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Adjust scroll() to match kakoune: only scroll the view if cursor in bounds.

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This commit is contained in:
Blaž Hrastnik 2021-04-14 14:27:47 +09:00
parent dfb1ae2d33
commit 180521fefe
2 changed files with 22 additions and 14 deletions
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16
helix-term/src/commands.rs
View file

@ -450,10 +450,11 @@ fn scroll(cx: &mut Context, offset: usize, direction: Direction) {
return;
}
let scrolloff = PADDING; // min(user pref, half win width/height)
let scrolloff = PADDING.min(view.area.height as usize / 2); // TODO: user pref
// cursor visual offset
let cursor_off = cursor.row - view.first_line;
// TODO: only if dragging via mouse?
// let cursor_off = cursor.row - view.first_line;
view.first_line = match direction {
Forward => view.first_line + offset,
@ -461,14 +462,19 @@ fn scroll(cx: &mut Context, offset: usize, direction: Direction) {
}
.min(doc_last_line);
// recalculate last line
let last_line = view.last_line(doc);
// clamp into viewport
let line = (view.first_line + cursor_off)
.max(view.first_line + scrolloff)
.min(last_line.saturating_sub(scrolloff));
let line = cursor.row.clamp(
view.first_line + scrolloff,
last_line.saturating_sub(scrolloff),
);
let text = doc.text().slice(..);
let pos = pos_at_coords(text, Position::new(line, cursor.col)); // this func will properly truncate to line end
// TODO: only manipulate main selection
doc.set_selection(view.id, Selection::point(pos));
}

20
helix-view/src/view.rs
View file

@ -81,26 +81,28 @@ impl View {
let pos = coords_at_pos(doc.text().slice(..), cursor);
let line = pos.row;
let col = pos.col;
let last_line = self.first_line + (self.area.height as usize).saturating_sub(2);
let last_line = self.last_line(doc);
let scrolloff = PADDING.min(self.area.height as usize / 2); // TODO: user pref
// TODO: not ideal
const OFFSET: usize = 7; // 1 diagnostic + 5 linenr + 1 gutter
let last_col = self.first_col + (self.area.width as usize - OFFSET);
if line > last_line.saturating_sub(PADDING) {
if line > last_line.saturating_sub(scrolloff) {
// scroll down
self.first_line += line - (last_line.saturating_sub(PADDING));
} else if line < self.first_line + PADDING {
self.first_line += line - (last_line.saturating_sub(scrolloff));
} else if line < self.first_line + scrolloff {
// scroll up
self.first_line = line.saturating_sub(PADDING);
self.first_line = line.saturating_sub(scrolloff);
}
if col > last_col.saturating_sub(PADDING) {
if col > last_col.saturating_sub(scrolloff) {
// scroll right
self.first_col += col - (last_col.saturating_sub(PADDING));
} else if col < self.first_col + PADDING {
self.first_col += col - (last_col.saturating_sub(scrolloff));
} else if col < self.first_col + scrolloff {
// scroll left
self.first_col = col.saturating_sub(PADDING);
self.first_col = col.saturating_sub(scrolloff);
}
}