使用Swing设置选定的文本颜色
我想显示一个用户选择颜色的选定文本。我的问题是我选择了一些文本并点击settextcolor它应用于所有文本未选择的文本。请给我..这是我的代码：
public class SetTextColor extends javax.swing.JFrame { int i=0; JTextPane textPane; JScrollPane scrollPane; public SetTextColor() { initComponents(); } @SuppressWarnings("unchecked") // private void initComponents() { tabbedPane = new javax.swing.JTabbedPane(); jMenuBar1 = new javax.swing.JMenuBar(); jMenu1 = new javax.swing.JMenu(); Create = new javax.swing.JMenuItem(); SetTextColor = new javax.swing.JMenuItem(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jMenu1.setText("File"); Create.setText("Create"); Create.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { CreateActionPerformed(evt); } }); jMenu1.add(Create); SetTextColor.setText("SetTextColor"); SetTextColor.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { SetTextColorActionPerformed(evt); } }); jMenu1.add(SetTextColor); jMenuBar1.add(jMenu1); setJMenuBar(jMenuBar1); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(tabbedPane, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(tabbedPane, javax.swing.GroupLayout.DEFAULT_SIZE, 298, Short.MAX_VALUE) ); pack(); }// private void CreateActionPerformed(java.awt.event.ActionEvent evt) { final JInternalFrame internalFrame = new JInternalFrame(""); i++; internalFrame.setName("Document"+i); internalFrame.setClosable(true); internalFrame.setAutoscrolls(true); textPane=new JTextPane(); textPane.setFont(new java.awt.Font("Miriam Fixed", 0, 13)); scrollPane=new JScrollPane(textPane); internalFrame.add(scrollPane); tabbedPane.add(internalFrame); internalFrame.setSize(internalFrame.getMaximumSize()); internalFrame.pack(); internalFrame.setVisible(true); } private void SetTextColorActionPerformed(java.awt.event.ActionEvent evt) { Color color = JColorChooser.showDialog(this, "Colors",Color.BLUE); StyledDocument doc = textPane.getStyledDocument(); String text=textPane.getSelectedText(); Style style = textPane.addStyle("I'm a Style", null); StyleConstants.setForeground(style, color); textPane.setForeground(color); } public static void main(String args[]) { /* Set the Nimbus look and feel */ // /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(SetTextColor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(SetTextColor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(SetTextColor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(SetTextColor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } // /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { new SetTextColor().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JMenuItem Create; private javax.swing.JMenuItem SetTextColor; private javax.swing.JMenu jMenu1; private javax.swing.JMenuBar jMenuBar1; private javax.swing.JTabbedPane tabbedPane; // End of variables declaration }
这可能是Caret的默认行为，它会在文本组件失去焦点时隐藏选择。
您可以通过创建自定义Caret并覆盖isSelectionVisible方法以始终返回true来更改此设置
例如…
DefaultCaret caret = new DefaultCaret() { @Override public boolean isSelectionVisible() { return true; } };
……可运行的例子……
import java.awt.Color; import javax.swing.JColorChooser; import javax.swing.JInternalFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.text.DefaultCaret; public class SetTextColor extends javax.swing.JFrame { int i = 0; JTextArea textArea; JScrollPane scrollPane; public SetTextColor() { initComponents(); } @SuppressWarnings("unchecked") // private void initComponents() { tabbedPane = new javax.swing.JTabbedPane(); jMenuBar1 = new javax.swing.JMenuBar(); jMenu1 = new javax.swing.JMenu(); Create = new javax.swing.JMenuItem(); SetTextColor = new javax.swing.JMenuItem(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jMenu1.setText("File"); Create.setText("Create"); Create.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { CreateActionPerformed(evt); } }); jMenu1.add(Create); SetTextColor.setText("SetTextColor"); SetTextColor.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { SetTextColorActionPerformed(evt); } }); jMenu1.add(SetTextColor); jMenuBar1.add(jMenu1); setJMenuBar(jMenuBar1); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(tabbedPane, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(tabbedPane, javax.swing.GroupLayout.DEFAULT_SIZE, 298, Short.MAX_VALUE) ); pack(); }// private void CreateActionPerformed(java.awt.event.ActionEvent evt) { final JInternalFrame internalFrame = new JInternalFrame(""); i++; internalFrame.setName("Document" + i); internalFrame.setClosable(true); internalFrame.setAutoscrolls(true); textArea = new JTextArea(); DefaultCaret caret = new DefaultCaret() { @Override public boolean isSelectionVisible() { return true; } }; textArea.setCaret(caret); textArea.setFont(new java.awt.Font("Miriam Fixed", 0, 13)); scrollPane = new JScrollPane(textArea); internalFrame.add(scrollPane); tabbedPane.add(internalFrame); internalFrame.setSize(internalFrame.getMaximumSize()); internalFrame.pack(); internalFrame.setVisible(true); } private void SetTextColorActionPerformed(java.awt.event.ActionEvent evt) { Color color = JColorChooser.showDialog(this, "Colors", Color.BLUE); // textArea.setBackground(color); textArea.setSelectedTextColor(color); } public static void main(String args[]) { /* Set the Nimbus look and feel */ // /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(SetTextColor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(SetTextColor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(SetTextColor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(SetTextColor.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } // /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { new SetTextColor().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JMenuItem Create; private javax.swing.JMenuItem SetTextColor; private javax.swing.JMenu jMenu1; private javax.swing.JMenuBar jMenuBar1; private javax.swing.JTabbedPane tabbedPane; // End of variables declaration }