panel auto_split patch

[Joel Newkirk <mc-devel newkirk us>]

(NOT Subscribed To List)

On some platforms (such as Freerunner, with 2.8" screen) it is a common 
occurrence for the screen orientation to change portrait<->landscape, 
and also for size to be too small in one dimension for comfortable 
visual layout. (IE, vertical_split is awkward when portrait-mode console 
is <50 characters wide)  Also, on most platforms it's quite reasonable 
to presume that the window dimensions are subject to change, and that 
those changes can quite easily involve severe limitation in one dimension.

But if you have selected 'vertical split' for example, and then change 
the X*Y proportions of the window sufficiently, things can get too 
cramped.  So I propose 'auto_split' option - if selected by user, then 
split will be automatically horizontal or vertical, depending on whether 
height*2>COLS.  (a somewhat arbitrary proportion I've found to work well 
in my tests so far - essentially, with most fonts, if the window is 
square or wider it chooses Vertical, if narrower it chooses Horizontal) 

It's a simple patch (against 4.6.1), entailing a few additions and a few 
alterations to layout.c, and adding 'extern int auto_split;' to layout.h 
and '{ "auto_split", &auto_split },' to layout[] in setup.c.  It may not 
be correct, but so far it 'works for me'.  (it gets quite frustrating 
after a while using mc on a handheld, when switching from portrait to 
landscape means you need to pull down Options->layout, change 
horizontal|vertical split, & save - you don't necessarily change 
orientation frequently, but mc could be invoked while in either mode, 
and it would be very helpful if it were able to adapt) 

The only potential bug I've seen is that numerically-specified panel 
sizes get bungled if 'auto split' is selected in the Layout dialog while 
'equal split' is not set. (when changing from vertical to horizontal in 
the layout dialog with 'equal split' not set, it forces reversion to 
50%/50%, however for an 'auto split' scenario it really isn't sensible 
to talk about absolute split dimensions - but when it comes down to it, 
it doesn't really make much sense to have column/row counts for manual 
unequal split to begin with, when window dimensions and fonts are 
subject to unpredictable changes)

j

Joel Newkirk
mc-devel newkirk us

78a79,81
> /* Set if the panel split horiz vs vert choice is handled 
automatically based on terminal dimensions */
> int auto_split=0;
>
123a127
> static int _auto_split;
170a175
>     { N_("&Auto split"),       &auto_split,   0 },
183a189,196
>     if (_auto_split)
>     {
>     _horizontal_split=0;
>     if (height*2<COLS)
>     {
>         _horizontal_split=1;
>     }
>     }
217c230
<     dlg_move (layout_dlg, 6, 6);
---
>     dlg_move (layout_dlg, 7, 6);
219c232
<     dlg_move (layout_dlg, 6, 18);
---
>     dlg_move (layout_dlg, 7, 18);
295a309
>     _auto_split = check_options [9].widget->state & C_BOOL;
370c384
<     for (i = 0; i <= 8; i++) {
---
>     for (i = 0; i <= 9; i++) {
425,426c439,440
<     add_widget (layout_dlg, groupbox_new (4, 2, first_width, 6, title1));
<     add_widget (layout_dlg, groupbox_new (4, 8, first_width, 4, title2));
---
>     add_widget (layout_dlg, groupbox_new (4, 2, first_width, 7, title1));
>     add_widget (layout_dlg, groupbox_new (4, 9, first_width, 4, title2));
467a482,483
>
>
469c485
<     button_new (6, 15, B_2RIGHT, NARROW_BUTTON, "&>", b2right_cback);
---
>     button_new (7, 15, B_2RIGHT, NARROW_BUTTON, "&>", b2right_cback);
472c488
<     button_new (6, 9, B_2LEFT, NARROW_BUTTON, "&<", b2left_cback);
---
>     button_new (7, 9, B_2LEFT, NARROW_BUTTON, "&<", b2left_cback);
474c490
<     check_options[6].widget = check_new (5, 6, XTRACT (6));
---
>     check_options[6].widget = check_new (6, 6, XTRACT (6));
481a498,499
>     check_options[9].widget = check_new (5, 6, XTRACT (9));
>     add_widget (layout_dlg, check_options[9].widget);
528a547,554
>     if (auto_split)
>     {
>     horizontal_split=0;
>     if (height*2>COLS)
>     {
>         horizontal_split=1;
>     }
>     }