This Pull Request introduces various changes to the editor's horizontal
scrolling, mostly focused on vim mode's horizontal scroll motions (`z
l`, `z h`, `z shift-l`, `z shift-h`). In order to make it easier to
review, the logical changes have been split into different sections.
## Cursor Position Update
Changes introduced on https://github.com/zed-industries/zed/pull/32558
added both `z l` and `z h` to vim mode but it only scrolled the editor's
content, without changing the cursor position. This doesn't reflect the
actual behavior of those motions in vim, so these two commits tackled
that, ensuring that the cursor position is updated, only when the cursor
is on the left or right edges of the editor:
-
https://github.com/zed-industries/zed/commit/ea3b866a763ba0bcfc12999ee1741c6528c895b7
-
https://github.com/zed-industries/zed/commit/805f41a913c6e86ef8be550d363a3cc2caeccbe9
## Horizontal Autoscroll Fix
After introducing the cursor position update to both `z l` and `z h` it
was noted that there was a bug with using `z l`, followed by `0` and
then `z l` again, as on the second use `z l` the cursor would not be
updated. This would only happen on the first line in the editor, and it
was concluded that it was because the
`editor::scroll::autoscroll::Editor.autoscroll_horizontally` method was
directly updating the scroll manager's anchor offset, instead of using
the `editor::scroll::Editor.set_scroll_position_internal` method, like
is being done by the vertical autoscroll
(`editor::scroll::autoscroll::Editor.autoscroll_vertically`).
This wouldn't update the scroll manager's anchor, which would still
think it was at `(0, 1)` so the cursor position would not be updated.
The changes in [this
commit](https://github.com/zed-industries/zed/commit/3957f02e189018ef559cd28516f0b872026b0ce1)
updated the horizontal autoscrolling method to also leverage
`set_scroll_position_internal`.
## Visible Column Count & Page Width Scroll Amount
The changes in
https://github.com/zed-industries/zed/commit/d83652c3ae1d0356fd7dca7b8922a0116de39ff0
add a `visible_column_count` field to `editor::scroll::ScrollManager`
struct, which allowed the introduction of the `ScrollAmount::PageWidth`
enum.
With these changes, two new actions are introduced,
`vim::normal::scroll::HalfPageRight` and
`vim::normal::scroll::HalfPageLeft` (in
https://github.com/zed-industries/zed/commit/7f344304d56337654a34b1b461a1dc69defd2e4e),
which move the editor half page to the right and half page to the left,
as well as the cursor position, which have also been mapped to `z
shift-l` and `z shift-h`, respectively.
Closes#17219
Release Notes:
- Improved `z l` and `z h` to actually move the cursor position, similar
to vim's behavior
- Added `z shift-l` and `z shift-h` to scroll half of the page width's
to the right or to the left, respectively
---------
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
Release Notes:
- Added initial support for both `z l` and `z h` in vim mode
These changes relate to #17219 but don't yet close the issue, as this
Pull Request is simply adding support for horizontal scrolling in vim
mode and actually moving the cursor to the correct column in the current
row will be handled in a different Pull Request.
Some notes on these changes:
- 2 new default keybindings added to vim's keymap
- `z l` which triggers the new `vim::ColumnRight` action
- `z h` which triggers the new `vim::ColumnLeft` action
- Introduced a new `ScrollAmount` variant, `ScrollAmount::Column(f32)`
to represent horizontal scrolling
- Replaced usage of `em_width` with `em_advance` to actually scroll by
the width of the cursor, instead of the width of the character
---------
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
This should have no user-visible impact.
For vim `.` to repeat it's important that actions are replayable.
Currently editor::MoveDown *sometimes* moves the cursor down, and
*sometimes* selects the next completion.
For replay we need to be able to separate the two.
After #2641 we noticed that scrolling didn't take a count parameter.
The PageDown/PageUp logic was also broken by an additional -1 (for both
vim mode and not).
DinoandConrad Irwin
Piotr Osiewicz
Kay Simmons