Dogfalo/materialize

(function ($) {

  var methods = {
  init: function (options) {
    return this.each(function() {
    var origin = $('#'+$(this).attr('data-activates'));
    var screen = $('body');

    // Creating tap target
    var tapTargetEl = $(this);
    var tapTargetWrapper = tapTargetEl.parent('.tap-target-wrapper');
    var tapTargetWave = tapTargetWrapper.find('.tap-target-wave');
    var tapTargetOriginEl = tapTargetWrapper.find('.tap-target-origin');
    var tapTargetContentEl = tapTargetEl.find('.tap-target-content');

    // Creating wrapper
    if (!tapTargetWrapper.length) {
      tapTargetWrapper = tapTargetEl.wrap($('<div class="tap-target-wrapper"></div>')).parent();
    }

    // Creating content
    if (!tapTargetContentEl.length) {
      tapTargetContentEl = $('<div class="tap-target-content"></div>');
      tapTargetEl.append(tapTargetContentEl);
    }

    // Creating foreground wave
    if (!tapTargetWave.length) {
      tapTargetWave = $('<div class="tap-target-wave"></div>');

      // Creating origin
      if (!tapTargetOriginEl.length) {
        tapTargetOriginEl = origin.clone(true, true);
        tapTargetOriginEl.addClass('tap-target-origin');
        tapTargetOriginEl.removeAttr('id');
        tapTargetOriginEl.removeAttr('style');
        tapTargetWave.append(tapTargetOriginEl);
      }

      tapTargetWrapper.append(tapTargetWave);
    }

    // Open
    var openTapTarget = function() {
      if (tapTargetWrapper.is('.open')) {
        return;
      }

      // Adding open class
      tapTargetWrapper.addClass('open');

      setTimeout(function() {
        tapTargetOriginEl.off('click.tapTarget').on('click.tapTarget', function(e) {
          closeTapTarget();
          tapTargetOriginEl.off('click.tapTarget');
        });

        $(document).off('click.tapTarget').on('click.tapTarget', function(e) {
          closeTapTarget();
          $(document).off('click.tapTarget');
        });

        var throttledCalc = Materialize.throttle(function() {
          calculateTapTarget();
        }, 200);
        $(window).off('resize.tapTarget').on('resize.tapTarget', throttledCalc);
      }, 0);
    };

    // Close
    var closeTapTarget = function(){
      if (!tapTargetWrapper.is('.open')) {
        return;
      }

      tapTargetWrapper.removeClass('open');
      tapTargetOriginEl.off('click.tapTarget')
      $(document).off('click.tapTarget');
      $(window).off('resize.tapTarget');
    };

    // Pre calculate
    var calculateTapTarget = function() {
      // Element or parent is fixed position?
      var isFixed = origin.css('position') === 'fixed';
      if (!isFixed) {
        var parents = origin.parents();
        for(var i = 0; i < parents.length; i++) {
          isFixed = $(parents[i]).css('position') == 'fixed';
          if (isFixed) {
            break;
          }
        }
      }

      // Calculating origin
      var originWidth = origin.outerWidth();
      var originHeight = origin.outerHeight();
      var originTop = isFixed ? origin.offset().top - $(document).scrollTop() : origin.offset().top;
      var originLeft = isFixed ? origin.offset().left - $(document).scrollLeft() : origin.offset().left;

      // Calculating screen
      var windowWidth = $(window).width();
      var windowHeight = $(window).height();
      var centerX = windowWidth / 2;
      var centerY = windowHeight / 2;
      var isLeft = originLeft <= centerX;
      var isRight = originLeft > centerX;
      var isTop = originTop <= centerY;
      var isBottom = originTop > centerY;
      var isCenterX = originLeft >= windowWidth*0.25 && originLeft <= windowWidth*0.75;
      var isCenterY = originTop >= windowHeight*0.25 && originTop <= windowHeight*0.75;

      // Calculating tap target
      var tapTargetWidth = tapTargetEl.outerWidth();
      var tapTargetHeight = tapTargetEl.outerHeight();
      var tapTargetTop = originTop + originHeight/2 - tapTargetHeight/2;
      var tapTargetLeft = originLeft + originWidth/2 - tapTargetWidth/2;
      var tapTargetPosition = isFixed ? 'fixed' : 'absolute';

      // Calculating content
      var tapTargetTextWidth = isCenterX ? tapTargetWidth : tapTargetWidth/2 + originWidth;
      var tapTargetTextHeight = tapTargetHeight/2;
      var tapTargetTextTop = isTop ? tapTargetHeight/2 : 0;
      var tapTargetTextBottom = 0;
      var tapTargetTextLeft = isLeft && !isCenterX ? tapTargetWidth/2 - originWidth : 0;
      var tapTargetTextRight = 0;
      var tapTargetTextPadding = originWidth;
      var tapTargetTextAlign = isBottom ? 'bottom' : 'top';

      // Calculating wave
      var tapTargetWaveWidth = originWidth > originHeight ? originWidth*2 : originWidth*2;
      var tapTargetWaveHeight = tapTargetWaveWidth;
      var tapTargetWaveTop = tapTargetHeight/2 - tapTargetWaveHeight/2;
      var tapTargetWaveLeft = tapTargetWidth/2 - tapTargetWaveWidth/2;

      // Setting tap target
      var tapTargetWrapperCssObj = {};
      tapTargetWrapperCssObj.top = isTop ? tapTargetTop : '';
      tapTargetWrapperCssObj.right = isRight ? windowWidth - tapTargetLeft - tapTargetWidth : '';
      tapTargetWrapperCssObj.bottom = isBottom ? windowHeight - tapTargetTop - tapTargetHeight : '';
      tapTargetWrapperCssObj.left = isLeft ? tapTargetLeft : '';
      tapTargetWrapperCssObj.position = tapTargetPosition;
      tapTargetWrapper.css(tapTargetWrapperCssObj);

      // Setting content
      tapTargetContentEl.css({
        width: tapTargetTextWidth,
        height: tapTargetTextHeight,
        top: tapTargetTextTop,
        right: tapTargetTextRight,
        bottom: tapTargetTextBottom,
        left: tapTargetTextLeft,
        padding: tapTargetTextPadding,
        verticalAlign: tapTargetTextAlign
      });

      // Setting wave
      tapTargetWave.css({
        top: tapTargetWaveTop,
        left: tapTargetWaveLeft,
        width: tapTargetWaveWidth,
        height: tapTargetWaveHeight
      });
    }

    if (options == 'open') {
      calculateTapTarget();
      openTapTarget();
    }

    if (options == 'close')
      closeTapTarget();
    });
  },
  open: function() {},
  close: function() {}
  };

  $.fn.tapTarget = function(methodOrOptions) {
  if (methods[methodOrOptions] || typeof methodOrOptions === 'object')
    return methods.init.apply( this, arguments );

  $.error( 'Method ' +  methodOrOptions + ' does not exist on jQuery.tap-target' );
  };

}( jQuery ));