Viewport¶

Scrollable content pane with keyboard and mouse navigation and a scrollbar indicator. Implements Component and Themed.

Construction¶

func NewViewport() *Viewport

Usage¶

vp := blit.NewViewport()
vp.SetContent(longTextContent)

Set content at any time — the scroll position resets to the top.

Scrollbar¶

Viewport renders a scrollbar on the right edge using track and thumb glyphs from the theme. The thumb size and position reflect the visible portion of the content.

Keybindings¶

Key	Action
`up` / `k`	Scroll up 1 line
`down` / `j`	Scroll down 1 line
`pgup`	Page up
`pgdn`	Page down
`home`	Scroll to top
`end`	Scroll to bottom
`ctrl+u`	Half page up
`ctrl+d`	Half page down
Mouse wheel	Scroll ±3 lines

State¶

Method	Description
`SetContent(content)`	Set text content, reset scroll
`ScrollBy(delta)`	Scroll by lines (positive = down)
`GotoTop()`	Scroll to top
`GotoBottom()`	Scroll to bottom
`YOffset()`	Current scroll offset
`AtTop()`	Whether scrolled to top
`AtBottom()`	Whether scrolled to bottom