右对齐光标在JTextPane组件中不显示 [英] Right aligned cursor not showing through in a JTextPane component
本文介绍了右对齐光标在JTextPane组件中不显示的处理方法，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
我有一个JTextPane夹在2 JLabels之间 - 有一个已知的原因，为什么光标显示通过，如果我有它的左边大部分的文本框，但不是在右边？
以下是更好地演示我的意思的代码：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
public class Testing {
/ **
* @param args
* /
public static void main（String [] args）{
JFrame f = new JFrame（Test）;
f.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
JPanel cp = new JPanel（new BorderLayout（））;
f.setContentPane（cp）;
final SubPanel subPanel = new SubPanel（）;
cp.add（subPanel，BorderLayout.CENTER）;
JPanel buttonPanel = new JPanel（new FlowLayout（））;
buttonPanel.add（new JLabel（Align））;
final JComboBox alignCB = new JComboBox（new String [] {left，center，right}）;
alignCB.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e）{
subPanel.align（（String）alignCB.getSelectedItem（））;
}
}）;
buttonPanel.add（alignCB）;
buttonPanel.add（new JLabel（Justify））;
final JComboBox justifyCB = new JComboBox（new String [] {left，center，right}）;
justifyCB.addActionListener（new ActionListener（）{
@Override
public void actionPerformed（ActionEvent e）{
subPanel.justify（（String）justifyCB.getSelectedItem（））;
}
}）;
buttonPanel.add（justifyCB）;
JTextField tf = new JTextField（TF）;
tf.setBorder（null）;
buttonPanel.add（tf）;
cp.add（buttonPanel，BorderLayout.NORTH）;
f.pack（）;
f.setSize（new Dimension（300,300））;
f.setLocation（300，300）;
f.setVisible（true）;
}
public static class SubPanel extends JPanel {
JPanel innerPanel = new JPanel（new GridBagLayout（））;
TextPaneWidget [] tps = new TextPaneWidget [3];
public SubPanel（）{
// setBorder（BorderFactory.createLineBorder（Color.RED））;
setBorder（null）;
// innerPanel.setBorder（BorderFactory.createLineBorder（Color.BLUE））;
innerPanel.setBorder（null）;
for（int i = 0; i
}
int gridy = 0;
for（TextPaneWidget tp：tps）{
innerPanel.add（tp，new GridBagConstraints（0，gridy，1,1，0.0，0.0，GridBagConstraints.NORTHEAST，GridBagConstraints.HORIZONTAL，new Insets 0,0,0），0,0））;
gridy ++;
}
setLayout（new GridBagLayout（））;
add（innerPanel，new GridBagConstraints（0,0，1,1，1.0，0.0，GridBagConstraints.WEST，GridBagConstraints.NONE，new Insets（0,0,0,0），0，0 ））;
}
public void align（String alignment）{
System.out.println（Align：+ alignment）;
int anchor = GridBagConstraints.CENTER;
if（right.equals（alignment））{
anchor = GridBagConstraints.EAST;
} else if（left.equals（alignment））{
anchor = GridBagConstraints.WEST;
}
GridBagLayout gbl =（GridBagLayout）getLayout（）;
gbl.setConstraints（innerPanel，new GridBagConstraints（0,0，1,1，1.0，0.0，anchor，GridBagConstraints.NONE，new Insets（0,0,0,0），0，0））;
revalidate（）;
repaint（）;
}
public void justify（String justification）{
System.out.println（Justify：+ justification）;
for（TextPaneWidget tp：tps）{
tp.justify（justification）;
}
}
}
public static class MyDocument extends DefaultStyledDocument {
@Override
public void insertString（int offset，String text， AttributeSet attributeSet）throws BadLocationException {
SimpleAttributeSet attrs = new SimpleAttributeSet（attributeSet）;
StyleConstants.setForeground（attrs，Color.WHITE）;
StyleConstants.setBackground（attrs，Color.RED）;
super.insertString（offset，text，attrs）;
}
}
public static class TextPaneWidget extends JPanel {
JTextPane tp = new JTextPane（）;
JLabel lSpace = new JLabel（）;
JLabel rSpace = new JLabel（）;
public TextPaneWidget（）{
// setBorder（BorderFactory.createLineBorder（Color.GREEN））;
setBorder（null）;
字体font = new Font（monospaced，Font.BOLD，13）;
tp.setBorder（null）;
tp.setDocument（new MyDocument（））;
tp.setFont（font）;
tp.setText（Text）;
tp.setOpaque（true）;
setLayout（new GridBagLayout（））;
lSpace.setBackground（Color.MAGENTA）;
