QLineEdit (Advanced)¶
When you use the Line Editor, you can apply different settings.
Let’s use the combobox to create a line editor that applies the settings related to echo mode, validation, alignment, input mask, read-only.
Example¶
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
class MyApp(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
# echo_group
self.echo_group = QGroupBox('Echo')
self.echo_label = QLabel('Mode:')
self.echo_cb = QComboBox()
self.echo_cb.addItem('Normal')
self.echo_cb.addItem('No Echo')
self.echo_cb.addItem('Password')
self.echo_cb.addItem('PasswordEchoOnEdit')
self.echo_le = QLineEdit()
self.echo_le.setPlaceholderText('Placeholder Text')
self.echo_le.setFocus()
# validator_group
self.validator_group = QGroupBox('Validator')
self.validator_label = QLabel('Type:')
self.validator_cb = QComboBox()
self.validator_cb.addItem('No validator')
self.validator_cb.addItem('Integer validator')
self.validator_cb.addItem('Double validator')
self.validator_le = QLineEdit()
self.validator_le.setPlaceholderText('Placeholder Text')
# alignment_group
self.alignment_group = QGroupBox('Alignment')
self.alignment_label = QLabel('Type:')
self.alignment_cb = QComboBox()
self.alignment_cb.addItem('Left')
self.alignment_cb.addItem('Centered')
self.alignment_cb.addItem('Right')
self.alignment_le = QLineEdit()
self.alignment_le.setPlaceholderText('Placeholder Text')
# input_mask_group
self.input_mask_group = QGroupBox('Input mask')
self.input_mask_label = QLabel('Type:')
self.input_mask_cb = QComboBox()
self.input_mask_cb.addItem('No mask')
self.input_mask_cb.addItem('Phone number')
self.input_mask_cb.addItem('ISO date')
self.input_mask_cb.addItem('License key')
self.input_mask_le = QLineEdit()
self.input_mask_le.setPlaceholderText('Placeholder Text')
# access_group
self.access_group = QGroupBox('Access')
self.access_label = QLabel('Type:')
self.access_cb = QComboBox()
self.access_cb.addItem('False')
self.access_cb.addItem('True')
self.access_le = QLineEdit()
self.access_le.setPlaceholderText('Placeholder Text')
# activated.connect
self.echo_cb.activated.connect(self.echo_changed)
self.validator_cb.activated.connect(self.validator_changed)
self.alignment_cb.activated.connect(self.alignment_changed)
self.input_mask_cb.activated.connect(self.input_mask_changed)
self.access_cb.activated.connect(self.access_changed)
# echo_layout
self.echo_layout = QGridLayout()
self.echo_layout.addWidget(self.echo_label, 0, 0)
self.echo_layout.addWidget(self.echo_cb, 0, 1)
self.echo_layout.addWidget(self.echo_le, 1, 0, 1, 2)
self.echo_group.setLayout(self.echo_layout)
# validator_layout
self.validator_layout = QGridLayout()
self.validator_layout.addWidget(self.validator_label, 0, 0)
self.validator_layout.addWidget(self.validator_cb, 0, 1)
self.validator_layout.addWidget(self.validator_le, 1, 0, 1, 2)
self.validator_group.setLayout(self.validator_layout)
# alignment_layout
self.alignment_layout = QGridLayout()
self.alignment_layout.addWidget(self.alignment_label, 0, 0)
self.alignment_layout.addWidget(self.alignment_cb, 0, 1)
self.alignment_layout.addWidget(self.alignment_le, 1, 0, 1, 2)
self.alignment_group.setLayout(self.alignment_layout)
# input_mask_layout
self.input_mask_layout = QGridLayout()
self.input_mask_layout.addWidget(self.input_mask_label, 0, 0)
self.input_mask_layout.addWidget(self.input_mask_cb, 0, 1)
self.input_mask_layout.addWidget(self.input_mask_le, 1, 0, 1, 2)
self.input_mask_group.setLayout(self.input_mask_layout)
# access_layout
self.access_layout = QGridLayout()
self.access_layout.addWidget(self.access_label, 0, 0)
self.access_layout.addWidget(self.access_cb, 0, 1)
self.access_layout.addWidget(self.access_le, 1, 0, 1, 2)
self.access_group.setLayout(self.access_layout)
# layout
self.layout = QGridLayout()
self.layout.addWidget(self.echo_group, 0, 0)
self.layout.addWidget(self.validator_group, 1, 0)
self.layout.addWidget(self.alignment_group, 2, 0)
self.layout.addWidget(self.input_mask_group,0, 1)
self.layout.addWidget(self.access_group, 1, 1)
self.setLayout(self.layout)
