Crate neco_editor_viewport 

Viewport geometry calculations for editor rendering.

Pure geometry: converts between byte offsets, logical/visual lines, and pixel coordinates. No DOM or Canvas dependency.

Structs

Rect

Axis-aligned rectangle in pixel coordinates.

ViewportLayout

Computed layout measurements.

ViewportMetrics

Host-injected font metrics. Plain struct (parameter bag).

VisualLineFrame

Enums

ViewportError

Errors returned by viewport operations.

Functions

caret_rect

Compute the pixel rectangle for the caret at offset.

caret_rect_with_width_policy

gutter_width

Compute the line-number gutter width for total_lines lines.

hit_test

Convert a click at pixel (x, y) to a byte offset in text.

hit_test_with_width_policy

line_top

Return the Y pixel coordinate for the top of visual_line.

scroll_to_reveal

Compute a new scroll_top that reveals the caret at offset, or None if already visible.

selection_rects

Compute the pixel rectangles that cover selection.

selection_rects_with_width_policy

visible_line_range

Returns (first_visual_line, last_visual_line) visible in the viewport.

visual_line_frame