Case Study: adding data and statistics

[ifi-stolz-refaktor.git] / case-study / jdt-before / ui / org / eclipse / jdt / internal / ui / typehierarchy / HistoryDropDownAction.java

diff --git a/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/typehierarchy/HistoryDropDownAction.java b/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/typehierarchy/HistoryDropDownAction.java
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+++ b/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/typehierarchy/HistoryDropDownAction.java
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+/*******************************************************************************
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jdt.internal.ui.typehierarchy;
+
+import java.util.Iterator;
+import java.util.List;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Menu;
+import org.eclipse.swt.widgets.MenuItem;
+
+import org.eclipse.jface.action.Action;
+import org.eclipse.jface.action.ActionContributionItem;
+import org.eclipse.jface.action.IMenuCreator;
+
+import org.eclipse.ui.PlatformUI;
+
+import org.eclipse.jdt.core.IJavaElement;
+
+import org.eclipse.jdt.internal.ui.IJavaHelpContextIds;
+import org.eclipse.jdt.internal.ui.JavaPluginImages;
+
+public class HistoryDropDownAction extends Action implements IMenuCreator {
+
+       public static class ClearHistoryAction extends Action {
+
+               private TypeHierarchyViewPart fView;
+
+               public ClearHistoryAction(TypeHierarchyViewPart view) {
+                       super(TypeHierarchyMessages.HistoryDropDownAction_clearhistory_label);
+                       fView= view;
+               }
+
+               @Override
+               public void run() {
+                       fView.setHistoryEntries(new IJavaElement[0]);
+                       fView.setInputElement(null);
+               }
+       }
+
+       public static final int RESULTS_IN_DROP_DOWN= 10;
+
+       private TypeHierarchyViewPart fHierarchyView;
+       private Menu fMenu;
+
+       public HistoryDropDownAction(TypeHierarchyViewPart view) {
+               fHierarchyView= view;
+               fMenu= null;
+               setToolTipText(TypeHierarchyMessages.HistoryDropDownAction_tooltip);
+               JavaPluginImages.setLocalImageDescriptors(this, "history_list.gif"); //$NON-NLS-1$
+               PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.TYPEHIERARCHY_HISTORY_ACTION);
+               setMenuCreator(this);
+       }
+
+       public void dispose() {
+               // action is reused, can be called several times.
+               if (fMenu != null) {
+                       fMenu.dispose();
+                       fMenu= null;
+               }
+       }
+
+       public Menu getMenu(Menu parent) {
+               return null;
+       }
+
+       public Menu getMenu(Control parent) {
+               if (fMenu != null) {
+                       fMenu.dispose();
+               }
+               fMenu= new Menu(parent);
+               List<IJavaElement[]> elements= fHierarchyView.getHistoryEntries();
+               addEntries(fMenu, elements);
+               new MenuItem(fMenu, SWT.SEPARATOR);
+               addActionToMenu(fMenu, new HistoryListAction(fHierarchyView));
+               addActionToMenu(fMenu, new ClearHistoryAction(fHierarchyView));
+               return fMenu;
+       }
+
+       private boolean addEntries(Menu menu, List<IJavaElement[]> elements) {
+               boolean checked= false;
+               int count= 0;
+               int min= Math.min(elements.size(), RESULTS_IN_DROP_DOWN);
+               for (Iterator<IJavaElement[]> iterator= elements.iterator(); count < min; count++) {
+                       IJavaElement[] entries= iterator.next();
+                       if (entries == null || entries.length == 0)
+                               continue;
+                       HistoryAction action= new HistoryAction(fHierarchyView, entries);
+                       action.setChecked(entries.equals(fHierarchyView.getInputElements()));
+                       checked= checked || action.isChecked();
+                       addActionToMenu(menu, action);
+               }
+               return checked;
+       }
+
+
+       protected void addActionToMenu(Menu parent, Action action) {
+               ActionContributionItem item= new ActionContributionItem(action);
+               item.fill(parent, -1);
+       }
+
+       @Override
+       public void run() {
+               (new HistoryListAction(fHierarchyView)).run();
+       }
+}