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-rw-r--r--helix-term/src/ui/popup.rs44
1 files changed, 44 insertions, 0 deletions
diff --git a/helix-term/src/ui/popup.rs b/helix-term/src/ui/popup.rs
index 3c140da4..62a6785a 100644
--- a/helix-term/src/ui/popup.rs
+++ b/helix-term/src/ui/popup.rs
@@ -22,6 +22,7 @@ pub struct Popup<T: Component> {
auto_close: bool,
ignore_escape_key: bool,
id: &'static str,
+ has_scrollbar: bool,
}
impl<T: Component> Popup<T> {
@@ -37,6 +38,7 @@ impl<T: Component> Popup<T> {
auto_close: false,
ignore_escape_key: false,
id,
+ has_scrollbar: true,
}
}
@@ -128,6 +130,14 @@ impl<T: Component> Popup<T> {
}
}
+ /// Toggles the Popup's scrollbar.
+ /// Consider disabling the scrollbar in case the child
+ /// already has its own.
+ pub fn with_scrollbar(mut self, enable_scrollbar: bool) -> Self {
+ self.has_scrollbar = enable_scrollbar;
+ self
+ }
+
pub fn contents(&self) -> &T {
&self.contents
}
@@ -228,6 +238,40 @@ impl<T: Component> Component for Popup<T> {
let inner = area.inner(&self.margin);
self.contents.render(inner, surface, cx);
+
+ // render scrollbar if contents do not fit
+ if self.has_scrollbar {
+ let win_height = inner.height as usize;
+ let len = self.child_size.1 as usize;
+ let fits = len <= win_height;
+ let scroll = self.scroll;
+ let scroll_style = cx.editor.theme.get("ui.menu.scroll");
+
+ const fn div_ceil(a: usize, b: usize) -> usize {
+ (a + b - 1) / b
+ }
+
+ if !fits {
+ let scroll_height = div_ceil(win_height.pow(2), len).min(win_height);
+ let scroll_line = (win_height - scroll_height) * scroll
+ / std::cmp::max(1, len.saturating_sub(win_height));
+
+ let mut cell;
+ for i in 0..win_height {
+ cell = &mut surface[(inner.right() - 1, inner.top() + i as u16)];
+
+ cell.set_symbol("▐"); // right half block
+
+ if scroll_line <= i && i < scroll_line + scroll_height {
+ // Draw scroll thumb
+ cell.set_fg(scroll_style.fg.unwrap_or(helix_view::theme::Color::Reset));
+ } else {
+ // Draw scroll track
+ cell.set_fg(scroll_style.bg.unwrap_or(helix_view::theme::Color::Reset));
+ }
+ }
+ }
+ }
}
fn id(&self) -> Option<&'static str> {