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
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { Actor, ActorClassWithSpec } = require("devtools/shared/protocol");
const { simulatorSpec } = require("devtools/shared/specs/accessibility");
const {
simulation: { COLOR_TRANSFORMATION_MATRICES },
} = require("devtools/server/actors/accessibility/constants");
/**
* The SimulatorActor is responsible for setting color matrices
* based on the simulation type specified.
*/
const SimulatorActor = ActorClassWithSpec(simulatorSpec, {
initialize(conn, targetActor) {
Actor.prototype.initialize.call(this, conn);
this.targetActor = targetActor;
},
/**
* Simulates a type of visual impairment (i.e. color blindness or contrast loss).
*
* @param {Object} options
* Properties: {Array} types
* Contains the types of visual impairment(s) to be simulated.
* Set default color matrix if array is empty.
* @return {Boolean}
* True if matrix was successfully applied, false otherwise.
*/
simulate(options) {
if (options.types.length > 1) {
return false;
}
return this.setColorMatrix(
COLOR_TRANSFORMATION_MATRICES[
options.types.length === 1 ? options.types[0] : "NONE"
]
);
},
setColorMatrix(colorMatrix) {
if (!this.docShell) {
return false;
}
try {
this.docShell.setColorMatrix(colorMatrix);
} catch (error) {
return false;
}
return true;
},
/**
* Disables all simulations by setting the default color matrix.
*/
disable() {
this.simulate({ types: [] });
},
destroy() {
Actor.prototype.destroy.call(this);
this.disable();
this.targetActor = null;
},
get docShell() {
return this.targetActor && this.targetActor.docShell;
},
});
exports.SimulatorActor = SimulatorActor;
|
