very basic scroll

AmazonQ.md

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+# Text Scrolling Implementation in Simplicitty
+
+This document outlines the implementation of text scrolling in the Simplicitty terminal emulator project.
+
+## Overview
+
+The implementation adds the ability to scroll through text content when it doesn't fit completely in the window. The scrolling is implemented on a line-by-line basis, allowing users to navigate through the content using keyboard shortcuts.
+
+## Key Components
+
+1. **Scroll State Management**:
+   - Added `scroll_offset` to track the current scroll position (in visual lines)
+   - Added `max_scroll_offset` to limit scrolling to available content
+
+2. **Viewport Calculation**:
+   - Modified `get_visible_line_range()` to consider the scroll offset when determining visible lines
+   - Added `update_max_scroll_offset()` to recalculate the maximum scroll position based on content and viewport size
+
+3. **Scrolling Methods**:
+   - `scroll_up(lines)`: Move viewport up by specified number of lines
+   - `scroll_down(lines)`: Move viewport down by specified number of lines
+   - `page_up()`: Scroll up by one page (viewport height)
+   - `page_down()`: Scroll down by one page (viewport height)
+
+4. **Keyboard Controls**:
+   - Ctrl+Up/Down: Scroll one line up/down
+   - Page Up/Down: Scroll one page up/down
+   - Ctrl+Home/End: Scroll to top/bottom of content
+
+## Implementation Details
+
+The scrolling implementation works by adjusting the `scroll_offset` value, which determines which visual lines are rendered in the viewport. The `get_visible_line_range()` function uses this offset to calculate which logical lines should be rendered.
+
+When the window is resized or content changes, the `max_scroll_offset` is recalculated to ensure scrolling remains within valid bounds.
+
+## Future Improvements
+
+1. Add mouse wheel support for scrolling
+2. Implement smooth scrolling animations
+3. Add a visual scrollbar indicator
+4. Preserve horizontal scroll position when navigating vertically