io/key: [API] replace key.InputOp with a filter

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

app/internal/xkb/xkb_unix.go

@@ -238,17 +238,17 @@ func (x *Context) UpdateMask(depressed, latched, locked, depressedGroup, latched
 		C.xkb_layout_index_t(depressedGroup), C.xkb_layout_index_t(latchedGroup), C.xkb_layout_index_t(lockedGroup))
 }
 
-func convertKeysym(s C.xkb_keysym_t) (string, bool) {
+func convertKeysym(s C.xkb_keysym_t) (key.Name, bool) {
 	if 'a' <= s && s <= 'z' {
-		return string(rune(s - 'a' + 'A')), true
+		return key.Name(rune(s - 'a' + 'A')), true
 	}
 	if C.XKB_KEY_KP_0 <= s && s <= C.XKB_KEY_KP_9 {
-		return string(rune(s - C.XKB_KEY_KP_0 + '0')), true
+		return key.Name(rune(s - C.XKB_KEY_KP_0 + '0')), true
 	}
 	if ' ' < s && s <= '~' {
-		return string(rune(s)), true
+		return key.Name(rune(s)), true
 	}
-	var n string
+	var n key.Name
 	switch s {
 	case C.XKB_KEY_Escape:
 		n = key.NameEscape

app/os_android.go

@@ -899,8 +899,8 @@ func runInJVM(jvm *C.JavaVM, f func(env *C.JNIEnv)) {
 	f(env)
 }
 
-func convertKeyCode(code C.jint) (string, bool) {
-	var n string
+func convertKeyCode(code C.jint) (key.Name, bool) {
+	var n key.Name
 	switch code {
 	case C.AKEYCODE_FORWARD_DEL:
 		n = key.NameDeleteForward

app/os_ios.go

@@ -310,7 +310,7 @@ func (w *window) SetCursor(cursor pointer.Cursor) {
 	w.cursor = windowSetCursor(w.cursor, cursor)
 }
 
-func (w *window) onKeyCommand(name string) {
+func (w *window) onKeyCommand(name key.Name) {
 	w.w.Event(key.Event{
 		Name: name,
 	})

app/os_js.go

@@ -752,8 +752,8 @@ func osMain() {
 	select {}
 }
 
-func translateKey(k string) (string, bool) {
-	var n string
+func translateKey(k string) (key.Name, bool) {
+	var n key.Name
 
 	switch k {
 	case "ArrowUp":
@@ -820,7 +820,7 @@ func translateKey(k string) (string, bool) {
 		r, s := utf8.DecodeRuneInString(k)
 		// If there is exactly one printable character, return that.
 		if s == len(k) && unicode.IsPrint(r) {
-			return strings.ToUpper(k), true
+			return key.Name(strings.ToUpper(k)), true
 		}
 		return "", false
 	}

app/os_macos.go

@@ -920,8 +920,8 @@ func osMain() {
 	C.gio_main()
 }
 
-func convertKey(k rune) (string, bool) {
-	var n string
+func convertKey(k rune) (key.Name, bool) {
+	var n key.Name
 	switch k {
 	case 0x1b:
 		n = key.NameEscape
@@ -982,7 +982,7 @@ func convertKey(k rune) (string, bool) {
 		if !unicode.IsPrint(k) {
 			return "", false
 		}
-		n = string(k)
+		n = key.Name(k)
 	}
 	return n, true
 }

app/os_windows.go

@@ -870,11 +870,11 @@ func (w *window) raise() {
 		windows.SWP_NOMOVE|windows.SWP_NOSIZE|windows.SWP_SHOWWINDOW)
 }
 
-func convertKeyCode(code uintptr) (string, bool) {
+func convertKeyCode(code uintptr) (key.Name, bool) {
 	if '0' <= code && code <= '9' || 'A' <= code && code <= 'Z' {
-		return string(rune(code)), true
+		return key.Name(rune(code)), true
 	}
-	var r string
+	var r key.Name
 
 	switch code {
 	case windows.VK_ESCAPE:

app/window.go

@@ -903,11 +903,6 @@ func (w *Window) processEvent(d driver, e event.Event) bool {
 					handled = false
 				}
 			}
-			// As a special case, the top-most input handler receives all unhandled
-			// events.
-			if !handled {
-				handled = w.queue.QueueTopmost(e)
-			}
 		}
 		w.updateCursor(d)
 		if handled {

internal/ops/ops.go

@@ -63,7 +63,6 @@ const (
 	TypePass
 	TypePopPass
 	TypeInput
-	TypeKeyInput
 	TypeKeyInputHint
 	TypeSave
 	TypeLoad
@@ -140,7 +139,6 @@ const (
 	TypePassLen             = 1
 	TypePopPassLen          = 1
 	TypeInputLen            = 1
-	TypeKeyInputLen         = 1
 	TypeKeyInputHintLen     = 1 + 1
 	TypeSaveLen             = 1 + 4
 	TypeLoadLen             = 1 + 4
@@ -415,7 +413,6 @@ var opProps = [0x100]opProp{
 	TypePass:             {Size: TypePassLen, NumRefs: 0},
 	TypePopPass:          {Size: TypePopPassLen, NumRefs: 0},
 	TypeInput:            {Size: TypeInputLen, NumRefs: 1},
-	TypeKeyInput:         {Size: TypeKeyInputLen, NumRefs: 2},
 	TypeKeyInputHint:     {Size: TypeKeyInputHintLen, NumRefs: 1},
 	TypeSave:             {Size: TypeSaveLen, NumRefs: 0},
 	TypeLoad:             {Size: TypeLoadLen, NumRefs: 0},
@@ -478,8 +475,6 @@ func (t OpType) String() string {
 		return "PopPass"
 	case TypeInput:
 		return "Input"
-	case TypeKeyInput:
-		return "KeyInput"
 	case TypeKeyInputHint:
 		return "KeyInputHint"
 	case TypeSave:

io/input/key.go

@@ -39,10 +39,11 @@ type keyHandler struct {
 	visible   bool
 	new       bool
 	focusable bool
+	active    bool
 	hint      key.InputHint
 	order     int
 	dirOrder  int
-	filter    key.Set
+	filters   []key.Filter
 	trans     f32.Affine2D
 }
 