lSpace.setOpaque（true）;
lSpace.setBorder（null）;
add（lSpace，new GridBagConstraints（0,0，1,1，0.0，0.0，GridBagConstraints.EAST，GridBagConstraints.VERTICAL，new Insets（0,0,0,0），0，0））;
add（tp，new GridBagConstraints（1,0，1,1，0.0，0.0，GridBagConstraints.CENTER，GridBagConstraints.NONE，new Insets（0,0,0,0），0，0 ））;
rSpace.setBackground（Color.MAGENTA）;
rSpace.setOpaque（true）;
rSpace.setBorder（null）;
add（rSpace，new GridBagConstraints（2,0，1,1，1.0，0.0，GridBagConstraints.WEST，GridBagConstraints.VERTICAL，new Insets（0,0,0,0），0，0））;
addMouseListener（new MouseAdapter（）{
@Override
public void mouseClicked（MouseEvent e）{
tp.setCaretPosition（（e.getX（）< tp .getX（））？0：tp.getText（）。length（））;
tp.requestFocusInWindow（）;
}
}）;
lSpace.addMouseListener（new MouseAdapter（）{
@Override
public void mouseClicked（MouseEvent e）{
tp.setCaretPosition（0）;
tp.requestFocusInWindow（）;
}
}）;
rSpace.addMouseListener（new MouseAdapter（）{
@Override
public void mouseClicked（MouseEvent e）{
tp.getText（）。length （））;
tp.requestFocusInWindow（）;
}
}）;
}
public void justify（String justification）{
double leftWeight = 0.5;
double rightWeight = 0.5;
if（right.equals（justification））{
leftWeight = 1.0;
rightWeight = 0.0;
} else if（left.equals（justification））{
leftWeight = 0.0;
rightWeight = 1.0;
}
GridBagLayout gbl =（GridBagLayout）getLayout（）;
gbl.setConstraints（lSpace，new GridBagConstraints（0,0，1,1，leftWeight，0.0，GridBagConstraints.EAST，GridBagConstraints.VERTICAL，new Insets（0,0,0,0），0，0）） ;
gbl.setConstraints（rSpace，new GridBagConstraints（2,0，1,1，rightWeight，0.0，GridBagConstraints.WEST，GridBagConstraints.VERTICAL，new Insets（0,0,0,0），0，0）） ;
revalidate（）;
repaint（）;
}
}
}
解决方案>
将背景设置为以下修正此...
tp.setBackground（Color.RED）;
tp.setOpaque（true）;
I have a JTextPane sandwiched between 2 JLabels - is there a known reason why the cursor shows through if i have it on the left most part of the textpane but not on the right?
Here is the code to better demonstrate what i mean:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
public class Testing {
/**
* @param args
*/
public static void main(String[] args) {
JFrame f = new JFrame("Test");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel cp = new JPanel(new BorderLayout());
f.setContentPane(cp);
final SubPanel subPanel = new SubPanel();
cp.add(subPanel, BorderLayout.CENTER);
JPanel buttonPanel = new JPanel(new FlowLayout());
buttonPanel.add(new JLabel("Align"));
final JComboBox alignCB = new JComboBox(new String[] {"left", "centre", "right"});
alignCB.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
subPanel.align((String) alignCB.getSelectedItem());
}
});
buttonPanel.add(alignCB);
buttonPanel.add(new JLabel("Justify"));
final JComboBox justifyCB = new JComboBox(new String[] {"left", "centre", "right"});
justifyCB.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
subPanel.justify((String) justifyCB.getSelectedItem());
}
});
buttonPanel.add(justifyCB);
JTextField tf = new JTextField("TF");
tf.setBorder(null);
buttonPanel.add(tf);
cp.add(buttonPanel, BorderLayout.NORTH);
f.pack();
f.setSize(new Dimension(300,300));
f.setLocation(300, 300);
f.setVisible(true);
}
public static class SubPanel extends JPanel {
JPanel innerPanel = new JPanel(new GridBagLayout());
TextPaneWidget[] tps = new TextPaneWidget[3];
public SubPanel() {
// setBorder(BorderFactory.createLineBorder(Color.RED));
setBorder(null);
// innerPanel.setBorder(BorderFactory.createLineBorder(Color.BLUE));
innerPanel.setBorder(null);
for (int i = 0; i < tps.length; i++) {
tps[i] = new TextPaneWidget();
}
int gridy = 0;
for (TextPaneWidget tp : tps) {
