FazBrowse GitHub Viewer
|
Trending
|
URL:
|
Home
Tools:
[Download Repo ZIP]
[View Raw Code]
[Original HTTPS Page]
SharpMap/SharpMap/Layers/VariableLayerCollection.cs at main · SharpMap/SharpMap · GitHub
SharpMap
SharpMap
Repository navigation
Code
Issues
42
(42)
Pull requests
6
(6)
Discussions
Actions
Projects
Wiki
Security and quality
Insights
Expand file tree
Breadcrumbs
SharpMap
/
SharpMap
/
Layers
/
VariableLayerCollection.cs
Copy path
More file actions
More file actions
Latest commit
History
History
History
194 lines (164 loc) · 6.12 KB
Breadcrumbs
SharpMap
/
SharpMap
/
Layers
/
VariableLayerCollection.cs
Copy path
File metadata and controls
194 lines (164 loc) · 6.12 KB
Raw
Copy raw file
Download raw file
Open symbols panel
Edit and raw actions
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
183
184
185
186
187
188
189
190
191
192
193
194
using
System
;
using
System
.
Collections
;
using
System
.
Collections
.
Generic
;
using
System
.
Runtime
.
Serialization
;
using
System
.
Timers
;
namespace
SharpMap
.
Layers
{
/// <summary>
/// Types of layer collections
/// </summary>
public
enum
LayerCollectionType
{
/// <summary>
/// Layer collection for layers with datasources that are more or less static (e.g ShapeFiles)
/// </summary>
Static
,
/// <summary>
/// Layer collection for layers with datasources that update frequently (e.g. moving vehicle)
/// </summary>
Variable
,
/// <summary>
/// Layer collection for layers are completely opaque and serve as Background (e.g. WMS, OSM)
/// </summary>
Background
,
}
/// <summary>
/// Signature of function to handle VariableLayerCollectionRequery event
/// </summary>
/// <param name="sender">The sender of the event</param>
/// <param name="e">The arguments, <c>EventArgs.Empty</c> in all cases</param>
public
delegate
void
VariableLayerCollectionRequeryHandler
(
object
sender
,
EventArgs
e
)
;
/// <summary>
/// Layer collection
/// </summary>
/// TODO:REEVALUEATE
[
Serializable
]
public
class
VariableLayerCollection
:
LayerCollection
{
//private readonly LayerCollection _variableLayers;
//[NonSerialized]
//private Timer _timer;
private
volatile
bool
_isQuerying
;
//[NonSerialized]
//private EventHandler<ElapsedEventArgs> _handler;
private
bool
_pause
;
/// <summary>
/// Method to restart the internal Timer
/// </summary>
public
void
TouchTimer
(
)
{
// check for pending re-draw (eg after map pan/zoom completed)
//if (_timer.Enabled) return;
if
(
_isQuerying
)
return
;
//_timer.Start();
foreach
(
var
lyr
in
this
)
{
if
(
lyr
is
ILayerEx
lyrEx
)
lyrEx
.
RaiseRenderRequired
(
)
;
}
System
.
Threading
.
ThreadPool
.
QueueUserWorkItem
(
new
System
.
Threading
.
WaitCallback
(
OnRequery
)
)
;
}
/// <summary>
/// Method called when deserializing this object.
/// </summary>
/// <param name="context"></param>
[
OnDeserializing
]
public
void
OnDeserializing
(
StreamingContext
context
)
{
//_timer = new Timer();
}
/// <summary>
/// Event fired every <see cref="Interval"/> to force requery;
/// </summary>
public
event
VariableLayerCollectionRequeryHandler
VariableLayerCollectionRequery
;
/// <summary>
/// Creates an instance of this class
/// </summary>
/// <param name="variableLayers">Layer collection that holds layers with data sources updating frequently</param>
public
VariableLayerCollection
(
LayerCollection
variableLayers
)
{
AddCollection
(
variableLayers
)
;
//_variableLayers = variableLayers;
//if (_handler == null)
//{
// //_timer = new Timer();
// //_timer.Interval = 500;
// //_timer.Elapsed += new ElapsedEventHandler(TimerElapsed);
//}
}
private
void
TimerElapsed
(
object
sender
,
ElapsedEventArgs
e
)
{
OnRequery
(
null
)
;
}
/// <inheritdoc/>
protected
override
void
InsertItem
(
int
index
,
ILayer
layer
)
{
if
(
layer
==
null
)
throw
new
ArgumentNullException
(
"layer"
,
"The passed argument is null or not an ILayer"
)
;
lock
(
(
(
ICollection
)
this
)
.
SyncRoot
)
{
TestLayerPresent
(
this
,
layer
)
;
base
.
InsertItem
(
index
,
layer
)
;
}
}
/*
protected override void OnAddingNew(System.ComponentModel.AddingNewEventArgs e)
{
ILayer newLayer = (e.NewObject as ILayer);
if (newLayer == null) throw new ArgumentNullException("value", "The passed argument is null or not an ILayer");
TestLayerPresent(_variableLayers, newLayer);
base.OnAddingNew(e);
}
*/
private
static
void
TestLayerPresent
(
IEnumerable
<
ILayer
>
layers
,
ILayer
newLayer
)
{
foreach
(
var
layer
in
layers
)
{
var
comparison
=
String
.
Compare
(
layer
.
LayerName
,
newLayer
.
LayerName
,
StringComparison
.
CurrentCultureIgnoreCase
)
;
if
(
comparison
==
0
)
throw
new
DuplicateLayerException
(
newLayer
.
LayerName
)
;
}
}
private
void
OnRequery
(
object
obj
)
{
// if pan/zoom operation in progress then retry on next _timer.Elapsed
if
(
Pause
)
return
;
// check for race condition when timer has been stopped while event has just been submitted on threadpool.QueueUserWorkItem
//if (!_timer.Enabled) return;
if
(
_isQuerying
)
return
;
//_timer.Stop();
_isQuerying
=
true
;
VariableLayerCollectionRequery
?
.
Invoke
(
this
,
EventArgs
.
Empty
)
;
_isQuerying
=
false
;
}
/// <summary>
/// Gets/sets the interval in which to update layers
/// </summary>
public
double
Interval
{
get
{
return
0
;
//_timer.Interval;
}
set
{
// map sets Interval == 0 when disposing, to prevent race condition
/*
if (value <= 0)
_timer.Stop();
else
_timer.Interval = value;
*/
}
}
/// <summary>
/// Gets/Sets whether this collection should currently be updated or not
/// </summary>
public
bool
Pause
{
get
{
return
_pause
;
}
set
{
_pause
=
value
;
}
}
}
}
Back
|
FazBrowse Home
|
New Git URL