org.mihalis.opal/src/main/java/org/mihalis/opal/breadcrumb/BreadcrumbItem.java

/*******************************************************************************
 * Copyright (c) 2012 Laurent CARON. 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: 
 *     Laurent CARON (laurent.caron at gmail dot com) - initial API and implementation
 *******************************************************************************/
package org.mihalis.opal.breadcrumb;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.widgets.Widget;
import org.mihalis.opal.utils.SWTGraphicUtil;

/**
 * Instances of this class represent a selectable user interface object that represents an item of a breadcrumb.
 * <dl>
 * <dt><b>Styles:</b></dt>
 * <dd>TOGGLE,PUSH,NONE</dd>
 * <dt><b>Events:</b></dt>
 * <dd>Selection</dd>
 * </dl>
 * 
 */
public class BreadcrumbItem extends Item {

	/** The Constant MIN_WIDTH. */
	private static final int MIN_WIDTH = 40;
	
	/** The Constant MARGIN. */
	private static final int MARGIN = 4;
	
	/** The selected color. */
	private static Color SELECTED_COLOR = SWTGraphicUtil.getColorSafely(223, 220, 213);

	/** The parent breadcrumb. */
	private final Breadcrumb parentBreadcrumb;
	
	/** The selection listeners. */
	private final List<SelectionListener> selectionListeners;
	
	/** The bounds. */
	private Rectangle bounds;
	
	/** The enabled. */
	private boolean enabled;
	
	/** The selection. */
	private boolean selection;
	
	/** The width. */
	private int width;
	
	/** The height. */
	private int height;
	
	/** The disabled image. */
	private Image disabledImage;
	
	/** The selection image. */
	private Image selectionImage;
	
	/** The alignment. */
	private int alignment;
	
	/** The text color selected. */
	private Color textColorSelected;
	
	/** The text color. */
	private Color textColor;
	
	/** The tooltip text. */
	private String tooltipText;
	
	/** The gc. */
	private GC gc;
	
	/** The toolbar height. */
	private int toolbarHeight;
	
	/** The is last item of the bread crumb. */
	private boolean isLastItemOfTheBreadCrumb;

	/**
	 * Constructs a new instance of this class given its parent (which must be a
	 * <code>Breadcrumb</code>) and a style value describing its behavior and
	 * appearance. The item is added to the end of the items maintained by its
	 * parent.
	 * <p>
	 * The style value is either one of the style constants defined in class
	 * <code>SWT</code> which is applicable to instances of this class, or must
	 * be built by <em>bitwise OR</em>'ing together (that is, using the
	 * <code>int</code> "|" operator) two or more of those <code>SWT</code>
	 * style constants. The class description lists the style constants that are
	 * applicable to the class. Style bits are also inherited from superclasses.
	 * </p>
	 *
	 * @param parent a composite control which will be the parent of the new
	 *            instance (cannot be null)
	 * @see Widget#getStyle
	 * @exception IllegalArgumentException <ul>
	 *                <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
	 *                </ul>
	 * @exception SWTException <ul>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the parent</li>
	 *                <li>ERROR_INVALID_SUBCLASS - if this class is not an
	 *                allowed subclass</li>
	 *                </ul>
	 */
	public BreadcrumbItem(final Breadcrumb parent) {
		this(parent, SWT.NONE);
	}

	/**
	 * Constructs a new instance of this class given its parent (which must be a
	 * <code>Breadcrumb</code>) and a style value describing its behavior and
	 * appearance. The item is added to the end of the items maintained by its
	 * parent.
	 * <p>
	 * The style value is either one of the style constants defined in class
	 * <code>SWT</code> which is applicable to instances of this class, or must
	 * be built by <em>bitwise OR</em>'ing together (that is, using the
	 * <code>int</code> "|" operator) two or more of those <code>SWT</code>
	 * style constants. The class description lists the style constants that are
	 * applicable to the class. Style bits are also inherited from superclasses.
	 * </p>
	 *
	 * @param parent a composite control which will be the parent of the new
	 *            instance (cannot be null)
	 * @param style the style of control to construct
	 * @see Widget#getStyle
	 * @exception IllegalArgumentException <ul>
	 *                <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
	 *                </ul>
	 * @exception SWTException <ul>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the parent</li>
	 *                <li>ERROR_INVALID_SUBCLASS - if this class is not an
	 *                allowed subclass</li>
	 *                </ul>
	 */
	public BreadcrumbItem(final Breadcrumb parent, final int style) {
		super(parent, checkStyle(style));
		parent.addItem(this);
		this.parentBreadcrumb = parent;
		this.textColor = parent.getDisplay().getSystemColor(SWT.COLOR_BLACK);
		this.textColorSelected = parent.getDisplay().getSystemColor(SWT.COLOR_BLACK);
		this.enabled = true;

