| /******************************************************************************* |
| * Copyright (c) 2014, 2017 TwelveTone LLC 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: |
| * Steven Spungin <steven@spungin.tv> - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.e4.tools.emf.ui.common; |
| |
| import java.util.Arrays; |
| import java.util.concurrent.ScheduledThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.eclipse.jface.fieldassist.ComboContentAdapter; |
| import org.eclipse.jface.fieldassist.ContentProposalAdapter; |
| import org.eclipse.jface.fieldassist.IContentProposal; |
| import org.eclipse.jface.fieldassist.SimpleContentProposalProvider; |
| import org.eclipse.jface.viewers.ComboViewer; |
| import org.eclipse.jface.viewers.IStructuredSelection; |
| import org.eclipse.jface.viewers.StructuredSelection; |
| import org.eclipse.swt.events.FocusEvent; |
| import org.eclipse.swt.events.FocusListener; |
| import org.eclipse.swt.graphics.Point; |
| import org.eclipse.swt.widgets.Control; |
| |
| /** |
| * Adds auto complete functionality to a combo viewer. It is assumed that the |
| * viewer is created with SWT.SIMPLE and SWT.READONLY flags. The proposals will |
| * be dynamically generated from the viewers current contents. |
| * |
| * @author Steven Spungin |
| * |
| */ |
| public class ComboViewerAutoComplete { |
| |
| private ContentProposalAdapter adapter; |
| |
| public ComboViewerAutoComplete(final ComboViewer dropDown) { |
| // use all items in the wrapped combo as proposals to filter instead of |
| // static String[] |
| SimpleContentProposalProvider proposalProvider = new SimpleContentProposalProvider() { |
| @Override |
| public IContentProposal[] getProposals(String contents, int position) { |
| String[] proposals = dropDown.getCombo().getItems(); |
| setProposals(proposals); |
| return super.getProposals(contents, position); |
| } |
| }; |
| // set the viewer instead of the wrapped combo |
| ComboContentAdapter contentAdapter = new ComboContentAdapter() { |
| @Override |
| public void setControlContents(Control control, String text1, int cursorPosition) { |
| super.setControlContents(control, text1, cursorPosition); |
| int index = Arrays.asList(dropDown.getCombo().getItems()).indexOf(text1); |
| Object object = dropDown.getElementAt(index); |
| dropDown.setSelection(new StructuredSelection(object)); |
| } |
| }; |
| proposalProvider.setFiltering(true); |
| adapter = new ContentProposalAdapter(dropDown.getCombo(), contentAdapter, proposalProvider, null, null); |
| adapter.setPropagateKeys(true); |
| adapter.setProposalAcceptanceStyle(ContentProposalAdapter.PROPOSAL_REPLACE); |
| |
| // Focus the entire field after tab or click |
| dropDown.getCombo().addFocusListener(new FocusListener() { |
| |
| private Object valueWhenFocused; |
| |
| @Override |
| public void focusLost(FocusEvent e) { |
| // Do not allow a null value (e.g. the user clicks with |
| // autocomplete text not set |
| Object object = (((IStructuredSelection) dropDown.getSelection())).getFirstElement(); |
| if (object == null) { |
| dropDown.setSelection(new StructuredSelection(valueWhenFocused)); |
| } |
| } |
| |
| @Override |
| public void focusGained(FocusEvent e) { |
| valueWhenFocused = (((IStructuredSelection) dropDown.getSelection())).getFirstElement(); |
| |
| // If the user clicks the text field (versus tab), the |
| // text will be unselected after we set the selection, so we |
| // need to delay the call |
| // THIS IS A WORKAROUND |
| final ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(1); |
| executor.schedule( |
| () -> dropDown.getCombo().getDisplay() |
| .syncExec(() -> dropDown.getCombo() |
| .setSelection(new Point(0, dropDown.getCombo().getText().length()))), |
| 200, TimeUnit.MILLISECONDS); |
| } |
| }); |
| } |
| |
| public boolean isProposalPopupOpen() { |
| return adapter.isProposalPopupOpen(); |
| } |
| |
| } |