/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @constructor
 * @extends {WebInspector.View}
 */
WebInspector.OverridesView = function()
{
    WebInspector.View.call(this);
    this.registerRequiredCSS("overrides.css");
    this.registerRequiredCSS("helpScreen.css");
    this.element.classList.add("overrides-view", "fill", "vbox");

    this._tabbedPane = new WebInspector.TabbedPane();
    this._tabbedPane.shrinkableTabs = false;
    this._tabbedPane.verticalTabLayout = true;

    new WebInspector.OverridesView.DeviceTab().appendAsTab(this._tabbedPane);
    new WebInspector.OverridesView.ViewportTab().appendAsTab(this._tabbedPane);
    new WebInspector.OverridesView.UserAgentTab().appendAsTab(this._tabbedPane);
    new WebInspector.OverridesView.SensorsTab().appendAsTab(this._tabbedPane);

    this._lastSelectedTabSetting = WebInspector.settings.createSetting("lastSelectedEmulateTab", "device");
    this._tabbedPane.selectTab(this._lastSelectedTabSetting.get());
    this._tabbedPane.addEventListener(WebInspector.TabbedPane.EventTypes.TabSelected, this._tabSelected, this);
    this._tabbedPane.show(this.element);

    this._warningFooter = this.element.createChild("div", "overrides-footer");
    this._overridesWarningUpdated();
    WebInspector.overridesSupport.addEventListener(WebInspector.OverridesSupport.Events.OverridesWarningUpdated, this._overridesWarningUpdated, this);
}

WebInspector.OverridesView.prototype = {
    /**
     * @param {!WebInspector.Event} event
     */
    _tabSelected: function(event)
    {
        this._lastSelectedTabSetting.set(this._tabbedPane.selectedTabId);
    },

    _overridesWarningUpdated: function()
    {
        var message = WebInspector.overridesSupport.warningMessage();
        this._warningFooter.enableStyleClass("hidden", !message);
        this._warningFooter.textContent = message;
    },

    __proto__: WebInspector.View.prototype
}

/**
 * @constructor
 * @extends {WebInspector.View}
 * @param {string} id
 * @param {string} name
 * @param {!Array.<!WebInspector.Setting>} settings
 */
WebInspector.OverridesView.Tab = function(id, name, settings)
{
    WebInspector.View.call(this);
    this._id = id;
    this._name = name;
    this._settings = settings;
    for (var i = 0; i < settings.length; ++i)
        settings[i].addChangeListener(this._updateActiveState, this);
}

WebInspector.OverridesView.Tab.prototype = {
    /**
     * @param {!WebInspector.TabbedPane} tabbedPane
     */
    appendAsTab: function(tabbedPane)
    {
        this._tabbedPane = tabbedPane;
        tabbedPane.appendTab(this._id, this._name, this);
        this._updateActiveState();
    },

    _updateActiveState: function()
    {
        var active = false;
        for (var i = 0; !active && i < this._settings.length; ++i)
            active = this._settings[i].get();
        this._tabbedPane.element.enableStyleClass("overrides-activate-" + this._id, active);
        this._tabbedPane.changeTabTitle(this._id, active ? this._name + " \u2713" : this._name);
    },

    /**
     * Creates an input element under the parentElement with the given id and defaultText.
     * It also sets an onblur event listener.
     * @param {!Element} parentElement
     * @param {string} id
     * @param {string} defaultText
     * @param {function(*)} eventListener
     * @param {boolean=} numeric
     * @return {!Element} element
     */
    _createInput: function(parentElement, id, defaultText, eventListener, numeric)
    {
        var element = parentElement.createChild("input");
        element.id = id;
        element.type = "text";
        element.maxLength = 12;
        element.style.width = "80px";
        element.value = defaultText;
        element.align = "right";
        if (numeric)
            element.className = "numeric";
        element.addEventListener("input", eventListener, false);
        element.addEventListener("keydown", keyDownListener, false);
        function keyDownListener(event)
        {
            if (isEnterKey(event))
                eventListener(event);
        }
        return element;
    },

    /**
     * @param {string} title
     * @param {function(boolean)} callback
     */
    _createNonPersistedCheckbox: function(title, callback)
    {
        var labelElement = document.createElement("label");
        var checkboxElement = labelElement.createChild("input");
        checkboxElement.type = "checkbox";
        checkboxElement.checked = false;
        checkboxElement.addEventListener("click", onclick, false);
        labelElement.appendChild(document.createTextNode(title));
        return labelElement;

        function onclick()
        {
            callback(checkboxElement.checked);
        }
    },

    /**
     * @param {string} name
     * @param {!WebInspector.Setting} setting
     * @param {function(boolean)=} callback
     */
    _createSettingCheckbox: function(name, setting, callback)
    {
        var checkbox = WebInspector.SettingsTab.createCheckbox(name, setting.get.bind(setting), listener, true);

        function listener(value)
        {
            if (setting.get() === value)
                return;

            setting.set(value);
            if (callback)
                callback(value);
        }

        setting.addChangeListener(changeListener);

        function changeListener()
        {
            if (checkbox.firstChild.checked !== setting.get())
                checkbox.firstChild.checked = setting.get();
        }
        return checkbox;
    }
}

WebInspector.OverridesView.Tab.prototype.__proto__ = WebInspector.View.prototype;

/**
 * @constructor
 * @extends {WebInspector.OverridesView.Tab}
 */
WebInspector.OverridesView.DeviceTab = function()
{
    WebInspector.OverridesView.Tab.call(this, "device", WebInspector.UIString("Device"), []);
    this.element.classList.add("overrides-device");

    this._emulatedDeviceSetting = WebInspector.settings.createSetting("emulatedDevice", "Google Nexus 4");
    this._emulateDeviceViewportSetting = WebInspector.settings.overrideDeviceMetrics;
    this._emulateDeviceUserAgentSetting = WebInspector.settings.overrideUserAgent;

    this._deviceSelectElement = this.element.createChild("select");

    var devices = WebInspector.OverridesView.DeviceTab._phones.concat(WebInspector.OverridesView.DeviceTab._tablets);
    devices.sort();
    var selectionRestored = false;
    for (var i = 0; i < devices.length; ++i) {
        var device = devices[i];
        var option = new Option(device[0], device[0]);
        option._userAgent = device[1];
        option._metrics = device[2];
        this._deviceSelectElement.add(option);
        if (this._emulatedDeviceSetting.get() === device[0]) {
            this._deviceSelectElement.selectedIndex = i;
            selectionRestored = true;
        }
    }

