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POHow to auto-adjust font size of multiple JLabel based on container size in a smooth way?
 

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  1. POHow to auto-adjust font size of multiple JLabel based on container size in a smooth way?
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    <p>I need to resize the font of multiple JLabel based on the scaling factor used to resize the container. To do this, I am setting the font of each JLabel to null so that they take the font of the container. It works, but it also produces strange results. </p> <p>To be specific, the text seems to "lag" behind the container and sometimes it gets even truncated. I would like to avoid this behavior. Any idea how?</p> <p>Example code simulating the behavior:</p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.Font; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.geom.AffineTransform; import javax.swing.BorderFactory; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JSlider; import javax.swing.SwingUtilities; import javax.swing.WindowConstants; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class TextResize implements Runnable { public static void main(String[] args) { TextResize example = new TextResize(); SwingUtilities.invokeLater(example); } public void run() { JFrame frame = new JFrame("JLabel Text Resize"); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.setPreferredSize(new Dimension(800, 400)); Container container = frame.getContentPane(); container.setLayout(new BorderLayout()); final JPanel labelContainer = new JPanel(new GridBagLayout()); labelContainer.setBorder(BorderFactory.createLineBorder(Color.black)); //initial font final Font textFont = new Font("Lucida Console", Font.PLAIN, 10).deriveFont(AffineTransform.getScaleInstance(1, 1)); labelContainer.setFont(textFont); GridBagConstraints c = new GridBagConstraints(); c.fill = GridBagConstraints.BOTH; c.insets = new Insets(0, 10, 0, 10); c.weightx = 1; for (int i = 0; i &lt; 5; i++) { JLabel f = new JLabel("Text here with possibly looooooooong words"); f.setBorder(BorderFactory.createLineBorder(Color.green)); f.setFont(null);//take the font from parent c.gridy = i; labelContainer.add(f, c); } JSlider slider = new JSlider(0,50000,10000); slider.addChangeListener(new ChangeListener() { double containerWidth = labelContainer.getPreferredSize().getWidth(); double containerHeight = labelContainer.getPreferredSize().getHeight(); @Override public void stateChanged(ChangeEvent ev) { JSlider source = (JSlider) ev.getSource(); double scale = (double) (source.getValue() / 10000d); //scaling the container labelContainer.setSize((int) (containerWidth * scale), (int) (containerHeight * scale)); //adjusting the font: why does it 'lag' ? why the truncation at times? Font newFont = textFont.deriveFont(AffineTransform.getScaleInstance(scale, scale)); labelContainer.setFont(newFont); //print (font.getSize() does not change?) System.out.println(scale + " " + newFont.getTransform() + newFont.getSize2D()); } }); container.add(slider, BorderLayout.NORTH); JPanel test = new JPanel(); test.setLayout(null); labelContainer.setBounds(5, 5, labelContainer.getPreferredSize().width, labelContainer.getPreferredSize().height); test.add(labelContainer); container.add(test, BorderLayout.CENTER); frame.pack(); frame.setVisible(true); } } </code></pre> <p>Picture: <a href="http://i.stack.imgur.com/tZLOO.png" rel="nofollow">http://i.stack.imgur.com/tZLOO.png</a></p> <p>Thanks,</p> <p>-s</p>
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