87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
package layout
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import (
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"github.com/egoist/mygo/ui"
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"github.com/ZacharyZhang-NY/MujicaUI/core"
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"github.com/ZacharyZhang-NY/MujicaUI/theme"
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)
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// Space is a spacing step scaled by the window's density. Zero picks the component's default.
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type Space int
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const (
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SpaceDefault Space = iota
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SpaceNone
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SpaceXS // 1 unit, 4 DIPs at default density
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SpaceS // 2 units
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SpaceM // 3 units
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SpaceL // 4 units
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SpaceXL // 6 units
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SpaceXXL // 8 units
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)
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// containerSpace returns s in DIPs for density d, using def when s is SpaceDefault.
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func containerSpace(d theme.Density, s, def Space) float32 {
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if s == SpaceDefault {
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s = def
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}
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var u float32
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switch s {
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case SpaceNone:
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case SpaceXS:
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u = 1
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case SpaceS:
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u = 2
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case SpaceM:
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u = 3
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case SpaceL:
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u = 4
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case SpaceXL:
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u = 6
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case SpaceXXL:
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u = 8
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default:
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panic("mujica: invalid Space value")
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}
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return u * d.Unit()
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}
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// ContainerOptions configure a Container.
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type ContainerOptions struct {
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// Padding defaults to SpaceL.
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Padding Space
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// MaxWidth caps the width in DIPs; zero leaves it unbounded.
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MaxWidth float32
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// Center places the container in the middle of its parent's width.
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Center bool
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// Fill takes the parent's whole content box.
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Fill bool
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// Clip cuts content that overflows the padding box.
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Clip bool
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}
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// Container pads its children, caps their width and can center, fill and clip.
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func Container(c *ui.Context, opts ContainerOptions, children func()) *ui.Element {
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if opts.MaxWidth < 0 {
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panic("mujica: Container MaxWidth must not be negative")
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}
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if children == nil {
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panic("mujica: Container needs children")
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}
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e := ui.Column(c).Padding(containerSpace(core.Density(c), opts.Padding, SpaceL))
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if opts.MaxWidth > 0 {
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e.MaxWidth(opts.MaxWidth)
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}
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if opts.Fill {
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e.Fill()
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}
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if opts.Center {
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e.FillWidth().Margin(0, ui.Auto)
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}
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if opts.Clip {
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e.Clip()
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}
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return e.Children(children)
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}
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