org.eclipse.graphiti.ui.internal.util.draw2d.Tooltip.java Source code

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Here is the source code for org.eclipse.graphiti.ui.internal.util.draw2d.Tooltip.java

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/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2005, 2016 SAP AG.
 * 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:
 *    SAP AG - initial API, implementation and documentation
 *    mwenz - Bug 373298 - Possible Resource leaks in Graphiti
 *    apupier - Bug 508133 - Use FontRegistry for Tooltip
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.graphiti.ui.internal.util.draw2d;

import org.eclipse.draw2d.Border;
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.MarginBorder;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.text.FlowPage;
import org.eclipse.draw2d.text.TextFlow;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.graphics.Font;

/**
 * @noinstantiate This class is not intended to be instantiated by clients.
 * @noextend This class is not intended to be subclassed by clients.
 */
public class Tooltip extends FlowPage {

    private static final int TOOLTIP_MAX_WIDTH = 250;
    private static final Border TOOLTIP_BORDER = new MarginBorder(0, 2, 1, 2);

    private TextFlow header;
    private TextFlow description;
    private String headerText;
    private String descriptionText;

    public Tooltip() {
        setForegroundColor(GFColorConstants.TOOLTIP_FG);
        setBackgroundColor(GFColorConstants.TOOLTIP_BG);
        setOpaque(true);
        setBorder(TOOLTIP_BORDER);

        header = new TextFlow();
        header.setForegroundColor(ColorConstants.darkGray);
        header.setFont(getBoldFont());
        add(header);

        description = new TextFlow();
        description.setForegroundColor(ColorConstants.darkGray);
        add(description);
    }

    public void setHeader(String text) {
        headerText = text;
        adjustTexts();
    }

    public void setDescription(String text) {
        descriptionText = text;
        adjustTexts();
    }

    private void adjustTexts() {
        description.setText(descriptionText);
        if (headerText != null && descriptionText != null) {
            // needs extra line-break
            header.setText(headerText + "\n"); //$NON-NLS-1$
        } else {
            header.setText(headerText);
        }
    }

    @Override
    public Dimension getPreferredSize(int w, int h) {
        Dimension d = super.getPreferredSize(-1, -1);
        if (d.width > TOOLTIP_MAX_WIDTH)
            d = super.getPreferredSize(TOOLTIP_MAX_WIDTH, -1);
        return d;
    }

    private Font getBoldFont() {
        return JFaceResources.getFontRegistry().getBold(JFaceResources.DEFAULT_FONT);
    }
}