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POCan't remove extra line spacing in JTextPane for html content
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  1. POCan't remove extra line spacing in JTextPane for html content
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    copied!<p>I can't squeeze together the lines in a Java <code>JTextPane</code> if I set the content-type to <code>text/html</code>. I would like them as close together as they are when the content-type is <code>text/plain</code>, the default.</p> <p>The <code>line-height</code>, <code>top-margin</code>, ... CSS properties don't seem to help :(.</p> <p>This is the output of my sample program, that shows that the lines do take more space when a HTML editor handles the rendering:</p> <p><a href="http://lh6.ggpht.com/_Wx4sMDdKKdU/S8cYWIPKhzI/AAAAAAAAAig/4QzFwygmEBs/simpleTextPane.PNG" rel="nofollow noreferrer">alt text http://lh6.ggpht.com/_Wx4sMDdKKdU/S8cYWIPKhzI/AAAAAAAAAig/4QzFwygmEBs/simpleTextPane.PNG</a></p> <p>The code that generates the frame is:</p> <pre><code>import java.awt.BorderLayout; import java.awt.Dimension; import javax.swing.JFrame; import javax.swing.JTextPane; import javax.swing.text.StyleConstants; import javax.swing.text.html.HTMLEditorKit; import javax.swing.text.html.StyleSheet; public class DemoSimplestGui extends JFrame { private static final long serialVersionUID = 1L; private static final int WINDOW_WIDTH = 800; private static final int WINDOW_HEIGHT = 130; private static final String PLAIN_TEXT = "" + "This is some &lt;b&gt;plain text&lt;/b&gt;\n" + "separated by backslash-n characters\n" + "There's no empty space between lines\n" + "which is exactly what we need."; private static final String DIV_BASED_HTML_TEXT = "" + "&lt;div&gt;This is some &lt;b&gt;html text&lt;/b&gt;&lt;/div&gt;" + "&lt;div&gt;that usses DIV tags.&lt;/div&gt;" + "&lt;div&gt;There's too much blank space&lt;/div&gt;" + "&lt;div&gt;and that sucks for my application&lt;/div&gt;"; private static final String PRE_BASED_HTML_TEXT = "" + "&lt;pre&gt;This is some &lt;b&gt;html text&lt;/b&gt;&lt;/pre&gt;" + "&lt;pre&gt;that usses PRE tags&lt;/pre&gt;" + "&lt;pre&gt;There's too much blank space grr&lt;/pre&gt;" + "&lt;pre&gt;and that sucks for my application&lt;/pre&gt;"; public static void main(String[] args) { final DemoSimplestGui frame = new DemoSimplestGui(); frame.setPreferredSize(new Dimension(WINDOW_WIDTH, WINDOW_HEIGHT)); frame.setSize(frame.getPreferredSize()); frame.setMinimumSize(new Dimension(WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2)); frame.init(); frame.setVisible(true); } public void init() { setLayout(new BorderLayout(10, 10)); add(createPlainTextPane(), BorderLayout.WEST); add(createDivBasedHtmlTextPane(), BorderLayout.CENTER); add(createPreBasedHtmlTextPane(), BorderLayout.EAST); } private JTextPane createPlainTextPane() { final JTextPane textPane = new JTextPane(); textPane.setContentType("text/plain"); StyleConstants.setFontFamily(textPane.getInputAttributes(), "Courier New"); textPane.setText(PLAIN_TEXT); return textPane; } private JTextPane createDivBasedHtmlTextPane() { final JTextPane textPane = new JTextPane(); textPane.setContentType("text/html"); textPane.setEditorKit(configureHtmlEditorKit(textPane)); textPane.setText(DIV_BASED_HTML_TEXT); return textPane; } private JTextPane createPreBasedHtmlTextPane() { final JTextPane textPane = new JTextPane(); textPane.setContentType("text/html"); textPane.setEditorKit(configureHtmlEditorKit(textPane)); textPane.setText(PRE_BASED_HTML_TEXT); return textPane; } private HTMLEditorKit configureHtmlEditorKit(JTextPane textPane) { final HTMLEditorKit kit = (HTMLEditorKit) textPane.getEditorKit(); final StyleSheet css = new StyleSheet(); css.addRule("body { font-family: monospaced; margin-top: 0; margin-down: 0; line-height: 0; }"); css.addRule("div, pre { margin-top: 0; margin-down: 0; line-height: 0; }"); kit.setStyleSheet(css); return kit; } } </code></pre> <p>I'd really appreciate some hint :D</p>
 

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