accessibility_handler.go RawHistoryFolder

1package cef
2
3import (
4	"time"
5
6	purecef "github.com/bnema/purego-cef/cef"
7)
8
9// accessibilityPayload is the UI-thread serialization result handed to a
10// non-blocking sink. Capture, stats, and I/O happen off the CEF UI thread.
11type accessibilityPayload struct {
12	Kind           string
13	JSON           string
14	Bytes          int
15	SerializeNanos int64
16}
17
18type accessibilityHandler struct {
19	sink      func(accessibilityPayload) bool
20	writeJSON func(purecef.Value, purecef.JsonWriterOptions) string
21}
22
23var _ purecef.AccessibilityHandler = (*accessibilityHandler)(nil)
24
25func newAccessibilityHandler(sink func(accessibilityPayload) bool) purecef.AccessibilityHandler {
26	return &accessibilityHandler{
27		sink:      sink,
28		writeJSON: purecef.WriteJson,
29	}
30}
31
32func (h *accessibilityHandler) OnAccessibilityTreeChange(value purecef.Value) {
33	h.emit(accessibilityCaptureKindTree, value)
34}
35
36func (h *accessibilityHandler) OnAccessibilityLocationChange(value purecef.Value) {
37	h.emit(accessibilityCaptureKindLocation, value)
38}
39
40func (h *accessibilityHandler) emit(kind string, value purecef.Value) {
41	if h == nil || h.sink == nil {
42		return
43	}
44	if value == nil {
45		return
46	}
47	started := time.Now()
48	jsonText := h.writeJSON(value, purecef.JsonWriterOptionsJsonWriterDefault)
49	h.sink(accessibilityPayload{
50		Kind:           kind,
51		JSON:           jsonText,
52		Bytes:          len(jsonText),
53		SerializeNanos: time.Since(started).Nanoseconds(),
54	})
55}
56
57func (wv *WebView) enqueueAccessibilityPayload(p accessibilityPayload) bool {
58	if wv == nil || wv.a11yWorker == nil {
59		return false
60	}
61	return wv.a11yWorker.Submit(p)
62}