[Qgis-developer] python form validation help

[Andrew]

I am trying to write some form validation to work around bug #15050
<http://hub.qgis.org/issues/15050>.  Based on some examples I have found I
think this should work:

from PyQt4.QtCore import *
from PyQt4.QtGui import *

myDialog = None
notesField = None

def formOpen(dialog,layerid,featureid):
    global myDialog
    global notesField

    myDialog = dialog
    notesField = dialog.findChild(QPlainTextEdit,"Notes")
    buttonBox = dialog.findChild(QDialogButtonBox,"buttonBox")

    # Disconnect the signal that QGIS has wired up for the dialog to the
button box.
    buttonBox.accepted.disconnect(myDialog.accept)
    # Wire up our own signals.
    buttonBox.accepted.connect(validate)
    #buttonBox.rejected.connect(myDialog.reject)

def validate():
    if notesField.document().characterCount() > 1000:
        msgBox = QMessageBox()
        msgBox.setText("Notes field must be <1000 characters")
        msgBox.exec_()
    else:
        myDialog.accept()

What happens is that I get the message box with the error, but when I click
OK on the message box the form closes and saves anyway and I still lose
text in the multiline field if it exceeds the field length.  How do I keep
the form open to allow the user to fix the error(s)?

Thanks,

Andrew
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