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POCan not edit the text of a JTextField inside a JPanel within a JWindow
 

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    <p><img src="https://i.stack.imgur.com/8Tfzd.png" alt="enter image description here"></p> <p>This is in continuation of my previous question where I asked how to place something in the system tray.<br> After some help from the community, I could do that. However what I am unable to do is to change the text of the <code>JTextField</code> in the <code>JWindow</code>. </p> <p>The <code>JWindow</code> has a <code>JPanel</code> and everything is placed within the <code>JPanel</code>, including the <code>JTextField</code> of <strong>Remind Mt At</strong>. However I am unable to type anything in it even though <code>setEditable(true)</code>.<br> The <code>JTextField</code> receives events properly as it is supposed to be white when the mouse enters and go back to default color when mouse exits. </p> <p>Is there any workaround for this? </p> <hr> <h2> SSCCE </h2> <pre><code>package demo; import java.awt.*; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.io.InputStream; import javax.imageio.ImageIO; import javax.sound.sampled.*; import javax.swing.*; import javax.swing.border.BevelBorder; import example.Kernel32; public class SSCCE { JPopupMenu popup = new JPopupMenu(); JMenuItem exit = new JMenuItem("Exit"); JWindow window = new JWindow(); JPanel panel = new JPanel(); int remindMeAt = 55; Kernel32.SYSTEM_POWER_STATUS batteryStatus = new Kernel32.SYSTEM_POWER_STATUS(); Clip buzzer; AudioInputStream in; JLabel ACLineStatus = new JLabel(); JLabel batteryCharge = new JLabel(); JTextField enterReminder = new JTextField(3); Color defaultColor; String onACPower; String charge; String status; boolean keepLooping = true; boolean doRemind = true; boolean isCharging; boolean aboveThreshold; boolean remindedOnce = false; //------------------------------------------------------------------------------ public static void main(String[] args) { new SSCCE(); } //------------------------------------------------------------------------------ public SSCCE(){ if(SystemTray.isSupported()){ setupGUI(); } } //------------------------------------------------------------------------------ public void setupGUI(){ try{ UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); InputStream in = BatteryBeeperSystemTray.class. getResourceAsStream("/images/battery_smaller.png"); TrayIcon t = new TrayIcon(ImageIO.read(in)); t.setToolTip("BatteryBeeper"); SystemTray.getSystemTray().add(t); }catch(Exception e){ } panel.setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); defaultColor = window.getBackground(); Kernel32.INSTANCE.GetSystemPowerStatus(batteryStatus); onACPower = batteryStatus.getACLineStatusString(); charge = batteryStatus.getBatteryLifePercent(); if(onACPower.equalsIgnoreCase("offline")){ onACPower = "Battery"; }else{ onACPower = "AC Power"; charge = "---"; } ACLineStatus.setText(onACPower); ACLineStatus.setPreferredSize(new Dimension(150,40)); ACLineStatus.setBorder(BorderFactory.createTitledBorder("Operating On")); gbc.gridx = 0; gbc.gridy = 0; gbc.gridwidth = 7; gbc.gridheight = 1; gbc.fill = GridBagConstraints.BOTH; panel.add(ACLineStatus,gbc); batteryCharge.setText(charge); batteryCharge.setBorder(BorderFactory.createTitledBorder("Current " + "Charge")); gbc.gridy++; panel.add(batteryCharge,gbc); panel.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED)); gbc.gridy++; enterReminder.setEditable(true); enterReminder.requestFocusInWindow(); enterReminder.setText(Integer.toString(remindMeAt)); enterReminder.addMouseListener(new TextHandler()); enterReminder.setBackground(window.getBackground()); enterReminder.setBorder(BorderFactory.createTitledBorder("Remind Me" + " At")); panel.add(enterReminder,gbc); window.add(panel); window.pack(); window.setLocationRelativeTo(null); window.setVisible(true); } //------------------------------------------------------------------------------ public void checkIfReminderChanged(){ //TODO DEFINE } //------------------------------------------------------------------------------ public class TextHandler extends MouseAdapter{ @Override public void mouseEntered(MouseEvent e){ enterReminder.setBackground(Color.WHITE); } //------------------------------------------------------------------------------ @Override public void mouseExited(MouseEvent e){ enterReminder.setBackground(defaultColor); checkIfReminderChanged(); } } //------------------------------------------------------------------------------ } </code></pre> <hr> <h2> What you also need </h2> <pre><code>package example; import com.sun.jna.Native; import com.sun.jna.Structure; import com.sun.jna.win32.StdCallLibrary; import java.util.*; public interface Kernel32 extends StdCallLibrary { public Kernel32 INSTANCE = (Kernel32) Native.loadLibrary("Kernel32", Kernel32.class); /** * @see http://msdn2.microsoft.com/en-us/library/aa373232.aspx */ public class SYSTEM_POWER_STATUS extends Structure { public byte ACLineStatus; public byte BatteryFlag; public byte BatteryLifePercent; public byte Reserved1; public int BatteryLifeTime; public int BatteryFullLifeTime; @Override protected List&lt;String&gt; getFieldOrder() { ArrayList&lt;String&gt; fields = new ArrayList&lt;String&gt;(); fields.add("ACLineStatus"); fields.add("BatteryFlag"); fields.add("BatteryFullLifeTime"); fields.add("BatteryLifePercent"); fields.add("BatteryLifeTime"); fields.add("Reserved1"); return fields; } /** * The AC power status */ public String getACLineStatusString() { switch (ACLineStatus) { case (0): return "Offline"; case (1): return "Online"; default: return "Unknown"; } } /** * The battery charge status */ public String getBatteryFlagString() { switch (BatteryFlag) { case (1): return "High, more than 66 percent"; case (2): return "Low, less than 33 percent"; case (4): return "Critical, less than five percent"; case (8): return "Charging"; case ((byte) 128): return "No system battery"; default: return "Unknown"; } } /** * The percentage of full battery charge remaining */ public String getBatteryLifePercent() { return (BatteryLifePercent == (byte) 255) ? "Unknown" : BatteryLifePercent + "%"; } /** * The number of seconds of battery life remaining */ public String getBatteryLifeTime() { return (BatteryLifeTime == -1) ? "Unknown" : BatteryLifeTime + " seconds"; } /** * The number of seconds of battery life when at full charge */ public String getBatteryFullLifeTime() { return (BatteryFullLifeTime == -1) ? "Unknown" : BatteryFullLifeTime + " seconds"; } @Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append("ACLineStatus: " + getACLineStatusString() + "\n"); sb.append("Battery Flag: " + getBatteryFlagString() + "\n"); sb.append("Battery Life: " + getBatteryLifePercent() + "\n"); sb.append("Battery Left: " + getBatteryLifeTime() + "\n"); sb.append("Battery Full: " + getBatteryFullLifeTime() + "\n"); return sb.toString(); } } public int GetSystemPowerStatus(SYSTEM_POWER_STATUS result); } </code></pre>
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    1. COGood Experiment. Can you provide a runnable code in your question. I couldn't find anything wrong in your code.
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    2. COFor better help sooner, post an [SSCCE](http://sscce.org/).
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    3. COWhat is your "TextHandler" doing?
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