Display the context menu above and/or to the left of the click if needed (patch by Mike Duchene, closes #960).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1323 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/javascripts/context_menu.js

@@ -93,14 +93,55 @@ ContextMenu.prototype = {
   },
   
   showMenu: function(e) {
-		$('context-menu').style['left'] = (Event.pointerX(e) + 'px');
+    var mouse_x = Event.pointerX(e);
-		$('context-menu').style['top'] = (Event.pointerY(e) + 'px');		
+    var mouse_y = Event.pointerY(e);
+    var render_x = mouse_x;
+    var render_y = mouse_y;
+    var dims;
+    var menu_width;
+    var menu_height;
+    var window_width;
+    var window_height;
+    var max_width;
+    var max_height;
+
+    $('context-menu').style['left'] = (render_x + 'px');
+    $('context-menu').style['top'] = (render_y + 'px');		
     Element.update('context-menu', '');
+
     new Ajax.Updater({success:'context-menu'}, this.url, 
       {asynchronous:true,
        evalScripts:true,
        parameters:Form.serialize(Event.findElement(e, 'form')),
        onComplete:function(request){
+				 dims = $('context-menu').getDimensions();
+				 menu_width = dims.width;
+				 menu_height = dims.height;
+				 max_width = mouse_x + 2*menu_width;
+				 max_height = mouse_y + menu_height;
+			
+				 var ws = window_size();
+				 window_width = ws.width;
+				 window_height = ws.height;
+			
+				 /* display the menu above and/or to the left of the click if needed */
+				 if (max_width > window_width) {
+				   render_x -= menu_width;
+				   $('context-menu').addClassName('reverse-x');
+				 } else {
+					 $('context-menu').removeClassName('reverse-x');
+				 }
+				 if (max_height > window_height) {
+				   render_y -= menu_height;
+				   $('context-menu').addClassName('reverse-y');
+				 } else {
+					 $('context-menu').removeClassName('reverse-y');
+				 }
+				 if (render_x <= 0) render_x = 1;
+				 if (render_y <= 0) render_y = 1;
+				 $('context-menu').style['left'] = (render_x + 'px');
+				 $('context-menu').style['top'] = (render_y + 'px');
+				 
          Effect.Appear('context-menu', {duration: 0.20});
          if (window.parseStylesheets) { window.parseStylesheets(); } // IE
       }})
@@ -159,3 +200,19 @@ function toggleIssuesSelection(el) {
 		}
 	}
 }
+
+function window_size() {
+    var w;
+    var h;
+    if (window.innerWidth) {
+	w = window.innerWidth;
+	h = window.innerHeight;
+    } else if (document.documentElement) {
+	w = document.documentElement.clientWidth;
+	h = document.documentElement.clientHeight;
+    } else {
+	w = document.body.clientWidth;
+	h = document.body.clientHeight;
+    }
+    return {width: w, height: h};
+}

public/stylesheets/context_menu.css

@@ -22,13 +22,13 @@
 	padding:1px;
 	z-index:9;
 }
-#context-menu li.folder ul {
+#context-menu li.folder ul { position:absolute; left:168px; /* IE6 */ top:-2px; }
-	position:absolute;
-	left:168px; /* IE6 */
-	top:-2px;
-}
 #context-menu li.folder>ul { left:148px; }
 
+#context-menu.reverse-y li.folder>ul { top:auto; bottom:0; }
+#context-menu.reverse-x li.folder ul { left:auto; right:168px; /* IE6 */ }
+#context-menu.reverse-x li.folder>ul { right:148px; }
+
 #context-menu a {
 	border:1px solid white;
 	text-decoration:none;