forked from mirrors/gecko-dev
781 lines
24 KiB
JavaScript
781 lines
24 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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import { getFilename } from "chrome://browser/content/screenshots/fileHelpers.mjs";
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import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
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const lazy = {};
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ChromeUtils.defineESModuleGetters(lazy, {
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Downloads: "resource://gre/modules/Downloads.sys.mjs",
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FileUtils: "resource://gre/modules/FileUtils.sys.mjs",
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PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs",
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});
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XPCOMUtils.defineLazyServiceGetters(lazy, {
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AlertsService: ["@mozilla.org/alerts-service;1", "nsIAlertsService"],
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});
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ChromeUtils.defineLazyGetter(lazy, "screenshotsLocalization", () => {
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return new Localization(["browser/screenshots.ftl"], true);
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});
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const PanelPosition = "bottomright topright";
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const PanelOffsetX = -33;
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const PanelOffsetY = -8;
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// The max dimension for a canvas is 32,767 https://searchfox.org/mozilla-central/rev/f40d29a11f2eb4685256b59934e637012ea6fb78/gfx/cairo/cairo/src/cairo-image-surface.c#62.
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// The max number of pixels for a canvas is 472,907,776 pixels (i.e., 22,528 x 20,992) https://developer.mozilla.org/en-US/docs/Web/HTML/Element/canvas#maximum_canvas_size
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// We have to limit screenshots to these dimensions otherwise it will cause an error.
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export const MAX_CAPTURE_DIMENSION = 32766;
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export const MAX_CAPTURE_AREA = 472907776;
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export const MAX_SNAPSHOT_DIMENSION = 1024;
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export class ScreenshotsComponentParent extends JSWindowActorParent {
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async receiveMessage(message) {
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let browser = message.target.browsingContext.topFrameElement;
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let region, title;
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switch (message.name) {
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case "Screenshots:CancelScreenshot":
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let { reason } = message.data;
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ScreenshotsUtils.cancel(browser, reason);
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break;
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case "Screenshots:CopyScreenshot":
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ScreenshotsUtils.closePanel(browser);
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({ region } = message.data);
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await ScreenshotsUtils.copyScreenshotFromRegion(region, browser);
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ScreenshotsUtils.exit(browser);
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break;
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case "Screenshots:DownloadScreenshot":
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ScreenshotsUtils.closePanel(browser);
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({ title, region } = message.data);
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await ScreenshotsUtils.downloadScreenshotFromRegion(
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title,
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region,
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browser
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);
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ScreenshotsUtils.exit(browser);
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break;
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case "Screenshots:OverlaySelection":
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ScreenshotsUtils.setPerBrowserState(browser, {
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hasOverlaySelection: message.data.hasSelection,
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});
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break;
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case "Screenshots:ShowPanel":
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ScreenshotsUtils.openPanel(browser);
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break;
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case "Screenshots:HidePanel":
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ScreenshotsUtils.closePanel(browser);
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break;
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}
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}
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didDestroy() {
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// When restoring a crashed tab the browser is null
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let browser = this.browsingContext.topFrameElement;
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if (browser) {
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ScreenshotsUtils.exit(browser);
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}
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}
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}
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export const UIPhases = {
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CLOSED: 0, // nothing showing
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INITIAL: 1, // panel and overlay showing
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OVERLAYSELECTION: 2, // something selected in the overlay
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PREVIEW: 3, // preview dialog showing
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};
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export var ScreenshotsUtils = {
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browserToScreenshotsState: new WeakMap(),
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initialized: false,
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/**
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* Figures out which of various states the screenshots UI is in, for the given browser.
