improve UserView GUI (sensitive buttons)

www/manager/dc/UserView.js

@@ -23,36 +23,9 @@ Ext.define('PVE.dc.UserView', {
 	    store.load();
 	};
 
-        var tbar = [
-            {
-		text: 'Create',
-		handler: function() {
-                    var win = Ext.create('PVE.dc.UserEdit',{
-                    });
-                    win.on('destroy', reload);
-                    win.show();
-		}
-            },
-            {
-		text: 'Modify',
-		handler: function() {
-		    var sm = me.getSelectionModel();
-		    var rec = sm.getSelection()[0];
-		    if (!rec) {
-			return;
-		    }
-
-		    var userid = rec.data.userid;
-
-                    var win = Ext.create('PVE.dc.UserEdit',{
-                        userid: userid
-                    });
-                    win.on('destroy', reload);
-                    win.show();
-		}
-            },
-            {
+ 	var remove_btn = new Ext.Button({
 	    text: 'Delete',
+	    disabled: true,
 	    handler: function() {
 		var msg;
 		var sm = me.getSelectionModel();
@@ -63,7 +36,6 @@ Ext.define('PVE.dc.UserView', {
 
 		var userid = rec.data.userid;
 
-		    if (userid !== 'root@pam') {
 		msg = 'Are you sure you want to permanently delete the user: ' + userid;
 		Ext.Msg.confirm('Deletion Confirmation', msg, function(btn) {
 		    if (btn !== 'yes') {
@@ -82,12 +54,55 @@ Ext.define('PVE.dc.UserView', {
 			}
 		    });
 		});
-		    } else {
-			msg = 'You are not permitted to delete the user: root@pam';
-			Ext.Msg.alert('Error', msg);
 	    }
+        });
+ 
+	var run_editor = function() {
+	    var sm = me.getSelectionModel();
+	    var rec = sm.getSelection()[0];
+	    if (!rec) {
+		return;
 	    }
+
+            var win = Ext.create('PVE.dc.UserEdit',{
+                userid: rec.data.userid
+            });
+            win.on('destroy', reload);
+            win.show();
+	};
+
+	var edit_btn = new Ext.Button({
+	    text: 'Modify',
+	    disabled: true,
+	    handler: run_editor
+	});
+
+	var set_button_status = function() {
+	    var sm = me.getSelectionModel();
+	    var rec = sm.getSelection()[0];
+
+	    if (!rec) {
+		remove_btn.disable();
+		edit_btn.disable();
+		return;
 	    }
+
+	    edit_btn.setDisabled(false);
+
+	    remove_btn.setDisabled(rec.data.userid === 'root@pam');
+	};
+
+        var tbar = [
+            {
+		text: 'Create',
+		handler: function() {
+                    var win = Ext.create('PVE.dc.UserEdit',{
+                    });
+                    win.on('destroy', reload);
+                    win.show();
+		}
+            },
+  	    edit_btn, remove_btn
         ];
 	   
 	var render_expire = function(date) {
@@ -165,7 +180,9 @@ Ext.define('PVE.dc.UserView', {
 		}
 	    ],
 	    listeners: {
-		show: reload
+		show: reload,
+		itemdblclick: run_editor,
+		selectionchange: set_button_status
 	    }
 	});