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POSwing resize slow/jumpy
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copied!<p>I made my own BottomBar with a simple gradient extending JComponent and adjusting the paintComponent() method.</p> <p>Then I add it to the SOUTH of my JFrame which uses BorderLayout.</p> <p>Everything looks correct at the beginning. When I resize the frame the BottomBar gets repainted and set to the new position correctly. The think is, it happens a few milliseconds to late, so that one can see the JFrame 's background for a second.</p> <p>The funny thing is, that when I set the execution environment to Java-SE 1.6 it works... (instead of 1.7) Also, Im running it on a mac, if that makes a difference.</p> <p><img src="https://i.stack.imgur.com/QAJGz.png" alt="Screenshot comparing window when resized and when not"></p> <hr> <h2>Code - JButton Example</h2> <pre><code>import java.awt.BorderLayout; import java.awt.EventQueue; import javax.swing.JButton; import javax.swing.JFrame; public class Main { public static void main(String args[]){ EventQueue.invokeLater(new Runnable() { @Override public void run() { JFrame frame = new JFrame("Resize Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new JButton(), BorderLayout.SOUTH); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } }); } } </code></pre> <hr> <h2>Code - BottomBar Example</h2> <p>Main:</p> <pre><code>public class Main { public static void main(String args[]){ Frame window = new Frame(); window.setSize(500, 400); window.setVisible(true); } } </code></pre> <p>Frame:</p> <pre><code>import java.awt.BorderLayout; import javax.swing.JFrame; public class Frame extends JFrame{ private static final long serialVersionUID = 1L; public Frame() { setLayout( new BorderLayout() ); getContentPane().add( BorderLayout.SOUTH, new BottomBar() ); } } </code></pre> <p>BottomBar</p> <pre><code>import java.awt.Color; import java.awt.Dimension; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import javax.swing.JComponent; public class BottomBar extends JComponent { private static final long serialVersionUID = 1L; public BottomBar() { setSize(200, 30); setPreferredSize( new Dimension(200, 30) ); } protected void paintComponent(Graphics g) { Graphics2D g2 = (Graphics2D)g; g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); GradientPaint gradient = new GradientPaint(0, 0, new Color(185, 185, 185), 0, getHeight() , new Color(151, 151, 151) ); g2.setPaint(gradient); g2.fillRect(0, 0, getWidth(), getHeight()); g2.setColor( new Color(64, 64, 64) ); g2.drawLine(0, 0, getWidth(), 0); g2.setColor( new Color(215, 215, 215) ); g2.drawLine(0, 1, getWidth(), 1); } } </code></pre>

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