io/input,io/clipboard: [API] replace ReadOp with command

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

app/os_android.go

@@ -123,12 +123,14 @@ import (
 	"fmt"
 	"image"
 	"image/color"
+	"io"
 	"math"
 	"os"
 	"path/filepath"
 	"runtime"
 	"runtime/cgo"
 	"runtime/debug"
+	"strings"
 	"sync"
 	"time"
 	"unicode/utf16"
@@ -137,12 +139,12 @@ import (
 	"gioui.org/internal/f32color"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
 	"gioui.org/io/input"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/semantic"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/unit"
 )
 
@@ -1311,7 +1313,12 @@ func (w *window) ReadClipboard() {
 			return
 		}
 		content := goString(env, C.jstring(c))
-		w.callbacks.Event(clipboard.Event{Text: content})
+		w.callbacks.Event(transfer.DataEvent{
+			Type: "application/text",
+			Open: func() io.ReadCloser {
+				return io.NopCloser(strings.NewReader(content))
+			},
+		})
 	})
 }
 

app/os_ios.go

@@ -72,17 +72,19 @@ import "C"
 
 import (
 	"image"
+	"io"
 	"runtime"
 	"runtime/debug"
+	"strings"
 	"time"
 	"unicode/utf16"
 	"unsafe"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/unit"
 )
 
@@ -265,7 +267,12 @@ func (w *window) ReadClipboard() {
 	cstr := C.readClipboard()
 	defer C.CFRelease(cstr)
 	content := nsstringToString(cstr)
-	w.w.Event(clipboard.Event{Text: content})
+	w.w.Event(transfer.DataEvent{
+		Type: "application/text",
+		Open: func() io.ReadCloser {
+			return io.NopCloser(strings.NewReader(content))
+		},
+	})
 }
 
 func (w *window) WriteClipboard(mime string, s []byte) {

app/os_js.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"image"
 	"image/color"
+	"io"
 	"strings"
 	"syscall/js"
 	"time"
@@ -15,10 +16,10 @@ import (
 	"gioui.org/internal/f32color"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/unit"
 )
 
@@ -101,7 +102,12 @@ func newWindow(win *callbacks, options []Option) error {
 	})
 	w.clipboardCallback = w.funcOf(func(this js.Value, args []js.Value) interface{} {
 		content := args[0].String()
-		go win.Event(clipboard.Event{Text: content})
+		go win.Event(transfer.DataEvent{
+			Type: "application/text",
+			Open: func() io.ReadCloser {
+				return io.NopCloser(strings.NewReader(content))
+			},
+		})
 		return nil
 	})
 	w.addEventListeners()

app/os_macos.go

@@ -8,16 +8,18 @@ package app
 import (
 	"errors"
 	"image"
+	"io"
 	"runtime"
+	"strings"
 	"time"
 	"unicode"
 	"unicode/utf8"
 
 	"gioui.org/internal/f32"
-	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/unit"
 
 	_ "gioui.org/internal/cocoainit"
@@ -305,7 +307,12 @@ func (w *window) ReadClipboard() {
 		defer C.CFRelease(cstr)
 	}
 	content := nsstringToString(cstr)
-	w.w.Event(clipboard.Event{Text: content})
+	w.w.Event(transfer.DataEvent{
+		Type: "application/text",
+		Open: func() io.ReadCloser {
+			return io.NopCloser(strings.NewReader(content))
+		},
+	})
 }
 
 func (w *window) WriteClipboard(mime string, s []byte) {

app/os_wayland.go

@@ -25,10 +25,10 @@ import (
 	"gioui.org/app/internal/xkb"
 	"gioui.org/f32"
 	"gioui.org/internal/fling"
-	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/unit"
 )
 
@@ -209,7 +209,7 @@ type window struct {
 	wsize        image.Point // window config size before going fullscreen or maximized
 	inCompositor bool        // window is moving or being resized
 
-	clipReads chan clipboard.Event
+	clipReads chan transfer.DataEvent
 
 	wakeups chan struct{}
 }
@@ -354,7 +354,7 @@ func (d *wlDisplay) createNativeWindow(options []Option) (*window, error) {
 		ppdp:      ppdp,
 		ppsp:      ppdp,
 		wakeups:   make(chan struct{}, 1),
-		clipReads: make(chan clipboard.Event, 1),
+		clipReads: make(chan transfer.DataEvent, 1),
 	}
 	w.surf = C.wl_compositor_create_surface(d.compositor)
 	if w.surf == nil {
@@ -1021,14 +1021,18 @@ func (w *window) ReadClipboard() {
 	r, err := w.disp.readClipboard()
 	// Send empty responses on unavailable clipboards or errors.
 	if r == nil || err != nil {
-		w.w.Event(clipboard.Event{})
 		return
 	}
 	// Don't let slow clipboard transfers block event loop.
 	go func() {
 		defer r.Close()
 		data, _ := io.ReadAll(r)
-		w.clipReads <- clipboard.Event{Text: string(data)}
+		w.clipReads <- transfer.DataEvent{
+			Type: "application/text",
+			Open: func() io.ReadCloser {
+				return io.NopCloser(bytes.NewReader(data))
+			},
+		}
 		w.Wakeup()
 	}()
 }

