change font of specific lines in JTextArea
hi there ı am working on a chat application and i want that user can change the font which he/she is writing. there is a setFont() function but it changes font of all strings in the TextArea. so i just want to change only my font.i appreciated if you can help me开发者_运维技巧.
well then i guess i must learn a litte HTML
I wouldn't use HTML. I find it easier to just use attributes when dealing with a text pane. Attributes are much easier to change then trying to manipulate HTML.
SimpleAttributeSet green = new SimpleAttributeSet();
StyleConstants.setFontFamily(green, "Courier New Italic");
StyleConstants.setForeground(green, Color.GREEN);
// Add some text
try
{
textPane.getDocument().insertString(0, "green text with Courier font", green);
}
catch(Exception e) {}
You should work with JTextPane. JTextPane allows you to use HTML. Check the following example:
this.text_panel = new JTextPane();
this.text_panel.setContentType("text/html");
this.text_panel.setEditable(false);
this.text_panel.setBackground(this.text_background_color);
this.text_panel_html_kit = new HTMLEditorKit();
this.text_panel.setEditorKit(text_panel_html_kit);
this.text_panel.setDocument(new HTMLDocument());
Here you are enabling HTMLEditorKit, which will allow you to use HTML in your TextPane. Here is another peice of code, where you can add colored text to the panel:
public void append(String line){
SimpleDateFormat date_format = new SimpleDateFormat("HH:mm:ss");
Date date = new Date();
line = "<div><font size=3 color=GRAY>[" + date_format.format(date) + "]</font><font size=3 color=BLACK>"+ line + "</font></div>";
try {
this.text_panel_html_kit.insertHTML((HTMLDocument) this.text_panel.getDocument(), this.text_panel.getDocument().getLength(), line, 0, 0, null);
} catch (Exception e) {
e.printStackTrace();
}
}
Hope this helps,
Serhiy.
You can't do that with JTextArea, but you can do it with its fancier cousin, JTextPane. It's unfortunately not trivial; you can learn about this class here.
A variety of Swing components will render basic HTML (version 3.2), including JLabel & JEditorPane. For further details see How to Use HTML in Swing Components in the Java Tutorial.
Here is a simple example using the latter.
import java.awt.*;
import javax.swing.*;
class ShowFonts {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
GraphicsEnvironment ge = GraphicsEnvironment.
getLocalGraphicsEnvironment();
String[] fonts = ge.getAvailableFontFamilyNames();
String pre = "<html><body style='font-size: 20px;'><ul>";
StringBuilder sb = new StringBuilder(pre);
for (String font : fonts) {
sb.append("<li style='font-family: ");
sb.append(font);
sb.append("'>");
sb.append(font);
}
JEditorPane ep = new JEditorPane();
ep.setContentType("text/html");
ep.setText(sb.toString());
JScrollPane sp = new JScrollPane(ep);
Dimension d = ep.getPreferredSize();
sp.setPreferredSize(new Dimension(d.width,200));
JOptionPane.showMessageDialog(null, sp);
}
});
}
}
加载中,请稍侯......
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