Adapting Pager shape in Admin to handle huge number of items

- Displaying a window of pages
- Adding First and Last page links

--HG--
branch : dev
extra : transplant_source : %F5%ED%A3%92%40k%AE%E9%87%9Cs%28HF%83%9FM%02%E2%B8

src/Orchard.Web/Modules/Orchard.Users/Views/Admin/Index.cshtml

@@ -82,7 +82,6 @@
             userIndex++;
 			}
         </table>
-	<span class="hint">@T.Plural("No user found", "{1} users found", (int)Model.Pager.TotalItemCount + 1, (int)Model.Pager.TotalItemCount)</span>
 	@Display(Model.Pager)
     </fieldset>
 } 

src/Orchard.Web/Themes/TheAdmin/Views/Pager.cshtml

@@ -1,4 +1,5 @@
 @{
+	var window = 7; // number of simultaneously displayed pages 
     var nextText = HasText(Model.NextText) ? Model.NextText : T(">").Text;
     var previousText = HasText(Model.PreviousText) ? Model.PreviousText : T("<").Text;
 
@@ -18,13 +19,25 @@
     }
 
     var totalPageCount = (int) Math.Ceiling((double) Model.TotalItemCount / Model.PageSize);
+	var firstPage = Math.Max(1, (int)Model.Page - (window/2));
+	var lastPage = Math.Min(totalPageCount, (int)Model.Page + (window/2));
 
     Model.Classes.Add("pager");
     Model.Classes.Add("group");
     var tag = Tag(Model, "ul");
 }
+<span class="page-results">@T("Showing items {0} - {1} of {2}", (Model.Page-1)*(int)Model.PageSize + 1, Math.Min(Model.TotalItemCount, (Model.Page)*(int)Model.PageSize), Model.TotalItemCount)</span>
 @if (totalPageCount > 1) {
     @tag.StartElement
+    // first
+    if(firstPage > 1) {
+        if (routeData.ContainsKey("page")) {
+            routeData.Remove("page");
+        }
+        <li class="page-first">
+        @Html.ActionLink(T("<<").Text, (string)routeData["action"], (string)routeData["controller"], routeData, null)
+        </li>
+    }
     // previous page
     if(Model.Page > 1) {
         if (Model.Page == 2 && routeData.ContainsKey("page")) {
@@ -38,7 +51,7 @@
         </li>
     }
     // page numbers
-    for (var p = 1; p <= totalPageCount; p++) {
+    for (var p = firstPage; p <= lastPage; p++) {
         <li class="page-@p">
         @if (p == Model.Page) {
             <span>@p</span>
@@ -61,5 +74,12 @@
         @Html.ActionLink((string)nextText, (string)routeData["action"], (string)routeData["controller"], routeData, null)
         </li>
     }
+    // last page
+    if(lastPage < totalPageCount) {
+        routeData["page"] = totalPageCount;
+        <li class="page-last">
+        @Html.ActionLink(T(">>").Text, (string)routeData["action"], (string)routeData["controller"], routeData, null)
+        </li>
+    }
     @tag.EndElement
 }