我正在尝试使用Java Swing制作聊天应用程序,但聊天气泡遇到了麻烦.我设法做起泡的部分,但似乎无法正确放置它们.这是我的代码
package messagebubble;
import java.awt.BorderLayout;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import messagebubble.RoundedBorder;
public class Main {
public static void main(String[] args) {
JFrame window = new JFrame();
JPanel chat = new JPanel();
chat.setLayout(new BoxLayout(chat, BoxLayout.PAGE_AXIS));
JPanel painel = new JPanel(new BorderLayout());
JPanel painel2 = new JPanel(new BorderLayout());
JTextArea msg = new JTextArea();
msg.setLineWrap(true);
msg.setWrapStyleWord(true);
msg.setText("ola tudo bem meus caros amigos, como estão? há muito que não vos via por estas bandas haha lol");
msg.setBorder(new RoundedBorder());
msg.setColumns(msg.getLineCount());
JTextArea msg2 = new JTextArea();
msg2.setLineWrap(true);
msg2.setWrapStyleWord(true);
msg2.setText("ola tudo bem");
msg2.setBorder(new RoundedBorder());
painel.add(msg,BorderLayout.NORTH);
chat.add(painel);
painel2.add(msg2,BorderLayout.NORTH);
chat.add(painel2);
window.add(chat);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setSize(400, 500);
window.setVisible(true);
}
}
这是圆形边框
package GUI;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.geom.Area;
import java.awt.geom.Rectangle2D;
import java.awt.geom.RoundRectangle2D;
import javax.swing.border.AbstractBorder;
public class RoundedBorder extends AbstractBorder {
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width,
int height) {
Graphics2D graph = (Graphics2D) g.create();
RoundRectangle2D round = new RoundRectangle2D.Float(x, y, width - 1,
height - 1, 30, 30);
Container parent = c.getParent();
if (parent != null) {
graph.setColor(parent.getBackground());
Area canto = new Area(new Rectangle2D.Float(x,y,width,height));
canto.subtract(new Area(round));
graph.fill(canto);
}
graph.setColor(Color.GRAY);
graph.draw(round);
graph.dispose();
}
@Override
public Insets getBorderInsets(Component c) {
return new Insets(5, 10, 5, 10);
}
@Override
public Insets getBorderInsets(Component c, Insets insets) {
insets.left = 10;
insets.right = insets.left;
insets.top = 5;
insets.bottom = insets.top;
return insets;
}
}
输出看起来像这样Output.我无法摆脱消息之间的空白或底部JTextArea中的空白.
我还尝试将面板的最大尺寸设置为他们喜欢的尺寸,看起来像是太窄的Output2.
知道我该如何解决吗?我想要达到的是这样的ideal
解决方法:
我会推荐
>使用单个BorderLayout容纳所有组件
>让它在BorderLayout.PAGE_START位置容纳另一个使用BoxLayout PAGE_AXIS的JPanel.
>将您的聊天添加到BoxLayout JPanel.
>请注意,我们大多数人都没有圆角矩形边框实用程序,因此无法对此进行测试.
例如:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.*;
public class MainPanel extends JPanel {
private static final int PREF_W = 400;
private static final int PREF_H = 500;
private JPanel msgHoldingPanel = new JPanel();
public MainPanel() {
JTextArea msg = new JTextArea();
msg.setLineWrap(true);
msg.setWrapStyleWord(true);
msg.setText("ola tudo bem meus caros amigos, como estão? há muito que não vos via por estas bandas haha lol");
// !! msg.setBorder(new RoundedBorder());
msg.setBorder(BorderFactory.createLineBorder(Color.blue));
msg.setColumns(msg.getLineCount());
JTextArea msg2 = new JTextArea();
msg2.setLineWrap(true);
msg2.setWrapStyleWord(true);
msg2.setText("ola tudo bem");
msg2.setBorder(BorderFactory.createLineBorder(Color.blue));
msgHoldingPanel.setLayout(new BoxLayout(msgHoldingPanel, BoxLayout.PAGE_AXIS));
msgHoldingPanel.add(msg);
msgHoldingPanel.add(Box.createVerticalStrut(3));
msgHoldingPanel.add(msg2);
setLayout(new BorderLayout());
add(msgHoldingPanel, BorderLayout.PAGE_START);
}
@Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private static void createAndShowGui() {
JFrame frame = new JFrame("MainPanel");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new MainPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}