    if (!selectionRestored)
        this._deviceSelectElement.selectedIndex = devices.length - 1;

    this._deviceSelectElement.addEventListener("change", this._deviceSelected.bind(this), false);
    this._deviceSelectElement.addEventListener("dblclick", this._emulateButtonClicked.bind(this), false);
    this._deviceSelectElement.addEventListener("keypress", this._keyPressed.bind(this), false);
    this._deviceSelectElement.disabled = WebInspector.isInspectingDevice();

    var buttonsBar = this.element.createChild("div");
    var emulateButton = buttonsBar.createChild("button", "settings-tab-text-button");
    emulateButton.textContent = WebInspector.UIString("Emulate");
    emulateButton.addEventListener("click", this._emulateButtonClicked.bind(this), false);
    emulateButton.disabled = WebInspector.isInspectingDevice();
    this._emulateButton = emulateButton;

    var resetButton = buttonsBar.createChild("button", "settings-tab-text-button");
    resetButton.textContent = WebInspector.UIString("Reset");
    resetButton.addEventListener("click", this._resetButtonClicked.bind(this), false);

    this._viewportValueLabel = this.element.createChild("div", "overrides-device-value-label");
    this._viewportValueLabel.textContent = WebInspector.UIString("Viewport:");
    this._viewportValueElement = this._viewportValueLabel.createChild("span", "overrides-device-value");

    this._userAgentLabel = this.element.createChild("div", "overrides-device-value-label");
    this._userAgentLabel.textContent = WebInspector.UIString("User agent:");
    this._userAgentValueElement = this._userAgentLabel.createChild("span", "overrides-device-value");

    this._updateValueLabels();
}

// Third element lists device metrics separated by 'x':
// - screen width,
// - screen height,
// - device scale factor,
// - use text autosizing.
WebInspector.OverridesView.DeviceTab._phones = [
    ["Apple iPhone 3GS",
     "Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5",
     "320x480x1"],
    ["Apple iPhone 4",
     "Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5",
     "640x960x2"],
    ["Apple iPhone 5",
     "Mozilla/5.0 (iPhone; CPU iPhone OS 7_0 like Mac OS X; en-us) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11A465 Safari/9537.53",
     "640x1136x2"],
    ["BlackBerry Z10",
     "Mozilla/5.0 (BB10; Touch) AppleWebKit/537.10+ (KHTML, like Gecko) Version/10.0.9.2372 Mobile Safari/537.10+",
     "768x1280x2"],
    ["BlackBerry Z30",
     "Mozilla/5.0 (BB10; Touch) AppleWebKit/537.10+ (KHTML, like Gecko) Version/10.0.9.2372 Mobile Safari/537.10+",
     "720x1280x2"],
    ["Google Nexus 4",
     "Mozilla/5.0 (Linux; Android 4.2.1; en-us; Nexus 4 Build/JOP40D) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Mobile Safari/535.19",
     "768x1280x2"],
    ["Google Nexus 5",
     "Mozilla/5.0 (Linux; Android 4.2.1; en-us; Nexus 5 Build/JOP40D) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Mobile Safari/535.19",
     "1080x1920x3"],
    ["Google Nexus S",
     "Mozilla/5.0 (Linux; U; Android 2.3.4; en-us; Nexus S Build/GRJ22) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "480x800x1.5"],
    ["HTC Evo, Touch HD, Desire HD, Desire",
     "Mozilla/5.0 (Linux; U; Android 2.2; en-us; Sprint APA9292KT Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "480x800x1.5"],
    ["HTC One X, EVO LTE",
     "Mozilla/5.0 (Linux; Android 4.0.3; HTC One X Build/IML74K) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.133 Mobile Safari/535.19",
     "720x1280x2"],
    ["HTC Sensation, Evo 3D",
     "Mozilla/5.0 (Linux; U; Android 4.0.3; en-us; HTC Sensation Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30",
     "540x960x1.5"],
    ["LG Optimus 2X, Optimus 3D, Optimus Black",
     "Mozilla/5.0 (Linux; U; Android 2.2; en-us; LG-P990/V08c Build/FRG83) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 MMS/LG-Android-MMS-V1.0/1.2",
     "480x800x1.5"],
    ["LG Optimus G",
     "Mozilla/5.0 (Linux; Android 4.0; LG-E975 Build/IMM76L) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Mobile Safari/535.19",
     "768x1280x2"],
    ["LG Optimus LTE, Optimus 4X HD",
     "Mozilla/5.0 (Linux; U; Android 2.3; en-us; LG-P930 Build/GRJ90) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "720x1280x1.7"],
    ["LG Optimus One",
     "Mozilla/5.0 (Linux; U; Android 2.2.1; en-us; LG-MS690 Build/FRG83) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "320x480x1.5"],
    ["Motorola Defy, Droid, Droid X, Milestone",
     "Mozilla/5.0 (Linux; U; Android 2.0; en-us; Milestone Build/ SHOLS_U2_01.03.1) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17",
     "480x854x1.5"],
    ["Motorola Droid 3, Droid 4, Droid Razr, Atrix 4G, Atrix 2",
     "Mozilla/5.0 (Linux; U; Android 2.2; en-us; Droid Build/FRG22D) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "540x960x1"],
    ["Motorola Droid Razr HD",
     "Mozilla/5.0 (Linux; U; Android 2.3; en-us; DROID RAZR 4G Build/6.5.1-73_DHD-11_M1-29) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "720x1280x1"],
    ["Nokia C5, C6, C7, N97, N8, X7",
     "NokiaN97/21.1.107 (SymbianOS/9.4; Series60/5.0 Mozilla/5.0; Profile/MIDP-2.1 Configuration/CLDC-1.1) AppleWebkit/525 (KHTML, like Gecko) BrowserNG/7.1.4",
     "360x640x1"],
    ["Nokia Lumia 7X0, Lumia 8XX, Lumia 900, N800, N810, N900",
     "Mozilla/5.0 (compatible; MSIE 10.0; Windows Phone 8.0; Trident/6.0; IEMobile/10.0; ARM; Touch; NOKIA; Lumia 820)",
     "480x800x1.5"],
    ["Samsung Galaxy Note 3",
     "Mozilla/5.0 (Linux; U; Android 4.3; en-us; SM-N900T Build/JSS15J) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30",
     "1080x1920x2"],
    ["Samsung Galaxy Note II",
     "Mozilla/5.0 (Linux; U; Android 4.1; en-us; GT-N7100 Build/JRO03C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30",
     "720x1280x2"],
    ["Samsung Galaxy Note",
     "Mozilla/5.0 (Linux; U; Android 2.3; en-us; SAMSUNG-SGH-I717 Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "800x1280x2"],
    ["Samsung Galaxy S III, Galaxy Nexus",
     "Mozilla/5.0 (Linux; U; Android 4.0; en-us; GT-I9300 Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30",
     "720x1280x2"],
    ["Samsung Galaxy S, S II, W",
     "Mozilla/5.0 (Linux; U; Android 2.1; en-us; GT-I9000 Build/ECLAIR) AppleWebKit/525.10+ (KHTML, like Gecko) Version/3.0.4 Mobile Safari/523.12.2",
     "480x800x1.5"],
    ["Samsung Galaxy S4",
     "Mozilla/5.0 (Linux; U; Android 2.1; en-us; GT-I9000 Build/ECLAIR) AppleWebKit/525.10+ (KHTML, like Gecko) Version/3.0.4 Mobile Safari/523.12.2",
     "1080x1920x3"],
    ["Sony Xperia S, Ion",
     "Mozilla/5.0 (Linux; U; Android 4.0; en-us; LT28at Build/6.1.C.1.111) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30",
     "720x1280x2"],
    ["Sony Xperia Sola, U",
     "Mozilla/5.0 (Linux; U; Android 2.3; en-us; SonyEricssonST25i Build/6.0.B.1.564) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "480x854x1"],
    ["Sony Xperia Z, Z1",
     "Mozilla/5.0 (Linux; U; Android 4.2; en-us; SonyC6903 Build/14.1.G.1.518) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30",
     "1080x1920x3"],
];

