widget: [API] re-implement Editor.Focus in terms of commands

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

app/ime_test.go

@@ -31,10 +31,10 @@ func FuzzIME(f *testing.F) {
 	f.Fuzz(func(t *testing.T, cmds []byte) {
 		cache := text.NewShaper(text.WithCollection(gofont.Collection()))
 		e := new(widget.Editor)
-		e.Focus()
 
 		var r input.Router
 		gtx := layout.Context{Ops: new(op.Ops), Source: r.Source()}
+		e.Focus(gtx)
 		// Layout once to register focus.
 		e.Layout(gtx, cache, font.Font{}, unit.Sp(10), op.CallOp{}, op.CallOp{})
 		r.Frame(gtx.Ops)

widget/editor.go

@@ -69,11 +69,10 @@ type Editor struct {
 	buffer *editBuffer
 	// scratch is a byte buffer that is reused to efficiently read portions of text
 	// from the textView.
-	scratch      []byte
-	eventKey     int
-	blinkStart   time.Time
-	focused      bool
-	requestFocus bool
+	scratch    []byte
+	eventKey   int
+	blinkStart time.Time
+	focused    bool
 
 	// ime tracks the state relevant to input methods.
 	ime struct {
@@ -246,7 +245,7 @@ func (e *Editor) processPointer(gtx layout.Context) {
 					X: int(math.Round(float64(evt.Position.X))),
 					Y: int(math.Round(float64(evt.Position.Y))),
 				})
-				e.requestFocus = true
+				e.Focus(gtx)
 				if e.scroller.State() != gesture.StateFlinging {
 					e.scrollCaret = true
 				}
@@ -492,8 +491,9 @@ func (e *Editor) command(gtx layout.Context, k key.Event) {
 }
 
 // Focus requests the input focus for the Editor.
-func (e *Editor) Focus() {
-	e.requestFocus = true
+func (e *Editor) Focus(gtx layout.Context) {
+	gtx.Queue(key.FocusCmd{Tag: &e.eventKey})
+	gtx.Queue(key.SoftKeyboardCmd{Show: true})
 }
 
 // Focused returns whether the editor is focused or not.
@@ -644,11 +644,6 @@ func (e *Editor) layout(gtx layout.Context, textMaterial, selectMaterial op.Call
 		}
 	}
 	key.InputOp{Tag: &e.eventKey, Hint: e.InputHint, Keys: keys}.Add(gtx.Ops)
-	if e.requestFocus {
-		gtx.Queue(key.FocusCmd{Tag: &e.eventKey})
-		gtx.Queue(key.SoftKeyboardCmd{Show: true})
-	}
-	e.requestFocus = false
 
 	var scrollRange image.Rectangle
 	if e.SingleLine {

widget/editor_test.go

@@ -115,7 +115,7 @@ func TestEditorReadOnly(t *testing.T) {
 	if cStart != cEnd {
 		t.Errorf("unexpected initial caret positions")
 	}
-	e.Focus()
+	e.Focus(gtx)
 	layoutEditor := func() layout.Dimensions {
 		return e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
 	}
@@ -511,7 +511,7 @@ func TestEditorDimensions(t *testing.T) {
 	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
-	e.Focus()
+	e.Focus(gtx)
 	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
 	r.Frame(gtx.Ops)
 	r.Queue(key.EditEvent{Text: "A"})
@@ -904,7 +904,7 @@ g 2 4 6 8 g
 		e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
 		e.Events() // throw away any events from this layout
 
-		e.Focus()
+		e.Focus(gtx)
 		r.Frame(gtx.Ops)
 		gtx.Source = r.Source()
 		// Build the selection events
@@ -998,7 +998,7 @@ func TestSelectMove(t *testing.T) {
 	fontSize := unit.Sp(10)
 
 	// Layout once to populate e.lines and get focus.
-	e.Focus()
+	e.Focus(gtx)
 	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
 	r.Frame(gtx.Ops)
 	// Set up selecton so the Editor key handler filters for all 4 directional keys.
@@ -1085,7 +1085,7 @@ func TestEditor_MaxLen(t *testing.T) {
 	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
-	e.Focus()
+	e.Focus(gtx)
 	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
 	r.Frame(gtx.Ops)
 	r.Queue(
@@ -1121,7 +1121,7 @@ func TestEditor_Filter(t *testing.T) {
 	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
-	e.Focus()
+	e.Focus(gtx)
 	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
 	r.Frame(gtx.Ops)
 	r.Queue(
@@ -1151,7 +1151,7 @@ func TestEditor_Submit(t *testing.T) {
 	cache := text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Collection()))
 	fontSize := unit.Sp(10)
 	font := font.Font{}
-	e.Focus()
+	e.Focus(gtx)
 	e.Layout(gtx, cache, font, fontSize, op.CallOp{}, op.CallOp{})
 	r.Frame(gtx.Ops)
 	r.Queue(