Roll Observatory packages and add a roll script

charted/lib/selection/src/transition_impl.dart

-/*
- * Copyright 2014 Google Inc. All rights reserved.
- *
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file or at
- * https://developers.google.com/open-source/licenses/bsd
- */
-part of charted.selection.transition;
-
-// handle transitions on an element-basis, so we can cancel if another is
-// scheduled
-Map<Element, int> _transitionMap = {};
-
-class _TransitionImpl implements Transition {
-  SelectionCallback _delay = (d, i, c) => 0;
-  SelectionCallback _duration =
-      (d, i, c) => Transition.defaultDurationMilliseconds;
-  Selection _selection;
-  Map _attrs = {};
-  Map _styles = {};
-  Map _attrTweens = {};
-  Map _styleTweens = {};
-  Map<AnimationTimer, Element> _timerMap = {};
-  Map<Element, List<Map>> _attrMap = {};
-  Map<Element, int> _durationMap = {};
-  bool _interrupted = false;
-  bool _remove = false;
-  var _timerDelay = 0;
-
-  _TransitionImpl(this._selection, [num delay = 0]) {
-    _transitionNode(delay);
-    _timerDelay = delay;
-  }
-
-  Interpolator ease = clampEasingFn(
-          Transition.defaultEasingMode(Transition.defaultEasingType));
-
-  void delay(int millisecond) {
-    delayWithCallback(toCallback(millisecond));
-  }
-
-  void delayWithCallback(SelectionCallback fn) {
-    _delay = fn;
-  }
-
-  void duration(int millisecond) {
-    durationWithCallback(toCallback(millisecond));
-  }
-
-  void durationWithCallback(SelectionCallback fn) {
-    _duration = fn;
-  }
-
-  void attr(String name, val) {
-    attrWithCallback(name, toCallback(val));
-  }
-
-  void attrWithCallback(String name, SelectionCallback fn) {
-    _attrs[name] = fn;
-  }
-
-  void attrTween(String name, AttrTweenCallback tween) {
-    _attrTweens[name] = tween;
-  }
-
-  void style(String property, String val, [String priority = '']) {
-    styleWithCallback(property, toCallback(val), priority);
-  }
-
-  void styleWithCallback(String property, SelectionCallback<String> fn,
-      [String priority = '']) {
-    _styles[property] = {'callback': fn, 'priority': priority};
-  }
-
-  void styleTween(String property, StyleTweenCallback tween,
-      [String priority]) {
-    _styleTweens[property] = {'callback': tween, 'priority': priority};
-  }
-
-  // Starts a timer that registers all attributes, durations, and delays for the
-  // transition of the current selection.
-  _transitionNode(num delay) {
-    new AnimationTimer((elapsed) {
-      _selection.each((d, i, c) {
-        var tweenList = [];
-        _attrs.forEach((key, value) {
-            tweenList.add(_getAttrInterpolator(c, key, value(d, i, c)));
-        });
-        _attrTweens.forEach((key, value) {
-          tweenList.add((t) => c.setAttribute(key,
-              value(d, i, c.getAttribute(key))(t)));
-        });
-        _styles.forEach((key, value) {
-            tweenList.add(_getStyleInterpolator(c, key,
-                value['callback'](d, i, c), value['priority']));
-        });
-        _styleTweens.forEach((key, value) {
-          tweenList.add((t) => c.style.setProperty(key,
-              value['callback'](d, i,
-              c.style.getPropertyValue(key))(t).toString(), value['priority']));
-        });
-
-        _attrMap[c] = tweenList;
-        _durationMap[c] = _duration(d, i, c);
-        _timerMap[new AnimationTimer(_tick, delay: _delay(d, i, c))] = c;
-
-        if(!_transitionMap.containsKey(c)) {
-          _transitionMap[c] = 1;
-        } else {
-          _transitionMap[c]++;
-        }
-      });
-      return true;
-    }, delay: delay);
-  }
-
-  // Returns the correct interpolator function for the old and new attribute.
-  _getAttrInterpolator(Element element, String attrName, newValue) {
-    var attr = element.attributes[attrName];
-    var interpolator = createStringInterpolator(attr, newValue.toString());
-    return (t) => element.setAttribute(attrName, interpolator(t).toString());
-  }
-
-  // Returns the correct interpolator function for the old and new style.
-  _getStyleInterpolator(Element element, String styleName, newValue, priority) {
-    var style = element.style.getPropertyValue(styleName);
-
-    var interpolator = createStringInterpolator(style, newValue.toString());
-
-    return (t) => element.style.setProperty(styleName,
-        interpolator(t).toString(), priority);
-  }
-
-  // Ticks of the transition, this is the callback registered to the
-  // ChartedTimer, called on each animation frame until the transition duration
-  // has been reached.
-  bool _tick(elapsed) {
-    if (_interrupted) {
-      return true;
-    }
-    var activeNode = _timerMap[AnimationTimer.active];
-    var t = elapsed / _durationMap[activeNode];
-    for (Interpolator tween in _attrMap[activeNode]) {
-      tween(ease(t));
-    }
-
-    if (t >= 1) {
-      if (_remove && _transitionMap[activeNode] == 1) {
-        activeNode.remove();
-      }
-
-      if(_transitionMap[activeNode] > 1) {
-        _transitionMap[activeNode]--;
-      } else {
-        _transitionMap.remove(activeNode);
-      }
-
-      return true;
-    }
-
-    return false;
-  }
-
-  // Interrupts the transition.
-  void interrupt() {
-    _interrupted = true;
-  }
-
-  Transition select(String selector) {
-    var t = new Transition(_selection.select(selector));
-    t.ease = ease;
-    t.delayWithCallback(_delay);
-    t.durationWithCallback(_duration);
-    return t;
-  }
-
-  Transition selectAll(String selector) {
-    var t = new Transition(_selection.selectAll(selector));
-    t.ease = ease;
-    t.delayWithCallback(_delay);
-    t.durationWithCallback(_duration);
-    return t;
-  }
-
-  Transition transition() {
-    var e = _selection.first;
-    var delay = _delay(_selection.scope.datum(e), 0, e) +
-        _duration(_selection.scope.datum(e), 0, e) + _timerDelay;
-    var t = new _TransitionImpl(_selection, delay);
-    t.ease = ease;
-    t.durationWithCallback(_duration);
-    return t;
-  }
-
-  void remove() {
-    _remove = true;
-  }
-}