code.grnet.gr Git - pithos/blob - web_client/src/gr/grnet/pithos/web/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.grnet.pithos.web.client;\r
  20 \r
  21 import gr.grnet.pithos.web.client.rest.GetCommand;\r
  22 import gr.grnet.pithos.web.client.rest.MultipleGetCommand;\r
  23 import gr.grnet.pithos.web.client.rest.resource.GroupResource;\r
  24 import gr.grnet.pithos.web.client.rest.resource.GroupUserResource;\r
  25 import gr.grnet.pithos.web.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.grnet.pithos.web.resources'.\r
  61                  *\r
  62                  * @return the image prototype\r
  63                  */\r
  64                 @Source("gr/grnet/pithos/resources/groupevent.png")\r
  65                 ImageResource groupImage();\r
  66 \r
  67                 @Override\r
  68                 @Source("gr/grnet/pithos/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.getElement().setId("groupsList.tree");\r
 122                 tree.addSelectionHandler(this);\r
 123                 tree.addOpenHandler(this);\r
 124                 tree.setAnimationEnabled(true);\r
 125                 initWidget(tree);\r
 126                 this.getElement().setAttribute("id", "CreativeFilesPanel");\r
 127                 setStylePrimaryName("pithos-Groups");\r
 128                 sinkEvents(Event.ONCONTEXTMENU);\r
 129                 sinkEvents(Event.ONMOUSEUP);\r
 130                 sinkEvents(Event.ONDBLCLICK);\r
 131                 sinkEvents(Event.KEYEVENTS);\r
 132         }\r
 133 \r
 134 \r
 135         /**\r
 136          * Make an RPC call to retrieve the groups that belong to the specified\r
 137          * user.\r
 138          */\r
 139         public void updateGroups() {\r
 140                 GetCommand<GroupsResource> gg = new GetCommand<GroupsResource>(GroupsResource.class, GSS.get().getCurrentUserResource().getGroupsPath(),null){\r
 141 \r
 142                         @Override\r
 143                         public void onComplete() {\r
 144                                 GroupsResource res = getResult();\r
 145                                 MultipleGetCommand<GroupResource> ga = new MultipleGetCommand<GroupResource>(GroupResource.class, res.getGroupPaths().toArray(new String[]{}), null){\r
 146 \r
 147                                         @Override\r
 148                                         public void onComplete() {\r
 149                                                 List<GroupResource> groupList = getResult();\r
 150                                                 tree.clear();\r
 151                                                 for (int i = 0; i < groupList.size(); i++) {\r
 152                                                         final TreeItem item = new TreeItem();\r
 153                                                         item.setWidget(imageItemHTML(images.groupImage(), groupList.get(i).getName(),item));\r
 154                                                         item.setUserObject(groupList.get(i));                                                   \r
 155                                                         tree.addItem(item);\r
 156                                                         updateUsers(item);\r
 157                                                 }\r
 158                                         }\r
 159 \r
 160                                         @Override\r
 161                                         public void onError(Throwable t) {\r
 162                                                 GWT.log("", t);\r
 163                                         }\r
 164 \r
 165                                         @Override\r
 166                                         public void onError(String p, Throwable throwable) {\r
 167                                                 GWT.log("Path:"+p, throwable);\r
 168                                         }\r
 169                                 };\r
 170                                 DeferredCommand.addCommand(ga);\r
 171                         }\r
 172 \r
 173                         @Override\r
 174                         public void onError(Throwable t) {\r
 175 \r
 176                         }\r
 177                 };\r
 178                 DeferredCommand.addCommand(gg);\r
 179         }\r
 180 \r
 181         /**\r
 182          *  update status panel with currently showing file stats\r
 183          */\r
 184         public void updateCurrentlyShowingStats() {\r
 185                 GSS.get().getStatusPanel().updateCurrentlyShowing(null); //clear stats - nothing to show for the groups tab\r
 186         }\r
 187 \r
 188         /**\r
 189          * A helper method to simplify adding tree items that have attached images.\r
 190          *\r
 191          * @param parent the tree item to which the new item will be added.\r
 192          * @param title the text associated with this item.\r
 193          * @param imageProto\r
 194          * @return the new tree item\r
 195          */\r
 196         private TreeItem addImageItem(final TreeItem parent, final String title, final ImageResource imageProto) {\r
 197                 final TreeItem item = new TreeItem();\r
 198                 item.setWidget(imageItemHTML(imageProto, title,item));\r
 199                 parent.addItem(item);\r
 200                 return item;\r
 201         }\r
 202 \r
 203         /**\r
 204          * Generates HTML for a tree item with an attached icon.\r
 205          *\r
 206          * @param imageProto the icon image\r
 207          * @param title the title of the item\r
 208          * @return the resultant HTML\r
 209          */\r
 210         private HTML imageItemHTML(final ImageResource imageProto, final String title,final TreeItem item) {\r
 211                 final HTML link = new HTML("<a class='hidden-link' href='javascript:;'>" + "<span id='groupsList."+title+"'>" + AbstractImagePrototype.create(imageProto).getHTML() + "&nbsp;" + title + "</span>" + "</a>"){\r
 212                         @Override\r
 213                         public void onBrowserEvent(Event event) {\r
 214                                 switch (DOM.eventGetType(event)) {\r
 215                                         case Event.ONMOUSEDOWN:\r
 216                                                 if (DOM.eventGetButton(event) == NativeEvent.BUTTON_RIGHT || DOM.eventGetButton(event) == NativeEvent.BUTTON_LEFT)\r
 217                                                         onSelection(item);\r
 218                                                 break;\r
