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clipboard.go
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clipboard.go
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// SPDX-License-Identifier: Unlicense OR MIT
package input
import (
"io"
"github.com/utopiagio/gio/io/clipboard"
"github.com/utopiagio/gio/io/event"
)
// clipboardState contains the state for clipboard event routing.
type clipboardState struct {
receivers []event.Tag
}
type clipboardQueue struct {
// request avoid read clipboard every frame while waiting.
requested bool
mime string
text []byte
}
// WriteClipboard returns the most recent data to be copied
// to the clipboard, if any.
func (q *clipboardQueue) WriteClipboard() (mime string, content []byte, ok bool) {
if q.text == nil {
return "", nil, false
}
content = q.text
q.text = nil
return q.mime, content, true
}
// ClipboardRequested reports if any new handler is waiting
// to read the clipboard.
func (q *clipboardQueue) ClipboardRequested(state clipboardState) bool {
req := len(state.receivers) > 0 && q.requested
q.requested = false
return req
}
func (q *clipboardQueue) Push(state clipboardState, e event.Event) (clipboardState, []taggedEvent) {
var evts []taggedEvent
for _, r := range state.receivers {
evts = append(evts, taggedEvent{tag: r, event: e})
}
state.receivers = nil
return state, evts
}
func (q *clipboardQueue) ProcessWriteClipboard(req clipboard.WriteCmd) {
defer req.Data.Close()
content, err := io.ReadAll(req.Data)
if err != nil {
return
}
q.mime = req.Type
q.text = content
}
func (q *clipboardQueue) ProcessReadClipboard(state clipboardState, tag event.Tag) clipboardState {
for _, k := range state.receivers {
if k == tag {
return state
}
}
n := len(state.receivers)
state.receivers = append(state.receivers[:n:n], tag)
q.requested = true
return state
}