[ ]All1 [ ]All2
[ ]checkbox1A [ ]checkbox1B
[ ]checkbox2A [ ]checkbox2B
Based on the chart above, a few things need to happen:
The All checkboxes only affect the on/off of the column it resides in, and checks on/off all the checkboxes in that column.
All checkboxes work in pairs, so if checkbox1A is on/off, checkbox1B needs to be on/off
If an All checkbox is checked on, and then the user proceeds to check off one or more checkbox in the column, the All checkbox should be unchecked, but all the checkboxes that are already checked should remain checked.
So really this is more like a chain reaction setup. If checkbox All1 is on, then chieckbox1A and 2A will be on, and because they are on, checkbox1B and 2B are also on, but checkbox All2 remains off. I tried hooking up the signals based on this logic, but only the paired logic works 100%. The All checkbox logic only works 50% of the time, and not accurately, and there's no way for me to turn off the All checkbox without turning all already checked checkboxes off.
Really really need help ... T-T
Sample code:
cbPairKeys = cbPairs.keys()
for key in cbPairKeys:
cbOne = cbPairs[key][0][0]
cbTwo = cbPairs[key][1][0]
cbOne.stateChanged.connect(self.syncCB)
cbTwo.stateChanged.connect(self.syncCB)
def syncCB(self):
pairKeys = cbPairs.keys()
for keys in pairKeys:
cbOne = cbPairs[keys][0][0]
cbOneAllCB = cbPairs[keys][0][4]
cbTwo = cbPairs[keys][1][0]
cbTwoAllCB = cbPairs[keys][1][4]
if self.sender() == cbOne:
if cbOne.isChecked() or cbTwoAllCB.isChecked():
cbTwo.setChecked(True)
else:
cbTwo.setChecked(False)
else:
if cbTwo.isChecked() or cbOneAllCB.isChecked():
cbOne.setChecked(True)
else:
cbOne.setChecked(False)
EDIT
Thanks to user Avaris's help and patience, I was able to reduce the code down to something much cleaner and works 100% of the time on the 1st and 2nd desired behavior:
#Connect checkbox pairs
cbPairKeys = cbPairs.keys()
for key in cbPairKeys:
cbOne = cbPairs[key][0][0]
cbTwo = cbPairs[key][1][0]
cbOne.toggled.connect(cbTwo.setChecked)
cbTwo.toggled.connect(cbOne.setChecked)
#Connect allCB and allRO signals
cbsKeys = allCBList.keys()
for keys in cbsKeys:
for checkbox in allCBList[keys]:
keys.toggled.connect(checkbox.setChecked)
Only need help on turning off the All checkbox when the user selectively turns off the modular checkboxes now
If I'm understanding your data structure, I have a solution. Correct me if I'm wrong: allCBList is a dict (confusing name! :) ). Its keys are the all* checkboxes. And a value allCBList[key] is a list with checkboxes associated with that all checkbox. For your example structure it'll be something like this:
{ All1 : [checkbox1A, checkbox1B],
All2 : [checkbox2A, checkbox2B]}
Then what you need to is this: when a checkbox is toggled and it is in checked state, then you need to check the All* checkbox if all the other checkboxes are in checked state. Otherwise it will be unchecked.
for key, checkboxes in allCBList.iteritems():
for checkbox in checkboxes:
checkbox.toggled.connect(lambda checked, checkboxes=checkboxes, key=key: key.setChecked(checked and all(checkbox.isChecked() for checkbox in checkboxes))
I guess, this statement requires a bit of explanation:
lambda checked, checkboxes=checkboxes, key=key:
lambda creates the callable that is connected to the signal. toggled passes checkbox status, and it will be passed to checked variable. checkboxes=checkboxes and key=key parts pass the current values to checkboxes and key parameters of the lambda. (You need this because of the closure in lambdas)
Next comes:
key.setChecked(...)
We are setting the checked state of key which is the appropriate All* checkbox. And inside this:
checked and all(checkbox.isChecked() for checkbox in checkboxes)
all is True if everything inside is True, where we check every checkboxs state. And this will return True if all are checked (i.e. isChecked() returns True).
checked and ... part is there to short-circuit the all. If the current checkbox turns unchecked, then we don't need to check others. All* would be unchecked.
(PS: By the way, you don't need to get .keys() of a dict to iterate over keys. You can just iterate over the dict and it will iterate over its keys.)