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* @param browser The selected browser
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* @returns One of the `UIPhases` constants
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*/
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getUIPhase(browser) {
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let perBrowserState = this.browserToScreenshotsState.get(browser);
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if (perBrowserState?.previewDialog) {
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return UIPhases.PREVIEW;
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}
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const buttonsPanel = this.panelForBrowser(browser);
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if (buttonsPanel && buttonsPanel.state !== "closed") {
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return UIPhases.INITIAL;
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}
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if (perBrowserState?.hasOverlaySelection) {
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return UIPhases.OVERLAYSELECTION;
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}
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return UIPhases.CLOSED;
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},
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initialize() {
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if (!this.initialized) {
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if (
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!Services.prefs.getBoolPref(
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"screenshots.browser.component.enabled",
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false
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)
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) {
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return;
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}
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Services.telemetry.setEventRecordingEnabled("screenshots", true);
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Services.obs.addObserver(this, "menuitem-screenshot");
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Services.obs.addObserver(this, "screenshots-take-screenshot");
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this.initialized = true;
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if (Cu.isInAutomation) {
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Services.obs.notifyObservers(null, "screenshots-component-initialized");
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}
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}
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},
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uninitialize() {
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if (this.initialized) {
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Services.obs.removeObserver(this, "menuitem-screenshot");
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Services.obs.removeObserver(this, "screenshots-take-screenshot");
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this.initialized = false;
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}
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},
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handleEvent(event) {
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// Escape should cancel and exit
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if (event.type === "keydown" && event.key === "Escape") {
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let browser = event.view.gBrowser.selectedBrowser;
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this.cancel(browser, "escape");
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}
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},
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observe(subj, topic, data) {
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let { gBrowser } = subj;
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let browser = gBrowser.selectedBrowser;
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switch (topic) {
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case "menuitem-screenshot": {
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const uiPhase = this.getUIPhase(browser);
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if (uiPhase !== UIPhases.CLOSED) {
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// toggle from already-open to closed
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this.cancel(browser, data);
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return;
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}
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this.start(browser, data);
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break;
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}
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case "screenshots-take-screenshot": {
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this.closePanel(browser);
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this.closeOverlay(browser);
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// init UI as a tab dialog box
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this.openPreviewDialog(browser).then(dialog => {
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this.doScreenshot(browser, dialog, data);
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});
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break;
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}
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}
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},
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/**
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* Notify screenshots when screenshot command is used.
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* @param window The current window the screenshot command was used.
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* @param type The type of screenshot taken. Used for telemetry.
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*/
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notify(window, type) {
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if (Services.prefs.getBoolPref("screenshots.browser.component.enabled")) {
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Services.obs.notifyObservers(
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window.event.currentTarget.ownerGlobal,
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"menuitem-screenshot",
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type
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);
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} else {
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Services.obs.notifyObservers(null, "menuitem-screenshot-extension", type);
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}
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},
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/**
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* Creates/gets and returns a Screenshots actor.
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* @param browser The current browser.
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* @returns JSWindowActor The screenshot actor.
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*/
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getActor(browser) {
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let actor = browser.browsingContext.currentWindowGlobal.getActor(
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"ScreenshotsComponent"
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);
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return actor;
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},
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/**
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* Show the Screenshots UI and start the capture flow
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* @param browser The current browser.
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* @param reason [string] Optional reason string passed along when recording telemetry events
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*/
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start(browser, reason = "") {
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const uiPhase = this.getUIPhase(browser);
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switch (uiPhase) {
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case UIPhases.CLOSED:
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this.showPanelAndOverlay(browser, reason);
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break;
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case UIPhases.INITIAL:
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// nothing to do, panel & overlay are already open
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break;
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case UIPhases.PREVIEW: {
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this.closeDialogBox(browser);
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this.showPanelAndOverlay(browser, reason);
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break;
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}
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}
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},
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/**
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* Exit the Screenshots UI for the given browser
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* Closes any of open UI elements (preview dialog, panel, overlay) and cleans up internal state.
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* @param browser The current browser.
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*/
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exit(browser) {
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this.closeDialogBox(browser);
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this.closePanel(browser);
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this.closeOverlay(browser);
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this.browserToScreenshotsState.delete(browser);
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if (Cu.isInAutomation) {
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Services.obs.notifyObservers(null, "screenshots-exit");
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}
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},
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/**
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* Cancel/abort the screenshots operation for the given browser
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* @param browser The current browser.
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*/
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cancel(browser, reason) {
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this.recordTelemetryEvent("canceled", reason, {});
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this.exit(browser);
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},
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/**
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* Update internal UI state associated with the given browser
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* @param browser The current browser.
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* @param nameValues {object} An object with one or more named property values
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*/
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setPerBrowserState(browser, nameValues = {}) {
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if (!this.browserToScreenshotsState.has(browser)) {
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// we should really have this state already, created when the preview dialog was opened
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this.browserToScreenshotsState.set(browser, {});
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}
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let perBrowserState = this.browserToScreenshotsState.get(browser);
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Object.assign(perBrowserState, nameValues);
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},
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/**
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* Set a flag so we don't try to exit when preview dialog next closes.
