, fmin(height, max_height));
 
+	// Apply the view's min/max size
+	if (con->type == C_VIEW) {
+		double view_min_width, view_max_width, view_min_height, view_max_height;
+		view_get_constraints(con->sway_view, &view_min_width, &view_max_width,
+				&view_min_height, &view_max_height);
+		width = fmax(view_min_width, fmin(width, view_max_width));
+		height = fmax(view_min_height, fmin(height, view_max_height));
+	}
+
 	// Recalculate these, in case we hit a min/max limit
 	grow_width = width - seat->op_ref_width;
 	grow_height = height - seat->op_ref_height;

sway/tree/view.c

@@ -141,6 +141,19 @@ const char *view_get_shell(struct sway_view *view) {
 	return "unknown";
 }
 
+void view_get_constraints(struct sway_view *view, double *min_width,
+		double *max_width, double *min_height, double *max_height) {
+	if (view->impl->get_constraints) {
+		view->impl->get_constraints(view,
+				min_width, max_width, min_height, max_height);
+	} else {
+		*min_width = DBL_MIN;
+		*max_width = DBL_MAX;
+		*min_height = DBL_MIN;
+		*max_height = DBL_MAX;
+	}
+}
+
 uint32_t view_configure(struct sway_view *view, double lx, double ly, int width,
 		int height) {
 	if (view->impl->configure) {