		if ((style & SWT.LEFT) != 0) {
			this.alignment = SWT.LEFT;
		}
		if ((style & SWT.CENTER) != 0) {
			this.alignment = SWT.CENTER;
		}
		if ((style & SWT.RIGHT) != 0) {
			this.alignment = SWT.RIGHT;
		}

		this.selectionListeners = new ArrayList<SelectionListener>();
		this.width = this.height = -1;
	}

	/**
	 * Check style.
	 *
	 * @param style the style
	 * @return the int
	 */
	private static int checkStyle(int style) {
		style = checkBits(style, SWT.NONE, SWT.PUSH, SWT.TOGGLE);
		if ((style & (SWT.PUSH | SWT.TOGGLE)) != 0) {
			return checkBits(style, SWT.CENTER, SWT.LEFT, SWT.RIGHT);
		}
		return style;
	}

	/**
	 * Check bits.
	 *
	 * @param style the style
	 * @param int0 the int0
	 * @param int1 the int1
	 * @param int2 the int2
	 * @return the int
	 */
	private static int checkBits(int style, final int int0, final int int1, final int int2) {
		final int mask = int0 | int1 | int2;
		if ((style & mask) == 0) {
			style |= int0;
		}
		if ((style & int0) != 0) {
			style = (style & ~mask) | int0;
		}
		if ((style & int1) != 0) {
			style = (style & ~mask) | int1;
		}
		if ((style & int2) != 0) {
			style = (style & ~mask) | int2;
		}
		return style;
	}

	/**
	 * Adds the listener to the collection of listeners who will be notified
	 * when the control is selected by the user, by sending it one of the
	 * messages defined in the <code>SelectionListener</code> interface.
	 * <p>
	 * <code>widgetDefaultSelected</code> is not called.
	 * </p>
	 *
	 * @param listener the listener which should be notified when the control is
	 *            selected by the user,
	 * @see SelectionListener
	 * @see #removeSelectionListener
	 * @see SelectionEvent
	 * @exception IllegalArgumentException <ul>
	 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
	 *                </ul>
	 * @exception SWTException <ul>
	 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
	 *                disposed</li>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the receiver</li>
	 *                </ul>
	 */
	public void addSelectionListener(final SelectionListener listener) {
		checkWidget();
		if (listener == null) {
			SWT.error(SWT.ERROR_NULL_ARGUMENT);
		}
		this.selectionListeners.add(listener);
	}

	/**
	 * Dispose.
	 *
	 * @see org.eclipse.swt.widgets.Widget#dispose()
	 */
	@Override
	public void dispose() {
		getParent().removeItem(this);
		this.bounds = null;
		this.disabledImage = null;
		this.selectionImage = null;
		this.textColor = null;
		this.textColorSelected = null;
		super.dispose();
	}

	/**
	 * Returns a value which describes the position of the text in the receiver. 
	 * The value will be one of <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>.
	 * 
	 * @return the alignment
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public int getAlignment() {
		checkWidget();
		return this.alignment;
	}

	/**
	 * Returns a rectangle describing the receiver's size and location relative to its parent 
	 * (or its display if its parent is null), unless the receiver is a shell. 
	 * In this case, the location is relative to the display.
	 * 
	 * @return the receiver's bounding rectangle
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public Rectangle getBounds() {
		checkWidget();
		return this.bounds;
	}

	/**
	 * Gets the disabled image.
	 *
	 * @return the image displayed when the button is disabled
	 * @exception SWTException <ul>
	 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
	 *                disposed</li>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the receiver</li>
	 *                </ul>
	 */
	public Image getDisabledImage() {
		checkWidget();
		return this.disabledImage;
	}

	/**
	 * Returns <code>true</code> if the receiver is enabled, and
	 * <code>false</code> otherwise. A disabled control is typically not
	 * selectable from the user interface and draws with an inactive or "grayed"
	 * look.
	 *
	 * @return the receiver's enabled state
	 * @see #isEnabled
	 * @exception SWTException <ul>
	 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
	 *                disposed</li>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the receiver</li>
	 *                </ul>
	 */
	public boolean getEnabled() {
		checkWidget();
		return this.enabled;
	}

