Hi,
I've got a JList with a custom renderer. I want this renderer to display 2 lines of text. If the text is more then what these 2 lines can display, then I want to break off the text and show "..." at the end. I'm doing this as follows now (see below).
But I want to ask if there can be some improvement in this code, because I think it is higly unoptimised. Especially that while condition is bugging me. Does anybody have a better idea? Also I wonder why I need to subtract 50 from twice the width, otherwise the string I got is still too long?
regards,
Wim
private static class MyListCellRenderer extends DefaultListCellRenderer
{
public Component getListCellRendererComponent(
JList list,
Object value,
int index,
boolean isSelected,
boolean cellHasFocus )
{
JLabel label = (JLabel)super.getListCellRendererComponent( list, value, index, isSelected, cellHasFocus );
String text = label.getText();
JTextArea textArea = new JTextArea(text);
textArea.setEditable(false);
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
textArea.setBackground(label.getBackground());
textArea.setForeground(label.getForeground());
// Set size twice a normal label to have 2 lines of text
Dimension size = new Dimension(400, label.getPreferredSize().height * 2);
textArea.setPreferredSize(size);
textArea.setMinimumSize(size);
textArea.setMaximumSize(size);
FontMetrics fontMetrics = getFontMetrics(textArea.getFont());
int width = fontMetrics.stringWidth(text);
if( width > 2 * size.width)
{
// The text width is more then the JTextArea can display in 2 lines
int i = 5;
String choppedText = text.substring(0, i);
// Search the string that just can be displayed
while( fontMetrics.stringWidth(choppedText) < (2 * size.width) - 50)
{
choppedText = text.substring(0, i);
i++;
}
String newText = choppedText + "...";
textArea.setText(newText );
}
textArea.setBorder( label.getBorder() );
return textArea;
}
}
-------------
Ing. Wim Deblauwe
Software Development Engineer
Medical Imaging Systems - BarcoView
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