/
event.go
182 lines (155 loc) · 3.1 KB
/
event.go
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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
package x
import (
"log"
"os"
"sync"
"github.com/BurntSushi/xgb"
"github.com/BurntSushi/xgb/randr"
"github.com/BurntSushi/xgb/xproto"
)
type Eventer interface {
Enqueue(xgb.Event, xgb.Error)
Dequeue() Event
ManageEventsOn(*xgb.Conn, chan struct{}, chan struct{}, chan struct{})
Empty() bool
Caller
Ender
}
type Xevent int
const (
UnknownEvent Xevent = iota
MapRequest
DestroyNotify
UnmapNotify
ClientMessage
ConfigureRequest
PropertyNotify
EnterNotify
MotionNotify
FocusIn
ScreenChange
KeyPressEvent
KeyReleaseEvent
ButtonPressEvent
ButtonReleaseEvent
)
type Event struct {
Tag Xevent
Evt xgb.Event
Err xgb.Error
}
func newEvent(evt xgb.Event, err xgb.Error) Event {
return Event{
Tag: idEvent(evt),
Evt: evt,
Err: err,
}
}
func idEvent(evt xgb.Event) Xevent {
switch evt.(type) {
case xproto.MapRequestEvent:
return MapRequest
case xproto.DestroyNotifyEvent:
return DestroyNotify
case xproto.UnmapNotifyEvent:
return UnmapNotify
case xproto.ClientMessageEvent:
return ClientMessage
case xproto.ConfigureRequestEvent:
return ConfigureRequest
case xproto.PropertyNotifyEvent:
return PropertyNotify
case xproto.EnterNotifyEvent:
return EnterNotify
case xproto.MotionNotifyEvent:
return MotionNotify
case xproto.FocusInEvent:
return FocusIn
case randr.ScreenChangeNotifyEvent:
return ScreenChange
case xproto.KeyPressEvent:
return KeyPressEvent
case xproto.KeyReleaseEvent:
return KeyReleaseEvent
case xproto.ButtonPressEvent:
return ButtonPressEvent
case xproto.ButtonReleaseEvent:
return ButtonReleaseEvent
}
return UnknownEvent
}
type eventer struct {
*log.Logger
events []Event
elk *sync.RWMutex
*caller
*ender
}
func newEventer() *eventer {
return &eventer{
Logger: log.New(os.Stderr, "x:handle:eventer: ", log.Lmicroseconds|log.Llongfile),
events: make([]Event, 0),
elk: &sync.RWMutex{},
caller: newCaller(),
ender: newEnder(),
}
}
func (e *eventer) Enqueue(evt xgb.Event, err xgb.Error) {
e.elk.Lock()
defer e.elk.Unlock()
e.events = append(e.events, newEvent(evt, err))
}
func (e *eventer) Dequeue() Event {
e.elk.Lock()
defer e.elk.Unlock()
ret := e.events[0]
e.events = e.events[1:]
return ret
}
func (e *eventer) ManageEventsOn(c *xgb.Conn, pre, post, quit chan struct{}) {
for {
if e.Ending() {
if quit != nil {
quit <- struct{}{}
}
break
}
e.read(c)
e.process(pre, post)
}
}
func (e *eventer) read(c *xgb.Conn) {
ev, err := c.WaitForEvent()
if ev == nil && err == nil {
e.Fatal("eventer could not read an event or an error.")
}
e.Enqueue(ev, err)
}
func (e *eventer) process(pre, post chan struct{}) {
for !e.Empty() {
if e.Ending() {
return
}
pre <- struct{}{}
evt := e.Dequeue()
v, err := evt.Evt, evt.Err
if err != nil {
e.Println(err.Error())
post <- struct{}{}
continue
}
if v == nil {
e.Fatal("eventer.process expected an event but got nil.")
}
callErr := e.Call(evt)
if callErr != nil {
e.Println(callErr.Error())
}
post <- struct{}{}
}
}
func (e *eventer) Empty() bool {
e.elk.Lock()
defer e.elk.Unlock()
return len(e.events) == 0
}