view: add 'struct border margin'

Simplify various view interfaces as a result

include/labwc.h

@@ -112,6 +112,13 @@ struct view_impl {
 	void (*unmap)(struct view *view);
 };
 
+struct border {
+	int top;
+	int right;
+	int bottom;
+	int left;
+};
+
 struct view {
 	struct server *server;
 	enum view_type type;
@@ -127,7 +134,19 @@ struct view {
 	bool mapped;
 	bool been_mapped;
 	bool minimized;
+
+	/* geometry of the wlr_surface contained within the view */
 	int x, y, w, h;
+
+	/*
+	 * margin refers to the space between the extremities of the view and
+	 * wlr_surface - typically made up of decoration.
+	 * For xdg-shell views, the margin is typically negative.
+	 */
+	struct border margin;
+
+	int xdg_grab_offset;
+
 	bool show_server_side_deco;
 
 	struct wl_listener map;
@@ -168,8 +187,6 @@ void xwayland_surface_new(struct wl_listener *listener, void *data);
 void xwayland_unmanaged_create(struct server *server,
 			       struct wlr_xwayland_surface *xsurface);
 
-void view_init_position(struct view *view);
-
 /**
  * view_get_surface_geometry - geometry relative to view
  * @view: toplevel containing the surface to process
@@ -181,7 +198,6 @@ struct wlr_box view_geometry(struct view *view);
 void view_resize(struct view *view, struct wlr_box geo);
 void view_minimize(struct view *view);
 void view_unminimize(struct view *view);
-bool view_hasfocus(struct view *view);
 
 void desktop_focus_view(struct view *view);
 
@@ -218,7 +234,7 @@ void keyboard_new(struct server *server, struct wlr_input_device *device);
 void output_frame(struct wl_listener *listener, void *data);
 void output_new(struct wl_listener *listener, void *data);
 
-struct wlr_box deco_max_extents(struct view *view);
+struct border deco_max_extents(struct view *view);
 struct wlr_box deco_box(struct view *view, enum deco_part deco_part);
 enum deco_part deco_at(struct view *view, double lx, double ly);
 

src/cursor.c

@@ -30,7 +30,9 @@ static void process_cursor_resize(struct server *server, uint32_t time)
 	double dy = server->cursor->y - server->grab_y;
 
 	struct view *view = server->grabbed_view;
-	struct wlr_box new_view_geo = view_geometry(view);
+	struct wlr_box new_view_geo = {
+		.x = view->x, .y = view->y, .width = view->w, .height = view->h
+	};
 
 	if (server->resize_edges & WLR_EDGE_TOP) {
 		new_view_geo.y = server->grab_box.y + dy;
@@ -53,6 +55,8 @@ static void process_cursor_resize(struct server *server, uint32_t time)
 	view->y = new_view_geo.y;
 
 	/* Resize */
+	new_view_geo.width -= 2 * view->xdg_grab_offset;
+	new_view_geo.height -= 2 * view->xdg_grab_offset;
 	view_resize(view, new_view_geo);
 }
 
@@ -74,8 +78,8 @@ static void process_cursor_motion(struct server *server, uint32_t time)
 	struct wlr_surface *surface = NULL;
 	int view_area;
 	struct view *view = desktop_view_at(server, server->cursor->x,
-				    server->cursor->y, &surface, &sx, &sy,
-				    &view_area);
+					    server->cursor->y, &surface, &sx,
+					    &sy, &view_area);
 	if (!view) {
 		/* If there's no view under the cursor, set the cursor image to
 		 * a default. This is what makes the cursor image appear when
@@ -83,6 +87,8 @@ static void process_cursor_motion(struct server *server, uint32_t time)
 		wlr_xcursor_manager_set_cursor_image(
 			server->cursor_mgr, XCURSOR_DEFAULT, server->cursor);
 	}
+
+	/* TODO: Could we use wlr_xcursor_get_resize_name() here?? */
 	switch (view_area) {
 	case LAB_DECO_PART_TITLE:
 		wlr_xcursor_manager_set_cursor_image(
@@ -189,8 +195,8 @@ void cursor_button(struct wl_listener *listener, void *data)
 	struct wlr_surface *surface;
 	int view_area;
 	struct view *view = desktop_view_at(server, server->cursor->x,
-				    server->cursor->y, &surface, &sx, &sy,
-				    &view_area);
+					    server->cursor->y, &surface, &sx,
+					    &sy, &view_area);
 	if (event->state == WLR_BUTTON_RELEASED) {
 		/* Exit interactive move/resize mode. */
 		server->cursor_mode = LAB_CURSOR_PASSTHROUGH;

src/deco.c

@@ -10,17 +10,17 @@
 #include "common/bug-on.h"
 #include "common/log.h"
 