	/**
	 * Returns the whole height of the item.
	 * 
	 * @return the receiver's height
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public int getHeight() {
		checkWidget();
		if (this.height == -1) {
			return computeDefaultSize().y;
		}
		return this.height;
	}

	/**
	 * Compute default size.
	 *
	 * @return the default size of the item
	 */
	private Point computeDefaultSize() {
		final Point sizeOfTextAndImages = computeSizeOfTextAndImages();
		return new Point(2 * MARGIN + sizeOfTextAndImages.x, 2 * MARGIN + sizeOfTextAndImages.y);
	}

	/**
	 * Returns the receiver's parent, which must be a <code>Breadcrumb</code>.
	 * 
	 * @return the receiver's parent
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public Breadcrumb getParent() {
		checkWidget();
		return this.parentBreadcrumb;
	}

	/**
	 * Returns <code>true</code> if the receiver is selected, and false otherwise.
	 * 
	 * @return the selection state
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public boolean getSelection() {
		checkWidget();
		return this.selection;
	}

	/**
	 * Gets the selection image.
	 *
	 * @return the image displayed when the button is selected
	 * @exception SWTException <ul>
	 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
	 *                disposed</li>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the receiver</li>
	 *                </ul>
	 */
	public Image getSelectionImage() {
		checkWidget();
		return this.selectionImage;
	}

	/**
	 * Returns the color of the text when the button is enabled and not selected.
	 * 
	 * @return the receiver's text color
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public Color getTextColor() {
		checkWidget();
		return this.textColor;
	}

	/**
	 * Returns the color of the text when the button is not selected.
	 * 
	 * @return the receiver's text color
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */

	public Color getTextColorSelected() {
		checkWidget();
		return this.textColorSelected;
	}

	/**
	 * Returns the receiver's tool tip text, or null if it has not been set.
	 * 
	 * @return the receiver's tool tip text
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public String getTooltipText() {
		checkWidget();
		return this.tooltipText;
	}

	/**
	 * Returns the whole width of the item.
	 * 
	 * @return the receiver's height
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public int getWidth() {
		checkWidget();
		if (this.width == -1) {
			return Math.max(computeDefaultSize().x, MIN_WIDTH);
		}
		return Math.max(this.width, MIN_WIDTH);
	}

	/**
	 * Returns <code>true</code> if the receiver is enabled, and
	 * <code>false</code> otherwise. A disabled control is typically not
	 * selectable from the user interface and draws with an inactive or "grayed"
	 * look.
	 *
	 * @return the receiver's enabled state
	 * @see #getEnabled
	 * @exception SWTException <ul>
	 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
	 *                disposed</li>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the receiver</li>
	 *                </ul>
	 */
	public boolean isEnabled() {
		checkWidget();
		return this.enabled;
	}

	/**
	 * Removes the listener from the collection of listeners who will be
	 * notified when the control is selected by the user.
	 *
	 * @param listener the listener which should no longer be notified
	 * @see SelectionListener
	 * @see #addSelectionListener
	 * @exception IllegalArgumentException <ul>
	 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
	 *                </ul>
	 * @exception SWTException <ul>
	 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
	 *                disposed</li>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the receiver</li>
	 *                </ul>
	 */
	public void removeSelectionListener(final SelectionListener listener) {
		checkWidget();
		if (listener == null) {
			SWT.error(SWT.ERROR_NULL_ARGUMENT);
		}
		this.selectionListeners.remove(listener);
	}

	/**
	 * Controls how text will be displayed in the receiver. The argument should 
	 * be one of <code>LEFT</code>, <code>RIGHT</code> or <code>CENTER</code>.
	 * 
	 * @param alignment the new alignment
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setAlignment(final int alignment) {
		checkWidget();
		this.alignment = alignment;
	}

