I am using a QVBox layout and there are two widgets and a dynamic layout 'layout2' in the layout. Widget1 is fixed on top Widget3 is fixed at the bottom and widget2 is dynamic widget. layout2 is deleted and added each time. The problem here is I am not able to position the widget3 at the bottom as layout2 layout is deleted Widget3 moves to the top. Below is the sample code.
class Screen(QWidget):
def __init__(self):
super(Screen, self).__init__()
self.main_layout = QVBoxLayout()
widget1 = QPushButton("Text1")
#self.widget2 = QWidget()
widget3 = QLabel("Text3")
self.widget2_layout = QHBoxLayout()
widget2_label = QLabel("text2")
self.widget2_layout.addWidget(widget2_label)
#self.widget2.setLayout(self.widget2_layout)
self.main_layout.addWidget(widget1,Qt.AlignTop)
self.main_layout.addLayout(self.widget2_layout)
self.main_layout.addWidget(widget3,Qt.AlignBottom)
widget1.clicked.connect(self.change_widget2)
self.setLayout(self.main_layout)
self.show()
def clearLayout(self,layout):
item = layout.takeAt(0)
while item:
w = item.widget()
if w:
w.deleteLater()
lay = item.layout()
if lay:
self.clearLayout(item.layout())
item = layout.takeAt(0)
def change_widget2(self):
self.clearLayout(self.widget2_layout)
self.widget2_layout = QHBoxLayout()
widget2_label = QLabel("text changed")
self.widget2_layout.addWidget(widget2_label)
self.main_layout.addLayout(self.widget2_layout)
app = QApplication(sys.argv)
Gui = Screen()
sys.exit(app.exec_())
I have tried addstretch, dummy additional layout and nothing worked.
If you only want to change the widget that is in the second position it is not necessary to delete create a new layout, it is only necessary to reuse it, in the following example we see how the widget is changing:
class Screen(QWidget):
def __init__(self):
super(Screen, self).__init__()
self.setLayout(QVBoxLayout())
widget1 = QPushButton("Text1", self)
widget3 = QLabel("Text3", self)
self.widget2_layout = QHBoxLayout()
self.change_widget2()
self.layout().addWidget(widget1)
self.layout().addLayout(self.widget2_layout)
self.layout().addWidget(widget3)
widget1.clicked.connect(self.change_widget2)
def clearLayout(self, layout):
item = layout.takeAt(0)
while item:
w = item.widget()
if w:
w.deleteLater()
lay = item.layout()
if lay:
self.clearLayout(item.layout())
item = layout.takeAt(0)
def change_widget2(self):
self.clearLayout(self.widget2_layout)
# change the widget.
import random
widgets = [QLabel, QLineEdit, QPushButton]
widget2 = widgets[random.randint(0, len(widgets)-1)]("widget2", self)
self.widget2_layout.addWidget(widget2)
Related
I have a widget which contains three labels and three lineedits. I would like all lineedits to be aligned vertically directly after the longest label.
Here is my class:
class ScaleDisplayWidget(QWidget):
def __init__(self, parent=None):
super(ScaleDisplayWidget, self).__init__(parent)
self.setFixedSize(400, 200)
self.initUI()
self.update(0, 0, 0)
def initUI(self):
'''
Setup GUI elements of scale window
'''
mainLayout = QVBoxLayout()
hLayout = QHBoxLayout()
hLayout.setSpacing(0)
self.dx_label = QLabel('DX:')
self.dx_label.setFixedWidth(80)
self.dx_edit = QLineEdit()
self.dx_edit.setReadOnly(True)
self.dx_edit.setFocus(True)
self.dx_edit.setFixedWidth(150)
hLayout.addWidget(self.dx_label)
hLayout.addWidget(self.dx_edit)
h2Layout = QHBoxLayout()
h2Layout.setSpacing(0)
self.dy_label = QLabel('DY:')
self.dy_label.setFixedWidth(80)
self.dy_edit = QLineEdit()
self.dy_edit.setReadOnly(True)
self.dy_edit.setFocus(True)
self.dy_edit.setFixedWidth(150)
h2Layout.addWidget(self.dy_label)
h2Layout.addWidget(self.dy_edit)
h3Layout = QHBoxLayout()
h3Layout.setSpacing(0)
self.dist_label = QLabel('Distance:')
self.dist_label.setFixedWidth(80)
self.dist_edit = QLineEdit()
self.dist_edit.setReadOnly(True)
self.dist_edit.setFocus(True)
self.dist_edit.setFixedWidth(150)
h3Layout.addWidget(self.dist_label)
h3Layout.addWidget(self.dist_edit)
mainLayout.addLayout(hLayout)
mainLayout.addLayout(h2Layout)
mainLayout.addLayout(h3Layout)
self.setLayout(mainLayout)
self.show()
def update(self, dx, dy, dist):
self.dx_edit.setText(str(dx))
self.dy_edit.setText(str(dy))
self.dist_edit.setText(str(dist))
In this case I'm aiming to have all lineedits aligned directly after the distance label (maybe add 5 pixels or something small of padding). I have tried using setContentsMargins(0,0,0,0) on all the layouts but it hasn't changed anything.
