setText() is not always updating Jtextfield and Jlabel items

From	Kevin Nathan <knathan@project54.com>
Newsgroups	comp.lang.java.gui
Subject	setText() is not always updating Jtextfield and Jlabel items
Date	2015-02-26 13:23 -0700
Message-ID	<20150226132317.6bbbc29a@efreet.linux> (permalink)

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I could use some direction about where to look for this. I am still
pretty new to Java. I have a user input screen with multiple
JTextFields for user input and matching JLabels for informational
output for users. 

This is for a livestock auction system. While the animals are moving
around on the scale, the scale instrument (a serial port device)
returns an indication of "motion" that we want to show to the user.
When the motion goes away, the actual weight gets written to the Weight
JTextField. However, during the motion (which can be anywhere from
non-existent to many seconds) we want to write "Motion" in the
textfield and the actual, changing, weights in the label field. This is
what is not happening. After the motion stops, the true weight does get
written correctly, using setText().

The serial port routine returns an error code of -2 if there is motion
(and several other error codes that are handled correctly) and that is
what I am using. Here are some code snippets to show what is being
attempted, I hope it's enough to make sense:


MainScreen class:
-----------------

// Trying new "Motion" routine:
while (clerkFuncs.scaleErr == -2) {
    weight = clerkFuncs.readScale(tr);
    showMotion(weight);
}


private void showMotion(long wt) {

    noteField[1][weightRow].setText(Long.toString(wt));
    // noteField[1][weightRow].setText("<html><font
    color='red'>Motion</font></html>");

    editField[1][weightRow].setText("Motion");
}


ClerkFuncs class:
-----------------

// weight and weightStr are global in ClerkFuncs. I don't like it
// but that's how it was written.

public long readScale(TransClass tr) {
    clearScaleReturns(); // clears weight string and error var

    if (!scale.scalePortErr) {
        getAutoWeight();
        checkForWeightErrors();
    } else { // manual weight entry
        getManualWeight();
    }
    return (weight);
}


private void getAutoWeight() {
    scale.startScale();
    
    do {
        weightStr = scale.getWeight();
    } while (scale.getStatus() && weightStr.equals(""));

    scale.stopScale();
}


private void checkForWeightErrors() {
    scaleErr = scale.scaleErr;
    try {
        String trimmed = weightStr.trim();
        if (!trimmed.isEmpty()) {
            weight = Long.parseLong(trimmed);
        } else {
            weight = 0L;
        }
    } catch (NumberFormatException ex) {
        System.out.println("checkForWeightErrors Exception: " + ex);
        System.out.println("weightStr: [" + weightStr + "]");
        scaleErr = -3; // bad scale return
        weight = 0L;
    }
}

I am completely puzzled why "setText" does not work in this instance,
but works everywhere else I am using it. Thanks for any help, or
pointers to pages that may help me to understand this


-- 
Kevin Nathan (Arizona, USA)  
Linux is not a destination, it's a journey -- enjoy the trip!

Linux 3.7.10-1.45-desktop
 12:49pm  up 7 days  3:18,  18 users,  load average: 0.38, 0.46, 0.74

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setText() is not always updating Jtextfield and Jlabel items Kevin Nathan <knathan@project54.com> - 2015-02-26 13:23 -0700
  Re: setText() is not always updating Jtextfield and Jlabel items Jeff Higgins <jeff@invalid.invalid> - 2015-02-26 19:43 -0500
    Re: setText() is not always updating Jtextfield and Jlabel items Kevin Nathan <knathan@project54.com> - 2015-02-27 08:21 -0700
  Re: setText() is not always updating Jtextfield and Jlabel items Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2015-02-26 20:05 -0800
    Re: setText() is not always updating Jtextfield and Jlabel items Kevin Nathan <knathan@project54.com> - 2015-02-27 08:24 -0700
  Re: setText() is not always updating Jtextfield and Jlabel items Nigel Wade <nmw@ion.le.ac.uk> - 2015-02-27 15:45 +0000
    Re: setText() is not always updating Jtextfield and Jlabel items Kevin Nathan <knathan@project54.com> - 2015-03-02 09:33 -0700

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