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"""Simple text browser for IDLE

"""

from tkinter import Toplevel, Text, TclError,\

HORIZONTAL, VERTICAL, NS, EW, NSEW, NONE, WORD, SUNKEN

from tkinter.ttk import Frame, Scrollbar, Button

from tkinter.messagebox import showerror

from idlelib.colorizer import color_config

class AutoHideScrollbar(Scrollbar):

"""A scrollbar that is automatically hidden when not needed.

Only the grid geometry manager is supported.

"""

def set(self, lo, hi):

if float(lo) > 0.0 or float(hi) < 1.0:

self.grid()

else:

self.grid_remove()

super().set(lo, hi)

def pack(self, **kwargs):

raise TclError(f'{self.__class__.__name__} does not support "pack"')

def place(self, **kwargs):

raise TclError(f'{self.__class__.__name__} does not support "place"')

class ScrollableTextFrame(Frame):

"""Display text with scrollbar(s)."""

def __init__(self, master, wrap=NONE, **kwargs):

"""Create a frame for Textview.

master - master widget for this frame

wrap - type of text wrapping to use ('word', 'char' or 'none')

All parameters except for 'wrap' are passed to Frame.__init__().

The Text widget is accessible via the 'text' attribute.

Note: Changing the wrapping mode of the text widget after

instantiation is not supported.

"""

super().__init__(master, **kwargs)

text = self.text = Text(self, wrap=wrap)

text.grid(row=0, column=0, sticky=NSEW)

self.grid_rowconfigure(0, weight=1)

self.grid_columnconfigure(0, weight=1)

# vertical scrollbar

self.yscroll = AutoHideScrollbar(self, orient=VERTICAL,

takefocus=False,

command=text.yview)

self.yscroll.grid(row=0, column=1, sticky=NS)

text['yscrollcommand'] = self.yscroll.set

# horizontal scrollbar - only when wrap is set to NONE

if wrap == NONE:

self.xscroll = AutoHideScrollbar(self, orient=HORIZONTAL,

takefocus=False,

command=text.xview)

self.xscroll.grid(row=1, column=0, sticky=EW)

text['xscrollcommand'] = self.xscroll.set

else:

self.xscroll = None

class ViewFrame(Frame):

"Display TextFrame and Close button."

def __init__(self, parent, contents, wrap='word'):

"""Create a frame for viewing text with a "Close" button.

parent - parent widget for this frame

contents - text to display

wrap - type of text wrapping to use ('word', 'char' or 'none')

The Text widget is accessible via the 'text' attribute.

"""

super().__init__(parent)

self.parent = parent

self.bind('<Return>', self.ok)

self.bind('<Escape>', self.ok)

self.textframe = ScrollableTextFrame(self, relief=SUNKEN, height=700)

text = self.text = self.textframe.text

text.insert('1.0', contents)

text.configure(wrap=wrap, highlightthickness=0, state='disabled')

color_config(text)

text.focus_set()

self.button_ok = Button(

self, text='Close', command=self.ok, takefocus=False)

self.textframe.pack(side='top', expand=True, fill='both')

self.button_ok.pack(side='bottom')

def ok(self, event=None):

"""Dismiss text viewer dialog."""

self.parent.destroy()

class ViewWindow(Toplevel):

"A simple text viewer dialog for IDLE."

def __init__(self, parent, title, contents, modal=True, wrap=WORD,

*, _htest=False, _utest=False):

"""Show the given text in a scrollable window with a 'close' button.

If modal is left True, users cannot interact with other windows

until the textview window is closed.

parent - parent of this dialog

title - string which is title of popup dialog

contents - text to display in dialog

wrap - type of text wrapping to use ('word', 'char' or 'none')

_htest - bool; change box location when running htest.

_utest - bool; don't wait_window when running unittest.

"""

super().__init__(parent)

self['borderwidth'] = 5

# Place dialog below parent if running htest.

x = parent.winfo_rootx() + 10

y = parent.winfo_rooty() + (10 if not _htest else 100)

self.geometry(f'=750x500+{x}+{y}')

self.title(title)

self.protocol("WM_DELETE_WINDOW", self.ok)

self.viewframe = ViewFrame(self, contents, wrap=wrap)

self.viewframe.pack(side='top', expand=True, fill='both')

self.is_modal = modal

if self.is_modal:

self.transient(parent)

self.grab_set()

if not _utest:

self.wait_window()

def ok(self, event=None):

"""Dismiss text viewer dialog."""

if self.is_modal:

self.grab_release()

self.destroy()

def view_text(parent, title, contents, modal=True, wrap='word', _utest=False):

"""Create text viewer for given text.

parent - parent of this dialog

title - string which is the title of popup dialog

contents - text to display in this dialog

wrap - type of text wrapping to use ('word', 'char' or 'none')

modal - controls if users can interact with other windows while this

dialog is displayed

_utest - bool; controls wait_window on unittest

"""

return ViewWindow(parent, title, contents, modal, wrap=wrap, _utest=_utest)

def view_file(parent, title, filename, encoding, modal=True, wrap='word',

_utest=False):

"""Create text viewer for text in filename.

Return error message if file cannot be read. Otherwise calls view_text

with contents of the file.

"""

try:

with open(filename, encoding=encoding) as file:

contents = file.read()

except OSError:

showerror(title='File Load Error',

message=f'Unable to load file {filename!r} .',

parent=parent)

except UnicodeDecodeError as err:

showerror(title='Unicode Decode Error',

message=str(err),

parent=parent)

else:

return view_text(parent, title, contents, modal, wrap=wrap,

_utest=_utest)

return None

if __name__ == '__main__':

from unittest import main

main('idlelib.idle_test.test_textview', verbosity=2, exit=False)

from idlelib.idle_test.htest import run

run(ViewWindow)

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