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* @param browser The current browser.
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* @param reason [string] Optional reason string passed along when recording telemetry events
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*/
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scheduleRetry(browser, reason) {
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let perBrowserState = this.browserToScreenshotsState.get(browser);
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if (!perBrowserState?.closedPromise) {
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console.warn(
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"Expected perBrowserState with a closedPromise for the preview dialog"
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);
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return;
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}
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this.setPerBrowserState(browser, { exitOnPreviewClose: false });
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perBrowserState?.closedPromise.then(() => {
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this.start(browser, reason);
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});
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},
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/**
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* Open the tab dialog for preview
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* @param browser The current browser
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*/
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async openPreviewDialog(browser) {
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let dialogBox = browser.ownerGlobal.gBrowser.getTabDialogBox(browser);
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let { dialog, closedPromise } = await dialogBox.open(
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`chrome://browser/content/screenshots/screenshots.html?browsingContextId=${browser.browsingContext.id}`,
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{
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features: "resizable=no",
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sizeTo: "available",
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allowDuplicateDialogs: false,
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},
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browser
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);
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this.setPerBrowserState(browser, {
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previewDialog: dialog,
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exitOnPreviewClose: true,
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closedPromise: closedPromise.finally(() => {
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this.onDialogClose(browser);
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}),
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});
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return dialog;
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},
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/**
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* Returns the buttons panel for the given browser
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* @param browser The current browser
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* @returns The buttons panel
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*/
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panelForBrowser(browser) {
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return browser.ownerDocument.getElementById("screenshotsPagePanel");
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},
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/**
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* Create the buttons container from its template, for this browser
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* @param browser The current browser
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* @returns The buttons panel
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*/
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createPanelForBrowser(browser) {
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let buttonsPanel = this.panelForBrowser(browser);
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if (!buttonsPanel) {
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let doc = browser.ownerDocument;
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let template = doc.getElementById("screenshotsPagePanelTemplate");
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let clone = template.content.cloneNode(true);
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template.replaceWith(clone);
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}
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return this.panelForBrowser(browser);
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},
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/**
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* Open the buttons panel.
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* @param browser The current browser
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*/
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async openPanel(browser) {
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let buttonsPanel = this.panelForBrowser(browser);
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if (buttonsPanel.state !== "closed") {
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return;
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}
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buttonsPanel.ownerDocument.addEventListener("keydown", this);
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let anchor = browser.ownerDocument.getElementById("navigator-toolbox");
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buttonsPanel.openPopup(anchor, PanelPosition, PanelOffsetX, PanelOffsetY);
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if (buttonsPanel.state !== "open") {
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await new Promise(resolve => {
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buttonsPanel.addEventListener("popupshown", resolve, { once: true });
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});
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}
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buttonsPanel
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.querySelector("screenshots-buttons")
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.focusFirst({ focusVisible: true });
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},
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/**
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* Close the panel
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* @param browser The current browser
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*/
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closePanel(browser) {
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let buttonsPanel = this.panelForBrowser(browser);
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if (!buttonsPanel) {
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return;
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}
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if (buttonsPanel.state !== "closed") {
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buttonsPanel.hidePopup();
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}
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buttonsPanel.ownerDocument.removeEventListener("keydown", this);
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},
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/**
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* If the buttons panel exists and is open we will hide both the panel
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* and the overlay. If the overlay is showing, we will hide the overlay.
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* Otherwise create or display the buttons.
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* @param browser The current browser.
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*/
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async showPanelAndOverlay(browser, data) {
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let actor = this.getActor(browser);
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actor.sendAsyncMessage("Screenshots:ShowOverlay");
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this.createPanelForBrowser(browser);
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this.recordTelemetryEvent("started", data, {});
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await this.openPanel(browser);
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},
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/**
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* Close the overlay UI, and clear out internal state if there was an overlay selection
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* The overlay lives in the child document; so although closing is actually async, we assume success.
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* @param browser The current browser.
