add -c center mode on wayland

client/common/common.c

@@ -192,6 +192,7 @@ usage(FILE *out, const char *name)
           "   (...) At end of help indicates the backend support for option.\n\n"
 
           " -b, --bottom          appears at the bottom of the screen. (wx)\n"
+          " -c, --center          appears at the center of the screen. (w)\n"
           " -f, --grab            show the menu before reading stdin. (wx)\n"
           " -n, --no-overlap      adjust geometry to not overlap with panels. (w)\n"
           " -m, --monitor         index of monitor where menu will appear. (wx)\n"
@@ -244,6 +245,7 @@ do_getopt(struct client *client, int *argc, char **argv[])
         { "filter",      required_argument, 0, 'F' },
         { "wrap",        no_argument,       0, 'w' },
         { "list",        required_argument, 0, 'l' },
+        { "center",      no_argument,       0, 'c' },
         { "prompt",      required_argument, 0, 'p' },
         { "index",       required_argument, 0, 'I' },
         { "prefix",      required_argument, 0, 'P' },
@@ -286,7 +288,7 @@ do_getopt(struct client *client, int *argc, char **argv[])
     for (optind = 0;;) {
         int32_t opt;
 
-        if ((opt = getopt_long(*argc, *argv, "hviwxl:I:p:P:I:bfm:H:n", opts, NULL)) < 0)
+        if ((opt = getopt_long(*argc, *argv, "hviwxcl:I:p:P:I:bfm:H:n", opts, NULL)) < 0)
             break;
 
         switch (opt) {
@@ -309,6 +311,9 @@ do_getopt(struct client *client, int *argc, char **argv[])
             case 'l':
                 client->lines = strtol(optarg, NULL, 10);
                 break;
+            case 'c':
+                client->center = true;
+                break;
             case 'p':
                 client->title = optarg;
                 break;
@@ -433,13 +438,18 @@ menu_with_options(struct client *client)
     bm_menu_set_filter_mode(menu, client->filter_mode);
     bm_menu_set_lines(menu, client->lines);
     bm_menu_set_wrap(menu, client->wrap);
-    bm_menu_set_bottom(menu, client->bottom);
     bm_menu_set_monitor(menu, client->monitor);
     bm_menu_set_monitor_name(menu, client->monitor_name);
     bm_menu_set_scrollbar(menu, client->scrollbar);
     bm_menu_set_panel_overlap(menu, !client->no_overlap);
     bm_menu_set_password(menu, client->password);
 
+    if (client->center) {
+        bm_menu_set_center(menu, client->center);
+    } else if (client->bottom) {
+        bm_menu_set_bottom(menu, client->bottom);
+    }
+
     for (uint32_t i = 0; i < BM_COLOR_LAST; ++i)
         bm_menu_set_color(menu, i, client->colors[i]);
 

client/common/common.h

@@ -17,6 +17,7 @@ struct client {
     uint32_t selected;
     uint32_t monitor;
     bool bottom;
+    bool center;
     bool grab;
     bool wrap;
     bool ifne;

lib/bemenu.h

@@ -483,6 +483,15 @@ BM_PUBLIC void bm_menu_set_scrollbar(struct bm_menu *menu, enum bm_scrollbar_mod
  */
 BM_PUBLIC enum bm_scrollbar_mode bm_menu_get_scrollbar(struct bm_menu *menu);
 
+/**
+ * Display menu at center of the screen.
+ * This may be no-op on some renderers (curses, wayland)
+ *
+ * @param menu bm_menu instance to set center mode for.
+ * @param center true for center mode, false for top mode.
+ */
+BM_PUBLIC void bm_menu_set_center(struct bm_menu *menu, bool center);
+
 /**
  * Display menu at bottom of the screen.
  * This may be no-op on some renderers (curses, wayland)

lib/internal.h

@@ -79,6 +79,11 @@ struct render_api {
      */
     void (*set_bottom)(const struct bm_menu *menu, bool bottom);
 
+    /**
+     * Set menu to appear from center of the screen.
+     */
+    void (*set_center)(const struct bm_menu *menu, bool center);
+
     /**
      * Set monitor indeax where menu will appear
      */
@@ -311,6 +316,11 @@ struct bm_menu {
      */
     bool wrap;
 
