org.eclipse.wb.internal.css.dialogs.style.LengthValueEditor.java Source code

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Here is the source code for org.eclipse.wb.internal.css.dialogs.style.LengthValueEditor.java

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/*******************************************************************************
 * Copyright (c) 2011 Google, Inc.
 * 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:
 *    Google, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.wb.internal.css.dialogs.style;

import org.eclipse.wb.internal.core.utils.ui.GridDataFactory;
import org.eclipse.wb.internal.css.semantics.AbstractValue;
import org.eclipse.wb.internal.css.semantics.IValueListener;
import org.eclipse.wb.internal.css.semantics.LengthValue;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;

import org.apache.commons.lang.ArrayUtils;

/**
 * Editor for {@link LengthValue}.
 * 
 * @author scheglov_ke
 * @coverage CSS.ui
 */
public final class LengthValueEditor extends AbstractValueEditor {
    private final LengthValue m_value;
    private final String[] m_values;

    ////////////////////////////////////////////////////////////////////////////
    //
    // Constructor
    //
    ////////////////////////////////////////////////////////////////////////////
    public LengthValueEditor(StyleEditOptions options, LengthValue value, String title, String[] values) {
        super(options, title, value);
        m_value = value;
        m_values = values;
    }

    ////////////////////////////////////////////////////////////////////////////
    //
    // GUI
    //
    ////////////////////////////////////////////////////////////////////////////
    private Combo m_valueCombo;
    private Combo m_unitCombo;

    @Override
    public void doFillGrid(Composite parent, int numColumns) {
        doFillGrid(parent, numColumns, false);
    }

    public void doFillGrid(Composite parent, int numColumns, boolean grab) {
        requireColumns(4, numColumns);
        createTitleLabel(parent);
        // value combo
        {
            m_valueCombo = new Combo(parent, SWT.NONE);
            GridDataFactory.create(m_valueCombo).spanH(numColumns - 3).hintHC(10).fill();
            if (grab) {
                GridDataFactory.modify(m_valueCombo).grabH();
            }
            // add values
            if (m_values != null) {
                for (int i = 0; i < m_values.length; i++) {
                    String specialValue = m_values[i];
                    m_valueCombo.add(specialValue);
                }
            }
            // configure drop count
            m_valueCombo.setVisibleItemCount(Math.min(m_valueCombo.getItemCount(), 20));
            // add listeners
            {
                Listener listener = new Listener() {
                    public void handleEvent(Event event) {
                        // update value
                        m_value.setValue(m_valueCombo.getText());
                        // update unit
                        {
                            boolean requiresUnit = m_value.requiresUnit();
                            m_unitCombo.setEnabled(requiresUnit);
                            if (requiresUnit && !m_value.hasUnit()) {
                                m_value.setUnit(LengthValue.UNIT_NAMES[m_unitCombo.getSelectionIndex()]);
                            }
                        }
                    }
                };
                m_valueCombo.addListener(SWT.Modify, listener);
                m_valueCombo.addListener(SWT.Selection, listener);
            }
        }
        // unit combo
        {
            m_unitCombo = new Combo(parent, SWT.READ_ONLY);
            String[] unitTitles = LengthValue.UNIT_TITLES;
            for (int i = 0; i < unitTitles.length; i++) {
                String unitTitle = unitTitles[i];
                m_unitCombo.add(unitTitle);
            }
            m_unitCombo.setVisibleItemCount(m_unitCombo.getItemCount());
            m_unitCombo.select(0);
            // add listener
            m_unitCombo.addSelectionListener(new SelectionAdapter() {
                @Override
                public void widgetSelected(SelectionEvent e) {
                    m_value.setUnit(LengthValue.UNIT_NAMES[m_unitCombo.getSelectionIndex()]);
                }
            });
        }
        // add listener for value
        m_value.addListener(new IValueListener() {
            public void changed(AbstractValue value) {
                updateControlsFromValue();
            }
        });
        // clear button
        createClearButton(parent);
    }

    private void updateControlsFromValue() {
        if (m_value.hasValue()) {
            String newValue = m_value.getValue();
            if (!newValue.equals(m_valueCombo.getText())) {
                m_valueCombo.setText(newValue);
            }
        } else {
            m_valueCombo.setText("");
        }
        //
        if (m_value.hasUnit()) {
            int index = ArrayUtils.indexOf(LengthValue.UNIT_NAMES, m_value.getUnit());
            if (m_unitCombo.getSelectionIndex() != index) {
                m_unitCombo.select(index);
            }
        }
        if (!m_value.requiresUnit()) {
            m_unitCombo.setEnabled(false);
        }
    }
}