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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 {
TYPES: { STYLESHEET },
} = require("resource://devtools/server/actors/resources/index.js");
loader.lazyRequireGetter(
this,
"CssLogic",
"resource://devtools/shared/inspector/css-logic.js"
);
class StyleSheetWatcher {
constructor() {
this._onApplicableStylesheetAdded =
this._onApplicableStylesheetAdded.bind(this);
this._onStylesheetUpdated = this._onStylesheetUpdated.bind(this);
}
/**
* Start watching for all stylesheets related to a given Target Actor.
*
* @param TargetActor targetActor
* The target actor from which we should observe css changes.
* @param Object options
* Dictionary object with following attributes:
* - onAvailable: mandatory function
* This will be called for each resource.
*/
async watch(targetActor, { onAvailable, onUpdated }) {
this._targetActor = targetActor;
this._onAvailable = onAvailable;
this._onUpdated = onUpdated;
this._styleSheetsManager = targetActor.getStyleSheetsManager();
// Add event listener for new additions and updates
this._styleSheetsManager.on(
"applicable-stylesheet-added",
this._onApplicableStylesheetAdded
);
this._styleSheetsManager.on(
"stylesheet-updated",
this._onStylesheetUpdated
);
// startWatching will emit applicable-stylesheet-added for already existing stylesheet
await this._styleSheetsManager.startWatching();
}
_onApplicableStylesheetAdded(styleSheetData) {
return this._notifyResourcesAvailable([styleSheetData]);
}
_onStylesheetUpdated({ resourceId, updateKind, updates = {} }) {
this._notifyResourceUpdated(resourceId, updateKind, updates);
}
async _toResource(
styleSheet,
{ isCreatedByDevTools = false, fileName = null, resourceId } = {}
) {
const resource = {
resourceId,
resourceType: STYLESHEET,
disabled: styleSheet.disabled,
constructed: styleSheet.constructed,
fileName,
href: styleSheet.href,
isNew: isCreatedByDevTools,
atRules: await this._styleSheetsManager.getAtRules(styleSheet),
nodeHref: this._styleSheetsManager._getNodeHref(styleSheet),
ruleCount: styleSheet.cssRules.length,
sourceMapBaseURL:
this._styleSheetsManager._getSourcemapBaseURL(styleSheet),
sourceMapURL: styleSheet.sourceMapURL,
styleSheetIndex: this._styleSheetsManager._getStyleSheetIndex(styleSheet),
system: CssLogic.isAgentStylesheet(styleSheet),
title: styleSheet.title,
};
return resource;
}
async _notifyResourcesAvailable(styleSheets) {
const resources = await Promise.all(
styleSheets.map(async ({ resourceId, styleSheet, creationData }) => {
const resource = await this._toResource(styleSheet, {
resourceId,
isCreatedByDevTools: creationData?.isCreatedByDevTools,
fileName: creationData?.fileName,
});
return resource;
})
);
await this._onAvailable(resources);
}
_notifyResourceUpdated(
resourceId,
updateType,
{ resourceUpdates, nestedResourceUpdates, event }
) {
this._onUpdated([
{
browsingContextID: this._targetActor.browsingContextID,
innerWindowId: this._targetActor.innerWindowId,
resourceType: STYLESHEET,
resourceId,
updateType,
resourceUpdates,
nestedResourceUpdates,
event,
},
]);
}
destroy() {
this._styleSheetsManager.off(
"applicable-stylesheet-added",
this._onApplicableStylesheetAdded
);
this._styleSheetsManager.off(
"stylesheet-updated",
this._onStylesheetUpdated
);
}
}
module.exports = StyleSheetWatcher;
|