Use a QFormLayout instead:
self.dx_edit = QLineEdit()
self.dx_edit.setReadOnly(True)
self.dx_edit.setFocus(True)
self.dx_edit.setFixedWidth(150)
self.dy_edit = QLineEdit()
self.dy_edit.setReadOnly(True)
self.dy_edit.setFocus(True)
self.dy_edit.setFixedWidth(150)
self.dist_edit = QLineEdit()
self.dist_edit.setReadOnly(True)
self.dist_edit.setFocus(True)
self.dist_edit.setFixedWidth(150)
layout = QFormLayout(self)
layout.addRow("DX", self.dx_edit)
layout.addRow("DY", self.dy_edit)
layout.addRow("Distance", self.dist_edit)
You might need to set the label align to left with layout.setLabelAlignment(Qt.AlignLeft)
I have several tabs and inside the "admin" tab I want to display two pages: one locked page (before entering credentials) and another unlocked page (after successful login). To do this, I'm using a QStackedWidget() to switch between the two pages. I have created a locked login screen but can't seem to move the object to the center of the page.
I have looked at moving widgets inside QStackedWidget and centering widgets in the center of the screen but my objects do not seem to change position. I've tried to move the entire internal widget using move() to the center of the screen using the desktop dimension and the parent widget to no avail. How would I be able to move the login fields to the center of the page? Thanks!
Current:
Desired:
Code:
from PyQt4 import QtGui, QtCore
# from load_CSS import load_CSS
# from widgets import UniversalPlotWidget
import sys
import time
def exit_application():
"""Exit program event handler"""
sys.exit(1)
class VerticalTabBar(QtGui.QTabBar):
def __init__(self, width, height, parent=None):
super(VerticalTabBar, self).__init__(parent)
self.width = width
self.height = height
def tabSizeHint(self, index):
return QtCore.QSize(self.width, self.height)
def paintEvent(self, event):
painter = QtGui.QStylePainter(self)
tab_options = QtGui.QStyleOptionTab()
for tab in range(self.count()):
self.initStyleOption(tab_options, tab)
painter.drawControl(QtGui.QStyle.CE_TabBarTabShape, tab_options)
painter.save()
size = tab_options.rect.size()
size.transpose()
rectangle = QtCore.QRect(QtCore.QPoint(), size)
rectangle.moveCenter(tab_options.rect.center())
tab_options.rect = rectangle
center = self.tabRect(tab).center()
painter.translate(center)
painter.rotate(90)
painter.translate(-center)
painter.drawControl(QtGui.QStyle.CE_TabBarTabLabel, tab_options);
painter.restore()
class TabWidget(QtGui.QTabWidget):
def __init__(self, *args, **kwargs):
QtGui.QTabWidget.__init__(self, *args, **kwargs)
self.setTabBar(VerticalTabBar(kwargs.pop('width'), kwargs.pop('height')))
self.setTabPosition(QtGui.QTabWidget.West)
self.setTabShape(QtGui.QTabWidget.Rounded)
class AdminTabWidget(QtGui.QWidget):
def __init__(self, parent=None):
super(AdminTabWidget, self).__init__(parent)
self.setWindowModality(QtCore.Qt.ApplicationModal)
self.setWindowFlags(QtCore.Qt.FramelessWindowHint)
self.admin_page_locked_init()
self.admin_page_unlocked_init()
self.admin_page_layout = QtGui.QGridLayout()
self.admin_page_switch = QtGui.QStackedWidget()
self.admin_page_switch.addWidget(self.admin_locked_tab)
self.admin_page_switch.addWidget(self.admin_unlocked_tab)
self.admin_page_switch.setCurrentIndex(0)
self.admin_page_layout.addWidget(self.admin_page_switch,0,0)
