userWidget: Allow vertical orientation for user avatars

Allow vertical orientation for the userWidget so that the user-avatar
can be centered and user's name can be placed below it. The plan
for 3.36 is to use this vertical userWidget layout for both lock
and login screen.

The userWidget is also used while creating the user-selection list
at the login, hence we still need to keep the horizontal layout
for userWidget in place.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/922

data/theme/gnome-shell-sass/widgets/_login-dialog.scss

@@ -113,20 +113,27 @@
   &:focus .login-dialog-timed-login-indicator { background-color: $selected_fg_color; }
 }
 
-.login-dialog-username,
 .user-widget-label {
   color: $osd_fg_color;
+}
+
+.user-widget.horizontal .user-widget-label {
   @include fontsize($base_font_size + 2);
   font-weight: bold;
   text-align: left;
   padding-left: 15px;
-}
 
-.user-widget-label {
   &:ltr { padding-left: 14px; }
   &:rtl { padding-right: 14px; }
 }
 
+.user-widget.vertical .user-widget-label {
+  @include fontsize($base_font_size + 5);
+  text-align: center;
+  font-weight: normal;
+  padding-top: 16px;
+}
+
 .login-dialog-prompt-layout {
   padding-top: 24px;
   padding-bottom: 12px;

data/theme/gnome-shell-sass/widgets/_misc.scss

@@ -37,6 +37,14 @@
   }
 }
 
+.user-widget.vertical .user-icon {
+  icon-size: 128px;
+}
+
+.user-widget.horizontal .user-icon {
+  icon-size: 64px;
+}
+
 // Input Source Switcher
 .input-source-switcher-symbol {
   font-size: 34pt;

js/gdm/authPrompt.js

@@ -47,6 +47,8 @@ var AuthPrompt = GObject.registerClass({
         super._init({
             style_class: 'login-dialog-prompt-layout',
             vertical: true,
+            x_expand: true,
+            x_align: Clutter.ActorAlign.CENTER,
         });
 
         this.verificationStatus = AuthPromptStatus.NOT_VERIFYING;
@@ -455,8 +457,7 @@ var AuthPrompt = GObject.registerClass({
             oldChild.destroy();
 
         if (user) {
-            let userWidget = new UserWidget.UserWidget(user);
+            let userWidget = new UserWidget.UserWidget(user, Clutter.Orientation.VERTICAL);
-            userWidget.x_align = Clutter.ActorAlign.START;
             this._userWell.set_child(userWidget);
         }
     }

js/ui/userWidget.js

@@ -7,6 +7,7 @@ const { Clutter, GLib, GObject, St } = imports.gi;
 
 const Params = imports.misc.params;
 
+const UNKNOWN_AVATAR_ICON_SIZE = -1;
 var AVATAR_ICON_SIZE = 64;
 
 // Adapted from gdm/gui/user-switch-applet/applet.c
@@ -18,9 +19,11 @@ var Avatar = GObject.registerClass(
 class Avatar extends St.Bin {
     _init(user, params) {
         let themeContext = St.ThemeContext.get_for_stage(global.stage);
-        params = Params.parse(params, { reactive: false,
+        params = Params.parse(params, {
-                                        iconSize: AVATAR_ICON_SIZE,
+            styleClass: 'user-icon',
-                                        styleClass: 'user-icon' });
+            reactive: false,
+            iconSize: UNKNOWN_AVATAR_ICON_SIZE,
+        });
 
         super._init({
             style_class: params.styleClass,
@@ -44,6 +47,23 @@ class Avatar extends St.Bin {
         this.connect('destroy', this._onDestroy.bind(this));
     }
 
+    vfunc_style_changed() {
+        super.vfunc_style_changed();
+
+        let node = this.get_theme_node();
+        let [found, iconSize] = node.lookup_length('icon-size', false);
+
+        if (!found)
+            return;
+
+        let themeContext = St.ThemeContext.get_for_stage(global.stage);
+
+        // node.lookup_length() returns a scaled value, but we
+        // need unscaled
+        this._iconSize = iconSize / themeContext.scaleFactor;
+        this.update();
+    }
+
     _onDestroy() {
         if (this._scaleFactorChangeId) {
             let themeContext = St.ThemeContext.get_for_stage(global.stage);
@@ -52,28 +72,40 @@ class Avatar extends St.Bin {
         }
     }
 
+    _getIconSize() {
+        if (this._iconSize !== UNKNOWN_AVATAR_ICON_SIZE)
+            return this._iconSize;
+        else
+            return AVATAR_ICON_SIZE;
+    }
+
     setSensitive(sensitive) {
         this.reactive = sensitive;
     }
 
     update() {
+        let iconSize = this._getIconSize();
+
         let iconFile = this._user.get_icon_file();
         if (iconFile && !GLib.file_test(iconFile, GLib.FileTest.EXISTS))
             iconFile = null;
 
         if (iconFile) {
             this.child = null;
+
             let { scaleFactor } = St.ThemeContext.get_for_stage(global.stage);
             this.set_size(
-                this._iconSize * scaleFactor,
+                iconSize * scaleFactor,
-                this._iconSize * scaleFactor);
+                iconSize * scaleFactor);
             this.style = `
                 background-image: url("${iconFile}");
                 background-size: cover;`;
         } else {
             this.style = null;
-            this.child = new St.Icon({ icon_name: 'avatar-default-symbolic',
+            this.child = new St.Icon({
-                                       icon_size: this._iconSize });
+                icon_name: 'avatar-default-symbolic',
+                icon_size: iconSize,
+            });
         }
     }
 });
@@ -159,14 +191,23 @@ class UserWidgetLabel extends St.Widget {
 
 var UserWidget = GObject.registerClass(
 class UserWidget extends St.BoxLayout {
-    _init(user) {
+    _init(user, orientation = Clutter.Orientation.HORIZONTAL) {
-        super._init({ style_class: 'user-widget', vertical: false });
-
         this._user = user;
 
+        let vertical = orientation == Clutter.Orientation.VERTICAL;
+        let xAlign = vertical ? Clutter.ActorAlign.CENTER : Clutter.ActorAlign.START;
+        let styleClass = vertical ? 'user-widget vertical' : 'user-widget horizontal';
+
+        super._init({
+            styleClass,
+            vertical,
+            xAlign,
+        });
+
         this.connect('destroy', this._onDestroy.bind(this));
 
         this._avatar = new Avatar(user);
+        this._avatar.x_align = Clutter.ActorAlign.CENTER;
         this.add_child(this._avatar);
 
         this._label = new UserWidgetLabel(user);