python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/idlelib/textview.py

@@ -0,0 +1,175 @@
+"""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)