Use a specialized new tab page in TOUCH_UI builds

chrome/browser/resources/touch_ntp/standalone/standalone_hack.js

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ *  @fileoverview NTP Standalone hack
+ *  This file contains the code necessary to make the Touch NTP work
+ *  as a stand-alone application (as opposed to being embedded into chrome).
+ *  This is useful for rapid development and testing, but does not actually form
+ *  part of the product.
+ *
+ *  Note that, while the product portion of the touch NTP is designed to work
+ *  just in the latest version of Chrome, this hack attempts to add some support
+ *  for working in older browsers to enable testing and demonstration on
+ *  existing tablet platforms.  In particular, this code has been tested to work
+ *  on Mobile Safari in iOS 4.2.  The goal is that the need to support any other
+ *  browser should not leak out of this file - and so we will hack global JS
+ *  objects as necessary here to present the illusion of running on the latest
+ *  version of Chrome.
+ */
+
+// Note that this file never gets concatenated and embeded into Chrome, so we
+// can enable strict mode for the whole file just like normal.
+'use strict';
+
+/**
+ * For non-Chrome browsers, create a dummy chrome object
+ */
+if (!window.chrome) {
+  var chrome = {};
+}
+
+/**
+ *  A replacement chrome.send method that supplies static data for the
+ *  key APIs used by the NTP.
+ *
+ *  Note that the real chrome object also supplies data for most-viewed and
+ *  recently-closed pages, but the tangent NTP doesn't use that data so we
+ *  don't bother simulating it here.
+ *
+ *  We create this object by applying an anonymous function so that we can have
+ *  local variables (avoid polluting the global object)
+ */
+chrome.send = (function() {
+
+    var apps = [{
+        app_launch_index: 2,
+        description: 'The prickly puzzle game where popping balloons has ' +
+            'never been so much fun!',
+        icon_big: 'standalone/poppit-icon.png',
+        icon_small: 'standalone/poppit-favicon.png',
+        id: 'mcbkbpnkkkipelfledbfocopglifcfmi',
+        launch_container: 2,
+        launch_type: 1,
+        launch_url: 'http://poppit.pogo.com/hd/PoppitHD.html',
+        name: 'Poppit',
+        options_url: ''
+    },
+    {
+        app_launch_index: 1,
+        description: 'Fast, searchable email with less spam.',
+        icon_big: 'standalone/gmail-icon.png',
+        icon_small: 'standalone/gmail-favicon.png',
+        id: 'pjkljhegncpnkpknbcohdijeoejaedia',
+        launch_container: 2,
+        launch_type: 1,
+        launch_url: 'https://mail.google.com/',
+        name: 'Gmail',
+        options_url: 'https://mail.google.com/mail/#settings'
+    },
+    {
+        app_launch_index: 3,
+        description: 'Read over 3 million Google eBooks on the web.',
+        icon_big: 'standalone/googlebooks-icon.png',
+        icon_small: 'standalone/googlebooks-favicon.png',
+        id: 'mmimngoggfoobjdlefbcabngfnmieonb',
+        launch_container: 2,
+        launch_type: 1,
+        launch_url: 'http://books.google.com/ebooks?source=chrome-app',
+        name: 'Google Books',
+        options_url: ''
+    },
+    {
+        app_launch_index: 4,
+        description: 'Find local business information, directions, and ' +
+            'street-level imagery around the world with Google Maps.',
+        icon_big: 'standalone/googlemaps-icon.png',
+        icon_small: 'standalone/googlemaps-favicon.png',
+        id: 'lneaknkopdijkpnocmklfnjbeapigfbh',
+        launch_container: 2,
+        launch_type: 1,
+        launch_url: 'http://maps.google.com/',
+        name: 'Google Maps',
+        options_url: ''
+    },
+    {
+        app_launch_index: 5,
+        description: 'Create the longest path possible and challenge your ' +
+            'friends in the game of Entanglement.',
+        icon_big: 'standalone/entaglement-icon.png',
+        id: 'aciahcmjmecflokailenpkdchphgkefd',
+        launch_container: 2,
+        launch_type: 1,
+        launch_url: 'http://entanglement.gopherwoodstudios.com/',
+        name: 'Entanglement',
+        options_url: ''
+    },
+    {
+        name: 'NYTimes',
+        app_launch_index: 6,
+        description: 'The New York Times App for the Chrome Web Store.',
+        icon_big: 'standalone/nytimes-icon.png',
+        id: 'ecmphppfkcfflgglcokcbdkofpfegoel',
+        launch_container: 2,
+        launch_type: 1,
+        launch_url: 'http://www.nytimes.com/chrome/',
+        options_url: '',
+        page_index: 2
+    },
+    {
+        app_launch_index: 7,
+        description: 'The world\'s most popular online video community.',
+        id: 'blpcfgokakmgnkcojhhkbfbldkacnbeo',
+        icon_big: 'standalone/youtube-icon.png',
+        launch_container: 2,
+        launch_type: 1,
+        launch_url: 'http://www.youtube.com/',
+        name: 'YouTube',
+        options_url: '',
+        page_index: 3
+    }];
+
+    // For testing
+    apps = spamApps(apps);
+
+    /**
+     * Invoke the getAppsCallback function with a snapshot of the current app
+     * database.
