summaryrefslogtreecommitdiff
path: root/helix-view/src/view.rs
diff options
context:
space:
mode:
authorJan Hrastnik2020-10-01 19:16:24 +0000
committerBlaž Hrastnik2020-10-04 06:40:16 +0000
commitdc11124df54cd4f03d5bfa814e33262643483e87 (patch)
treed928daa1834f4a457f4982dae8fe3a84792f7a86 /helix-view/src/view.rs
parent956ccc7b5ccd0287ebae50ff5ce5309fb1d1c5dc (diff)
added tab to insert mode
Diffstat (limited to 'helix-view/src/view.rs')
-rw-r--r--helix-view/src/view.rs52
1 files changed, 50 insertions, 2 deletions
diff --git a/helix-view/src/view.rs b/helix-view/src/view.rs
index d96752d0..ac342d61 100644
--- a/helix-view/src/view.rs
+++ b/helix-view/src/view.rs
@@ -1,9 +1,13 @@
use anyhow::Error;
-use std::path::PathBuf;
+use std::{borrow::Cow, path::PathBuf};
use crate::theme::Theme;
-use helix_core::State;
+use helix_core::{
+ graphemes::{grapheme_width, RopeGraphemes},
+ Position, RopeSlice, State,
+};
+use tui::layout::Rect;
pub struct View {
pub state: State,
@@ -44,4 +48,48 @@ impl View {
self.first_line = line.saturating_sub(padding);
}
}
+
+ /// Calculates the last visible line on screen
+ #[inline]
+ pub fn last_line(&self, viewport: Rect) -> usize {
+ std::cmp::min(
+ (self.first_line + viewport.height - 1) as usize,
+ self.state.doc().len_lines() - 1,
+ )
+ }
+
+ /// Translates a document position to an absolute position in the terminal.
+ /// Returns a (line, col) position if the position is visible on screen.
+ // TODO: Could return width as well for the character width at cursor.
+ pub fn screen_coords_at_pos(
+ &self,
+ text: &RopeSlice,
+ pos: usize,
+ viewport: Rect,
+ ) -> Option<Position> {
+ let line = text.char_to_line(pos);
+
+ if line < self.first_line as usize || line > self.last_line(viewport) {
+ // Line is not visible on screen
+ return None;
+ }
+
+ let line_start = text.line_to_char(line);
+ let line_slice = text.slice(line_start..pos);
+ let mut col = 0;
+
+ for grapheme in RopeGraphemes::new(&line_slice) {
+ if grapheme == "\t" {
+ // TODO: this should be const TAB_WIDTH
+ col += 4;
+ } else {
+ let grapheme = Cow::from(grapheme);
+ col += grapheme_width(&grapheme);
+ }
+ }
+
+ let row = line - self.first_line as usize;
+
+ Some(Position::new(row, col))
+ }
}