@@ -116,6 +117,7 @@ func (q *keyQueue) Frame(events *handlerEvents) {
 		h.new = false
 		h.visible = false
 		h.focusable = false
+		h.active = false
 	}
 	q.updateFocusLayout()
 }
@@ -255,7 +257,25 @@ func (q *keyQueue) AreaFor(t event.Tag) int {
 }
 
 func (q *keyQueue) Accepts(t event.Tag, e key.Event) bool {
-	return q.handlers[t].filter.Contains(e.Name, e.Modifiers)
+	for _, f := range q.handlers[t].filters {
+		if keyFilterMatch(f, e) {
+			return true
+		}
+	}
+	return false
+}
+
+func keyFilterMatch(f key.Filter, e key.Event) bool {
+	if f.Name != e.Name {
+		return false
+	}
+	if e.Modifiers&f.Required != f.Required {
+		return false
+	}
+	if e.Modifiers&^(f.Required|f.Optional) != 0 {
+		return false
+	}
+	return true
 }
 
 func (q *keyQueue) Focus(focus event.Tag, events *handlerEvents) {
@@ -288,6 +308,15 @@ func (q *keyQueue) softKeyboard(show bool) {
 	}
 }
 
+func (q *keyQueue) filter(tag event.Tag, f key.Filter) {
+	h := q.handlerFor(tag)
+	if !h.active {
+		h.active = true
+		h.filters = h.filters[:0]
+	}
+	h.filters = append(h.filters, f)
+}
+
 func (q *keyQueue) focusable(tag event.Tag) {
 	h := q.handlerFor(tag)
 	h.focusable = true
@@ -305,14 +334,13 @@ func (q *keyQueue) handlerFor(tag event.Tag) *keyHandler {
 	return h
 }
 
-func (q *keyQueue) inputOp(op key.InputOp, t f32.Affine2D, area int, bounds image.Rectangle) {
-	h := q.handlerFor(op.Tag)
+func (q *keyQueue) inputOp(tag event.Tag, t f32.Affine2D, area int, bounds image.Rectangle) {
+	h := q.handlerFor(tag)
 	if h.order == -1 {
 		h.order = len(q.order)
-		q.order = append(q.order, op.Tag)
-		q.dirOrder = append(q.dirOrder, dirFocusEntry{tag: op.Tag, area: area, bounds: bounds})
+		q.order = append(q.order, tag)
+		q.dirOrder = append(q.dirOrder, dirFocusEntry{tag: tag, area: area, bounds: bounds})
 	}
-	h.filter = op.Keys
 	h.visible = true
 	h.trans = t
 }

io/input/key_test.go

@@ -15,10 +15,10 @@ import (
 	"gioui.org/op/clip"
 )
 
-func TestKeyWakeup(t *testing.T) {
+func TestInputWakeup(t *testing.T) {
 	handler := new(int)
 	var ops op.Ops
-	key.InputOp{Tag: handler}.Add(&ops)
+	event.InputOp(&ops, handler)
 
 	var r Router
 	// Test that merely adding a handler doesn't trigger redraw.
@@ -39,12 +39,12 @@ func TestKeyMultiples(t *testing.T) {
 	r := new(Router)
 
 	r.Source().Queue(key.SoftKeyboardCmd{Show: true})
-	key.InputOp{Tag: &handlers[0]}.Add(ops)
+	event.InputOp(ops, &handlers[0])
 	r.Source().Queue(key.FocusCmd{Tag: &handlers[2]})
-	key.InputOp{Tag: &handlers[1]}.Add(ops)
+	event.InputOp(ops, &handlers[1])
 
 	// The last one must be focused:
-	key.InputOp{Tag: &handlers[2]}.Add(ops)
+	event.InputOp(ops, &handlers[2])
 
 	for i := range handlers {
 		r.Events(&handlers[i], key.FocusFilter{})
@@ -64,14 +64,14 @@ func TestKeyStacked(t *testing.T) {
 	ops := new(op.Ops)
 	r := new(Router)
 
-	key.InputOp{Tag: &handlers[0]}.Add(ops)
+	event.InputOp(ops, &handlers[0])
 	r.Source().Queue(key.FocusCmd{})
 	r.Source().Queue(key.SoftKeyboardCmd{Show: false})
-	key.InputOp{Tag: &handlers[1]}.Add(ops)
+	event.InputOp(ops, &handlers[1])
 	r.Source().Queue(key.FocusCmd{Tag: &handlers[1]})
-	key.InputOp{Tag: &handlers[2]}.Add(ops)
+	event.InputOp(ops, &handlers[2])
 	r.Source().Queue(key.SoftKeyboardCmd{Show: true})
-	key.InputOp{Tag: &handlers[3]}.Add(ops)
+	event.InputOp(ops, &handlers[3])
 
 	for i := range handlers {
 		r.Events(&handlers[i], key.FocusFilter{})
@@ -107,35 +107,39 @@ func TestKeyRemoveFocus(t *testing.T) {
 	r := new(Router)
 
 	// New InputOp with Focus and Keyboard:
-	key.InputOp{Tag: &handlers[0], Keys: "Short-Tab"}.Add(ops)
+	event.InputOp(ops, &handlers[0])
 	r.Source().Queue(key.FocusCmd{Tag: &handlers[0]})
 	r.Source().Queue(key.SoftKeyboardCmd{Show: true})
 
 	// New InputOp without any focus:
-	key.InputOp{Tag: &handlers[1], Keys: "Short-Tab"}.Add(ops)
+	event.InputOp(ops, &handlers[1])
 
+	filters := []event.Filter{
+		key.FocusFilter{},
+		key.Filter{Name: key.NameTab, Required: key.ModShortcut},
+	}
 	for i := range handlers {
-		r.Events(&handlers[i], key.FocusFilter{})
+		r.Events(&handlers[i], filters...)
 	}
 
 	r.Frame(ops)
 
 	// Add some key events:
-	event := event.Event(key.Event{Name: key.NameTab, Modifiers: key.ModShortcut, State: key.Press})
-	r.Queue(event)
+	evt := event.Event(key.Event{Name: key.NameTab, Modifiers: key.ModShortcut, State: key.Press})
+	r.Queue(evt)
 
-	assertKeyEvent(t, r.Events(&handlers[0], key.FocusFilter{}), true, event)
-	assertKeyEvent(t, r.Events(&handlers[1], key.FocusFilter{}), false)
+	assertKeyEvent(t, r.Events(&handlers[0], filters...), true, evt)
+	assertKeyEvent(t, r.Events(&handlers[1], filters...), false)
 	assertFocus(t, r, &handlers[0])
 	assertKeyboard(t, r, TextInputOpen)
 
 	ops.Reset()
 
 	// Will get the focus removed:
-	key.InputOp{Tag: &handlers[0]}.Add(ops)
+	event.InputOp(ops, &handlers[0])
 
 	// Unchanged:
-	key.InputOp{Tag: &handlers[1]}.Add(ops)
+	event.InputOp(ops, &handlers[1])
 
