bundles/org.eclipse.jface/src/org/eclipse/jface/window/DefaultToolTip.java

/*******************************************************************************
 * Copyright (c) 2006, 2007 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
 *******************************************************************************/

package org.eclipse.jface.window;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;

/**
 * Default implementation of ToolTip that provides an iconofied label with font
 * and color controls by subclass.
 * 
 * @since 3.3
 */
public class DefaultToolTip extends ToolTip {
	private String text;

	private Color backgroundColor;

	private Font font;

	private Image backgroundImage;

	private Color foregroundColor;

	private Image image;

	private int style = SWT.SHADOW_NONE;

	/**
	 * Create new instance which add TooltipSupport to the widget
	 * 
	 * @param control the control on whose action the tooltip is shown
	 */
	public DefaultToolTip(Control control) {
		super(control);
	}

	/**
	 * Create new instance which add TooltipSupport to the widget
	 * 
	 * @param control the control to which the tooltip is bound
	 * @param style style passed to control tooltip behaviour
	 * @param manualActivation <code>true</code> if the activation is done manually using
	 *            {@link #show(Point)}
	 * @see #RECREATE
	 * @see #NO_RECREATE
	 */
	public DefaultToolTip(Control control, int style, boolean manualActivation) {
		super(control, style, manualActivation);
	}
	
	/**
	 * Creates the content are of the the tooltip. By default this creates a
	 * CLabel to display text. To customize the text Subclasses may override the
	 * following methods
	 * <ul>
	 * <li>{@link #getStyle(Event)}</li>
	 * <li>{@link #getBackgroundColor(Event)}</li>
	 * <li>{@link #getForegroundColor(Event)}</li>
	 * <li>{@link #getFont(Event)}</li>
	 * <li>{@link #getImage(Event)}</li>
	 * <li>{@link #getText(Event)}</li>
	 * <li>{@link #getBackgroundImage(Event)}</li>
	 * </ul>
	 * 
	 * @param event
	 *            the event that triggered the activation of the tooltip
	 * @param parent
	 *            the parent of the content area
	 * @return the content area created
	 */
	protected Composite createToolTipContentArea(Event event, Composite parent) {
		Image image = getImage(event);
		Image bgImage = getBackgroundImage(event);
		String text = getText(event);
		Color fgColor = getForegroundColor(event);
		Color bgColor = getBackgroundColor(event);
		Font font = getFont(event);

		CLabel label = new CLabel(parent, getStyle(event));
		if (text != null) {
			label.setText(text);
		}

		if (image != null) {
			label.setImage(image);
		}

		if (fgColor != null) {
			label.setForeground(fgColor);
		}

		if (bgColor != null) {
			label.setBackground(bgColor);
		}

		if (bgImage != null) {
			label.setBackgroundImage(image);
		}

		if (font != null) {
			label.setFont(font);
		}

		return label;
	}

	/**
	 * The style used to create the {@link CLabel} in the default implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip
	 * @return the style
	 */
	protected int getStyle(Event event) {
		return style;
	}

	/**
	 * The {@link Image} displayed in the {@link CLabel} in the default
	 * implementation implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip
	 * @return the {@link Image} or <code>null</code> if no image should be
	 *         displayed
	 */
	protected Image getImage(Event event) {
		return image;
	}

	/**
	 * The foreground {@link Color} used by {@link CLabel} in the default
	 * implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip
	 * @return the {@link Color} or <code>null</code> if default foreground
	 *         color should be used
	 */
	protected Color getForegroundColor(Event event) {
		return (foregroundColor == null) ? event.widget.getDisplay()
				.getSystemColor(SWT.COLOR_INFO_FOREGROUND) : foregroundColor;
	}

	/**
	 * The background {@link Color} used by {@link CLabel} in the default
	 * implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip
	 * @return the {@link Color} or <code>null</code> if default background
	 *         color should be used
	 */
	protected Color getBackgroundColor(Event event) {
		return (backgroundColor == null) ? event.widget.getDisplay()
				.getSystemColor(SWT.COLOR_INFO_BACKGROUND) : backgroundColor;
	}

	/**
	 * The background {@link Image} used by {@link CLabel} in the default
	 * implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip
	 * @return the {@link Image} or <code>null</code> if no image should be
	 *         displayed in the background
	 */
	protected Image getBackgroundImage(Event event) {
		return backgroundImage;
	}

	/**
	 * The {@link Font} used by {@link CLabel} in the default implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip
	 * @return the {@link Font} or <code>null</code> if the default font
	 *         should be used
	 */
	protected Font getFont(Event event) {
		return font;
	}

	/**
	 * The text displayed in the {@link CLabel} in the default implementation
	 * 
	 * @param event
	 *            the event triggered the popup of the tooltip
	 * @return the text or <code>null</code> if no text has to be displayed
	 */
	protected String getText(Event event) {
		return text;
	}

	/**
	 * The background {@link Image} used by {@link CLabel} in the default
	 * implementation
	 * 
	 * @param backgroundColor
	 *            the {@link Color} or <code>null</code> if default background
	 *            color ({@link SWT#COLOR_INFO_BACKGROUND}) should be used
	 */
	public void setBackgroundColor(Color backgroundColor) {
		this.backgroundColor = backgroundColor;
	}

	/**
	 * The background {@link Image} used by {@link CLabel} in the default
	 * implementation
	 * 
	 * @param backgroundImage
	 *            the {@link Image} or <code>null</code> if no image should be
	 *            displayed in the background
	 */
	public void setBackgroundImage(Image backgroundImage) {
		this.backgroundImage = backgroundImage;
	}

	/**
	 * The {@link Font} used by {@link CLabel} in the default implementation
	 * 
	 * @param font
	 *            the {@link Font} or <code>null</code> if the default font
	 *            should be used
	 */
	public void setFont(Font font) {
		this.font = font;
	}

	/**
	 * The foreground {@link Color} used by {@link CLabel} in the default
	 * implementation
	 * 
	 * @param foregroundColor
	 *            the {@link Color} or <code>null</code> if default foreground
	 *            color should be used
	 */
	public void setForegroundColor(Color foregroundColor) {
		this.foregroundColor = foregroundColor;
	}

	/**
	 * The {@link Image} displayed in the {@link CLabel} in the default
	 * implementation implementation
	 * 
	 * @param image
	 *            the {@link Image} or <code>null</code> if no image should be
	 *            displayed
	 */
	public void setImage(Image image) {
		this.image = image;
	}

	/**
	 * The style used to create the {@link CLabel} in the default implementation
	 * 
	 * @param style
	 *            the event triggered the popup of the tooltip
	 */
	public void setStyle(int style) {
		this.style = style;
	}

	/**
	 * The text displayed in the {@link CLabel} in the default implementation
	 * 
	 * @param text
	 *            the text or <code>null</code> if no text has to be displayed
	 */
	public void setText(String text) {
		this.text = text;
	}

}