tmf/org.eclipse.tracecompass.tmf.ui/src/org/eclipse/tracecompass/tmf/ui/project/handlers/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.tmf.ui.project.handlers;
  11
  12 import org.eclipse.jdt.annotation.NonNullByDefault;
  13 import org.eclipse.jdt.annotation.Nullable;
  14 import org.eclipse.jface.viewers.ISelection;
  15 import org.eclipse.jface.viewers.ISelectionProvider;
  16 import org.eclipse.jface.viewers.TreeSelection;
  17 import org.eclipse.ui.IWorkbenchPage;
  18 import org.eclipse.ui.IWorkbenchPart;
  19 import org.eclipse.ui.IWorkbenchWindow;
  20 import org.eclipse.ui.PlatformUI;
  21
  22 /**
  23  * Utilities for UI handlers
  24  *
  25  * @author Philippe Proulx
  26  * @since 2.3
  27  */
  28 @NonNullByDefault
  29 public final class HandlerUtils {
  30
  31     private HandlerUtils() {
  32     }
  33
  34     /**
  35      * Get the current selected UI element. Can be used instead of
  36      * {@link org.eclipse.ui.handlers.HandlerUtil#getCurrentSelection} when an
  37      * ExecutionEvent is not available.
  38      *
  39      * @return The element consisting of the selection
  40      */
  41     public static @Nullable Object getSelectedModelElement() {
  42         // Check if we are closing down
  43         final IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  44         if (window == null) {
  45             return null;
  46         }
  47
  48         // Get the selection
  49         final IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
  50         final IWorkbenchPart part = page.getActivePart();
  51         if (part == null) {
  52             return null;
  53         }
  54         final ISelectionProvider selectionProvider = part.getSite().getSelectionProvider();
  55         if (selectionProvider == null) {
  56             return null;
  57         }
  58         final ISelection selection = selectionProvider.getSelection();
  59
  60         if (selection instanceof TreeSelection) {
  61             final TreeSelection sel = (TreeSelection) selection;
  62             // There should be only one item selected as per the plugin.xml
  63             return sel.getFirstElement();
  64         }
  65
  66         return null;
  67     }
  68
  69 }