 219                                         case Event.ONCONTEXTMENU:\r
 220                                                 showPopup(event.getClientX(), event.getClientY());\r
 221                                                 event.preventDefault();\r
 222                                                 event.stopPropagation();\r
 223                                                 break;\r
 224                                 }\r
 225                                 super.onBrowserEvent(event);\r
 226 \r
 227                         }\r
 228                 };                      \r
 229                 link.sinkEvents(Event.ONMOUSEDOWN);\r
 230                 link.sinkEvents(Event.ONCONTEXTMENU);\r
 231                 link.sinkEvents(Event.ONCLICK);\r
 232                 link.sinkEvents(Event.ONKEYDOWN);               \r
 233                 return link;\r
 234         }\r
 235 \r
 236 \r
 237 \r
 238         protected void showPopup(final int x, final int y) {\r
 239                 menu.hide();\r
 240                 menu = new GroupContextMenu(images);\r
 241                 menu.setPopupPosition(x, y);\r
 242                 menu.show();\r
 243         }\r
 244 \r
 245 \r
 246 \r
 247         /**\r
 248          * Generate an RPC request to retrieve the users of the specified group for\r
 249          * display.\r
 250          *\r
 251          * @param groupItem the TreeItem widget that corresponds to the requested\r
 252          *            group\r
 253          */\r
 254         void updateUsers(final TreeItem groupItem) {\r
 255                 if(groupItem.getUserObject() instanceof GroupResource){\r
 256                         GroupResource res = (GroupResource) groupItem.getUserObject();\r
 257                         MultipleGetCommand<GroupUserResource> gu = new MultipleGetCommand<GroupUserResource>(GroupUserResource.class, res.getUserPaths().toArray(new String[]{}), null){\r
 258                                 @Override\r
 259                                 public void onComplete() {\r
 260                                         List<GroupUserResource> users = getResult();\r
 261                                         groupItem.removeItems();\r
 262                                         for (int i = 0; i < users.size(); i++) {\r
 263                                                 final TreeItem userItem = addImageItem(groupItem, users.get(i).getName() + " &lt;" + users.get(i).getUsername() + "&gt;", images.permUser());\r
 264                                                 userItem.setUserObject(users.get(i));\r
 265                                         }\r
 266                                         if (selectedGroup != null && groupItem.getText().equals(selectedGroup)) {\r
 267                                                 //SelectionEvent.fire(tree, groupItem);;\r
 268                                                 onSelection(groupItem);\r
 269                                                 groupItem.setState(true);\r
 270                                         }\r
 271                                 }\r
 272 \r
 273                                 @Override\r
 274                                 public void onError(Throwable t) {\r
 275                                         GWT.log("", t);\r
 276                                 }\r
 277 \r
 278                                 @Override\r
 279                                 public void onError(String p, Throwable throwable) {\r
 280                                         GWT.log("Path:"+p, throwable);\r
 281                                 }\r
 282                         };\r
 283                         DeferredCommand.addCommand(gu);\r
 284                 }\r
 285 \r
 286         }\r
 287 \r
 288         /**\r
 289          * Retrieve the current.\r
 290          *\r
 291          * @return the current\r
 292          */\r
 293         TreeItem getCurrent() {\r
 294                 return current;\r
 295         }\r
 296 \r
 297         /**\r
 298          * Modify the current.\r
 299          *\r
 300          * @param newCurrent the current to set\r
 301          */\r
 302         void setCurrent(final TreeItem newCurrent) {\r
 303                 current = newCurrent;\r
 304         }\r
 305 \r
 306         /**\r
 307          * Retrieve the previous.\r
 308          *\r
 309          * @return the previous\r
 310          */\r
 311         private TreeItem getPrevious() {\r
 312                 return previous;\r
 313         }\r
 314 \r
 315         /**\r
 316          * Modify the previous.\r
 317          *\r
 318          * @param newPrevious the previous to set\r
 319          */\r
 320         private void setPrevious(final TreeItem newPrevious) {\r
 321                 previous = newPrevious;\r
 322         }\r
 323 \r
 324         @Override\r
 325         public void setVisible(final boolean visible) {\r
 326                 super.setVisible(visible);\r
 327                 if (visible)\r
 328                         updateGroups();\r
 329         }\r
 330 \r
 331         @Override\r
 332         public void onSelection(SelectionEvent event) {\r
 333                 final TreeItem item = (TreeItem)event.getSelectedItem();\r
 334                 onSelection(item);\r
 335 \r
 336         }\r
 337 \r
 338         private void onSelection(TreeItem item){\r
 339                 final Object selected = item.getUserObject();\r
 340                 // Preserve the previously selected item, so that the current's\r
 341                 // onClick() method gets a chance to find it.\r
 342                 if (getPrevious() != null)\r
 343                         getPrevious().getWidget().removeStyleName("pithos-SelectedRow");\r
 344                 setCurrent(item);\r
 345                 getCurrent().getWidget().addStyleName("pithos-SelectedRow");\r
 346                 setPrevious(getCurrent());\r
 347                 GSS.get().setCurrentSelection(selected);\r
 348                 //cache the latest top level node (group) for selecting and expanding on refresh\r
 349                 if (item.getParentItem() == null)\r
 350                         selectedGroup = item.getText();\r
 351                 else\r
 352                         selectedGroup = item.getParentItem().getText();\r
 353         }\r
 354 \r
 355         @Override\r
 356         public void onOpen(OpenEvent event) {\r
 357                 final TreeItem item = (TreeItem) event.getTarget();\r
 358                 updateUsers(item);\r
 359         }\r
 360 }\r