mirror of https://github.com/python/cpython
544 lines
20 KiB
Python
544 lines
20 KiB
Python
"""Line numbering implementation for IDLE as an extension.
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Includes BaseSideBar which can be extended for other sidebar based extensions
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"""
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import contextlib
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import functools
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import itertools
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import tkinter as tk
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from tkinter.font import Font
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from idlelib.config import idleConf
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from idlelib.delegator import Delegator
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from idlelib import macosx
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def get_lineno(text, index):
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"""Return the line number of an index in a Tk text widget."""
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text_index = text.index(index)
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return int(float(text_index)) if text_index else None
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def get_end_linenumber(text):
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"""Return the number of the last line in a Tk text widget."""
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return get_lineno(text, 'end-1c')
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def get_displaylines(text, index):
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"""Display height, in lines, of a logical line in a Tk text widget."""
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return text.count(f"{index} linestart",
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f"{index} lineend",
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"displaylines")
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def get_widget_padding(widget):
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"""Get the total padding of a Tk widget, including its border."""
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# TODO: use also in codecontext.py
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manager = widget.winfo_manager()
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if manager == 'pack':
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info = widget.pack_info()
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elif manager == 'grid':
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info = widget.grid_info()
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else:
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raise ValueError(f"Unsupported geometry manager: {manager}")
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# All values are passed through getint(), since some
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# values may be pixel objects, which can't simply be added to ints.
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padx = sum(map(widget.tk.getint, [
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info['padx'],
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widget.cget('padx'),
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widget.cget('border'),
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]))
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pady = sum(map(widget.tk.getint, [
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info['pady'],
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widget.cget('pady'),
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widget.cget('border'),
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]))
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return padx, pady
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@contextlib.contextmanager
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def temp_enable_text_widget(text):
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text.configure(state=tk.NORMAL)
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try:
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yield
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finally:
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text.configure(state=tk.DISABLED)
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class BaseSideBar:
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"""A base class for sidebars using Text."""
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def __init__(self, editwin):
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self.editwin = editwin
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self.parent = editwin.text_frame
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self.text = editwin.text
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self.is_shown = False
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self.main_widget = self.init_widgets()
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self.bind_events()
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self.update_font()
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self.update_colors()
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def init_widgets(self):
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"""Initialize the sidebar's widgets, returning the main widget."""
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raise NotImplementedError
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def update_font(self):
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"""Update the sidebar text font, usually after config changes."""
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raise NotImplementedError
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def update_colors(self):
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"""Update the sidebar text colors, usually after config changes."""
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raise NotImplementedError
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def grid(self):
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"""Layout the widget, always using grid layout."""
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raise NotImplementedError
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def show_sidebar(self):
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if not self.is_shown:
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self.grid()
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self.is_shown = True
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def hide_sidebar(self):
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if self.is_shown:
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self.main_widget.grid_forget()
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self.is_shown = False
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def yscroll_event(self, *args, **kwargs):
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"""Hook for vertical scrolling for sub-classes to override."""
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raise NotImplementedError
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def redirect_yscroll_event(self, *args, **kwargs):
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"""Redirect vertical scrolling to the main editor text widget.
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The scroll bar is also updated.
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"""
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self.editwin.vbar.set(*args)
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return self.yscroll_event(*args, **kwargs)
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def redirect_focusin_event(self, event):
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"""Redirect focus-in events to the main editor text widget."""
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self.text.focus_set()
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return 'break'
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def redirect_mousebutton_event(self, event, event_name):
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"""Redirect mouse button events to the main editor text widget."""
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self.text.focus_set()
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self.text.event_generate(event_name, x=0, y=event.y)
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return 'break'
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def redirect_mousewheel_event(self, event):
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"""Redirect mouse wheel events to the editwin text widget."""
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self.text.event_generate('<MouseWheel>',
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x=0, y=event.y, delta=event.delta)
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return 'break'
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def bind_events(self):
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self.text['yscrollcommand'] = self.redirect_yscroll_event
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# Ensure focus is always redirected to the main editor text widget.
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self.main_widget.bind('<FocusIn>', self.redirect_focusin_event)
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# Redirect mouse scrolling to the main editor text widget.
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#
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# Note that without this, scrolling with the mouse only scrolls
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# the line numbers.
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self.main_widget.bind('<MouseWheel>', self.redirect_mousewheel_event)
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# Redirect mouse button events to the main editor text widget,
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# except for the left mouse button (1).
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#
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# Note: X-11 sends Button-4 and Button-5 events for the scroll wheel.
