112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
package navigation
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import (
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"log/slog"
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"github.com/egoist/mygo/ui"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/input"
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"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
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)
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type Menu struct {
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Title string
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Items []MenuItem
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}
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type MenuBarOptions struct {
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Disabled bool
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}
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type MenuBarResult struct {
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Element *ui.Element
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// Menu and Item are this frame's choice, else -1.
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Menu, Item int
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}
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type barKey struct{}
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// bar is the open menu, its state and the pointer.
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type bar struct {
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open int
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m menu
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ptr [2]float32
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}
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// MenuBar is a bar of menus; arrows go across, down.
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func MenuBar(c *ui.Context, text string, menus []Menu, o MenuBarOptions) MenuBarResult {
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k := pixel.K(c)
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off := o.Disabled || pixel.Current(c).Inert
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row := ui.Row(c).Gap(k.D(2)).Padding(k.D(2), k.D(4)).AlignItems(ui.Center).FocusGroup(ui.Horizontal).Role(ui.RoleToolbar).Label(text)
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b := ui.Local(row, barKey{}, func() bar { return bar{open: -1} })
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res := MenuBarResult{Element: row, Menu: -1, Item: -1}
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open := func(i int) {
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b.open = i
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b.m.show(menus[i].Items)
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}
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if off && b.open >= 0 {
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// Closing on disable must not return focus to it.
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c.Root().Focus()
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b.open = -1
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}
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if b.open >= 0 && !b.m.open {
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b.open = -1
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}
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n := len(menus)
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// Left and Right hand an open menu to its neighbor.
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if b.open >= 0 {
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left, right := row.Shortcut(0, ui.KeyLeft), row.Shortcut(0, ui.KeyRight)
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switch {
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case left:
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open((b.open + n - 1) % n)
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case right:
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open((b.open + 1) % n)
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}
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}
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// Only a moving pointer hands the bar to another title.
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px, py, over := row.PointerPosition()
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moved := over && [2]float32{px, py} != b.ptr
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b.ptr = [2]float32{px, py}
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var anchor *ui.Element
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row.Draw(func(p *ui.Painter, r ui.Rect) {
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g := k.Canvas(p, r)
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g.Rect(0, 0, g.W, g.H, pixel.Face)
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g.HLine(0, g.H-1, g.W, pixel.Edge)
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}).Children(func() {
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for i, mn := range menus {
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t := input.Button(c, mn.Title, input.ButtonOptions{Variant: input.Ghost, Size: input.Small, Disabled: o.Disabled})
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if _, _, on := t.Element.PointerPosition(); on && moved && b.open >= 0 && i != b.open {
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open(i)
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}
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if i == b.open {
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anchor = t.Element
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}
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switch {
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case t.Clicked && b.open == i:
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b.open = -1
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case t.Clicked:
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open(i)
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anchor = t.Element
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case b.open < 0 && !off && t.Element.FocusWithin() && row.Shortcut(0, ui.KeyDown):
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open(i)
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anchor = t.Element
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}
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}
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})
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if b.open >= 0 && anchor != nil {
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items := menus[b.open].Items
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res.Item = b.m.keys(row.Shortcut, items)
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if _, clicked := b.m.list(c, anchor, items); clicked >= 0 {
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res.Item = clicked
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}
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if res.Item >= 0 {
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res.Menu = b.open
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b.open = -1
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}
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}
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if res.Item >= 0 {
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slog.Debug("8bit: menu bar", "menu", menus[res.Menu].Title, "item", menus[res.Menu].Items[res.Item].Label)
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}
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return res
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}
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