我不明白 JTextPane 中的包装行为。如果我插入一个短文本,然后是一个 JComponent,然后再插入一个短文本,如果框架足够大,我可以在一行中看到插入的内容。但是,如果文本更长以至于需要多行,则组件总是被放置在新行中。
我已经认识到,在将组件插入 JTextPane 后,它的文本会变长一个字符。因此,如果一个组件被 JTextPane 视为一个字符,为什么它的行为不像一个字符?可能取决于java版本吗?我使用Java(TM) SE 运行时环境(构建 1.7.0-b147)
下面是我的代码(用 shortText/longText 实例化变量 currentText 以重现上述行为):
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
public class Test {
public static void main(String[] args) {
JFrame frame = new JFrame();
JTextPane textPane = new JTextPane();
textPane.setContentType("text/html");
String shortText = "one two three four five six seven";
String longText = "A text component that can be marked up with attributes that are represented graphically. You can find how-to information and examples of using text panes in Using Text Components, a section in The Java Tutorial. This component models paragraphs that are composed of runs of character level attributes. Each paragraph may have a logical style attached to it which contains the default attributes to use if not overridden by attributes set on the paragraph or character run. Components and images may be embedded in the flow of text.";
String currentText = shortText;
try {
// insert text before the component
textPane.getDocument().insertString(textPane.getDocument().getLength(), currentText,
new SimpleAttributeSet());
textPane.setSelectionStart(textPane.getDocument().getLength());
textPane.setSelectionEnd(textPane.getDocument().getLength());
JComboBox component = new JComboBox();
component.setMaximumSize(component.getPreferredSize());
textPane.insertComponent(component);
// insert text after the component
textPane.getDocument().insertString(textPane.getDocument().getLength(), currentText,
new SimpleAttributeSet());
} catch (BadLocationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
textPane.setEditable(false);
frame.add(new JScrollPane(textPane));
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}