-#define BORDER_WIDTH (1)
+#define BORDER_WIDTH (2)
 
-struct wlr_box deco_max_extents(struct view *view)
+struct border deco_max_extents(struct view *view)
 {
-	struct wlr_box box = {
-		.x = view->x - BORDER_WIDTH,
-		.y = view->y - rc.title_height - BORDER_WIDTH,
-		.width = view->w + 2 * BORDER_WIDTH,
-		.height = view->h + rc.title_height + 2 * BORDER_WIDTH,
+	struct border border = {
+		.top = rc.title_height + BORDER_WIDTH,
+		.bottom = BORDER_WIDTH,
+		.left = BORDER_WIDTH,
+		.right = BORDER_WIDTH,
 	};
-	return box;
+	return border;
 }
 
 struct wlr_box deco_box(struct view *view, enum deco_part deco_part)

src/desktop.c

@@ -153,11 +153,8 @@ static bool _view_at(struct view *view, double lx, double ly,
 			view->xdg_surface, view_sx, view_sy, &_sx, &_sy);
 		break;
 	case LAB_XWAYLAND_VIEW:
-		if (!view->xwayland_surface->surface)
-			return false;
-		_surface =
-			wlr_surface_surface_at(view->xwayland_surface->surface,
-					       view_sx, view_sy, &_sx, &_sy);
+		_surface = wlr_surface_surface_at(view->surface, view_sx,
+						  view_sy, &_sx, &_sy);
 		break;
 	}
 

src/interactive.c

@@ -14,6 +14,9 @@ void interactive_begin(struct view *view, enum cursor_mode mode, uint32_t edges)
 	/* Remember view and cursor positions at start of move/resize */
 	server->grab_x = server->cursor->x;
 	server->grab_y = server->cursor->y;
-	server->grab_box = view_geometry(view);
+	struct wlr_box box = {
+		.x = view->x, .y = view->y, .width = view->w, .height = view->h
+	};
+	memcpy(&server->grab_box, &box, sizeof(struct wlr_box));
 	server->resize_edges = edges;
 }

src/output.c

@@ -53,14 +53,10 @@ static void render_cycle_box(struct output *output)
 	}
 	return;
 render_it:
-	if ((view->type == LAB_XWAYLAND_VIEW) || !rc.client_side_decorations) {
-		box = deco_max_extents(view);
-	} else {
-		box.x = view->x;
-		box.y = view->y;
-		box.width = view->w;
-		box.height = view->h;
-	}
+	box.x = view->x - view->margin.left;
+	box.y = view->y - view->margin.top;
+	box.width = view->w + view->margin.left + view->margin.right;
+	box.height = view->h + view->margin.top + view->margin.bottom;
 	struct draw_data dd = {
 		.renderer = view->server->renderer,
 		.transform_matrix = output->wlr_output->transform_matrix,

src/view.c

@@ -1,70 +1,13 @@
 #include "labwc.h"
 #include "common/bug-on.h"
 
