effects.js

一本关于大学的书

/* ------------- prepackaged effects ------------- */

Effect.Fade = function(element) {
  options = Object.extend({
  from: 1.0,
  to:   0.0,
  afterFinish: function(effect) 
    { Element.hide(effect.element);
      effect.setOpacity(1); } 
  }, arguments[1] || {});
  return new Effect.Opacity(element,options);
}

Effect.Appear = function(element) {
  options = Object.extend({
  from: 0.0,
  to:   1.0,
  beforeStart: function(effect)  
    { effect.setOpacity(0);
      Element.show(effect.element); },
  afterUpdate: function(effect)  
    { Element.show(effect.element); }
  }, arguments[1] || {});
  return new Effect.Opacity(element,options);
}

Effect.Puff = function(element) {
  return new Effect.Parallel(
   [ new Effect.Scale(element, 200, { sync: true, scaleFromCenter: true }), 
     new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0 } ) ], 
     { duration: 1.0, 
      afterUpdate: function(effect) 
       { effect.effects[0].element.style.position = 'absolute'; },
      afterFinish: function(effect)
       { Element.hide(effect.effects[0].element); }
     }
   );
}

Effect.BlindUp = function(element) {
  Element.makeClipping(element);
  return new Effect.Scale(element, 0, 
    Object.extend({ scaleContent: false, 
      scaleX: false, 
      afterFinish: function(effect) 
        { 
          Element.hide(effect.element);
          Element.undoClipping(effect.element);
        } 
    }, arguments[1] || {})
  );
}

Effect.BlindDown = function(element) {
  $(element).style.height   = '0px';
  Element.makeClipping(element);
  Element.show(element);
  return new Effect.Scale(element, 100, 
    Object.extend({ scaleContent: false, 
      scaleX: false, 
      scaleMode: 'contents',
      scaleFrom: 0,
      afterFinish: function(effect) {
        Element.undoClipping(effect.element);
      }
    }, arguments[1] || {})
  );
}

Effect.SwitchOff = function(element) {
  return new Effect.Appear(element,
    { duration: 0.4,
     transition: Effect.Transitions.flicker,
     afterFinish: function(effect)
      { effect.element.style.overflow = 'hidden';
        new Effect.Scale(effect.element, 1, 
         { duration: 0.3, scaleFromCenter: true,
          scaleX: false, scaleContent: false,
          afterUpdate: function(effect) { 
           if(effect.element.style.position=="")
             effect.element.style.position = 'relative'; },
          afterFinish: function(effect) { Element.hide(effect.element); }
         } )
      }
    } );
}

Effect.DropOut = function(element) {
  return new Effect.Parallel(
    [ new Effect.MoveBy(element, 100, 0, { sync: true }), 
      new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0 } ) ], 
    { duration: 0.5, 
     afterFinish: function(effect)
       { Element.hide(effect.effects[0].element); } 
    });
}

Effect.Shake = function(element) {
  return new Effect.MoveBy(element, 0, 20, 
    { duration: 0.05, afterFinish: function(effect) {
  new Effect.MoveBy(effect.element, 0, -40, 
    { duration: 0.1, afterFinish: function(effect) { 
  new Effect.MoveBy(effect.element, 0, 40, 
    { duration: 0.1, afterFinish: function(effect) {  
  new Effect.MoveBy(effect.element, 0, -40, 
    { duration: 0.1, afterFinish: function(effect) {  
  new Effect.MoveBy(effect.element, 0, 40, 
    { duration: 0.1, afterFinish: function(effect) {  
  new Effect.MoveBy(effect.element, 0, -20, 
    { duration: 0.05, afterFinish: function(effect) {  
  }}) }}) }}) }}) }}) }});
}

Effect.SlideDown = function(element) {
  element = $(element);
  element.style.height   = '0px';
  Element.makeClipping(element);
  Element.cleanWhitespace(element);
  Element.makePositioned(element.firstChild);
  Element.show(element);
  return new Effect.Scale(element, 100, 
   Object.extend({ scaleContent: false, 
    scaleX: false, 
    scaleMode: 'contents',
    scaleFrom: 0,
    afterUpdate: function(effect) 
      { effect.element.firstChild.style.bottom = 
          (effect.originalHeight - effect.element.clientHeight) + 'px'; },
    afterFinish: function(effect) 
      {  Element.undoClipping(effect.element); }
    }, arguments[1] || {})
  );
}
  
Effect.SlideUp = function(element) {
  element = $(element);
  Element.makeClipping(element);
  Element.cleanWhitespace(element);
  Element.makePositioned(element.firstChild);
  Element.show(element);
  return new Effect.Scale(element, 0, 
   Object.extend({ scaleContent: false, 
    scaleX: false, 
    afterUpdate: function(effect) 
      { effect.element.firstChild.style.bottom = 
          (effect.originalHeight - effect.element.clientHeight) + 'px'; },
    afterFinish: function(effect)
      { 
        Element.hide(effect.element);
        Element.undoClipping(effect.element);
      }
   }, arguments[1] || {})
  );
}

