#rounded borders in jtooltip

10 messages · Page 1 of 1 (latest)

finite remnant
#

hi! i'm trying to customize my program gui (using only java swing) and i'm currently dealing with tooltips. since everything in my program has rounded corners, i wanted the tooltips to have also rounded corners. i tried a lot of things but i can't make it work. the rounded rectangle is drawn perfectly but there are 4 white corners that i can't get rid of (as you can see in the attached picture) even setting the transparency with AlphaComposite.Clear and i'm running out of ideas

this is a custom dummy class i made to test things until i can find the solution:

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;

public class CustomTooltip extends JToolTip {

  private final Color backgroundColor;
  private final Color foregroundColor;

  public CustomTooltip(JComponent component, Color backgroundColor, Color foregroundColor) {
    super();
    setComponent(component);
    this.backgroundColor = backgroundColor;
    this.foregroundColor = foregroundColor;
    setOpaque(false);
    setBorder(new EmptyBorder(5, 10, 5, 10));
  }

  @Override
  protected void paintComponent(Graphics g) {
    Graphics2D g2d = (Graphics2D) g.create();
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

    // transparency
    g2d.setComposite(AlphaComposite.Clear);
    g2d.fillRect(0, 0, getWidth(), getHeight());
    g2d.setComposite(AlphaComposite.SrcOver);

    // rounded rectangle
    g2d.setColor(backgroundColor);
    g2d.fillRoundRect(0, 0, getWidth(), getHeight(), 15, 15);

    // text
    g2d.setColor(foregroundColor);
    FontMetrics fm = g.getFontMetrics();
    int x = 10; // text position
    int y = fm.getAscent() + 5;
    g2d.drawString(getTipText(), x, y);

    g2d.dispose();
  }
}

any ideas or recommendations are very helpful! thank you in advance

image.png
tiny roostBOT
#

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tiny roostBOT
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tiny roostBOT
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tiny roostBOT
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ember topaz
#

So you want to use Graphics2D to create a rectangle with rounded corners?

#

but ofc with both sides