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Re-factor the EventBus and isInAutomation handling (PR 11655 follow-up)

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Rather than forcing the "regular" `EventBus` to check and handle `isInAutomation` for every `dispatch` call, we can take advantage of subclassing instead.
Hence this PR introduces a new `AutomationEventBus` class, which extends `EventBus`, and is used by the default viewer when `isInAutomation === true`.
This commit is contained in:
Jonas Jenwald 2021-09-17 18:17:40 +02:00
parent 7082ff9bf8
commit 0e92f995c9
3 changed files with 45 additions and 51 deletions
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76
web/ui_utils.js
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@ -708,43 +708,13 @@ const animationStarted = new Promise(function (resolve) {
window.requestAnimationFrame(resolve);
});
/**
* NOTE: Only used to support various PDF viewer tests in `mozilla-central`.
*/
function dispatchDOMEvent(eventName, args = null) {
if (typeof PDFJSDev !== "undefined" && !PDFJSDev.test("MOZCENTRAL")) {
throw new Error("Not implemented: dispatchDOMEvent");
}
const details = Object.create(null);
if (args?.length > 0) {
const obj = args[0];
for (const key in obj) {
const value = obj[key];
if (key === "source") {
if (value === window || value === document) {
return; // No need to re-dispatch (already) global events.
}
continue; // Ignore the `source` property.
}
details[key] = value;
}
}
const event = document.createEvent("CustomEvent");
event.initCustomEvent(eventName, true, true, details);
document.dispatchEvent(event);
}
/**
* Simple event bus for an application. Listeners are attached using the `on`
* and `off` methods. To raise an event, the `dispatch` method shall be used.
*/
class EventBus {
constructor(options) {
constructor() {
this._listeners = Object.create(null);
if (typeof PDFJSDev === "undefined" || PDFJSDev.test("MOZCENTRAL")) {
this._isInAutomation = options?.isInAutomation === true;
}
}
/**
@ -774,13 +744,6 @@ class EventBus {
dispatch(eventName) {
const eventListeners = this._listeners[eventName];
if (!eventListeners || eventListeners.length === 0) {
if (
(typeof PDFJSDev === "undefined" || PDFJSDev.test("MOZCENTRAL")) &&
this._isInAutomation
) {
const args = Array.prototype.slice.call(arguments, 1);
dispatchDOMEvent(eventName, args);
}
return;
}
// Passing all arguments after the eventName to the listeners.
@ -806,12 +769,6 @@ class EventBus {
}
externalListeners = null;
}
if (
(typeof PDFJSDev === "undefined" || PDFJSDev.test("MOZCENTRAL")) &&
this._isInAutomation
) {
dispatchDOMEvent(eventName, args);
}
}
/**
@ -843,6 +800,36 @@ class EventBus {
}
}
/**
* NOTE: Only used to support various PDF viewer tests in `mozilla-central`.
*/
class AutomationEventBus extends EventBus {
dispatch(eventName) {
if (typeof PDFJSDev !== "undefined" && !PDFJSDev.test("MOZCENTRAL")) {
throw new Error("Not implemented: AutomationEventBus.dispatch");
}
super.dispatch(...arguments);
const details = Object.create(null);
if (arguments.length > 1) {
const obj = arguments[1];
for (const key in obj) {
const value = obj[key];
if (key === "source") {
if (value === window || value === document) {
return; // No need to re-dispatch (already) global events.
}
continue; // Ignore the `source` property.
}
details[key] = value;
}
}
const event = document.createEvent("CustomEvent");
event.initCustomEvent(eventName, true, true, details);
document.dispatchEvent(event);
}
}
function clamp(v, min, max) {
return Math.min(Math.max(v, min), max);
}
@ -1012,6 +999,7 @@ export {
apiPageLayoutToSpreadMode,
apiPageModeToSidebarView,
approximateFraction,
AutomationEventBus,
AutoPrintRegExp,
backtrackBeforeAllVisibleElements, // only exported for testing
binarySearchFirstItem,