+    /**
+     * Is menu shown from center?
+     */
+    bool center;
+
     /**
      * Is menu shown from bottom?
      */

lib/menu.c

@@ -340,6 +340,20 @@ bm_menu_get_scrollbar(struct bm_menu *menu)
     return menu->scrollbar;
 }
 
+void
+bm_menu_set_center(struct bm_menu *menu, bool center)
+{
+    assert(menu);
+
+    if (menu->center == center)
+        return;
+
+    menu->center = center;
+
+    if (menu->renderer->api.set_center)
+        menu->renderer->api.set_center(menu, center);
+}
+
 void
 bm_menu_set_bottom(struct bm_menu *menu, bool bottom)
 {

lib/renderers/wayland/wayland.c

@@ -240,6 +240,18 @@ set_bottom(const struct bm_menu *menu, bool bottom)
     }
 }
 
+static void
+set_center(const struct bm_menu *menu, bool center)
+{
+    struct wayland *wayland = menu->renderer->internal;
+    assert(wayland);
+
+    struct window *window;
+    wl_list_for_each(window, &wayland->windows, link) {
+        bm_wl_window_set_center(window, wayland->display, center);
+    }
+}
+
 static void
 grab_keyboard(const struct bm_menu *menu, bool grab)
 {
@@ -432,6 +444,7 @@ register_renderer(struct render_api *api)
     api->get_displayed_count = get_displayed_count;
     api->poll_key = poll_key;
     api->render = render;
+    api->set_center = set_center;
     api->set_bottom = set_bottom;
     api->grab_keyboard = grab_keyboard;
     api->set_overlap = set_overlap;

lib/renderers/wayland/wayland.h

@@ -88,6 +88,7 @@ struct window {
     uint32_t displayed;
     struct wl_list link;
     bool bottom;
+    bool center;
     bool render_pending;
 
     struct {
@@ -129,6 +130,7 @@ void bm_wl_registry_destroy(struct wayland *wayland);
 void bm_wl_window_schedule_render(struct window *window);
 void bm_wl_window_render(struct window *window, struct wl_display *display, const struct bm_menu *menu);
 void bm_wl_window_set_bottom(struct window *window, struct wl_display *display, bool bottom);
+void bm_wl_window_set_center(struct window *window, struct wl_display *display, bool center);
 void bm_wl_window_grab_keyboard(struct window *window, struct wl_display *display, bool grab);
 void bm_wl_window_set_overlap(struct window *window, struct wl_display *display, bool overlap);
 bool bm_wl_window_create(struct window *window, struct wl_display *display, struct wl_shm *shm, struct wl_output *output, struct zwlr_layer_shell_v1 *layer_shell, struct wl_surface *surface);

lib/renderers/wayland/window.c

@@ -240,7 +240,7 @@ bm_wl_window_render(struct window *window, struct wl_display *display, const str
             break;
 
         window->height = result.height / window->scale;
-        zwlr_layer_surface_v1_set_size(window->layer_surface, 0, window->height);
+        zwlr_layer_surface_v1_set_size(window->layer_surface, window->width, window->height);
         wl_surface_commit(window->surface);
         wl_display_roundtrip(display);
         destroy_buffer(buffer);
@@ -304,6 +304,20 @@ bm_wl_window_set_bottom(struct window *window, struct wl_display *display, bool
     wl_display_roundtrip(display);
 }
 
+void
+bm_wl_window_set_center(struct window *window, struct wl_display *display, bool center)
+{
+    if (window->center == center)
+        return;
+
+    window->center = center;
+
+    zwlr_layer_surface_v1_set_anchor(window->layer_surface, ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM | ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP | ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT | ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT);
+    zwlr_layer_surface_v1_set_size(window->layer_surface, 3 * window->width / 4, window->height);
+    wl_surface_commit(window->surface);
+    wl_display_roundtrip(display);
+}
+
 void
 bm_wl_window_grab_keyboard(struct window *window, struct wl_display *display, bool grab)
 {