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def bind_mouse_event(event_name, target_event_name):
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handler = functools.partial(self.redirect_mousebutton_event,
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event_name=target_event_name)
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self.main_widget.bind(event_name, handler)
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for button in [2, 3, 4, 5]:
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for event_name in (f'<Button-{button}>',
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f'<ButtonRelease-{button}>',
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f'<B{button}-Motion>',
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):
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bind_mouse_event(event_name, target_event_name=event_name)
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# Convert double- and triple-click events to normal click events,
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# since event_generate() doesn't allow generating such events.
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for event_name in (f'<Double-Button-{button}>',
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f'<Triple-Button-{button}>',
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):
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bind_mouse_event(event_name,
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target_event_name=f'<Button-{button}>')
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# start_line is set upon <Button-1> to allow selecting a range of rows
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# by dragging. It is cleared upon <ButtonRelease-1>.
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start_line = None
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# last_y is initially set upon <B1-Leave> and is continuously updated
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# upon <B1-Motion>, until <B1-Enter> or the mouse button is released.
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# It is used in text_auto_scroll(), which is called repeatedly and
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# does have a mouse event available.
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last_y = None
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# auto_scrolling_after_id is set whenever text_auto_scroll is
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# scheduled via .after(). It is used to stop the auto-scrolling
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# upon <B1-Enter>, as well as to avoid scheduling the function several
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# times in parallel.
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auto_scrolling_after_id = None
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def drag_update_selection_and_insert_mark(y_coord):
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"""Helper function for drag and selection event handlers."""
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lineno = get_lineno(self.text, f"@0,{y_coord}")
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a, b = sorted([start_line, lineno])
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self.text.tag_remove("sel", "1.0", "end")
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self.text.tag_add("sel", f"{a}.0", f"{b+1}.0")
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self.text.mark_set("insert",
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f"{lineno if lineno == a else lineno + 1}.0")
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def b1_mousedown_handler(event):
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nonlocal start_line
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nonlocal last_y
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start_line = int(float(self.text.index(f"@0,{event.y}")))
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last_y = event.y
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drag_update_selection_and_insert_mark(event.y)
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self.main_widget.bind('<Button-1>', b1_mousedown_handler)
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def b1_mouseup_handler(event):
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# On mouse up, we're no longer dragging. Set the shared persistent
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# variables to None to represent this.
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nonlocal start_line
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nonlocal last_y
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start_line = None
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last_y = None
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self.text.event_generate('<ButtonRelease-1>', x=0, y=event.y)
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self.main_widget.bind('<ButtonRelease-1>', b1_mouseup_handler)
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def b1_drag_handler(event):
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nonlocal last_y
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if last_y is None: # i.e. if not currently dragging
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return
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last_y = event.y
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drag_update_selection_and_insert_mark(event.y)
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self.main_widget.bind('<B1-Motion>', b1_drag_handler)
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def text_auto_scroll():
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"""Mimic Text auto-scrolling when dragging outside of it."""
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# See: https://github.com/tcltk/tk/blob/064ff9941b4b80b85916a8afe86a6c21fd388b54/library/text.tcl#L670
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nonlocal auto_scrolling_after_id
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y = last_y
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if y is None:
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self.main_widget.after_cancel(auto_scrolling_after_id)
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auto_scrolling_after_id = None
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return
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elif y < 0:
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self.text.yview_scroll(-1 + y, 'pixels')
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drag_update_selection_and_insert_mark(y)
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elif y > self.main_widget.winfo_height():
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self.text.yview_scroll(1 + y - self.main_widget.winfo_height(),
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'pixels')
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drag_update_selection_and_insert_mark(y)
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auto_scrolling_after_id = \
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self.main_widget.after(50, text_auto_scroll)
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def b1_leave_handler(event):
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# Schedule the initial call to text_auto_scroll(), if not already
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# scheduled.
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nonlocal auto_scrolling_after_id
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if auto_scrolling_after_id is None:
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nonlocal last_y
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last_y = event.y
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auto_scrolling_after_id = \
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self.main_widget.after(0, text_auto_scroll)
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self.main_widget.bind('<B1-Leave>', b1_leave_handler)
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def b1_enter_handler(event):
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# Cancel the scheduling of text_auto_scroll(), if it exists.
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nonlocal auto_scrolling_after_id
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if auto_scrolling_after_id is not None:
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self.main_widget.after_cancel(auto_scrolling_after_id)
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auto_scrolling_after_id = None
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self.main_widget.bind('<B1-Enter>', b1_enter_handler)
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class EndLineDelegator(Delegator):
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"""Generate callbacks with the current end line number.
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The provided callback is called after every insert and delete.
