Use Gio clipboard commands on Android

clipboard_gio.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"io"
+	"strings"
+	"sync"
+
+	gioclipboard "gioui.org/io/clipboard"
+	"gioui.org/layout"
+
+	appclipboard "git.julianfamily.org/keepassgo/clipboard"
+)
+
+type clipboardCommandWriter struct {
+	mu         sync.Mutex
+	pending    []string
+	invalidate func()
+}
+
+func newPlatformClipboardWriter(goos string, invalidate func()) appclipboard.Writer {
+	if strings.EqualFold(goos, "android") {
+		return &clipboardCommandWriter{invalidate: invalidate}
+	}
+	return nil
+}
+
+func processClipboardWrites(gtx layout.Context, writer appclipboard.Writer) {
+	commandWriter, ok := writer.(*clipboardCommandWriter)
+	if !ok {
+		return
+	}
+	commandWriter.Process(gtx)
+}
+
+func (w *clipboardCommandWriter) WriteText(text string) error {
+	w.mu.Lock()
+	w.pending = append(w.pending, text)
+	w.mu.Unlock()
+	if w.invalidate != nil {
+		w.invalidate()
+	}
+	return nil
+}
+
+func (w *clipboardCommandWriter) Process(gtx layout.Context) {
+	for _, text := range w.drain() {
+		gtx.Execute(gioclipboard.WriteCmd{
+			Type: "application/text",
+			Data: io.NopCloser(strings.NewReader(text)),
+		})
+	}
+}
+
+func (w *clipboardCommandWriter) drain() []string {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if len(w.pending) == 0 {
+		return nil
+	}
+	pending := append([]string(nil), w.pending...)
+	w.pending = nil
+	return pending
+}