Edit: Just to avoid chain reaction with All* checkboxes toggled by clicking any sub-checkboxes, it's necessary to change the signal for All* checkboxes to clicked, instead of toggled. So, the All* check boxes will affect other below them only in the case of user interaction.
In the end, your modified code will be:
# Connect checkbox pairs
# you just use the values
# change 'itervalues' to 'values' if you are on Python 3.x
for cbPair in cbPairs.itervalues():
cbOne = cbPair[0][0]
cbTwo = cbPair[1][0]
cbOne.toggled.connect(cbTwo.setChecked)
cbTwo.toggled.connect(cbOne.setChecked)
# Connect allCB and allRO signals
# change 'iteritems' to 'items' if you are on Python 3.x
for key, checkboxes in allCBList.iteritems():
for checkbox in checkboxes:
key.clicked.connect(checkbox.setChecked)
checkbox.toggled.connect(lambda checked, checkboxes=checkboxes, key=key: key.setChecked(checked and all(checkbox.isChecked() for checkbox in checkboxes))
Your problem is that your checkboxes are connecting the toggled signal and toggling their state in your connected slots so the signal is emitted again (so the slots are executed again...) and you get unpredictable results. Obviously that is not your wanted behavior. You can fix it in several ways:
by disconnecting the signals at the beginning of the slots and connecting them again at the end
by using some clever code that controls the re-emission of signals (I think this is what Avari's code does in a very compact way, but I'm not completely sure)
by using a clicked signal because it is not re-emitted when the checkbox state changes
Which approach you follow is up to you. The following code uses the third approach:
self.cbPair = {}
self.cbPair['0'] = (QtGui.QCheckBox('all1', parent),
QtGui.QCheckBox('all2', parent))
self.cbPair['1'] = (QtGui.QCheckBox('1a', parent),
QtGui.QCheckBox('1b', parent))
self.cbPair['2'] = (QtGui.QCheckBox('2a', parent),
QtGui.QCheckBox('2b', parent))
for v in self.cbPair.values():
for cb in v:
cb.clicked.connect(self.updateCB)
def updateCB(self):
cb = self.sender()
is_checked = cb.isChecked()
id = str(cb.text())
try:
# Update a whole column
column = int(id[-1]) - 1
rows = ('1', '2')
except ValueError:
# Update a row and the headers row
rows = (id[0], )
column = {'a': 1, 'b': 0}.get(id[-1])
if not is_checked:
for c in (0, 1):
self.cbPair['0'][c].setChecked(is_checked)
for r in rows:
self.cbPair[r][column].setChecked(is_checked)
Note that I'm using the checkboxes text as a UID from wich row and colum values are calculated. If you want to use different text labels for your checkboxes you may need to set the UIDs as attributes to every checkbox.
Related
I am trying to delete objects from a list by choosing them via streamlits multiselect widget, having the list entries as entries of the widget. Thus, the list also decides what options are in the multiselect box.
However, after the app reruns—once I deleted some options—I get the error: streamlit.errors.StreamlitAPIException: Every Multiselect default value must exist in options
Here is some minimal code example.
import streamline as st
if st.button("Refill") or "options" not in st.session_state:
st.session_state.options=["a","b","c"]
def submit():
for item in st.session_state.selected:
st.session_state.options.remove(item)
form=st.form("My form")
form.multiselect("Select", st.session_state.options, key="selected")
form.form_submit_button("Submit", on_click=submit)
I tried to add the line
st.session_state.selected=[]
to the submit function so that the multiselect-box is cleared and does not reference deleted items, but it did not solve the issue.
Thanks for any help in advance! :)
Add the following to the top of your code:
if "selected" in st.session_state:
del st.session_state.selected
Explanation:
The streamlit multi-select widget maintains the last selection in its internal state (st.session_state.selected in your case), so if you delete an item from your st.session_state.options list, it will error out, as it can't find the current selection in the list you passed to it.
To fix this, simply delete the session_state.selected prior to running the rest of the code; this is done with the suggested if-Statement.
You might also want to add the kwarg clear_on_submit=True on your st.form definition, as that clears the input of the form as well.
I am dynamically adding QToolButtons to my toolbar that inherits from QToolBar. I have a list of tuples (widget, callback) that contain what should be added to the toolbar. In theory, I want to group them by the requesting object and separate the groups with addSeparator().
My dictionary of widgets are comprised of three widget tuples, two owned by the same key. Currently, all of my widgets are QToolButtons.