app/os_windows.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"image"
+	"io"
 	"runtime"
 	"sort"
 	"strings"
@@ -22,10 +23,10 @@ import (
 	gowindows "golang.org/x/sys/windows"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 )
 
 type ViewEvent struct {
@@ -667,7 +668,12 @@ func (w *window) readClipboard() error {
 	}
 	defer windows.GlobalUnlock(mem)
 	content := gowindows.UTF16PtrToString((*uint16)(unsafe.Pointer(ptr)))
-	w.w.Event(clipboard.Event{Text: content})
+	w.w.Event(transfer.DataEvent{
+		Type: "application/text",
+		Open: func() io.ReadCloser {
+			return io.NopCloser(strings.NewReader(content))
+		},
+	})
 	return nil
 }
 

app/os_x11.go

@@ -30,16 +30,18 @@ import (
 	"errors"
 	"fmt"
 	"image"
+	"io"
 	"strconv"
+	"strings"
 	"sync"
 	"time"
 	"unsafe"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/unit"
 
 	syscall "golang.org/x/sys/unix"
@@ -650,7 +652,12 @@ func (h *x11EventHandler) handleEvents() bool {
 				break
 			}
 			str := C.GoStringN((*C.char)(unsafe.Pointer(text.value)), C.int(text.nitems))
-			w.w.Event(clipboard.Event{Text: str})
+			w.w.Event(transfer.DataEvent{
+				Type: "application/text",
+				Open: func() io.ReadCloser {
+					return io.NopCloser(strings.NewReader(str))
+				},
+			})
 		case C.SelectionRequest:
 			cevt := (*C.XSelectionRequestEvent)(unsafe.Pointer(xev))
 			if (cevt.selection != w.atoms.clipboard && cevt.selection != w.atoms.primary) || cevt.property == C.None {

internal/ops/ops.go

@@ -63,7 +63,6 @@ const (
 	TypePass
 	TypePopPass
 	TypePointerInput
-	TypeClipboardRead
 	TypeSource
 	TypeTarget
 	TypeKeyInput
@@ -142,7 +141,6 @@ const (
 	TypePassLen             = 1
 	TypePopPassLen          = 1
 	TypePointerInputLen     = 1 + 1 + 1*2 + 2*4 + 2*4
-	TypeClipboardReadLen    = 1
 	TypeSourceLen           = 1
 	TypeTargetLen           = 1
 	TypeKeyInputLen         = 1 + 1
@@ -419,7 +417,6 @@ var opProps = [0x100]opProp{
 	TypePass:             {Size: TypePassLen, NumRefs: 0},
 	TypePopPass:          {Size: TypePopPassLen, NumRefs: 0},
 	TypePointerInput:     {Size: TypePointerInputLen, NumRefs: 1},
-	TypeClipboardRead:    {Size: TypeClipboardReadLen, NumRefs: 1},
 	TypeSource:           {Size: TypeSourceLen, NumRefs: 2},
 	TypeTarget:           {Size: TypeTargetLen, NumRefs: 2},
 	TypeKeyInput:         {Size: TypeKeyInputLen, NumRefs: 2},
@@ -484,8 +481,6 @@ func (t OpType) String() string {
 		return "PopPass"
 	case TypePointerInput:
 		return "PointerInput"
-	case TypeClipboardRead:
-		return "ClipboardRead"
 	case TypeSource:
 		return "Source"
 	case TypeTarget:

io/clipboard/clipboard.go

@@ -5,33 +5,20 @@ package clipboard
 import (
 	"io"
 
-	"gioui.org/internal/ops"
 	"gioui.org/io/event"
-	"gioui.org/op"
 )
 
-// Event is generated when the clipboard content is requested.
-type Event struct {
-	Text string
-}
-
 // WriteCmd copies Text to the clipboard.
 type WriteCmd struct {
 	Type string
 	Data io.ReadCloser
 }
 
-// ReadOp requests the text of the clipboard, delivered to
+// ReadCmd requests the text of the clipboard, delivered to
-// the current handler through an Event.
+// the handler through an [io/transfer.DataEvent].
-type ReadOp struct {
+type ReadCmd struct {
 	Tag event.Tag
 }
 