 	// Remove focus by focusing on a tag that don't exist.
 	r.Source().Queue(key.FocusCmd{Tag: new(int)})
@@ -148,9 +152,8 @@ func TestKeyRemoveFocus(t *testing.T) {
 
 	ops.Reset()
 
-	key.InputOp{Tag: &handlers[0]}.Add(ops)
-
-	key.InputOp{Tag: &handlers[1]}.Add(ops)
+	event.InputOp(ops, &handlers[0])
+	event.InputOp(ops, &handlers[1])
 
 	r.Frame(ops)
 
@@ -164,11 +167,11 @@ func TestKeyRemoveFocus(t *testing.T) {
 	// Set focus to InputOp which already
 	// exists in the previous frame:
 	r.Source().Queue(key.FocusCmd{Tag: &handlers[0]})
-	key.InputOp{Tag: &handlers[0]}.Add(ops)
+	event.InputOp(ops, &handlers[0])
 	r.Source().Queue(key.SoftKeyboardCmd{Show: true})
 
 	// Remove focus.
-	key.InputOp{Tag: &handlers[1]}.Add(ops)
+	event.InputOp(ops, &handlers[1])
 	r.Source().Queue(key.FocusCmd{})
 
 	r.Frame(ops)
@@ -185,11 +188,11 @@ func TestKeyFocusedInvisible(t *testing.T) {
 
 	// Set new InputOp with focus:
 	r.Source().Queue(key.FocusCmd{Tag: &handlers[0]})
-	key.InputOp{Tag: &handlers[0]}.Add(ops)
+	event.InputOp(ops, &handlers[0])
 	r.Source().Queue(key.SoftKeyboardCmd{Show: true})
 
 	// Set new InputOp without focus:
-	key.InputOp{Tag: &handlers[1]}.Add(ops)
+	event.InputOp(ops, &handlers[1])
 
 	for i := range handlers {
 		r.Events(&handlers[i], key.FocusFilter{})
@@ -209,7 +212,7 @@ func TestKeyFocusedInvisible(t *testing.T) {
 	//
 
 	// Unchanged:
-	key.InputOp{Tag: &handlers[1]}.Add(ops)
+	event.InputOp(ops, &handlers[1])
 
 	r.Frame(ops)
 
@@ -221,7 +224,7 @@ func TestKeyFocusedInvisible(t *testing.T) {
 	r.Frame(ops)
 
 	// Unchanged
-	key.InputOp{Tag: &handlers[1]}.Add(ops)
+	event.InputOp(ops, &handlers[1])
 
 	r.Frame(ops)
 
@@ -229,10 +232,10 @@ func TestKeyFocusedInvisible(t *testing.T) {
 
 	// Respawn the first element:
 	// It must receive one `Event{Focus: false}`.
-	key.InputOp{Tag: &handlers[0]}.Add(ops)
+	event.InputOp(ops, &handlers[0])
 
 	// Unchanged
-	key.InputOp{Tag: &handlers[1]}.Add(ops)
+	event.InputOp(ops, &handlers[1])
 
 	for i := range handlers {
 		r.Events(&handlers[i], key.FocusFilter{})
@@ -263,7 +266,7 @@ func TestDirectionalFocus(t *testing.T) {
 
 	for i, bounds := range handlers {
 		cl := clip.Rect(bounds).Push(ops)
-		key.InputOp{Tag: &handlers[i]}.Add(ops)
+		event.InputOp(ops, &handlers[i])
 		cl.Pop()
 		r.Events(&handlers[i], key.FocusFilter{})
 	}
@@ -307,7 +310,6 @@ func TestFocusScroll(t *testing.T) {
 	r.Events(h, filters...)
 	parent := clip.Rect(image.Rect(1, 1, 14, 39)).Push(ops)
 	cl := clip.Rect(image.Rect(10, -20, 20, 30)).Push(ops)
-	key.InputOp{Tag: h}.Add(ops)
 	event.InputOp(ops, h)
 	// Test that h is scrolled even if behind another handler.
 	event.InputOp(ops, new(int))
@@ -334,7 +336,6 @@ func TestFocusClick(t *testing.T) {
 	}
 	assertEventPointerTypeSequence(t, r.Events(h, filters...), pointer.Cancel)
 	cl := clip.Rect(image.Rect(0, 0, 10, 10)).Push(ops)
-	key.InputOp{Tag: h}.Add(ops)
 	event.InputOp(ops, h)
 	cl.Pop()
 	r.Frame(ops)
@@ -359,21 +360,31 @@ func TestKeyRouting(t *testing.T) {
 	rect := clip.Rect{Max: image.Pt(10, 10)}
 
 	macro := op.Record(macroOps)
-	key.InputOp{Tag: &handlers[0], Keys: "A"}.Add(ops)
+	event.InputOp(ops, &handlers[0])
 	cl1 := rect.Push(ops)
-	key.InputOp{Tag: &handlers[1], Keys: "B"}.Add(ops)
-	key.InputOp{Tag: &handlers[2], Keys: "A"}.Add(ops)
+	event.InputOp(ops, &handlers[1])
+	event.InputOp(ops, &handlers[2])
 	cl1.Pop()
 	cl2 := rect.Push(ops)
-	key.InputOp{Tag: &handlers[3]}.Add(ops)
-	key.InputOp{Tag: &handlers[4], Keys: "A"}.Add(ops)
+	event.InputOp(ops, &handlers[3])
+	event.InputOp(ops, &handlers[4])
 	cl2.Pop()
 	call := macro.Stop()
 	call.Add(ops)
 
-	for i := range handlers {
-		r.Events(&handlers[i], key.FocusFilter{})
+	fa := []event.Filter{
+		key.FocusFilter{},
+		key.Filter{Name: "A"},
 	}
+	fb := []event.Filter{
+		key.FocusFilter{},
+		key.Filter{Name: "B"},
+	}
+	r.Events(&handlers[0], fa...)
+	r.Events(&handlers[1], fb...)
+	r.Events(&handlers[2], fa...)
+	r.Events(&handlers[3], key.FocusFilter{})
+	r.Events(&handlers[4], fa...)
 
 	r.Frame(ops)
 
