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
|
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file contains the definition for CppBindingExample, which is used in
// cpp_bound_class_unittest.
#include "cpp_binding_example.h"
namespace {
class PropertyCallbackExample : public CppBoundClass::PropertyCallback {
public:
virtual bool GetValue(CppVariant* value) {
value->Set(value_);
return true;
}
virtual bool SetValue(const CppVariant& value) {
value_.Set(value);
return true;
}
private:
CppVariant value_;
};
}
CppBindingExample::CppBindingExample() {
// Map properties. It's recommended, but not required, that the JavaScript
// names (used as the keys in this map) match the names of the member
// variables exposed through those names.
BindProperty("my_value", &my_value);
BindProperty("my_other_value", &my_other_value);
// Bind property with a callback.
BindProperty("my_value_with_callback", new PropertyCallbackExample());
// Bind property with a getter callback.
BindProperty("same", &CppBindingExample::same);
// Map methods. See comment above about names.
BindMethod("echoValue", &CppBindingExample::echoValue);
BindMethod("echoType", &CppBindingExample::echoType);
BindMethod("plus", &CppBindingExample::plus);
// The fallback method is called when a nonexistent method is called on an
// object. If none is specified, calling a nonexistent method causes an
// exception to be thrown and the JavaScript execution is stopped.
BindFallbackMethod(&CppBindingExample::fallbackMethod);
my_value.Set(10);
my_other_value.Set("Reinitialized!");
}
void CppBindingExample::echoValue(const CppArgumentList& args,
CppVariant* result) {
if (args.size() < 1) {
result->SetNull();
return;
}
result->Set(args[0]);
}
void CppBindingExample::echoType(const CppArgumentList& args,
CppVariant* result) {
if (args.size() < 1) {
result->SetNull();
return;
}
// Note that if args[0] is a string, the following assignment implicitly
// makes a copy of that string, which may have an undesirable impact on
// performance.
CppVariant arg1 = args[0];
if (arg1.isBool())
result->Set(true);
else if (arg1.isInt32())
result->Set(7);
else if (arg1.isDouble())
result->Set(3.14159);
else if (arg1.isString())
result->Set("Success!");
}
void CppBindingExample::plus(const CppArgumentList& args,
CppVariant* result) {
if (args.size() < 2) {
result->SetNull();
return;
}
CppVariant arg1 = args[0];
CppVariant arg2 = args[1];
if (!arg1.isNumber() || !arg2.isNumber()) {
result->SetNull();
return;
}
// The value of a CppVariant may be read directly from its NPVariant struct.
// (However, it should only be set using one of the Set() functions.)
double sum = 0.;
if (arg1.isDouble())
sum += arg1.value.doubleValue;
else if (arg1.isInt32())
sum += arg1.value.intValue;
if (arg2.isDouble())
sum += arg2.value.doubleValue;
else if (arg2.isInt32())
sum += arg2.value.intValue;
result->Set(sum);
}
void CppBindingExample::same(CppVariant* result) {
result->Set(42);
}
void CppBindingExample::fallbackMethod(const CppArgumentList& args,
CppVariant* result) {
printf("Error: unknown JavaScript method invoked.\n");
}
|
