带有背景图像的JTextArea的内部填充 [英] Internal padding for JTextArea with background Image
本文介绍了带有背景图像的JTextArea的内部填充的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我的最终目标是使用背景图片获得 JTextArea
。我发现在线代码向我展示了如何做到这一点,但现在我遇到了图像顶部的文本问题。
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 being on top of the image.
这就是我的意思:
有什么方法可以添加一种向内缩进,使文本不与图像的边缘重叠?
Is there any way I can add a sort of inward indent so that the text is not overlapping the edges of the image?
以下是原始评论气泡图片。
Here is the raw comment bubble image.
以下是代码:
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Image;
import javax.swing.GrayFilter;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class myBackgroundSample {
String file;
public myBackgroundSample(String i) {
file = i;
setItUp();
}
public void setItUp() {
final ImageIcon imageIcon = new ImageIcon(file);
JTextArea textArea = new JTextArea() {
Image image = imageIcon.getImage();
public void paint(Graphics g) {
setOpaque(false);
g.drawImage(image, 0, 0, this);
super.paint(g);
}
};
JFrame frame = new JFrame("Background Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane scrollPane = new JScrollPane(textArea);
Container content = frame.getContentPane();
content.add(scrollPane, BorderLayout.CENTER);
frame.setSize(400, 400);
frame.setVisible(true);
}
public static void main(String[] args) {
// TODO Auto-generated method stub
String right = "chat1.jpg";
myBackgroundSample temp = new myBackgroundSample(right);
}
}
推荐答案
使用扩展的自定义边框 AbstractBorder中
。这样的事情:
Use a custom border that extends AbstractBorder
. Something like this:
获得确切的形状&颜色留给读者练习。 :)
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);
}
});
}
}
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