@@ -382,17 +393,19 @@ func TestKeyRouting(t *testing.T) {
 
 	// With no focus, the events should traverse the final branch of the hit tree
 	// searching for handlers.
-	assertKeyEvent(t, r.Events(&handlers[4], key.FocusFilter{}), false, A)
+	assertKeyEvent(t, r.Events(&handlers[4], fa...), false, A)
 	assertKeyEvent(t, r.Events(&handlers[3], key.FocusFilter{}), false)
-	assertKeyEvent(t, r.Events(&handlers[2], key.FocusFilter{}), false)
-	assertKeyEvent(t, r.Events(&handlers[1], key.FocusFilter{}), false, B)
-	assertKeyEvent(t, r.Events(&handlers[0], key.FocusFilter{}), false)
+	assertKeyEvent(t, r.Events(&handlers[2], fa...), false)
+	assertKeyEvent(t, r.Events(&handlers[1], fb...), false, B)
+	assertKeyEvent(t, r.Events(&handlers[0], fa...), false)
 
 	r2 := new(Router)
 
-	for i := range handlers {
-		r2.Events(&handlers[i], key.FocusFilter{})
-	}
+	r2.Events(&handlers[0], fa...)
+	r2.Events(&handlers[1], fb...)
+	r2.Events(&handlers[2], fa...)
+	r2.Events(&handlers[3], key.FocusFilter{})
+	r2.Events(&handlers[4], fa...)
 
 	r2.Source().Queue(key.FocusCmd{Tag: &handlers[3]})
 	r2.Frame(ops)
@@ -401,11 +414,11 @@ func TestKeyRouting(t *testing.T) {
 
 	// With focus, the events should traverse the branch of the hit tree
 	// containing the focused element.
-	assertKeyEvent(t, r2.Events(&handlers[4], key.FocusFilter{}), false)
+	assertKeyEvent(t, r2.Events(&handlers[4], fa...), false)
 	assertKeyEvent(t, r2.Events(&handlers[3], key.FocusFilter{}), true)
-	assertKeyEvent(t, r2.Events(&handlers[2], key.FocusFilter{}), false)
-	assertKeyEvent(t, r2.Events(&handlers[1], key.FocusFilter{}), false)
-	assertKeyEvent(t, r2.Events(&handlers[0], key.FocusFilter{}), false, A)
+	assertKeyEvent(t, r2.Events(&handlers[2], fa...), false)
+	assertKeyEvent(t, r2.Events(&handlers[1], fb...), false)
+	assertKeyEvent(t, r2.Events(&handlers[0], fa...), false, A)
 }
 
 func assertKeyEvent(t *testing.T, events []event.Event, expectedFocus bool, expectedInputs ...event.Event) {

io/input/pointer.go

@@ -10,7 +10,6 @@ import (
 	f32internal "gioui.org/internal/f32"
 	"gioui.org/internal/ops"
 	"gioui.org/io/event"
-	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/semantic"
 	"gioui.org/io/system"
@@ -43,7 +42,6 @@ type hitNode struct {
 
 	// For handler nodes.
 	tag  event.Tag
-	ktag event.Tag
 	pass bool
 }
 
@@ -262,15 +260,6 @@ func (q *pointerQueue) handlerFor(tag event.Tag, events *handlerEvents) *pointer
 	return h
 }
 
-func (c *pointerCollector) keyInputOp(op key.InputOp) {
-	areaID := c.currentArea()
-	c.addHitNode(hitNode{
-		area: areaID,
-		ktag: op.Tag,
-		pass: true,
-	})
-}
-
 func (c *pointerCollector) actionInputOp(act system.Action) {
 	areaID := c.currentArea()
 	area := &c.q.areas[areaID]

io/input/pointer_test.go

@@ -1008,7 +1008,7 @@ func TestDeferredInputOp(t *testing.T) {
 
 	var r Router
 	m := op.Record(&ops)
-	key.InputOp{Tag: new(int)}.Add(&ops)
+	event.InputOp(&ops, new(int))
 	call := m.Stop()
 
 	op.Defer(&ops, call)

io/input/router.go

@@ -131,6 +131,8 @@ func (s Source) Events(k event.Tag, filters ...event.Filter) []event.Event {
 func (q *Router) Events(k event.Tag, filters ...event.Filter) []event.Event {
 	for _, f := range filters {
 		switch f := f.(type) {
+		case key.Filter:
+			q.key.queue.filter(k, f)
 		case key.FocusFilter:
 			q.key.queue.focusable(k)
 		case pointer.Filter:
@@ -167,25 +169,6 @@ func (q *Router) Frame(frame *op.Ops) {
 	}
 }
 
-// Queue key events to the topmost handler.
-func (q *Router) QueueTopmost(events ...key.Event) bool {
-	var topmost event.Tag
-	pq := &q.pointer.queue
-	for _, h := range pq.hitTree {
-		if h.ktag != nil {
-			topmost = h.ktag
-			break
-		}
-	}
-	if topmost == nil {
-		return false
-	}
-	for _, e := range events {
-		q.handlers.Add(topmost, e)
-	}
-	return q.handlers.HadEvents()
-}
-
 // Queue events and report whether at least one handler had an event queued.
 func (q *Router) Queue(events ...event.Event) bool {
 	for _, e := range events {
@@ -273,7 +256,7 @@ func (q *Router) queueKeyEvent(e key.Event) {
 	if focused {
 		// If there is a focused tag, traverse its ancestry through the
 		// hit tree to search for handlers.
-		for ; pq.hitTree[idx].ktag != f; idx-- {
+		for ; pq.hitTree[idx].tag != f; idx-- {
 		}
 	}
 	for idx != -1 {
@@ -283,11 +266,11 @@ func (q *Router) queueKeyEvent(e key.Event) {
 		} else {
 			idx--
 		}
-		if n.ktag == nil {
+		if n.tag == nil {
 			continue
 		}
-		if kq.Accepts(n.ktag, e) {
-			q.handlers.Add(n.ktag, e)
+		if kq.Accepts(n.tag, e) {
+			q.handlers.Add(n.tag, e)
 			break
 		}
 	}
@@ -479,6 +462,9 @@ func (q *Router) collect() {
 		case ops.TypeInput:
 			tag := encOp.Refs[0].(event.Tag)
 			pc.inputOp(tag, &q.handlers)
+			a := pc.currentArea()
+			b := pc.currentAreaBounds()
+			kq.inputOp(tag, t, a, b)
 