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*/
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closeOverlay(browser) {
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let actor = this.getActor(browser);
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actor?.sendAsyncMessage("Screenshots:HideOverlay");
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if (this.browserToScreenshotsState.has(browser)) {
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this.setPerBrowserState(browser, {
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hasOverlaySelection: false,
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});
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}
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},
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/**
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* Gets the screenshots dialog box
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* @param browser The selected browser
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* @returns Screenshots dialog box if it exists otherwise null
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*/
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getDialog(browser) {
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let currTabDialogBox = browser.tabDialogBox;
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let browserContextId = browser.browsingContext.id;
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if (currTabDialogBox) {
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currTabDialogBox.getTabDialogManager();
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let manager = currTabDialogBox.getTabDialogManager();
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let dialogs = manager.hasDialogs && manager.dialogs;
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if (dialogs.length) {
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for (let dialog of dialogs) {
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if (
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dialog._openedURL.endsWith(
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`browsingContextId=${browserContextId}`
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) &&
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dialog._openedURL.includes("screenshots.html")
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) {
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return dialog;
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}
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}
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}
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}
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return null;
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},
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/**
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* Closes the dialog box it it exists
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* @param browser The selected browser
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*/
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closeDialogBox(browser) {
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let perBrowserState = this.browserToScreenshotsState.get(browser);
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if (perBrowserState?.previewDialog) {
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perBrowserState.previewDialog.close();
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return true;
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}
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return false;
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},
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/**
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* Callback fired when the preview dialog window closes
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* Will exit the screenshots UI if the `exitOnPreviewClose` flag is set for this browser
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* @param browser The associated browser
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*/
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onDialogClose(browser) {
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let perBrowserState = this.browserToScreenshotsState.get(browser);
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if (!perBrowserState) {
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return;
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}
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delete perBrowserState.previewDialog;
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if (perBrowserState?.exitOnPreviewClose) {
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this.exit(browser);
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}
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},
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/**
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* Gets the screenshots button if it is visible, otherwise it will get the
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* element that the screenshots button is nested under. If the screenshots
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* button doesn't exist then we will default to the navigator toolbox.
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* @param browser The selected browser
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* @returns The anchor element for the ConfirmationHint
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*/
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getWidgetAnchor(browser) {
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let window = browser.ownerGlobal;
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let widgetGroup = window.CustomizableUI.getWidget("screenshot-button");
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let widget = widgetGroup?.forWindow(window);
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let anchor = widget?.anchor;
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// Check if the anchor exists and is visible
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if (!anchor || !window.isElementVisible(anchor.parentNode)) {
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anchor = browser.ownerDocument.getElementById("navigator-toolbox");
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}
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return anchor;
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},
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/**
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* Indicate that the screenshot has been copied via ConfirmationHint.
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* @param browser The selected browser
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*/
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showCopiedConfirmationHint(browser) {
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let anchor = this.getWidgetAnchor(browser);
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browser.ownerGlobal.ConfirmationHint.show(
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anchor,
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"confirmation-hint-screenshot-copied"
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);
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},
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/**
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* Gets the full page bounds from the screenshots child actor.
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* @param browser The current browser.
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* @returns { object }
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* Contains the full page bounds from the screenshots child actor.
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*/
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fetchFullPageBounds(browser) {
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let actor = this.getActor(browser);
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return actor.sendQuery("Screenshots:getFullPageBounds");
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},
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/**
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* Gets the visible bounds from the screenshots child actor.
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* @param browser The current browser.
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* @returns { object }
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* Contains the visible bounds from the screenshots child actor.
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*/
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fetchVisibleBounds(browser) {
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let actor = this.getActor(browser);
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return actor.sendQuery("Screenshots:getVisibleBounds");
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},
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showAlertMessage(title, message) {
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lazy.AlertsService.showAlertNotification(null, title, message);
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},
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/**
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* The max dimension of any side of a canvas is 32767 and the max canvas area is
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* 124925329. If the width or height is greater or equal to 32766 we will crop the
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* screenshot to the max width. If the area is still too large for the canvas
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* we will adjust the height so we can successfully capture the screenshot.