WebInspector.OverridesView.DeviceTab._tablets = [
    ["Amazon Amazon Kindle Fire HD 7\"",
     "Mozilla/5.0 (Linux; U; Android 2.3.4; en-us; Kindle Fire HD Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "1280x800x1.5"],
    ["Amazon Amazon Kindle Fire HD 8.9\"",
     "Mozilla/5.0 (Linux; U; Android 2.3.4; en-us; Kindle Fire HD Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "1920x1200x1.5"],
    ["Amazon Amazon Kindle Fire",
     "Mozilla/5.0 (Linux; U; Android 2.3.4; en-us; Kindle Fire Build/GINGERBREAD) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "1024x600x1"],
    ["Apple iPad 1 / 2 / iPad Mini",
     "Mozilla/5.0 (iPad; CPU OS 4_3_5 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8L1 Safari/6533.18.5",
     "1024x768x1"],
    ["Apple iPad 3 / 4",
     "Mozilla/5.0 (iPad; CPU OS 7_0 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11A465 Safari/9537.53",
     "2048x1536x2"],
    ["BlackBerry PlayBook",
     "Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.1.0; en-US) AppleWebKit/536.2+ (KHTML like Gecko) Version/7.2.1.0 Safari/536.2+",
     "1024x600x1"],
    ["Google Nexus 10",
     "Mozilla/5.0 (Linux; Android 4.3; Nexus 10 Build/JSS15Q) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.72 Safari/537.36",
     "2560x1600x2"],
    ["Google Nexus 7 2",
     "Mozilla/5.0 (Linux; Android 4.3; Nexus 7 Build/JSS15Q) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.72 Safari/537.36",
     "1920x1200x2"],
    ["Google Nexus 7",
     "Mozilla/5.0 (Linux; Android 4.3; Nexus 7 Build/JSS15Q) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.72 Safari/537.36",
     "1280x800x1.325"],
    ["Motorola Xoom, Xyboard",
     "Mozilla/5.0 (Linux; U; Android 3.0; en-us; Xoom Build/HRI39) AppleWebKit/525.10 (KHTML, like Gecko) Version/3.0.4 Mobile Safari/523.12.2",
     "1280x800x1"],
    ["Samsung Galaxy Tab 7.7, 8.9, 10.1",
     "Mozilla/5.0 (Linux; U; Android 2.2; en-us; SCH-I800 Build/FROYO) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "1280x800x1"],
    ["Samsung Galaxy Tab",
     "Mozilla/5.0 (Linux; U; Android 2.2; en-us; SCH-I800 Build/FROYO) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1",
     "1024x600x1"],
];

WebInspector.OverridesView.DeviceTab.prototype = {
    /**
     * @param {!Event} e
     */
    _keyPressed: function(e)
    {
        if (e.keyCode === WebInspector.KeyboardShortcut.Keys.Enter.code)
            this._emulateButtonClicked();
    },

    _emulateButtonClicked: function()
    {
        var option = this._deviceSelectElement.options[this._deviceSelectElement.selectedIndex];
        WebInspector.overridesSupport.emulateDevice(option._metrics, option._userAgent);
    },

    _resetButtonClicked: function()
    {
        WebInspector.overridesSupport.reset();
    },

    _deviceSelected: function()
    {
        var option = this._deviceSelectElement.options[this._deviceSelectElement.selectedIndex];
        this._emulatedDeviceSetting.set(option.value);
        this._updateValueLabels();
    },

    _updateValueLabels: function()
    {
        var option = this._deviceSelectElement.options[this._deviceSelectElement.selectedIndex];
        var metrics;
        if (option._metrics && (metrics = WebInspector.OverridesSupport.DeviceMetrics.parseSetting(option._metrics)))
            this._viewportValueElement.textContent = WebInspector.UIString("%s \u00D7 %s, devicePixelRatio = %s", metrics.width, metrics.height, metrics.deviceScaleFactor);
        else
            this._viewportValueElement.textContent = "";
        this._userAgentValueElement.textContent = option._userAgent || "";
    }
}

WebInspector.OverridesView.DeviceTab.prototype.__proto__ = WebInspector.OverridesView.Tab.prototype;