 		// Pointer ops.
 		case ops.TypePass:
@@ -491,17 +477,6 @@ func (q *Router) collect() {
 		case ops.TypeActionInput:
 			act := system.Action(encOp.Data[1])
 			pc.actionInputOp(act)
-
-		case ops.TypeKeyInput:
-			filter := key.Set(*encOp.Refs[1].(*string))
-			op := key.InputOp{
-				Tag:  encOp.Refs[0].(event.Tag),
-				Keys: filter,
-			}
-			a := pc.currentArea()
-			b := pc.currentAreaBounds()
-			pc.keyInputOp(op)
-			kq.inputOp(op, t, a, b)
 		case ops.TypeKeyInputHint:
 			op := key.InputHintOp{
 				Tag:  encOp.Refs[0].(event.Tag),
@@ -583,6 +558,14 @@ func (h *handlerEvents) Events(k event.Tag, filters ...event.Filter) []event.Eve
 
 func filtersMatches(filters []event.Filter, e event.Event) bool {
 	switch e := e.(type) {
+	case key.Event:
+		for _, f := range filters {
+			if f, ok := f.(key.Filter); ok {
+				if keyFilterMatch(f, e) {
+					return true
+				}
+			}
+		}
 	case key.FocusEvent, key.SnippetEvent, key.EditEvent, key.SelectionEvent:
 		for _, f := range filters {
 			if _, ok := f.(key.FocusFilter); ok {
@@ -614,8 +597,6 @@ func filtersMatches(filters []event.Filter, e event.Event) bool {
 				return true
 			}
 		}
-	default:
-		return true
 	}
 	return false
 }

io/key/key.go

@@ -18,16 +18,15 @@ import (
 	"gioui.org/op"
 )
 
-// InputOp declares a handler ready for key events.
-// Key events are in general only delivered to the
-// focused key handler.
-type InputOp struct {
-	Tag event.Tag
-	// Keys is the set of keys Tag can handle. That is, Tag will only
-	// receive an Event if its key and modifiers are accepted by Keys.Contains.
-	// As a special case, the topmost (first added) InputOp handler receives all
-	// unhandled events.
-	Keys Set
+// Filter matches [Event]s.
+type Filter struct {
+	// Required is the set of modifiers that must be included in events matched.
+	Required Modifiers
+	// Optional is the set of modifiers that may be included in events matched.
+	Optional Modifiers
+	// Name of the key to be matched. As a special case, the empty
+	// Name matches every key not matched by any other filter.
+	Name Name
 }
 
 // InputHintOp describes the type of text expected by a tag.
@@ -54,22 +53,6 @@ type SnippetCmd struct {
 	Snippet
 }
 
-// Set is an expression that describes a set of key combinations, in the form
-// "<modifiers>-<keyset>|...".  Modifiers are separated by dashes, optional
-// modifiers are enclosed by parentheses.  A key set is either a literal key
-// name or a list of key names separated by commas and enclosed in brackets.
-//
-// The "Short" modifier matches the shortcut modifier (ModShortcut) and
-// "ShortAlt" matches the alternative modifier (ModShortcutAlt).
-//
-// Examples:
-//
-//   - A|B matches the A and B keys
-//   - [A,B] also matches the A and B keys
-//   - Shift-A matches A key if shift is pressed, and no other modifier.
-//   - Shift-(Ctrl)-A matches A if shift is pressed, and optionally ctrl.
-type Set string
-
 // Range represents a range of text, such as an editor's selection.
 // Start and End are in runes.
 type Range struct {
@@ -110,11 +93,8 @@ type FocusEvent struct {
 // An Event is generated when a key is pressed. For text input
 // use EditEvent.
 type Event struct {
-	// Name of the key. For letters, the upper case form is used, via
-	// unicode.ToUpper. The shift modifier is taken into account, all other
-	// modifiers are ignored. For example, the "shift-1" and "ctrl-shift-1"
-	// combinations both give the Name "!" with the US keyboard layout.
-	Name string
+	// Name of the key.
+	Name Name
 	// Modifiers is the set of active modifiers when the key was pressed.
 	Modifiers Modifiers
 	// State is the state of the key when the event was fired.
@@ -184,41 +164,49 @@ const (
 	ModSuper
 )
 
+// Name is the identifier for a keyboard key.
+//
+// For letters, the upper case form is used, via unicode.ToUpper.
+// The shift modifier is taken into account, all other
+// modifiers are ignored. For example, the "shift-1" and "ctrl-shift-1"
+// combinations both give the Name "!" with the US keyboard layout.
+type Name string
+
 const (
 	// Names for special keys.
-	NameLeftArrow      = "←"
-	NameRightArrow     = "→"
-	NameUpArrow        = "↑"
-	NameDownArrow      = "↓"
-	NameReturn         = "⏎"
-	NameEnter          = "⌤"
-	NameEscape         = "⎋"
-	NameHome           = "⇱"
-	NameEnd            = "⇲"
-	NameDeleteBackward = "⌫"
-	NameDeleteForward  = "⌦"
-	NamePageUp         = "⇞"
-	NamePageDown       = "⇟"
-	NameTab            = "Tab"
-	NameSpace          = "Space"
-	NameCtrl           = "Ctrl"
-	NameShift          = "Shift"
-	NameAlt            = "Alt"
-	NameSuper          = "Super"
-	NameCommand        = "⌘"
-	NameF1             = "F1"
-	NameF2             = "F2"
-	NameF3             = "F3"
-	NameF4             = "F4"
-	NameF5             = "F5"
-	NameF6             = "F6"
-	NameF7             = "F7"
-	NameF8             = "F8"
-	NameF9             = "F9"
-	NameF10            = "F10"
-	NameF11            = "F11"
-	NameF12            = "F12"
-	NameBack           = "Back"
+	NameLeftArrow      Name = "←"
+	NameRightArrow     Name = "→"
+	NameUpArrow        Name = "↑"
+	NameDownArrow      Name = "↓"
+	NameReturn         Name = "⏎"
+	NameEnter          Name = "⌤"
+	NameEscape         Name = "⎋"
+	NameHome           Name = "⇱"
+	NameEnd            Name = "⇲"
+	NameDeleteBackward Name = "⌫"
+	NameDeleteForward  Name = "⌦"
+	NamePageUp         Name = "⇞"
+	NamePageDown       Name = "⇟"
+	NameTab            Name = "Tab"
+	NameSpace          Name = "Space"
+	NameCtrl           Name = "Ctrl"
+	NameShift          Name = "Shift"
+	NameAlt            Name = "Alt"
+	NameSuper          Name = "Super"
+	NameCommand        Name = "⌘"
+	NameF1             Name = "F1"
+	NameF2             Name = "F2"
+	NameF3             Name = "F3"
+	NameF4             Name = "F4"
+	NameF5             Name = "F5"
+	NameF6             Name = "F6"
+	NameF7             Name = "F7"
+	NameF8             Name = "F8"
+	NameF9             Name = "F9"
+	NameF10            Name = "F10"
+	NameF11            Name = "F11"
+	NameF12            Name = "F12"
+	NameBack           Name = "Back"
 )
 
 type FocusDirection int
@@ -241,105 +229,10 @@ func (m Modifiers) Contain(m2 Modifiers) bool {
 // FocusCmd requests to set or clear the keyboard focus.
 type FocusCmd struct {
 	// Tag is the new focus. The focus is cleared if Tag is nil, or if Tag
-	// has no InputOp in the same frame.
+	// has no [event.Op] references.
 	Tag event.Tag
 }
 