I have tried the following two 'adding' functions with descriptions of results to follow:
# self.registered_widgets is an OrderedDict:
# key: requesting object string, value: ((widget, callback), ...)
def add_registered_widgets_to_toolbar(self):
print "add_registered_widgets_to_toolbar"
#import pdb;pdb.set_trace()
#self.reg... is an OrderedDict
for key in self.registered_widgets.keys():
widgetList = self.registered_widgets[key]
print key
for widgetTuple in widgetList:
print widgetTuple[0]
print widgetTuple[0].parent()
self.addWidget(widgetTuple[0])
self.addSeparator()
This set up results in the first widget never being shown. Ever. I have printed their addresses, parents, and associated keys to confirm that they are as I expect:
three separate widgets
associated with correct key
have my QToolBar class object as parent widget
and are all being processed in the order I expect
All of those conditions are true to no effect.
The second attempt:
def add_registered_widgets_to_toolbar(self):
print "add_registered_widgets_to_toolbar"
#import pdb;pdb.set_trace()
l = self.layout()
for key in self.registered_widgets.keys():
widgetList = self.registered_widgets[key]
print key
for widgetTuple in widgetList:
print widgetTuple[0]
print widgetTuple[0].parent()
l.addWidget(widgetTuple[0]
l.addSeperator()
self.setLayout(l)
This results in all the QToolButton icons overlapping, with the last being the full width of a modal dialog's button. (All of the buttons are created with a set QSize of (24,24).)
Additionally, unlike with the first version of the function, the toolbar never shows properly. Just maybe (I'm guessing) the top four to five pixels are shown between the widget above my toolbar and the widget below. Just enough to make out the tops of my three, very different icons and the width of the last when I hover over it.
I've consulted with those more knowledgeable in the ways of Python than myself and nobody has any ideas, even after running and debugging the program while it runs. I'm at a complete loss.
I have a QListWidget that has 10 QListWidgetItems. When each of those QListWidgetItems is created I do something like this:
item = QtGui.QListWidgetItem("Text to Show")
item.setData(36, "A specific value that is used later")
self.ui.my_list.addItem(item)
Now, later in the application, after a user clicks a button, I want to update the text "A specific value that is used later", for the item that is selected. I have attempted to do this
ndx = self.ui.my_list.currentRow()
self.ui.my_list.item(ndx).setData(36, "Updated!")
The problem is, this doesn't work. It doesn't throw any errors, but the data is just gone. In my button press signal I have this code to see the value before and after the reassignment:
ndx = self.ui.my_list.currentRow()
print "Before:", self.ui.my_list.item(ndx).data(36).toPyObject()
self.ui.my_list.item(ndx).setData(36, "Updated!")
print "After:", self.ui.my_list.item(ndx).data(36).toPyObject()
This outputs:
Before: A specific value that is used later
After:
How can I properly change the data so that it is saved back to the QListWidgetItem?
You may want to check that the role value your using is a valid user role, otherwise it may be altered internally. I write in c++, but I use the QListWidget and QListWidgetItem(s) frequently, and this was a problem I encountered early on. I imagen that the functionality is similar regardless of the language. According to the documentation here, the first user role that can be used is 0x0010. So to tie it to your example, you might try the following:
item.setData(0x0010, "A specific value that is used later")
For additional item roles you would use 0x0011, 0x0012, 0x0013, etc.
I need to check multiple radio buttons from a qt ui with python.
Up to now we are using something similar to:
if main.ui.radioButton_1.isChecked():
responses["q1"] = "1"
elif main.ui.radioButton_2.isChecked():
responses["q1"] = "2"
elif main.ui.radioButton_3.isChecked():
responses["q1"] = "3"
if main.ui.radioButton_4.isChecked():
responses["q2"] = "1"
elif main.ui.radioButton_5.isChecked():
responses["q2"] = "2"
elif main.ui.radioButton_6.isChecked():
responses["q2"] = "3"
...
Since there are very many buttons and many different categories (q1, q2, ...) I was thinking of optimizing it a bit. So this is what I hoped would work (adopted from How to get the checked radiobutton from a groupbox in pyqt):
for i, button in enumerate(["main.ui.radioButton_" + str(1) for i in range(1, 8)]):
if button.isChecked():
responses["q1"] = str(i - 1)
I get why this doesn't work but writing it I hoped it would.
