[Next] menu: Add placeholders for empty categories

data/theme/cinnamon-sass/widgets/_base.scss

@@ -50,6 +50,25 @@
   -pie-background-color: rgba(140, 140, 140, 0.6);
 }
 
+// placeholder
+
+.placeholder {
+  spacing: 8px;
+  padding: $base_padding * 2;
+
+  .placeholder-icon { color: $insensitive_fg_color; }
+  .placeholder-label {
+    @extend %title_3;
+    color: $insensitive_fg_color;
+    padding-top: 8px;
+  }
+
+  .placeholder-description {
+    color: $insensitive_fg_color;
+    text-align: center;
+  }
+}
+
 // ripples
 
 .ripple-pointer-location {

files/usr/share/cinnamon/applets/menu@cinnamon.org/applet.js

@@ -26,6 +26,7 @@ const Pango = imports.gi.Pango;
 const SearchProviderManager = imports.ui.searchProviderManager;
 const SignalManager = imports.misc.signalManager;
 const Params = imports.misc.params;
+const Placeholder = imports.ui.placeholder;
 
 const INITIAL_BUTTON_LOAD = 30;
 
@@ -2236,14 +2237,16 @@ class CinnamonMenuApplet extends Applet.TextIconApplet {
             button.actor.visible = this.menu.isOpen && this.lastSelectedCategory === "recent";
         } else {
             this.noRecentDocuments = true;
-            let button = new SimpleMenuItem(this, { name: _("No recent documents"),
-                                                    type: 'no-recent',
-                                                    styleClass: 'appmenu-application-button',
-                                                    reactive: false,
-                                                    activatable: false });
-            button.addLabel(button.name, 'appmenu-application-button-label');
+            let button = new SimpleMenuItem(this, { type: 'no-recent' });
+            let placeHolder = new Placeholder.Placeholder({
+                icon_name: 'xsi-document-open-recent-symbolic',
+                title: _('No Recent Documents'),
+            });
+            button.actor.y_expand = true;
+            button.actor.y_align = Clutter.ActorAlign.CENTER;
+            button.actor.add_child(placeHolder);
             this._recentButtons.push(button);
-            this.applicationsBox.add_actor(button.actor);
+            this.applicationsBox.add_child(button.actor);
             button.actor.visible = this.menu.isOpen && this.lastSelectedCategory === "recent";
         }
     }
@@ -2284,14 +2287,17 @@ class CinnamonMenuApplet extends Applet.TextIconApplet {
             });
         }
         else {
-            let button = new SimpleMenuItem(this, { name: _("No favorite documents"),
-                                                    type: 'no-favorites',
-                                                    styleClass: 'appmenu-application-button',
-                                                    reactive: false,
-                                                    activatable: false });
-            button.addLabel(button.name, 'appmenu-application-button-label');
+            let button = new SimpleMenuItem(this, { type: 'no-favorites' });
+            let placeHolder = new Placeholder.Placeholder({
+                icon_name: 'xsi-user-favorites-symbolic',
+                title: _('No Favorite Documents'),
+                description: _("Files you add to Favorites in your file manager will be shown here")
+            });
+            button.actor.y_expand = true;
+            button.actor.y_align = Clutter.ActorAlign.CENTER;
+            button.actor.add_child(placeHolder);
             this._favoriteDocButtons.push(button);
-            this.applicationsBox.add_actor(button.actor);
+            this.applicationsBox.add_child(button.actor);
             button.actor.visible = this.menu.isOpen && this.lastSelectedCategory === "favorite";
         }
     }

js/ui/placeholder.js

@@ -0,0 +1,98 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+
+const { Clutter, GObject, Pango, St } = imports.gi;
+
+var Placeholder = GObject.registerClass({
+    Properties: {
+        'icon-name': GObject.ParamSpec.string(
+            'icon-name', null, null,
+            GObject.ParamFlags.READWRITE |
+            GObject.ParamFlags.CONSTRUCT,
+            null),
+        'title': GObject.ParamSpec.string(
+            'title', null, null,
+            GObject.ParamFlags.READWRITE |
+            GObject.ParamFlags.CONSTRUCT,
+            null),
+        'description': GObject.ParamSpec.string(
+            'description', null, null,
+            GObject.ParamFlags.READWRITE |
+            GObject.ParamFlags.CONSTRUCT,
+            null),
+    },
+}, class Placeholder extends St.BoxLayout {
+    _init(params) {
+        this._icon = new St.Icon({
+            style_class: 'placeholder-icon',
+            icon_size: 64,
+            icon_type: St.IconType.SYMBOLIC,
+            x_align: Clutter.ActorAlign.CENTER,
+        });
+
+        this._title = new St.Label({
+            style_class: 'placeholder-label',
+            x_align: Clutter.ActorAlign.CENTER,
+        });
+
+        this._description = new St.Label({
+            style_class: 'placeholder-description',
+            x_align: Clutter.ActorAlign.CENTER,
+        });
+        this._description.clutter_text.ellipsize = Pango.EllipsizeMode.NONE;
+        this._description.clutter_text.line_wrap = true;
+
+        super._init({
+            style_class: 'placeholder',
+            reactive: false,
+            vertical: true,
+            x_expand: true,
+            y_expand: true,
+            ...params,
+        });
+
+        this.add_child(this._icon);
+        this.add_child(this._title);
+        this.add_child(this._description);
+    }
+
+    get icon_name() {
+        return this._icon.icon_name;
+    }
+
+    set icon_name(iconName) {
+        if (this._icon.icon_name === iconName)
+            return;
+
+        this._icon.icon_name = iconName;
+        this.notify('icon-name');
+    }
+
+    get title() {
+        return this._title.text;
+    }
+
+    set title(title) {
+        if (this._title.text === title)
+            return;
+
+        this._title.text = title;
+        this.notify('title');
+    }
+
+    get description() {
+        return this._description.text;
+    }
+
+    set description(description) {
+        if (this._description.text === description)
+            return;
+
+        if (description === null)
+            this._description.visible = false;
+        else
+            this._description.visible = true;
+
+        this._description.text = description;
+        this.notify('description');
+    }
+});