68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
package layout
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import (
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"fmt"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type MasonryOptions struct {
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// Columns is zero for 3.
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Columns int
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// Gap is zero for 4.
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Gap int
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}
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// Masonry puts each item into the shortest column.
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func Masonry(c *ui.Context, heights []int, o MasonryOptions, item func(i int)) *ui.Element {
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k := pixel.K(c)
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gap := pixel.Or("Masonry Gap", o.Gap, 4)
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n := pixel.Or("Masonry Columns", o.Columns, 3)
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cols := lanes(heights, n, gap)
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row := ui.Row(c).FillWidth().Gap(k.D(gap)).AlignItems(ui.Start)
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w, check := pixel.WrapWidth(c, row)
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widths := shares(w-gap*(n-1), n)
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return row.Draw(func(p *ui.Painter, r ui.Rect) { check(r) }).Children(func() {
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for j, lane := range cols {
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ui.Column(c).Width(k.D(widths[j])).Gap(k.D(gap)).Children(func() {
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for _, i := range lane {
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ui.Box(c).FillWidth().Height(k.D(heights[i])).Clip().Children(func() { item(i) })
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}
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})
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}
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})
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}
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// shares splits total into n whole parts, the first larger.
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func shares(total, n int) []int {
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out := make([]int, n)
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for i := range out {
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out[i] = max(0, total/n)
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if i < total%n {
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out[i]++
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}
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}
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return out
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}
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// lanes deals items into n columns, shortest first.
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func lanes(heights []int, n, gap int) [][]int {
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out, tall := make([][]int, n), make([]int, n)
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for i, h := range heights {
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if h <= 0 {
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panic(fmt.Sprintf("layout: Masonry height %d at %d", h, i))
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}
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j := 0
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for k := range tall {
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if tall[k] < tall[j] {
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j = k
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}
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}
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out[j] = append(out[j], i)
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tall[j] += h + gap
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}
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return out
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}
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