rvsnoop.ui.MultiLineToolTipUI.java Source code

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Here is the source code for rvsnoop.ui.MultiLineToolTipUI.java

Source

// Copyright: Copyright  2006-2010 Ian Phillips and rjan Lundberg.
// License:   Apache Software License (Version 2.0)
package rvsnoop.ui;

import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;

import javax.swing.JComponent;
import javax.swing.JToolTip;
import javax.swing.LookAndFeel;
import javax.swing.UIManager;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.ToolTipUI;

import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;

public final class MultiLineToolTipUI extends ToolTipUI {

    private static final int INSET = 2;

    private static final MultiLineToolTipUI INSTANCE = new MultiLineToolTipUI();

    public static void configure() {
        final String toolTipUI = MultiLineToolTipUI.class.getName();
        UIManager.put("ToolTipUI", toolTipUI);
        UIManager.put(toolTipUI, MultiLineToolTipUI.class);
    }

    public static ComponentUI createUI(JComponent c) {
        return INSTANCE;
    }

    private final Splitter splitter = Splitter.on("\n").omitEmptyStrings().trimResults();

    private MultiLineToolTipUI() {
        super();
    }

    @Override
    public Dimension getMaximumSize(JComponent c) {
        return getPreferredSize(c);
    }

    @Override
    public Dimension getMinimumSize(JComponent c) {
        return getPreferredSize(c);
    }

    @Override
    public Dimension getPreferredSize(JComponent c) {
        int w = 0, h = 0;
        final String[] lines = Iterables.toArray(splitter.split(((JToolTip) c).getTipText()), String.class);
        if (lines.length > 0) {
            final Font font = c.getFont();
            final FontMetrics fontMetrics = c.getFontMetrics(font);
            h += lines.length * fontMetrics.getHeight();
            final Graphics g = c.getGraphics();
            w = 0;
            for (int i = 0, imax = lines.length; i < imax; ++i)
                w = Math.max(w, (int) fontMetrics.getStringBounds(lines[i], g).getWidth());
        }
        return new Dimension(w + 2 * INSET, h + 2 * INSET);
    }

    @Override
    public void installUI(JComponent c) {
        LookAndFeel.installColorsAndFont(c, "ToolTip.background", "ToolTip.foreground", "ToolTip.font");
        LookAndFeel.installBorder(c, "ToolTip.border");
    }

    @Override
    public void paint(Graphics g, JComponent c) {
        final int w = c.getWidth(), h = c.getHeight();
        g.setColor(c.getBackground());
        g.fillRect(0, 0, w, h);
        g.setColor(c.getForeground());
        g.drawRect(0, 0, w, h);
        final String[] lines = Iterables.toArray(splitter.split(((JToolTip) c).getTipText()), String.class);
        if (lines.length > 0) {
            final Font font = c.getFont();
            final FontMetrics fontMetrics = c.getFontMetrics(font);
            final int fontHeight = fontMetrics.getHeight();
            int y = INSET + fontMetrics.getAscent();
            for (int i = 0, imax = lines.length; i < imax; ++i) {
                g.drawString(lines[i], INSET, y);
                y += fontHeight;
            }
        }
    }

    @Override
    public void uninstallUI(JComponent c) {
        LookAndFeel.uninstallBorder(c);
    }

}