主要问题：在带有JPanel且包含JTextArea的JScrollPane中，如果GUI展开，则文本将自动换行，而GUI收缩时，文本将不会回退。见下面的例子
好的，我正在为当前正在使用的应用程序构建GUI，但遇到了一些问题。
说明：我的GUI的结构如下图所示：
这就是它的样子。
扩展后，panelWithText内的JTextArea会扩展并调整文本大小，如下所示：
但是问题是当您缩小GUI时会发生什么。 “问题”是我希望文本像以前一样弯曲。我通过对ComponentListener和JScrollPane都实现了panelWithText进行了一些实验，发现在扩展时为componentResized调用了panelWithText，但没有收缩。有什么方法可以在panelWithText组件中实现文本变形的行为？
PS：显然，如果我用常规的JScrollPane切换JPanel，它会起作用。但是我做不到！我有很多panelWithText可以显示给用户。
PS PS：对不起，这是我正在使用的代码。
JFrameExt.java
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JScrollPane;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.FlowLayout;
import java.awt.Window.Type;
import javax.swing.ScrollPaneConstants;
import java.awt.CardLayout;
import com.jgoodies.forms.layout.FormLayout;
import com.jgoodies.forms.layout.ColumnSpec;
import com.jgoodies.forms.layout.RowSpec;
import com.jgoodies.forms.factories.FormFactory;
public class JFrameExt extends JFrame {
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrameExt frame = new JFrameExt();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public JFrameExt() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 246, 164);
contentPane = new JPanel();
contentPane.setBorder(null);
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportBorder(null);
scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
contentPane.add(scrollPane, BorderLayout.CENTER);
JPanel panel = new JPanel();
scrollPane.setViewportView(panel);
GridBagLayout gbl_panel = new GridBagLayout();
gbl_panel.columnWidths = new int[]{0, 0};
gbl_panel.rowHeights = new int[]{0, 0, 0, 0, 0, 0, 0, 0};
gbl_panel.columnWeights = new double[]{1.0, Double.MIN_VALUE};
gbl_panel.rowWeights = new double[]{0.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, Double.MIN_VALUE};
panel.setLayout(gbl_panel);
panelWithText panelWithText_ = new panelWithText();
GridBagConstraints gbc_panelWithText_ = new GridBagConstraints();
gbc_panelWithText_.anchor = GridBagConstraints.NORTH;
gbc_panelWithText_.insets = new Insets(0, 0, 5, 0);
gbc_panelWithText_.fill = GridBagConstraints.HORIZONTAL;
gbc_panelWithText_.gridx = 0;
gbc_panelWithText_.gridy = 0;
panel.add(panelWithText_, gbc_panelWithText_);
panelWithText panelWithText__1 = new panelWithText();
GridBagConstraints gbc_panelWithText__1 = new GridBagConstraints();
gbc_panelWithText__1.insets = new Insets(0, 0, 5, 0);
gbc_panelWithText__1.anchor = GridBagConstraints.NORTH;
gbc_panelWithText__1.fill = GridBagConstraints.HORIZONTAL;
gbc_panelWithText__1.gridx = 0;
gbc_panelWithText__1.gridy = 1;
panel.add(panelWithText__1, gbc_panelWithText__1);
panelWithText panelWithText__2 = new panelWithText();
GridBagConstraints gbc_panelWithText__2 = new GridBagConstraints();
gbc_panelWithText__2.insets = new Insets(0, 0, 5, 0);
gbc_panelWithText__2.fill = GridBagConstraints.BOTH;
gbc_panelWithText__2.gridx = 0;
gbc_panelWithText__2.gridy = 2;
panel.add(panelWithText__2, gbc_panelWithText__2);
panelWithText panelWithText__3 = new panelWithText();
GridBagConstraints gbc_panelWithText__3 = new GridBagConstraints();
gbc_panelWithText__3.insets = new Insets(0, 0, 5, 0);
gbc_panelWithText__3.fill = GridBagConstraints.BOTH;
gbc_panelWithText__3.gridx = 0;
gbc_panelWithText__3.gridy = 3;
panel.add(panelWithText__3, gbc_panelWithText__3);
panelWithText panelWithText__4 = new panelWithText();
GridBagConstraints gbc_panelWithText__4 = new GridBagConstraints();
gbc_panelWithText__4.insets = new Insets(0, 0, 5, 0);
gbc_panelWithText__4.fill = GridBagConstraints.BOTH;
gbc_panelWithText__4.gridx = 0;
