[英]JTextArea Rounded Corners
I want to make JTextArea has a rounded corners, and i did this code : 我想使JTextArea具有圆角,并且我执行了以下代码:
public BPosTxtArea() {
super();
setOpaque(false);
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(getBackground());
g2.fillRoundRect(0, 0, getWidth() - 1, getHeight() - 1, 15, 15);
super.paintComponent(g);
}
@Override
protected void paintBorder(Graphics g) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(new Color(102, 102, 102));
g2.drawRoundRect(0, 0, getWidth() - 1, getHeight() - 1, 15, 15);
}
but it still has a square border outside like picture bellow : 但是它的外部仍然有一个方形的边框,如下面的波纹管
Can anyone help me? 谁能帮我?
Start by having a look at How to Use Borders 首先看一下如何使用边框
This is a very simple example: 这是一个非常简单的示例:
public class RoundBorder implements Border {
private int radius;
public RoundBorder(int radius) {
this.radius = radius;
}
public int getRadius() {
return radius;
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.draw(new RoundRectangle2D.Double(x, y, width - 1, height - 1, getRadius(), getRadius()));
g2d.dispose();
}
@Override
public Insets getBorderInsets(Component c) {
int value = getRadius() / 2;
return new Insets(value, value, value, value);
}
@Override
public boolean isBorderOpaque() {
return false;
}
}
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.Border;
public class Example {
public static void main(String[] args) {
new Example();
}
public Example() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
JTextArea ta = new JTextArea(10, 20);
ta.setBorder(new RoundBorder(20));
JScrollPane sp = new JScrollPane(new JTextArea(10, 20));
sp.setBorder(new RoundBorder(20));
add(ta, gbc);
add(sp, gbc);
}
}
public class RoundBorder implements Border {
private int radius;
public RoundBorder(int radius) {
this.radius = radius;
}
public int getRadius() {
return radius;
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.draw(new RoundRectangle2D.Double(x, y, width - 1, height - 1, getRadius(), getRadius()));
g2d.dispose();
}
@Override
public Insets getBorderInsets(Component c) {
int value = getRadius() / 2;
return new Insets(value, value, value, value);
}
@Override
public boolean isBorderOpaque() {
return false;
}
}
}
Problems, the border is painted "within" the component fill area, meaning that the corners will be the same color as the fill area. 问题是,边框在组件填充区域的内部绘制,这意味着角与填充区域的颜色相同。 There's no way around it using Border
. 使用Border
它。
The trick would be to create a second component, onto which you could paint the border (via the paintComponent
, filling the area within the border the same color as the text area) and then add the component into that. 诀窍是创建第二个组件,您可以在其上绘制边框(通过paintComponent
,用与文本区域相同的颜色填充边框内的区域),然后将其添加到该组件中。
Updated 更新
Based on you code example, you're not overriding getInsets
, which is going to be very important, the other thing is, it appears that your JTextArea
is within a JScrollPane
... 根据您的代码示例,您不会覆盖getInsets
,这将是非常重要的,另一件事是,您的JTextArea
似乎在JScrollPane
...
public class BPosTextArea extends JTextArea {
private int radius;
public BPosTextArea() {
super(10, 20);
setOpaque(false);
setBorder(null);
setRadius(20);
}
@Override
protected void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(getBackground());
g2.fillRoundRect(0, 0, getWidth() - 1, getHeight() - 1, getRadius(), getRadius());
super.paintComponent(g);
}
@Override
protected void paintBorder(Graphics g) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(new Color(102, 102, 102));
g2.drawRoundRect(0, 0, getWidth() - 1, getHeight() - 1, getRadius(), getRadius());
}
public void setRadius(int radius) {
this.radius = radius;
repaint();
}
public int getRadius() {
return radius;
}
@Override
public Insets getInsets() {
int value = getRadius() / 2;
return new Insets(value, value, value, value);
}
}
A solution is to set the border
to null
for the JScrollPane
一种解决方案是将JScrollPane
的border
设置为null
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