69 lines
1.6 KiB
Go
69 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 GridLines uint8
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const (
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NoLines GridLines = iota
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SolidLines
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DottedLines
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)
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type GridOptions struct {
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// Columns is zero for 2.
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Columns int
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// Pad is around each cell's content; zero means 4.
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Pad int
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Lines GridLines
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}
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// Grid lays n cells in equal columns, lines between them.
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func Grid(c *ui.Context, n int, o GridOptions, cell func(i int)) *ui.Element {
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k := pixel.K(c)
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cols := pixel.Or("Grid Columns", o.Columns, 2)
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pad := pixel.Or("Grid Pad", o.Pad, 4)
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pixel.Or("Grid n", n, 0)
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if o.Lines > DottedLines {
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panic(fmt.Sprintf("layout: unknown grid lines %d", o.Lines))
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}
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grid := ui.Grid(c).FillWidth()
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w, check := pixel.WrapWidth(c, grid)
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tracks := make([]ui.Track, cols)
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for i, d := range shares(w, cols) {
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tracks[i] = ui.Fixed(k.D(d))
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}
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return grid.ColumnTracks(tracks...).Draw(func(p *ui.Painter, r ui.Rect) { check(r) }).Children(func() {
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for i := range n {
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right, below := edges(i, n, cols)
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ui.Box(c).Padding(k.D(pad)).Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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line := func(x, y, w, h int) {
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if o.Lines == DottedLines {
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g.Checker(x, y, w, h, pixel.Edge)
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} else if o.Lines == SolidLines {
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g.Rect(x, y, w, h, pixel.Edge)
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}
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}
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if right {
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line(g.W-1, 0, 1, g.H)
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}
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if below {
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line(0, g.H-1, g.W, 1)
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}
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}).Children(func() { cell(i) })
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}
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})
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}
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// edges reports neighbors right of and below cell i.
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func edges(i, n, cols int) (right, below bool) {
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return i%cols != cols-1 && i != n-1, i < (n-1)/cols*cols
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}
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