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

overlay/context_menu.go

@@ -0,0 +1,54 @@
+package overlay
+
+import (
+	"log/slog"
+
+	"github.com/egoist/mygo/ui"
+)
+
+// ContextMenuOptions configure a ContextMenu.
+type ContextMenuOptions struct {
+	Disabled bool
+}
+
+// contextMenuState is where the menu opened, relative to the target.
+type contextMenuState struct {
+	open bool
+	x, y float32
+}
+
+// ContextMenu gives the container target an in-window menu at the pointer or below the focus.
+func ContextMenu(c *ui.Context, target *ui.Element, opts ContextMenuOptions, build func(m *PopupMenu)) *ui.Element {
+	if target == nil {
+		panic("mujica: ContextMenu needs a target")
+	}
+	if build == nil {
+		panic("mujica: ContextMenu needs a build function")
+	}
+	st := ui.Local(target, "mujica.contextmenu", func() contextMenuState { return contextMenuState{} })
+	if opts.Disabled {
+		st.open = false
+		return target
+	}
+	target.HandleInput(func(ev ui.InputEvent) bool {
+		if ev.Kind != ui.InputPointerDown || ev.Button != 1 {
+			return false
+		}
+		st.open, st.x, st.y = true, ev.X, ev.Y
+		slog.Debug("mujica: context_menu open", "by", "pointer")
+		return true
+	})
+	if target.Shortcut(0, ui.KeyContextMenu) || target.Shortcut(ui.Shift, ui.KeyF10) {
+		st.open, st.x, st.y = true, 0, target.Bounds().H
+		slog.Debug("mujica: context_menu open", "by", "keyboard")
+	}
+	if !st.open {
+		return target
+	}
+	var anchor *ui.Element
+	target.Children(func() {
+		anchor = ui.Box(c).Key("mujica.contextmenu.anchor").Absolute().Left(st.x).Top(st.y).Size(1, 1).PassThrough()
+	})
+	PopupMenuOpen(c, anchor, &st.open, build)
+	return target
+}