Add manual scroll methods to scroll::Core

src/view/scroll/core.rs

@@ -498,15 +498,43 @@ impl Core {
  self.with(|s| s.set_scroll_x(enabled))
  }
 
+ /// Try to keep the given `rect` in view.
+ pub fn keep_in_view(&mut self, rect: Rect) {
+ let min = rect.bottom_right().saturating_sub(self.last_size);
+ let max = rect.top_left();
+ let (min, max) = (Vec2::min(min, max), Vec2::max(min, max));
+
+ self.offset = self.offset.or_min(max).or_max(min);
+ }
+
+ /// Scroll until the given point is visible.
+ pub fn scroll_to(&mut self, pos: Vec2) {
+ // The furthest top-left we can go
+ let min = pos.saturating_sub(self.last_size);
+ // How far to the bottom-right we can go
+ let max = pos;
+
+ self.offset = self.offset.or_min(max).or_max(min);
+ }
+
  /// Scroll until the given column is visible.
  pub fn scroll_to_x(&mut self, x: usize) {
- if x > self.offset.x + self.last_size.x {
+ if x >= self.offset.x + self.last_size.x {
  self.offset.x = 1 + x - self.last_size.x;
  } else if x < self.offset.x {
  self.offset.x = x;
  }
  }
 
+ /// Scroll until the given row is visible.
+ pub fn scroll_to_y(&mut self, y: usize) {
+ if y >= self.offset.y + self.last_size.y {
+ self.offset.y = 1 + y - self.last_size.y;
+ } else if y < self.offset.y {
+ self.offset.y = y;
+ }
+ }
+
  /// Programmatically scroll to the top of the view.
  pub fn scroll_to_top(&mut self) {
  let curr_x = self.offset.x;