+     */
+    function sendGetAppsCallback()
+    {
+        // We don't want to hand out our array directly because the NTP will
+        // assume it owns the array and is free to modify it.  For now we make a
+        // one-level deep copy of the array (since cloning the whole thing is
+        // more work and unnecessary at the moment).
+        var appsData = {
+            showPromo: false,
+            showLauncher: true,
+            apps: apps.slice(0)
+        };
+        getAppsCallback(appsData);
+    }
+
+    /**
+     * To make testing real-world scenarios easier, this expands our list of
+     * apps by duplicating them a number of times
+     */
+    function spamApps(apps)
+    {
+        // Create an object that extends another object
+        // This is an easy/efficient way to make slightly modified copies of our
+        // app objects without having to do a deep copy
+        function createObject(proto) {
+            /** @constructor */
+            var F = function() {};
+            F.prototype = proto;
+            return new F();
+        }
+
+        var newApps = [];
+        var pages = Math.floor(Math.random() * 8) + 1;
+        var idx = 1;
+        for (var p = 0; p < pages; p++) {
+            var count = Math.floor(Math.random() * 18) + 1;
+            for (var a = 0; a < count; a++) {
+                var i = Math.floor(Math.random() * apps.length);
+                var newApp = createObject(apps[i]);
+                newApp.page_index = p;
+                newApp.app_launch_index = idx;
+                // Uniqify the ID
+                newApp.id = apps[i].id + '-' + idx;
+                idx++;
+                newApps.push(newApp);
+            }
+        }
+        return newApps;
+    }
+
+    /**
+     * Like Array.prototype.indexOf but calls a predicate to test for match
+     *
+     * @param {Array} array The array to search.
+     * @param {function(Object): boolean} predicate The function to invoke on
+     *     each element.
+     * @return {number} First index at which predicate returned true, or -1.
+     */
+    function indexOfPred(array, predicate)
+    {
+        for (var i = 0; i < array.length; i++) {
+            if (predicate(array[i])) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    /**
+     * Get index into apps of an application object
+     * Requires the specified app to be present
+     *
+     * @param {string} id The ID of the application to locate.
+     * @return {number} The index in apps for an object with the specified ID.
+     */
+    function getAppIndex(id)
+    {
+        var i = indexOfPred(apps, function(e) { return e.id === id;});
+        if (i == -1) {
+            alert('Error: got unexpected App ID');
+        }
+        return i;
+    }
+
+    /**
+     * Get an application object given the application ID
+     * Requires
+     * @param {string} id The application ID to search for.
+     * @return {Object} The corresponding application object.
+     */
+    function getApp(id)
+    {
+        return apps[getAppIndex(id)];
+    }
+
+    /**
+     * Simlulate the launching of an application
+     *
+     * @param {string} id The ID of the application to launch.
+     */
+    function launchApp(id)
+    {
+        // Note that we don't do anything with the icon location.
+        // That's used by Chrome only on Windows to animate the icon during
+        // launch.
+        var app = getApp(id);
+        switch (parseInt(app.launch_type, 10)) {
+            case 0: // pinned
+            case 1: // regular
+
+                // Replace the current tab with the app.
+                // Pinned seems to omit the tab title, but I doubt it's
+                // possible for us to do that here
+                window.location = (app.launch_url);
+                break;
+
+            case 2: // fullscreen
+            case 3: // window
+                // attempt to launch in a new window
+                window.close();
+                window.open(app.launch_url, app.name,
+                'resizable=yes,scrollbars=yes,status=yes');
+                break;
+
+            default:
+                alert('Unexpected launch type: ' + app.launch_type);
+        }
+    }
+
+    /**
+     * Simulate uninstall of an app
+     * @param {string} id The ID of the application to uninstall.
+     */
+    function uninstallApp(id) {
+        var i = getAppIndex(id);
+        // This confirmation dialog doesn't look exactly the same as the
+        // standard NTP one, but it's close enough.