def admin_page_locked_init(self):
self.admin_locked_tab = QtGui.QWidget()
self.admin_locked_tab.setFixedSize(550,225)
self.admin_locked_layout = QtGui.QGridLayout()
self.username_label = QtGui.QLabel('Username: ')
self.username_field = QtGui.QLineEdit()
self.username_field.returnPressed.connect(self.verify_credentials)
self.space_label = QtGui.QLabel(' ')
self.space_label.setFixedHeight(25)
self.password_label = QtGui.QLabel('Password: ')
self.password_field = QtGui.QLineEdit()
self.password_field.returnPressed.connect(self.verify_credentials)
self.password_field.setEchoMode(QtGui.QLineEdit.Password)
self.verify_button = QtGui.QPushButton('Ok')
self.verify_button.clicked.connect(self.verify_credentials)
self.cancel_button = QtGui.QPushButton('Cancel')
self.cancel_button.clicked.connect(self.unauthorized)
self.status_label = QtGui.QLabel('')
self.status_label.setAlignment(QtCore.Qt.AlignCenter)
self.button_layout = QtGui.QGridLayout()
self.button_layout.addWidget(self.verify_button,0,0,1,1)
self.button_layout.addWidget(self.cancel_button,0,1,1,1)
self.admin_locked_layout.addWidget(self.username_label,0,0,1,1)
self.admin_locked_layout.addWidget(self.username_field,0,1,1,1)
self.admin_locked_layout.addWidget(self.space_label,1,0,1,3)
self.admin_locked_layout.addWidget(self.password_label,2,0,1,1)
self.admin_locked_layout.addWidget(self.password_field,2,1,1,1)
self.admin_locked_layout.addWidget(self.status_label,3,0,1,3)
self.admin_locked_layout.addLayout(self.button_layout,4,0,1,3)
self.admin_locked_tab.setLayout(self.admin_locked_layout)
def verify_credentials(self):
print('button pressed')
# Grab username/password from input fields
self.username = str(self.username_field.text())
self.password = str(self.password_field.text())
self.status_label.setText('Verifying')
self.status_label.setStyleSheet('QLabel {color: rgb(117,255,161)}')
self.spin(.001)
print('verified')
def spin(self, seconds):
"""Pause for set amount of seconds, replaces time.sleep so program doesnt stall"""
time_end = time.time() + seconds
while time.time() < time_end:
QtGui.QApplication.processEvents()
def unauthorized(self):
print('unauthorized')
self.status_label.setText('Invalid username and/or password')
self.status_label.setStyleSheet('QLabel {color: rgb(255,65,106)}')
def admin_page_unlocked_init(self):
self.admin_unlocked_tab = QtGui.QWidget()
admin_unlocked_layout = QtGui.QGridLayout()
admin_unlocked_button = QtGui.QPushButton('unlocked')
admin_unlocked_layout.addWidget(admin_unlocked_button)
self.admin_unlocked_tab.setLayout(admin_unlocked_layout)
def get_admin_page_layout(self):
return self.admin_page_layout
if __name__ == '__main__':
# Create main application window
app = QtGui.QApplication(sys.argv)
# app.setStyleSheet(load_CSS(1))
app.setStyle(QtGui.QStyleFactory.create("Cleanlooks"))
font = QtGui.QFont('Ubuntu', 20)
font.setWeight(70)
app.setFont(font)
screen_height = QtGui.QApplication.desktop().screenGeometry().height()
main_window_tab = TabWidget(width=300, height=screen_height/8)
main_window_tab.setWindowTitle("Tab Layout")
main_window_tab.setWindowFlags(QtCore.Qt.FramelessWindowHint)
main_window_tab.showMaximized()
tab1 = QtGui.QWidget()
tab2 = QtGui.QWidget()
tab3 = QtGui.QWidget()
tab4 = QtGui.QWidget()
tab5 = QtGui.QWidget()
tab6 = QtGui.QWidget()
