I'm certain this or similar has been asked here many times. I searched for it, but could not make the answers work.

During editing, I use a form which primary aim is to reduce mouse interaction during edit. A attribute value can be modified (using a QPlainTextEdit widget)

Now, after updating the value, I need to click a button on the form to trigger an update-script.

It would be a real time-saver if, upon entering the value, the return keypress would trigger that update-script.

In other words: I need to catch the return keypress on that widget.

internet searches and searches here offer this answer. code-excerpt:

from qgis.PyQt import uic
frm = uic.loadUi( 'F_ChkPt.ui')

##  code snipped

def cmd_bt_chk():
    #update script 
    c_layer = frm.bt_active.text()
    layer = QgsProject.instance().mapLayersByName( c_layer )[0]
    n_pt = int(frm.tb_pt.toPlainText())
    feature = layer.getFeature( n_pt)
    feature[ c_VELDCHK] = '1'
    feature[ c_VELD] = frm.tb_Hg.toPlainText()
class CustomPlainTextEdit(QPlainTextEdit):
    def keyPressEvent(self, event):
        if event.key() == Qt.Key_Return:
            cmd_bt_chk()               # update script
frm.bt_prev.clicked.connect( cmd_bt_prev)
frm.bt_next.clicked.connect( cmd_bt_next)
frm.bt_chk.clicked.connect( cmd_bt_chk)

frm.tb_Hg = CustomPlainTextEdit()         # << add the keypress to the widget ??

frm.bt_active.clicked.connect( cmd_bt_SetActiveLayer)


This does nothing & no error is raised I do not understand what 'frm.tb_Hg = CustomPlainTextEdit()' is supposed to accomplish

Can somebody point me in the right direction?

1 Answer 1


Assuming frm is a QWidget or QMainWindow, you should add new Widgets to it using a layout and its 'addWidget'-Method I tried your CustomPlainTextEdit and it works for me in the following example:

from qgis.utils import iface 

class CustomPlainTextEdit(QPlainTextEdit):
    def keyPressEvent(self, event):
        if event.key() == Qt.Key_Return:
form = QMainWindow(iface.mainWindow())
central_widget = QWidget()
layout = QVBoxLayout(central_widget)
label = CustomPlainTextEdit()


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