How to build a JTree with nodes multi-line Windows L and am FJt

Although I already found 2 ways to build nodes multi-line JTree but both methods work very well in Java by default appearance and when I change my windows look and feel then it fails. I can't understand what is the problem. The two ways by which I build multi line nodes are:

First: Using html in nodes
as the DOSB linea < br > < html > < / html >

Secondly: By implementing TreeRenderer and change it accordingly, such a class is given below
class ModifiedTreeCellRenderer extends JPanel implements TreeCellRenderer {
    protected JLabel icon;
    protected TreeTextArea text;
    
    public ModifiedTreeCellRenderer() {
        setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
        icon = new JLabel() {
            @Override
            public void setBackground(Color color) {
                if (color instanceof ColorUIResource)
                color = null;
                super.setBackground(color);
            }
        };
        add(icon);
        add(Box.createHorizontalStrut(4));
        add(text = new TreeTextArea());
    }
    
    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean isSelected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        String stringValue = tree.convertValueToText(value, isSelected, expanded, leaf, row, hasFocus);
        setEnabled(tree.isEnabled());
        text.setText(stringValue);
        text.setSelect(isSelected);
        text.setFocus(hasFocus);
        if (leaf) {
            icon.setIcon(UIManager.getIcon("Tree.leafIcon"));
        } else if (expanded) {
            icon.setIcon(UIManager.getIcon("Tree.openIcon"));
        } else {
            icon.setIcon(UIManager.getIcon("Tree.closedIcon"));
        }
        return this;
    }

    @Override
    public Dimension getPreferredSize() {
        Dimension iconD = icon.getPreferredSize();
        Dimension textD = text.getPreferredSize();
        int height = iconD.height < textD.height ? textD.height : iconD.height;
        return new Dimension(iconD.width + textD.width, height);
    }

    @Override
    public void setBackground(Color color) {
        if (color instanceof ColorUIResource)
            color = null;
        super.setBackground(color);
    }

    class TreeTextArea extends JTextArea {
        Dimension preferredSize;
        
        TreeTextArea() {
            setLineWrap(true);
            setWrapStyleWord(true);
            setOpaque(true);
        }

        @Override
        public void setBackground(Color color) {
            if (color instanceof ColorUIResource)
            color = null;
            super.setBackground(color);
        }

        @Override
        public void setPreferredSize(Dimension d) {
            if (d != null) {
            preferredSize = d;
            }
        }

        @Override
        public Dimension getPreferredSize() {
            return preferredSize;
        }

        @Override
        public void setText(String str) {
            FontMetrics fm = getToolkit().getFontMetrics(getFont());
            BufferedReader br = new BufferedReader(new StringReader(str));
            String line;
            int maxWidth = 0, lines = 0;
            try {
                while ((line = br.readLine()) != null) {
                    int width = SwingUtilities.computeStringWidth(fm, line);
                    if (maxWidth < width) {
                        maxWidth = width;
                    }
                    lines++;
                }
            } catch (IOException ex) {
                System.out.println(ex);
            }
            lines = (lines < 1) ? 1 : lines;
            int height = fm.getHeight() * lines;
            setPreferredSize(new Dimension(maxWidth + 6, height));
            super.setText(str);
        }

        void setSelect(boolean isSelected) {
            Color bColor;
            if (isSelected) {
                bColor = UIManager.getColor("Tree.selectionBackground");
            } else {
                bColor = UIManager.getColor("Tree.textBackground");
            }
            super.setBackground(bColor);
        }

        void setFocus(boolean hasFocus) {
            if (hasFocus) {
                Color lineColor = UIManager.getColor("Tree.selectionBorderColor");
                setBorder(BorderFactory.createLineBorder(lineColor));
            } else {
                setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
            }
        }
    }
}
  
but the two methods in the event of failure in a Windows look and feel, can anyone help with this?

Published by: user8978073 on April 30, 2011 10:24

Published by: user8978073 on April 30, 2011 10:25

Can't check right now, but - afair, windowsLAF sets the rowHeight to a fixed value (16 or 18 or something like that). Consult the setRowHeight and make sure that there<= 0="" to="" indicate="" that="" it="" should="" be="">

Tags: Java

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