tab7 = QtGui.QWidget()
admin_tab = QtGui.QWidget()
admin_tab_widget = AdminTabWidget()
admin_tab.setLayout(admin_tab_widget.get_admin_page_layout())
main_window_tab.addTab(admin_tab, "Admin")
main_window_tab.addTab(tab1, "tab1")
main_window_tab.addTab(tab2, "tab2")
main_window_tab.addTab(tab3, "tab3")
main_window_tab.addTab(tab4, "tab4")
main_window_tab.addTab(tab5, "tab5")
main_window_tab.addTab(tab6, "tab6")
main_window_tab.addTab(tab7, "tab7")
main_window_tab.show()
QtGui.QShortcut(QtGui.QKeySequence('Ctrl+Q'), main_window_tab, exit_application)
sys.exit(app.exec_())
The idea is to set the QStackedWidget with the Qt::AlignCenter alignment in the layout so it changes:
self.admin_page_layout.addWidget(self.admin_page_switch, 0, 0)
to:
self.admin_page_layout.addWidget(self.admin_page_switch, 0, 0, alignment=QtCore.Qt.AlignCenter)
When I decrease the window size all the widgets disappear.I want the widgets to move along when size is decreased.How do I solve this problem?
I have a drop-down menu from which a value is selected.When an "Add cmd" button is pressed the value is added to edit box.
Thanks in advance.
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
class tabdemo(QTabWidget):
def __init__(self, parent = None):
super(tabdemo, self).__init__(parent)
self.setGeometry(50, 50, 400,400)
QShortcut(QKeySequence("Esc"), self, self.close)
self.tab1 = QWidget()
self.tab2 = QWidget()
self.addTab(self.tab1,"Tab 1")
self.tab1UI()
self.setWindowTitle("Main Window")
def tab1UI(self):
self.comboBox = QComboBox(self.tab1)
self.comboBox.addItem('ABC')
self.comboBox.addItem('BCD')
self.comboBox.addItem('CDE')
self.comboBox.move(5,20)
self.comboBox.resize(180,30)
self.button = QPushButton('Add Cmd', self.tab1)
self.button.move(190,20)
self.button.resize(80,30)
self.button.clicked.connect(self.handleTest)
self.b = QTextEdit(self.tab1)
self.b.move(20,75)
self.b.resize(290,200)
self.button = QPushButton('Send Batch', self.tab1)
self.button.move(40,300)
self.button.resize(150,30)
self.button = QPushButton('Clear', self.tab1)
self.button.move(200,300)
self.button.resize(80,30)
self.button.clicked.connect(self.deletevalue)
layout = QFormLayout()
self.setTabText(4,"BatchCMDS")
self.tab1.setLayout(layout)
def handleTest(self):
self.b.append(str(self.comboBox.currentText()))
def deletevalue(self):
self.b.clear()
def main():
app = QApplication(sys.argv)
ex = tabdemo()
ex.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
If you want the widgets to adapt to the size of the window you should use layouts, For this, the application must be designed, for this an image is used of how you want your application to be:
As we see the widgets that are inside a tab are divided into 3 groups, the first is made up of the QComboBox with the QPushButton, the second the QTextEdit, and the third the 2 remaining buttons. Each group is horizontally distributed, so in that case we should use QHBoxLayout except the QTextEdit that is alone, and each group should be in QVBoxLayout. I do not understand why you use the QFormLayout, also if you use the layouts the positions are not necessary.
Another error that I see in your code is that several buttons have the same name, this causes errors like for example that the Add CMD button does not work, you must give a different name to each widget.