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* @param {Object} rect The dimensions of the screenshot. The rect will be
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* modified in place
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*/
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cropScreenshotRectIfNeeded(rect) {
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let cropped = false;
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let width = rect.width * rect.devicePixelRatio;
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let height = rect.height * rect.devicePixelRatio;
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if (width > MAX_CAPTURE_DIMENSION) {
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width = MAX_CAPTURE_DIMENSION;
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cropped = true;
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}
|
|
if (height > MAX_CAPTURE_DIMENSION) {
|
|
height = MAX_CAPTURE_DIMENSION;
|
|
cropped = true;
|
|
}
|
|
if (width * height > MAX_CAPTURE_AREA) {
|
|
height = Math.floor(MAX_CAPTURE_AREA / width);
|
|
cropped = true;
|
|
}
|
|
|
|
rect.width = Math.floor(width / rect.devicePixelRatio);
|
|
rect.height = Math.floor(height / rect.devicePixelRatio);
|
|
rect.right = rect.left + rect.width;
|
|
rect.bottom = rect.top + rect.height;
|
|
|
|
if (cropped) {
|
|
let [errorTitle, errorMessage] =
|
|
lazy.screenshotsLocalization.formatMessagesSync([
|
|
{ id: "screenshots-too-large-error-title" },
|
|
{ id: "screenshots-too-large-error-details" },
|
|
]);
|
|
this.showAlertMessage(errorTitle.value, errorMessage.value);
|
|
this.recordTelemetryEvent("failed", "screenshot_too_large", null);
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Add screenshot-ui to the dialog box and then take the screenshot
|
|
* @param browser The current browser.
|
|
* @param dialog The dialog box to show the screenshot preview.
|
|
* @param type The type of screenshot taken.
|
|
*/
|
|
async doScreenshot(browser, dialog, type) {
|
|
await dialog._dialogReady;
|
|
let screenshotsUI =
|
|
dialog._frame.contentDocument.createElement("screenshots-ui");
|
|
dialog._frame.contentDocument.body.appendChild(screenshotsUI);
|
|
|
|
let rect;
|
|
if (type === "full-page") {
|
|
rect = await this.fetchFullPageBounds(browser);
|
|
type = "full_page";
|
|
} else {
|
|
rect = await this.fetchVisibleBounds(browser);
|
|
}
|
|
this.recordTelemetryEvent("selected", type, {});
|
|
return this.takeScreenshot(browser, dialog, rect);
|
|
},
|
|
|
|
/**
|
|
* Take the screenshot and add the image to the dialog box
|
|
* @param browser The current browser.
|
|
* @param dialog The dialog box to show the screenshot preview.
|
|
* @param rect DOMRect containing bounds of the screenshot.
|
|
*/
|
|
async takeScreenshot(browser, dialog, rect) {
|
|
let canvas = await this.createCanvas(rect, browser);
|
|
|
|
let newImg = dialog._frame.contentDocument.createElement("img");
|
|
let url = canvas.toDataURL();
|
|
|
|
newImg.id = "placeholder-image";
|
|
|
|
newImg.src = url;
|
|
dialog._frame.contentDocument
|
|
.getElementById("preview-image-div")
|
|
.appendChild(newImg);
|
|
|
|
if (Cu.isInAutomation) {
|
|
Services.obs.notifyObservers(null, "screenshots-preview-ready");
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Creates a canvas and draws a snapshot of the screenshot on the canvas
|
|
* @param region The bounds of screenshots
|
|
* @param browser The current browser
|
|
* @returns The canvas
|
|
*/
|
|
async createCanvas(region, browser) {
|
|
this.cropScreenshotRectIfNeeded(region);
|
|
|
|
let { devicePixelRatio } = region;
|
|
|
|
let browsingContext = BrowsingContext.get(browser.browsingContext.id);
|
|
|
|
let canvas = browser.ownerDocument.createElementNS(
|
|
"http://www.w3.org/1999/xhtml",
|
|
"html:canvas"
|
|
);
|
|
let context = canvas.getContext("2d");
|
|
|
|
canvas.width = region.width * devicePixelRatio;
|
|
canvas.height = region.height * devicePixelRatio;
|
|
|
|
for (
|
|
let startLeft = region.left;
|
|
startLeft < region.right;
|
|
startLeft += MAX_SNAPSHOT_DIMENSION
|
|
) {
|
|
for (
|
|
let startTop = region.top;
|
|
startTop < region.bottom;
|
|
startTop += MAX_SNAPSHOT_DIMENSION
|
|
) {
|
|
let height =
|
|
startTop + MAX_SNAPSHOT_DIMENSION > region.bottom
|
|
? region.bottom - startTop
|
|
: MAX_SNAPSHOT_DIMENSION;
|
|
let width =
|
|
startLeft + MAX_SNAPSHOT_DIMENSION > region.right
|
|
? region.right - startLeft
|
|
: MAX_SNAPSHOT_DIMENSION;
|
|
let rect = new DOMRect(startLeft, startTop, width, height);
|
|
|
|
let snapshot = await browsingContext.currentWindowGlobal.drawSnapshot(
|
|
rect,
|
|
devicePixelRatio,
|
|
"rgb(255,255,255)"
|
|
);
|
|
|
|
context.drawImage(
|
|
snapshot,
|
|
(startLeft - region.left) * devicePixelRatio,
|
|
(startTop - region.top) * devicePixelRatio,
|
|
width * devicePixelRatio,
|
|
height * devicePixelRatio
|
|
);
|
|
|
|
snapshot.close();
|
|
}
|
|
}
|
|
|
|
return canvas;
|
|
},
|
|
|
|
/**
|
|
* Copy the screenshot
|
|
* @param region The bounds of the screenshots
|
|
* @param browser The current browser
|
|
*/
|
|
async copyScreenshotFromRegion(region, browser) {
|
|
let canvas = await this.createCanvas(region, browser);
|
|
let url = canvas.toDataURL();
|
|
|
|
this.copyScreenshot(url, browser);
|
|
|
|
this.recordTelemetryEvent("copy", "overlay_copy", {});
|
|
},
|
|
|
|
/**
|
|
* Copy the image to the clipboard
|
|
* @param dataUrl The image data
|
|
* @param browser The current browser
|
|
*/
|
|
copyScreenshot(dataUrl, browser) {
|
|
// Guard against missing image data.
