Python IDLE 清屏及行号显示功能实现
实现清屏与行号显示功能需要新建两个.py文件（ClearWindow.py与LineNumbers.py）,并向相应.py文件中写入代码！
清屏（ClearWindow.py）
文本编辑，写入如下代码，进行保存。
"""
Clear Window Extension
Version: 0.1
Author: Roger D. Serwy
roger.serwy@gmail.com
Date: 2009-05-22
It provides "Clear Shell Window" under "Options"
Add these lines to config-extensions.def
[ClearWindow]
enable=1
enable_editor=0
enable_shell=1
[ClearWindow_cfgBindings]
clear-window=<Control-Key-l>
"""
class ClearWindow:
menudefs = [
('options', [None,
('Clear Shell Window', '<<clear-window>>'),
]),]
def __init__(self, editwin):
self.editwin = editwin
self.text = self.editwin.text
self.text.bind("<<clear-window>>", self.clear_window)
def clear_window2(self, event): # Alternative method
# work around the ModifiedUndoDelegator
text = self.text
text.mark_set("iomark2", "iomark")
text.mark_set("iomark", 1.0)
text.delete(1.0, "iomark2 linestart")
text.mark_set("iomark", "iomark2")
text.mark_unset("iomark2")
if self.text.compare('insert', '<', 'iomark'):
self.text.mark_set('insert', 'end-1c')
self.editwin.set_line_and_column()
def clear_window(self, event):
# remove undo delegator
undo = self.editwin.undo
self.editwin.per.removefilter(undo)
# clear the window, but preserve current command
self.text.delete(1.0, "iomark linestart")
if self.text.compare('insert', '<', 'iomark'):
self.text.mark_set('insert', 'end-1c')
self.editwin.set_line_and_column()
# restore undo delegator
self.editwin.per.insertfilter(undo)
