Java选定文本超过突出显示的文本
我有一个文本JTextArea,其中有一些突出显示的文本,使用:Java选定文本超过突出显示的文本,java,swing,Java,Swing,我有一个文本JTextArea,其中有一些突出显示的文本,使用: inputTextArea.getHighlighter().addHighlight(start, end, new DefaultHighlighter.DefaultHighlightPainter(new Color(color))); 它工作得很好,但是如果我使用鼠标选择一些文本,当它位于高亮显示的文本上时,选择不会被绘制 例如,如果我只想选择高亮显示文本的一部分,我就看不到选择 如何使选择显示在高光上?您只需要一个允
inputTextArea.getHighlighter().addHighlight(start, end, new DefaultHighlighter.DefaultHighlightPainter(new Color(color)));
它工作得很好,但是如果我使用鼠标选择一些文本,当它位于高亮显示的文本上时,选择不会被绘制
例如,如果我只想选择高亮显示文本的一部分,我就看不到选择
如何使选择显示在高光上?您只需要一个允许修改绘制坐标的代理荧光灯。以下是一个例子:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Shape;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
import javax.swing.text.DefaultHighlighter;
import javax.swing.text.Highlighter.HighlightPainter;
import javax.swing.text.JTextComponent;
public class HighlightTest {
public static void main(String[] args) {
JTextArea textArea = new JTextArea(10, 30);
textArea.setText("It's a small test to understand whether proxy works or not.");
try {
textArea.getHighlighter().addHighlight(5, 15,
new ProxyHighlightPainer(new DefaultHighlighter.DefaultHighlightPainter(Color.RED)));
} catch (Exception e) {
// add something when required
}
textArea.addCaretListener(e -> textArea.repaint()); // must provoke repaint of highlighter
JFrame frm = new JFrame("Test");
frm.add(new JScrollPane(textArea));
frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frm.pack();
frm.setLocationRelativeTo(null);
frm.setVisible(true);
}
private static class ProxyHighlightPainer implements HighlightPainter {
private final HighlightPainter delegate;
public ProxyHighlightPainer(HighlightPainter delegate) {
this.delegate = delegate;
}
@Override
public void paint(Graphics g, int p0, int p1, Shape bounds, JTextComponent c) {
int startSel = c.getSelectionStart();
int endSel = c.getSelectionEnd();
if (startSel == endSel || startSel >= p1 || endSel <= p0) {
// no selection or no intersection: paint normal
delegate.paint(g, p0, p1, bounds, c);
} else if (startSel >= p0 && endSel >= p1) {
delegate.paint(g, p0, startSel, bounds, c);
} else if (startSel <= p0 && endSel <= p1) {
delegate.paint(g, endSel, p1, bounds, c);
} else if (startSel <= p0 && endSel <= p1) {
delegate.paint(g, p0, startSel, bounds, c);
delegate.paint(g, endSel, p1, bounds, c);
} else {
// just to be safe
delegate.paint(g, p0, p1, bounds, c);
}
}
}
}
您只需要一个允许修改绘制坐标的代理荧光灯。以下是一个例子:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Shape;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;
import javax.swing.text.DefaultHighlighter;
import javax.swing.text.Highlighter.HighlightPainter;
import javax.swing.text.JTextComponent;
public class HighlightTest {
public static void main(String[] args) {
JTextArea textArea = new JTextArea(10, 30);
textArea.setText("It's a small test to understand whether proxy works or not.");
try {
textArea.getHighlighter().addHighlight(5, 15,
new ProxyHighlightPainer(new DefaultHighlighter.DefaultHighlightPainter(Color.RED)));
} catch (Exception e) {
// add something when required
}
textArea.addCaretListener(e -> textArea.repaint()); // must provoke repaint of highlighter
JFrame frm = new JFrame("Test");
frm.add(new JScrollPane(textArea));
frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frm.pack();
frm.setLocationRelativeTo(null);
frm.setVisible(true);
}
private static class ProxyHighlightPainer implements HighlightPainter {
private final HighlightPainter delegate;
public ProxyHighlightPainer(HighlightPainter delegate) {
this.delegate = delegate;
}
@Override
public void paint(Graphics g, int p0, int p1, Shape bounds, JTextComponent c) {
int startSel = c.getSelectionStart();
int endSel = c.getSelectionEnd();
if (startSel == endSel || startSel >= p1 || endSel <= p0) {
// no selection or no intersection: paint normal
delegate.paint(g, p0, p1, bounds, c);
} else if (startSel >= p0 && endSel >= p1) {
delegate.paint(g, p0, startSel, bounds, c);
} else if (startSel <= p0 && endSel <= p1) {
delegate.paint(g, endSel, p1, bounds, c);
} else if (startSel <= p0 && endSel <= p1) {
delegate.paint(g, p0, startSel, bounds, c);
delegate.paint(g, endSel, p1, bounds, c);
} else {
// just to be safe
delegate.paint(g, p0, p1, bounds, c);
}
}
}
}
您可能可以使用:
JTextArea textArea = new JTextArea(10, 20);
textArea.setText( "one\ntwo\nthree\nfour\nfive\nsix\nseven\neight" );
DefaultHighlighter highlighter = (DefaultHighlighter)textArea.getHighlighter();
highlighter.setDrawsLayeredHighlights(false);
try
{
highlighter.addHighlight(10, 20, new DefaultHighlighter.DefaultHighlightPainter(Color.YELLOW));
}
catch(Exception e) {}
更改“分层高光”特性有两种效果:
现在您将看到选择
高亮显示是在一行的文本区域的末尾进行的,而不是在高亮显示的文本跨越多行时仅在文本的末尾进行。
您可能可以使用:
JTextArea textArea = new JTextArea(10, 20);
textArea.setText( "one\ntwo\nthree\nfour\nfive\nsix\nseven\neight" );
DefaultHighlighter highlighter = (DefaultHighlighter)textArea.getHighlighter();
highlighter.setDrawsLayeredHighlights(false);
try
{
highlighter.addHighlight(10, 20, new DefaultHighlighter.DefaultHighlightPainter(Color.YELLOW));
}
catch(Exception e) {}
更改“分层高光”特性有两种效果:
现在您将看到选择
高亮显示是在一行的文本区域的末尾进行的,而不是在高亮显示的文本跨越多行时仅在文本的末尾进行。
也许你需要使用caretListener来更新突出显示的文本-也许你需要使用caretListener来更新突出显示的文本-1+很好的解决方案。我一直不明白为什么这不是默认行为。1+很好的解决方案。我一直不明白为什么这不是默认行为。