-func (k Set) Contains(name string, mods Modifiers) bool {
-	ks := string(k)
-	for len(ks) > 0 {
-		// Cut next key expression.
-		chord, rest, _ := cut(ks, "|")
-		ks = rest
-		// Separate key set and modifier set.
-		var modSet, keySet string
-		sep := strings.LastIndex(chord, "-")
-		if sep != -1 {
-			modSet, keySet = chord[:sep], chord[sep+1:]
-		} else {
-			modSet, keySet = "", chord
-		}
-		if !keySetContains(keySet, name) {
-			continue
-		}
-		if modSetContains(modSet, mods) {
-			return true
-		}
-	}
-	return false
-}
-
-func keySetContains(keySet, name string) bool {
-	// Check for single key match.
-	if keySet == name {
-		return true
-	}
-	// Check for set match.
-	if len(keySet) < 2 || keySet[0] != '[' || keySet[len(keySet)-1] != ']' {
-		return false
-	}
-	keySet = keySet[1 : len(keySet)-1]
-	for len(keySet) > 0 {
-		key, rest, _ := cut(keySet, ",")
-		keySet = rest
-		if key == name {
-			return true
-		}
-	}
-	return false
-}
-
-func modSetContains(modSet string, mods Modifiers) bool {
-	var smods Modifiers
-	for len(modSet) > 0 {
-		mod, rest, _ := cut(modSet, "-")
-		modSet = rest
-		if len(mod) >= 2 && mod[0] == '(' && mod[len(mod)-1] == ')' {
-			mods &^= modFor(mod[1 : len(mod)-1])
-		} else {
-			smods |= modFor(mod)
-		}
-	}
-	return mods == smods
-}
-
-// cut is a copy of the standard library strings.Cut.
-// TODO: remove when Go 1.18 is our minimum.
-func cut(s, sep string) (before, after string, found bool) {
-	if i := strings.Index(s, sep); i >= 0 {
-		return s[:i], s[i+len(sep):], true
-	}
-	return s, "", false
-}
-
-func modFor(name string) Modifiers {
-	switch name {
-	case NameCtrl:
-		return ModCtrl
-	case NameShift:
-		return ModShift
-	case NameAlt:
-		return ModAlt
-	case NameSuper:
-		return ModSuper
-	case NameCommand:
-		return ModCommand
-	case "Short":
-		return ModShortcut
-	case "ShortAlt":
-		return ModShortcutAlt
-	}
-	return 0
-}
-
-func (h InputOp) Add(o *op.Ops) {
-	if h.Tag == nil {
-		panic("Tag must be non-nil")
-	}
-	data := ops.Write2String(&o.Internal, ops.TypeKeyInputLen, h.Tag, string(h.Keys))
-	data[0] = byte(ops.TypeKeyInput)
-}
-
 func (h InputHintOp) Add(o *op.Ops) {
 	if h.Tag == nil {
 		panic("Tag must be non-nil")
@@ -360,24 +253,25 @@ func (SoftKeyboardCmd) ImplementsCommand() {}
 func (SelectionCmd) ImplementsCommand()    {}
 func (SnippetCmd) ImplementsCommand()      {}
 
+func (Filter) ImplementsFilter()      {}
 func (FocusFilter) ImplementsFilter() {}
 
 func (m Modifiers) String() string {
 	var strs []string
 	if m.Contain(ModCtrl) {
-		strs = append(strs, NameCtrl)
+		strs = append(strs, string(NameCtrl))
 	}
 	if m.Contain(ModCommand) {
-		strs = append(strs, NameCommand)
+		strs = append(strs, string(NameCommand))
 	}
 	if m.Contain(ModShift) {
-		strs = append(strs, NameShift)
+		strs = append(strs, string(NameShift))
 	}
 	if m.Contain(ModAlt) {
-		strs = append(strs, NameAlt)
+		strs = append(strs, string(NameAlt))
 	}
 	if m.Contain(ModSuper) {
-		strs = append(strs, NameSuper)
+		strs = append(strs, string(NameSuper))
 	}
 	return strings.Join(strs, "-")
 }

io/key/key_test.go

@@ -1,35 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package key
-
-import (
-	"testing"
-)
-
-func TestKeySet(t *testing.T) {
-	const allMods = ModAlt | ModShift | ModSuper | ModCtrl | ModCommand
-	tests := []struct {
-		Set        Set
-		Matches    []Event
-		Mismatches []Event
-	}{
-		{"A", []Event{{Name: "A"}}, []Event{{Name: "A", Modifiers: ModShift}}},
-		{"[A,B,C]", []Event{{Name: "A"}, {Name: "B"}}, []Event{}},
-		{"Short-A", []Event{{Name: "A", Modifiers: ModShortcut}}, []Event{{Name: "A", Modifiers: ModShift}}},
-		{"(Ctrl)-A", []Event{{Name: "A", Modifiers: ModCtrl}, {Name: "A"}}, []Event{{Name: "A", Modifiers: ModShift}}},
-		{"Shift-[A,B,C]", []Event{{Name: "A", Modifiers: ModShift}}, []Event{{Name: "B", Modifiers: ModShift | ModCtrl}}},
-		{Set(allMods.String() + "-A"), []Event{{Name: "A", Modifiers: allMods}}, []Event{}},
-	}
-	for _, tst := range tests {
-		for _, e := range tst.Matches {
-			if !tst.Set.Contains(e.Name, e.Modifiers) {
-				t.Errorf("key set %q didn't contain %+v", tst.Set, e)
-			}
-		}
-		for _, e := range tst.Mismatches {
-			if tst.Set.Contains(e.Name, e.Modifiers) {
-				t.Errorf("key set %q contains %+v", tst.Set, e)
-			}
-		}
-	}
-}

widget/button.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"gioui.org/gesture"
+	"gioui.org/io/event"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/semantic"
@@ -25,7 +26,7 @@ type Clickable struct {
 	keyTag        struct{}
 	requestClicks int
 	focused       bool
-	pressedKey    string
+	pressedKey    key.Name
 }
 
