interface_adjustable.v

module ui

import math

pub interface AdjustableWidget {
	size() (int, int)
mut:
	id      string
	justify []f64 // 0.0 means left, 0.5 center and 1.0 right (0.25 means 1/4 of the free space between size and adjusted size)
	x       int
	y       int
	ax      int // offset for adjusted x
	ay      int // offset for adjusted x
	set_pos(int, int)
	adj_size() (int, int)
}

// TODO: documentation
pub fn (mut w AdjustableWidget) get_align_offset(aw f64, ah f64) (int, int) {
	width, height := w.size()
	adj_width, adj_height := w.adj_size()
	$if aw_gao ? {
		if w.id in env('UI_IDS').split(',') {
			println('aw gao: ${w.id} (${width}, ${height}) vs (${adj_width}, ${adj_height})')
		}
	}
	dw := math.max(width - adj_width, 0)
	dh := math.max(height - adj_height, 0)
	return int(aw * dw), int(ah * dh)
}

fn (mut w AdjustableWidget) set_adjusted_pos(x int, y int) {
	w.ax, w.ay = w.get_align_offset(w.justify[0], w.justify[1])
	w.ax += x
	w.ay += y
	w.set_pos(x, y)
}

fn (w &AdjustableWidget) get_adjusted_pos() (int, int) {
	return w.ax, w.ay
}

pub const top_left = [0.0, 0.0]
pub const top_center = [0.5, 0.0]
pub const top_right = [1.0, 0.0]
pub const center_left = [0.0, 0.5]
pub const center = [0.5, 0.5]
pub const center_center = [0.5, 0.5]
pub const center_right = [1.0, 0.5]
pub const bottom_left = [0.0, 1.0]
pub const bottom_center = [0.5, 1.0]
pub const bottom_right = [1.0, 1.0]