Split into category packages; module github.com/ZacharyZhang-NY/MujicaUI

layout/stack.go

@@ -0,0 +1,63 @@
+package layout
+
+import (
+	"github.com/egoist/mygo/ui"
+
+	"github.com/ZacharyZhang-NY/MujicaUI/core"
+)
+
+// StackAlign places children across a Stack's direction. Zero stretches a vertical stack and centers a horizontal one.
+type StackAlign int
+
+const (
+	StackAlignAuto StackAlign = iota
+	StackAlignStart
+	StackAlignCenter
+	StackAlignEnd
+	StackAlignStretch
+)
+
+// StackOptions configure a Stack.
+type StackOptions struct {
+	// Horizontal lays children left to right; otherwise top to bottom.
+	Horizontal bool
+	// Gap defaults to SpaceS.
+	Gap   Space
+	Align StackAlign
+	// Justify places children along the direction; zero is ui.Start.
+	Justify ui.Align
+	// Wrap moves children of a horizontal stack onto more lines.
+	Wrap bool
+}
+
+// Stack arranges children in a row or column. A child not built takes no room and no gap.
+func Stack(c *ui.Context, opts StackOptions, children func()) *ui.Element {
+	if children == nil {
+		panic("mujica: Stack needs children")
+	}
+	if opts.Wrap && !opts.Horizontal {
+		panic("mujica: Stack Wrap needs Horizontal")
+	}
+	e := ui.Column(c)
+	if opts.Horizontal {
+		e.Row()
+	}
+	e.Gap(containerSpace(core.Density(c), opts.Gap, SpaceS)).Justify(opts.Justify)
+	switch opts.Align {
+	case StackAlignAuto:
+	case StackAlignStart:
+		e.AlignItems(ui.Start)
+	case StackAlignCenter:
+		e.AlignItems(ui.Center)
+	case StackAlignEnd:
+		e.AlignItems(ui.End)
+	case StackAlignStretch:
+		e.AlignItems(ui.Stretch)
+	default:
+		panic("mujica: invalid StackAlign")
+	}
+	if opts.Wrap {
+		e.Wrap()
+	}
+	return e.Children(children)
+}