/**
 * @constructor
 * @extends {WebInspector.OverridesView.Tab}
 */
WebInspector.OverridesView.ViewportTab = function()
{
    WebInspector.OverridesView.Tab.call(this, "viewport", WebInspector.UIString("Screen"), [WebInspector.settings.overrideDeviceMetrics, WebInspector.settings.overrideCSSMedia]);
    this.element.classList.add("overrides-viewport");

    const metricsSetting = WebInspector.settings.deviceMetrics.get();
    var metrics = WebInspector.OverridesSupport.DeviceMetrics.parseSetting(metricsSetting);
    var checkbox = this._createSettingCheckbox(WebInspector.UIString("Emulate screen"), WebInspector.settings.overrideDeviceMetrics, this._onMetricsCheckboxClicked.bind(this));
    checkbox.firstChild.disabled = WebInspector.isInspectingDevice();
    WebInspector.settings.deviceMetrics.addChangeListener(this._updateDeviceMetricsElement, this);

    this.element.appendChild(checkbox);
    this.element.appendChild(this._createDeviceMetricsElement(metrics));
    this.element.appendChild(this._createMediaEmulationElement());

    var footnote = this.element.createChild("p", "help-footnote");
    var footnoteLink = footnote.createChild("a");
    footnoteLink.href = "https://developers.google.com/chrome-developer-tools/docs/mobile-emulation";
    footnoteLink.target = "_blank";
    footnoteLink.createTextChild(WebInspector.UIString("More information about screen emulation"));

    this._onMetricsCheckboxClicked(WebInspector.settings.overrideDeviceMetrics.get());
}

WebInspector.OverridesView.ViewportTab.prototype = {
    /**
     * @param {boolean} enabled
     */
    _onMetricsCheckboxClicked: function(enabled)
    {
        if (enabled && !this._widthOverrideElement.value)
            this._widthOverrideElement.focus();
        this._applyDeviceMetricsUserInput();
    },

    _applyDeviceMetricsUserInput: function()
    {
        this._muteRangeListener = true;
        this._widthRangeInput.value = this._widthOverrideElement.value;
        delete this._muteRangeListener;
        if (this._applyDeviceMetricsTimer)
            clearTimeout(this._applyDeviceMetricsTimer);
        this._applyDeviceMetricsTimer = setTimeout(this._doApplyDeviceMetricsUserInput.bind(this), 50);
    },

    _doApplyDeviceMetricsUserInput: function()
    {
        delete this._applyDeviceMetricsTimer;
        this._setDeviceMetricsOverride(WebInspector.OverridesSupport.DeviceMetrics.parseUserInput(this._widthOverrideElement.value.trim(), this._heightOverrideElement.value.trim(), this._deviceScaleFactorOverrideElement.value.trim(), this._textAutosizingOverrideCheckbox.checked), true);
    },

    /**
     * @param {?WebInspector.OverridesSupport.DeviceMetrics} metrics
     * @param {boolean} userInputModified
     */
    _setDeviceMetricsOverride: function(metrics, userInputModified)
    {
        function setValid(condition, element)
        {
            if (condition)
                element.classList.remove("error-input");
            else
                element.classList.add("error-input");
        }

        setValid(metrics && metrics.isWidthValid(), this._widthOverrideElement);
        setValid(metrics && metrics.isHeightValid(), this._heightOverrideElement);
        setValid(metrics && metrics.isDeviceScaleFactorValid(), this._deviceScaleFactorOverrideElement);

        if (!metrics)
            return;

        if (!userInputModified) {
            this._widthOverrideElement.value = metrics.widthToInput();
            this._heightOverrideElement.value = metrics.heightToInput();
            this._deviceScaleFactorOverrideElement.value = metrics.deviceScaleFactorToInput();
            this._textAutosizingOverrideCheckbox.checked = metrics.textAutosizing;
        }

        if (metrics.isValid()) {
            var value = metrics.toSetting();
            if (value !== WebInspector.settings.deviceMetrics.get())
                WebInspector.settings.deviceMetrics.set(value);
        }
    },

    /**
     * @param {!WebInspector.OverridesSupport.DeviceMetrics} metrics
     */
    _createDeviceMetricsElement: function(metrics)
    {
        var fieldsetElement = WebInspector.SettingsTab.createSettingFieldset(WebInspector.settings.overrideDeviceMetrics);
        if (WebInspector.isInspectingDevice())
            fieldsetElement.disabled = true;
        fieldsetElement.id = "metrics-override-section";

        /**
         * @this {WebInspector.OverridesView.ViewportTab}
         */
        function swapDimensionsClicked()
        {
            var widthValue = this._widthOverrideElement.value;
            this._widthOverrideElement.value = this._heightOverrideElement.value;
            this._heightOverrideElement.value = widthValue;
            this._applyDeviceMetricsUserInput();
        }

        var tableElement = fieldsetElement.createChild("table", "nowrap");

        var rowElement = tableElement.createChild("tr");
        var cellElement = rowElement.createChild("td");
        cellElement.appendChild(document.createTextNode(WebInspector.UIString("Resolution:")));
        cellElement = rowElement.createChild("td");
        this._widthOverrideElement = this._createInput(cellElement, "metrics-override-width", String(metrics.width || screen.width), this._applyDeviceMetricsUserInput.bind(this), true);
        this._swapDimensionsElement = cellElement.createChild("button", "overrides-swap");
        this._swapDimensionsElement.appendChild(document.createTextNode(" \u21C4 ")); // RIGHTWARDS ARROW OVER LEFTWARDS ARROW.
        this._swapDimensionsElement.title = WebInspector.UIString("Swap dimensions");
        this._swapDimensionsElement.addEventListener("click", swapDimensionsClicked.bind(this), false);
        this._swapDimensionsElement.tabIndex = -1;
        this._heightOverrideElement = this._createInput(cellElement, "metrics-override-height", String(metrics.height || screen.height), this._applyDeviceMetricsUserInput.bind(this), true);

        rowElement = tableElement.createChild("tr");
        cellElement = rowElement.createChild("td");
        cellElement.colSpan = 4;
        this._widthRangeInput = cellElement.createChild("input");
        this._widthRangeInput.type = "range";
        this._widthRangeInput.min = 100;
        this._widthRangeInput.max = 2000;
        this._widthRangeInput.addEventListener("change", this._rangeValueChanged.bind(this), false);
        this._widthRangeInput.value = this._widthOverrideElement.value;