+        if (window.confirm('Uninstall \"' + apps[i].name + '\"?')) {
+            apps.splice(i, 1);
+            sendGetAppsCallback();
+        }
+    }
+
+    /**
+     * Update the app_launch_index of all apps
+     * @param {Array.<string>} appIds All app IDs in their desired order.
+     */
+    function reorderApps(movedAppId, appIds) {
+      assert(apps.length == appIds.length, 'Expected all apps in reorderApps');
+
+      // Clear the launch indicies so we can easily verify no dups
+      apps.forEach(function(a) {
+        a.app_launch_index = -1;
+        });
+
+      for (var i = 0; i < appIds.length; i++) {
+        var a = getApp(appIds[i]);
+        assert(a.app_launch_index == -1,
+               'Found duplicate appId in reorderApps');
+        a.app_launch_index = i;
+      }
+      sendGetAppsCallback();
+    }
+
+    /**
+     * Update the page number of an app
+     * @param {string} id The ID of the application to move.
+     * @param {number} page The page index to place the app.
+     */
+    function setPageIndex(id, page) {
+      var app = getApp(id);
+      app.page_index = page;
+    }
+
+    // The 'send' function
+    /**
+     * The chrome server communication entrypoint.
+     *
+     * @param {string} command Name of the command to send.
+     * @param {Array} args Array of command-specific arguments.
+     */
+    return function(command, args) {
+      // Chrome API is async
+      window.setTimeout(function() {
+        switch (command) {
+          // called to populate the list of applications
+          case 'getApps':
+            sendGetAppsCallback();
+            break;
+
+          // Called when an app is launched
+          // Ignore additional arguments - they've been changing over time and
+          // we don't use them in our NTP anyway.
+          case 'launchApp':
+            launchApp(args[0]);
+            break;
+
+          // Called when an app is uninstalled
+          case 'uninstallApp':
+            uninstallApp(args[0]);
+            break;
+
+          // Called when an app is repositioned in the touch NTP
+          case 'reorderApps':
+            reorderApps(args[0], args[1]);
+            break;
+
+          // Called when an app is moved to a different page
+          case 'setPageIndex':
+            setPageIndex(args[0], parseInt(args[1], 10));
+            break;
+
+          default:
+              throw new Error('Unexpected chrome command: ' + command);
+              break;
+        }
+      }, 0);
+    };
+})();
+
+/* A static templateData with english resources */
+var templateData = {
+  title: 'Standalone New Tab',
+  web_store_title: 'Web Store',
+  web_store_url: 'https://chrome.google.com/webstore?hl=en-US'
+};
+
+/* Hook construction of chrome://theme URLs */
+function themeUrlMapper(resourceName) {
+  if (resourceName == 'IDR_WEBSTORE_ICON') {
+    return 'standalone/webstore_icon.png';
+  }
+  return undefined;
+}
+
+/*
+ * On iOS we need a hack to avoid spurious click events
+ * In particular, if the user delays briefly between first touching and starting
+ * to drag, when the user releases a click event will be generated.
+ * Note that this seems to happen regardless of whether we do preventDefault on
+ * touchmove events.
+ */
+if (/iPhone|iPod|iPad/.test(navigator.userAgent) &&
+      !(/Chrome/.test(navigator.userAgent))) {
+  // We have a real iOS device (no a ChromeOS device pretending to be iOS)
+  (function() {
+    // True if a gesture is occuring that should cause clicks to be swallowed
+    var gestureActive = false;
+
+    // The position a touch was last started
+    var lastTouchStartPosition;
+
+    // Distance which a touch needs to move to be considered a drag
+    var DRAG_DISTANCE = 3;
+
+    document.addEventListener('touchstart', function(event) {
+        lastTouchStartPosition = {
+          x: event.touches[0].clientX,
+          y: event.touches[0].clientY
+        };
+        // A touchstart ALWAYS preceeds a click (valid or not), so cancel any
+        // outstanding gesture. Also, any multi-touch is a gesture that should
+        // prevent clicks.
+        gestureActive = event.touches.length > 1;
+      }, true);
+
+    document.addEventListener('touchmove', function(event) {
+        // When we see a move, measure the distance from the last touchStart
+        // If this is a multi-touch then the work here is irrelevant
+        // (gestureActive is already true)
+        var t = event.touches[0];
+        if (Math.abs(t.clientX - lastTouchStartPosition.x) > DRAG_DISTANCE ||
+            Math.abs(t.clientY - lastTouchStartPosition.y) > DRAG_DISTANCE) {
+          gestureActive = true;
+        }
+      }, true);
+
+    document.addEventListener('click', function(event) {
+        // If we got here without gestureActive being set then it means we had
+        // a touchStart without any real dragging before touchEnd - we can allow
+        // the click to proceed.
