<NME> angular-touch.js
<BEF> ADDFILE
<MSG> add angular js for docs

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+/**
+ * @license AngularJS v1.2.18
+ * (c) 2010-2014 Google, Inc. http://angularjs.org
+ * License: MIT
+ */
+(function(window, angular, undefined) {'use strict';
+
+/**
+ * @ngdoc module
+ * @name ngTouch
+ * @description
+ *
+ * # ngTouch
+ *
+ * The `ngTouch` module provides touch events and other helpers for touch-enabled devices.
+ * The implementation is based on jQuery Mobile touch event handling
+ * ([jquerymobile.com](http://jquerymobile.com/)).
+ *
+ *
+ * See {@link ngTouch.$swipe `$swipe`} for usage.
+ *
+ * <div doc-module-components="ngTouch"></div>
+ *
+ */
+
+// define ngTouch module
+/* global -ngTouch */
+var ngTouch = angular.module('ngTouch', []);
+
+/* global ngTouch: false */
+
+    /**
+     * @ngdoc service
+     * @name $swipe
+     *
+     * @description
+     * The `$swipe` service is a service that abstracts the messier details of hold-and-drag swipe
+     * behavior, to make implementing swipe-related directives more convenient.
+     *
+     * Requires the {@link ngTouch `ngTouch`} module to be installed.
+     *
+     * `$swipe` is used by the `ngSwipeLeft` and `ngSwipeRight` directives in `ngTouch`, and by
+     * `ngCarousel` in a separate component.
+     *
+     * # Usage
+     * The `$swipe` service is an object with a single method: `bind`. `bind` takes an element
+     * which is to be watched for swipes, and an object with four handler functions. See the
+     * documentation for `bind` below.
+     */
+
+ngTouch.factory('$swipe', [function() {
+  // The total distance in any direction before we make the call on swipe vs. scroll.
+  var MOVE_BUFFER_RADIUS = 10;
+
+  function getCoordinates(event) {
+    var touches = event.touches && event.touches.length ? event.touches : [event];
+    var e = (event.changedTouches && event.changedTouches[0]) ||
+        (event.originalEvent && event.originalEvent.changedTouches &&
+            event.originalEvent.changedTouches[0]) ||
+        touches[0].originalEvent || touches[0];
+
+    return {
+      x: e.clientX,
+      y: e.clientY
+    };
+  }
+
+  return {
+    /**
+     * @ngdoc method
+     * @name $swipe#bind
+     *
+     * @description
+     * The main method of `$swipe`. It takes an element to be watched for swipe motions, and an
+     * object containing event handlers.
+     *
+     * The four events are `start`, `move`, `end`, and `cancel`. `start`, `move`, and `end`
+     * receive as a parameter a coordinates object of the form `{ x: 150, y: 310 }`.
+     *
+     * `start` is called on either `mousedown` or `touchstart`. After this event, `$swipe` is
+     * watching for `touchmove` or `mousemove` events. These events are ignored until the total
+     * distance moved in either dimension exceeds a small threshold.
+     *
+     * Once this threshold is exceeded, either the horizontal or vertical delta is greater.
+     * - If the horizontal distance is greater, this is a swipe and `move` and `end` events follow.
+     * - If the vertical distance is greater, this is a scroll, and we let the browser take over.
+     *   A `cancel` event is sent.
+     *
+     * `move` is called on `mousemove` and `touchmove` after the above logic has determined that
+     * a swipe is in progress.
+     *
+     * `end` is called when a swipe is successfully completed with a `touchend` or `mouseup`.
+     *
+     * `cancel` is called either on a `touchcancel` from the browser, or when we begin scrolling
+     * as described above.
+     *
+     */
+    bind: function(element, eventHandlers) {
+      // Absolute total movement, used to control swipe vs. scroll.
+      var totalX, totalY;
+      // Coordinates of the start position.
+      var startCoords;
+      // Last event's position.
+      var lastPos;
+      // Whether a swipe is active.
+      var active = false;
+
+      element.on('touchstart mousedown', function(event) {
+        startCoords = getCoordinates(event);
+        active = true;
+        totalX = 0;
+        totalY = 0;
+        lastPos = startCoords;
+        eventHandlers['start'] && eventHandlers['start'](startCoords, event);
+      });
+
+      element.on('touchcancel', function(event) {
+        active = false;
+        eventHandlers['cancel'] && eventHandlers['cancel'](event);
+      });
+
+      element.on('touchmove mousemove', function(event) {
+        if (!active) return;
+
+        // Android will send a touchcancel if it thinks we're starting to scroll.