 // Click represents a click.
@@ -102,13 +103,7 @@ func (b *Clickable) Layout(gtx layout.Context, w layout.Widget) layout.Dimension
 	defer clip.Rect(image.Rectangle{Max: dims.Size}).Push(gtx.Ops).Pop()
 	semantic.EnabledOp(gtx.Enabled()).Add(gtx.Ops)
 	b.click.Add(gtx.Ops)
-	if gtx.Enabled() {
-		keys := key.Set("⏎|Space")
-		if !b.focused {
-			keys = ""
-		}
-		key.InputOp{Tag: &b.keyTag, Keys: keys}.Add(gtx.Ops)
-	}
+	event.InputOp(gtx.Ops, &b.keyTag)
 	c.Add(gtx.Ops)
 	return dims
 }
@@ -162,7 +157,13 @@ func (b *Clickable) Update(gtx layout.Context) []Click {
 			})
 		}
 	}
-	for _, e := range gtx.Events(&b.keyTag, key.FocusFilter{}) {
+	filters := []event.Filter{
+		key.FocusFilter{},
+	}
+	if b.focused {
+		filters = append(filters, key.Filter{Name: key.NameReturn}, key.Filter{Name: key.NameSpace})
+	}
+	for _, e := range gtx.Events(&b.keyTag, filters...) {
 		switch e := e.(type) {
 		case key.FocusEvent:
 			b.focused = e.Focus

widget/editor.go

@@ -330,9 +330,57 @@ func (e *Editor) processKey(gtx layout.Context) {
 	if e.text.Changed() {
 		e.events = append(e.events, ChangeEvent{})
 	}
+	filters := []event.Filter{key.FocusFilter{}, transfer.TargetFilter{Type: "application/text"}}
+	if e.focused {
+		filters = append(filters,
+			key.Filter{Name: key.NameEnter, Optional: key.ModShift},
+			key.Filter{Name: key.NameReturn, Optional: key.ModShift},
+
+			key.Filter{Name: "Z", Required: key.ModShortcut, Optional: key.ModShift},
+			key.Filter{Name: "C", Required: key.ModShortcut},
+			key.Filter{Name: "V", Required: key.ModShortcut},
+			key.Filter{Name: "X", Required: key.ModShortcut},
+			key.Filter{Name: "A", Required: key.ModShortcut},
+
+			key.Filter{Name: key.NameDeleteBackward, Optional: key.ModShortcutAlt | key.ModShift},
+			key.Filter{Name: key.NameDeleteForward, Optional: key.ModShortcutAlt | key.ModShift},
+
+			key.Filter{Name: key.NameHome, Optional: key.ModShift},
+			key.Filter{Name: key.NameEnd, Optional: key.ModShift},
+			key.Filter{Name: key.NamePageDown, Optional: key.ModShift},
+			key.Filter{Name: key.NamePageUp, Optional: key.ModShift},
+		)
+		caret, _ := e.text.Selection()
+		if caret > 0 {
+			if gtx.Locale.Direction.Progression() == system.FromOrigin {
+				filters = append(filters,
+					key.Filter{Name: key.NameLeftArrow, Optional: key.ModShortcutAlt | key.ModShift},
+					key.Filter{Name: key.NameUpArrow, Optional: key.ModShortcutAlt | key.ModShift},
+				)
+			} else {
+				filters = append(filters,
+					key.Filter{Name: key.NameRightArrow, Optional: key.ModShortcutAlt | key.ModShift},
+					key.Filter{Name: key.NameDownArrow, Optional: key.ModShortcutAlt | key.ModShift},
+				)
+			}
+		}
+		if caret < e.text.Len() {
+			if gtx.Locale.Direction.Progression() == system.FromOrigin {
+				filters = append(filters,
+					key.Filter{Name: key.NameRightArrow, Optional: key.ModShortcutAlt | key.ModShift},
+					key.Filter{Name: key.NameDownArrow, Optional: key.ModShortcutAlt | key.ModShift},
+				)
+			} else {
+				filters = append(filters,
+					key.Filter{Name: key.NameLeftArrow, Optional: key.ModShortcutAlt | key.ModShift},
+					key.Filter{Name: key.NameUpArrow, Optional: key.ModShortcutAlt | key.ModShift},
+				)
+			}
+		}
+	}
 	// adjust keeps track of runes dropped because of MaxLen.
 	var adjust int
-	for _, ke := range gtx.Events(&e.eventKey, transfer.TargetFilter{Type: "application/text"}, key.FocusFilter{}) {
+	for _, ke := range gtx.Events(&e.eventKey, filters...) {
 		e.blinkStart = gtx.Now
 		switch ke := ke.(type) {
 		case key.FocusEvent:
@@ -625,33 +673,7 @@ func (e *Editor) layout(gtx layout.Context, textMaterial, selectMaterial op.Call
 
 	defer clip.Rect(image.Rectangle{Max: visibleDims.Size}).Push(gtx.Ops).Pop()
 	pointer.CursorText.Add(gtx.Ops)
-	var keys key.Set
-	if e.focused {
-		const keyFilterNoLeftUp = "(ShortAlt)-(Shift)-[→,↓]|(Shift)-[⏎,⌤]|(ShortAlt)-(Shift)-[⌫,⌦]|(Shift)-[⇞,⇟,⇱,⇲]|Short-[C,V,X,A]|Short-(Shift)-Z"
-		const keyFilterNoRightDown = "(ShortAlt)-(Shift)-[←,↑]|(Shift)-[⏎,⌤]|(ShortAlt)-(Shift)-[⌫,⌦]|(Shift)-[⇞,⇟,⇱,⇲]|Short-[C,V,X,A]|Short-(Shift)-Z"
-		const keyFilterNoArrows = "(Shift)-[⏎,⌤]|(ShortAlt)-(Shift)-[⌫,⌦]|(Shift)-[⇞,⇟,⇱,⇲]|Short-[C,V,X,A]|Short-(Shift)-Z"
-		const keyFilterAllArrows = "(ShortAlt)-(Shift)-[←,→,↑,↓]|(Shift)-[⏎,⌤]|(ShortAlt)-(Shift)-[⌫,⌦]|(Shift)-[⇞,⇟,⇱,⇲]|Short-[C,V,X,A]|Short-(Shift)-Z"
-		caret, _ := e.text.Selection()
-		switch {
-		case caret == 0 && caret == e.text.Len():
-			keys = keyFilterNoArrows
-		case caret == 0:
-			if gtx.Locale.Direction.Progression() == system.FromOrigin {
-				keys = keyFilterNoLeftUp
-			} else {
-				keys = keyFilterNoRightDown
-			}
-		case caret == e.text.Len():
-			if gtx.Locale.Direction.Progression() == system.FromOrigin {
-				keys = keyFilterNoRightDown
-			} else {
-				keys = keyFilterNoLeftUp
-			}
-		default:
-			keys = keyFilterAllArrows
-		}
-	}
-	key.InputOp{Tag: &e.eventKey, Keys: keys}.Add(gtx.Ops)
+	event.InputOp(gtx.Ops, &e.eventKey)
 	key.InputHintOp{Tag: &e.eventKey, Hint: e.InputHint}.Add(gtx.Ops)
 
 	e.scroller.Add(gtx.Ops)

widget/editor_test.go

@@ -124,6 +124,9 @@ func TestEditorReadOnly(t *testing.T) {
 	gtx.Ops.Reset()
 	layoutEditor()
 	r.Frame(gtx.Ops)
+	gtx.Ops.Reset()
+	layoutEditor()
+	r.Frame(gtx.Ops)
 
