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| -rw-r--r-- | toolkit/modules/LightweightThemeConsumer.sys.mjs | 686 |
1 files changed, 686 insertions, 0 deletions
diff --git a/toolkit/modules/LightweightThemeConsumer.sys.mjs b/toolkit/modules/LightweightThemeConsumer.sys.mjs new file mode 100644 index 0000000000..4e825b14e5 --- /dev/null +++ b/toolkit/modules/LightweightThemeConsumer.sys.mjs @@ -0,0 +1,686 @@ +/* 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/. */ + +import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs"; + +import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs"; + +const lazy = {}; +// Get the theme variables from the app resource directory. +// This allows per-app variables. +ChromeUtils.defineESModuleGetters(lazy, { + NimbusFeatures: "resource://nimbus/ExperimentAPI.sys.mjs", + PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs", + ThemeContentPropertyList: "resource:///modules/ThemeVariableMap.sys.mjs", + ThemeVariableMap: "resource:///modules/ThemeVariableMap.sys.mjs", +}); + +// Whether the content and chrome areas should always use the same color +// scheme (unless user-overridden). Thunderbird uses this. +XPCOMUtils.defineLazyPreferenceGetter( + lazy, + "BROWSER_THEME_UNIFIED_COLOR_SCHEME", + "browser.theme.unified-color-scheme", + false +); + +const DEFAULT_THEME_ID = "default-theme@mozilla.org"; + +// On Linux, the default theme picks up the right colors from dark GTK themes. +const DEFAULT_THEME_RESPECTS_SYSTEM_COLOR_SCHEME = + AppConstants.platform == "linux"; + +const toolkitVariableMap = [ + [ + "--lwt-accent-color", + { + lwtProperty: "accentcolor", + processColor(rgbaChannels, element) { + if (!rgbaChannels || rgbaChannels.a == 0) { + return "white"; + } + // Remove the alpha channel + const { r, g, b } = rgbaChannels; + return `rgb(${r}, ${g}, ${b})`; + }, + }, + ], + [ + "--lwt-text-color", + { + lwtProperty: "textcolor", + processColor(rgbaChannels, element) { + if (!rgbaChannels) { + rgbaChannels = { r: 0, g: 0, b: 0 }; + } + // Remove the alpha channel + const { r, g, b } = rgbaChannels; + return `rgba(${r}, ${g}, ${b})`; + }, + }, + ], + [ + "--arrowpanel-background", + { + lwtProperty: "popup", + }, + ], + [ + "--arrowpanel-color", + { + lwtProperty: "popup_text", + }, + ], + [ + "--arrowpanel-border-color", + { + lwtProperty: "popup_border", + }, + ], + [ + "--toolbar-field-background-color", + { + lwtProperty: "toolbar_field", + }, + ], + [ + "--toolbar-field-color", + { + lwtProperty: "toolbar_field_text", + }, + ], + [ + "--toolbar-field-border-color", + { + lwtProperty: "toolbar_field_border", + }, + ], + [ + "--toolbar-field-focus-background-color", + { + lwtProperty: "toolbar_field_focus", + fallbackProperty: "toolbar_field", + processColor(rgbaChannels, element, propertyOverrides) { + if (!rgbaChannels) { + return null; + } + // Ensure minimum opacity as this is used behind address bar results. + const min_opacity = 0.9; + let { r, g, b, a } = rgbaChannels; + if (a < min_opacity) { + propertyOverrides.set( + "toolbar_field_text_focus", + _isColorDark(r, g, b) ? "white" : "black" + ); + return `rgba(${r}, ${g}, ${b}, ${min_opacity})`; + } + return `rgba(${r}, ${g}, ${b}, ${a})`; + }, + }, + ], + [ + "--toolbar-field-focus-color", + { + lwtProperty: "toolbar_field_text_focus", + fallbackProperty: "toolbar_field_text", + }, + ], + [ + "--toolbar-field-focus-border-color", + { + lwtProperty: "toolbar_field_border_focus", + }, + ], + [ + "--lwt-toolbar-field-highlight", + { + lwtProperty: "toolbar_field_highlight", + processColor(rgbaChannels, element) { + if (!rgbaChannels) { + return null; + } + const { r, g, b, a } = rgbaChannels; + return `rgba(${r}, ${g}, ${b}, ${a})`; + }, + }, + ], + [ + "--lwt-toolbar-field-highlight-text", + { + lwtProperty: "toolbar_field_highlight_text", + }, + ], +]; + +export function LightweightThemeConsumer(aDocument) { + this._doc = aDocument; + this._win = aDocument.defaultView; + this._winId = this._win.docShell.outerWindowID; + + Services.obs.addObserver(this, "lightweight-theme-styling-update"); + + this.darkThemeMediaQuery = this._win.matchMedia("(-moz-system-dark-theme)"); + this.darkThemeMediaQuery.addListener(this); + + const { LightweightThemeManager } = ChromeUtils.importESModule( + "resource://gre/modules/LightweightThemeManager.sys.mjs" + ); + this._update(LightweightThemeManager.themeData); + + this._win.addEventListener("unload", this, { once: true }); +} + +LightweightThemeConsumer.prototype = { + _lastData: null, + + observe(aSubject, aTopic, aData) { + if (aTopic != "lightweight-theme-styling-update") { + return; + } + + let data = aSubject.wrappedJSObject; + if (data.window && data.window !== this._winId) { + return; + } + + this._update(data); + }, + + handleEvent(aEvent) { + if (aEvent.target == this.darkThemeMediaQuery) { + this._update(this._lastData); + return; + } + + switch (aEvent.type) { + case "unload": + Services.obs.removeObserver(this, "lightweight-theme-styling-update"); + Services.ppmm.sharedData.delete(`theme/${this._winId}`); + this._win = this._doc = null; + if (this.darkThemeMediaQuery) { + this.darkThemeMediaQuery.removeListener(this); + this.darkThemeMediaQuery = null; + } + break; + } + }, + + _update(themeData) { + this._lastData = themeData; + + const hasDarkTheme = !!themeData.darkTheme; + let updateGlobalThemeData = true; + let useDarkTheme = (() => { + if (!hasDarkTheme) { + return false; + } + if (this.darkThemeMediaQuery?.matches) { + return ( + themeData.darkTheme.id != DEFAULT_THEME_ID || + !DEFAULT_THEME_RESPECTS_SYSTEM_COLOR_SCHEME + ); + } + + // If enabled, apply the dark theme variant to private browsing windows. + if ( + !lazy.NimbusFeatures.majorRelease2022.getVariable( + "feltPrivacyPBMDarkTheme" + ) || + !lazy.PrivateBrowsingUtils.isWindowPrivate(this._win) || + lazy.PrivateBrowsingUtils.permanentPrivateBrowsing + ) { + return false; + } + // When applying the dark theme for a PBM window we need to skip calling + // _determineToolbarAndContentTheme, because it applies the color scheme + // globally for all windows. Skipping this method also means we don't + // switch the content theme to dark. + updateGlobalThemeData = false; + return true; + })(); + + // If this is a per-window dark theme, set the color scheme override so + // child BrowsingContexts, such as embedded prompts, get themed + // appropriately. + // If not, reset the color scheme override field. This is required to reset + // the color scheme on theme switch. + if (this._win.browsingContext == this._win.browsingContext.top) { + if (useDarkTheme && !updateGlobalThemeData) { + this._win.browsingContext.prefersColorSchemeOverride = "dark"; + } else { + this._win.browsingContext.prefersColorSchemeOverride = "none"; + } + } + + let theme = useDarkTheme ? themeData.darkTheme : themeData.theme; + if (!theme) { + theme = { id: DEFAULT_THEME_ID }; + } + + let active = (this._active = Object.keys(theme).length); + + let root = this._doc.documentElement; + + if (active && theme.headerURL) { + root.setAttribute("lwtheme-image", "true"); + } else { + root.removeAttribute("lwtheme-image"); + } + + this._setExperiment(active, themeData.experiment, theme.experimental); + _setImage(this._win, root, active, "--lwt-header-image", theme.headerURL); + _setImage( + this._win, + root, + active, + "--lwt-additional-images", + theme.additionalBackgrounds + ); + _setProperties(root, active, theme); + + if (theme.id != DEFAULT_THEME_ID || useDarkTheme) { + if (updateGlobalThemeData) { + _determineToolbarAndContentTheme( + this._doc, + theme, + hasDarkTheme, + useDarkTheme + ); + } + root.setAttribute("lwtheme", "true"); + } else { + _determineToolbarAndContentTheme(this._doc, null); + root.removeAttribute("lwtheme"); + } + if (theme.id == DEFAULT_THEME_ID && useDarkTheme) { + root.setAttribute("lwt-default-theme-in-dark-mode", "true"); + } else { + root.removeAttribute("lwt-default-theme-in-dark-mode"); + } + + _setDarkModeAttributes(this._doc, root, theme._processedColors); + + let contentThemeData = _getContentProperties(this._doc, active, theme); + Services.ppmm.sharedData.set(`theme/${this._winId}`, contentThemeData); + // We flush sharedData because contentThemeData can be responsible for + // painting large background surfaces. If this data isn't delivered to the + // content process before about:home is painted, we will paint a default + // background and then replace it when sharedData syncs, causing flashing. + Services.ppmm.sharedData.flush(); + + this._win.dispatchEvent(new CustomEvent("windowlwthemeupdate")); + }, + + _setExperiment(active, experiment, properties) { + const root = this._doc.documentElement; + if (this._lastExperimentData) { + const { stylesheet, usedVariables } = this._lastExperimentData; + if (stylesheet) { + stylesheet.remove(); + } + if (usedVariables) { + for (const [variable] of usedVariables) { + _setProperty(root, false, variable); + } + } + } + + this._lastExperimentData = {}; + + if (!active || !experiment) { + return; + } + + let usedVariables = []; + if (properties.colors) { + for (const property in properties.colors) { + const cssVariable = experiment.colors[property]; + const value = _rgbaToString( + _cssColorToRGBA(root.ownerDocument, properties.colors[property]) + ); + usedVariables.push([cssVariable, value]); + } + } + + if (properties.images) { + for (const property in properties.images) { + const cssVariable = experiment.images[property]; + usedVariables.push([ + cssVariable, + `url(${properties.images[property]})`, + ]); + } + } + if (properties.properties) { + for (const property in properties.properties) { + const cssVariable = experiment.properties[property]; + usedVariables.push([cssVariable, properties.properties[property]]); + } + } + for (const [variable, value] of usedVariables) { + _setProperty(root, true, variable, value); + } + this._lastExperimentData.usedVariables = usedVariables; + + if (experiment.stylesheet) { + /* Stylesheet URLs are validated using WebExtension schemas */ + let stylesheetAttr = `href="${experiment.stylesheet}" type="text/css"`; + let stylesheet = this._doc.createProcessingInstruction( + "xml-stylesheet", + stylesheetAttr + ); + this._doc.insertBefore(stylesheet, root); + this._lastExperimentData.stylesheet = stylesheet; + } + }, +}; + +function _getContentProperties(doc, active, data) { + if (!active) { + return {}; + } + let properties = {}; + for (let property in data) { + if (lazy.ThemeContentPropertyList.includes(property)) { + properties[property] = _cssColorToRGBA(doc, data[property]); + } + } + if (data.experimental) { + for (const property in data.experimental.colors) { + if (lazy.ThemeContentPropertyList.includes(property)) { + properties[property] = _cssColorToRGBA( + doc, + data.experimental.colors[property] + ); + } + } + for (const property in data.experimental.images) { + if (lazy.ThemeContentPropertyList.includes(property)) { + properties[property] = `url(${data.experimental.images[property]})`; + } + } + for (const property in data.experimental.properties) { + if (lazy.ThemeContentPropertyList.includes(property)) { + properties[property] = data.experimental.properties[property]; + } + } + } + return