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/* 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 } = require("resource://devtools/shared/protocol.js");
const {
simulatorSpec,
} = require("resource://devtools/shared/specs/accessibility.js");
const {
simulation: { COLOR_TRANSFORMATION_MATRICES },
} = require("resource://devtools/server/actors/accessibility/constants.js");
/**
* The SimulatorActor is responsible for setting color matrices
* based on the simulation type specified.
*/
class SimulatorActor extends Actor {
constructor(conn, targetActor) {
super(conn, simulatorSpec);
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() {
super.destroy();
this.disable();
this.targetActor = null;
}
get docShell() {
return this.targetActor && this.targetActor.docShell;
}
}
exports.SimulatorActor = SimulatorActor;
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