Add navigation components 131-150; pixel Pad, Finish, Park, Since

navigation/contextmenu.go

@@ -0,0 +1,81 @@
+package navigation
+
+import (
+	"log/slog"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type ContextMenuOptions struct {
+	Disabled bool
+}
+
+type ContextMenuResult struct {
+	Element *ui.Element
+	// Chosen is the item taken this frame, or -1.
+	Chosen int
+}
+
+type contextKey struct{}
+
+// spot is the menu and where it opened, in DIPs.
+type spot struct {
+	m    menu
+	x, y float32
+}
+
+// ContextMenu opens on right click or the menu key.
+func ContextMenu(c *ui.Context, text string, items []MenuItem, o ContextMenuOptions, content func()) ContextMenuResult {
+	k := pixel.K(c)
+	off := o.Disabled || pixel.Current(c).Inert
+	area := ui.Box(c).FocusRing(false).Role(ui.RoleGroup).Label(text)
+	// The area takes focus, so the menu key reaches it.
+	if off {
+		area.Description(k.Msg("disabled"))
+	} else {
+		area.Focusable()
+	}
+	s := ui.Local(area, contextKey{}, func() spot { return spot{m: menu{lit: -1}} })
+	pixel.Park(c, area, off)
+	if off {
+		s.m.open = false
+	}
+	res := ContextMenuResult{Element: area, Chosen: -1}
+	if area.RightClicked() && !off {
+		s.x, s.y, _ = area.PointerPosition()
+		s.m.show(items)
+	}
+	key, shiftF10 := area.Shortcut(0, ui.KeyContextMenu), area.Shortcut(ui.Shift, ui.KeyF10)
+	if (key || shiftF10) && !off {
+		// At the pointer when over the area, else its corner.
+		x, y, over := area.PointerPosition()
+		if !over {
+			x, y = 0, 0
+		}
+		s.x, s.y = x, y
+		s.m.show(items)
+	}
+	// Right clicks keep the focus, so the window takes keys.
+	res.Chosen = s.m.keys(c.Shortcut, items)
+	focus := area.FocusVisible()
+	area.DrawOver(func(p *ui.Painter, r ui.Rect) {
+		if focus {
+			g := k.Canvas(p, r)
+			g.FocusMark(0, 0, g.W, g.H)
+		}
+	}).Children(content)
+	panel, clicked := s.m.list(c, area, items)
+	if clicked >= 0 {
+		res.Chosen = clicked
+	}
+	if panel != nil {
+		b := area.Bounds()
+		panel.Left(b.X + s.x).Top(b.Y + s.y)
+	}
+	if res.Chosen >= 0 {
+		slog.Debug("8bit: context menu", "item", items[res.Chosen].Label)
+	}
+	return res
+}