So I tried to iterate through the buttons using something similar to (Is there a way to loop through and execute all of the functions in a Python class?):
for idx, name, val in enumerate(main.ui.__dict__.iteritems()):
and then use some modulo 3 and such to assign the results. But that doesn't work either. Not sure if it's because i used __ dict __ or something else. The error I got was:
TypeError: 'QLabel' object is not iterable
Now some people could say that implicit is better that explicit and also because of readability the if elif chain is good the way it is but there are 400+ lines of that. Also after reading this post, Most efficient way of making an if-elif-elif-else statement when the else is done the most?, I thought there must be a better and more efficient way of doing this (see examples 3.py and 4.py of the of the accepted answer). Because I need to check the Boolean value of main.ui.radioButton_1.isChecked() and then assign thevalue according to the Buttons group (q1, q2,...), I haven't managed to implement the solution using dictionaries as described in the post.
Am I stuck with the if elif chain or is there a way to not only reduce the LOC but also make the code more efficient (faster)?
It looks like you have used Qt Designer to create your ui, so I would suggest putting each set of radio buttons in a QButtonGroup. This will give you a simple, ready-made API for getting the checked button in a group without having to query each button individually.
In Qt Designer, buttons can be added to a button-group by selecting them, and then choosing Assign to button group > New button group from the context menu. The button IDs (which you will need to use later) are assigned in the order the buttons are selected. So use Ctrl+Click to select each button of a group in the correct order. The IDs start at 1 for each group and just increase by one for each button that is added to that group.
When a new button-group is added, it will appear in the Object Inspector. This will allow you to select it and give it a more meaningful name.
Once you've created all the groups, you can get the checked button of a group like this:
responses["q1"] = str(main.ui.groupQ1.checkedId())
responses["q2"] = str(main.ui.groupQ2.checkedId())
# etc...
This could be simplified even further to process all the groups in a loop:
for index in range(1, 10):
key = 'q%d' % index
group = 'groupQ%d' % index
responses[key] = str(getattr(main.ui, group).checkedId())
Another way to do it is using signals. If you had lots of radio button in an application, I suspect this kind of approach would be noticeably faster. For example:
import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class MoodExample(QGroupBox):
def __init__(self):
super(MoodExample, self).__init__()
# Create an array of radio buttons
moods = [QRadioButton("Happy"), QRadioButton("Sad"), QRadioButton("Angry")]
# Set a radio button to be checked by default
moods[0].setChecked(True)
# Radio buttons usually are in a vertical layout
button_layout = QVBoxLayout()
# Create a button group for radio buttons
self.mood_button_group = QButtonGroup()
for i in xrange(len(moods)):
# Add each radio button to the button layout
button_layout.addWidget(moods[i])
# Add each radio button to the button group & give it an ID of i
self.mood_button_group.addButton(moods[i], i)
# Connect each radio button to a method to run when it's clicked
self.connect(moods[i], SIGNAL("clicked()"), self.radio_button_clicked)
# Set the layout of the group box to the button layout
self.setLayout(button_layout)
#Print out the ID & text of the checked radio button
def radio_button_clicked(self):
print(self.mood_button_group.checkedId())
print(self.mood_button_group.checkedButton().text())
app = QApplication(sys.argv)
mood_example = MoodExample()
mood_example.show()
sys.exit(app.exec_())
I found more information at:
http://codeprogress.com/python/libraries/pyqt/showPyQTExample.php?index=387&key=QButtonGroupClick
http://www.pythonschool.net/pyqt/radio-button-widget/
I have a listbox in Tkinter and I would like to change the item selected programatically when the user presses a key button. I have the keyPressed method but how do I change the selection in the Listbox in my key pressed method?
Because listboxes allow for single vs. continuous vs. distinct selection, and also allow for an active element, this question is ambiguous. The docs explain all the different things you can do.
The selection_set method adds an item to the current selection. This may or may not unselect other items, depending on your selection mode.
If you want to guarantee that you always get just that one item selected no matter what, you can clear the selection with selection_clear(0, END), then selection_set that one item.
If you want to also make the selected item active, also call activate on the item after setting it.
To understand about different selection modes, and how active and selected interact, read the docs.
If you need ListboxSelect event to be also triggered, use below code:
# create
self.lst = tk.Listbox(container)
# place
self.lst.pack()
# set event handler
self.lst_emails.bind('<<ListboxSelect>>', self.on_lst_select)
# select first item
self.lst.selection_set(0)
# trigger event manually
self.on_lst_select()
# event handler
def on_lst_select(self, e = None):
# Note here that Tkinter passes an event object to handler
if len(self.lst.curselection()) == 0:
return
index = int(self.lst.curselection()[0])
value = self.lst.get(index)
print (f'new item selected: {(index, value)}')