        rowElement = tableElement.createChild("tr");
        rowElement.title = WebInspector.UIString("Ratio between a device's physical pixels and device-independent pixels.");
        cellElement = rowElement.createChild("td");
        cellElement.appendChild(document.createTextNode(WebInspector.UIString("Device pixel ratio:")));
        cellElement = rowElement.createChild("td");
        this._deviceScaleFactorOverrideElement = this._createInput(cellElement, "metrics-override-device-scale", String(metrics.deviceScaleFactor || 1), this._applyDeviceMetricsUserInput.bind(this), true);

        var textAutosizingOverrideElement = this._createNonPersistedCheckbox(WebInspector.UIString("Enable text autosizing "), this._applyDeviceMetricsUserInput.bind(this));
        textAutosizingOverrideElement.title = WebInspector.UIString("Text autosizing is the feature that boosts font sizes on mobile devices.");
        this._textAutosizingOverrideCheckbox = textAutosizingOverrideElement.firstChild;
        this._textAutosizingOverrideCheckbox.checked = metrics.textAutosizing;
        fieldsetElement.appendChild(textAutosizingOverrideElement);

        var checkbox = this._createSettingCheckbox(WebInspector.UIString("Emulate viewport"), WebInspector.settings.emulateViewport);
        fieldsetElement.appendChild(checkbox);

        checkbox = this._createSettingCheckbox(WebInspector.UIString("Shrink to fit"), WebInspector.settings.deviceFitWindow);
        fieldsetElement.appendChild(checkbox);

        return fieldsetElement;
    },

    _updateDeviceMetricsElement: function()
    {
        const metricsSetting = WebInspector.settings.deviceMetrics.get();
        var metrics = WebInspector.OverridesSupport.DeviceMetrics.parseSetting(metricsSetting);

        if (this._widthOverrideElement.value !== metrics.width)
            this._widthOverrideElement.value  = metrics.width || screen.width;
        this._muteRangeListener = true;
        if (this._widthRangeInput.value != metrics.width)
            this._widthRangeInput.value = metrics.width || screen.width;
        delete this._muteRangeListener;
        if (this._heightOverrideElement.value !== metrics.height)
            this._heightOverrideElement.value = metrics.height || screen.height;
        if (this._deviceScaleFactorOverrideElement.value !== metrics.deviceScaleFactor)
            this._deviceScaleFactorOverrideElement.value = metrics.deviceScaleFactor || 1;
        if (this._textAutosizingOverrideCheckbox.checked !== metrics.textAutosizing)
            this._textAutosizingOverrideCheckbox.checked = metrics.textAutosizing || false;
    },

    _createMediaEmulationElement: function()
    {
        var checkbox = WebInspector.SettingsTab.createSettingCheckbox(WebInspector.UIString("CSS media"), WebInspector.settings.overrideCSSMedia, true);
        var fieldsetElement = WebInspector.SettingsTab.createSettingFieldset(WebInspector.settings.overrideCSSMedia);
        if (WebInspector.isInspectingDevice())
            fieldsetElement.disabled = true;
        checkbox.appendChild(fieldsetElement);

        var mediaSelectElement = fieldsetElement.createChild("select");
        var mediaTypes = WebInspector.CSSStyleModel.MediaTypes;
        var defaultMedia = WebInspector.settings.emulatedCSSMedia.get();
        for (var i = 0; i < mediaTypes.length; ++i) {
            var mediaType = mediaTypes[i];
            if (mediaType === "all") {
                // "all" is not a device-specific media type.
                continue;
            }
            var option = document.createElement("option");
            option.text = mediaType;
            option.value = mediaType;
            mediaSelectElement.add(option);
            if (mediaType === defaultMedia)
                mediaSelectElement.selectedIndex = mediaSelectElement.options.length - 1;
        }

        mediaSelectElement.addEventListener("change", this._emulateMediaChanged.bind(this, mediaSelectElement), false);
        return checkbox;
    },

    _emulateMediaChanged: function(select)
    {
        var media = select.options[select.selectedIndex].value;
        WebInspector.settings.emulatedCSSMedia.set(media);
    },

    _rangeValueChanged: function()
    {
        if (this._muteRangeListener)
            return;
        this._widthOverrideElement.value = this._widthRangeInput.value;
        this._applyDeviceMetricsUserInput();
    }
}

WebInspector.OverridesView.ViewportTab.prototype.__proto__ = WebInspector.OverridesView.Tab.prototype;


/**
 * @constructor
 * @extends {WebInspector.OverridesView.Tab}
 */
WebInspector.OverridesView.UserAgentTab = function()
{
    WebInspector.OverridesView.Tab.call(this, "user-agent", WebInspector.UIString("User Agent"), [WebInspector.settings.overrideUserAgent]);
    this.element.classList.add("overrides-user-agent");
    var checkbox = this._createSettingCheckbox(WebInspector.UIString("Spoof user agent"), WebInspector.settings.overrideUserAgent);
    checkbox.firstChild.disabled = WebInspector.isInspectingDevice();
    this.element.appendChild(checkbox);
    this.element.appendChild(this._createUserAgentSelectRowElement());
}

WebInspector.OverridesView.UserAgentTab._userAgents = [
    ["Internet Explorer 10", "Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)"],
    ["Internet Explorer 9", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)"],
    ["Internet Explorer 8", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0)"],
    ["Internet Explorer 7", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)"],

    ["Firefox 7 \u2014 Windows", "Mozilla/5.0 (Windows NT 6.1; Intel Mac OS X 10.6; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"],
    ["Firefox 7 \u2014 Mac", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:7.0.1) Gecko/20100101 Firefox/7.0.1"],
    ["Firefox 4 \u2014 Windows", "Mozilla/5.0 (Windows NT 6.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1"],
    ["Firefox 4 \u2014 Mac", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0.1) Gecko/20100101 Firefox/4.0.1"],
    ["Firefox 14 \u2014 Android Mobile", "Mozilla/5.0 (Android; Mobile; rv:14.0) Gecko/14.0 Firefox/14.0"],
    ["Firefox 14 \u2014 Android Tablet", "Mozilla/5.0 (Android; Tablet; rv:14.0) Gecko/14.0 Firefox/14.0"],

