blob: 019a00a716dc126dd1d39500d62afa8c0ff44f53 (
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
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
|
// Copyright 2013 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 Condition interface {
Expression
Satisfied() bool
}
type MutableCondition struct {
satisfied bool
changedPublisher EventPublisher
}
func NewMutableCondition() *MutableCondition {
return new(MutableCondition)
}
func (mc *MutableCondition) Value() interface{} {
return mc.satisfied
}
func (mc *MutableCondition) Satisfied() bool {
return mc.satisfied
}
func (mc *MutableCondition) SetSatisfied(satisfied bool) error {
if satisfied == mc.satisfied {
return nil
}
mc.satisfied = satisfied
mc.changedPublisher.Publish()
return nil
}
func (mc *MutableCondition) Changed() *Event {
return mc.changedPublisher.Event()
}
type DelegateCondition struct {
satisfied func() bool
changed *Event
}
func NewDelegateCondition(satisfied func() bool, changed *Event) *DelegateCondition {
return &DelegateCondition{satisfied, changed}
}
func (dc *DelegateCondition) Value() interface{} {
return dc.satisfied()
}
func (dc *DelegateCondition) Satisfied() bool {
return dc.satisfied()
}
func (dc *DelegateCondition) Changed() *Event {
return dc.changed
}
type compositeCondition struct {
items []Condition
itemsChangedHandles []int
changedPublisher EventPublisher
}
func (cc *compositeCondition) init(items []Condition) {
cc.items = append(cc.items, items...)
for _, item := range items {
handle := item.Changed().Attach(func() {
cc.changedPublisher.Publish()
})
cc.itemsChangedHandles = append(cc.itemsChangedHandles, handle)
}
}
func (cc *compositeCondition) satisfied(all bool) bool {
for _, item := range cc.items {
if all != item.Satisfied() {
return !all
}
}
return all
}
func (cc *compositeCondition) Changed() *Event {
return cc.changedPublisher.Event()
}
func (cc *compositeCondition) Dispose() {
for i, item := range cc.items {
item.Changed().Detach(cc.itemsChangedHandles[i])
}
}
type allCondition struct {
compositeCondition
}
func NewAllCondition(items ...Condition) Condition {
ac := new(allCondition)
ac.init(items)
return ac
}
func (ac *allCondition) Value() interface{} {
return ac.Satisfied()
}
func (ac *allCondition) Satisfied() bool {
return ac.satisfied(true)
}
type anyCondition struct {
compositeCondition
}
func NewAnyCondition(items ...Condition) Condition {
ac := new(anyCondition)
ac.init(items)
return ac
}
func (ac *anyCondition) Value() interface{} {
return ac.Satisfied()
}
func (ac *anyCondition) Satisfied() bool {
return ac.satisfied(false)
}
type negatedCondition struct {
other Condition
}
func NewNegatedCondition(other Condition) Condition {
return &negatedCondition{other}
}
func (nc *negatedCondition) Value() interface{} {
return nc.Satisfied()
}
func (nc *negatedCondition) Satisfied() bool {
return !nc.other.Satisfied()
}
func (nc *negatedCondition) Changed() *Event {
return nc.other.Changed()
}
|
