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Alt-modified mousewheel mode and other wheel tweaks #1234

Merged
merged 3 commits into from
Oct 4, 2023
Merged

Alt-modified mousewheel mode and other wheel tweaks #1234

merged 3 commits into from
Oct 4, 2023

Commits on Oct 4, 2023

  1. Avoid mixed line and page mousewheel scrolling 

    Don't convert line scrolling events to page scrolling events when they
exceed the terminal height, because we don't actually know how many
lines correspond to a page as far as the application is concerned, or
whether it supports page up/down events in the first place.

Also, scroll the scrollback by one line less than the terminal height
when scrolling by pages with the mousewheel, to match what we do for
PgUp/Dn presses.

Drop len argument from send_keys(), and use NUL-terminated strings
instead for more flexibility. Put the count argument first.
    @ak2
    ak2 committed Oct 4, 2023
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  2. Send Alt modifier with mousewheel events 

    If the Alt key is pressed, modify mousewheel events sent as cursor/page
up/down keycodes or as mintty's application wheel codes accordingly.

In nano, Alt+up/down means scrolling the window instead of moving the
cursor.

(The Shift and Ctrl modifiers are already used for modifying the scroll
distance per wheel notch to whole pages or single lines, so don't send
those.)
    @ak2
    ak2 committed Oct 4, 2023
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  3. Add Alt-modified mousewheel mode using DECSET 7765 

    When enabled, this sends Alt-modified cursor up/down keycodes for
mousewheel events. If the Alt key is pressed, unmodified keycodes are
sent. The mode does not affect page up/down codes.

In the nano editor from version 4.0, the Alt+Up/Down keycodes scroll the
window instead of moving the cursor. Scrolling straight away is the
proper action for the mousewheel, whereas moving the cursor only scrolls
once the cursor reaches the top or bottom.

Less can be configured to scroll on Alt+Up/Down with this in ~/.lesskey:
\e[1;3A back-line
\e[1;3B forw-line

Similarly, vim can be configured to do so with this in ~/.vimrc:
map <M-Up> <C-Y>
map <M-Down> <C-E>
imap <M-Up> <C-O><C-Y>
imap <M-Down> <C-O><C-E>
    @ak2
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