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"""
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def __init__(self, changed_callback):
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Delegator.__init__(self)
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self.changed_callback = changed_callback
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def insert(self, index, chars, tags=None):
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self.delegate.insert(index, chars, tags)
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self.changed_callback(get_end_linenumber(self.delegate))
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def delete(self, index1, index2=None):
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self.delegate.delete(index1, index2)
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self.changed_callback(get_end_linenumber(self.delegate))
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class LineNumbers(BaseSideBar):
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"""Line numbers support for editor windows."""
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def __init__(self, editwin):
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super().__init__(editwin)
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end_line_delegator = EndLineDelegator(self.update_sidebar_text)
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# Insert the delegator after the undo delegator, so that line numbers
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# are properly updated after undo and redo actions.
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self.editwin.per.insertfilterafter(end_line_delegator,
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after=self.editwin.undo)
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def init_widgets(self):
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_padx, pady = get_widget_padding(self.text)
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self.sidebar_text = tk.Text(self.parent, width=1, wrap=tk.NONE,
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padx=2, pady=pady,
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borderwidth=0, highlightthickness=0)
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self.sidebar_text.config(state=tk.DISABLED)
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self.prev_end = 1
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self._sidebar_width_type = type(self.sidebar_text['width'])
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with temp_enable_text_widget(self.sidebar_text):
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self.sidebar_text.insert('insert', '1', 'linenumber')
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self.sidebar_text.config(takefocus=False, exportselection=False)
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self.sidebar_text.tag_config('linenumber', justify=tk.RIGHT)
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end = get_end_linenumber(self.text)
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self.update_sidebar_text(end)
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return self.sidebar_text
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def grid(self):
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self.sidebar_text.grid(row=1, column=0, sticky=tk.NSEW)
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def update_font(self):
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font = idleConf.GetFont(self.text, 'main', 'EditorWindow')
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self.sidebar_text['font'] = font
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def update_colors(self):
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"""Update the sidebar text colors, usually after config changes."""
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colors = idleConf.GetHighlight(idleConf.CurrentTheme(), 'linenumber')
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foreground = colors['foreground']
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background = colors['background']
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self.sidebar_text.config(
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fg=foreground, bg=background,
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selectforeground=foreground, selectbackground=background,
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inactiveselectbackground=background,
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)
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def update_sidebar_text(self, end):
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"""
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Perform the following action:
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Each line sidebar_text contains the linenumber for that line
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Synchronize with editwin.text so that both sidebar_text and
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editwin.text contain the same number of lines"""
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if end == self.prev_end:
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return
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width_difference = len(str(end)) - len(str(self.prev_end))
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if width_difference:
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cur_width = int(float(self.sidebar_text['width']))
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new_width = cur_width + width_difference
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self.sidebar_text['width'] = self._sidebar_width_type(new_width)
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with temp_enable_text_widget(self.sidebar_text):
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if end > self.prev_end:
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new_text = '\n'.join(itertools.chain(
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[''],
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map(str, range(self.prev_end + 1, end + 1)),
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))
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self.sidebar_text.insert(f'end -1c', new_text, 'linenumber')
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else:
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self.sidebar_text.delete(f'{end+1}.0 -1c', 'end -1c')
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self.prev_end = end
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def yscroll_event(self, *args, **kwargs):
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self.sidebar_text.yview_moveto(args[0])
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return 'break'
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class WrappedLineHeightChangeDelegator(Delegator):
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def __init__(self, callback):
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"""
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callback - Callable, will be called when an insert, delete or replace
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action on the text widget may require updating the shell
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sidebar.
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"""
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Delegator.__init__(self)
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self.callback = callback
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def insert(self, index, chars, tags=None):
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is_single_line = '\n' not in chars
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if is_single_line:
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before_displaylines = get_displaylines(self, index)
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self.delegate.insert(index, chars, tags)
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if is_single_line:
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after_displaylines = get_displaylines(self, index)
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if after_displaylines == before_displaylines:
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return # no need to update the sidebar
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self.callback()
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def delete(self, index1, index2=None):
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if index2 is None:
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index2 = index1 + "+1c"
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is_single_line = get_lineno(self, index1) == get_lineno(self, index2)
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if is_single_line:
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before_displaylines = get_displaylines(self, index1)
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self.delegate.delete(index1, index2)
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if is_single_line:
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after_displaylines = get_displaylines(self, index1)
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if after_displaylines == before_displaylines:
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return # no need to update the sidebar
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self.callback()
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class ShellSidebar(BaseSideBar):
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"""Sidebar for the PyShell window, for prompts etc."""
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def __init__(self, editwin):
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self.canvas = None
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self.line_prompts = {}
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super().__init__(editwin)
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change_delegator = \
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WrappedLineHeightChangeDelegator(self.change_callback)
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# Insert the TextChangeDelegator after the last delegator, so that
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# the sidebar reflects final changes to the text widget contents.
