Implemented the scrolling fucntion

1 files changed, 43 insertions, 5 deletions

diff --git a/src/hex.rs b/src/hex.rs
index 67f692d..7980252 100644
--- a/src/hex.rs
+++ b/src/hex.rs
@@ -1,27 +1,64 @@
 use std::{fs, io};
 use std::io::stdout;
 use ratatui::{backend::CrosstermBackend, Terminal};
+use ratatui::widgets::{ScrollbarState, ScrollDirection};
 use crossterm::{execute, terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen}};
 use crate::{input, render};
- 
+
 pub struct HexEditor {
     filename: String,
     data: Vec<u8>,
     cursor: usize,
-    terminal: Terminal<CrosstermBackend<std::io::Stdout>>,
+    terminal: Terminal<CrosstermBackend<std::io::Stdout>,>,
+    scrollbar_state: ScrollbarState,
+    scroll_position: usize
 }
 
 impl HexEditor {
+
     pub fn new(filename: String, data: Vec<u8>) -> io::Result<Self> {
         enable_raw_mode()?;
         execute!(stdout(), EnterAlternateScreen)?;
         let terminal = Terminal::new(CrosstermBackend::new(stdout()))?;
-        Ok(Self { filename, data, cursor: 0, terminal })
+        let line_count = (data.len() + 15) / 16;
+        let scrollbar_state = ScrollbarState::default()
+            .content_length(line_count)
+            .viewport_content_length(10);
+
+            Ok(Self {
+                filename,
+                data,
+                cursor: 0,
+                terminal,
+                scrollbar_state,
+                scroll_position: 0,
+            })
     }
 
+
     pub fn run(&mut self) -> io::Result<()> {
-        while input::handle_input(&mut self.cursor, &mut self.data[..])? {
-            render::draw(&mut self.terminal, &self.data, self.cursor, &self.filename)?;
+        while input::handle_input(
+            &mut self.cursor,
+            &mut self.data,
+            &mut self.scroll_position
+        )? {
+            let total_lines = (self.data.len() + 15) / 16;
+            let visible_lines = self.terminal.size()?.height as usize;
+
+
+            self.scrollbar_state = ScrollbarState::new(total_lines)
+                .viewport_content_length(visible_lines)
+                .position(self.scroll_position);
+
+
+            render::draw(
+                &mut self.terminal,
+                &self.data,
+                self.cursor,
+                &self.filename,
+                self.scroll_position,
+                &mut self.scrollbar_state
+            )?;
         }
         self.cleanup()
     }
@@ -32,4 +69,5 @@ impl HexEditor {
         fs::write(&self.filename, &self.data)?;
         Ok(())
     }
+
 }