    ["Chrome \u2014 Android Mobile", "Mozilla/5.0 (Linux; Android 4.0.4; Galaxy Nexus Build/IMM76B) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.133 Mobile Safari/535.19"],
    ["Chrome \u2014 Android Tablet", "Mozilla/5.0 (Linux; Android 4.1.2; Nexus 7 Build/JZ054K) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Safari/535.19"],

    ["iPhone \u2014 iOS 7", "Mozilla/5.0 (iPhone; CPU iPhone OS 7_0_2 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11A4449d Safari/9537.53"],
    ["iPhone \u2014 iOS 6", "Mozilla/5.0 (iPhone; CPU iPhone OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5376e Safari/8536.25"],
    ["iPad \u2014 iOS 7", "Mozilla/5.0 (iPad; CPU OS 7_0_2 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11A501 Safari/9537.53"],
    ["iPad \u2014 iOS 6", "Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A5376e Safari/8536.25"],

    ["Android 2.3 \u2014 Nexus S", "Mozilla/5.0 (Linux; U; Android 2.3.6; en-us; Nexus S Build/GRK39F) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"],
    ["Android 4.0.2 \u2014 Galaxy Nexus", "Mozilla/5.0 (Linux; U; Android 4.0.2; en-us; Galaxy Nexus Build/ICL53F) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30"],

    ["BlackBerry \u2014 PlayBook 2.1", "Mozilla/5.0 (PlayBook; U; RIM Tablet OS 2.1.0; en-US) AppleWebKit/536.2+ (KHTML, like Gecko) Version/7.2.1.0 Safari/536.2+"],
    ["BlackBerry \u2014 9900", "Mozilla/5.0 (BlackBerry; U; BlackBerry 9900; en-US) AppleWebKit/534.11+ (KHTML, like Gecko) Version/7.0.0.187 Mobile Safari/534.11+"],
    ["BlackBerry \u2014 BB10", "Mozilla/5.0 (BB10; Touch) AppleWebKit/537.1+ (KHTML, like Gecko) Version/10.0.0.1337 Mobile Safari/537.1+"],

    ["MeeGo \u2014 Nokia N9", "Mozilla/5.0 (MeeGo; NokiaN9) AppleWebKit/534.13 (KHTML, like Gecko) NokiaBrowser/8.5.0 Mobile Safari/534.13"],
];

WebInspector.OverridesView.UserAgentTab.prototype = {
    /**
     * @return {!Element}
     */
    _createUserAgentSelectRowElement: function()
    {
        var userAgent = WebInspector.settings.userAgent.get();
        var userAgents = WebInspector.OverridesView.UserAgentTab._userAgents.concat([[WebInspector.UIString("Other"), "Other"]]);

        var fieldsetElement = WebInspector.SettingsTab.createSettingFieldset(WebInspector.settings.overrideUserAgent);
        if (WebInspector.isInspectingDevice())
            fieldsetElement.disabled = true;

        this._selectElement = fieldsetElement.createChild("select");
        fieldsetElement.createChild("br");
        this._otherUserAgentElement = fieldsetElement.createChild("input");
        this._otherUserAgentElement.type = "text";
        this._otherUserAgentElement.value = userAgent;
        this._otherUserAgentElement.title = userAgent;

        var selectionRestored = false;
        for (var i = 0; i < userAgents.length; ++i) {
            var agent = userAgents[i];
            var option = new Option(agent[0], agent[1]);
            option._metrics = agent[2] ? agent[2] : "";
            this._selectElement.add(option);
            if (userAgent === agent[1]) {
                this._selectElement.selectedIndex = i;
                selectionRestored = true;
            }
        }

        if (!selectionRestored) {
            if (!userAgent)
                this._selectElement.selectedIndex = 0;
            else
                this._selectElement.selectedIndex = userAgents.length - 1;
        }

        this._selectElement.addEventListener("change", this._userAgentChanged.bind(this, true), false);
        WebInspector.settings.userAgent.addChangeListener(this._userAgentSettingChanged, this);

        fieldsetElement.addEventListener("dblclick", textDoubleClicked.bind(this), false);
        this._otherUserAgentElement.addEventListener("blur", textChanged.bind(this), false);

        /**
         * @this {WebInspector.OverridesView.UserAgentTab}
         */
        function textDoubleClicked()
        {
            this._selectElement.selectedIndex = userAgents.length - 1;
            this._userAgentChanged();
        }

        /**
         * @this {WebInspector.OverridesView.UserAgentTab}
         */
        function textChanged()
        {
            if (WebInspector.settings.userAgent.get() !== this._otherUserAgentElement.value)
                WebInspector.settings.userAgent.set(this._otherUserAgentElement.value);
        }

        return fieldsetElement;
    },

    /**
     * @param {boolean=} isUserGesture
     */
    _userAgentChanged: function(isUserGesture)
    {
        var value = this._selectElement.options[this._selectElement.selectedIndex].value;
        if (value !== "Other") {
            WebInspector.settings.userAgent.set(value);
            this._otherUserAgentElement.value = value;
            this._otherUserAgentElement.title = value;
            this._otherUserAgentElement.disabled = true;
        } else {
            this._otherUserAgentElement.disabled = false;
            this._otherUserAgentElement.focus();
        }
    },

    _userAgentSettingChanged: function()
    {
        var value = WebInspector.settings.userAgent.get();
        var options = this._selectElement.options;
        var foundMatch = false;
        for (var i = 0; i < options.length; ++i) {
            if (options[i].value === value) {
                if (this._selectElement.selectedIndex !== i)
                    this._selectElement.selectedIndex = i;
                foundMatch = true;
                break;
            }
        }

        this._otherUserAgentElement.disabled = foundMatch;
        if (!foundMatch)
            this._selectElement.selectedIndex = options.length - 1;

        if (this._otherUserAgentElement.value !== value) {
            this._otherUserAgentElement.value = value;
            this._otherUserAgentElement.title = value;
        }
    }
}

WebInspector.OverridesView.UserAgentTab.prototype.__proto__ = WebInspector.OverridesView.Tab.prototype;


