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gh-103820: IDLE: Do not interpret buttons 4/5 as scrolling on non-X11 (…
…GH-103821)

Also fix test_mousewheel: do not skip a check which was broken due to incorrect
delta on Aqua and XQuartz, and probably not because of `.update_idletasks()`.
(cherry picked from commit d25d4ee)

Co-authored-by: Christopher Chavez <chrischavez@gmx.us>
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chrstphrchvz authored and miss-islington committed Feb 2, 2024
commit f588c72d84b0b693d724c90b9db6f845a37e6f89
5 changes: 3 additions & 2 deletions Lib/idlelib/editor.py
Original file line number Diff line number Diff line change
Expand Up @@ -166,8 +166,9 @@ def __init__(self, flist=None, filename=None, key=None, root=None):
text.bind("<3>",self.right_menu_event)

text.bind('<MouseWheel>', wheel_event)
text.bind('<Button-4>', wheel_event)
text.bind('<Button-5>', wheel_event)
if text._windowingsystem == 'x11':
text.bind('<Button-4>', wheel_event)
text.bind('<Button-5>', wheel_event)
text.bind('<Configure>', self.handle_winconfig)
text.bind("<<cut>>", self.cut)
text.bind("<<copy>>", self.copy)
Expand Down
22 changes: 14 additions & 8 deletions Lib/idlelib/idle_test/test_sidebar.py
Original file line number Diff line number Diff line change
Expand Up @@ -690,16 +690,22 @@ def test_mousewheel(self):
last_lineno = get_end_linenumber(text)
self.assertIsNotNone(text.dlineinfo(text.index(f'{last_lineno}.0')))

# Scroll up using the <MouseWheel> event.
# The meaning of delta is platform-dependent.
delta = -1 if sys.platform == 'darwin' else 120
sidebar.canvas.event_generate('<MouseWheel>', x=0, y=0, delta=delta)
# Delta for <MouseWheel>, whose meaning is platform-dependent.
delta = 1 if sidebar.canvas._windowingsystem == 'aqua' else 120

# Scroll up.
if sidebar.canvas._windowingsystem == 'x11':
sidebar.canvas.event_generate('<Button-4>', x=0, y=0)
else:
sidebar.canvas.event_generate('<MouseWheel>', x=0, y=0, delta=delta)
yield
if sys.platform != 'darwin': # .update_idletasks() does not work.
self.assertIsNone(text.dlineinfo(text.index(f'{last_lineno}.0')))
self.assertIsNone(text.dlineinfo(text.index(f'{last_lineno}.0')))

# Scroll back down using the <Button-5> event.
sidebar.canvas.event_generate('<Button-5>', x=0, y=0)
# Scroll back down.
if sidebar.canvas._windowingsystem == 'x11':
sidebar.canvas.event_generate('<Button-5>', x=0, y=0)
else:
sidebar.canvas.event_generate('<MouseWheel>', x=0, y=0, delta=-delta)
yield
self.assertIsNotNone(text.dlineinfo(text.index(f'{last_lineno}.0')))

Expand Down
10 changes: 6 additions & 4 deletions Lib/idlelib/tree.py
Original file line number Diff line number Diff line change
Expand Up @@ -285,8 +285,9 @@ def drawtext(self):
self.label.bind("<1>", self.select_or_edit)
self.label.bind("<Double-1>", self.flip)
self.label.bind("<MouseWheel>", lambda e: wheel_event(e, self.canvas))
self.label.bind("<Button-4>", lambda e: wheel_event(e, self.canvas))
self.label.bind("<Button-5>", lambda e: wheel_event(e, self.canvas))
if self.label._windowingsystem == 'x11':
self.label.bind("<Button-4>", lambda e: wheel_event(e, self.canvas))
self.label.bind("<Button-5>", lambda e: wheel_event(e, self.canvas))
self.text_id = id

def select_or_edit(self, event=None):
Expand Down Expand Up @@ -460,8 +461,9 @@ def __init__(self, master, **opts):
self.canvas.bind("<Key-Up>", self.unit_up)
self.canvas.bind("<Key-Down>", self.unit_down)
self.canvas.bind("<MouseWheel>", wheel_event)
self.canvas.bind("<Button-4>", wheel_event)
self.canvas.bind("<Button-5>", wheel_event)
if self.canvas._windowingsystem == 'x11':
self.canvas.bind("<Button-4>", wheel_event)
self.canvas.bind("<Button-5>", wheel_event)
#if isinstance(master, Toplevel) or isinstance(master, Tk):
self.canvas.bind("<Alt-Key-2>", self.zoom_height)
self.canvas.focus_set()
Expand Down
Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Revise IDLE bindings so that events from mouse button 4/5 on non-X11
windowing systems (i.e. Win32 and Aqua) are not mistaken for scrolling.