	/**
	 * Sets the receiver's size and location to the rectangular area specified
	 * by the argument. The <code>x</code> and <code>y</code> fields of the
	 * rectangle are relative to the receiver's parent (or its display if its
	 * parent is null).
	 * <p>
	 * Note: Attempting to set the width or height of the receiver to a negative
	 * number will cause that value to be set to zero instead.
	 * </p>
	 *
	 * @param rectangle the new bounds
	 * @exception SWTException <ul>
	 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
	 *                disposed</li>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the receiver</li>
	 *                </ul>
	 */
	public void setBounds(final Rectangle rectangle) {
		checkWidget();
		if (this.bounds == null) {
			SWT.error(SWT.ERROR_NULL_ARGUMENT);
		}
		this.bounds = new Rectangle(Math.max(0, rectangle.x), //
				Math.max(0, rectangle.y), //
				Math.max(0, rectangle.width), //
				Math.max(0, rectangle.height));
	}

	/**
	 * Sets the receiver's image to the argument when this is one is disabled, which may be null indicating that no image should be displayed.
	 * 
	 * @param image the image to display on the receiver (may be null)
	 * 
	 * @exception IllegalArgumentException <ul>
	 *     <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
	 * </ul>
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setDisabledImage(final Image image) {
		checkWidget();
		this.disabledImage = image;
	}

	/**
	 * Enables the receiver if the argument is <code>true</code>, and disables it otherwise.
	 * <p>
	 * A disabled control is typically not selectable from the user interface and draws with an inactive or "grayed" look.
	 * </p>
	 * 
	 * @param enabled the new enabled state
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setEnabled(final boolean enabled) {
		checkWidget();
		this.enabled = enabled;
	}

	/**
	 * Sets the height of the receiver.
	 * <p>
	 * Note: Attempting to set the width or height of the receiver to a negative number will cause that value to be set to zero 
	 * instead.
	 * </p>
	 * @param height the new width
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setHeight(final int height) {
		checkWidget();
		this.height = Math.max(height, 0);
	}

	/**
	 * Sets the selection state of the receiver.
	 * 
	 * @param selected the new selection state
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setSelection(final boolean selected) {
		checkWidget();
		this.selection = selected;
	}

	/**
	 * Sets the receiver's image to the argument when this one is selected, which may be 
	 * null indicating that no image should be displayed.
	 * 
	 * @param image the image to display on the receiver (may be null)
	 * 
	 * @exception IllegalArgumentException <ul>
	 *     <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
	 * </ul>
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setSelectionImage(final Image image) {
		checkWidget();
		this.selectionImage = image;
	}

	/**
	 * Sets the receiver's text color to the argument, which may be null indicating that no image should be displayed.
	 * 
	 * @param textColor the text color to display on the receiver (may be null)
	 * 
	 * @exception IllegalArgumentException <ul>
	 *     <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
	 * </ul>
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setTextColor(final Color textColor) {
		checkWidget();
		this.textColor = textColor;
	}

	/**
	 * Sets the receiver's text color to the argument when this one is selected, which may be null indicating that no image should be displayed.
	 * 
	 * @param textColor the text color to display on the receiver (may be null)
	 * 
	 * @exception IllegalArgumentException <ul>
	 *     <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
	 * </ul>
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setTextColorSelected(final Color textColor) {
		checkWidget();
		this.textColorSelected = textColor;
	}

	/**
	 * Sets the receiver's tool tip text to the argument, which may be null indicating 
	 * that the default tool tip for the control will be shown. For a control that has 
	 * a default tool tip, such as the Tree control on Windows, setting the tool tip text to an
	 * empty string replaces the default, causing no tool tip text to be shown.
	 * <p>
	 * The mnemonic indicator (character '&amp;') is not displayed in a tool tip. To display 
	 * a single '&amp;' in the tool tip, the character '&amp;' can be escaped by doubling it in the string.
	 * </p>
	 * 
	 * @param string the new tool tip text (or null)
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setTooltipText(final String string) {
		checkWidget();
		this.tooltipText = (string == null ? "" : string);
	}

	/**
	 * Sets the width of the receiver.
	 * <p>
	 * Note: Attempting to set the width or height of the receiver to a negative number will cause that value to be set to zero 
	 * instead.
	 * </p>
	 * @param width the new width
	 * 
	 * @exception SWTException <ul>
	 *     <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
	 *     <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
	 * </ul>
	 */
	public void setWidth(final int width) {
		checkWidget();
		this.width = Math.max(0, width);
	}

	/**
	 * Fire selection event.
	 */
	// --------------------------------------------- Package visibility section
	void fireSelectionEvent() {
		final Event event = new Event();
		event.widget = this.parentBreadcrumb;
		event.display = getDisplay();
		event.item = this;
		event.type = SWT.Selection;
		for (final SelectionListener selectionListener : this.selectionListeners) {
			selectionListener.widgetSelected(new SelectionEvent(event));
		}
	}

