app: move system.ClipboardEvent to its own package

API change. Update your code with gofmt rule and goimports:

gofmt -r "system.ClipboardEvent -> clipboard.Event"
goimports

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

app/internal/window/os_android.go

@@ -52,6 +52,7 @@ import (
 	"unsafe"
 
 	"gioui.org/f32"
+	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
@@ -647,7 +648,7 @@ func (w *window) ReadClipboard() {
 			return
 		}
 		content := goString(env, C.jstring(c))
-		w.callbacks.Event(system.ClipboardEvent{Text: content})
+		w.callbacks.Event(clipboard.Event{Text: content})
 	})
 }
 

app/internal/window/os_ios.go

@@ -38,6 +38,7 @@ import (
 	"unsafe"
 
 	"gioui.org/f32"
+	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
@@ -223,7 +224,7 @@ func onTouch(last C.int, view, touchRef C.CFTypeRef, phase C.NSInteger, x, y C.C
 func (w *window) ReadClipboard() {
 	runOnMain(func() {
 		content := nsstringToString(C.gio_readClipboard())
-		w.w.Event(system.ClipboardEvent{Text: content})
+		w.w.Event(clipboard.Event{Text: content})
 	})
 }
 

app/internal/window/os_js.go

@@ -12,6 +12,7 @@ import (
 	"unicode/utf8"
 
 	"gioui.org/f32"
+	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
@@ -59,7 +60,7 @@ func NewWindow(win Callbacks, opts *Options) error {
 	})
 	w.clipboardCallback = w.funcOf(func(this js.Value, args []js.Value) interface{} {
 		content := args[0].String()
-		win.Event(system.ClipboardEvent{Text: content})
+		win.Event(clipboard.Event{Text: content})
 		return nil
 	})
 	w.addEventListeners()

app/internal/window/os_macos.go

@@ -14,6 +14,7 @@ import (
 	"unsafe"
 
 	"gioui.org/f32"
+	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
@@ -108,7 +109,7 @@ func (w *window) contextView() C.CFTypeRef {
 func (w *window) ReadClipboard() {
 	runOnMain(func() {
 		content := nsstringToString(C.gio_readClipboard())
-		w.w.Event(system.ClipboardEvent{Text: content})
+		w.w.Event(clipboard.Event{Text: content})
 	})
 }
 

app/internal/window/os_wayland.go

@@ -22,6 +22,7 @@ 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"
@@ -1134,14 +1135,14 @@ func (w *window) process() {
 		r, err := w.disp.readClipboard()
 		// Send empty responses on unavailable clipboards or errors.
 		if r == nil || err != nil {
-			w.w.Event(system.ClipboardEvent{})
+			w.w.Event(clipboard.Event{})
 			return
 		}
 		// Don't let slow clipboard transfers block event loop.
 		go func() {
 			defer r.Close()
 			data, _ := ioutil.ReadAll(r)
-			w.w.Event(system.ClipboardEvent{Text: string(data)})
+			w.w.Event(clipboard.Event{Text: string(data)})
 		}()
 	}
 	if writeClipboard != nil {

app/internal/window/os_windows.go

@@ -22,6 +22,7 @@ import (
 	"gioui.org/unit"
 
 	"gioui.org/f32"
+	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
@@ -513,7 +514,7 @@ func (w *window) readClipboard() error {
 	hdr.Len = n
 	content := string(utf16.Decode(u16))
 	go func() {
-		w.w.Event(system.ClipboardEvent{Text: content})
+		w.w.Event(clipboard.Event{Text: content})
 	}()
 	return nil
 }

app/internal/window/os_x11.go

@@ -36,6 +36,7 @@ import (
 	"unsafe"
 
 	"gioui.org/f32"
+	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
@@ -434,7 +435,7 @@ func (h *x11EventHandler) handleEvents() bool {
 				break
 			}
 			str := C.GoStringN((*C.char)(unsafe.Pointer(text.value)), C.int(text.nitems))
-			w.w.Event(system.ClipboardEvent{Text: str})
+			w.w.Event(clipboard.Event{Text: str})
 		case C.SelectionRequest:
 			cevt := (*C.XSelectionRequestEvent)(unsafe.Pointer(xev))
 			if cevt.selection != w.atoms.clipboard || cevt.property == C.None {

app/window.go

@@ -195,7 +195,7 @@ func (w *Window) Invalidate() {
 }
 
 // ReadClipboard initiates a read of the clipboard in the form
-// of a system.ClipboardEvent. Multiple reads may be coalesced
+// of a clipboard.Event. Multiple reads may be coalesced
 // to a single event.
 func (w *Window) ReadClipboard() {
 	go w.driverDo(func() {

io/clipboard/clipboard.go

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package clipboard
+
+// Event is generated when the clipboard content is requested.
+type Event struct {
+	Text string
+}
+
+func (Event) ImplementsEvent() {}

io/system/system.go

@@ -60,12 +60,6 @@ type DestroyEvent struct {
 	Err error
 }
 
-// ClipboardEvent is sent once for each request for the
-// clipboard content.
-type ClipboardEvent struct {
-	Text string
-}
-
 // Insets is the space taken up by
 // system decoration such as translucent
 // system bars and software keyboards.
@@ -118,8 +112,7 @@ func (l Stage) String() string {
 	}
 }
 
-func (FrameEvent) ImplementsEvent()     {}
-func (StageEvent) ImplementsEvent()     {}
-func (*CommandEvent) ImplementsEvent()  {}
-func (DestroyEvent) ImplementsEvent()   {}
-func (ClipboardEvent) ImplementsEvent() {}
+func (FrameEvent) ImplementsEvent()    {}
+func (StageEvent) ImplementsEvent()    {}
+func (*CommandEvent) ImplementsEvent() {}
+func (DestroyEvent) ImplementsEvent()  {}