+        // So when the total distance (+ or - or both) exceeds 10px in either direction,
+        // we either:
+        // - On totalX > totalY, we send preventDefault() and treat this as a swipe.
+        // - On totalY > totalX, we let the browser handle it as a scroll.
+
+        if (!startCoords) return;
+        var coords = getCoordinates(event);
+
+        totalX += Math.abs(coords.x - lastPos.x);
+        totalY += Math.abs(coords.y - lastPos.y);
+
+        lastPos = coords;
+
+        if (totalX < MOVE_BUFFER_RADIUS && totalY < MOVE_BUFFER_RADIUS) {
+          return;
+        }
+
+        // One of totalX or totalY has exceeded the buffer, so decide on swipe vs. scroll.
+        if (totalY > totalX) {
+          // Allow native scrolling to take over.
+          active = false;
+          eventHandlers['cancel'] && eventHandlers['cancel'](event);
+          return;
+        } else {
+          // Prevent the browser from scrolling.
+          event.preventDefault();
+          eventHandlers['move'] && eventHandlers['move'](coords, event);
+        }
+      });
+
+      element.on('touchend mouseup', function(event) {
+        if (!active) return;
+        active = false;
+        eventHandlers['end'] && eventHandlers['end'](getCoordinates(event), event);
+      });
+    }
+  };
+}]);
+
+/* global ngTouch: false */
+
+/**
+ * @ngdoc directive
+ * @name ngClick
+ *
+ * @description
+ * A more powerful replacement for the default ngClick designed to be used on touchscreen
+ * devices. Most mobile browsers wait about 300ms after a tap-and-release before sending
+ * the click event. This version handles them immediately, and then prevents the
+ * following click event from propagating.
+ *
+ * Requires the {@link ngTouch `ngTouch`} module to be installed.
+ *
+ * This directive can fall back to using an ordinary click event, and so works on desktop
+ * browsers as well as mobile.
+ *
+ * This directive also sets the CSS class `ng-click-active` while the element is being held
+ * down (by a mouse click or touch) so you can restyle the depressed element if you wish.
+ *
+ * @element ANY
+ * @param {expression} ngClick {@link guide/expression Expression} to evaluate
+ * upon tap. (Event object is available as `$event`)
+ *
+ * @example
+    <example module="ngClickExample" deps="angular-touch.js">
+      <file name="index.html">
+        <button ng-click="count = count + 1" ng-init="count=0">
+          Increment
+        </button>
+        count: {{ count }}
+      </file>
+      <file name="script.js">
+        angular.module('ngClickExample', ['ngTouch']);
+      </file>
+    </example>
+ */
+
+ngTouch.config(['$provide', function($provide) {
+  $provide.decorator('ngClickDirective', ['$delegate', function($delegate) {
+    // drop the default ngClick directive
+    $delegate.shift();
+    return $delegate;
+  }]);
+}]);
+
+ngTouch.directive('ngClick', ['$parse', '$timeout', '$rootElement',
+    function($parse, $timeout, $rootElement) {
+  var TAP_DURATION = 750; // Shorter than 750ms is a tap, longer is a taphold or drag.
+  var MOVE_TOLERANCE = 12; // 12px seems to work in most mobile browsers.
+  var PREVENT_DURATION = 2500; // 2.5 seconds maximum from preventGhostClick call to click
+  var CLICKBUSTER_THRESHOLD = 25; // 25 pixels in any dimension is the limit for busting clicks.
+
+  var ACTIVE_CLASS_NAME = 'ng-click-active';
+  var lastPreventedTime;
+  var touchCoordinates;
+  var lastLabelClickCoordinates;
+
+
+  // TAP EVENTS AND GHOST CLICKS
+  //
+  // Why tap events?
+  // Mobile browsers detect a tap, then wait a moment (usually ~300ms) to see if you're
+  // double-tapping, and then fire a click event.
+  //
+  // This delay sucks and makes mobile apps feel unresponsive.
+  // So we detect touchstart, touchmove, touchcancel and touchend ourselves and determine when
+  // the user has tapped on something.
+  //
+  // What happens when the browser then generates a click event?
+  // The browser, of course, also detects the tap and fires a click after a delay. This results in
+  // tapping/clicking twice. We do "clickbusting" to prevent it.
+  //
+  // How does it work?
+  // We attach global touchstart and click handlers, that run during the capture (early) phase.
