The Text widget resize to its contents. Based on this: https://stackoverflow.com/questions/11544187/tkinter-resize-text-to-contents
But here there is one important improvement: The widget resize first, before a character inclusion.
For this trick I have had to use tag bindings.
Here there is a practical application of this widget:
https://code.activestate.com/recipes/578885-draggable-desktop-note-or-sticky-notes-in-tkinter/
Python, 152 lines
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# Author: Miguel Martinez Lopez
# Uncomment the next line to see my email
# print "Author's email: ", "61706c69636163696f6e616d656469646140676d61696c2e636f6d".decode("hex")
try:
from Tkinter import Frame, Text
from Tkconstants import *
import tkFont
except ImportError:
from tkinter import Frame, Text
from tkinter.constants import *
from tkinter import font as tkFont
class AutoResizedText(Frame):
def __init__(self, master, width=0, height=0, family=None, size=None,*args, **kwargs):
Frame.__init__(self, master, width = width, height= height)
self.pack_propagate(False)
self._min_width = width
self._min_height = height
self._textarea = Text(self, *args, **kwargs)
self._textarea.pack(expand=True, fill='both')
if family != None and size != None:
self._font = tkFont.Font(family=family,size=size)
else:
self._font = tkFont.Font(family=self._textarea.cget("font"))
self._textarea.config(font=self._font)
# I want to insert a tag just in front of the class tag
# It's not necesseary to guive to this tag extra priority including it at the beginning
# For this reason I am making this search
self._autoresize_text_tag = "autoresize_text_"+str(id(self))
list_of_bind_tags = list(self._textarea.bindtags())
list_of_bind_tags.insert(list_of_bind_tags.index('Text'), self._autoresize_text_tag)
self._textarea.bindtags(tuple(list_of_bind_tags))
self._textarea.bind_class(self._autoresize_text_tag, "<KeyPress>",self._on_keypress)
def _on_keypress(self, event):
self._textarea.focus_set()
if event.keysym == 'BackSpace':
self._textarea.delete("%s-1c" % INSERT)
new_text = self._textarea.get("1.0", END)
elif event.keysym == 'Delete':
self._textarea.delete("%s" % INSERT)
new_text = self._textarea.get("1.0", END)
# We check whether it is a punctuation or normal key
elif len(event.char) == 1:
if event.keysym == 'Return':
# In this situation ord(event.char)=13, which is the CARRIAGE RETURN character
# We want instead the new line character with ASCII code 10
new_char = '\n'
else:
new_char = event.char
old_text = self._textarea.get("1.0", END)
new_text = self._insert_character_into_message(old_text, self._textarea.index(INSERT), new_char)
else:
# If it is a special key, we continue the binding chain
return
# Tk Text widget always adds a newline at the end of a line
# This last character is also important for the Text coordinate system
new_text = new_text[:-1]
self._fit_to_size_of_text(new_text)
# Finally we insert the new character
if event.keysym != 'BackSpace' and event.keysym != 'Delete':
self._textarea.insert(INSERT, new_char)
return "break"
def _insert_character_into_message(self, message, coordinate, char):
target_row, target_column = map( int, coordinate.split('.'))
this_row = 1
this_column = 0
index = 0
for ch in message:
if this_row == target_row and this_column == target_column:
message = message[:index] + char + message[index:]
return message
index += 1
if ch == '\n':
this_row += 1
this_column = 0
else:
this_column += 1
def _fit_to_size_of_text(self, text):
number_of_lines = 0
widget_width = 0
for line in text.split("\n"):
widget_width = max(widget_width,self._font.measure(line))
number_of_lines += 1
# We need to add this extra space to calculate the correct width
widget_width += 2*self._textarea['bd'] + 2*self._textarea['padx'] + self._textarea['insertwidth']
if widget_width < self._min_width:
widget_width = self._min_width
self._textarea.configure(height=number_of_lines)
widget_height = max(self._textarea.winfo_reqheight(), self._min_height)
self.config(width=widget_width, height=widget_height)
# If we don't call update_idletasks, the window won't be resized before an insertion
self.update_idletasks()
@property
def tag(self):
return self._autoresize_text_tag
def focus(self):
self._textarea.focus()
def bind(self, event, handler, add=None):
self._textarea.bind(event, handler, add)
def get(self, start, end=None):
return self._textarea.get(start, end)
def update(self, text):
self._textarea.delete('1.0', 'end')
self._fit_to_size_of_text(text)
self._textarea.insert('1.0', text)
if __name__ == '__main__':
try:
from Tkinter import Tk
except ImportError:
from tkinter import Tk
root = Tk()
auto_text = AutoResizedText(root, family="Arial",size=15, width = 100, height = 50)
auto_text.pack()
auto_text.focus()
root.mainloop()
|
Nice, Thank you.