 	// Select everything.
 	gtx.Ops.Reset()
@@ -1005,8 +1008,11 @@ func TestSelectMove(t *testing.T) {
 	gtx.Ops.Reset()
 	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
 	r.Frame(gtx.Ops)
+	gtx.Ops.Reset()
+	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
+	r.Frame(gtx.Ops)
 
-	for _, keyName := range []string{key.NameLeftArrow, key.NameRightArrow, key.NameUpArrow, key.NameDownArrow} {
+	for _, keyName := range []key.Name{key.NameLeftArrow, key.NameRightArrow, key.NameUpArrow, key.NameDownArrow} {
 		// Select 345
 		e.SetCaret(3, 6)
 		if expected, got := "345", e.SelectedText(); expected != got {

widget/enum.go

@@ -4,6 +4,7 @@ package widget
 
 import (
 	"gioui.org/gesture"
+	"gioui.org/io/event"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/semantic"
@@ -59,7 +60,13 @@ func (e *Enum) Update(gtx layout.Context) bool {
 				}
 			}
 		}
-		for _, ev := range gtx.Events(&state.tag, key.FocusFilter{}) {
+		filters := []event.Filter{
+			key.FocusFilter{},
+		}
+		if e.focused && e.focus == state.key {
+			filters = append(filters, key.Filter{Name: key.NameReturn}, key.Filter{Name: key.NameSpace})
+		}
+		for _, ev := range gtx.Events(&state.tag, filters...) {
 			switch ev := ev.(type) {
 			case key.FocusEvent:
 				if ev.Focus {
@@ -69,7 +76,7 @@ func (e *Enum) Update(gtx layout.Context) bool {
 					e.focused = false
 				}
 			case key.Event:
-				if !e.focused || ev.State != key.Release {
+				if ev.State != key.Release {
 					break
 				}
 				if ev.Name != key.NameReturn && ev.Name != key.NameSpace {
@@ -117,9 +124,7 @@ func (e *Enum) Layout(gtx layout.Context, k string, content layout.Widget) layou
 	}
 	clk := &state.click
 	clk.Add(gtx.Ops)
-	if gtx.Enabled() {
-		key.InputOp{Tag: &state.tag, Keys: "⏎|Space"}.Add(gtx.Ops)
-	}
+	event.InputOp(gtx.Ops, &state.tag)
 	semantic.SelectedOp(k == e.Value).Add(gtx.Ops)
 	semantic.EnabledOp(gtx.Enabled()).Add(gtx.Ops)
 	c.Add(gtx.Ops)

widget/selectable.go

@@ -204,12 +204,7 @@ func (l *Selectable) Layout(gtx layout.Context, lt *text.Shaper, font font.Font,
 	dims := l.text.Dimensions()
 	defer clip.Rect(image.Rectangle{Max: dims.Size}).Push(gtx.Ops).Pop()
 	pointer.CursorText.Add(gtx.Ops)
-	var keys key.Set
-	if l.focused {
-		const keyFilter = "(ShortAlt)-(Shift)-[←,→,↑,↓]|(Shift)-[⇞,⇟,⇱,⇲]|Short-[C,X,A]"
-		keys = keyFilter
-	}
-	key.InputOp{Tag: l, Keys: keys}.Add(gtx.Ops)
+	event.InputOp(gtx.Ops, l)
 
 	l.clicker.Add(gtx.Ops)
 	l.dragger.Add(gtx.Ops)
@@ -304,7 +299,27 @@ func (e *Selectable) clickDragEvents(gtx layout.Context) []event.Event {
 }
 
 func (e *Selectable) processKey(gtx layout.Context) {
-	for _, ke := range gtx.Events(e, key.FocusFilter{}) {
+	filters := []event.Filter{
+		key.FocusFilter{},
+	}
+	if e.focused {
+		filters = append(filters,
+			key.Filter{Name: key.NameLeftArrow, Optional: key.ModShortcutAlt | key.ModShift},
+			key.Filter{Name: key.NameRightArrow, Optional: key.ModShortcutAlt | key.ModShift},
+			key.Filter{Name: key.NameUpArrow, Optional: key.ModShortcutAlt | key.ModShift},
+			key.Filter{Name: key.NameDownArrow, Optional: key.ModShortcutAlt | key.ModShift},
+
+			key.Filter{Name: key.NamePageUp, Optional: key.ModShift},
+			key.Filter{Name: key.NamePageDown, Optional: key.ModShift},
+			key.Filter{Name: key.NameEnd, Optional: key.ModShift},
+			key.Filter{Name: key.NameHome, Optional: key.ModShift},
+
+			key.Filter{Name: "C", Required: key.ModShortcut},
+			key.Filter{Name: "X", Required: key.ModShortcut},
+			key.Filter{Name: "A", Required: key.ModShortcut},
+		)
+	}
+	for _, ke := range gtx.Events(e, filters...) {
 		switch ke := ke.(type) {
 		case key.FocusEvent:
 			e.focused = ke.Focus

widget/selectable_test.go

@@ -57,8 +57,10 @@ func TestSelectableMove(t *testing.T) {
 	s.SetCaret(3, 6)
 	s.Layout(gtx, cache, font.Font{}, fontSize, op.CallOp{}, op.CallOp{})
 	r.Frame(gtx.Ops)
+	s.Layout(gtx, cache, font.Font{}, fontSize, op.CallOp{}, op.CallOp{})
+	r.Frame(gtx.Ops)
 
-	for _, keyName := range []string{key.NameLeftArrow, key.NameRightArrow, key.NameUpArrow, key.NameDownArrow} {
+	for _, keyName := range []key.Name{key.NameLeftArrow, key.NameRightArrow, key.NameUpArrow, key.NameDownArrow} {
 		// Select 345
 		s.SetCaret(3, 6)
 		if start, end := s.Selection(); start != 3 || end != 6 {