lsp: Hover documentation draft.

1 files changed, 95 insertions, 0 deletions

diff --git a/helix-term/src/ui/popup.rs b/helix-term/src/ui/popup.rs
new file mode 100644
index 00000000..ca860707
--- /dev/null
+++ b/helix-term/src/ui/popup.rs
@@ -0,0 +1,95 @@
+use crate::compositor::{Component, Compositor, Context, EventResult};
+use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
+use tui::buffer::Buffer as Surface;
+use tui::{
+    layout::Rect,
+    style::{Color, Style},
+    widgets::{Block, Borders},
+};
+
+use std::borrow::Cow;
+
+use helix_core::Position;
+use helix_view::Editor;
+
+pub struct Popup {
+    contents: String,
+    position: Position,
+}
+
+impl Popup {
+    // TODO: it's like a slimmed down picker, share code? (picker = menu + prompt with different
+    // rendering)
+    pub fn new(contents: String) -> Self {
+        Self {
+            contents,
+            position: Position::default(),
+        }
+    }
+
+    pub fn set_position(&mut self, pos: Position) {
+        self.position = pos;
+    }
+}
+
+impl Component for Popup {
+    fn handle_event(&mut self, event: Event, cx: &mut Context) -> EventResult {
+        let event = match event {
+            Event::Key(event) => event,
+            _ => return EventResult::Ignored,
+        };
+
+        let close_fn = EventResult::Consumed(Some(Box::new(
+            |compositor: &mut Compositor, editor: &mut Editor| {
+                // remove the layer
+                compositor.pop();
+            },
+        )));
+
+        match event {
+            // esc or ctrl-c aborts the completion and closes the menu
+            KeyEvent {
+                code: KeyCode::Esc, ..
+            }
+            | KeyEvent {
+                code: KeyCode::Char('c'),
+                modifiers: KeyModifiers::CONTROL,
+            } => {
+                return close_fn;
+            }
+            _ => (),
+        }
+        // for some events, we want to process them but send ignore, specifically all input except
+        // tab/enter/ctrl-k or whatever will confirm the selection/ ctrl-n/ctrl-p for scroll.
+        // EventResult::Consumed(None)
+        EventResult::Consumed(None)
+    }
+    fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
+        // render a box at x, y. Width equal to max width of item.
+        const MAX: usize = 15;
+        let rows = std::cmp::min(self.contents.lines().count(), MAX) as u16; // inefficient
+        let area = Rect::new(self.position.col as u16, self.position.row as u16, 80, rows);
+
+        // clear area
+        let background = cx.editor.theme.get("ui.popup");
+        for y in area.top()..area.bottom() {
+            for x in area.left()..area.right() {
+                let cell = surface.get_mut(x, y);
+                cell.reset();
+                // cell.symbol.clear();
+                cell.set_style(background);
+            }
+        }
+
+        // -- Render the contents:
+
+        let style = Style::default().fg(Color::Rgb(164, 160, 232)); // lavender
+
+        use tui::text::Text;
+        use tui::widgets::{Paragraph, Widget, Wrap};
+        let contents = Text::from(self.contents.clone());
+        let par = Paragraph::new(contents).wrap(Wrap { trim: false });
+
+        par.render(area, surface);
+    }
+}