Unsolved Displaying real-time data on a 2nd window
-
@john_hobbyist said in Displaying real-time data on a 2nd window:
change the text in QLineEdit when "ct" variable has different value. "ct" variable is in my code...
You ask about a piece of code which has no "
ct
variable" used in it. How do you think anybody can answer this? -
@JonB said in Displaying real-time data on a 2nd window:
@john_hobbyist said in Displaying real-time data on a 2nd window:
change the text in QLineEdit when "ct" variable has different value. "ct" variable is in my code...
You ask about a piece of code which has no "
ct
variable" used in it. How do you think anybody can answer this?Please look at my code above. I have posted the code and where "ct" is used...
-
ct = pandas.read_csv('CurrentTown.csv')
We don't know what
pandas.read_csv()
returns. I would guess some kind of table? So I don't know what you expect to put in aQLineEdit
for its "value".Anyway, if you have
qle.textChanged[str].connect(self.onChanged)
that meansself.onChanged()
will be called whenqle
's text changes. Ifqle
is theQLineEdit
you are talking aboutchange the text in QLineEdit when "ct" variable has different value.
then that connection is not relevant. If this is what you want, then "when "ct" variable has different value" however that happens just call
qle.setText(str(ct))
or whatever you want. Else you mean something different. -
@JonB said in Displaying real-time data on a 2nd window:
ct = pandas.read_csv('CurrentTown.csv')
We don't know what
pandas.read_csv()
returns. I would guess some kind of table? So I don't know what you expect to put in aQLineEdit
for its "value".Anyway, if you have
qle.textChanged[str].connect(self.onChanged)
that meansself.onChanged()
will be called whenqle
's text changes. Ifqle
is theQLineEdit
you are talking aboutchange the text in QLineEdit when "ct" variable has different value.
then that connection is not relevant. If this is what you want, then "when "ct" variable has different value" however that happens just call
qle.setText(str(ct))
or whatever you want. Else you mean something different.ct = pandas.read_csv('CurrentTown.csv')
holds the name of one town each time I read the .csv. nothing else. It is use in order to pass the name of the town from another class/method and that's it. When I move the cursor of the mouse to another town the .csv stores the other new town (from the other class/method) and I read it with the "ct". I only need to update the town name on the QLineEdit field...
-
Everytime I move the mouse pointer (on the map) to different places, the second window should update the values and show new data, which does not happen.
Show the code you use to connect the mouse move signal or event in the first window to the slot in the second window.
If you say everything works when you output the town name on the terminal (
print()
maybe?), and now want to display it on aQTextEdit
instead, then as I already said all you have to do is call the line edit'ssetText()
. -
class Town(QWidget): def __init__(self): super().__init__() self.initUI() def initUI(self): import sys from PyQt5.QtWidgets import QWidget,QPushButton,QApplication,QListWidget,QGridLayout,QLabel from PyQt5.QtCore import QTimer,QDateTime from PyQt5 import QtWidgets from PyQt5.QtWidgets import QApplication, QMainWindow from PyQt5 import QtCore win = QWidget() grid=QGridLayout() import pandas ct = pandas.read_csv('CurrentTown.csv') town = QLabel("town:") town.setStyleSheet("border: 1px solid black; background-color: yellow") grid.addWidget(town, 1,1) textEdit_1 = QLineEdit(ct) textEdit_1.textChanged[str].connect(self.onChanged) textEdit_1.setReadOnly(True) grid.addWidget(textEdit_1,1,2) import os os.remove('CurrentTown.csv') self.setLayout(grid) win.setGeometry(100,100,200,100) win.setWindowTitle("Test") win.show() def onChanged(self, text): self.textEdit_1.setText(str(ct))
Any ideas??
-
@john_hobbyist said in Displaying real-time data on a 2nd window:
textEdit_1.textChanged[str].connect(self.onChanged)
I already said. You think you want to connect
QLineEdit.textChanged
signal to do something. That is when something changes the text. But you don't have anything changing the text. You need a signal for when the file content changes to connect to a slot to change the text in the line edit.You claimed you had it working printing on terminal fine, but I don't see that.
Conceptually the code you have to read the file must be in a method called when the text in the file is changed. You have all this code in the constructor of the
Town
widget, which cannot be right.There is no connection at all between your
textEdit_1 = QLineEdit(ct)
and theself.textEdit_1.setText(str(ct))
you use later. Please review local versus member variables in Python.You don't want to have any
self.textEdit_1
in classTown
as the line edit you want to address is not on theTown
widget, it is on thewin
widget.Start by creating a separate Python module and class for your second window. Put the code to read the file and set the line edit text there. Then in this
Town
module create an instance of that class and show it. InTown
you will have some connection like:self.signalForFileDataChanged.connect(self.otherWindow.onFileDataChanged)
where the second window's
onFileDataChanged()
reads the new text from the file and sets its line edit.When you have that working you may see that you could have the
Town.signalForFileDataChanged()
signal send a parameter of the new town name to theOtherWindow.onFileDataChanged()
slot for it to show. Then you can ditch having them communicate via the content of an external file. -
I have another method that I want to call from another class. I have this code:
class Two(CentralWindow): def do_something(self, checked): . . .
I want to call the do_something method from initUI(self) ??
I have tried google search solutions, but they show to call a method outside a class/method. I need to call the do_something method from inside initUI(self) method.... -
@john_hobbyist
Fundamental Python. Nothing special aboutinitUI(self)
.- From within
class Two
:self.do_something(checked)
. - From outside
class Two
:class_two_instance.do_something(checked)
.
- From within
-
This post is deleted! -
In order to start from somewhere, after your very useful comments I did a change in the code so that when the ct changes to call the method def onChanged(self, text) which prints "OK". However, this happens only the first time that ct changes value. All the next times it does not print "OK"...What do I miss here???
-
I may sound harsh but: proper architecture.
I would suggest to start with something really minimal to just learn to use signals and slots properly, how to manage multiple different complex widgets that are only linked together by signals and slots.
-
I am trying! How can I call a method before declaring it?
-
You just don't.
As I already suggested: start with Qt's basics.
- Single widget with signals and slots within it.
- Second widget completely unrelated to the first one
- Connect them only after they both properly work independently
- While doing that: write unit tests
-
@SGaist Thank you, I will try it.
Please tell me a reason that the code runs commands such as open/make a widget + QLinedit + QLabels (I checked it with print commands) but I see only the widget (window) and nothing inside... What is wrong?
-
@john_hobbyist said in Displaying real-time data on a 2nd window:
What is wrong?
Please show the code, else only guessing is possible!
Did you add these widgets to your container widget (main window or whatever)? -
I am trying to embed a grid layout to the right side of the mainwidget. Imagine that I have divided the mainwidget area into 2 areas, left and side. I get this error though:
File "code.py", line 1643, in __init__ mylayout.addWidget(self.imageviewer, 1, 1) TypeError: addWidget(self, QWidget, stretch: int = 0, alignment: Union[Qt.Alignment, Qt.AlignmentFlag] = Qt.Alignment()): argument 3 has unexpected type 'int'
What did I do wrong?
-
Are you sure mylayout is a QGridLayout ?
-
I have it like this:
mylayout = QHBoxLayout()
-
So since it's a QHBoxLayout, why are you trying to use it like a grid layout ?
The error message tells you exactly the problem you have. If you read the method documentation, you'll see that the second parameter shall be a value from the Alignment enum.