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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/. */
this.EXPORTED_SYMBOLS = ["LightweightThemeConsumer"];
const {utils: Cu} = Components;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "LightweightThemeImageOptimizer",
"resource://gre/modules/addons/LightweightThemeImageOptimizer.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils",
"resource://gre/modules/PrivateBrowsingUtils.jsm");
this.LightweightThemeConsumer =
function LightweightThemeConsumer(aDocument) {
this._doc = aDocument;
this._win = aDocument.defaultView;
this._footerId = aDocument.documentElement.getAttribute("lightweightthemesfooter");
/* XXX: If we want to disable LWTs for PB mode, this would be needed.
* Perhaps make this pref-controlled in the future if people want it?
if (PrivateBrowsingUtils.isWindowPrivate(this._win) &&
!PrivateBrowsingUtils.permanentPrivateBrowsing) {
return;
} */
let screen = this._win.screen;
this._lastScreenWidth = screen.width;
this._lastScreenHeight = screen.height;
Services.obs.addObserver(this, "lightweight-theme-styling-update", false);
var temp = {};
Cu.import("resource://gre/modules/LightweightThemeManager.jsm", temp);
this._update(temp.LightweightThemeManager.currentThemeForDisplay);
this._win.addEventListener("resize", this);
}
LightweightThemeConsumer.prototype = {
_lastData: null,
_lastScreenWidth: null,
_lastScreenHeight: null,
// Whether the active lightweight theme should be shown on the window.
_enabled: true,
// Whether a lightweight theme is enabled.
_active: false,
enable: function() {
this._enabled = true;
this._update(this._lastData);
},
disable: function() {
// Dance to keep the data, but reset the applied styles:
let lastData = this._lastData
this._update(null);
this._enabled = false;
this._lastData = lastData;
},
getData: function() {
return this._enabled ? Cu.cloneInto(this._lastData, this._win) : null;
},
observe: function (aSubject, aTopic, aData) {
if (aTopic != "lightweight-theme-styling-update")
return;
this._update(JSON.parse(aData));
},
handleEvent: function (aEvent) {
let {width, height} = this._win.screen;
if (this._lastScreenWidth != width || this._lastScreenHeight != height) {
this._lastScreenWidth = width;
this._lastScreenHeight = height;
if (!this._active)
return;
this._update(this._lastData);
Services.obs.notifyObservers(this._win, "lightweight-theme-optimized",
JSON.stringify(this._lastData));
}
},
destroy: function () {
/* XXX: If we want to disable LWTs for PB mode, this would be needed.
if (!PrivateBrowsingUtils.isWindowPrivate(this._win) ||
PrivateBrowsingUtils.permanentPrivateBrowsing) {
Services.obs.removeObserver(this, "lightweight-theme-styling-update");
this._win.removeEventListener("resize", this);
} */
Services.obs.removeObserver(this, "lightweight-theme-styling-update");
this._win.removeEventListener("resize", this);
this._win = this._doc = null;
},
_update: function (aData) {
if (!aData) {
aData = { headerURL: "", footerURL: "", textcolor: "", accentcolor: "" };
this._lastData = aData;
} else {
this._lastData = aData;
aData = LightweightThemeImageOptimizer.optimize(aData, this._win.screen);
}
if (!this._enabled)
return;
let root = this._doc.documentElement;
let active = !!aData.headerURL;
let stateChanging = (active != this._active);
// We need to clear these either way: either because the theme is being removed,
// or because we are applying a new theme and the data might be bogus CSS,
// so if we don't reset first, it'll keep the old value.
root.style.removeProperty("color");
root.style.removeProperty("background-color");
if (active) {
root.style.color = aData.textcolor || "black";
root.style.backgroundColor = aData.accentcolor || "white";
let [r, g, b] = _parseRGB(this._doc.defaultView.getComputedStyle(root, "").color);
let luminance = 0.2125 * r + 0.7154 * g + 0.0721 * b;
root.setAttribute("lwthemetextcolor", luminance <= 110 ? "dark" : "bright");
root.setAttribute("lwtheme", "true");
} else {
root.removeAttribute("lwthemetextcolor");
root.removeAttribute("lwtheme");
}
this._active = active;
_setImage(root, active, aData.headerURL);
if (this._footerId) {
let footer = this._doc.getElementById(this._footerId);
footer.style.backgroundColor = active ? aData.accentcolor || "white" : "";
_setImage(footer, active, aData.footerURL);
if (active && aData.footerURL)
footer.setAttribute("lwthemefooter", "true");
else
footer.removeAttribute("lwthemefooter");
}
Services.obs.notifyObservers(this._win, "lightweight-theme-window-updated",
JSON.stringify(aData));
}
}
function _setImage(aElement, aActive, aURL) {
aElement.style.backgroundImage =
(aActive && aURL) ? 'url("' + aURL.replace(/"/g, '\\"') + '")' : "";
}
function _parseRGB(aColorString) {
var rgb = aColorString.match(/^rgba?\((\d+), (\d+), (\d+)/);
rgb.shift();
return rgb.map(x => parseInt(x));
}
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