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// Copyright 2021 The golang.design Initiative Authors.
// All rights reserved. Use of this source code is governed
// by a MIT license that can be found in the LICENSE file.
//
// Written by Changkun Ou <changkun.de>
//go:build ios
package clipboard
/*
#cgo CFLAGS: -x objective-c
#cgo LDFLAGS: -framework Foundation -framework UIKit -framework MobileCoreServices
#import <stdlib.h>
void clipboard_write_string(char *s);
char *clipboard_read_string();
*/
import "C"
import (
"bytes"
"context"
"time"
"unsafe"
)
func initialize() error { return nil }
func read(t Format) (buf []byte, err error) {
switch t {
case FmtText:
return []byte(C.GoString(C.clipboard_read_string())), nil
case FmtImage:
return nil, errUnsupported
default:
return nil, errUnsupported
}
}
// SetContent sets the clipboard content for iOS
func write(t Format, buf []byte) (<-chan struct{}, error) {
done := make(chan struct{}, 1)
switch t {
case FmtText:
cs := C.CString(string(buf))
defer C.free(unsafe.Pointer(cs))
C.clipboard_write_string(cs)
return done, nil
case FmtImage:
return nil, errUnsupported
default:
return nil, errUnsupported
}
}
func watch(ctx context.Context, t Format) <-chan []byte {
recv := make(chan []byte, 1)
ti := time.NewTicker(time.Second)
last := Read(t)
go func() {
for {
select {
case <-ctx.Done():
close(recv)
return
case <-ti.C:
b := Read(t)
if b == nil {
continue
}
if bytes.Compare(last, b) != 0 {
recv <- b
last = b
}
}
}
}()
return recv
}
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