+  // So the sequence for a tap is:
+  // - global touchstart: Sets an "allowable region" at the point touched.
+  // - element's touchstart: Starts a touch
+  // (- touchmove or touchcancel ends the touch, no click follows)
+  // - element's touchend: Determines if the tap is valid (didn't move too far away, didn't hold
+  //   too long) and fires the user's tap handler. The touchend also calls preventGhostClick().
+  // - preventGhostClick() removes the allowable region the global touchstart created.
+  // - The browser generates a click event.
+  // - The global click handler catches the click, and checks whether it was in an allowable region.
+  //     - If preventGhostClick was called, the region will have been removed, the click is busted.
+  //     - If the region is still there, the click proceeds normally. Therefore clicks on links and
+  //       other elements without ngTap on them work normally.
+  //
+  // This is an ugly, terrible hack!
+  // Yeah, tell me about it. The alternatives are using the slow click events, or making our users
+  // deal with the ghost clicks, so I consider this the least of evils. Fortunately Angular
+  // encapsulates this ugly logic away from the user.
+  //
+  // Why not just put click handlers on the element?
+  // We do that too, just to be sure. If the tap event caused the DOM to change,
+  // it is possible another element is now in that position. To take account for these possibly
+  // distinct elements, the handlers are global and care only about coordinates.
+
+  // Checks if the coordinates are close enough to be within the region.
+  function hit(x1, y1, x2, y2) {
+    return Math.abs(x1 - x2) < CLICKBUSTER_THRESHOLD && Math.abs(y1 - y2) < CLICKBUSTER_THRESHOLD;
+  }
+
+  // Checks a list of allowable regions against a click location.
+  // Returns true if the click should be allowed.
+  // Splices out the allowable region from the list after it has been used.
+  function checkAllowableRegions(touchCoordinates, x, y) {
+    for (var i = 0; i < touchCoordinates.length; i += 2) {
+      if (hit(touchCoordinates[i], touchCoordinates[i+1], x, y)) {
+        touchCoordinates.splice(i, i + 2);
+        return true; // allowable region
+      }
+    }
+    return false; // No allowable region; bust it.
+  }
+
+  // Global click handler that prevents the click if it's in a bustable zone and preventGhostClick
+  // was called recently.
+  function onClick(event) {
+    if (Date.now() - lastPreventedTime > PREVENT_DURATION) {
+      return; // Too old.
+    }
+
+    var touches = event.touches && event.touches.length ? event.touches : [event];
+    var x = touches[0].clientX;
+    var y = touches[0].clientY;
+    // Work around desktop Webkit quirk where clicking a label will fire two clicks (on the label
+    // and on the input element). Depending on the exact browser, this second click we don't want
+    // to bust has either (0,0), negative coordinates, or coordinates equal to triggering label
+    // click event
+    if (x < 1 && y < 1) {
+      return; // offscreen
+    }
+    if (lastLabelClickCoordinates &&
+        lastLabelClickCoordinates[0] === x && lastLabelClickCoordinates[1] === y) {
+      return; // input click triggered by label click
+    }
+    // reset label click coordinates on first subsequent click
+    if (lastLabelClickCoordinates) {
+      lastLabelClickCoordinates = null;
+    }
+    // remember label click coordinates to prevent click busting of trigger click event on input
+    if (event.target.tagName.toLowerCase() === 'label') {
+      lastLabelClickCoordinates = [x, y];
+    }
+
+    // Look for an allowable region containing this click.
+    // If we find one, that means it was created by touchstart and not removed by
+    // preventGhostClick, so we don't bust it.
+    if (checkAllowableRegions(touchCoordinates, x, y)) {
+      return;
+    }
+
+    // If we didn't find an allowable region, bust the click.
+    event.stopPropagation();
+    event.preventDefault();
+
+    // Blur focused form elements
+    event.target && event.target.blur();
+  }
+
+
+  // Global touchstart handler that creates an allowable region for a click event.
+  // This allowable region can be removed by preventGhostClick if we want to bust it.
+  function onTouchStart(event) {
+    var touches = event.touches && event.touches.length ? event.touches : [event];
+    var x = touches[0].clientX;
+    var y = touches[0].clientY;
+    touchCoordinates.push(x, y);
+
+    $timeout(function() {
+      // Remove the allowable region.