innerPanel.add(tp, new GridBagConstraints(0,gridy, 1,1, 0.0, 0.0, GridBagConstraints.NORTHEAST, GridBagConstraints.HORIZONTAL, new Insets(0,0,0,0), 0, 0));
gridy++;
}
setLayout(new GridBagLayout());
add(innerPanel, new GridBagConstraints(0,0, 1,1, 1.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0,0,0,0), 0, 0));
}
public void align(String alignment) {
System.out.println("Align: " + alignment);
int anchor = GridBagConstraints.CENTER;
if ("right".equals(alignment)) {
anchor = GridBagConstraints.EAST;
} else if ("left".equals(alignment)) {
anchor = GridBagConstraints.WEST;
}
GridBagLayout gbl = (GridBagLayout) getLayout();
gbl.setConstraints(innerPanel, new GridBagConstraints(0,0, 1,1, 1.0, 0.0, anchor, GridBagConstraints.NONE, new Insets(0,0,0,0), 0, 0));
revalidate();
repaint();
}
public void justify(String justification) {
System.out.println("Justify: " + justification);
for (TextPaneWidget tp : tps) {
tp.justify(justification);
}
}
}
public static class MyDocument extends DefaultStyledDocument {
@Override
public void insertString(int offset, String text, AttributeSet attributeSet) throws BadLocationException {
SimpleAttributeSet attrs = new SimpleAttributeSet(attributeSet);
StyleConstants.setForeground(attrs, Color.WHITE);
StyleConstants.setBackground(attrs, Color.RED);
super.insertString(offset, text, attrs);
}
}
public static class TextPaneWidget extends JPanel {
JTextPane tp = new JTextPane();
JLabel lSpace = new JLabel(" ");
JLabel rSpace = new JLabel(" ");
public TextPaneWidget() {
// setBorder(BorderFactory.createLineBorder(Color.GREEN));
setBorder(null);
Font font = new Font("monospaced", Font.BOLD, 13);
tp.setBorder(null);
tp.setDocument(new MyDocument());
tp.setFont(font);
tp.setText("Text");
tp.setOpaque(true);
setLayout(new GridBagLayout());
lSpace.setBackground(Color.MAGENTA);
lSpace.setOpaque(true);
lSpace.setBorder(null);
add(lSpace, new GridBagConstraints(0,0, 1,1, 0.0, 0.0, GridBagConstraints.EAST, GridBagConstraints.VERTICAL, new Insets(0,0,0,0), 0, 0));
add(tp, new GridBagConstraints(1,0, 1,1, 0.0, 0.0, GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0,0,0,0), 0, 0));
rSpace.setBackground(Color.MAGENTA);
rSpace.setOpaque(true);
rSpace.setBorder(null);
add(rSpace, new GridBagConstraints(2,0, 1,1, 1.0, 0.0, GridBagConstraints.WEST, GridBagConstraints.VERTICAL, new Insets(0,0,0,0), 0, 0));
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
tp.setCaretPosition((e.getX() < tp.getX()) ? 0 : tp.getText().length());
tp.requestFocusInWindow();
}
});
lSpace.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
tp.setCaretPosition(0);
tp.requestFocusInWindow();
}
});
rSpace.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
tp.setCaretPosition(tp.getText().length());
tp.requestFocusInWindow();
}
});
}
public void justify(String justification) {
double leftWeight = 0.5;
double rightWeight = 0.5;
if ("right".equals(justification)) {
leftWeight = 1.0;
rightWeight = 0.0;
} else if ("left".equals(justification)) {
leftWeight = 0.0;
rightWeight = 1.0;
}
GridBagLayout gbl = (GridBagLayout) getLayout();
gbl.setConstraints(lSpace, new GridBagConstraints(0,0, 1,1, leftWeight, 0.0, GridBagConstraints.EAST, GridBagConstraints.VERTICAL, new Insets(0,0,0,0), 0, 0));
gbl.setConstraints(rSpace, new GridBagConstraints(2,0, 1,1, rightWeight, 0.0, GridBagConstraints.WEST, GridBagConstraints.VERTICAL, new Insets(0,0,0,0), 0, 0));
revalidate();
repaint();
}
}
}
解决方案
Setting the background to the following fixes this...
tp.setBackground(Color.RED);
tp.setOpaque(true);
这篇关于右对齐光标在JTextPane组件中不显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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