I am working on a PyGTK GUI project, and i would like to know, is there any way to get variable value from gtk.Entry?
text=gtk.Entry(0)
text.set_activates_default(True)
port = text.get_text()
This doesn't work as, the text box is empty by default, and get_text() returns empty string, any ideas?
This doesn't work as, the text box is empty by default, and get_text() returns empty string, any ideas?
Sounds like you're looking for getting the text after some user input. In order to do this, gtk uses signals that allow you to connect a user action to some function that will do something. In your case you want this function to get the text from the input. Because you haven't described the user interaction I'll give the simplest example. If you had a button
in your GUI that, when clicked, would grab whatever is typed in the entry at that moment, you'd do this:
button = gtk.Button( 'Click Me')
button.connect( 'clicked', on_button_click )
Then, you define the on_button_click function:
def on_button_click(self, widget, data=None):
port = text.get_text()
print 'Port: %s' % port
So with the sample code above, you'd have a button that, when clicked, grabs the text from your gtk.Entry.
Check out this link for a simple example on how to use signals in pygtk
Since your text field is by default empty, get_text() would return empty string.
Add a button callback function or some other function. So whenever that function is called, you would get the string from the Entry using
text.gtk_text()
You might want to use self here. since you'll be accessing entry in some other function and not in main thread, use
self.text=gtk.Entry()
self.text.set_activates_default(True)
def foo(self,widget,event): # some callback function
port = self.text.get_text()
print port
The retrieving method is the correct one, but right after the creation, the user can't yet have typed anyting into the field.
You would have to wait for the user to actually type something into the field, and afterwards calling get_text().
Related
In the pythonista app for iOS I'm trying to check if a textfield in my ui has any numbers in it when I press on a button. When I use the same code on a string it works. When I use the code for textfield within a button's action it doesn't work. Please help? Here's what my code is like:
import ui
import console
def contains_digits(d):
for char in d:
if char.isdigit():
return True
return False
test='test3'
print(contains_digits(test)) #this works - it prints TRUE!
#below always prints failed even though it should print whatever is in the textfield?!
def button_pushed(sender):
if contains_digits(textfield1):
print(textfield1)
print('failed')
v=ui.load_view()
textfield1 = str(v['textfield1'].text)
v.present('fullscreen')
You’re setting the variable textfield to the field’s text before any text can be entered into the textfield1 TextField.
It will work if you just set textfield1 to v['textfield1'] and then get the .text out of it in your button_pushed function.
def button_pushed(sender):
if contains_digits(textfield1.text):
print(textfield1.text)
return
print('failed')
v=ui.load_view()
textfield1 = v['textfield1']
v.present('fullscreen')
This works because, instead of setting the text to what is in the field at startup, it waits until you have received notification that the field has been changed (assuming that is when button_pushed is called).
However, the best way to do this is to use the sender variable that button_pushed receives. Assuming you’ve set the TextField up so that textfield1.action is the button_pushed function, sender should be the TextField, so that you can do:
def button_pushed(sender):
if contains_digits(sender.text):
print(sender.text)
return
print('failed')
(Note that the way button_pushed is set up in your code, it will always print failed even if it also prints the semi-numeric text. You also need a return after the successful printing.)
I am aware of two ways to set a TextField to call a function (or method) as its action in Pythonista. The easiest is probably to set it within your code.
v=ui.load_view()
textfield1 = v['textfield1']
textfield1.action = button_pushed
v.present('fullscreen')
The other method is to set it within the UI file. When you have the TextField selected in the UI editor, and are looking at the settings for the TextField (as I write this, the “i” button in the upper right brings up the settings), the very bottom setting is “CUSTOM ATTRIBUTES”. Set the custom attributes to:
{'action':button_pushed}
Once you make either of these changes, then whenever the text field has finished editing (for example, by pressing “return” or by moving the focus to another field), that action will be called. Of course, if you do this and it turns out to be the behavior you want, you may wish to change the name of the function from button_pushed to something more descriptive of when or why the function is called.
You may also wish to change the name of the TextField from its default of “textfield1” to something more descriptive of its purpose as well, so as to make your code easier to follow once you have multiple fields to work with.
I am trying to create a series of buttons in a loop. Each button gets an id number as it's text and when the button is clicked it is supposed to send the id number to a function that will open an archived order. At this time I just want to print the order number to prove that the signal works and each button is connected to the correct order number.
ui.cmdOpen = QtWidgets.QPushButton(ui.frOrdHist)
ui.cmdOpen.setGeometry(QtCore.QRect(269, line1Y, 61, 22))
ui.cmdOpen.setText(iOrderId)
ui.cmdOpen.setObjectName("cmdOpen")
ui.cmdOpen.clicked.connect(lambda button=ui.cmdOpen:displayOrder(ui, button))
def displayOrder(ui, button):
i = button.text()
print(i)
When I click the button, I get an error message that says "boolean object has no text attribute"
I tried passing the order number directly and it would print "False" so still a boolean. I don't know where the boolean is coming from, it must be something wrong in the signal.
