70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
package mujica
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import "github.com/egoist/mygo/ui"
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// StackAlign places children across a Stack's direction. Zero stretches a vertical stack and centers a horizontal one.
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type StackAlign int
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const (
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StackAlignAuto StackAlign = iota
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StackAlignStart
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StackAlignCenter
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StackAlignEnd
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StackAlignStretch
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)
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// StackOptions configure a Stack.
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type StackOptions struct {
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// Horizontal lays children left to right; otherwise top to bottom.
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Horizontal bool
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// Gap defaults to SpaceS.
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Gap Space
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Align StackAlign
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// Justify places children along the direction; zero is ui.Start.
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Justify ui.Align
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// Wrap moves children of a horizontal stack onto more lines.
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Wrap bool
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}
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// Stack arranges children in a row or column. Build children with StackItem to hide them without leaving a gap.
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func Stack(c *ui.Context, opts StackOptions, children func()) *ui.Element {
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if children == nil {
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panic("mujica: Stack needs children")
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}
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if opts.Wrap && !opts.Horizontal {
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panic("mujica: Stack Wrap needs Horizontal")
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}
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e := ui.Column(c)
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if opts.Horizontal {
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e.Row()
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}
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e.Gap(containerSpace(Density(c), opts.Gap, SpaceS)).Justify(opts.Justify)
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switch opts.Align {
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case StackAlignAuto:
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case StackAlignStart:
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e.AlignItems(ui.Start)
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case StackAlignCenter:
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e.AlignItems(ui.Center)
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case StackAlignEnd:
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e.AlignItems(ui.End)
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case StackAlignStretch:
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e.AlignItems(ui.Stretch)
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default:
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panic("mujica: invalid StackAlign")
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}
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if opts.Wrap {
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e.Wrap()
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}
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return e.Children(children)
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}
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// StackItem builds one child of a Stack unless hidden; a hidden item takes no room and no gap.
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func StackItem(hidden bool, build func()) {
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if build == nil {
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panic("mujica: StackItem needs build")
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}
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if !hidden {
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build()
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}
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}
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