From 7162632eb739557ededaee902b23e48a577817b4 Mon Sep 17 00:00:00 2001
From: Blaž Hrastnik
Date: Thu, 25 Feb 2021 18:07:47 +0900
Subject: lsp: Hover documentation draft.

---
 helix-term/src/ui/editor.rs |  7 ++--
 helix-term/src/ui/mod.rs    |  2 +
 helix-term/src/ui/popup.rs  | 95 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 100 insertions(+), 4 deletions(-)
 create mode 100644 helix-term/src/ui/popup.rs

(limited to 'helix-term/src/ui')

diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index af9d0414..b071292c 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -100,6 +100,7 @@ impl EditorView {
         let mut spans = Vec::new();
         let mut visual_x = 0;
         let mut line = 0u16;
+        let text = view.doc.text();
 
         'outer: for event in highlights {
             match event.unwrap() {
@@ -113,7 +114,6 @@ impl EditorView {
                     // TODO: filter out spans out of viewport for now..
 
                     // TODO: do these before iterating
-                    let text = view.doc.text();
                     let start = text.byte_to_char(start);
                     let end = text.byte_to_char(end);
 
@@ -160,8 +160,7 @@ impl EditorView {
                             let grapheme = Cow::from(grapheme);
                             let width = grapheme_width(&grapheme) as u16;
 
-                            // ugh, improve with a traverse method
-                            // or interleave highlight spans with selection and diagnostic spans
+                            // ugh,interleave highlight spans with diagnostic spans
                             let is_diagnostic = view.doc.diagnostics.iter().any(|diagnostic| {
                                 diagnostic.range.0 <= char_index && diagnostic.range.1 > char_index
                             });
@@ -191,12 +190,12 @@ impl EditorView {
         // render selections
 
         if is_focused {
-            let text = view.doc.text().slice(..);
             let screen = {
                 let start = text.line_to_char(view.first_line);
                 let end = text.line_to_char(last_line + 1);
                 Range::new(start, end)
             };
+            let text = text.slice(..);
             let cursor_style = Style::default().bg(Color::Rgb(255, 255, 255));
 
             // cedar
diff --git a/helix-term/src/ui/mod.rs b/helix-term/src/ui/mod.rs
index e1899144..ea1d22ab 100644
--- a/helix-term/src/ui/mod.rs
+++ b/helix-term/src/ui/mod.rs
@@ -1,11 +1,13 @@
 mod editor;
 mod menu;
 mod picker;
+mod popup;
 mod prompt;
 
 pub use editor::EditorView;
 pub use menu::Menu;
 pub use picker::Picker;
+pub use popup::Popup;
 pub use prompt::{Prompt, PromptEvent};
 
 pub use tui::layout::Rect;
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);
+    }
+}
-- 
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