/**
 * @constructor
 * @extends {WebInspector.OverridesView.Tab}
 */
WebInspector.OverridesView.SensorsTab = function()
{
    WebInspector.OverridesView.Tab.call(this, "sensors", WebInspector.UIString("Sensors"), [WebInspector.settings.emulateTouchEvents, WebInspector.settings.overrideGeolocation, WebInspector.settings.overrideDeviceOrientation]);
    this.element.classList.add("overrides-sensors");
    this.registerRequiredCSS("accelerometer.css");
    if (!WebInspector.isInspectingDevice())
        this.element.appendChild(this._createSettingCheckbox(WebInspector.UIString("Emulate touch screen"), WebInspector.settings.emulateTouchEvents));
    this._appendGeolocationOverrideControl();
    if (!WebInspector.isInspectingDevice())
        this._apendDeviceOrientationOverrideControl();
}

WebInspector.OverridesView.SensorsTab.prototype = {
    _appendGeolocationOverrideControl: function()
    {
        const geolocationSetting = WebInspector.settings.geolocationOverride.get();
        var geolocation = WebInspector.OverridesSupport.GeolocationPosition.parseSetting(geolocationSetting);
        this.element.appendChild(this._createSettingCheckbox(WebInspector.UIString("Emulate geolocation coordinates"), WebInspector.settings.overrideGeolocation, this._geolocationOverrideCheckboxClicked.bind(this)));
        this.element.appendChild(this._createGeolocationOverrideElement(geolocation));
        this._geolocationOverrideCheckboxClicked(WebInspector.settings.overrideGeolocation.get());
    },

    /**
     * @param {boolean} enabled
     */
    _geolocationOverrideCheckboxClicked: function(enabled)
    {
        if (enabled && !this._latitudeElement.value)
            this._latitudeElement.focus();
    },

    _applyGeolocationUserInput: function()
    {
        this._setGeolocationPosition(WebInspector.OverridesSupport.GeolocationPosition.parseUserInput(this._latitudeElement.value.trim(), this._longitudeElement.value.trim(), this._geolocationErrorElement.checked), true);
    },

    /**
     * @param {?WebInspector.OverridesSupport.GeolocationPosition} geolocation
     * @param {boolean} userInputModified
     */
    _setGeolocationPosition: function(geolocation, userInputModified)
    {
        if (!geolocation)
            return;

        if (!userInputModified) {
            this._latitudeElement.value = geolocation.latitude;
            this._longitudeElement.value = geolocation.longitude;
        }

        var value = geolocation.toSetting();
        WebInspector.settings.geolocationOverride.set(value);
    },

    /**
     * @param {!WebInspector.OverridesSupport.GeolocationPosition} geolocation
     * @return {!Element}
     */
    _createGeolocationOverrideElement: function(geolocation)
    {
        var fieldsetElement = WebInspector.SettingsTab.createSettingFieldset(WebInspector.settings.overrideGeolocation);
        fieldsetElement.id = "geolocation-override-section";

        var tableElement = fieldsetElement.createChild("table");
        var rowElement = tableElement.createChild("tr");
        var cellElement = rowElement.createChild("td");
        cellElement = rowElement.createChild("td");
        cellElement.appendChild(document.createTextNode(WebInspector.UIString("Lat = ")));
        this._latitudeElement = this._createInput(cellElement, "geolocation-override-latitude", String(geolocation.latitude), this._applyGeolocationUserInput.bind(this), true);
        cellElement.appendChild(document.createTextNode(" , "));
        cellElement.appendChild(document.createTextNode(WebInspector.UIString("Lon = ")));
        this._longitudeElement = this._createInput(cellElement, "geolocation-override-longitude", String(geolocation.longitude), this._applyGeolocationUserInput.bind(this), true);
        rowElement = tableElement.createChild("tr");
        cellElement = rowElement.createChild("td");
        cellElement.colSpan = 2;
        var geolocationErrorLabelElement = document.createElement("label");
        var geolocationErrorCheckboxElement = geolocationErrorLabelElement.createChild("input");
        geolocationErrorCheckboxElement.id = "geolocation-error";
        geolocationErrorCheckboxElement.type = "checkbox";
        geolocationErrorCheckboxElement.checked = !geolocation || geolocation.error;
        geolocationErrorCheckboxElement.addEventListener("click", this._applyGeolocationUserInput.bind(this), false);
        geolocationErrorLabelElement.appendChild(document.createTextNode(WebInspector.UIString("Emulate position unavailable")));
        this._geolocationErrorElement = geolocationErrorCheckboxElement;
        cellElement.appendChild(geolocationErrorLabelElement);

        return fieldsetElement;
    },

    _apendDeviceOrientationOverrideControl: function()
    {
        const deviceOrientationSetting = WebInspector.settings.deviceOrientationOverride.get();
        var deviceOrientation = WebInspector.OverridesSupport.DeviceOrientation.parseSetting(deviceOrientationSetting);
        this.element.appendChild(this._createSettingCheckbox(WebInspector.UIString("Accelerometer"), WebInspector.settings.overrideDeviceOrientation, this._deviceOrientationOverrideCheckboxClicked.bind(this)));
        this.element.appendChild(this._createDeviceOrientationOverrideElement(deviceOrientation));
        this._deviceOrientationOverrideCheckboxClicked(WebInspector.settings.overrideDeviceOrientation.get());
    },

    /**
     * @param {boolean} enabled
     */
    _deviceOrientationOverrideCheckboxClicked: function(enabled)
    {
        if (enabled && !this._alphaElement.value)
            this._alphaElement.focus();
    },

    _applyDeviceOrientationUserInput: function()
    {
        this._setDeviceOrientation(WebInspector.OverridesSupport.DeviceOrientation.parseUserInput(this._alphaElement.value.trim(), this._betaElement.value.trim(), this._gammaElement.value.trim()), WebInspector.OverridesView.SensorsTab.DeviceOrientationModificationSource.UserInput);
    },

    _resetDeviceOrientation: function()
    {
        this._setDeviceOrientation(new WebInspector.OverridesSupport.DeviceOrientation(0, 0, 0), WebInspector.OverridesView.SensorsTab.DeviceOrientationModificationSource.ResetButton);
    },

