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Editing: textview.py
"""Simple text browser for IDLE """ from tkinter import Toplevel, Text, TclError,\ HORIZONTAL, VERTICAL, N, S, E, W from tkinter.ttk import Frame, Scrollbar, Button from tkinter.messagebox import showerror from idlelib.colorizer import color_config class AutoHiddenScrollbar(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 TextFrame(Frame): "Display text with scrollbar." def __init__(self, parent, rawtext, wrap='word'): """Create a frame for Textview. parent - parent widget for this frame rawtext - text to display """ super().__init__(parent) self['relief'] = 'sunken' self['height'] = 700 self.text = text = Text(self, wrap=wrap, highlightthickness=0) color_config(text) text.grid(row=0, column=0, sticky=N+S+E+W) self.grid_rowconfigure(0, weight=1) self.grid_columnconfigure(0, weight=1) text.insert(0.0, rawtext) text['state'] = 'disabled' text.focus_set() # vertical scrollbar self.yscroll = yscroll = AutoHiddenScrollbar(self, orient=VERTICAL, takefocus=False, command=text.yview) text['yscrollcommand'] = yscroll.set yscroll.grid(row=0, column=1, sticky=N+S) if wrap == 'none': # horizontal scrollbar self.xscroll = xscroll = AutoHiddenScrollbar(self, orient=HORIZONTAL, takefocus=False, command=text.xview) text['xscrollcommand'] = xscroll.set xscroll.grid(row=1, column=0, sticky=E+W) class ViewFrame(Frame): "Display TextFrame and Close button." def __init__(self, parent, text, wrap='word'): super().__init__(parent) self.parent = parent self.bind('<Return>', self.ok) self.bind('<Escape>', self.ok) self.textframe = TextFrame(self, text, wrap=wrap) self.button_ok = button_ok = Button( self, text='Close', command=self.ok, takefocus=False) self.textframe.pack(side='top', expand=True, fill='both') 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, text, 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 text - 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.viewframe = ViewFrame(self, text, wrap=wrap) self.protocol("WM_DELETE_WINDOW", self.ok) self.button_ok = button_ok = Button(self, text='Close', command=self.ok, takefocus=False) 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, text, 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 text - 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, text, 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, 'r', 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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