tell/plugins/BarcodeReaderPanel.java

import ch.psi.pshell.core.Context;
import ch.psi.pshell.swing.DevicePanel;
import ch.psi.utils.swing.SwingUtils;
import java.util.concurrent.CompletableFuture;

/**
 *
 */
public class BarcodeReaderPanel extends DevicePanel {

    volatile boolean enabled;
    public BarcodeReaderPanel() {
        initComponents();
        this.startTimer(100);
    }

    
    CompletableFuture future;
    
    @Override
    public void onTimer(){
        if ((getDevice()!=null) && enabled){
            if ((future==null) || (future.isDone())){
                future = Context.getInstance().evalLineBackgroundAsync("barcode_reader.get()");
            }
        }
    }
    
    
    void execute(String statement, boolean showReturn){
        try {
            Context.getInstance().evalLineBackgroundAsync(statement).handle((ret, ex) -> {
                if (BarcodeReaderPanel.this.isShowing()){
                    if (ex != null){
                        showException((Exception)ex);
                    } else if (showReturn){
                        if (ret == null){
                            SwingUtils.showMessage(this, "Return", "No code detected", 20000);
                        } else {
                            SwingUtils.showMessage(this, "Return", "Detected code: " +ret, 20000);
                        }
                    }
                }
                return ret;
            });
        } catch (Exception ex) {
            showException(ex);
        }        
    }
    
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jPanel3 = new javax.swing.JPanel();
        buttonEnable = new javax.swing.JButton();
        buttonDisable = new javax.swing.JButton();
        buttonRead = new javax.swing.JButton();
        deviceStatePanel1 = new ch.psi.pshell.swing.DeviceStatePanel();
        deviceValuePanel1 = new ch.psi.pshell.swing.DeviceValuePanel();

        jPanel3.setBorder(javax.swing.BorderFactory.createTitledBorder("Commands"));

        buttonEnable.setText("Enable");
        buttonEnable.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonEnableActionPerformed(evt);
            }
        });

        buttonDisable.setText("Disable");
        buttonDisable.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonDisableActionPerformed(evt);
            }
        });

        buttonRead.setText("Read");
        buttonRead.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buttonReadActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
        jPanel3.setLayout(jPanel3Layout);
        jPanel3Layout.setHorizontalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(buttonEnable)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(buttonDisable)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(buttonRead)
                .addContainerGap())
        );

        jPanel3Layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {buttonDisable, buttonEnable, buttonRead});

        jPanel3Layout.setVerticalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(buttonEnable)
                    .addComponent(buttonDisable)
                    .addComponent(buttonRead))
                .addContainerGap())
        );

        deviceStatePanel1.setDeviceName("barcode_reader");

        deviceValuePanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("Value"));
        deviceValuePanel1.setDeviceName("barcode_reader");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addComponent(deviceValuePanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addComponent(deviceStatePanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, 0)
                .addComponent(deviceValuePanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, 0)
                .addComponent(deviceStatePanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, 0))
        );
    }// </editor-fold>//GEN-END:initComponents

    private void buttonEnableActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonEnableActionPerformed
        execute("barcode_reader.enable()", false);
        enabled = true;
    }//GEN-LAST:event_buttonEnableActionPerformed

    private void buttonDisableActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonDisableActionPerformed
        enabled = false;
        execute("barcode_reader.disable()", false);
    }//GEN-LAST:event_buttonDisableActionPerformed

    private void buttonReadActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_buttonReadActionPerformed
        enabled = false;
        execute("barcode_reader.read(5.0) ", true);
    }//GEN-LAST:event_buttonReadActionPerformed

    
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton buttonDisable;
    private javax.swing.JButton buttonEnable;
    private javax.swing.JButton buttonRead;
    private ch.psi.pshell.swing.DeviceStatePanel deviceStatePanel1;
    private ch.psi.pshell.swing.DeviceValuePanel deviceValuePanel1;
    private javax.swing.JPanel jPanel3;
    // End of variables declaration//GEN-END:variables
}