	/**
	 * Draw button at position.
	 *
	 * @param x the x
	 */
	void drawButtonAtPosition(final int x) {

		if (this.selection) {
			drawBackgroundAtPosition(x);
		}
		if (!this.isLastItemOfTheBreadCrumb) {
			drawTrianglesAtPosition(x);
		}

		int xPosition = computeGap();
		final Image drawnedImage = drawImageAtPosition(x + xPosition);
		if (drawnedImage != null) {
			xPosition += drawnedImage.getBounds().width + 2 * MARGIN;
		}
		drawTextAtPosition(x + xPosition);

		this.bounds = new Rectangle(x, 0, getWidth(), this.toolbarHeight);
	}

	/**
	 * Draw background at position.
	 *
	 * @param x the x
	 */
	private void drawBackgroundAtPosition(final int x) {
		this.gc.setAdvanced(true);
		this.gc.setAntialias(SWT.ON);

		this.gc.setForeground(SELECTED_COLOR);
		this.gc.setBackground(SELECTED_COLOR);

		final boolean hasBorder = this.parentBreadcrumb.hasBorder;
		final boolean isFirst = this.parentBreadcrumb.indexOf(this) == 0;
		final int borderWidth = hasBorder ? 1 : 0;

		int leftSide;
		if (isFirst) {
			leftSide = 0;
		} else {
			leftSide = 5 + (hasBorder ? 0 : 1);
		}

		final int xUpperLeft = x + borderWidth + leftSide;
		final int yUpperLeft = borderWidth;
		final int rectWidth = getWidth() - borderWidth - leftSide - (this.isLastItemOfTheBreadCrumb && hasBorder ? 1 : 0);
		final int rectHeight = getHeight() - 2 * borderWidth;
		this.gc.fillRectangle(xUpperLeft, yUpperLeft, rectWidth, rectHeight);

		if (!isFirst) {
			this.gc.fillPolygon(new int[] { xUpperLeft - 5, yUpperLeft, //
					xUpperLeft, yUpperLeft, //
					xUpperLeft, yUpperLeft + this.toolbarHeight / 2 //
			});
			this.gc.fillPolygon(new int[] { xUpperLeft - 5, yUpperLeft + rectHeight, //
					xUpperLeft, yUpperLeft + rectHeight, //
					xUpperLeft, yUpperLeft + this.toolbarHeight / 2 //
			});

		}

		if (!this.isLastItemOfTheBreadCrumb) {
			this.gc.fillPolygon(new int[] { xUpperLeft + rectWidth, yUpperLeft + 1, //
					xUpperLeft + rectWidth, yUpperLeft + getHeight(), //
					xUpperLeft + rectWidth + 5, yUpperLeft + this.toolbarHeight / 2 //
			});
		}

		this.gc.setClipping((Rectangle) null);
	}

	/**
	 * Draw triangles at position.
	 *
	 * @param x the x
	 */
	private void drawTrianglesAtPosition(final int x) {
		this.gc.setForeground(Breadcrumb.BORDER_COLOR);
		drawTriangleAtPosition(x + getWidth());

		this.gc.setAlpha(127);
		this.gc.setForeground(Breadcrumb.BORDER_COLOR_1);
		drawTriangleAtPosition(x + getWidth() + 1);

		this.gc.setForeground(Breadcrumb.BORDER_COLOR_2);
		drawTriangleAtPosition(x + getWidth() + 2);

		this.gc.setForeground(Breadcrumb.BORDER_COLOR_3);
		drawTriangleAtPosition(x + getWidth() + 3);

		this.gc.setAlpha(255);
		if (this.parentBreadcrumb.hasBorder) {
			this.gc.setForeground(Breadcrumb.BORDER_COLOR);
			this.gc.drawLine(x + getWidth(), 0, x + getWidth() + 3, 0);
			this.gc.drawLine(x + getWidth(), this.toolbarHeight - 1, x + getWidth() + 3, this.toolbarHeight - 1);
		}
	}

	/**
	 * Draw triangle at position.
	 *
	 * @param x the x
	 */
	private void drawTriangleAtPosition(final int x) {
		this.gc.drawLine(x, 0, x + 5, this.toolbarHeight / 2);
		this.gc.drawLine(x + 5, this.toolbarHeight / 2, x, this.toolbarHeight);

