ch.netcetera.eclipse.common.dialog.ComboSelectionDialog.java Source code

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Here is the source code for ch.netcetera.eclipse.common.dialog.ComboSelectionDialog.java

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/*******************************************************************************
 * Copyright (c) 2000, 2006 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
 *     ETE Project     - copy out of jdt-internal api into own plugin
 *                     - reformatted (checkstyle compliant), adapted to own needs
 *******************************************************************************/
package ch.netcetera.eclipse.common.dialog;

import java.util.List;

import org.eclipse.jface.dialogs.Dialog;
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;

/**
 * A dialog offering a selection from a combo box.
 */
public class ComboSelectionDialog extends Dialog {

    private String fSelection = null;
    private final String fShellTitle;
    private final String fLabelText;
    private final List<String> fAllowedStrings;
    private final int fInitialSelectionIndex;

    /**
     * Constructor.
     *
     * @param parentShell the parent shell
     * @param shellTitle the title
     * @param labelText the label text
     * @param comboStrings the strings to be displayed in the combo box
     * @param initialSelectionIndex the index of the initially selected item
     */
    public ComboSelectionDialog(Shell parentShell, String shellTitle, String labelText, List<String> comboStrings,
            int initialSelectionIndex) {
        super(parentShell);
        this.fShellTitle = shellTitle;
        this.fLabelText = labelText;
        this.fAllowedStrings = comboStrings;
        this.fInitialSelectionIndex = initialSelectionIndex;
    }

    /**
     * Gets the selected item.
     *
     * @return the selected item
     */
    public String getSelectedString() {
        return this.fSelection;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected Control createDialogArea(Composite parent) {
        getShell().setText(this.fShellTitle);

        Composite composite = (Composite) super.createDialogArea(parent);
        Composite innerComposite = new Composite(composite, SWT.NONE);
        innerComposite.setLayoutData(new GridData());
        GridLayout gl = new GridLayout();
        gl.numColumns = 1;
        innerComposite.setLayout(gl);

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

        final Combo combo = new Combo(innerComposite, SWT.READ_ONLY);
        for (String item : this.fAllowedStrings) {
            combo.add(item);
        }
        combo.select(this.fInitialSelectionIndex);

        this.fSelection = combo.getItem(combo.getSelectionIndex());
        GridData gd = new GridData();
        int widthHint = convertWidthInCharsToPixels(getMaxStringLength()) + 21;
        gd.widthHint = widthHint <= getParentShell().getSize().x ? widthHint : getParentShell().getSize().x - 42;
        combo.setLayoutData(gd);
        combo.addSelectionListener(new SelectionAdapter() {

            @Override
            public void widgetSelected(SelectionEvent e) {
                ComboSelectionDialog.this.fSelection = combo.getItem(combo.getSelectionIndex());
            }
        });
        applyDialogFont(composite);
        return composite;
    }

    private int getMaxStringLength() {
        int max = 0;
        for (String item : this.fAllowedStrings) {
            max = Math.max(max, item.length());
        }
        return max;
    }
}