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d = self.editwin.per.top
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if d.delegate is not self.text:
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while d.delegate is not self.editwin.per.bottom:
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d = d.delegate
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self.editwin.per.insertfilterafter(change_delegator, after=d)
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self.is_shown = True
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def init_widgets(self):
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self.canvas = tk.Canvas(self.parent, width=30,
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borderwidth=0, highlightthickness=0,
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takefocus=False)
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self.update_sidebar()
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self.grid()
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return self.canvas
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def bind_events(self):
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super().bind_events()
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self.main_widget.bind(
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# AquaTk defines <2> as the right button, not <3>.
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"<Button-2>" if macosx.isAquaTk() else "<Button-3>",
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self.context_menu_event,
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)
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def context_menu_event(self, event):
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rmenu = tk.Menu(self.main_widget, tearoff=0)
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has_selection = bool(self.text.tag_nextrange('sel', '1.0'))
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def mkcmd(eventname):
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return lambda: self.text.event_generate(eventname)
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rmenu.add_command(label='Copy',
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command=mkcmd('<<copy>>'),
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state='normal' if has_selection else 'disabled')
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rmenu.add_command(label='Copy with prompts',
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command=mkcmd('<<copy-with-prompts>>'),
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state='normal' if has_selection else 'disabled')
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rmenu.tk_popup(event.x_root, event.y_root)
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return "break"
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def grid(self):
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self.canvas.grid(row=1, column=0, sticky=tk.NSEW, padx=2, pady=0)
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def change_callback(self):
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if self.is_shown:
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self.update_sidebar()
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def update_sidebar(self):
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text = self.text
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text_tagnames = text.tag_names
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canvas = self.canvas
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line_prompts = self.line_prompts = {}
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canvas.delete(tk.ALL)
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index = text.index("@0,0")
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if index.split('.', 1)[1] != '0':
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index = text.index(f'{index}+1line linestart')
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while (lineinfo := text.dlineinfo(index)) is not None:
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y = lineinfo[1]
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prev_newline_tagnames = text_tagnames(f"{index} linestart -1c")
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prompt = (
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'>>>' if "console" in prev_newline_tagnames else
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'...' if "stdin" in prev_newline_tagnames else
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None
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)
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if prompt:
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canvas.create_text(2, y, anchor=tk.NW, text=prompt,
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font=self.font, fill=self.colors[0])
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lineno = get_lineno(text, index)
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line_prompts[lineno] = prompt
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index = text.index(f'{index}+1line')
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def yscroll_event(self, *args, **kwargs):
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"""Redirect vertical scrolling to the main editor text widget.
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The scroll bar is also updated.
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"""
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self.change_callback()
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return 'break'
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def update_font(self):
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"""Update the sidebar text font, usually after config changes."""
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font = idleConf.GetFont(self.text, 'main', 'EditorWindow')
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tk_font = Font(self.text, font=font)
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char_width = max(tk_font.measure(char) for char in ['>', '.'])
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self.canvas.configure(width=char_width * 3 + 4)
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self.font = font
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self.change_callback()
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def update_colors(self):
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"""Update the sidebar text colors, usually after config changes."""
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linenumbers_colors = idleConf.GetHighlight(idleConf.CurrentTheme(), 'linenumber')
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prompt_colors = idleConf.GetHighlight(idleConf.CurrentTheme(), 'console')
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foreground = prompt_colors['foreground']
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background = linenumbers_colors['background']
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self.colors = (foreground, background)
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self.canvas.configure(background=background)
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self.change_callback()
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def _linenumbers_drag_scrolling(parent): # htest #
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from idlelib.idle_test.test_sidebar import Dummy_editwin
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toplevel = tk.Toplevel(parent)
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text_frame = tk.Frame(toplevel)
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text_frame.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
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text_frame.rowconfigure(1, weight=1)
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text_frame.columnconfigure(1, weight=1)
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font = idleConf.GetFont(toplevel, 'main', 'EditorWindow')
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text = tk.Text(text_frame, width=80, height=24, wrap=tk.NONE, font=font)
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text.grid(row=1, column=1, sticky=tk.NSEW)
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editwin = Dummy_editwin(text)
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editwin.vbar = tk.Scrollbar(text_frame)
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linenumbers = LineNumbers(editwin)
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linenumbers.show_sidebar()
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text.insert('1.0', '\n'.join('a'*i for i in range(1, 101)))
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if __name__ == '__main__':
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from unittest import main
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main('idlelib.idle_test.test_sidebar', verbosity=2, exit=False)
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from idlelib.idle_test.htest import run
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run(_linenumbers_drag_scrolling)
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