all: initial import

Signed-off-by: Elias Naur <mail@eliasnaur.com>

ui/pointer/pointer.go

@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package pointer
+
+import (
+	"time"
+
+	"gioui.org/ui/f32"
+)
+
+type Event struct {
+	Type      Type
+	Source    Source
+	PointerID ID
+	Priority  Priority
+	Time      time.Duration
+	Hit       bool
+	Position  f32.Point
+	Scroll    f32.Point
+}
+
+type OpHandler struct {
+	Key  Key
+	Area Area
+	Grab bool
+}
+
+type Area func(pos f32.Point) HitResult
+
+type Key interface{}
+
+type Events interface {
+	For(k Key) []Event
+}
+
+type HitResult uint8
+
+const (
+	HitNone HitResult = iota
+	HitTransparent
+	HitOpaque
+)
+
+type ID uint16
+type Type uint8
+type Priority uint8
+type Source uint8
+
+const (
+	Cancel Type = iota
+	Press
+	Release
+	Move
+)
+
+const (
+	Mouse Source = iota
+	Touch
+)
+
+const (
+	Shared Priority = iota
+	Foremost
+	Grabbed
+)
+
+func (t Type) String() string {
+	switch t {
+	case Press:
+		return "Press"
+	case Release:
+		return "Release"
+	case Cancel:
+		return "Cancel"
+	case Move:
+		return "Move"
+	default:
+		panic("unknown Type")
+	}
+}
+
+func (p Priority) String() string {
+	switch p {
+	case Shared:
+		return "Shared"
+	case Foremost:
+		return "Foremost"
+	case Grabbed:
+		return "Grabbed"
+	default:
+		panic("unknown priority")
+	}
+}
+
+func (s Source) String() string {
+	switch s {
+	case Mouse:
+		return "Mouse"
+	case Touch:
+		return "Touch"
+	default:
+		panic("unknown source")
+	}
+}
+
+func (OpHandler) ImplementsOp() {}
+func (Event) ImplementsEvent()  {}