code.grnet.gr Git - pithos/blob - src/gr/ebs/gss/client/Groups.java

   1 /*\r
   2  * Copyright 2007, 2008, 2009 Electronic Business Systems Ltd.\r
   3  *\r
   4  * This file is part of GSS.\r
   5  *\r
   6  * GSS is free software: you can redistribute it and/or modify\r
   7  * it under the terms of the GNU General Public License as published by\r
   8  * the Free Software Foundation, either version 3 of the License, or\r
   9  * (at your option) any later version.\r
  10  *\r
  11  * GSS is distributed in the hope that it will be useful,\r
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14  * GNU General Public License for more details.\r
  15  *\r
  16  * You should have received a copy of the GNU General Public License\r
  17  * along with GSS.  If not, see <http://www.gnu.org/licenses/>.\r
  18  */\r
  19 package gr.ebs.gss.client;\r
  20 \r
  21 import gr.ebs.gss.client.rest.GetCommand;\r
  22 import gr.ebs.gss.client.rest.MultipleGetCommand;\r
  23 import gr.ebs.gss.client.rest.resource.GroupResource;\r
  24 import gr.ebs.gss.client.rest.resource.GroupUserResource;\r
  25 import gr.ebs.gss.client.rest.resource.GroupsResource;\r
  26 \r
  27 import java.util.List;\r
  28 \r
  29 import com.google.gwt.core.client.GWT;\r
  30 import com.google.gwt.dom.client.NativeEvent;\r
  31 import com.google.gwt.event.dom.client.ContextMenuEvent;\r
  32 import com.google.gwt.event.dom.client.ContextMenuHandler;\r
  33 import com.google.gwt.event.logical.shared.OpenEvent;\r
  34 import com.google.gwt.event.logical.shared.OpenHandler;\r
  35 import com.google.gwt.event.logical.shared.SelectionEvent;\r
  36 import com.google.gwt.event.logical.shared.SelectionHandler;\r
  37 import com.google.gwt.resources.client.ClientBundle;\r
  38 import com.google.gwt.resources.client.ImageResource;\r
  39 import com.google.gwt.user.client.DOM;\r
  40 import com.google.gwt.user.client.DeferredCommand;\r
  41 import com.google.gwt.user.client.Event;\r
  42 import com.google.gwt.user.client.ui.AbstractImagePrototype;\r
  43 import com.google.gwt.user.client.ui.Composite;\r
  44 import com.google.gwt.user.client.ui.HTML;\r
  45 import com.google.gwt.user.client.ui.Tree;\r
  46 import com.google.gwt.user.client.ui.TreeItem;\r
  47 \r
  48 /**\r
  49  * A component that displays a list of the user's groups.\r
  50  */\r
  51 public class Groups extends Composite implements SelectionHandler, OpenHandler {\r
  52 \r
  53         /**\r
  54          * An image bundle for this widget.\r
  55          */\r
  56         public interface Images extends Tree.Resources, ClientBundle, FileMenu.Images, EditMenu.Images, GroupMenu.Images, MessagePanel.Images {\r
  57 \r
  58                 /**\r
  59                  * Will bundle the file 'groupevent.png' residing in the package\r
  60                  * 'gr.ebs.gss.resources'.\r
  61                  *\r
  62                  * @return the image prototype\r
  63                  */\r
  64                 @Source("gr/ebs/gss/resources/groupevent.png")\r
  65                 ImageResource groupImage();\r
  66 \r
  67                 @Override\r
  68                 @Source("gr/ebs/gss/resources/editdelete.png")\r
  69                 ImageResource delete();\r
  70 \r
  71         }\r
  72 \r
  73         /**\r
  74          * cached latest group selection (for selecting and expanding on refresh)\r
  75          */\r
  76         private String selectedGroup = null;\r
  77 \r
  78         /**\r
  79          * The tree widget that displays the groups.\r
  80          */\r
  81         private Tree tree;\r
  82 \r
  83         /**\r
  84          * A cached copy of the currently selected group widget.\r
  85          */\r
  86         private TreeItem current;\r
  87 \r
  88         /**\r
  89          * A cached copy of the previously selected group widget.\r
  90          */\r
  91         private TreeItem previous;\r
  92 \r
  93         /**\r
  94          * The widget's image bundle.\r
  95          */\r
  96         private final Images images;\r
  97 \r
  98         private GroupContextMenu menu;\r
  99 \r
 100         /**\r
 101          * Constructs a new groups widget with a bundle of images.\r
 102          *\r
 103          * @param newImages a bundle that provides the images for this widget\r
 104          */\r
 105         public Groups(final Images newImages) {\r
 106 \r
 107                 images = newImages;\r
 108                 menu = new GroupContextMenu(images);\r
 109                 tree = new Tree(newImages);\r
 110                 this.addHandler(new ContextMenuHandler() {\r
 111 \r
 112                         @Override\r
 113                         public void onContextMenu(ContextMenuEvent event) {\r
 114                                 if(current==null) return;\r
 115                                 int left = current.getAbsoluteLeft() + 40;\r
 116                                 int top = current.getAbsoluteTop() + 20;\r
 117                                 showPopup(left, top);\r
 118 \r
 119                         }\r
 120                 }, ContextMenuEvent.getType());\r
 121                 tree.addSelectionHandler(this);\r
 122                 tree.addOpenHandler(this);\r
 123                 tree.setAnimationEnabled(true);\r
 124                 initWidget(tree);\r
 125                 setStylePrimaryName("gss-Groups");\r
 126                 sinkEvents(Event.ONCONTEXTMENU);\r
 127                 sinkEvents(Event.ONMOUSEUP);\r
 128                 sinkEvents(Event.ONDBLCLICK);\r
 129         }\r
 130 \r
 131 \r
 132         /**\r
