| /******************************************************************************* |
| * Copyright (c) 2007, 2008 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.jface.text; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.eclipse.swt.events.DisposeEvent; |
| import org.eclipse.swt.events.DisposeListener; |
| import org.eclipse.swt.widgets.Composite; |
| import org.eclipse.swt.widgets.Shell; |
| |
| |
| /** |
| * Abstract class for a reusable information control creators. |
| * |
| * @since 3.3 |
| */ |
| public abstract class AbstractReusableInformationControlCreator implements IInformationControlCreator, IInformationControlCreatorExtension, DisposeListener { |
| |
| private Map<Shell, IInformationControl> fInformationControls= new HashMap<>(); |
| |
| /** |
| * Creates the control. |
| * |
| * @param parent the parent shell |
| * @return the created information control |
| */ |
| protected abstract IInformationControl doCreateInformationControl(Shell parent); |
| |
| @Override |
| public IInformationControl createInformationControl(Shell parent) { |
| IInformationControl control= fInformationControls.get(parent); |
| if (control == null) { |
| control= doCreateInformationControl(parent); |
| control.addDisposeListener(this); |
| fInformationControls.put(parent, control); |
| } |
| return control; |
| } |
| |
| @Override |
| public void widgetDisposed(DisposeEvent e) { |
| Composite parent= null; |
| if (e.widget instanceof Shell) |
| parent= ((Shell)e.widget).getParent(); |
| if (parent instanceof Shell) |
| fInformationControls.remove(parent); |
| } |
| |
| |
| @Override |
| public boolean canReuse(IInformationControl control) { |
| return fInformationControls.containsValue(control); |
| } |
| |
| @Override |
| public boolean canReplace(IInformationControlCreator creator) { |
| return creator.getClass() == getClass(); |
| } |
| } |