Here's a pretty simple patch for doing the drag over a folder thing.

The other thing it does is keeps track of whether the "folder" portion
of the screen or the "mail" portion of the screen has the "focus" and
changes the color accordingly.

For example if you've clicked on the Inbox folder, the folder will be
colored red.  If you then select a message, the Inbox folder will now be
highlighted in grey and the message you've selected will be red.  If you
click back on to the Inbox folder, the message you've selected will turn
grey and "Inbox" will turn back red.

If you go back to the message list, select a message and drag it over
the folder list, the folder's will turn red as your mouse hovers over
them.

I've tested this a little, but of course it could always use more
testing.  Please let me know your thoughts on this patch.


-Charles

  

Index: program/js/app.js
===================================================================
--- program/js/app.js	(revision 274)
+++ program/js/app.js	(working copy)
@@ -244,7 +244,6 @@
     // load body click event
     document.onmousedown = function(){ return rcube_webmail_client.reset_click(); };
     document.onkeydown   = function(e){ return rcube_webmail_client.key_pressed(e, msg_list_frame); };
-
     
     // flag object as complete
     this.loaded = true;
@@ -285,6 +284,14 @@
 	  }
     }
 
+    if (this.gui_objects.mailboxlist) {
+      var s_mbox = String(this.env.mailbox).toLowerCase().replace(this.mbox_expression, '');
+      var mbox_li = document.getElementById('rcmbx'+s_mbox);
+      
+      if (mbox_li) 
+        this.set_classname(mbox_li, 'unfocused', true);
+    }
+    
     this.in_message_list = true;
     e.cancelBubble = true;
     };
@@ -1161,9 +1168,10 @@
   // onmouseup handler for mailboxlist item
   this.mbox_mouse_up = function(mbox)
     {
-    if (this.drag_active)
+    if (this.drag_active){
+      this.unfocus_mailbox(mbox);
       this.command('moveto', mbox);
-    else
+    } else
       this.command('list', mbox);
       
     return false;
@@ -1529,8 +1537,7 @@
     if (this.env.search_request)
       add_url += '&_search='+this.env.search_request;
       
-    if (this.env.mailbox!=mbox)
-      this.select_mailbox(mbox);
+    this.select_mailbox(mbox);
 
     // load message list remotely
     if (this.gui_objects.messagelist)
@@ -1634,7 +1641,26 @@
     return true;
     };
     
-
+  this.focus_mailbox = function(mbox) {
+  	if (this.gui_objects.mailboxlist && this.drag_active) {
+      var s_mbox = String(mbox).toLowerCase().replace(this.mbox_expression, '');
+      var mbox_li = document.getElementById('rcmbx'+s_mbox);
+      
+      if (mbox_li) 
+        this.set_classname(mbox_li, 'selected', true);
+    }
+  }
+    
+  this.unfocus_mailbox = function(mbox) {
+  	if (this.gui_objects.mailboxlist && this.drag_active) {
+      var s_mbox = String(mbox).toLowerCase().replace(this.mbox_expression, '');
+      var mbox_li = document.getElementById('rcmbx'+s_mbox);
+      
+      if (mbox_li)
+        this.set_classname(mbox_li, 'selected', false);
+    }
+  }
+  
   // move selected messages to the specified mailbox
   this.move_messages = function(mbox)
     {
@@ -2199,7 +2225,6 @@
           highlight.removeAttribute('id');
           //highlight.removeAttribute('class');
           this.set_classname(highlight, 'selected', false);
-          this.set_classname(highlight, 'unfocused', false);
           }
 
         if (next)
@@ -2990,7 +3015,7 @@
   // mark a mailbox as selected and set environment variable
   this.select_mailbox = function(mbox)
     {
-    if (this.gui_objects.mailboxlist)
+    if (this.gui_objects.mailboxlist )
       {
       var item, reg, text_obj;
       var s_current = this.env.mailbox.toLowerCase().replace(this.mbox_expression, '');
@@ -3003,8 +3028,10 @@
       if (current_li) {
         this.set_classname(current_li, 'selected', false);
         this.set_classname(current_li, 'unfocused', false);
-        }
-      if (mbox_li)
+      }
+
+      if (mbox_li || this.env.mailbox == mbox)
+        this.set_classname(mbox_li, 'unfocused', false);
         this.set_classname(mbox_li, 'selected', true);
       }
     
Index: program/steps/mail/func.inc
===================================================================
--- program/steps/mail/func.inc	(revision 274)
+++ program/steps/mail/func.inc	(working copy)
@@ -216,6 +216,8 @@
 
     $out .= sprintf('<li id="rcmbx%s" class="mailbox %s %s%s%s"><a href="%s&_mbox=%s"'.
                     ' onclick="return %s.command(\'list\',\'%s\')"'.
+                    ' onmouseover="return %s.focus_mailbox(\'%s\')"' .            
+                    ' onmouseout="return %s.unfocus_mailbox(\'%s\')"' .
                     ' onmouseup="return %s.mbox_mouse_up(\'%s\')"%s>%s</a>',
                     $folder_css,
                     $class_name,
@@ -227,7 +229,12 @@
                     $JS_OBJECT_NAME,
                     addslashes($folder['id']),
                     $JS_OBJECT_NAME,
+                    addslashes($folder['id']),               
+                    $JS_OBJECT_NAME,
+                    addslashes($folder['id']),              
+                    $JS_OBJECT_NAME,
                     addslashes($folder['id']),
+
                     $title,
                     rep_specialchars_output($foldername, 'html', 'all'));
 
Index: skins/default/mail.css
===================================================================
--- skins/default/mail.css	(revision 274)
+++ skins/default/mail.css	(working copy)
@@ -266,7 +266,7 @@
 
 #mailboxlist li.selected
 {
-  background-color: #929292;
+  background-color: #CC3333;
   border-bottom: 1px solid #898989;
 }
 
@@ -276,7 +276,18 @@
   font-weight: bold;
 }
 
+#mailboxlist li.unfocused
+{
+  background-color: #929292;
+  border-bottom: 1px solid #898989;
+}
 
+#mailboxlist li.unfocused a
+{
+  color: #FFF;
+  font-weight: bold;
+}
+
 /* styles for nested folders */
 #mailboxlist ul {
   list-style: none;