old/org.eclipse.emf.ecp.editor/src/org/eclipse/emf/ecp/editor/mecontrols/multiattributecontrol/StringAttributeControl.java

/*******************************************************************************
 * Copyright (c) 2008-2011 Chair for Applied Software Engineering,
 * Technische Universitaet Muenchen.
 * 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:
 ******************************************************************************/
package org.eclipse.emf.ecp.editor.mecontrols.multiattributecontrol;

import org.eclipse.jface.layout.GridDataFactory;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.widgets.Text;

/**
 * Represents a single String field for a MultiAttributeItem.
 * 
 * @author Christian Kroemer (christian.kroemer@z-corp-online.de)
 */
class StringAttributeControl extends AttributeControl {
	private MultiAttributeController<String> dataManipulator;
	private Text widget;
	private String value;

	/**
	 * Constructor for control with content.
	 * 
	 * @param parentItem the corresponding StringMultiAttributeWidget
	 * @param dataManipulator a MultiAttributeController for this widget
	 * @param value the initial value for this control
	 */
	StringAttributeControl(MultiAttributeControl parentItem, MultiAttributeController<String> dataManipulator,
		String value) {
		this.setParentItem(parentItem);
		this.dataManipulator = dataManipulator;
		this.value = value;
		this.setIndex(parentItem.getControlList().size());
		parentItem.getControlList().add(this);

		// initializeFromInt
		createCompositeLayout();
		setWidget(parentItem.getToolkit().createText(getFieldComposite(), value, parentItem.getStyle() | SWT.SINGLE));
		getWidget().addModifyListener(this);
		createDeleteButton();
		createUpDownButtons();
		GridDataFactory.fillDefaults().align(SWT.FILL, SWT.CENTER).grab(true, true).applyTo(getWidget());
	}

	/**
	 * Constructor for control with no initial content.
	 * 
	 * @param parentItem the corresponding StringMultiAttributeWidget
	 * @param dataManipulator a MultiAttributeController for this widget
	 */
	StringAttributeControl(MultiAttributeControl parentItem, MultiAttributeController<String> dataManipulator) {
		this.setParentItem(parentItem);
		this.dataManipulator = dataManipulator;
		this.value = StringMultiAttributeControl.getEmptyValue();

		// initializeFromInt
		createCompositeLayout();
		setWidget(parentItem.getToolkit().createText(getFieldComposite(), value, parentItem.getStyle() | SWT.SINGLE));
		getWidget().addModifyListener(this);
		getWidget().setMessage("Add new element...");
		createAddButton();
		createInvisibleUpDownButtons();
		GridDataFactory.fillDefaults().align(SWT.FILL, SWT.CENTER).grab(true, true).applyTo(getWidget());
	}

	/**
	 * Hidden default constructor.
	 */
	@SuppressWarnings("unused")
	private StringAttributeControl() {
		// hide default constructor
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected boolean swapThisControlWith(int index) {
		if (index >= getParentItem().getControlList().size() || index < 0) {
			return false;
		}
		// create non-duplicate String
		String random = "";
		while (dataManipulator.contains(random)) {
			random = ((Double) Math.random()).toString();
		}
		// use it for swap
		String thisValue = value;
		String otherValue = ((StringAttributeControl) getParentItem().getControlList().get(index)).value;
		getWidget().setText(random);
		((StringAttributeControl) getParentItem().getControlList().get(index)).getWidget().setText(thisValue);
		getWidget().setText(otherValue);

		return true;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void modifyText(ModifyEvent e) { // still duplicated code, but better solution?!
		if (e.getSource().equals(getWidget())) {
			// first edit? --> new button
			if (getIndex() == -1) {
				getButton().dispose();
				getWidget().setMessage("");
				createDeleteButton();
				createUpDownButtons();
			}

			final String newValue = getWidget().getText();

			// handle duplicates
			if (!getParentItem().isAllowDuplicates() && dataManipulator.contains(newValue)) {
				getWidget().setText("_" + newValue);
				return;
			}
			// end of duplicate handling

			if (getIndex() != -1) {
				// was a regular entry before
				dataManipulator.replaceElementAt(getIndex(), newValue);
				value = newValue;
			} else {
				// was a dummy entry before
				this.setIndex(getParentItem().getControlList().size());
				getParentItem().getControlList().add(this);
				dataManipulator.add(newValue);
				value = newValue;
				getButton().setVisible(true);
				if (!getParentItem().isFull()) {
					getParentItem().createSingleField();
				}
				getFieldComposite().layout();
			}

			getParentItem().refreshWidget();
		}
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void addButtonFunctionality() {
		// duplicate handling
		if (!getParentItem().isAllowDuplicates()) {
			while (dataManipulator.contains(value)) {
				value = "_" + value;
			}
		}
		// end of duplicate handling
		// automatically added then (ModifyListener!)
		getWidget().setText(value);
		getButton().dispose();
		getWidget().setMessage("");
		createDeleteButton();
		createUpDownButtons();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected boolean removeElementAt(int i) {
		return dataManipulator.removeElementAt(i);
	}

	/**
	 * @param widget the widget to set
	 */
	public void setWidget(Text widget) {
		this.widget = widget;
	}

	/**
	 * @return the widget
	 */
	public Text getWidget() {
		return widget;
	}
}