-func (h ReadOp) Add(o *op.Ops) {
-	data := ops.Write1(&o.Internal, ops.TypeClipboardReadLen, h.Tag)
-	data[0] = byte(ops.TypeClipboardRead)
-}
-
-func (Event) ImplementsEvent() {}
-
 func (WriteCmd) ImplementsCommand() {}
+func (ReadCmd) ImplementsCommand()  {}

io/input/clipboard.go

@@ -55,11 +55,10 @@ func (q *clipboardQueue) ProcessWriteClipboard(req clipboard.WriteCmd) {
 	q.text = content
 }
 
-func (q *clipboardQueue) ProcessReadClipboard(refs []interface{}) {
+func (q *clipboardQueue) ProcessReadClipboard(tag event.Tag) {
 	if q.receivers == nil {
 		q.receivers = make(map[event.Tag]struct{})
 	}
-	tag := refs[0].(event.Tag)
 	if _, ok := q.receivers[tag]; !ok {
 		q.receivers[tag] = struct{}{}
 		q.requested = false

io/input/clipboard_test.go

@@ -9,6 +9,7 @@ import (
 
 	"gioui.org/io/clipboard"
 	"gioui.org/io/event"
+	"gioui.org/io/transfer"
 	"gioui.org/op"
 )
 
@@ -16,30 +17,35 @@ func TestClipboardDuplicateEvent(t *testing.T) {
 	ops, router, handler := new(op.Ops), new(Router), make([]int, 2)
 
 	// Both must receive the event once
-	clipboard.ReadOp{Tag: &handler[0]}.Add(ops)
+	router.Source().Queue(clipboard.ReadCmd{Tag: &handler[0]})
-	clipboard.ReadOp{Tag: &handler[1]}.Add(ops)
+	router.Source().Queue(clipboard.ReadCmd{Tag: &handler[1]})
 
 	router.Frame(ops)
-	event := clipboard.Event{Text: "Test"}
+	event := transfer.DataEvent{
+		Type: "application/text",
+		Open: func() io.ReadCloser {
+			return io.NopCloser(strings.NewReader("Test"))
+		},
+	}
 	router.Queue(event)
-	assertClipboardReadOp(t, router, 0)
+	assertClipboardReadCmd(t, router, 0)
 	assertClipboardEvent(t, router.Events(&handler[0]), true)
 	assertClipboardEvent(t, router.Events(&handler[1]), true)
 	ops.Reset()
 
-	// No ReadOp
+	// No ReadCmd
 
 	router.Frame(ops)
-	assertClipboardReadOp(t, router, 0)
+	assertClipboardReadCmd(t, router, 0)
 	assertClipboardEvent(t, router.Events(&handler[0]), false)
 	assertClipboardEvent(t, router.Events(&handler[1]), false)
 	ops.Reset()
 
-	clipboard.ReadOp{Tag: &handler[0]}.Add(ops)
+	router.Source().Queue(clipboard.ReadCmd{Tag: &handler[0]})
 
 	router.Frame(ops)
 	// No ClipboardEvent sent
-	assertClipboardReadOp(t, router, 1)
+	assertClipboardReadCmd(t, router, 1)
 	assertClipboardEvent(t, router.Events(&handler[0]), false)
 	assertClipboardEvent(t, router.Events(&handler[1]), false)
 	ops.Reset()
@@ -50,34 +56,39 @@ func TestQueueProcessReadClipboard(t *testing.T) {
 	ops.Reset()
 
 	// Request read
-	clipboard.ReadOp{Tag: &handler[0]}.Add(ops)
+	router.Source().Queue(clipboard.ReadCmd{Tag: &handler[0]})
 
 	router.Frame(ops)
-	assertClipboardReadOp(t, router, 1)
+	assertClipboardReadCmd(t, router, 1)
 	ops.Reset()
 
 	for i := 0; i < 3; i++ {
-		// No ReadOp
+		// No ReadCmd
 		// One receiver must still wait for response
 
 		router.Frame(ops)
-		assertClipboardReadOpDuplicated(t, router, 1)
+		assertClipboardReadDuplicated(t, router, 1)
 		ops.Reset()
 	}
 
 	router.Frame(ops)
 	// Send the clipboard event
-	event := clipboard.Event{Text: "Text 2"}
+	event := transfer.DataEvent{
+		Type: "application/text",
+		Open: func() io.ReadCloser {
+			return io.NopCloser(strings.NewReader("Text 2"))
+		},
+	}
 	router.Queue(event)
-	assertClipboardReadOp(t, router, 0)
+	assertClipboardReadCmd(t, router, 0)
 	assertClipboardEvent(t, router.Events(&handler[0]), true)
 	ops.Reset()
 
