How to horizontal align multi-line Text in a JTable-Cell

[Hotkey]

Hi everyone,

i'm currently trying to accomplish a multi-line column with different horizontal alignment within a JTable. I managed to implement the multi-line with a JTextArea as the CellRenderer but unfortunately the JTextArea doesn't have a (working) setHorizontalAlignment method (setAlignmentX(..) doesn't work either).
Here's a Screenshot and below the current code (The Text in Columns 4 and 5 contain \n for the line break):


Code of my TableCellRenderer:

    public Component getTableCellRendererComponent(
                    JTable table,
                    Object value,
                    boolean isSelected,
                    boolean hasFocus,
                    int row,
                    int column) {
	        this.setText(value.toString());
	        this.setWrapStyleWord(true);                    
	        this.setLineWrap(true);   
	        System.out.println(value.toString());
	        // current table column width in pixels
	        int colWidth = table.getColumnModel().getColumn(column).getWidth();
	        // set the text area width (height doesn't matter here)
	        setSize(new Dimension(colWidth, 1)); 

	        // get the text area preferred height and add the row margin
	        int height = getPreferredSize().height + table.getRowMargin();
	        // ensure the row height fits the cell with most lines
	        if (height != table.getRowHeight(row)) {
	            table.setRowHeight(row, height);
	            rowHeight = height;
	        }
	        return this;
    }

How can i implement an additional horizontal alignment? Many thanks in advance and best regards

Hotkey

[DarrylBurke]

A JTextArea is meant for unstyled text. For your requirement you need to use a JTextPane and apply appropriate style(s)

db

[Hotkey]

Thanks for the hint. But in JTextPane im Missing the setLineWrap(true) and setWrapStyleWord(true) Functions. How do i accomplish that with JTextPane?

[Hotkey]

Finally i managed it. Here's my solution of a Renderer with JTextPane:

	@Override
    public Component getTableCellRendererComponent(
                    JTable table,
                    Object value,
                    boolean isSelected,
                    boolean hasFocus,
                    int row,
                    int column) {
	        
		this.setText(value.toString());
		StyledDocument doc = this.getStyledDocument();
		SimpleAttributeSet center = new SimpleAttributeSet();
		StyleConstants.setAlignment(center, alignment); //alignment to be Set in Constructor (ex. StyleConstants.ALIGN_RIGHT)
		doc.setParagraphAttributes(0, doc.getLength(), center, false);
		this.setDocument(doc);
		
		int height = getPreferredSize().height + table.getRowMargin();
        if (height != table.getRowHeight(row)) {
            table.setRowHeight(row, height);
        }
		return this;
    }

Last thing: I've added the if (height != table.getRowHeight(row)) {...} because otherwise it seems that the method is called in an endless loop (maybe caused by the table.setRowHeight(...)). Although this works now: is there a general fault in my approach?