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POJava swing hold buttons
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  1. POJava swing hold buttons
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    copied!<p>I'm trying to create a subclass of JButton or AbstractButton that would call specified .actionPerformed as long as the mouse is held down on the button.</p> <p>So far I was thinking of extending JButton, adding a mouse listener on creation (inside constructor) and calling actionPerformed while the mouse is down. So far i came up with that but I was wondwering if I was on the right track and if so, how to correctly implement the "held down" logic.</p> <pre><code>package components; import java.awt.event.ActionEvent; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.Action; import javax.swing.Icon; import javax.swing.JButton; public class HoldButton extends JButton { private class HeldDownMouseListener implements MouseListener { private boolean mouseIsHeldDown; private HoldButton button; private long millis; public HeldDownMouseListener(HoldButton button, long millis) { this.button = button; this.millis = millis; } @Override public void mouseClicked(MouseEvent arg0) { } @Override public void mouseEntered(MouseEvent arg0) { } @Override public void mouseExited(MouseEvent arg0) { } @Override public void mousePressed(MouseEvent arg0) { mouseIsHeldDown = true; // This should be run in a sub thread? // while (mouseIsHeldDown) { // button.fireActionPerformed(new ActionEvent(button, ActionEvent.ACTION_PERFORMED, "heldDown")); // try { // Thread.sleep(millis); // } catch (InterruptedException e) { // e.printStackTrace(); // continue; // } // } } @Override public void mouseReleased(MouseEvent arg0) { mouseIsHeldDown = false; } } public HoldButton() { addHeldDownMouseListener(); } public HoldButton(Icon icon) { super(icon); addHeldDownMouseListener(); } public HoldButton(String text) { super(text); addHeldDownMouseListener(); } public HoldButton(Action a) { super(a); addHeldDownMouseListener(); } private void addHeldDownMouseListener() { addMouseListener(new HeldDownMouseListener(this, 300)); } } </code></pre> <p>Thanks a lot for your time.</p> <p>edit: Choosing the Timer method I came up with a working implementation:</p> <pre><code>package components; import java.awt.event.ActionEvent; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.util.Timer; import java.util.TimerTask; import javax.swing.Action; import javax.swing.Icon; import javax.swing.JButton; public class HoldButton extends JButton { private static final long serialVersionUID = 1L; public static final long CLICK_LAG = 300; public static final long INITIAL_FIRE_DELAY = 500; public static final double FIRE_DELAY_STEP_MULTIPLIER = 25; public static final long MIN_FIRE_DELAY = 100; private class HeldDownMouseListener implements MouseListener { private class HeldDownCheckerTask extends TimerTask { private HeldDownMouseListener listener; public HeldDownCheckerTask(HeldDownMouseListener listener) { this.listener = listener; } @Override public void run() { long delay = INITIAL_FIRE_DELAY; while (listener.isMouseHeldDownOnButton()) { listener.fireMouseHeldDown(); try { Thread.sleep(delay); } catch (InterruptedException e) { e.printStackTrace(); } if (delay &gt; MIN_FIRE_DELAY) { final long decrease = Math.round(FIRE_DELAY_STEP_MULTIPLIER * Math.pow(INITIAL_FIRE_DELAY / delay, 2)); delay = Math.max(delay - decrease, MIN_FIRE_DELAY); } } } } private boolean mouseIsHeldDown; private boolean mouseIsOnButton; private HoldButton button; private Timer timer; public HeldDownMouseListener(HoldButton button) { this.button = button; } public boolean isMouseHeldDownOnButton() { return mouseIsHeldDown &amp;&amp; mouseIsOnButton; } private void cancelTimer() { if (timer != null) { timer.cancel(); timer = null; } } private void fireMouseHeldDown() { button.fireActionPerformed(new ActionEvent(button, ActionEvent.ACTION_PERFORMED, "heldDown")); } @Override public void mouseClicked(MouseEvent arg0) { cancelTimer(); } @Override public void mouseEntered(MouseEvent arg0) { mouseIsOnButton = true; } @Override public void mouseExited(MouseEvent arg0) { mouseIsOnButton = false; } @Override public void mousePressed(MouseEvent arg0) { cancelTimer(); mouseIsHeldDown = true; timer = new Timer(); timer.schedule(new HeldDownCheckerTask(this), CLICK_LAG); } @Override public void mouseReleased(MouseEvent arg0) { mouseIsHeldDown = false; } } public HoldButton() { addHeldDownMouseListener(); } public HoldButton(Icon icon) { super(icon); addHeldDownMouseListener(); } public HoldButton(String text) { super(text); addHeldDownMouseListener(); } public HoldButton(Action a) { super(a); addHeldDownMouseListener(); } private void addHeldDownMouseListener() { addMouseListener(new HeldDownMouseListener(this)); } } </code></pre>
 

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