+        if (gestureActive) {
+          event.preventDefault();
+          event.stopPropagation();
+        }
+      }, true);
+
+  })();
+}
+
+/*  Hack to add Element.classList to older browsers that don't yet support it.
+    From https://developer.mozilla.org/en/DOM/element.classList.
+*/
+if (typeof Element !== 'undefined' &&
+    !Element.prototype.hasOwnProperty('classList')) {
+  (function() {
+    var classListProp = 'classList',
+        protoProp = 'prototype',
+        elemCtrProto = Element[protoProp],
+        objCtr = Object,
+        strTrim = String[protoProp].trim || function() {
+            return this.replace(/^\s+|\s+$/g, '');
+        },
+        arrIndexOf = Array[protoProp].indexOf || function(item) {
+            for (var i = 0, len = this.length; i < len; i++) {
+                if (i in this && this[i] === item) {
+                    return i;
+                }
+            }
+            return -1;
+        },
+        // Vendors: please allow content code to instantiate DOMExceptions
+        /** @constructor  */
+        DOMEx = function(type, message) {
+            this.name = type;
+            this.code = DOMException[type];
+            this.message = message;
+        },
+        checkTokenAndGetIndex = function(classList, token) {
+            if (token === '') {
+                throw new DOMEx(
+                      'SYNTAX_ERR',
+                      'An invalid or illegal string was specified'
+                );
+            }
+            if (/\s/.test(token)) {
+                throw new DOMEx(
+                      'INVALID_CHARACTER_ERR',
+                      'String contains an invalid character'
+                );
+            }
+            return arrIndexOf.call(classList, token);
+        },
+        /** @constructor
+         *  @extends Array */
+        ClassList = function(elem) {
+            var trimmedClasses = strTrim.call(elem.className),
+                classes = trimmedClasses ? trimmedClasses.split(/\s+/) : [];
+
+            for (var i = 0, len = classes.length; i < len; i++) {
+                this.push(classes[i]);
+            }
+            this._updateClassName = function() {
+                elem.className = this.toString();
+            };
+        },
+        classListProto = ClassList[protoProp] = [],
+        classListGetter = function() {
+            return new ClassList(this);
+        };
+
+    // Most DOMException implementations don't allow calling DOMException's
+    // toString() on non-DOMExceptions. Error's toString() is sufficient here.
+    DOMEx[protoProp] = Error[protoProp];
+    classListProto.item = function(i) {
+        return this[i] || null;
+    };
+    classListProto.contains = function(token) {
+        token += '';
+        return checkTokenAndGetIndex(this, token) !== -1;
+    };
+    classListProto.add = function(token) {
+        token += '';
+        if (checkTokenAndGetIndex(this, token) === -1) {
+            this.push(token);
+            this._updateClassName();
+        }
+    };
+    classListProto.remove = function(token) {
+        token += '';
+        var index = checkTokenAndGetIndex(this, token);
+        if (index !== -1) {
+            this.splice(index, 1);
+            this._updateClassName();
+        }
+    };
+    classListProto.toggle = function(token) {
+        token += '';
+        if (checkTokenAndGetIndex(this, token) === -1) {
+            this.add(token);
+        } else {
+            this.remove(token);
+        }
+    };
+    classListProto.toString = function() {
+        return this.join(' ');
+    };
+
+    if (objCtr.defineProperty) {
+        var classListDescriptor = {
+              get: classListGetter,
+              enumerable: true,
+              configurable: true
+        };
+        objCtr.defineProperty(elemCtrProto, classListProp, classListDescriptor);
+    } else if (objCtr[protoProp].__defineGetter__) {
+        elemCtrProto.__defineGetter__(classListProp, classListGetter);
+    }
+  }());
+}
+
+/* Hack to add Function.bind to older browsers that don't yet support it. From:
+   https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind
+*/
+if (!Function.prototype.bind) {
+  /**
+   * @param {Object} selfObj Specifies the object which |this| should
+   *     point to when the function is run. If the value is null or undefined,
+   *     it will default to the global object.
+   * @param {...*} var_args Additional arguments that are partially
+   *     applied to the function.
+   * @return {!Function} A partially-applied form of the function bind() was
+   *     invoked as a method of.
+   *  @suppress {duplicate}
+   */
+  Function.prototype.bind = function(selfObj, var_args) {
+    var slice = [].slice,
+        args = slice.call(arguments, 1),
+        self = this,
+        /** @constructor  */
+        nop = function() {},
+        bound = function() {
+          return self.apply(this instanceof nop ? this : (selfObj || {}),
+                              args.concat(slice.call(arguments)));
+        };
+    nop.prototype = self.prototype;
+    bound.prototype = new nop();
+    return bound;
+  };
+}
+