+      for (var i = 0; i < touchCoordinates.length; i += 2) {
+        if (touchCoordinates[i] == x && touchCoordinates[i+1] == y) {
+          touchCoordinates.splice(i, i + 2);
+          return;
+        }
+      }
+    }, PREVENT_DURATION, false);
+  }
+
+  // On the first call, attaches some event handlers. Then whenever it gets called, it creates a
+  // zone around the touchstart where clicks will get busted.
+  function preventGhostClick(x, y) {
+    if (!touchCoordinates) {
+      $rootElement[0].addEventListener('click', onClick, true);
+      $rootElement[0].addEventListener('touchstart', onTouchStart, true);
+      touchCoordinates = [];
+    }
+
+    lastPreventedTime = Date.now();
+
+    checkAllowableRegions(touchCoordinates, x, y);
+  }
+
+  // Actual linking function.
+  return function(scope, element, attr) {
+    var clickHandler = $parse(attr.ngClick),
+        tapping = false,
+        tapElement,  // Used to blur the element after a tap.
+        startTime,   // Used to check if the tap was held too long.
+        touchStartX,
+        touchStartY;
+
+    function resetState() {
+      tapping = false;
+      element.removeClass(ACTIVE_CLASS_NAME);
+    }
+
+    element.on('touchstart', function(event) {
+      tapping = true;
+      tapElement = event.target ? event.target : event.srcElement; // IE uses srcElement.
+      // Hack for Safari, which can target text nodes instead of containers.
+      if(tapElement.nodeType == 3) {
+        tapElement = tapElement.parentNode;
+      }
+
+      element.addClass(ACTIVE_CLASS_NAME);
+
+      startTime = Date.now();
+
+      var touches = event.touches && event.touches.length ? event.touches : [event];
+      var e = touches[0].originalEvent || touches[0];
+      touchStartX = e.clientX;
+      touchStartY = e.clientY;
+    });
+
+    element.on('touchmove', function(event) {
+      resetState();
+    });
+
+    element.on('touchcancel', function(event) {
+      resetState();
+    });
+
+    element.on('touchend', function(event) {
+      var diff = Date.now() - startTime;
+
+      var touches = (event.changedTouches && event.changedTouches.length) ? event.changedTouches :
+          ((event.touches && event.touches.length) ? event.touches : [event]);
+      var e = touches[0].originalEvent || touches[0];
+      var x = e.clientX;
+      var y = e.clientY;
+      var dist = Math.sqrt( Math.pow(x - touchStartX, 2) + Math.pow(y - touchStartY, 2) );
+
+      if (tapping && diff < TAP_DURATION && dist < MOVE_TOLERANCE) {
+        // Call preventGhostClick so the clickbuster will catch the corresponding click.
+        preventGhostClick(x, y);
+
+        // Blur the focused element (the button, probably) before firing the callback.
+        // This doesn't work perfectly on Android Chrome, but seems to work elsewhere.
+        // I couldn't get anything to work reliably on Android Chrome.
+        if (tapElement) {
+          tapElement.blur();
+        }
+
+        if (!angular.isDefined(attr.disabled) || attr.disabled === false) {
+          element.triggerHandler('click', [event]);
+        }
+      }
+
+      resetState();
+    });
+
+    // Hack for iOS Safari's benefit. It goes searching for onclick handlers and is liable to click
+    // something else nearby.
+    element.onclick = function(event) { };
+
+    // Actual click handler.
+    // There are three different kinds of clicks, only two of which reach this point.
+    // - On desktop browsers without touch events, their clicks will always come here.
+    // - On mobile browsers, the simulated "fast" click will call this.
+    // - But the browser's follow-up slow click will be "busted" before it reaches this handler.
+    // Therefore it's safe to use this directive on both mobile and desktop.
+    element.on('click', function(event, touchend) {
+      scope.$apply(function() {
+        clickHandler(scope, {$event: (touchend || event)});
+      });
+    });
+
+    element.on('mousedown', function(event) {
+      element.addClass(ACTIVE_CLASS_NAME);
+    });
+
+    element.on('mousemove mouseup', function(event) {
+      element.removeClass(ACTIVE_CLASS_NAME);
+    });
+
+  };
+}]);
+
+/* global ngTouch: false */
+
+/**
+ * @ngdoc directive
+ * @name ngSwipeLeft
+ *
+ * @description
+ * Specify custom behavior when an element is swiped to the left on a touchscreen device.
+ * A leftward swipe is a quick, right-to-left slide of the finger.
+ * Though ngSwipeLeft is designed for touch-based devices, it will work with a mouse click and drag
+ * too.