gbc_panelWithText__4.gridy = 4;
panel.add(panelWithText__4, gbc_panelWithText__4);
panelWithText panelWithText__5 = new panelWithText();
GridBagConstraints gbc_panelWithText__5 = new GridBagConstraints();
gbc_panelWithText__5.insets = new Insets(0, 0, 5, 0);
gbc_panelWithText__5.fill = GridBagConstraints.BOTH;
gbc_panelWithText__5.gridx = 0;
gbc_panelWithText__5.gridy = 5;
panel.add(panelWithText__5, gbc_panelWithText__5);
panelWithText panelWithText__6 = new panelWithText();
GridBagConstraints gbc_panelWithText__6 = new GridBagConstraints();
gbc_panelWithText__6.fill = GridBagConstraints.BOTH;
gbc_panelWithText__6.gridx = 0;
gbc_panelWithText__6.gridy = 6;
panel.add(panelWithText__6, gbc_panelWithText__6);
setSize(300,100);
}
}
panelWithText.java
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Color;
import javax.swing.JTextArea;
import javax.swing.ImageIcon;
import java.awt.BorderLayout;
public class panelWithText extends JPanel {
/**
* Create the panel.
*/
public void me_resized(Dimension d){
System.out.println("CALLED..");
super.setPreferredSize(d);
}
public panelWithText() {
setBackground(Color.DARK_GRAY);
setForeground(Color.WHITE);
setLayout(new BorderLayout(0, 0));
JTextArea txtrIveBeenReading = new JTextArea();
txtrIveBeenReading.setEditable(false);
txtrIveBeenReading.setColumns(28);
txtrIveBeenReading.setFont(new Font("Tahoma", Font.PLAIN, 10));
txtrIveBeenReading.setLineWrap(true);
txtrIveBeenReading.setWrapStyleWord(true);
txtrIveBeenReading.setText("\n A bunch of really important text here... A bunch of really important text here... A bunch of really important text here... A bunch of really important text here...\n");
txtrIveBeenReading.setForeground(Color.WHITE);
txtrIveBeenReading.setBackground(Color.DARK_GRAY);
add(txtrIveBeenReading, BorderLayout.CENTER);
}
}
最佳答案
经过一番游戏后，我想到了这个...
public class Test {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrameExt frame = new JFrameExt();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public static class ScrollablePane extends JPanel implements Scrollable {
@Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(100, 100);
}
@Override
public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {
return 64;
}
@Override
public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
return 128;
}
@Override
public boolean getScrollableTracksViewportWidth() {
return true;
}
@Override
public boolean getScrollableTracksViewportHeight() {
return false;
}
}
public static class JFrameExt extends JFrame {
private JPanel contentPane;
/**
* Create the frame.
*/
public JFrameExt() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 246, 164);
contentPane = new JPanel();
contentPane.setBorder(null);
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportBorder(null);
scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
contentPane.add(scrollPane, BorderLayout.CENTER);
JPanel panel = new ScrollablePane();
scrollPane.setViewportView(panel);
GridBagLayout gbl_panel = new GridBagLayout();
// gbl_panel.columnWidths = new int[]{0, 0};
// gbl_panel.rowHeights = new int[]{0, 0, 0, 0, 0, 0, 0, 0};
// gbl_panel.columnWeights = new double[]{1.0, Double.MIN_VALUE};
// gbl_panel.rowWeights = new double[]{0.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, Double.MIN_VALUE};
panel.setLayout(gbl_panel);
panelWithText panelWithText_ = new panelWithText();
GridBagConstraints gbc_panelWithText_ = new GridBagConstraints();
gbc_panelWithText_.anchor = GridBagConstraints.NORTH;
gbc_panelWithText_.insets = new Insets(0, 0, 5, 0);