properties; +} + +function _setImage(aWin, aRoot, aActive, aVariableName, aURLs) { + if (aURLs && !Array.isArray(aURLs)) { + aURLs = [aURLs]; + } + _setProperty( + aRoot, + aActive, + aVariableName, + aURLs && aURLs.map(v => `url(${aWin.CSS.escape(v)})`).join(", ") + ); +} + +function _setProperty(elem, active, variableName, value) { + if (active && value) { + elem.style.setProperty(variableName, value); + } else { + elem.style.removeProperty(variableName); + } +} + +function _determineToolbarAndContentTheme( + aDoc, + aTheme, + aHasDarkTheme = false, + aIsDarkTheme = false +) { + const kDark = 0; + const kLight = 1; + const kSystem = 2; + + const colors = aTheme?._processedColors; + function prefValue(aColor, aIsForeground = false) { + if (typeof aColor != "object") { + aColor = _cssColorToRGBA(aDoc, aColor); + } + return _isColorDark(aColor.r, aColor.g, aColor.b) == aIsForeground + ? kLight + : kDark; + } + + function colorSchemeValue(aColorScheme) { + if (!aColorScheme) { + return null; + } + switch (aColorScheme) { + case "light": + return kLight; + case "dark": + return kDark; + case "system": + return kSystem; + case "auto": + default: + break; + } + return null; + } + + let toolbarTheme = (function () { + if (!aTheme) { + if (!DEFAULT_THEME_RESPECTS_SYSTEM_COLOR_SCHEME) { + return kLight; + } + return kSystem; + } + let themeValue = colorSchemeValue(aTheme.color_scheme); + if (themeValue !== null) { + return themeValue; + } + if (aHasDarkTheme) { + return aIsDarkTheme ? kDark : kLight; + } + // We prefer looking at toolbar background first (if it's opaque) because + // some text colors can be dark enough for our heuristics, but still + // contrast well enough with a dark background, see bug 1743010. + if (colors.toolbarColor) { + let color = _cssColorToRGBA(aDoc, colors.toolbarColor); + if (color.a == 1) { + return prefValue(color); + } + } + if (colors.toolbar_text) { + return prefValue(colors.toolbar_text, /* aIsForeground = */ true); + } + // It'd seem sensible to try looking at the "frame" background (accentcolor), + // but we don't because some themes that use background images leave it to + // black, see bug 1741931. + // + // Fall back to black as per the textcolor processing above. + return prefValue(colors.textcolor || "black", /* aIsForeground = */ true); + })(); + + let contentTheme = (function () { + if (lazy.BROWSER_THEME_UNIFIED_COLOR_SCHEME) { + return toolbarTheme; + } + if (!aTheme) { + if (!DEFAULT_THEME_RESPECTS_SYSTEM_COLOR_SCHEME) { + return kLight; + } + return kSystem; + } + let themeValue = colorSchemeValue( + aTheme.content_color_scheme || aTheme.color_scheme + ); + if (themeValue !== null) { + return themeValue; + } + return kSystem; + })(); + + Services.prefs.setIntPref("browser.theme.toolbar-theme", toolbarTheme); + Services.prefs.setIntPref("browser.theme.content-theme", contentTheme); +} + +/** + * Sets dark mode attributes on root, if required. We must do this here, + * instead of in each color's processColor function, because multiple colors + * are considered. + * @param {Document} doc + * @param {Element} root + * @param {object} colors + * The `_processedColors` object from the object created for our theme. + */ +function _setDarkModeAttributes(doc, root, colors) { + { + let textColor = _cssColorToRGBA(doc, colors.textcolor); + if (textColor && !