	}

	/**
	 * Compute gap.
	 *
	 * @return the int
	 */
	private int computeGap() {
		final int widthOfTextAndImage = computeSizeOfTextAndImages().x;
		switch (this.alignment) {
			case SWT.CENTER:
				return (getWidth() - widthOfTextAndImage) / 2;
			case SWT.RIGHT:
				return getWidth() - widthOfTextAndImage - MARGIN;
			default:
				return MARGIN;
		}
	}

	/**
	 * Compute size of text and images.
	 *
	 * @return the point
	 */
	private Point computeSizeOfTextAndImages() {
		int width = 0, height = 0;
		final boolean textISNotEmpty = getText() != null && !getText().equals("");

		if (textISNotEmpty) {
			final GC gc = new GC(this.parentBreadcrumb);
			gc.setFont(this.parentBreadcrumb.getFont());
			final Point extent = gc.stringExtent(getText());
			gc.dispose();
			width += extent.x;
			height = extent.y;
		}

		final Point imageSize = computeMaxWidthAndHeightForImages(getImage(), this.selectionImage, this.disabledImage);

		if (imageSize.x != -1) {
			width += imageSize.x;
			height = Math.max(imageSize.y, height);
			if (textISNotEmpty) {
				width += MARGIN * 2;
			}
		}
		width += MARGIN;
		return new Point(width, height);
	}

	/**
	 * Compute max width and height for images.
	 *
	 * @param images the images
	 * @return the point
	 */
	private Point computeMaxWidthAndHeightForImages(final Image... images) {
		final Point imageSize = new Point(-1, -1);
		for (final Image image : images) {
			if (image == null) {
				continue;
			}
			final Rectangle imageBounds = image.getBounds();
			imageSize.x = Math.max(imageBounds.width, imageSize.x);
			imageSize.y = Math.max(imageBounds.height, imageSize.y);
		}
		return imageSize;
	}

	/**
	 * Draw image at position.
	 *
	 * @param xPosition the x position
	 * @return the image
	 */
	private Image drawImageAtPosition(final int xPosition) {
		Image image;
		if (!isEnabled()) {
			image = this.disabledImage;
		} else if (this.selection) {
			image = this.selectionImage;
		} else {
			image = getImage();
		}

		if (image == null) {
			return null;
		}

		final int yPosition = (this.toolbarHeight - image.getBounds().height) / 2;
		this.gc.drawImage(image, (int) (xPosition + MARGIN * 1.5), yPosition);
		return image;
	}

	/**
	 * Draw text at position.
	 *
	 * @param xPosition the x position
	 */
	private void drawTextAtPosition(final int xPosition) {
		this.gc.setFont(this.parentBreadcrumb.getFont());
		if (this.selection) {
			this.gc.setForeground(this.textColorSelected);
		} else {
			this.gc.setForeground(this.textColor);
		}

		final Point textSize = this.gc.stringExtent(getText());
		final int yPosition = (this.toolbarHeight - textSize.y) / 2;

		int padding;
		if (this.parentBreadcrumb.indexOf(this) == 0 || this.isLastItemOfTheBreadCrumb) {
			padding = 0;
		} else {
			padding = 5;
		}
		this.gc.drawText(getText(), xPosition + padding, yPosition, true);
	}

	/**
	 * Sets the gc.
	 *
	 * @param gc the gc
	 * @return the breadcrumb item
	 */
	BreadcrumbItem setGc(final GC gc) {
		this.gc = gc;
		return this;
	}

	/**
	 * Sets the toolbar height.
	 *
	 * @param toolbarHeight the toolbar height
	 * @return the breadcrumb item
	 */
	BreadcrumbItem setToolbarHeight(final int toolbarHeight) {
		this.toolbarHeight = toolbarHeight;
		return this;
	}

	/**
	 * Sets the is last item of the bread crumb.
	 *
	 * @param isLastItemOfTheBreadCrumb the is last item of the bread crumb
	 * @return the breadcrumb item
	 */
	BreadcrumbItem setIsLastItemOfTheBreadCrumb(final boolean isLastItemOfTheBreadCrumb) {
		this.isLastItemOfTheBreadCrumb = isLastItemOfTheBreadCrumb;
		return this;
	}

}