76 lines
2.9 KiB
Text
76 lines
2.9 KiB
Text
# layout_shrink.ludic - flex-shrink: when a line's children want more room than it has, those that
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# shrink give it up, each in proportion to its shrink times its size, and none below what it must
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# keep (its min size, a fixed size, its content's). A scroll box keeps nothing - it scrolls - so a
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# list in a column takes the room its siblings leave; a box in a column shrinks as far as the scroll
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# boxes inside it let it, and anything else shrinks only when flex-shrink says so.
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function ly_shrink(dir: int, c: UiNode) -> float {
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if c.ex != null and c.ex.shrink >= 0.0 { return c.ex.shrink }
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if c.kind == UI_SCROLL { return 1.0 }
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if dir == UI_COL and c.kind == UI_BOX { return 1.0 }
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return 0.0
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}
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# how small a child may be pressed along the run, margins included
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function ly_floor(dir: int, c: UiNode) -> float {
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if dir == UI_ROW {
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var w = c.min_w
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if c.w >= 0.0 { w = Math.max(w, c.w) }
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return w + c.ml + c.mr
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}
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return Math.max(ly_min_h(c), c.min_h) + c.mt + c.mb
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}
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function ly_min_h(c: UiNode) -> float {
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if c.ex != null and c.ex.has_min { return c.ex.mh_min }
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return c.mh
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}
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# `sizes` (the children from..to) shrunk by `over` in all
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function ly_shrink_line(ui_st: mut UiState, depth: int, n: UiNode, from: int, sizes: []float, over0: float) -> void {
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var over = over0
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let frozen = ui_st.ly_frozen[depth]
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List.clear(frozen)
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for k in 0 .. len(sizes) { push(frozen, n.children[from + k].pos >= 2) }
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for pass in 0 .. 8 {
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var wsum = 0.0
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for k in 0 .. len(sizes) {
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if not frozen[k] { wsum = wsum + ly_shrink(n.dir, n.children[from + k]) * sizes[k] }
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}
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if wsum <= 0.0 or over <= 0.01 { return }
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var taken = 0.0
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for k in 0 .. len(sizes) {
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let c = n.children[from + k]
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let wk = ly_shrink(n.dir, c) * sizes[k]
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if frozen[k] or wk <= 0.0 { continue }
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let floor = Math.min(ly_floor(n.dir, c), sizes[k])
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var want = sizes[k] - over * wk / wsum
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if want <= floor {
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want = floor
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frozen[k] = true
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}
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taken = taken + sizes[k] - want
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sizes[k] = want
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}
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over = over - taken
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}
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}
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# how short the box can be pressed: a scroll box to its padding, a column to what its children can
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# be, a row to its tallest child's least; kept only when it is less than the box's own height
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function ly_min_note(n: UiNode) -> void {
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var m = n.mh
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if n.h < 0.0 and n.kind == UI_SCROLL { m = ly_vin(n) } else if n.h < 0.0 and n.kind == UI_BOX and n.children != null and not n.wrap {
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var sum = 0.0
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var count = 0
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for i in 0 .. len(n.children) {
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let c = n.children[i]
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if c.pos >= 2 { continue }
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let cm = ly_min_h(c) + c.mt + c.mb
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if n.dir == UI_ROW { sum = Math.max(sum, cm) } else { sum = sum + cm }
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if n.dir == UI_COL and count > 0 { sum = sum + n.gap }
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count += 1
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}
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m = ly_vin(n) + sum
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}
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m = ly_clamp(m, n.min_h, n.max_h)
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if m < n.mh - 0.01 {
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nx(n).mh_min = m
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n.ex.has_min = true
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} else if n.ex != null { n.ex.has_min = false }
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}
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