行号显示（LineNumbers.py）
文本编辑，写入如下代码，进行保存。
# IDLEX EXTENSION
## """
## Copyright(C) 2011 The Board of Trustees of the University of Illinois.
## All rights reserved.
##
## Developed by: Roger D. Serwy
## University of Illinois
##
## Permission is hereby granted, free of charge, to any person obtaining
## a copy of this software and associated documentation files (the
## "Software"), to deal with the Software without restriction, including
## without limitation the rights to use, copy, modify, merge, publish,
## distribute, sublicense, and/or sell copies of the Software, and to
## permit persons to whom the Software is furnished to do so, subject to
## the following conditions:
##
## + Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimers.
## + Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimers in the
## documentation and/or other materials provided with the distribution.
## + Neither the names of Roger D. Serwy, the University of Illinois, nor
## the names of its contributors may be used to endorse or promote
## products derived from this Software without specific prior written
## permission.
##
## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
## OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
## MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
## IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR
## ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
## CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
## THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE SOFTWARE.
##
##
##
## LineNumbers Extension
##
## Provides line numbers to the left of the source code.
##
## The width of the line numbers adapts. Limit of 99,999 lines (for proper display).
##
## """
config_extension_def = """
[LineNumbers]
enable=1
enable_shell=0
visible=True
[LineNumbers_cfgBindings]
linenumbers-show=
"""
import sys
if sys.version < '3':
from Tkinter import END, Text, LEFT, Y, NONE, RIGHT, NORMAL, DISABLED, Label, TOP, Frame, X
else:
from tkinter import END, Text, LEFT, Y, NONE, RIGHT, NORMAL, DISABLED, Label, TOP, Frame, X
from idlelib.configHandler import idleConf
from idlelib.Delegator import Delegator
from idlelib.Percolator import Percolator
FONTUPDATEINTERVAL = 1000 # milliseconds
_AFTER_UNDO = True # Flag to have the LineNumberDelegator inserted after the undo delegator
jn = lambda x,y: '%i.%i' % (x,y) # join integers to text coordinates
sp = lambda x: map(int, x.split('.')) # convert tkinter Text coordinate to a line and column tuple
def dbprint(func): # A decorator for debugging
def f(*args, **kwargs):
print(func, args, kwargs)
return func(*args, **kwargs)
return f
class LineNumbers(object):
menudefs = [('options', [('!Show Line Numbers', '<<linenumbers-show>>')])]
def __init__(self, editwin):
self.editwin = editwin
self.text = self.editwin.text
self.textfont = None
self.width = 2
self.after_id = None
self.create_linenumbers()
e = idleConf.GetOption("extensions", "LineNumbers",
"visible", type="bool", default=True)
self.set_visible(e)
self.code_context_fix()
def close(self):
if self.after_id:
self.text.after_cancel(self.after_id)
self.visible = False
def adjust_font(self):
try:
# taken from CodeContext.py
newtextfont = self.editwin.text["font"]
if self.textln and newtextfont != self.textfont:
self.textfont = newtextfont
self.textln["font"] = self.textfont
if self._cc_text:
self._cc_text["font"] = self.textfont
self.update_numbers()
except Exception as err:
import traceback; traceback.print_exc()
def font_timer(self):
if not self.visible:
return
self.adjust_font()
if self.after_id:
self.text.after_cancel(self.after_id)
self.after_id = self.text.after(FONTUPDATEINTERVAL, self.font_timer)
if not _AFTER_UNDO:
self.update_numbers() # fixes a bug due to this percolator being ahead of undo percolator.
def set_visible(self, b=True):
self.visible = b
if self.visible:
self.text.after(1, self.font_timer) # avoid a start-up bug
self.show()
# use .after to avoid a start-up error caused by update_idletasks in update_numbers
self.text.after(1, self.update_numbers)
else:
self.hide()
idleConf.SetOption("extensions", "LineNumbers",
"visible", '%s' % self.visible)
self.editwin.setvar("<<linenumbers-show>>", self.visible)
def linenumbers_show_event(self, ev=None):
self.set_visible(not self.visible)
self._code_context_toggle()
def create_linenumbers(self):
""" Create the widget for displaying line numbers. """
editwin = self.editwin
text = self.text
text_frame = editwin.text_frame
self.textln = textln = Text(text_frame, width=self.width,
height=1, wrap=NONE)
# adjust font
textln.config(font=(idleConf.GetOption('main', 'EditorWindow', 'font'),
idleConf.GetOption('main', 'EditorWindow', 'font-size')))
textln.bind("<FocusIn>", self.focus_in_event)
textln.bind('<Button-1>', self.button_ignore)
textln.bind('<Button-2>', self.button_ignore)
textln.bind('<Button-3>', self.button_ignore)
textln.bind('<B1-Motion>', self.button_ignore)
