[gnome-shell] loginDialog: Move long session-list menus to the side

[Florian Müllner <fmuellner src gnome org>]

commit 9934529a0b67ed1d1e8506b9e2af29609b20b7a6
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Mar 20 14:29:40 2015 +0100

    loginDialog: Move long session-list menus to the side
    
    Currently the menu position below the button means that the menu
    can extend to roughly half the screen height before ending up partly
    off-screen. This is plenty of space for commonly installed sessions,
    but some users have a significantly higher number of sessions in the
    list. Move the menu to the side of the button in that case to maximize
    the vertical space the menu may take up.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=734352

 js/gdm/loginDialog.js |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/js/gdm/loginDialog.js b/js/gdm/loginDialog.js
index 8da1b55..eed43d7 100644
--- a/js/gdm/loginDialog.js
+++ b/js/gdm/loginDialog.js
@@ -49,6 +49,7 @@ const _FADE_ANIMATION_TIME = 0.25;
 const _SCROLL_ANIMATION_TIME = 0.5;
 const _TIMED_LOGIN_IDLE_THRESHOLD = 5.0;
 const _LOGO_ICON_HEIGHT = 48;
+const _MAX_BOTTOM_MENU_ITEMS = 5;
 
 const UserListItem = new Lang.Class({
     Name: 'UserListItem',
@@ -283,7 +284,16 @@ const SessionMenuButton = new Lang.Class({
 
         this.actor = new St.Bin({ child: this._button });
 
-        this._menu = new PopupMenu.PopupMenu(this._button, 0, St.Side.TOP);
+        let side = St.Side.TOP;
+        let align = 0;
+        if (Gdm.get_session_ids().length > _MAX_BOTTOM_MENU_ITEMS) {
+            if (this.actor.text_direction == Clutter.TextDirection.RTL)
+                side = St.Side.RIGHT;
+            else
+                side = St.Side.LEFT;
+            align = 0.5;
+        }
+        this._menu = new PopupMenu.PopupMenu(this._button, align, side);
         Main.uiGroup.add_actor(this._menu.actor);
         this._menu.actor.hide();