analysis/org.eclipse.tracecompass.analysis.lami.ui/src/org/eclipse/tracecompass/internal/provisional/analysis/lami/ui/handler/HandlerUtils.java

   1 /*******************************************************************************
   2  * Copyright (c) 2016 EfficiOS Inc., Alexandre Montplaisir, Philippe Proulx
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *******************************************************************************/
   9
  10 package org.eclipse.tracecompass.internal.provisional.analysis.lami.ui.handler;
  11
  12 import org.eclipse.jdt.annotation.Nullable;
  13 import org.eclipse.jface.viewers.ISelection;
  14 import org.eclipse.jface.viewers.ISelectionProvider;
  15 import org.eclipse.jface.viewers.TreeSelection;
  16 import org.eclipse.ui.IWorkbenchPage;
  17 import org.eclipse.ui.IWorkbenchPart;
  18 import org.eclipse.ui.IWorkbenchWindow;
  19 import org.eclipse.ui.PlatformUI;
  20
  21 /**
  22  * Utilities for UI handlers
  23  *
  24  * @author Philippe Proulx
  25  */
  26 public final class HandlerUtils {
  27
  28     private HandlerUtils() {
  29     }
  30
  31     /**
  32      * Get the current selected UI element. Can be used instead of
  33      * {@link org.eclipse.ui.handlers.HandlerUtil#getCurrentSelection} when an
  34      * ExecutionEvent is not available.
  35      *
  36      * @return The element consisting of the selection
  37      */
  38     public static @Nullable Object getSelectedModelElement() {
  39         // Check if we are closing down
  40         final IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  41         if (window == null) {
  42             return null;
  43         }
  44
  45         // Get the selection
  46         final IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
  47         final IWorkbenchPart part = page.getActivePart();
  48         if (part == null) {
  49             return null;
  50         }
  51         final ISelectionProvider selectionProvider = part.getSite().getSelectionProvider();
  52         if (selectionProvider == null) {
  53             return null;
  54         }
  55         final ISelection selection = selectionProvider.getSelection();
  56
  57         if (selection instanceof TreeSelection) {
  58             final TreeSelection sel = (TreeSelection) selection;
  59             // There should be only one item selected as per the plugin.xml
  60             return sel.getFirstElement();
  61         }
  62
  63         return null;
  64     }
  65
  66 }