blob: 7b1d5422ed0b9ae4b131c135389f1b807dcf775d (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
// Copyright 2017 The Walk Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build windows
package walk
type intRangeEventHandlerInfo struct {
handler IntRangeEventHandler
once bool
}
type IntRangeEventHandler func(from, to int)
type IntRangeEvent struct {
handlers []intRangeEventHandlerInfo
}
func (e *IntRangeEvent) Attach(handler IntRangeEventHandler) int {
handlerInfo := intRangeEventHandlerInfo{handler, false}
for i, h := range e.handlers {
if h.handler == nil {
e.handlers[i] = handlerInfo
return i
}
}
e.handlers = append(e.handlers, handlerInfo)
return len(e.handlers) - 1
}
func (e *IntRangeEvent) Detach(handle int) {
e.handlers[handle].handler = nil
}
func (e *IntRangeEvent) Once(handler IntRangeEventHandler) {
i := e.Attach(handler)
e.handlers[i].once = true
}
type IntRangeEventPublisher struct {
event IntRangeEvent
}
func (p *IntRangeEventPublisher) Event() *IntRangeEvent {
return &p.event
}
func (p *IntRangeEventPublisher) Publish(from, to int) {
for i, h := range p.event.handlers {
if h.handler != nil {
h.handler(from, to)
if h.once {
p.event.Detach(i)
}
}
}
}
|