class tabdemo(QTabWidget):
def __init__(self, parent = None):
super(tabdemo, self).__init__(parent)
self.setGeometry(50, 50, 400,400)
QShortcut(QKeySequence("Esc"), self, self.close)
self.tab1 = QWidget()
self.tab2 = QWidget()
self.addTab(self.tab1,"Tab 1")
self.addTab(self.tab2,"Tab 2")
self.tab1UI()
def tab1UI(self):
vlayout = QVBoxLayout(self.tab1)
hlayout1 = QHBoxLayout()
self.comboBox = QComboBox(self.tab1)
self.comboBox.addItems(['ABC', 'BCD', 'CDE'])
self.button = QPushButton('Add Cmd', self.tab1)
self.button.clicked.connect(self.handleTest)
hlayout1.addWidget(self.comboBox)
hlayout1.addWidget(self.button)
hlayout1.addItem(QSpacerItem(100, 10, QSizePolicy.Expanding, QSizePolicy.Preferred))
vlayout.addLayout(hlayout1)
self.b = QTextEdit(self.tab1)
vlayout.addWidget(self.b)
hlayout2 = QHBoxLayout()
self.buttonSend = QPushButton('Send Batch', self.tab1)
self.buttonClear = QPushButton('Clear', self.tab1)
self.buttonClear.clicked.connect(self.deletevalue)
hlayout2.addItem(QSpacerItem(100, 10, QSizePolicy.Expanding, QSizePolicy.Preferred))
hlayout2.addWidget(self.buttonSend)
hlayout2.addWidget(self.buttonClear)
hlayout2.addItem(QSpacerItem(100, 10, QSizePolicy.Expanding, QSizePolicy.Preferred))
vlayout.addLayout(hlayout2)
self.setTabText(4,"BatchCMDS")
def handleTest(self):
self.b.append(self.comboBox.currentText())
def deletevalue(self):
self.b.clear()
I want to add widgets in GUI when a user selects a particular item from QComboBox.
With the different options in combo-box Pip config, I want GUI to look like as in the following images. In the right image, there are extra widgets present for an item Multi pip. Also I want the location of the extra widgets as shown in the right image.
How to add these widgets dynamically ? Please find the code below.
import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import Qt, QRect
class Example(QWidget):
def __init__(self):
super(Example, self).__init__()
self.initUI()
def initUI(self):
vbox = QVBoxLayout()
CpsLabel = QLabel()
CpsLabel.setText("<font size = 12>Cps</font>")
CpsLabel.setAlignment(Qt.AlignCenter)
CpsLabel.setTextFormat(Qt.RichText)
CpsPipConfigLabel = QLabel('Pip config: ')
CpsPipConfigComboBox = QComboBox()
CpsPipConfigComboBox.addItems(['Single pip', 'Dual pip', 'Multi pip'])
CpsPipConfigComboBox.setCurrentIndex(2)
CpsChannel = QLabel('Cps channel: ')
CpsChannelComboBox = QComboBox()
CpsChannelComboBox.addItems(['A', 'B', 'C', 'D'])
CpsChannelComboBox.setCurrentIndex(0)
CpsTotalTeethLabel = QLabel('Total teeth: ')
CpsTotalTeethEdit = QLineEdit()
CpsTotalTeethEdit.setFixedWidth(50)
CpsTotalTeethEdit.setPlaceholderText('18')
CpsTotalTeethEdit.setValidator(QIntValidator())
CpsMissingTeethLabel = QLabel('Missing teeth: ')
CpsMissingTeethEdit = QLineEdit()
CpsMissingTeethEdit.setFixedWidth(50)
CpsMissingTeethEdit.setPlaceholderText('1')
CpsMissingTeethEdit.setValidator(QIntValidator())
vbox.addWidget(CpsLabel)
vbox.addStretch()
CpsQHBox1 = QHBoxLayout()
CpsQHBox1.setSpacing(0)
CpsQHBox1.addStretch()
CpsQHBox1.addWidget(CpsPipConfigLabel)
CpsQHBox1.addWidget(CpsPipConfigComboBox)
CpsQHBox1.addStretch()
vbox.addLayout(CpsQHBox1)
vbox.addStretch()
CpsQHBox2 = QHBoxLayout()
CpsQHBox2.setSpacing(0)
CpsQHBox2.addStretch()
CpsQHBox2.addSpacing(20)
CpsQHBox2.addWidget(CpsTotalTeethLabel)
CpsQHBox2.addWidget(CpsTotalTeethEdit)
CpsQHBox2.addStretch()
CpsQHBox2.addWidget(CpsMissingTeethLabel)
CpsQHBox2.addWidget(CpsMissingTeethEdit)
CpsQHBox2.addStretch()
vbox.addLayout(CpsQHBox2)
vbox.addStretch()
CpsQHBox3 = QHBoxLayout()
CpsQHBox3.setSpacing(0)
CpsQHBox3.addStretch()
CpsQHBox3.addWidget(CpsChannel)
CpsQHBox3.addWidget(CpsChannelComboBox)
CpsQHBox3.addStretch()
vbox.addLayout(CpsQHBox3)
vbox.addStretch()
self.setLayout(vbox)
self.setGeometry(200, 100, 300, 300)
self.setWindowTitle('Steady state data processing')
self.setWindowIcon(QIcon('duty_vs_suction_map_sum.png'))
self.setAutoFillBackground(True)
p = self.palette()
p.setColor(self.backgroundRole(), QColor(255,250,100))
# p.setColor(self.backgroundRole(), Qt.blue)
self.setPalette(p)
self.show()
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
I suggest you set the widgets up and place them at the beginning like you have them, but set them invisible. Then make a method that sets the appropriate widgets visible based on the qcombobox's current text and connect it to the qcombobox's activated signal.
