Package org.olat.core.commons.controllers.linkchooser

Source Code of org.olat.core.commons.controllers.linkchooser.CustomLinkChooserController

/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS,
* <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) 1999-2006 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <p>
*/

package org.olat.core.commons.controllers.linkchooser;

import org.olat.core.gui.UserRequest;
import org.olat.core.gui.components.Component;
import org.olat.core.gui.components.link.Link;
import org.olat.core.gui.components.link.LinkFactory;
import org.olat.core.gui.components.tree.SelectionTree;
import org.olat.core.gui.components.tree.TreeEvent;
import org.olat.core.gui.components.velocity.VelocityContainer;
import org.olat.core.gui.control.Controller;
import org.olat.core.gui.control.DefaultController;
import org.olat.core.gui.control.Event;
import org.olat.core.gui.control.WindowControl;
import org.olat.core.gui.control.generic.ajax.tree.TreeController;
import org.olat.core.gui.control.generic.ajax.tree.TreeNodeClickedEvent;
import org.olat.core.gui.translator.PackageTranslator;
import org.olat.core.gui.translator.Translator;
import org.olat.core.logging.activity.IUserActivityLogger;
import org.olat.core.util.Util;


/**
* Generates internal link. Show a tree-model to select an internal link. The user can select a course-node
* for which an internal link will be generated (gotoNode-link).
* <p>
* Events fired by this controller:
* <ul>
* <li>URLChoosenEvent(URL) containing the selected file URL
* <li>Event.CANCELLED_EVENT
* </ul>

* @author Christian Guretzki
*/
public class CustomLinkChooserController extends DefaultController {

  private static final String VELOCITY_ROOT = Util.getPackageVelocityRoot(CustomLinkChooserController.class);
  private static final String PACKAGE = Util.getPackageName(CustomLinkChooserController.class);

  private Translator trans;
  private VelocityContainer mainVC;

  private SelectionTree jumpInSelectionTree;
  private CustomLinkTreeModel customLinkTreeModel;

  private TreeController ajaxTreeController;
  private Link chooseLink, cancelLink;
  private String selectedAjaxTreePath;
 
  /**
   * Constructor
   */
  public CustomLinkChooserController(UserRequest ureq, WindowControl wControl, CustomLinkTreeModel customLinkTreeModel) {
    super(wControl);

    trans = new PackageTranslator(PACKAGE, ureq.getLocale());

    mainVC = new VelocityContainer("mainVC", VELOCITY_ROOT + "/internallinkchooser.html", trans, this);

    this.customLinkTreeModel = customLinkTreeModel;
    boolean ajax = getWindowControl().getWindowBackOffice().getWindowManager().isAjaxEnabled();
    if (ajax) {
      // For real browsers we use the cool ajax tree
      ajaxTreeController = new TreeController(ureq, getWindowControl(), customLinkTreeModel.getRootNode().getTitle(), customLinkTreeModel, null);
      ajaxTreeController.addControllerListener(this);
      mainVC.put("internalLinkTree", ajaxTreeController.getInitialComponent());
      // choose and cancel link
      chooseLink = LinkFactory.createButton("selectfile", mainVC, this);
      cancelLink = LinkFactory.createButton("cancel", mainVC, this);
    } else {
      // Legacy mode with old selection component
      jumpInSelectionTree = new SelectionTree("internalLinkTree", trans);
      jumpInSelectionTree.setTreeModel(customLinkTreeModel);
      jumpInSelectionTree.addListener(this);
      jumpInSelectionTree.setFormButtonKey("select");
      mainVC.put("internalLinkTree", jumpInSelectionTree);
    }
    setInitialComponent(mainVC);
  }

  /**
   * @see org.olat.core.gui.control.DefaultController#event(org.olat.core.gui.UserRequest,
   *      org.olat.core.gui.components.Component,
   *      org.olat.core.gui.control.Event)
   */
  public void event(UserRequest ureq, Component source, Event event) {
    if (source == jumpInSelectionTree) { // Events from the legacy selection tree
      TreeEvent te = (TreeEvent) event;
      if (te.getCommand().equals(TreeEvent.COMMAND_TREENODE_CLICKED)) {
        // create something like imagepath="javascript:parent.gotonode(<nodeId>)"
        // notify parent controller
        String url = customLinkTreeModel.getInternalLinkUrlFor(jumpInSelectionTree.getSelectedNode().getIdent());
        fireEvent(ureq, new URLChoosenEvent(url));
       
      } else if (te.getCommand().equals(TreeEvent.COMMAND_CANCELLED)) {
        fireEvent(ureq, Event.CANCELLED_EVENT);
      }
    } else // Events from ajax tree view
      if (source == chooseLink) {
        if (selectedAjaxTreePath != null) {
          String url = customLinkTreeModel.getInternalLinkUrlFor(selectedAjaxTreePath);
          fireEvent(ureq, new URLChoosenEvent(url));
        } else {
          fireEvent(ureq, Event.FAILED_EVENT);
        }
      } else if (source == cancelLink) {
        fireEvent(ureq, Event.CANCELLED_EVENT);
      }

  }

  /**
   * @see org.olat.core.gui.control.DefaultController#event(org.olat.core.gui.UserRequest,
   *      org.olat.core.gui.control.Controller, org.olat.core.gui.control.Event)
   */
  public void event(UserRequest ureq, Controller source, Event event) {
    if (source == ajaxTreeController) {
      if (event instanceof TreeNodeClickedEvent) {
        // get the clicked node and resolve the corresponding file
        TreeNodeClickedEvent clickedEvent = (TreeNodeClickedEvent) event;
        selectedAjaxTreePath = clickedEvent.getNodeId();
        // enable link, set dirty button class and trigger redrawing
        chooseLink.setEnabled(true);
        chooseLink.setCustomEnabledLinkCSS("b_button b_button_dirty");
        chooseLink.setDirty(true);
      }
    }
  }

  /**
   * @see org.olat.core.gui.control.DefaultController#doDispose(boolean)
   */
  protected void doDispose() {
  }
}
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