Effect.Squish = function(element) {
 return new Effect.Scale(element, 0, 
   { afterFinish: function(effect) { Element.hide(effect.element); } });
}

Effect.Grow = function(element) {
  element = $(element);
  var options = arguments[1] || {};
  
  var originalWidth = element.clientWidth;
  var originalHeight = element.clientHeight;
  element.style.overflow = 'hidden';
  Element.show(element);
  
  var direction = options.direction || 'center';
  var moveTransition = options.moveTransition || Effect.Transitions.sinoidal;
  var scaleTransition = options.scaleTransition || Effect.Transitions.sinoidal;
  var opacityTransition = options.opacityTransition || Effect.Transitions.full;
  
  var initialMoveX, initialMoveY;
  var moveX, moveY;
  
  switch (direction) {
    case 'top-left':
      initialMoveX = initialMoveY = moveX = moveY = 0; 
      break;
    case 'top-right':
      initialMoveX = originalWidth;
      initialMoveY = moveY = 0;
      moveX = -originalWidth;
      break;
    case 'bottom-left':
      initialMoveX = moveX = 0;
      initialMoveY = originalHeight;
      moveY = -originalHeight;
      break;
    case 'bottom-right':
      initialMoveX = originalWidth;
      initialMoveY = originalHeight;
      moveX = -originalWidth;
      moveY = -originalHeight;
      break;
    case 'center':
      initialMoveX = originalWidth / 2;
      initialMoveY = originalHeight / 2;
      moveX = -originalWidth / 2;
      moveY = -originalHeight / 2;
      break;
  }
  
  return new Effect.MoveBy(element, initialMoveY, initialMoveX, { 
    duration: 0.01, 
    beforeUpdate: function(effect) { $(element).style.height = '0px'; },
    afterFinish: function(effect) {
      new Effect.Parallel(
        [ new Effect.Opacity(element, { sync: true, to: 1.0, from: 0.0, transition: opacityTransition }),
          new Effect.MoveBy(element, moveY, moveX, { sync: true, transition: moveTransition }),
          new Effect.Scale(element, 100, { 
            scaleMode: { originalHeight: originalHeight, originalWidth: originalWidth }, 
            sync: true, scaleFrom: 0, scaleTo: 100, transition: scaleTransition })],
        options); }
    });
}

Effect.Shrink = function(element) {
  element = $(element);
  var options = arguments[1] || {};
  
  var originalWidth = element.clientWidth;
  var originalHeight = element.clientHeight;
  element.style.overflow = 'hidden';
  Element.show(element);

  var direction = options.direction || 'center';
  var moveTransition = options.moveTransition || Effect.Transitions.sinoidal;
  var scaleTransition = options.scaleTransition || Effect.Transitions.sinoidal;
  var opacityTransition = options.opacityTransition || Effect.Transitions.none;
  
  var moveX, moveY;
  
  switch (direction) {
    case 'top-left':
      moveX = moveY = 0;
      break;
    case 'top-right':
      moveX = originalWidth;
      moveY = 0;
      break;
    case 'bottom-left':
      moveX = 0;
      moveY = originalHeight;
      break;
    case 'bottom-right':
      moveX = originalWidth;
      moveY = originalHeight;
      break;
    case 'center':  
      moveX = originalWidth / 2;
      moveY = originalHeight / 2;
      break;
  }
  
  return new Effect.Parallel(
    [ new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0, transition: opacityTransition }),
      new Effect.Scale(element, 0, { sync: true, transition: moveTransition }),
      new Effect.MoveBy(element, moveY, moveX, { sync: true, transition: scaleTransition }) ],
    options);
}

Effect.Pulsate = function(element) {
  var options    = arguments[1] || {};
  var transition = options.transition || Effect.Transitions.sinoidal;
  var reverser   = function(pos){ return transition(1-Effect.Transitions.pulse(pos)) };
  reverser.bind(transition);
  return new Effect.Opacity(element, 
    Object.extend(Object.extend({  duration: 3.0,
       afterFinish: function(effect) { Element.show(effect.element); }
    }, options), {transition: reverser}));
}

Effect.Fold = function(element) {
 $(element).style.overflow = 'hidden';
 return new Effect.Scale(element, 5, Object.extend({   
   scaleContent: false,
   scaleTo: 100,
   scaleX: false,
   afterFinish: function(effect) {
   new Effect.Scale(element, 1, { 
     scaleContent: false, 
     scaleTo: 0,
     scaleY: false,
     afterFinish: function(effect) { Element.hide(effect.element) } });
 }}, arguments[1] || {}));
}

// old: new Effect.ContentZoom(element, percent)
// new: Element.setContentZoom(element, percent) 

Element.setContentZoom = function(element, percent) {
  var element = $(element);
  element.style.fontSize = (percent/100) + "em";  
  if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
}