Add scroll to textarea

src/widgets/components/textarea.rs

@@ -1,11 +1,11 @@
 use color_eyre::Result;
-use crossterm::event::Event;
+use crossterm::event::{Event, KeyCode, KeyEvent, KeyEventKind, KeyModifiers};
 use rat_cursor::HasScreenCursor;
 use ratatui::buffer::Buffer;
 use ratatui::layout::{Constraint, Direction, Layout, Rect};
 use ratatui::prelude::StatefulWidget;
 use ratatui::style::{Color, Stylize};
-use ratatui::text::Text;
+use ratatui::text::{Line, Span, Text};
 use ratatui::widgets::{Block, Borders, Paragraph, Widget};
 use tui_input::backend::crossterm::EventHandler;
 use tui_input::Input;
@@ -16,6 +16,8 @@ pub struct TextArea {
     title: String,
     style: TextAreaStyle,
     input_area: Option<Rect>,
+    scroll_offset: u16,
+    auto_scroll: bool,
     pub active: bool,
 }
 
@@ -41,14 +43,29 @@ impl StatefulWidget for TextArea {
         } else if matches!(self.style, TextAreaStyle::SingleLine) {
             let chunks = Layout::default()
                 .direction(Direction::Horizontal)
-                .constraints([Constraint::Percentage(10), Constraint::Fill(0)])
+                .constraints([Constraint::Max((self.title.len() + 1) as u16), Constraint::Fill(0)])
                 .split(area);
-            let text = Text::from(self.title);
-            let line = Paragraph::new(text);
-            let input_text = Text::from(input_value).fg(Color::White);
-            let paragraph = Paragraph::new(input_text).bg(Color::Green);
-            state.input_area = Some(chunks[1]);
-            line.render(chunks[0], buf);
+            let label_text = Text::from(self.title);
+            let label = Paragraph::new(label_text);
+
+            // let scroll_offset = if self.input.cursor() > chunks[1].width as usize {
+            //     self.input.cursor() - chunks[1].width as usize
+            // } else { 0 };
+
+            let input_text = Span::from(input_value.clone()).fg(Color::White);
+            let input_line = Line::from(input_text);
+            let paragraph = Paragraph::new(input_line)
+                .bg(Color::Green)
+                .scroll((0, self.scroll_offset));
+
+            if self.input_area.is_none() {
+                state.input_area = Some(chunks[1]);
+            }
+            else if let Some(area) = self.input_area && area != chunks[1] {
+                state.input_area = Some(chunks[1]);
+            }
+
+            label.render(chunks[0], buf);
             paragraph.render(chunks[1], buf);
         }
     }
@@ -60,26 +77,44 @@ impl HasScreenCursor for TextArea {
             return None;
         }
         let area = self.input_area.unwrap();
-        let width = area.width.max(3) - 3;
-        let scroll = self.input.visual_scroll(width as usize);
-        let x = (self.input.visual_cursor().max(scroll) - scroll) as u16;
+        let scroll = self.input.visual_scroll(1);
+        let x = self.input.visual_cursor().max(scroll) as u16 - self.scroll_offset;
         Some((area.x + x, area.y))
     }
 }
 
 impl TextArea {
-    pub fn new(title: &str, placeholder_text: &str, style: Option<TextAreaStyle>) -> Self {
+    pub fn new(title: &str, placeholder_text: &str, style: Option<TextAreaStyle>, auto_scroll: Option<bool>) -> Self {
         Self {
             input: Input::new(placeholder_text.to_string()),
             title: title.to_string(),
             active: false,
             style: style.unwrap_or(TextAreaStyle::SingleLine),
             input_area: None,
+            auto_scroll: auto_scroll.unwrap_or(true),
+            scroll_offset: 0
         }
     }
 
     pub fn handle_input(&mut self, event: &Event) -> Result<()> {
         let _ = self.input.handle_event(event);
+
+        if let Event::Key(key) = event &&
+            !matches!(key.kind, KeyEventKind::Release) &&
+            let Some(area) = self.input_area {
+
+            let cursor_pos = self.input.cursor() as u16;
+            if self.scroll_offset > cursor_pos {
+                self.scroll_offset = cursor_pos;
+            } else if cursor_pos >= area.width + self.scroll_offset {
+                self.scroll_offset = cursor_pos - area.width;
+            } else if self.auto_scroll && self.scroll_offset > 0 && (key.code.is_delete() || key.code.is_backspace()) {
+                self.scroll_offset -= 1;
+                // HACK: with_cursor function requires to be owned so use handle event
+                let _ = self.input.handle_event(&Event::Key(KeyEvent::new(KeyCode::Left, KeyModifiers::empty())));
+            }
+        }
+
         Ok(())
     }
 }

src/widgets/popups/folder.rs

@@ -11,7 +11,7 @@ pub struct AddFolderPopup {
 
 impl AddFolderPopup {
     pub fn new() -> Self {
-        let mut textarea = TextArea::new("Folder Path", "", None);
+        let mut textarea = TextArea::new("Folder Path", "", None, None);
         textarea.active = true;
         Self { textarea }
     }