I have a Tkinter GUI that is composed of two widgets, the first is a widget class with an entry field and a button and the second is a scrollable text widget class. I have combined these two widget classes to make a single GUI. Each of these widget classes works correctly as individuals.
The text field of the GUI is being used to display the contents of a specific index of a list.I want to be able to enter an index number in the entry field and upon pressing the button the text in the text field is re-configured to show the contents of the list for the specified index. The indivdual widgets communicate properly with one another, by which I mean the value of the index entered into the entry field is properly recognized by the update_text method. However when I press the button I get the following error message:
Exception in Tkinter callback
Traceback (most recent call last):
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1470, in __call__
return self.func(*args)
File "/Users/BioASys/BioasysDB/simpletestgui.py", line 56, in fetch_update_text
self.parent.update_text(article_index)
File "/Users/BioASys/BioasysDB/simpletestgui.py", line 112, in update_text
self.top_right.configure(text=text_list[index])
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1262, in configure
return self._configure('configure', cnf, kw)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1253, in _configure
self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
TclError: unknown option "-text"
When I initialize (mainloop) the GUI I have the text widget set to display the 0 index of the list.
I have written simplified code that exhibits my problem. My original code is too complex to sensibly
post here. Because of the layout of all the individual widgets in my original code it was necessary
to combine multiple widget classes to achieve my desired widget layout.
The problem I am experiencing is caused by the code which rewrites the text within the existing top_right text widget.
This code is: "self.top_right.configure(text=text_list[index])"
which is contained in the update_text method of the article_review_widget_assembled class.
I thought that performing a text.configure for the text in the text field would perform the desired text rewrite and
if that didn't work then I could use text.delete and text.insert methods to delete all the text and then insert the desired text,
allowing me to successfully rewrite the text. Unfortunately neither of these methods works.
If anybody knows how to change the text within the existing top_right text widget I would appreciate the assistance.
Here is my complete code:
# This list contains the sample text that is to be placed in the individual text widgets, referenced by index
text_list = [['text0AAAAAAA'], ['text1AAAAAAA'], ['text2AAAAAAA']]
# This class creates the widget that will be designated top_left in the article_review_widget_assembled widget
class article_review_entry_button_widget(Frame):
def __init__(self, parent=None):
self.parent = parent
Frame.__init__(self, parent)
self.pack(expand=YES, fill=BOTH) # make me expandable
self.index = 2
self.makeWidgets()
def handleList(self, event):
index = self.listbox.curselection()
label = self.listbox.get(index)
self.runCommand(label)
def fetch(self): # This def gets the value placed in the entry field
print 'Input => "%s"' % self.ent.get()
article_index = self.ent.get()
######
def fetch_update_text(self): # This def gets the value placed in the entry field and also accesses the update_text def to update the text in the top_right widget
print 'Input => "%s"' % self.ent.get()
article_index = int(self.ent.get())
self.parent.update_text(article_index)
def makeWidgets(self):
self.ent = Entry(self)
btn = Button(self, text='Next Article', command=self.fetch_update_text)
self.ent.insert(0, 0)
self.ent.pack(side=TOP, fill=BOTH)
self.ent.focus()
self.ent.bind('<Return>', (lambda event: self.fetch()))
value = self.ent.get()
btn.pack(side=TOP)
class ScrolledText(Frame): # This class creates a text widget that can be scrolled, I use this as the basis for the other text widgets in this GUI
def __init__(self, parent=None, text='', file=None, width='', height=''):
Frame.__init__(self, parent)
self.pack(expand=YES, fill=BOTH) # make me expandable
self.width = width
self.height = height
self.makewidgets()
self.settext(text, file)
def makewidgets(self):
sbar = Scrollbar(self)
text = Text(self, relief=SUNKEN, width=self.width, height=self.height)
sbar.config(command=text.yview) # xlink sbar and text
text.config(yscrollcommand=sbar.set) # move one moves other
sbar.pack(side=RIGHT, fill=Y) # pack first=clip last
text.pack(side=LEFT, expand=YES, fill=BOTH) # text clipped first
self.text = text
def settext(self, text='', file=None):
self.text.delete('1.0', END) # delete current text
self.text.insert('1.0', text) # add at line 1, col 0
self.text.mark_set(INSERT, '1.0') # set insert cursor
self.text.focus() # save user a click
def gettext(self): # returns a string
return self.text.get('1.0', END+'-1c') # first through last
class article_review_widget_assembled(Frame): # This class uses the previous classes to create the final assemnbeld GUI widget
def __init__(self, parent=None):
Frame.__init__(self, parent)
self.pack(expand=YES, fill=BOTH) # make me expandable
self.text = text_list[0]
self.makeWidgets()
###### This is the def that is called by the fetch_update_text def in the article_review_entry_button_widget class
# and contains the line that is causing the error
def update_text(self,index):
print "The index is:", index
self.top_right.configure(text=text_list[index]) # configure text but causes error
#self.top_right.text.delete('1.0',END) # delete current text but causes error
#self.top_right.insert('1.0',text_list[index]) # add at line 1, col 0 but causes error
#self.top_right = ScrolledText(self, text= text_list[index], width=50, height=15).pack(side=LEFT) # re packs the top_right widget
def makeWidgets(self):
self.top_left = article_review_entry_button_widget(self).pack(side=LEFT)
#self.top_right = ScrolledText(self, text= self.text, width=50, height=15).pack(side=LEFT)
self.top_right = ScrolledText(self, text= self.text, width=50, height=15)
self.top_right.pack(side=LEFT)
if __name__ == '__main__':
#article_review_entry_button_widget().mainloop()
#ScrolledTextComposite().mainloop()