[issue24776] IDLE: Improve config dialog font change user interface

[Terry J. Reedy]

Change by Terry J. Reedy :


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versions: +Python 3.8 -Python 3.6

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[issue24776] IDLE: Improve config dialog font change user interface

[Terry J. Reedy]

Terry J. Reedy  added the comment:

I now think that the proper widget for font resizing might be a ttk.Spinbox 
(but see below).  #33962 discusses issues around using this widget. 

#33397 is about adding local font resizing with hot key or mousewheel to text 
and help viewers via a new FontSizer class. Font Sizer should be usable with 
the sample Text instance.  Size changes in the sample should propagate to the 
size widget.  When done, it might suffice to use a simple entry box for font 
size.  We already use them for counts on the General tab.

Since we do not want to encourage indent changes, I think the indent widget 
should be an entry box with bounds check.

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[issue24776] IDLE: Improve config dialog font change user interface

[Terry J. Reedy]

Terry J. Reedy added the comment:

I decided to rearrange page #24776 before changing sample #13802.

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dependencies: +IDLE: Add config dialog font page tests -IDLE Prefernces/Fonts: 
use multiple alphabets in examples

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[issue24776] IDLE: Improve config dialog font change user interface

[Terry J. Reedy]

Terry J. Reedy added the comment:

Make this the master issue for improving the font tab user interface by 
improving components and rearranging them.  With basic tests done, I am moving 
this up in priority.

Related issues currently open.
#30870 (dependency) made Up/Down change font selection; unit test needed.
#27755 replaces IDLE's custom DynOptionMenu with ttk.Combobox.  Comboboxes 
allow key entry of a value and the arrow toggles. See msg298091 for comparison 
and evaluation for font page.
#13802 (dependency) is about the improving the sample display.
#17642 is about font resizing by hot key and wheel in editor.
#20917 is about the font change notification system.

Additional changes for this issue or new related issues.

* Selecting a font by name (as well as a font size by number) can be done with 
an entry box with a validator linked to the listbox.  If a ttk Combobox can be 
locked open, I would try that.  See #27755.  For a demo of another alternative, 
run the tk fontchooser.

import tkinter
root = tkinter.Tk()
root.tk.call('tk', 'fontchooser', 'show')

For IDLE, I like some parts, not others.  I view it as an alternate mockup for 
ideas to build on.

* Mark's mockup removes "Base Editor Font".  If an editor window can have its 
font individually resized, then the settings on the font page define just that. 
 'Font Size' would then have to be 'Starting [or Default] Font Size'. 

* Font size a slider?  I am not convinced.  It would have to be vertical to go 
up to 40.  (I added larger sizes by request for classroom projector use.)  On 
the other hand, it would allow any size in the given range.  A spinbox that 
could be spun by mousewheel would also and stay compact.  Or use a ttk Combobox.

* See #13802 for discussion of sample display.

* Indent.  I don't understand "cries out to be moved (usually when people are 
intending to increase their font size)."  But I think it take too much space 
and should be shrunk to a spin box or drop box.  Reduced to a single line, I am 
thinking of moving it to the General tab, or perhaps a new Editor tab.  It does 
not particularly belong with font selection.

* Factor the Font page, with associated Variables and their tracers, other 
attributes, and methods, into a FontPage class.

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dependencies: +IDLE Prefernces/Fonts: use multiple alphabets in examples, IDLE: 
configdialog/fonts: change font when select by key up/down, Retire 
DynOptionMenu with a ttk Combobox
priority: low -> normal
title: Improve Fonts/Tabs UX for IDLE -> IDLE: Improve config dialog font 
change user interface
versions: +Python 3.7 -Python 3.5

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