The clicked signal always sends the checked state of the button. So this will overwrite your default button argument with a boolean value, which is why you get the AttributeError (i.e. because bool doesn't have that method). You should instead make the connection like this:
ui.cmdOpen.clicked.connect(
lambda checked, button=ui.cmdOpen: displayOrder(ui, button))
PS: another common source of this issue is the triggered signal of QAction. If you ever find your slots receiving unexpected inputs, it's always worth checking the Qt Docs to see if the signature of the signal has any parameters with default values - i.e. that look something like this:
void QSomeClass::someSignal(bool param = false)
I use qt designer and convert it from *.ui to *.py, I want to make application for send and receive serial data,,
i use combobox to alow user for setting serial comةunication
self.ui.comboBox_2.addItems(['2400','4800','9600','19200'])
my question is how can i get value from combobo_2 to fill serial buadrate when I click a button
this is my code
self.connect(self.ui.comboBox_2, QtCore.SIGNAL('activated(QString)'),ser.baudRate())
and get an error
File "mainw.py", line 18, in press_2 self.connect(self.ui.comboBox_2,
QtCore.SIGNAL('activated(QString)'),ser.baudRate()) AttributeError:
'Serial' object has no attribute 'baudRate'
Your question about using a button to get the value from the combo box is different than what you are currently doing which is using a signal directly from when an value in the combo box was selected.
Your error is related to something else, it looks like in your signal you are calling a function "ser.baudRate()" but you have to pass in a function object, as it will pass in whatever "ser.buadRate()" returns. Which probably isn't a function. I'm not sure what that function returns. In any case, here is some ideas:
Using a button
If you want to use a button, then you would write something like this:
self.connect(self.ui.myButton, QtCore.SIGNAL('clicked()'), self.updateBaudRate)
def updateBaudRate(self):
# get value from combo box
rate = str(self.ui.comboBox_2.currentText()) # convert to string otherwise you will get a QString which is sometimes not friendly with other tools
ser.baudRate(rate)
Using the combo box signal
self.connect(self.ui.comboBox_2, QtCore.SIGNAL('currentIndexChanged(QString)'), self.updateBaudRate)
def updateBaudRate(self, rate):
ser.baudRate(str(rate)) # again convert to string as it my not accept a QString
You could use partial from the functools module or use a lambda instead of writing a function for the signal, but this is just for example.
You probably also want to use the "currentIndexChanged" signal instead of "activated" as "currentIndexChanged" will only emit when the value has changed, otherwise it will signal even if the user didn't select a different value in the combo box.
I have just now begun with GUI programming in Python 2.7 with Tkinter.
I want to have a button Browse, which when clicked opens the Windows File Explorer and returns the path of file selected to a variable. I wish to use that path later.
I am following the code given here. It outputs a window displaying 5 buttons, but the buttons do nothing. On clicking the first button, it doesn't open the selected file.
Likewise, on clicking the second button, the askopenfilename(self) function is called and it should return a filename. Like I mentioned, I need that filename later.
How to I get the value returned by the function into some variable for future use?
There is no point in using return inside a callback to a button. It won't return to anywhere. The way to make a callback save data is to store it in a global variable, or an instance variable if you use classes.
def fetchpath():
global filename
filename = tkFileDialog.askopenfilename(initialdir = 'E:')
FWIW (and unrelated to the question): you're making a very common mistake. In python, when you do foo=bar().baz(), foo takes the value in baz(). Thus, when you do this:
button = Button(...).pack()
button will take the value of pack() which always returns None. You should separate widget creation from widget layout if you expect to save an actual reference to the widget being created. Even if you're not, it's a good practice to separate the two.
So I'm trying to create a dialog box that asks the user for an input (a number) with python's built-in Tkinter library. In particular, I googled that this could be easily achieved with the method simpledialog.askinteger.
In a normal tkinter.button, I have the argument "command" which allows me to call a method. This is how I first made this part of my code within the main window:
self.generate_game_button = tkinter.Button(self.main_window, text='Start!', \
command=self.create_grid)
But as I want to ask for this number in a pop up window, in tkinter.simpledialog.askinteger, there is no argument for command, so I'm left with no way of calling my create_grid method... The code looks like:
def press_newgame(self):
global a
a = tkinter.simpledialog.askinteger('Inputz', 'Enter the gameboard size')
My create_grid method basically makes a set of buttons using the inputted int... How can I achieve this using a pop up window to ask the user for a number, and then call the create grid method similar to how the tkinter.Button works?
I hope this makes sense... Thanks.
Well, this is working differently than a simple button, because askinteger is a dialog window, which is not there constantly, it has to be called, and then it will automatically return you a value -- as you expect it.
So I guess you want to do something with the given a value (you probably want to pass it to the create_grid method, so all you have to do is call the method after you got the integer value, something like this:
def press_newgame(self):
a = tkinter.simpledialog.askinteger('Inputz', 'Enter the gameboard size')
self.create_grid(a)
I'm not sure a perfectly understand your usecase. If i understand well, you have a "New game" button, and after the user pressed that button, you want to show the askinteger dialog to get the size of the grid you have to generate for the player. In this case, why you just call your your grid-creating function simply after you came back from the dialog, so like:
global a
a = tkinter.simpledialog.askinteger('Inputz', 'Enter the gameboard size')
createGrid(size=a) # or whatever your function is