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Added scrollbar dragging

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This commit is contained in:
Joshua Barretto 2025-09-25 11:38:47 +01:00
parent 07837f7761
commit 6a6bcec4ce
1 changed files with 38 additions and 15 deletions
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53
src/ui/input.rs
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@ -19,6 +19,8 @@ pub struct Input {
pub focus: [isize; 2],
// Remember the last area for things like scrolling
pub last_area: Area,
pub last_scroll_pos: Option<([isize; 2], usize, usize)>,
pub scroll_grab: Option<(usize, isize)>,
}
impl Input {
@ -129,16 +131,36 @@ impl Input {
buffer.select_all_cursor(cursor_id);
Ok(Resp::handled(None))
}
Some(Action::Mouse(MouseAction::Click, pos, false, _)) => {
let pos = [self.focus[0] + pos[0], self.focus[1] + pos[1]];
// If we're already in the right place, select the token instead
if let Some(cursor) = buffer.cursors.get(cursor_id)
&& cursor.selection().is_none()
&& buffer.text.to_coord(cursor.pos) == pos
Some(Action::Mouse(MouseAction::Click, pos, false, drag_id)) => {
if let Some((scroll_pos, h, _)) = self.last_scroll_pos
&& scroll_pos[0] == pos[0]
&& (scroll_pos[1]..=scroll_pos[1] + h as isize).contains(&pos[1])
{
buffer.select_token_cursor(cursor_id);
} else {
buffer.goto_cursor(cursor_id, pos, true);
self.scroll_grab = Some((drag_id, pos[1] - scroll_pos[1]));
} else if let Some(pos) = self.last_area.contains(pos) {
let pos = [self.focus[0] + pos[0], self.focus[1] + pos[1]];
// If we're already in the right place, select the token instead
if let Some(cursor) = buffer.cursors.get(cursor_id)
&& cursor.selection().is_none()
&& buffer.text.to_coord(cursor.pos) == pos
{
buffer.select_token_cursor(cursor_id);
} else {
buffer.goto_cursor(cursor_id, pos, true);
}
}
Ok(Resp::handled(None))
}
Some(Action::Mouse(MouseAction::Drag, pos, false, drag_id))
if self.scroll_grab.map_or(false, |(di, _)| di == drag_id) =>
{
if let Some(pos) = self.last_area.contains(pos)
&& let Some((_, offset)) = self.scroll_grab
&& let Some((_, scroll_sz, frame_sz)) = self.last_scroll_pos
{
self.focus[1] = ((pos[1] - offset).max(0) as usize
* buffer.text.lines().count()
/ frame_sz) as isize;
}
Ok(Resp::handled(None))
}
@ -341,18 +363,19 @@ impl Input {
let line_count = buffer.text.lines().count();
let frame_sz = outer_frame.size()[1].saturating_sub(2).max(1);
let scroll_sz = (frame_sz * frame_sz / line_count).max(1).min(frame_sz);
if scroll_sz != frame_sz {
self.last_scroll_pos = if scroll_sz != frame_sz {
let lines2 = line_count.saturating_sub(frame_sz).max(1);
let offset = frame_sz.saturating_sub(scroll_sz)
* (self.focus[1].max(0) as usize).min(lines2)
/ lines2;
let pos = [outer_frame.size()[0].saturating_sub(1), 1 + offset];
outer_frame
.rect(
[outer_frame.size()[0].saturating_sub(1), 1 + offset],
[1, scroll_sz],
)
.rect(pos, [1, scroll_sz])
.with_bg(Color::White)
.fill(' ');
}
Some((pos.map(|e| e as isize), scroll_sz, frame_sz))
} else {
None
};
}
}