-void view_init_position(struct view *view)
-{
-	/* If surface already has a 'desired' position, don't touch it */
-	if (view->x || view->y)
-		return;
-
-	/* Do not touch xwayland surfaces like menus and apps like dmenu */
-	if (view->type == LAB_XWAYLAND_VIEW && !view->show_server_side_deco)
-		return;
-
-	struct wlr_box box;
-	if (view->type == LAB_XDG_SHELL_VIEW && !view->show_server_side_deco)
-		/*
-		 * We're here either because rc.xml says yes to CSD or
-		 * because the XDG shell won't allow CSD to be turned off
-		 */
-		wlr_xdg_surface_get_geometry(view->xdg_surface, &box);
-	else
-		box = deco_max_extents(view);
-	view->x -= box.x;
-	view->y -= box.y;
-	if (view->type != LAB_XWAYLAND_VIEW)
-		return;
-	wlr_xwayland_surface_configure(view->xwayland_surface, view->x, view->y,
-				       view->xwayland_surface->width,
-				       view->xwayland_surface->height);
-}
-
-struct wlr_box view_get_surface_geometry(struct view *view)
-{
-	struct wlr_box box = { 0 };
-	switch (view->type) {
-	case LAB_XDG_SHELL_VIEW:
-		wlr_xdg_surface_get_geometry(view->xdg_surface, &box);
-		break;
-	case LAB_XWAYLAND_VIEW:
-		box.width = view->w;
-		box.height = view->h;
-		break;
-	}
-	return box;
-}
-
-/* Get geometry relative to screen */
-struct wlr_box view_geometry(struct view *view)
-{
-	struct wlr_box b = view_get_surface_geometry(view);
-	/* Add XDG view invisible border if it exists */
-	b.width += 2 * b.x;
-	b.height += 2 * b.y;
-	/* Make co-ordinates relative to screen */
-	b.x = view->x;
-	b.y = view->y;
-	return b;
-}
-
 void view_resize(struct view *view, struct wlr_box geo)
 {
-	struct wlr_box border = view_get_surface_geometry(view);
 	struct wlr_box box = {
 		.x = view->x,
 		.y = view->y,
-		.width = geo.width - 2 * border.x,
-		.height = geo.height - 2 * border.y,
+		.width = geo.width,
+		.height = geo.height,
 	};
 	view->impl->configure(view, box);
 }

src/xdg.c

@@ -129,18 +129,41 @@ static void xdg_toplevel_view_close(struct view *view)
 	wlr_xdg_toplevel_send_close(view->xdg_surface);
 }
 
+static struct border xdg_shell_border(struct view *view)
+{
+	struct wlr_box box;
+	wlr_xdg_surface_get_geometry(view->xdg_surface, &box);
+	struct border border = {
+		.top = -box.y,
+		.bottom = -box.y,
+		.left = -box.x,
+		.right = -box.x,
+	};
+	return border;
+}
+
 static void xdg_toplevel_view_map(struct view *view)
 {
 	view->mapped = true;
 	view->surface = view->xdg_surface->surface;
 	if (!view->been_mapped) {
 		view->show_server_side_deco = has_ssd(view);
-		view_init_position(view);
+		if (view->show_server_side_deco) {
+			view->margin = deco_max_extents(view);
+		} else {
+			view->margin = xdg_shell_border(view);
+			view->xdg_grab_offset = -view->margin.left;
+		}
+		/* align to edge of screen */
+		view->x += view->margin.left;
+		view->y += view->margin.top;
 	}
 	view->been_mapped = true;
+
 	wl_signal_add(&view->xdg_surface->surface->events.commit,
 		      &view->commit);
 	view->commit.notify = handle_commit;
+
 	desktop_focus_view(view);
 }
 

src/xwayland.c

@@ -55,12 +55,10 @@ static void _close(struct view *view)
 	wlr_xwayland_surface_close(view->xwayland_surface);
 }
 
-static bool want_ssd(struct view *view)
+static bool want_deco(struct view *view)
 {
-	if (view->xwayland_surface->decorations !=
-	    WLR_XWAYLAND_SURFACE_DECORATIONS_ALL)
-		return false;
-	return true;
+	return view->xwayland_surface->decorations ==
+	       WLR_XWAYLAND_SURFACE_DECORATIONS_ALL;
 }
 
 static void map(struct view *view)
@@ -68,12 +66,20 @@ static void map(struct view *view)
 	view->mapped = true;
 	view->x = view->xwayland_surface->x;
 	view->y = view->xwayland_surface->y;
+	view->w = view->xwayland_surface->width;
+	view->h = view->xwayland_surface->height;
 	view->surface = view->xwayland_surface->surface;
-	if (!view->been_mapped) {
-		view->show_server_side_deco = want_ssd(view);
-		view_init_position(view);
-	}
-	view->been_mapped = true;
+	view->show_server_side_deco = want_deco(view);
+
+	view->margin = deco_max_extents(view);
+
+	/* ensure we're inside screen */
+	view->x += view->margin.left;
+	view->y += view->margin.top;
+	struct wlr_box box = {
+		.x = view->x, .y = view->y, .width = view->w, .height = view->h
+	};
+	view->impl->configure(view, box);
 
 	/* Add commit here, as xwayland map/unmap can change the wlr_surface */
 	wl_signal_add(&view->xwayland_surface->surface->events.commit,