My ultimate goal is to have a JTextArea
with a background image. I found code online that showed me how to do this, but now I\'m having an issue with the text b
You should use an Border
for that, more specifictly you should use BorderFactory.createEmptyBorder(int top, int left, int bottom, int right):
textArea.setBorder(BorderFactory.createEmptyBorder(10,10,15,10));
You should also override paintComponent
instead of paint
. Also, use setRows()
and setColumns()
to set the size of the textArea, then you can use pack()
instead of setSize(400,400)
which is not recommended. See this example:
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class Test extends JFrame {
class MyTextArea extends JTextArea {
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setColor(Color.PINK);
g2.setStroke(new BasicStroke(4));
g2.drawRoundRect(3, 3, getWidth()-7, getHeight()-7, 5, 5);
}
}
public Test() {
JPanel panel = new JPanel(new BorderLayout());
JTextArea textArea = new MyTextArea();
textArea.setRows(3);
textArea.setColumns(25);
textArea.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
panel.add(textArea, BorderLayout.NORTH);
add(panel);
pack();
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String[] args) {
new Test();
}
}
Use a custom border that extends AbstractBorder. Something like this:
Getting the exact shape & color is left as an exercise for the reader. :)
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.border.AbstractBorder;
class TextBubbleBorder extends AbstractBorder {
private Color color;
private int thickness = 4;
private int radii = 8;
private int pointerSize = 7;
private Insets insets = null;
private BasicStroke stroke = null;
private int strokePad;
private int pointerPad = 4;
RenderingHints hints;
TextBubbleBorder(
Color color) {
new TextBubbleBorder(color, 4, 8, 7);
}
TextBubbleBorder(
Color color, int thickness, int radii, int pointerSize) {
this.thickness = thickness;
this.radii = radii;
this.pointerSize = pointerSize;
this.color = color;
stroke = new BasicStroke(thickness);
strokePad = thickness/2;
hints = new RenderingHints(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
int pad = radii + strokePad;
int bottomPad = pad + pointerSize + strokePad;
insets = new Insets(pad,pad,bottomPad,pad);
}
@Override
public Insets getBorderInsets(Component c) {
return insets;
}
@Override
public Insets getBorderInsets(Component c, Insets insets) {
return getBorderInsets(c);
}
@Override
public void paintBorder(
Component c,
Graphics g,
int x, int y,
int width, int height) {
Graphics2D g2 = (Graphics2D)g;
int bottomLineY = height-thickness-pointerSize;
RoundRectangle2D.Double bubble = new RoundRectangle2D.Double(
0+strokePad,
0+strokePad,
width-thickness,
bottomLineY,
radii,
radii
);
Polygon pointer = new Polygon();
// left point
pointer.addPoint(
strokePad+radii+pointerPad,
bottomLineY);
// right point
pointer.addPoint(
strokePad+radii+pointerPad+pointerSize,
bottomLineY);
// bottom point
pointer.addPoint(
strokePad+radii+pointerPad+(pointerSize/2),
height-strokePad);
Area area = new Area(bubble);
area.add(new Area(pointer));
g2.setRenderingHints(hints);
Area spareSpace = new Area(new Rectangle(0,0,width,height));
spareSpace.subtract(area);
g2.setClip(spareSpace);
g2.clearRect(0,0,width,height);
g2.setClip(null);
g2.setColor(color);
g2.setStroke(stroke);
g2.draw(area);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JLabel l = new JLabel(
"The quick brown fox jumped over the lazy dog!");
l.setBorder(new TextBubbleBorder(Color.MAGENTA.darker(),2,4,0));
l.setOpaque(true);
l.setBackground(Color.BLACK);
JOptionPane.showMessageDialog(null, l);
}
});
}
}
A better version of TextBubbleBorder.
https://gist.github.com/wenerme/6940534
To post code, indent every line by four spaces.
I assume you are overriding paintComponent()
* for your JTextArea
. If you are, make sure that it is transparent by adding
setOpaque(false);
*This also works if you override paint()
, but as trashgod correctly states, that would interfere with paintBorder()
.