    /**
     * @param {?WebInspector.OverridesSupport.DeviceOrientation} deviceOrientation
     * @param {!WebInspector.OverridesView.SensorsTab.DeviceOrientationModificationSource} modificationSource
     */
    _setDeviceOrientation: function(deviceOrientation, modificationSource)
    {
        if (!deviceOrientation)
            return;

        if (modificationSource != WebInspector.OverridesView.SensorsTab.DeviceOrientationModificationSource.UserInput) {
            this._alphaElement.value = deviceOrientation.alpha;
            this._betaElement.value = deviceOrientation.beta;
            this._gammaElement.value = deviceOrientation.gamma;
        }

        if (modificationSource != WebInspector.OverridesView.SensorsTab.DeviceOrientationModificationSource.UserDrag)
            this._setBoxOrientation(deviceOrientation);

        var value = deviceOrientation.toSetting();
        WebInspector.settings.deviceOrientationOverride.set(value);
    },

    /**
     * @param {!Element} parentElement
     * @param {string} id
     * @param {string} label
     * @param {string} defaultText
     * @return {!Element}
     */
    _createAxisInput: function(parentElement, id, label, defaultText)
    {
        var div = parentElement.createChild("div", "accelerometer-axis-input-container");
        div.appendChild(document.createTextNode(label));
        return this._createInput(div, id, defaultText, this._applyDeviceOrientationUserInput.bind(this), true);
    },

    /**
     * @param {!WebInspector.OverridesSupport.DeviceOrientation} deviceOrientation
     */
    _createDeviceOrientationOverrideElement: function(deviceOrientation)
    {
        var fieldsetElement = WebInspector.SettingsTab.createSettingFieldset(WebInspector.settings.overrideDeviceOrientation);
        fieldsetElement.id = "device-orientation-override-section";
        var tableElement = fieldsetElement.createChild("table");
        var rowElement = tableElement.createChild("tr");
        var cellElement = rowElement.createChild("td", "accelerometer-inputs-cell");

        this._alphaElement = this._createAxisInput(cellElement, "device-orientation-override-alpha", "\u03B1: ", String(deviceOrientation.alpha));
        this._betaElement = this._createAxisInput(cellElement, "device-orientation-override-beta", "\u03B2: ", String(deviceOrientation.beta));
        this._gammaElement = this._createAxisInput(cellElement, "device-orientation-override-gamma", "\u03B3: ", String(deviceOrientation.gamma));

        var resetButton = cellElement.createChild("button", "settings-tab-text-button accelerometer-reset-button");
        resetButton.textContent = WebInspector.UIString("Reset");
        resetButton.addEventListener("click", this._resetDeviceOrientation.bind(this), false);

        this._stageElement = rowElement.createChild("td","accelerometer-stage");
        this._boxElement = this._stageElement.createChild("section", "accelerometer-box");

        this._boxElement.createChild("section", "front");
        this._boxElement.createChild("section", "top");
        this._boxElement.createChild("section", "back");
        this._boxElement.createChild("section", "left");
        this._boxElement.createChild("section", "right");
        this._boxElement.createChild("section", "bottom");

        WebInspector.installDragHandle(this._stageElement, this._onBoxDragStart.bind(this), this._onBoxDrag.bind(this), this._onBoxDragEnd.bind(this), "move");
        this._setBoxOrientation(deviceOrientation);
        return fieldsetElement;
    },

    /**
     * @param {!WebInspector.OverridesSupport.DeviceOrientation} deviceOrientation
     */
    _setBoxOrientation: function(deviceOrientation)
    {
        var matrix = new WebKitCSSMatrix();
        this._boxMatrix = matrix.rotate(-deviceOrientation.beta, deviceOrientation.gamma, -deviceOrientation.alpha);
        this._boxElement.style.webkitTransform = this._boxMatrix.toString();
    },

    /**
     * @param {!MouseEvent} event
     * @return {boolean}
     */
    _onBoxDrag: function(event)
    {
        var mouseMoveVector = this._calculateRadiusVector(event.x, event.y);
        if (!mouseMoveVector)
            return true;

        event.consume(true);
        var axis = WebInspector.Geometry.crossProduct(this._mouseDownVector, mouseMoveVector);
        axis.normalize();
        var angle = WebInspector.Geometry.calculateAngle(this._mouseDownVector, mouseMoveVector);
        var matrix = new WebKitCSSMatrix();
        var rotationMatrix = matrix.rotateAxisAngle(axis.x, axis.y, axis.z, angle);
        this._currentMatrix = rotationMatrix.multiply(this._boxMatrix)
        this._boxElement.style.webkitTransform = this._currentMatrix;
        var eulerAngles = WebInspector.Geometry.EulerAngles.fromRotationMatrix(this._currentMatrix);
        var newOrientation = new WebInspector.OverridesSupport.DeviceOrientation(-eulerAngles.alpha, -eulerAngles.beta, eulerAngles.gamma);
        this._setDeviceOrientation(newOrientation, WebInspector.OverridesView.SensorsTab.DeviceOrientationModificationSource.UserDrag);
        return false;
    },

    /**
     * @param {!MouseEvent} event
     * @return {boolean}
     */
    _onBoxDragStart: function(event)
    {
        if (!WebInspector.settings.overrideDeviceOrientation.get())
            return false;

        this._mouseDownVector = this._calculateRadiusVector(event.x, event.y);

        if (!this._mouseDownVector)
            return false;

        event.consume(true);
        return true;
    },

    _onBoxDragEnd: function()
    {
        this._boxMatrix = this._currentMatrix;
    },

    /**
     * @param {number} x
     * @param {number} y
     * @return {?WebInspector.Geometry.Vector}
     */
    _calculateRadiusVector: function(x, y)
    {
        var rect = this._stageElement.getBoundingClientRect();
        var radius = Math.max(rect.width, rect.height) / 2;
        var sphereX = (x - rect.left - rect.width / 2) / radius;
        var sphereY = (y - rect.top - rect.height / 2) / radius;
        var sqrSum = sphereX * sphereX + sphereY * sphereY;
        if (sqrSum > 0.5)
            return new WebInspector.Geometry.Vector(sphereX, sphereY, 0.5 / Math.sqrt(sqrSum));

        return new WebInspector.Geometry.Vector(sphereX, sphereY, Math.sqrt(1 - sqrSum));
    },

    __proto__ : WebInspector.OverridesView.Tab.prototype
}

/** @enum {string} */
WebInspector.OverridesView.SensorsTab.DeviceOrientationModificationSource = {
    UserInput: "userInput",
    UserDrag: "userDrag",
    ResetButton: "resetButton"
}