This takes advantage of CSS variables and color expressions to improve
the `window-theme=ghostty` support. The only visibile difference from
the previous implementation is that the header bar will darken if the
Ghostty window is in the background, which is standard for GTK apps.
This is conditional at runtime. If Ghostty detects that you're running
against GTK 4.16 or newer it will use the CSS variables and color calcs.
If you're running against older versions it will use CSS classes to
achieve nearly the same effect.
This simplifies the math for calculating scroll vectors based on mouse
scroll events. This was done to fix inverted horizontal scrolling on
macOS with natural scrolling enabled. Many assertions were added for
assumptions and our preconditions are clearly documented.
The preconditions are:
* Apprt scroll offsets are negative down/left, positive up/right
* Terminal vertical scroll is postive down, negative up (opposite
since scroll for a terminal means how many rows to move down).
* `Surface.scrollCallback` is always call with an apprt offset.
* Apprt is responsible for implementing natural scrolling. Surface
always assumes negative is down/left.
GTK4 version 4.16 split the environment variable `GDK_DEBUG` into `GDK_DEBUG`
and `GDK_DISABLE`. This is being done by using the helper function `atLeast` to
handle certain versions accordingly.
`GSK_RENDERER` also only needs to be set in later GTK versions (>=1.14.0).
First, this commit modifies libghostty to use a single unified action
dispatch system based on a tagged union versus the one-off callback
system that was previously in place. This change simplifies the code on
both the core and consumer sides of the library. Importantly, as we
introduce new actions, we can now maintain ABI compatibility so long as
our union size does not change (something I don't promise yet).
Second, this moves a lot more of the functions call on a surface into
the action system. This affects all apprts and continues the previous
work of introducing a more unified API for optional surface features.
This is the way to override the color in libadwaita < 1.6. We can
transition to named colors, specifically headerbar-{fg,bg}-color for
libadwaita 1.6.
Fixes: #2266
Signed-off-by: Tristan Partin <tristan@partin.io>
Fixes#1547
The core change to make this work is to make the cursor position
callback support taking updated modifiers. On both macOS and GTK, cursor
position events also provide the pressed modifiers so we can pass those
in.
This prevents a GTK warning:
```
(process:354789): GLib-CRITICAL **: 19:07:01.853: Source ID 511 was not found when attempting to remove it
```
which happens when trying to clean a timer already used.