gbc_panelWithText_.fill = GridBagConstraints.HORIZONTAL;
gbc_panelWithText_.gridx = 0;
gbc_panelWithText_.gridy = 0;
gbc_panelWithText_.weightx = 1;
panel.add(panelWithText_, gbc_panelWithText_);
// panelWithText panelWithText__1 = new panelWithText();
// GridBagConstraints gbc_panelWithText__1 = new GridBagConstraints();
// gbc_panelWithText__1.insets = new Insets(0, 0, 5, 0);
// gbc_panelWithText__1.anchor = GridBagConstraints.NORTH;
//// gbc_panelWithText__1.fill = GridBagConstraints.HORIZONTAL;
// gbc_panelWithText__1.gridx = 0;
// gbc_panelWithText__1.gridy = 1;
// panel.add(panelWithText__1, gbc_panelWithText__1);
//
// panelWithText panelWithText__2 = new panelWithText();
// GridBagConstraints gbc_panelWithText__2 = new GridBagConstraints();
// gbc_panelWithText__2.insets = new Insets(0, 0, 5, 0);
//// gbc_panelWithText__2.fill = GridBagConstraints.BOTH;
// gbc_panelWithText__2.gridx = 0;
// gbc_panelWithText__2.gridy = 2;
// panel.add(panelWithText__2, gbc_panelWithText__2);
//
// panelWithText panelWithText__3 = new panelWithText();
// GridBagConstraints gbc_panelWithText__3 = new GridBagConstraints();
// gbc_panelWithText__3.insets = new Insets(0, 0, 5, 0);
//// gbc_panelWithText__3.fill = GridBagConstraints.BOTH;
// gbc_panelWithText__3.gridx = 0;
// gbc_panelWithText__3.gridy = 3;
// panel.add(panelWithText__3, gbc_panelWithText__3);
//
// panelWithText panelWithText__4 = new panelWithText();
// GridBagConstraints gbc_panelWithText__4 = new GridBagConstraints();
// gbc_panelWithText__4.insets = new Insets(0, 0, 5, 0);
//// gbc_panelWithText__4.fill = GridBagConstraints.BOTH;
// gbc_panelWithText__4.gridx = 0;
// gbc_panelWithText__4.gridy = 4;
// panel.add(panelWithText__4, gbc_panelWithText__4);
//
// panelWithText panelWithText__5 = new panelWithText();
// GridBagConstraints gbc_panelWithText__5 = new GridBagConstraints();
// gbc_panelWithText__5.insets = new Insets(0, 0, 5, 0);
//// gbc_panelWithText__5.fill = GridBagConstraints.BOTH;
// gbc_panelWithText__5.gridx = 0;
// gbc_panelWithText__5.gridy = 5;
// panel.add(panelWithText__5, gbc_panelWithText__5);
//
// panelWithText panelWithText__6 = new panelWithText();
// GridBagConstraints gbc_panelWithText__6 = new GridBagConstraints();
//// gbc_panelWithText__6.fill = GridBagConstraints.BOTH;
// gbc_panelWithText__6.gridx = 0;
// gbc_panelWithText__6.gridy = 6;
// panel.add(panelWithText__6, gbc_panelWithText__6);
setSize(300, 100);
}
}
public static class panelWithText extends JPanel {
/**
* Create the panel.
*/
public void me_resized(Dimension d) {
System.out.println("CALLED..");
super.setPreferredSize(d);
}
public panelWithText() {
setBackground(Color.DARK_GRAY);
setForeground(Color.WHITE);
setLayout(new BorderLayout(0, 0));
JTextArea txtrIveBeenReading = new JTextArea();
txtrIveBeenReading.setEditable(false);
txtrIveBeenReading.setColumns(28);
txtrIveBeenReading.setFont(new Font("Tahoma", Font.PLAIN, 10));
txtrIveBeenReading.setLineWrap(true);
txtrIveBeenReading.setWrapStyleWord(true);
txtrIveBeenReading.setText("\n A bunch of really important text here... A bunch of really important text here... A bunch of really important text here... A bunch of really important text here...\n");
txtrIveBeenReading.setForeground(Color.WHITE);
txtrIveBeenReading.setBackground(Color.DARK_GRAY);
add(txtrIveBeenReading, BorderLayout.CENTER);
}
}
}
基本上，您需要一个实现
Scrollable接口的容器。这将允许您指定容器应跟踪/匹配视口宽度。每当查看端口更改大小时，这将导致容器被放置...附带说明，可以使用
GridBagConstraints的单个副本，将每个新组件添加到容器时，GridBagLayout会生成其自身的副本。当您要在组件之间共享GridBagConstraints的属性时，此功能非常强大；）