-	// No ReadOp
+	// No ReadCmd
 	// There's no receiver waiting
 
 	router.Frame(ops)
-	assertClipboardReadOp(t, router, 0)
+	assertClipboardReadCmd(t, router, 0)
 	assertClipboardEvent(t, router.Events(&handler[0]), false)
 	ops.Reset()
 }
@@ -102,7 +113,7 @@ func TestQueueProcessWriteClipboard(t *testing.T) {
 	router.Source().Queue(clipboard.WriteCmd{Type: mime, Data: io.NopCloser(strings.NewReader("Write 2"))})
 
 	router.Frame(ops)
-	assertClipboardReadOp(t, router, 0)
+	assertClipboardReadCmd(t, router, 0)
 	assertClipboardWriteCmd(t, router, mime, "Write 2")
 	ops.Reset()
 }
@@ -112,7 +123,7 @@ func assertClipboardEvent(t *testing.T, events []event.Event, expected bool) {
 	var evtClipboard int
 	for _, e := range events {
 		switch e.(type) {
-		case clipboard.Event:
+		case transfer.DataEvent:
 			evtClipboard++
 		}
 	}
@@ -124,7 +135,7 @@ func assertClipboardEvent(t *testing.T, events []event.Event, expected bool) {
 	}
 }
 
-func assertClipboardReadOp(t *testing.T, router *Router, expected int) {
+func assertClipboardReadCmd(t *testing.T, router *Router, expected int) {
 	t.Helper()
 	if len(router.cqueue.receivers) != expected {
 		t.Error("unexpected number of receivers")
@@ -134,7 +145,7 @@ func assertClipboardReadOp(t *testing.T, router *Router, expected int) {
 	}
 }
 
-func assertClipboardReadOpDuplicated(t *testing.T, router *Router, expected int) {
+func assertClipboardReadDuplicated(t *testing.T, router *Router, expected int) {
 	t.Helper()
 	if len(router.cqueue.receivers) != expected {
 		t.Error("receivers removed")

io/input/router.go

@@ -198,7 +198,7 @@ func (q *Router) Queue(events ...event.Event) bool {
 			if f := q.key.queue.focus; f != nil {
 				q.handlers.Add(f, e)
 			}
-		case clipboard.Event:
+		case transfer.DataEvent:
 			q.cqueue.Push(e, &q.handlers)
 		}
 	}
@@ -224,6 +224,8 @@ func (q *Router) executeCommands() {
 			q.pointer.queue.offerData(req, &q.handlers)
 		case clipboard.WriteCmd:
 			q.cqueue.ProcessWriteClipboard(req)
+		case clipboard.ReadCmd:
+			q.cqueue.ProcessReadClipboard(req.Tag)
 		}
 	}
 	q.commands = nil
@@ -429,8 +431,6 @@ func (q *Router) collect() {
 				q.wakeup = true
 				q.wakeupTime = op.At
 			}
-		case ops.TypeClipboardRead:
-			q.cqueue.ProcessReadClipboard(encOp.Refs)
 		case ops.TypeSave:
 			id := ops.DecodeSave(encOp.Data)
 			if extra := id - len(q.savedTrans) + 1; extra > 0 {

widget/editor.go

@@ -21,6 +21,7 @@ import (
 	"gioui.org/io/pointer"
 	"gioui.org/io/semantic"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/layout"
 	"gioui.org/op"
 	"gioui.org/op/clip"
@@ -377,10 +378,13 @@ func (e *Editor) processKey(gtx layout.Context) {
 				})
 			}
 		// Complete a paste event, initiated by Shortcut-V in Editor.command().
-		case clipboard.Event:
+		case transfer.DataEvent:
 			e.scrollCaret = true
 			e.scroller.Stop()
-			e.Insert(ke.Text)
+			content, err := io.ReadAll(ke.Open())
+			if err == nil {
+				e.Insert(string(content))
+			}
 		case key.SelectionEvent:
 			e.scrollCaret = true
 			e.scroller.Stop()
@@ -411,7 +415,7 @@ func (e *Editor) command(gtx layout.Context, k key.Event) {
 		// half is in Editor.processKey() under clipboard.Event.
 		case "V":
 			if !e.ReadOnly {
-				clipboard.ReadOp{Tag: &e.eventKey}.Add(gtx.Ops)
+				gtx.Queue(clipboard.ReadCmd{Tag: &e.eventKey})
 			}
 		// Copy or Cut selection -- ignored if nothing selected.
 		case "C", "X":