ComboSelectionDialog.java

/*******************************************************************************
 * Copyright (c) 2008 Pierre-Antoine Grégoire.
 * 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:
 *    Pierre-Antoine Grégoire - initial API and implementation
 *******************************************************************************/
package org.org.eclipse.core.utils.platform.dialogs.selection;

import org.eclipse.core.runtime.Assert;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.org.eclipse.core.utils.platform.dialogs.Dialog;



/**
 * @author pagregoire
 */

public class ComboSelectionDialog extends Dialog {

    private String fSelection = null;

    private final String fShellTitle;

    private final String fLabelText;

    private final String[] fAllowedStrings;

    private final int fInitialSelectionIndex;

    public ComboSelectionDialog(Shell parentShell, String shellTitle, String labelText, String[] comboStrings, int initialSelectionIndex) {
        super(parentShell);
        Assert.isNotNull(shellTitle);
        Assert.isNotNull(labelText);
        Assert.isTrue(comboStrings.length > 0);
        Assert.isTrue(initialSelectionIndex >= 0 && initialSelectionIndex < comboStrings.length);
        fShellTitle = shellTitle;
        fLabelText = labelText;
        fAllowedStrings = comboStrings;
        fInitialSelectionIndex = initialSelectionIndex;
    }

    public String getSelectedString() {
        return fSelection;
    }

    /*
     * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
     */
    protected Control createDialogArea(Composite parent) {
        getShell().setText(fShellTitle);

        Composite composite = (Composite) super.createDialogArea(parent);
        Composite innerComposite = new Composite(composite, COMPOSITE_STYLE);
        innerComposite.setLayoutData(new GridData());
        GridLayout gl = new GridLayout();
        gl.numColumns = 2;
        innerComposite.setLayout(gl);

        Label label = new Label(innerComposite, SWT.NONE);
        label.setText(fLabelText);
        label.setLayoutData(new GridData());

        final Combo combo = new Combo(innerComposite, SWT.READ_ONLY);
        for (int i = 0; i < fAllowedStrings.length; i++) {
            combo.add(fAllowedStrings[i]);
        }
        combo.select(fInitialSelectionIndex);
        fSelection = combo.getItem(combo.getSelectionIndex());
        GridData gd = new GridData();
        gd.widthHint = convertWidthInCharsToPixels(getMaxStringLength());
        combo.setLayoutData(gd);
        combo.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                fSelection = combo.getItem(combo.getSelectionIndex());
            }
        });
        org.eclipse.jface.dialogs.Dialog.applyDialogFont(composite);
        return composite;
    }

    private int getMaxStringLength() {
        int max = 0;
        for (int i = 0; i < fAllowedStrings.length; i++) {
            max = Math.max(max, fAllowedStrings[i].length());
        }
        return max;
    }
}