 133          * Make an RPC call to retrieve the groups that belong to the specified\r
 134          * user.\r
 135          */\r
 136         public void updateGroups() {\r
 137                 GetCommand<GroupsResource> gg = new GetCommand<GroupsResource>(GroupsResource.class, GSS.get().getCurrentUserResource().getGroupsPath(),null){\r
 138 \r
 139                         @Override\r
 140                         public void onComplete() {\r
 141                                 GroupsResource res = getResult();\r
 142                                 MultipleGetCommand<GroupResource> ga = new MultipleGetCommand<GroupResource>(GroupResource.class, res.getGroupPaths().toArray(new String[]{}), null){\r
 143 \r
 144                                         @Override\r
 145                                         public void onComplete() {\r
 146                                                 List<GroupResource> groupList = getResult();\r
 147                                                 tree.clear();\r
 148                                                 for (int i = 0; i < groupList.size(); i++) {\r
 149                                                         final TreeItem item = new TreeItem();\r
 150                                                         item.setWidget(imageItemHTML(images.groupImage(), groupList.get(i).getName(),item));\r
 151                                                         item.setUserObject(groupList.get(i));\r
 152                                                         tree.addItem(item);\r
 153                                                         updateUsers(item);\r
 154                                                 }\r
 155                                         }\r
 156 \r
 157                                         @Override\r
 158                                         public void onError(Throwable t) {\r
 159                                                 GWT.log("", t);\r
 160                                         }\r
 161 \r
 162                                         @Override\r
 163                                         public void onError(String p, Throwable throwable) {\r
 164                                                 GWT.log("Path:"+p, throwable);\r
 165                                         }\r
 166                                 };\r
 167                                 DeferredCommand.addCommand(ga);\r
 168                         }\r
 169 \r
 170                         @Override\r
 171                         public void onError(Throwable t) {\r
 172 \r
 173                         }\r
 174                 };\r
 175                 DeferredCommand.addCommand(gg);\r
 176         }\r
 177 \r
 178         /**\r
 179          *  update status panel with currently showing file stats\r
 180          */\r
 181         public void updateCurrentlyShowingStats() {\r
 182                 GSS.get().getStatusPanel().updateCurrentlyShowing(null); //clear stats - nothing to show for the groups tab\r
 183         }\r
 184 \r
 185         /**\r
 186          * A helper method to simplify adding tree items that have attached images.\r
 187          * {@link #addImageItem(TreeItem, String) code}\r
 188          *\r
 189          * @param parent the tree item to which the new item will be added.\r
 190          * @param title the text associated with this item.\r
 191          * @param imageProto\r
 192          * @return the new tree item\r
 193          */\r
 194         private TreeItem addImageItem(final TreeItem parent, final String title, final ImageResource imageProto) {\r
 195                 final TreeItem item = new TreeItem();\r
 196                 item.setWidget(imageItemHTML(imageProto, title,item));\r
 197                 parent.addItem(item);\r
 198                 return item;\r
 199         }\r
 200 \r
 201         /**\r
 202          * Generates HTML for a tree item with an attached icon.\r
 203          *\r
 204          * @param imageProto the icon image\r
 205          * @param title the title of the item\r
 206          * @return the resultant HTML\r
 207          */\r
 208         private HTML imageItemHTML(final ImageResource imageProto, final String title,final TreeItem item) {\r
 209                 final HTML link = new HTML("<a class='hidden-link' href='javascript:;'>" + "<span>" + AbstractImagePrototype.create(imageProto).getHTML() + "&nbsp;" + title + "</span>" + "</a>"){\r
 210                         @Override\r
 211                         public void onBrowserEvent(Event event) {\r
 212                                 switch (DOM.eventGetType(event)) {\r
 213                                         case Event.ONMOUSEDOWN:\r
 214                                                 if (DOM.eventGetButton(event) == NativeEvent.BUTTON_RIGHT || DOM.eventGetButton(event) == NativeEvent.BUTTON_LEFT)\r
 215                                                         onSelection(item);\r
 216                                                 break;\r
 217                                 }\r
 218                                 super.onBrowserEvent(event);\r
 219 \r
 220                         }\r
 221                 };\r
 222                 link.sinkEvents(Event.ONMOUSEDOWN);\r
 223                 return link;\r
 224         }\r
 225 \r
 226 \r
 227 \r
 228         protected void showPopup(final int x, final int y) {\r
 229                 if (getCurrent() == null){\r
 230                         GWT.log("[POPUP IS NULL]", null);\r
 231                         return;\r
 232                 }\r
 233                 menu.hide();\r