|
|
if (!dataUrl) {
|
|
return;
|
|
}
|
|
|
|
const imageTools = Cc["@mozilla.org/image/tools;1"].getService(
|
|
Ci.imgITools
|
|
);
|
|
|
|
const base64Data = dataUrl.replace("data:image/png;base64,", "");
|
|
|
|
const image = atob(base64Data);
|
|
const imgDecoded = imageTools.decodeImageFromBuffer(
|
|
image,
|
|
image.length,
|
|
"image/png"
|
|
);
|
|
|
|
const transferable = Cc[
|
|
"@mozilla.org/widget/transferable;1"
|
|
].createInstance(Ci.nsITransferable);
|
|
transferable.init(null);
|
|
transferable.addDataFlavor("image/png");
|
|
transferable.setTransferData("image/png", imgDecoded);
|
|
|
|
Services.clipboard.setData(
|
|
transferable,
|
|
null,
|
|
Services.clipboard.kGlobalClipboard
|
|
);
|
|
|
|
this.showCopiedConfirmationHint(browser);
|
|
},
|
|
|
|
/**
|
|
* Download the screenshot
|
|
* @param title The title of the current page
|
|
* @param region The bounds of the screenshot
|
|
* @param browser The current browser
|
|
*/
|
|
async downloadScreenshotFromRegion(title, region, browser) {
|
|
let canvas = await this.createCanvas(region, browser);
|
|
let dataUrl = canvas.toDataURL();
|
|
|
|
await this.downloadScreenshot(title, dataUrl, browser);
|
|
|
|
this.recordTelemetryEvent("download", "overlay_download", {});
|
|
},
|
|
|
|
/**
|
|
* Download the screenshot
|
|
* @param title The title of the current page or null and getFilename will get the title
|
|
* @param dataUrl The image data
|
|
* @param browser The current browser
|
|
*/
|
|
async downloadScreenshot(title, dataUrl, browser) {
|
|
// Guard against missing image data.
|
|
if (!dataUrl) {
|
|
return;
|
|
}
|
|
|
|
let filename = await getFilename(title, browser);
|
|
|
|
const targetFile = new lazy.FileUtils.File(filename);
|
|
|
|
// Create download and track its progress.
|
|
try {
|
|
const download = await lazy.Downloads.createDownload({
|
|
source: dataUrl,
|
|
target: targetFile,
|
|
});
|
|
|
|
let isPrivate = lazy.PrivateBrowsingUtils.isWindowPrivate(
|
|
browser.ownerGlobal
|
|
);
|
|
const list = await lazy.Downloads.getList(
|
|
isPrivate ? lazy.Downloads.PRIVATE : lazy.Downloads.PUBLIC
|
|
);
|
|
// add the download to the download list in the Downloads list in the Browser UI
|
|
list.add(download);
|
|
|
|
// Await successful completion of the save via the download manager
|
|
await download.start();
|
|
} catch (ex) {}
|
|
},
|
|
|
|
recordTelemetryEvent(type, object, args) {
|
|
Services.telemetry.recordEvent("screenshots", type, object, null, args);
|
|
},
|
|
};
|