阅读 HTML 时在 JEditorPane 中应用 ForegroundActions 的性能不一致 [英] Inconsistent performance applying ForegroundActions in a JEditorPane when reading HTML
问题描述
我正在使用 JEditorPane，但我在前台操作中遇到了一些不一致的性能问题.下面我有一个简化版的编辑器，它具有三个操作:将字体颜色更改为红色或蓝色，或者更改字体大小.现在使用以下 testFile.html 文件:
I'm building an HTML editor using JEditorPane, but I'm getting some inconsistent performance issues with Foreground Actions. I have a simplified version of my editor below that has three actions: change the font color to red or blue, or change the font-size. Now using the following testFile.html file:
<html>
<head><title>Title</title></head>
<body link="#0000FF" bgcolor="white">
<font size="4" face="arial" color="black">Some test text</font>
<font size="3" face="arial" color="black">Some new test text </font>
</body>
</html>
有时我可以在编辑器中突出显示一些文本，然后按下红色或蓝色按钮，它工作正常，即它会改变颜色.在其他情况下(即如果我关闭我的 JVM 并再次启动它)颜色不会改变，直到我在同一文本上应用 StyledEditorKit.FontSizeAction.
sometimes I can highlight some text in the editor, and press the red or blue color buttons, and it works fine i.e. it changes color. On other occasions (i.e. if I close my JVM and start it up again) the color will not change UNTIL I apply a StyledEditorKit.FontSizeAction on the same text.
我在应用 ForegroundActions 的方式中是否缺少某些东西?或者这可能是一些 Java 错误?
Is there something missing in how I'm applying the ForegroundActions? Or might this be some Java bug?
代码如下:
public class EditorTest extends JFrame{
private JEditorPane editorPane;
public EditorTest()
{
editorPane = new JEditorPane();
editorPane.setContentType("text/HTML");
getContentPane().add(editorPane, BorderLayout.CENTER);
editorPane.setEditorKit(new HTMLEditorKit());
Action a = new StyledEditorKit.ForegroundAction("RedColor", Color.RED);
editorPane.getActionMap().put("RedColor", a);
JToolBar bar = new JToolBar();
JButton button = new JButton("blue");
button.addActionListener(new StyledEditorKit.ForegroundAction (
"set-foreground-red", Color.blue));
bar.add(editorPane.getActionMap().get("font-size-12")).setText("12");
bar.add(button);
bar.add(editorPane.getActionMap().get("RedColor")).setText("Red");
getContentPane().add(bar, BorderLayout.NORTH);
setSize(650,600);
setVisible(true);
File file = new File("testFile.html");
FileReader reader = null;
try
{
reader = new FileReader(file);
editorPane.read(reader, null);
}
catch (IOException ex){}
}
}
推荐答案
使用下面的 sscce，我无法重现你描述的效果.如果不是在 仅构造和操作 Swing GUI 对象，则可能会出现此类异常rel="noreferrer">事件调度线程.该示例相应地使用了 EventQueue.invokeLater().
Using the sscce below, I am unable to reproduce the effect you describe. Such anomalies may arise if Swing GUI objects are not constructed and manipulated only on the event dispatch thread. The example uses EventQueue.invokeLater() accordingly.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JToolBar;
import javax.swing.text.StyledEditorKit;
import javax.swing.text.html.HTMLEditorKit;
/** http://stackoverflow.com/questions/8523445 */
public class StyledEditorTest extends JFrame {
public StyledEditorTest() {
JEditorPane editorPane = new JEditorPane();
editorPane.setContentType("text/HTML");
editorPane.setEditorKit(new HTMLEditorKit());
editorPane.setText("<hr>Welcome to <b>StackOverFlow!</b><hr>");
JToolBar bar = new JToolBar();
bar.add(new StyledEditorKit.ForegroundAction("Red", Color.red));
bar.add(new StyledEditorKit.ForegroundAction("Blue", Color.blue));
bar.add(new StyledEditorKit.FontSizeAction("12", 12));
bar.add(new StyledEditorKit.FontSizeAction("14", 14));
bar.add(new StyledEditorKit.FontSizeAction("16", 16));
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
this.add(bar, BorderLayout.NORTH);
this.add(editorPane, BorderLayout.CENTER);
this.pack();
this.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new StyledEditorTest();
}
});
}
}
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