Adds buttons to scroll the tabs when they overflow.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3174 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/common/_tabs.rhtml

@@ -9,8 +9,17 @@
                                     :onclick => "showTab('#{tab[:name]}'); this.blur(); return false;" %></li>
   <% end -%>
   </ul>
+  <div class="tabs-buttons" style="display:none;">
+  	<button class="tab-left" onclick="moveTabLeft(this);"></button>
+  	<button class="tab-right" onclick="moveTabRight(this);"></button>
+  </div>
 </div>
 
+<script>
+	Event.observe(window, 'load', function() { displayTabsButtons(); });
+	Event.observe(window, 'resize', function() { displayTabsButtons(); }); 
+</script>
+
 <% tabs.each do |tab| -%>
   <%= content_tag('div', render(:partial => tab[:partial], :locals => {:tab => tab} ), 
                        :id => "tab-content-#{tab[:name]}",

public/javascripts/application.js

@@ -73,6 +73,55 @@ function showTab(name) {
 	return false;
 }
 
+function moveTabRight(el) {
+	var lis = Element.up(el, 'div.tabs').down('ul').childElements();
+	var tabsWidth = 0;
+	var i;
+	for (i=0; i<lis.length; i++) {
+		if (lis[i].visible()) {
+			tabsWidth += lis[i].getWidth() + 6;
+		}
+	}
+	if (tabsWidth < Element.up(el, 'div.tabs').getWidth() - 60) {
+		return;
+	}
+	i=0;
+	while (i<lis.length && !lis[i].visible()) {
+		i++;
+	}
+	lis[i].hide();
+}
+
+function moveTabLeft(el) {
+	var lis = Element.up(el, 'div.tabs').down('ul').childElements();
+	var i = 0;
+	while (i<lis.length && !lis[i].visible()) {
+		i++;
+	}
+	if (i>0) {
+		lis[i-1].show();
+	}
+}
+
+function displayTabsButtons() {
+	var lis;
+	var tabsWidth = 0;
+	var i;
+	$$('div.tabs').each(function(el) {
+		lis = el.down('ul').childElements();
+		for (i=0; i<lis.length; i++) {
+			if (lis[i].visible()) {
+				tabsWidth += lis[i].getWidth() + 6;
+			}
+		}
+		if (tabsWidth < el.getWidth() - 60) {
+			el.down('div.tabs-buttons').hide();
+		} else {
+			el.down('div.tabs-buttons').show();
+		}
+	});
+}
+
 function setPredecessorFieldsVisibility() {
     relationType = $('relation_relation_type');
     if (relationType && relationType.value == "precedes") {

public/stylesheets/application.css

@@ -486,8 +486,8 @@ p.pourcent {font-size: 80%;}
 p.progress-info {clear: left; font-style: italic; font-size: 80%;}
 
 /***** Tabs *****/
-#content .tabs {height: 2.6em; border-bottom: 1px solid #bbbbbb; margin-bottom:1.2em; position:relative;}
-#content .tabs ul {margin:0; position:absolute; bottom:-2px; padding-left:1em;}
+#content .tabs {height: 2.6em; border-bottom: 1px solid #bbbbbb; margin-bottom:1.2em; position:relative; overflow:hidden;}
+#content .tabs ul {margin:0; position:absolute; bottom:-2px; padding-left:1em; width: 2000px;}
 #content .tabs>ul { bottom:-1px; } /* others */
 #content .tabs ul li {
 float:left;
@@ -524,6 +524,31 @@ border-bottom: 1px solid #fff;
 background-color: #fff;
 }
 
+div.tabs-buttons { position:absolute; right: 0; width: 48px; height: 24px; background: white; bottom: -1px;  }
+
+button.tab-left, button.tab-right {
+	font-size: 0.9em;
+	cursor: pointer;
+	height:24px;
+	border: 1px solid #ccc;
+	border-bottom: 1px solid #bbbbbb;
+	position:absolute;
+	padding:4px;
+	width: 20px;
+}
+
+button.tab-left {
+	right: 20px;
+	bottom: 0;
+	background: #eeeeee url(../images/bullet_arrow_left.png) no-repeat 50% 50%;
+}
+
+button.tab-right {
+	right: 0;
+	bottom: 0;
+	background: #eeeeee url(../images/bullet_arrow_right.png) no-repeat 50% 50%;}
+}
+
 /***** Auto-complete *****/
 div.autocomplete {
   position:absolute;