[issue34047] Scrolling in IDLE for OS X is not working correctly when reaching end of file

[Terry J. Reedy]

Terry J. Reedy  added the comment:

1 down, but how about my other questions?
Is there only a problem if the slider is the first thing touched?
Is there still a problem if the line "return 'break'" in 
idlelib.editor.EditorWindow.handle_yview is deleted or disabled by prefixig it 
with '#'?  (Are you allowed to edit stdlib files?)
Do you see any messages if you start IDLE in a terminal?

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[issue34047] Scrolling in IDLE for OS X is not working correctly when reaching end of file

[Bruce Elgort]

Bruce Elgort  added the comment:

2.7.15 scrolling is working just fine.

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[issue34047] Scrolling in IDLE for OS X is not working correctly when reaching end of file

[Terry J. Reedy]

Terry J. Reedy  added the comment:

There are 3 ways to scroll by key in each direction: Arrow Down/Up, Page 
Down/Up, and Cntl End/Home.  There are 4 ways to scroll by mouse, in each 
direction: Mousewheel down/up, Scrollbar arrow bottom/top (== Arrow keys), 
Scrollbar trough below/above slider (= Page keys), and Scrollbar slider.

On Windows, if I Load Module idlelib.editor and go to the bottom, with the text 
cursor on the last line, all up methods work.  Bruce, which of the four mouse 
up methods don't work for you?  Just grabbing the slider, as Ned found?  What 
happens is you move the slider down, and try to move up without releasing the 
button?

Cheryl or Tal, can one of you check on Linux?

In the text area, the mouse pointer, for me, is a vertical bar and the slider 
is a light gray.  When I move the mouse over the scrollbar slider, the slider 
become active and ready to click on.  The indication is that the mouse pointer 
becomes an arrow pointing up left and the slider turns dark gray.  When the 
mouse is over the scrollbar trough or arrows, the slider only darkens to medium 
gray.  When over an arrow, the arrow darkens. Bruce, do you see the 
'activation' change when the slider is at the bottom and you mouse over it, but 
cannot grab it?


In May, we changed the 3.6+ editor text/mousewheel/scrollbar interaction a bit 
so that the text scrolled by lines, rather than by pixel. #33664, PR 7351. 
There is always a complete line at the top -- unless one changes the window 
height to a non-integral number of lines and moves the cursor to the last line. 
 (Then the complete lines are at the bottom until one moves the cursor to the 
top line  -- Cheryl, we should try to fix this.)

The patch changed the command function that the scrollbar calls when it is 
clicked or the slider is moved to editor.EditorWindow.handle_yview. The new 
function has an extraneous "return 'break'" that can and should be removed.  
But I doubt that is the problem.  It also has new code that is only executed 
for slider movements.

If only the slider has a problem and this slider code were to raise when at the 
bottom, we might have an explanation.  I am dubious, as the only possible 
platform-specific calls are the tkinter calls text.index('end') and 
text.index('@0.0').  To check this anyway, please start IDLE in the Mac 
terminal with 'python3 -m idlelib'  (correct on Mac?) and repeat the failing 
action and see if a traceback appears.

It might also help to know if 2.7 or 3.5- have the same problem.

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nosy: +cheryl.sabella, taleinat

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[issue34047] Scrolling in IDLE for OS X is not working correctly when reaching end of file

[Ned Deily]

Ned Deily  added the comment:

I think I am able to reproduce that behavior (I'm using IDLE from a python.org 
10.9+ installer).  What I'm seeing is that if you scroll to the bottom of a 
file that exceeds the length of the open text window and then click on and try 
to move the position indicator in the scroll bar, the position indicator does 
not move nor does the file scroll.  But if I then click elsewhere in the scroll 
bar and then try to grab and move the indicator, it works OK.  So perhaps IDLE 
is overriding a text widget event or some such.  FWIW a quick test in the 
wish8.6 text demo seems to work OK.

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nosy: +ned.deily

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[issue34047] Scrolling in IDLE for OS X is not working correctly when reaching end of file

[Bruce Elgort]

Change by Bruce Elgort :


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title: Scrolling in IDLE for OS X is not working -> Scrolling in IDLE for OS X 
is not working correctly when reaching end of file

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