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/*******************************************************************************
* Copyright (C) 2008, 2012 Marek Zawirski <marek.zawirski@gmail.com> and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.egit.ui.internal.components;
import java.util.Collections;
import java.util.List;
import org.eclipse.jface.fieldassist.IContentProposal;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Combo;
/**
* Support class for Combo, extending its functionality to differentiate between
* item label and item content.
* <p>
* This implementation takes {@link IContentProposal} instances as data source.
* <p>
* Use {@link #getContent()} instead of {@link Combo#getText()} to get the
* current item content (instead of label).
*/
public class ComboLabelingSupport {
private final Combo combo;
private List<? extends IContentProposal> proposals;
/**
* Installs labeling support on provided combo. setItems method of combo
* shouldn't be called manually after that installation.
* <p>
* Support class is initialized with empty proposals list.
*
* @param combo
* target combo to install on.
* @param selectionListener
* listener that is notified when content is filled after label
* being clicked. May be null.
*/
public ComboLabelingSupport(final Combo combo,
final SelectionListener selectionListener) {
this.combo = combo;
combo.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
final int i = combo.getSelectionIndex();
if (i != -1 && i < proposals.size()) {
combo.setText(proposals.get(i).getContent());
if (selectionListener != null)
selectionListener.widgetSelected(e);
}
}
});
setProposals(Collections.<IContentProposal> emptyList());
}
/**
* Sets input data for combo.
* <p>
* Proposals are set in provided order.
*
* @param proposals
* model of input data.
*/
public void setProposals(final List<? extends IContentProposal> proposals) {
this.proposals = proposals;
final String[] itemsLabels = new String[proposals.size()];
int i = 0;
for (final IContentProposal p : proposals)
itemsLabels[i++] = p.getLabel();
combo.setItems(itemsLabels);
}
/**
* @return the content of the selected item, or just the text if it does not
* match a proposal
*/
public String getContent() {
String text = combo.getText();
for (final IContentProposal p : proposals)
if (text.equals(p.getLabel()))
return p.getContent();
return text;
}
}
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