 234                 menu = new GroupContextMenu(images);\r
 235                 menu.setPopupPosition(x, y);\r
 236                 menu.show();\r
 237         }\r
 238 \r
 239 \r
 240 \r
 241         /**\r
 242          * Generate an RPC request to retrieve the users of the specified group for\r
 243          * display.\r
 244          *\r
 245          * @param userId the ID of the current user\r
 246          * @param groupItem the TreeItem widget that corresponds to the requested\r
 247          *            group\r
 248          */\r
 249         void updateUsers(final TreeItem groupItem) {\r
 250                 if(groupItem.getUserObject() instanceof GroupResource){\r
 251                         GroupResource res = (GroupResource) groupItem.getUserObject();\r
 252                         MultipleGetCommand<GroupUserResource> gu = new MultipleGetCommand<GroupUserResource>(GroupUserResource.class, res.getUserPaths().toArray(new String[]{}), null){\r
 253                                 @Override\r
 254                                 public void onComplete() {\r
 255                                         List<GroupUserResource> users = getResult();\r
 256                                         groupItem.removeItems();\r
 257                                         for (int i = 0; i < users.size(); i++) {\r
 258                                                 final TreeItem userItem = addImageItem(groupItem, users.get(i).getName() + " &lt;" + users.get(i).getUsername() + "&gt;", images.permUser());\r
 259                                                 userItem.setUserObject(users.get(i));\r
 260                                         }\r
 261                                         if (selectedGroup != null && groupItem.getText().equals(selectedGroup)) {\r
 262                                                 //SelectionEvent.fire(tree, groupItem);;\r
 263                                                 onSelection(groupItem);\r
 264                                                 groupItem.setState(true);\r
 265                                         }\r
 266                                 }\r
 267 \r
 268                                 @Override\r
 269                                 public void onError(Throwable t) {\r
 270                                         GWT.log("", t);\r
 271                                 }\r
 272 \r
 273                                 @Override\r
 274                                 public void onError(String p, Throwable throwable) {\r
 275                                         GWT.log("Path:"+p, throwable);\r
 276                                 }\r
 277                         };\r
 278                         DeferredCommand.addCommand(gu);\r
 279                 }\r
 280 \r
 281         }\r
 282 \r
 283         /**\r
 284          * Retrieve the current.\r
 285          *\r
 286          * @return the current\r
 287          */\r
 288         TreeItem getCurrent() {\r
 289                 return current;\r
 290         }\r
 291 \r
 292         /**\r
 293          * Modify the current.\r
 294          *\r
 295          * @param newCurrent the current to set\r
 296          */\r
 297         void setCurrent(final TreeItem newCurrent) {\r
 298                 current = newCurrent;\r
 299         }\r
 300 \r
 301         /**\r
 302          * Retrieve the previous.\r
 303          *\r
 304          * @return the previous\r
 305          */\r
 306         private TreeItem getPrevious() {\r
 307                 return previous;\r
 308         }\r
 309 \r
 310         /**\r
 311          * Modify the previous.\r
 312          *\r
 313          * @param newPrevious the previous to set\r
 314          */\r
 315         private void setPrevious(final TreeItem newPrevious) {\r
 316                 previous = newPrevious;\r
 317         }\r
 318 \r
 319         @Override\r
 320         public void setVisible(final boolean visible) {\r
 321                 super.setVisible(visible);\r
 322                 if (visible)\r
 323                         updateGroups();\r
 324         }\r
 325 \r
 326         @Override\r
 327         public void onSelection(SelectionEvent event) {\r
 328                 final TreeItem item = (TreeItem)event.getSelectedItem();\r
 329                 onSelection(item);\r
 330 \r
 331         }\r
 332 \r
 333         private void onSelection(TreeItem item){\r
 334                 final Object selected = item.getUserObject();\r
 335                 // Preserve the previously selected item, so that the current's\r
 336                 // onClick() method gets a chance to find it.\r
 337                 if (getPrevious() != null)\r
 338                         getPrevious().getWidget().removeStyleName("gss-SelectedRow");\r
 339                 setCurrent(item);\r
 340                 getCurrent().getWidget().addStyleName("gss-SelectedRow");\r
 341                 setPrevious(getCurrent());\r
 342                 GSS.get().setCurrentSelection(selected);\r
 343                 //cache the latest top level node (group) for selecting and expanding on refresh\r
 344                 if (item.getParentItem() == null)\r
 345                         selectedGroup = item.getText();\r
 346                 else\r
 347                         selectedGroup = item.getParentItem().getText();\r
 348         }\r
 349 \r
 350         @Override\r
 351         public void onOpen(OpenEvent event) {\r
 352                 final TreeItem item = (TreeItem) event.getTarget();\r
 353                 updateUsers(item);\r
 354         }\r
 355 }\r