Java在JTextPane上设置缩进大小 [英] Java Setting Indent Size on JTextPane
问题描述
我想将JTextPane
中制表符\ t的大小设置为4个空格.
I want to set the size of a tab character, \t, in a JTextPane
to be 4 spaces wide.
在谷歌搜索了很多之后,我发现了一些我要尝试的东西以及它们为什么失败的东西.
After Googling quite a bit I found some things that I will include here for what I have tried and maybe why they failed.
JTextPane
不是普通文档.
Eclipse引发了一些错误:
Eclipse raised some errors:
Type mismatch: cannot convert from javax.swing.text.AttributeSet to
javax.print.attribute.AttributeSet
和
The method setParagraphAttributes(javax.swing.text.AttributeSet, boolean) in the type JTextPane is not applicable for the
arguments (javax.print.attribute.AttributeSet, boolean)
http://www.java2s.com/Code/Java /Swing-JFC/TextPaneSample.htm
此页面讨论使用JTextPane
进行样式设置.我改编而成的代码如下:
This page talks about styling with JTextPane
. The code I adapted from it and made this:
MutableAttributeSet set = new SimpleAttributeSet(pane.getParagraphAttributes());
StyleConstants.setLeftIndent(set, 40);
StyleConstants.setRightIndent(set, 40);
推荐答案
我想将JTextPane中制表符\ t的大小设置为4个空格.
I want to set the size of a tab character, \t, in a JTextPane to be 4 spaces wide.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.event.*;
public class TextPaneTabs
{
public static void setTabs( final JTextPane textPane, int charactersPerTab)
{
FontMetrics fm = textPane.getFontMetrics( textPane.getFont() );
// int charWidth = fm.charWidth( 'w' );
int charWidth = fm.charWidth( ' ' );
int tabWidth = charWidth * charactersPerTab;
// int tabWidth = 100;
TabStop[] tabs = new TabStop[5];
for (int j = 0; j < tabs.length; j++)
{
int tab = j + 1;
tabs[j] = new TabStop( tab * tabWidth );
}
TabSet tabSet = new TabSet(tabs);
SimpleAttributeSet attributes = new SimpleAttributeSet();
StyleConstants.setTabSet(attributes, tabSet);
int length = textPane.getDocument().getLength();
textPane.getStyledDocument().setParagraphAttributes(0, length, attributes, false);
}
private static void createAndShowUI()
{
JTextPane textPane = new JTextPane();
textPane.setText("12345678\n\t1\t2\t3aaaaa\t4\t5\t6\t7\t8\n\t1\t2\t3\t4\t5\t6\t7\t8\n\t\t12345678");
JScrollPane scrollPane = new JScrollPane( textPane );
scrollPane.setPreferredSize( new Dimension(700, 100 ) );
// Change the tab size to 4 characters
setTabs( textPane, 4 );
JFrame frame = new JFrame("SSCCE");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( scrollPane );
frame.setLocationByPlatform( true );
frame.pack();
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}
当然,当使用JTextPane的默认Font时,空格的宽度不是很宽,因此实际选项卡不会那么大.
Of course when using the default Font of a JTextPane the width of a space is not very wide so the actual tab will not be that big.
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