includes/clientside/static/flyin.js
author Dan
Sat, 25 Aug 2007 12:11:31 -0400
changeset 98 6457a9b983c6
parent 81 d7fc25acd3f3
child 420 301f546688d1
permissions -rw-r--r--
Fixed non-object reference in databaseless template, added locking for Javascript paginator, made comments on AES key size more clear in constants, and disallowed "anonymous" and IP addresses for admin username in install.php; Loch Ness release candidate

// Make an HTML element fly in from the top or bottom.
// Includes inertia!

// vB, don't even try. It's GPL like the rest of Enano. I know you're jealous. >:)

var fly_in_cache = new Object();
var FI_TOP = 1;
var FI_BOTTOM = 2;
var FI_IN = 1;
var FI_OUT = 2;
var FI_UP = 1;
var FI_DOWN = 2;

/**
 * You can thank Robert Penner for the math used here. Ported from an ActionScript class.
 * License: Modified BSD license <http://www.robertpenner.com/easing_terms_of_use.html>
 */

// Effects code - don't bother changing these formulas
var Back = {
  easeOut: function(t, b, c, d, s)
  {
    if (s == undefined) s = 1.70158;
    return c * ( ( t=t/d-1 ) * t * ( ( s + 1 ) * t + s) + 1) + b;
  },
  easeIn: function (t, b, c, d, s)
  {
    if (s == undefined) s = 1.70158;
    return c * ( t/=d ) * t * ( ( s + 1 ) * t - s) + b;
  },
  easeInOut: function (t, b, c, d, s)
  {
    if (s == undefined) s = 1.70158; 
    if ((t /= d/2) < 1) 
    {
      return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
    }
    return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
  }
}

// This should be set to the class name of the effect you want.
var GlideEffect = Back;

// Placeholder functions, to make organization a little easier :-)

function fly_in_top(element, nofade, height_taken_care_of)
{
  return fly_core(element, nofade, FI_TOP, FI_IN, height_taken_care_of);
}

function fly_in_bottom(element, nofade, height_taken_care_of)
{
  return fly_core(element, nofade, FI_BOTTOM, FI_IN, height_taken_care_of);
}

function fly_out_top(element, nofade, height_taken_care_of)
{
  return fly_core(element, nofade, FI_TOP, FI_OUT, height_taken_care_of);
}

function fly_out_bottom(element, nofade, height_taken_care_of)
{
  return fly_core(element, nofade, FI_BOTTOM, FI_OUT, height_taken_care_of);
}

function fly_core(element, nofade, origin, direction, height_taken_care_of)
{
  if ( !element || typeof(element) != 'object' )
    return false;
  // target dimensions
  var top, left;
  // initial dimensions
  var topi, lefti;
  // current dimensions
  var topc, leftc;
  // screen dimensions
  var w = getWidth();
  var h = getHeight();
  var y = parseInt ( getScrollOffset() );
  // temp vars
  var dim, off, diff, dist, ratio, opac_factor;
  // setup element
  element.style.position = 'absolute';
  
  dim = [ $(element).Height(), $(element).Width() ];
  off = [ $(element).Top(), $(element).Left() ];
  
  if ( height_taken_care_of )
  {
    top = off[0];
    left = off[1];
  }
  else
  {
    top  = Math.round(( h / 2 ) - ( dim[0] / 2 )) + y; // - ( h / 4 ));
    left = Math.round(( w / 2 ) - ( dim[1] / 2 ));
  }
  
  // you can change this around to get it to fly in from corners or be on the left/right side
  lefti = left;
  
  // calculate first frame Y position
  if ( origin == FI_TOP && direction == FI_IN )
  {
    topi = 0 - dim[0] + y;
  }
  else if ( origin == FI_TOP && direction == FI_OUT )
  {
    topi = top;
    top = 0 - dim[0] + y;
  }
  else if ( origin == FI_BOTTOM && direction == FI_IN )
  {
    topi = h + y;
  }
  else if ( origin == FI_BOTTOM && direction == FI_OUT )
  {
    topi = top;
    top = h + y;
  }
  
  var abs_dir = ( ( origin == FI_TOP && direction == FI_IN ) || ( origin == FI_BOTTOM && direction == FI_OUT ) ) ? FI_DOWN : FI_UP;
  
  var diff_top = top - topi;
  var diff_left = left - lefti;
  
  var frames = 100;
  var timeout = 0;
  var timerstep = 8;
  
  // cache element so it can be changed from within setTimeout()
  var rand_seed = Math.floor(Math.random() * 1000000);
  fly_in_cache[rand_seed] = element;
  
  for ( var i = 0; i < frames; i++ )
  {
    topc = GlideEffect.easeInOut(i, topi, diff_top, frames);
    leftc = GlideEffect.easeInOut(i, lefti, diff_left, frames);
    var code = 'var o = fly_in_cache['+rand_seed+']; o.style.top=\''+topc+'px\';';
    if ( !height_taken_care_of )
      code += ' o.style.left=\''+leftc+'px\'';
    code += ';';
    setTimeout(code, timeout);
    timeout += timerstep;
    
    var ratio = i / frames;
    
    if ( !nofade )
    {
      // handle fade
      var opac_factor = ratio * 100;
      if ( direction == FI_OUT )
        opac_factor = 100 - opac_factor;
      setTimeout('var o = fly_in_cache['+rand_seed+']; domObjChangeOpac('+opac_factor+', o);', timeout);
    }
    
  }
  
  // old framestepper code removed from here in Loch Ness
  
  timeout += timerstep;
  return timeout;
}

function abs(i)
{
  if ( isNaN(i) )
    return i;
  return ( i < 0 ) ? ( 0 - i ) : i;
}