Hier ist eine Version, die ich zuvor verwendet habe. Sie funktioniert gut, wenn Sie Ihre Tooltipps aus ResourceBundles laden:
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 java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.util.regex.Pattern;
/**
* A tooltip that wraps multi-line text.
*/
public final class MultiLineToolTipUI extends ToolTipUI {
private static final int INSET = 2;
private static final Pattern LINE_SPLITTER = Pattern.compile("$", Pattern.MULTILINE);
private static final MultiLineToolTipUI SHARED_INSTANCE = new MultiLineToolTipUI();
/**
* Install the multi-line tooltip into the UI manager.
*/
public static void installUI() {
String toolTipUI = MultiLineToolTipUI.class.getName();
UIManager.put("ToolTipUI", toolTipUI);
UIManager.put(toolTipUI, MultiLineToolTipUI.class);
}
@SuppressWarnings("UnusedDeclaration")
public static ComponentUI createUI(JComponent c) {
return SHARED_INSTANCE;
}
private MultiLineToolTipUI() {}
@Override
public Dimension getMaximumSize(JComponent c) {
return getPreferredSize(c);
}
@Override
public Dimension getMinimumSize(JComponent c) {
return getPreferredSize(c);
}
@Override
public Dimension getPreferredSize(JComponent c) {
String[] lines = LINE_SPLITTER.split(((JToolTip) c).getTipText());
if (lines.length == 0) {
return new Dimension(2 * INSET, 2 * INSET);
}
FontMetrics metrics = c.getFontMetrics(c.getFont());
Graphics g = c.getGraphics();
int w = 0;
for (String line : lines) {
w = Math.max(w, (int) metrics.getStringBounds(line, g).getWidth());
}
int h = lines.length * metrics.getHeight();
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) {
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);
String[] lines = LINE_SPLITTER.split(((JToolTip) c).getTipText());
if (lines.length != 0) {
FontMetrics metrics = c.getFontMetrics(c.getFont());
int height = metrics.getHeight();
int y = INSET + metrics.getAscent();
for (String line : lines) {
g.drawString(line, INSET, y);
y += height;
}
}
}
@Override
public void uninstallUI(JComponent c) {
LookAndFeel.uninstallBorder(c);
}
}
Und Sie würden es verwenden, indem Sie diese Methode aufrufen, bevor Ihre Benutzeroberfläche erstellt wird:
MultiLineToolTipUI.installUI();
Fügen Sie dann in Ihre Eigenschaftendateien einfach Zeilenumbrüche ein, um Ihre QuickInfos wie gewünscht zu verpacken.