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input: make wheel events mappable

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Un-grabbed wheel events are now passed through the mouse binding
matching logic, instead of being hardcoded to scrolling the terminal
contents.

They are mappable through the BTN_BACK and BTN_FORWARD buttons.

Since they're not actually button *presses*, they never generate a
click count other than 1. This limitation is documented, but not
checked in the config. This means it's possible to create bindings
like "BTN_BACK+3" (i.e. triple "click"). They will however never
trigger.

The old, hardcoded logic is now accessible through the new
scrollback-up-mouse and scrollback-down-mouse mouse
bindings. They (obiously) default to BTN_BACK and BTN_FORWARD,
respectively.

Example usage: keep the default of scrolling terminal contents with
the wheel, when used without modifiers, but map Control+wheel to font
zoom in/out:

  [mouse-bindings]
  font-increase=Control+BTN_FORWARD
  font-decrease=Control+BTN_BACK

(this also keeps the default key bindings to zoom in/out; ctrl-+ and
ctrl+-)

Closes #1077
This commit is contained in:
Daniel Eklöf 2023-09-18 16:36:39 +02:00
parent f0f0d02bf7
commit fe7aa25ad8
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6 changed files with 162 additions and 105 deletions
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foot.ini
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@ -190,6 +190,8 @@
# \x03=Mod4+c # Map Super+c -> Ctrl+c
[mouse-bindings]
# scrollback-up-mouse=BTN_BACK
# scrollback-down-mouse=BTN_FORWARD
# selection-override-modifiers=Shift
# primary-paste=BTN_MIDDLE
# select-begin=BTN_LEFT