self.setWindowTitle('Line Editor')
self.show()
def echo_changed(self, index):
if index == 0:
self.echo_le.setEchoMode(QLineEdit.Normal)
elif index == 1:
self.echo_le.setEchoMode(QLineEdit.NoEcho)
elif index == 2:
self.echo_le.setEchoMode(QLineEdit.Password)
elif index == 3:
self.echo_le.setEchoMode(QLineEdit.PasswordEchoOnEdit)
def validator_changed(self, index):
if index == 0:
self.validator_le.setValidator(None)
elif index == 1:
self.validator_le.setValidator(QIntValidator(-99, 99))
elif index == 2:
double_validator = QDoubleValidator(-999.0, 999.0, 2)
double_validator.setNotation(QDoubleValidator.StandardNotation)
self.validator_le.setValidator(double_validator)
self.validator_le.clear()
def alignment_changed(self, index):
if index == 0:
self.alignment_le.setAlignment(Qt.AlignLeft)
elif index == 1:
self.alignment_le.setAlignment(Qt.AlignCenter)
elif index == 2:
self.alignment_le.setAlignment(Qt.AlignRight)
def input_mask_changed(self, index):
if index == 0:
self.input_mask_le.setInputMask('')
elif index == 1:
self.input_mask_le.setInputMask('000-0000-0000')
elif index == 2:
self.input_mask_le.setInputMask('0000-00-00')
self.input_mask_le.setText('20190410')
self.input_mask_le.setCursorPosition(0)
elif index == 3:
self.input_mask_le.setInputMask('>AAAAA-AAAAA-AAAAA-AAAAA;#')
def access_changed(self, index):
if index == 0:
self.access_le.setReadOnly(False)
elif index == 1:
self.access_le.setReadOnly(True)
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = MyApp()
sys.exit(app.exec_())
The widget contains one label and one QLineEdit widget. The label immediately displays the text that is entered and modified in the QLineEdit widget.
Description¶
# echo_group
self.echo_group = QGroupBox('Echo')
self.echo_label = QLabel('Mode:')
self.echo_cb = QComboBox()
self.echo_cb.addItem('Normal')
self.echo_cb.addItem('No Echo')
self.echo_cb.addItem('Password')
self.echo_cb.addItem('PasswordEchoOnEdit')
self.echo_le = QLineEdit()
self.echo_le.setPlaceholderText('Placeholder Text')
self.echo_le.setFocus()
Create a group box (echo_group) to contain widgets related to echo mode.
Create a label, a combobox, and a line-editor. Add items related to echo mode to the combo box.
For example, if you select ‘Password’, the text in the line editor is displayed in password mode.
Make the other four group boxes in a similar fashion.
# activated.connect
self.echo_cb.activated.connect(self.echo_changed)
self.validator_cb.activated.connect(self.validator_changed)
self.alignment_cb.activated.connect(self.alignment_changed)
self.input_mask_cb.activated.connect(self.input_mask_changed)
self.access_cb.activated.connect(self.access_changed)
Connect the signal that is released when each combo box is selected (activated) to each method.
# echo_layout
self.echo_layout = QGridLayout()
self.echo_layout.addWidget(self.echo_label, 0, 0)
self.echo_layout.addWidget(self.echo_cb, 0, 1)
self.echo_layout.addWidget(self.echo_le, 1, 0, 1, 2)
self.echo_group.setLayout(self.echo_layout)
Use the grid layout to place labels, comboboxes, and line editors, and set them as the layout of the Group Box.
# layout
self.layout = QGridLayout()
self.layout.addWidget(self.echo_group, 0, 0)
self.layout.addWidget(self.validator_group, 1, 0)
self.layout.addWidget(self.alignment_group, 2, 0)
self.layout.addWidget(self.input_mask_group,0, 1)
self.layout.addWidget(self.access_group, 1, 1)
self.setLayout(self.layout)
Use the grid layout to place five group boxes.
def echo_changed(self, index):
if index == 0:
self.echo_le.setEchoMode(QLineEdit.Normal)
elif index == 1:
self.echo_le.setEchoMode(QLineEdit.NoEcho)
elif index == 2:
self.echo_le.setEchoMode(QLineEdit.Password)
elif index == 3:
self.echo_le.setEchoMode(QLineEdit.PasswordEchoOnEdit)
The echo_changed method is executed when Echo Combo Box (echo_cb) is selected.
If you select the first item (‘Normal’), use setEchoMode() to set the line editor to Normal mode. If you select the third item (‘Password’), it will be in password mode.
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