textln.bind('<B2-Motion>', self.button_ignore)
textln.bind('<B3-Motion>', self.button_ignore)
textln.bind("<Button-4>", self.button4)
textln.bind("<Button-5>", self.button5)
textln.tag_config('LINE', justify=RIGHT)
textln.insert(END, '1')
textln.tag_add('LINE', '1.0', END)
# start the line numbers
self.per = per = Percolator(textln)
self.line_delegator = LineDelegator()
per.insertfilter(self.line_delegator)
textln._insert = self.line_delegator.delegate.insert
textln._delete = self.line_delegator.delegate.delete
lines = LineNumberDelegator(self)
if _AFTER_UNDO:
# Percolator.py's .insertfilter should have an "after=" argument
lines.setdelegate(editwin.undo.delegate)
editwin.undo.setdelegate(lines)
else:
editwin.per.insertfilter(lines)
editwin.vbar['command'] = self.vbar_split
editwin.text['yscrollcommand'] = self.yscroll_split
def button4(self, ev=None):
self.text.event_generate("<Button-4>")
return "break"
def button5(self, ev=None):
self.text.event_generate("<Button-5>")
return "break"
def button_ignore(self, ev=None):
return "break"
def show(self):
self.textln.pack(side=LEFT, fill=Y, before=self.editwin.text)
def hide(self):
self.textln.pack_forget()
def focus_in_event(self, event=None):
self.editwin.text.focus_set()
self.textln.tag_remove('sel', '1.0', 'end')
#self.editwin.text.event_generate("<<goto-line>>")
def generate_goto_event(self, event=None):
self.editwin.text.event_generate("<<goto-line>>")
return "break"
def vbar_split(self, *args, **kwargs):
""" split scrollbar commands to the editor text widget and the line number widget """
self.textln.yview(*args, **kwargs)
self.text.yview(*args, **kwargs)
def yscroll_split(self, *args, **kwargs):
""" send yview commands to both the scroll bar and line number listing """
#import traceback; traceback.print_stack()
self.editwin.vbar.set(*args)
self.textln.yview_moveto(args[0])
def update_numbers(self, add=None, remove=None):
if not self.visible: return
textln = self.textln
text = self.editwin.text
endline1, col1 = sp(text.index(END))
endline2, col2 = sp(textln.index(END))
if endline1 < endline2:
# delete numbers
textln._delete('%i.0' % endline1, END)
elif endline1 > endline2:
# add numbers
q = range(endline2, endline1)
r = map(lambda x: '%i' % x, q)
s = '\n' + '\n'.join(r)
textln._insert(END, s)
textln.tag_add('LINE', '1.0', END)
# adjust width of textln, if needed. (counts from 1, not zero)
if endline1 <= 100:
width = 2
elif endline1 <= 1000:
width = 3
elif endline1 <= 10000:
width = 4
else:
width = 5 # more than 9999 lines in IDLE? Really?
# XXX: If your code requires width>5, i.e > 100,000 lines of code,
# you probably should not be using IDLE.
if width > self.width: # 2011-12-18 - only grow, not shrink
self.width = width
textln.configure(width=width)
if self._cc_text: # adjust CC width
self._cc_text.configure(width=width)
self.textln.update_idletasks()
a = self.text.yview()
self.textln.yview_moveto(a[0])
def code_context_fix(self):
self._cc_text = None
self._cc_frame = None
def f():
self.text.bind('<<toggle-code-context>>', self._code_context_toggle, '+')
self._code_context_toggle()
self.text.after(10, f)
def _code_context_toggle(self, event=None):
cc = self.editwin.extensions.get('CodeContext', None)
if cc is None:
return
if not self.visible:
if self._cc_frame:
L = cc.label
L.pack_forget()
self._cc_frame.destroy()
L.pack(side=TOP, fill=X, expand=False,
before=self.editwin.text_frame)
return
editwin = self.editwin
text = self.text
text_frame = editwin.text_frame
# repack the Label in a frame
if cc.label:
cc.label.pack_forget()
F = Frame(self.editwin.top)
F.lower() # fix Z-order
t = Text(F, width=self.width, height=1,
takefocus=0)
t.bind("<FocusIn>", lambda x: self.text.focus())
t["font"] = self.textln.cget('font')
t.pack(side=LEFT, fill=Y)
cc.label.pack(in_=F, fill=X, expand=False)
F.pack(side=TOP, before=text_frame, fill=X, expand=False)
self._cc_frame = F
self._cc_text = t
else:
if self._cc_frame:
self._cc_frame.destroy()
self._cc_frame = None
self._cc_text = None
class LineNumberDelegator(Delegator):
# for editwin.text
def __init__(self, line_number_instance):
Delegator.__init__(self)
self.ext = line_number_instance
def insert(self, index, chars, tags=None):
self.delegate.insert(index, chars, tags)
if '\n' in chars:
self.ext.update_numbers()#add=chars.count('\n'))
def delete(self, index1, index2=None):
t = self.get(index1, index2)
self.delegate.delete(index1, index2)
if '\n' in t:
self.ext.update_numbers()#remove=t.count('\n'))
class LineDelegator(Delegator):
# for textln
def insert(self, *args, **kargs):
pass
def delete(self, *args, **kargs):
pass接下来把这两个文件放在python安装目录的D:\python3.7.0\Lib\idlelib文件夹下
查找idlelib目录下的config-extensions.def文件，用文本编辑器打开，在结尾增加代码（如下），保存。
[ClearWindow]
enable=1
enable_editor=0
enable_shell=1
[ClearWindow_cfgBindings]
clear-window=<Control-Key-l>
[LineNumbers]
enable=1
enable_editor=1
enable_shell=0
visible=1
打开IDLE，配置成功！