You will also need to add self in front of almost every object so that it can be referred to from other methods.
class Example(QWidget):
def __init__(self):
super(Example, self).__init__()
self.initUI()
def initUI(self):
# setup code here...
self.CpsTotalTeethEdit.setVisible(False)
self.CpsTotalTeethLabel.setVisible(False)
self.CpsPipConfigComboBox.activated.connect(self.setup_total_teeth)
self.show()
def setup_widgets(self):
if self.CpsPipConfigComboBox.currentText() == "Multi pip":
self.CpsTotalTeethLabel.setVisible(True)
self.CpsTotalTeethEdit.setVisible(True)
By setting the items invisible instead of adding them with this method, you can also set them to be not visible when the cobobox's position is not for them.
How can I add customized items to a QListWidget with a background color that I choose, and add a bottom border to each item, like this draft example in the picture below.
This is the code that I wrote:
from PyQt5 import QtWidgets, QtGui
import sys
class CustomListHead(QtWidgets.QWidget):
def __init__(self):
super(CustomListHead, self).__init__()
self.project_title = QtWidgets.QLabel("Today")
self.set_ui()
def set_ui(self):
grid_box = QtWidgets.QGridLayout()
grid_box.addWidget(self.project_title, 0, 0)
self.setLayout(grid_box)
self.show()
class CustomListItem(QtWidgets.QWidget):
def __init__(self):
super(CustomListItem, self).__init__()
self.project_title = QtWidgets.QLabel("Learn Python")
self.task_title = QtWidgets.QLabel("Learn more about forms, models and include")
self.set_ui()
def set_ui(self):
grid_box = QtWidgets.QGridLayout()
grid_box.addWidget(self.project_title, 0, 0)
grid_box.addWidget(self.task_title, 1, 0)
self.setLayout(grid_box)
self.show()
class MainWindowUI(QtWidgets.QMainWindow):
def __init__(self):
super(MainWindowUI, self).__init__()
self.list_widget = QtWidgets.QListWidget()
self.set_ui()
def set_ui(self):
custom_head_item = CustomListHead()
item = QtWidgets.QListWidgetItem(self.list_widget)
item.setSizeHint(custom_head_item.sizeHint())
self.list_widget.setItemWidget(item, custom_head_item)
self.list_widget.addItem(item)
custom_item = CustomListItem()
item = QtWidgets.QListWidgetItem(self.list_widget)
item.setSizeHint(custom_item.sizeHint())
self.list_widget.addItem(item)
self.list_widget.setItemWidget(item, custom_item)
vertical_layout = QtWidgets.QVBoxLayout()
vertical_layout.addWidget(self.list_widget)
widget = QtWidgets.QWidget()
widget.setLayout(vertical_layout)
self.setCentralWidget(widget)
self.show()
app = QtWidgets.QApplication(sys.argv)
ui = MainWindowUI()
sys.exit(app.exec_())
I see you have QListWidgetItem with you.
From documentation you can customize each widget item, customize it and add to your listwidget:
The appearance of the text can be customized with setFont(), setForeground(), and setBackground(). Text in list items can be aligned using the setTextAlignment() function. Tooltips, status tips and "What's This?" help can be added to list items with setToolTip(), setStatusTip(), an
d setWhatsThis().
http://doc.qt.io/qt-5/qlistwidgetitem.html#details