+ *
+ * Requires the {@link ngTouch `ngTouch`} module to be installed.
+ *
+ * @element ANY
+ * @param {expression} ngSwipeLeft {@link guide/expression Expression} to evaluate
+ * upon left swipe. (Event object is available as `$event`)
+ *
+ * @example
+    <example module="ngSwipeLeftExample" deps="angular-touch.js">
+      <file name="index.html">
+        <div ng-show="!showActions" ng-swipe-left="showActions = true">
+          Some list content, like an email in the inbox
+        </div>
+        <div ng-show="showActions" ng-swipe-right="showActions = false">
+          <button ng-click="reply()">Reply</button>
+          <button ng-click="delete()">Delete</button>
+        </div>
+      </file>
+      <file name="script.js">
+        angular.module('ngSwipeLeftExample', ['ngTouch']);
+      </file>
+    </example>
+ */
+
+/**
+ * @ngdoc directive
+ * @name ngSwipeRight
+ *
+ * @description
+ * Specify custom behavior when an element is swiped to the right on a touchscreen device.
+ * A rightward swipe is a quick, left-to-right slide of the finger.
+ * Though ngSwipeRight is designed for touch-based devices, it will work with a mouse click and drag
+ * too.
+ *
+ * Requires the {@link ngTouch `ngTouch`} module to be installed.
+ *
+ * @element ANY
+ * @param {expression} ngSwipeRight {@link guide/expression Expression} to evaluate
+ * upon right swipe. (Event object is available as `$event`)
+ *
+ * @example
+    <example module="ngSwipeRightExample" deps="angular-touch.js">
+      <file name="index.html">
+        <div ng-show="!showActions" ng-swipe-left="showActions = true">
+          Some list content, like an email in the inbox
+        </div>
+        <div ng-show="showActions" ng-swipe-right="showActions = false">
+          <button ng-click="reply()">Reply</button>
+          <button ng-click="delete()">Delete</button>
+        </div>
+      </file>
+      <file name="script.js">
+        angular.module('ngSwipeRightExample', ['ngTouch']);
+      </file>
+    </example>
+ */
+
+function makeSwipeDirective(directiveName, direction, eventName) {
+  ngTouch.directive(directiveName, ['$parse', '$swipe', function($parse, $swipe) {
+    // The maximum vertical delta for a swipe should be less than 75px.
+    var MAX_VERTICAL_DISTANCE = 75;
+    // Vertical distance should not be more than a fraction of the horizontal distance.
+    var MAX_VERTICAL_RATIO = 0.3;
+    // At least a 30px lateral motion is necessary for a swipe.
+    var MIN_HORIZONTAL_DISTANCE = 30;
+
+    return function(scope, element, attr) {
+      var swipeHandler = $parse(attr[directiveName]);
+
+      var startCoords, valid;
+
+      function validSwipe(coords) {
+        // Check that it's within the coordinates.
+        // Absolute vertical distance must be within tolerances.
+        // Horizontal distance, we take the current X - the starting X.
+        // This is negative for leftward swipes and positive for rightward swipes.
+        // After multiplying by the direction (-1 for left, +1 for right), legal swipes
+        // (ie. same direction as the directive wants) will have a positive delta and
+        // illegal ones a negative delta.
+        // Therefore this delta must be positive, and larger than the minimum.
+        if (!startCoords) return false;
+        var deltaY = Math.abs(coords.y - startCoords.y);
+        var deltaX = (coords.x - startCoords.x) * direction;
+        return valid && // Short circuit for already-invalidated swipes.
+            deltaY < MAX_VERTICAL_DISTANCE &&
+            deltaX > 0 &&
+            deltaX > MIN_HORIZONTAL_DISTANCE &&
+            deltaY / deltaX < MAX_VERTICAL_RATIO;
+      }
+
+      $swipe.bind(element, {
+        'start': function(coords, event) {
+          startCoords = coords;
+          valid = true;
+        },
+        'cancel': function(event) {
+          valid = false;
+        },
+        'end': function(coords, event) {
+          if (validSwipe(coords)) {
+            scope.$apply(function() {
+              element.triggerHandler(eventName);
+              swipeHandler(scope, {$event: event});
+            });
+          }
+        }
+      });
+    };
+  }]);
+}
+
+// Left is negative X-coordinate, right is positive.
+makeSwipeDirective('ngSwipeLeft', -1, 'swipeleft');
+makeSwipeDirective('ngSwipeRight', 1, 'swiperight');
+
+
+
+})(window, window.angular);

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