_isColorDark(textColor.r, textColor.g, textColor.b)) { + root.setAttribute("lwtheme-brighttext", "true"); + } else { + root.removeAttribute("lwtheme-brighttext"); + } + } + + if ( + _determineIfColorPairIsDark( + doc, + colors, + "toolbar_field_text", + "toolbar_field" + ) + ) { + root.setAttribute("lwt-toolbar-field-brighttext", "true"); + } else { + root.removeAttribute("lwt-toolbar-field-brighttext"); + } + + if ( + _determineIfColorPairIsDark( + doc, + colors, + "toolbar_field_text_focus", + "toolbar_field_focus" + ) + ) { + root.setAttribute("lwt-toolbar-field-focus-brighttext", "true"); + } else { + root.removeAttribute("lwt-toolbar-field-focus-brighttext"); + } + + if (_determineIfColorPairIsDark(doc, colors, "popup_text", "popup")) { + root.setAttribute("lwt-popup-brighttext", "true"); + } else { + root.removeAttribute("lwt-popup-brighttext"); + } +} + +/** + * Determines if a themed color pair should be considered to have a dark color + * scheme. We consider both the background and foreground (i.e. usually text) + * colors because some text colors can be dark enough for our heuristics, but + * still contrast well enough with a dark background + * @param {Document} doc + * @param {object} colors + * @param {string} foregroundElementId + * The key for the foreground element in `colors`. + * @param {string} backgroundElementId + * The key for the background element in `colors`. + * @returns {boolean} True if the element should be considered dark, false + * otherwise. + */ +function _determineIfColorPairIsDark( + doc, + colors, + textPropertyName, + backgroundPropertyName +) { + if (!colors[backgroundPropertyName] && !colors[textPropertyName]) { + // Handles the system theme. + return false; + } + + let color = _cssColorToRGBA(doc, colors[backgroundPropertyName]); + if (color && color.a == 1) { + return _isColorDark(color.r, color.g, color.b); + } + + color = _cssColorToRGBA(doc, colors[textPropertyName]); + if (!color) { + // Handles the case where a theme only provides a background color and it is + // semi-transparent. + return false; + } + + return !_isColorDark(color.r, color.g, color.b); +} + +function _setProperties(root, active, themeData) { + let propertyOverrides = new Map(); + let doc = root.ownerDocument; + + // Copy the theme into _processedColors. We'll replace values with processed + // colors if necessary. We copy because some colors (such as those used in + // content) are not processed here, but are referenced in places that check + // _processedColors. Copying means _processedColors will contain irrelevant + // properties like `id`. There aren't too many, so that's OK. + themeData._processedColors = { ...themeData }; + for (let map of [toolkitVariableMap, lazy.ThemeVariableMap]) { + for (let [cssVarName, definition] of map) { + const { + lwtProperty, + fallbackProperty, + optionalElementID, + processColor, + isColor = true, + } = definition; + let elem = optionalElementID + ? doc.getElementById(optionalElementID) + : root; + let val = propertyOverrides.get(lwtProperty) || themeData[lwtProperty]; + if (isColor) { + val = _cssColorToRGBA(doc, val); + if (!val && fallbackProperty) { + val = _cssColorToRGBA(doc, themeData[fallbackProperty]); + } + if (processColor) { + val = processColor(val, elem, propertyOverrides); + } else { + val = _rgbaToString(val); + } + } + + // Add processed color to themeData. + themeData._processedColors[lwtProperty] = val; + + _setProperty(elem, active, cssVarName, val); + } + } +} + +const kInvalidColor = { r: 0, g: 0, b: 0, a: 1 }; + +function _cssColorToRGBA(doc, cssColor) { + if (!cssColor) { + return null; + } + return ( + doc.defaultView.InspectorUtils.colorToRGBA(cssColor, doc) || kInvalidColor + ); +} + +function _rgbaToString(parsedColor) { + if (!parsedColor) { + return null; + } + let { r, g, b, a } = parsedColor; + if (a == 1) { + return `rgb(${r}, ${g}, ${b})`; + } + return `rgba(${r}, ${g}, ${b}, ${a})`; +} + +function _isColorDark(r, g, b) { + return 0.2125 * r + 0.7154 * g + 0.0721 * b <= 127; +} |