1 | /*!* |
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2 | * |
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3 | * Add support for scaling using jQTouch |
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4 | * |
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5 | * Copyright (c) 2009 Sam Shull <http://www.google.com/profiles/brickysam26> |
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6 | * Released under MIT license |
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7 | * |
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8 | * <code> |
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9 | * |
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10 | * <div> |
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11 | * <img src="http://rlv.zcache.com/css_is_awesome_mug-p1687164350719819282objs_210.jpg" alt="CSS Is Awesome" class="scalable"/> |
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12 | * </div> |
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13 | * |
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14 | * </code> |
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15 | * |
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16 | * Known issues: |
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17 | * - using a link that is a slideSelector (ie: body > * > ul li a) on the same psuedo-page causes problems during scaling |
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18 | * |
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19 | * |
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20 | * |
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21 | */ |
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22 | |
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23 | (function($) |
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24 | { |
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25 | |
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26 | $.fn.scalable = function (options) |
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27 | { |
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28 | return this.each(function () |
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29 | { |
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30 | new iScale( this, options ); |
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31 | }); |
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32 | }; |
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33 | |
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34 | if ($.jQTouch) |
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35 | { |
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36 | $.jQTouch.addExtension(function (jQT){ |
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37 | |
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38 | function binder (e, info) |
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39 | { |
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40 | info.page.find('.scalable').scalable(); |
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41 | } |
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42 | |
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43 | $(document.body) |
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44 | .bind('pageInserted', binder); |
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45 | |
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46 | $(function() |
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47 | { |
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48 | $('body > *') |
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49 | .each(function() |
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50 | { |
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51 | binder({}, {page: $(this)}); |
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52 | }); |
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53 | }); |
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54 | |
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55 | return {}; |
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56 | }); |
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57 | |
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58 | |
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59 | function iScale (el, options) |
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60 | { |
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61 | var that = this; |
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62 | |
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63 | this.numberOfTouches = 2; |
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64 | |
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65 | this.element = el; |
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66 | this.scale(1); |
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67 | this.refresh(); |
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68 | |
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69 | this.scaleLessThanOne = false; |
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70 | |
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71 | el.style.webkitTransitionTimingFunction = 'cubic-bezier(0, 0, 0.2, 1)'; |
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72 | |
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73 | el.addEventListener('touchstart', this, false); |
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74 | //moved up here because I didnt see any reason to add and remove them |
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75 | el.addEventListener('touchmove', this, false); |
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76 | el.addEventListener('touchend', this, false); |
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77 | |
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78 | window.addEventListener('unload', function () |
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79 | { |
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80 | el.removeEventListener('touchstart', that, false); |
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81 | el.removeEventListener('touchmove', that, false); |
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82 | el.removeEventListener('touchend', that, false); |
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83 | |
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84 | this.removeEventListener('unload', arguments.callee, false); |
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85 | }, false); |
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86 | |
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87 | if (options) |
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88 | { |
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89 | $.extend(this, options); |
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90 | } |
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91 | } |
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92 | |
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93 | iScale.prototype = { |
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94 | handleEvent: function(e) { |
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95 | switch(e.type) { |
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96 | case 'touchstart': return this.onTouchStart(e); break; |
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97 | case 'touchmove': return this.onTouchMove(e); break; |
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98 | case 'touchend': return this.onTouchEnd(e); break; |
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99 | } |
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100 | }, |
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101 | |
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102 | scale: function (scale) { |
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103 | if (scale !== undefined) |
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104 | { |
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105 | this._scale = scale; |
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106 | this.element.style.webkitTransform = 'scale('+scale+')'; |
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107 | return; |
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108 | } |
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109 | |
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110 | return this._scale; |
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111 | }, |
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112 | |
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113 | refresh: function() { |
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114 | this.element.style.webkitTransitionDuration = '0'; |
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115 | }, |
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116 | |
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117 | onTouchStart: function(e) { |
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118 | if ( e.targetTouches.length != this.numberOfTouches ) |
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119 | { |
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120 | return; |
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121 | } |
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122 | |
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123 | this.refresh(); |
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124 | |
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125 | this.moved = false; |
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126 | |
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127 | this.startDistance = Math.sqrt( |
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128 | Math.pow((e.targetTouches[1].clientX - e.targetTouches[0].clientX), 2) |
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129 | + Math.pow((e.targetTouches[1].clientX - e.targetTouches[0].clientX), 2) |
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130 | ); |
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131 | |
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132 | return false; |
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133 | }, |
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134 | |
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135 | onTouchMove: function(e) { |
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136 | if( e.targetTouches.length != this.numberOfTouches ) |
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137 | return; |
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138 | |
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139 | e.preventDefault(); |
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140 | |
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141 | this.moved = true; |
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142 | |
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143 | this.refresh(); |
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144 | |
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145 | var newDistance = Math.sqrt( |
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146 | Math.pow((e.targetTouches[1].clientX - e.targetTouches[0].clientX), 2) |
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147 | + Math.pow((e.targetTouches[1].clientY - e.targetTouches[0].clientY), 2) |
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148 | ), |
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149 | difference = newDistance - this.startDistance, |
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150 | percentChange = (difference / this.startDistance) / 2; |
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151 | |
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152 | this.scale(this.scale() + (this.scale() * percentChange)); |
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153 | |
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154 | this.startDistance = newDistance; |
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155 | |
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156 | return false; |
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157 | }, |
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158 | |
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159 | onTouchEnd: function(e) { |
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160 | var theTarget,theEvent; |
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161 | |
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162 | if( !this.moved ) { |
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163 | theTarget = e.target; |
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164 | if(theTarget.nodeType == 3) theTarget = theTarget.parentNode; |
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165 | theEvent = document.createEvent("MouseEvents"); |
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166 | theEvent.initEvent('click', true, true); |
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167 | theTarget.dispatchEvent(theEvent); |
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168 | return; |
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169 | } |
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170 | |
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171 | e.preventDefault(); |
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172 | e.stopPropagation(); |
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173 | |
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174 | if (!this.scaleLessThanOne && this.scale() < 1) |
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175 | { |
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176 | this.element.style.webkitTransitionDuration = '200ms'; |
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177 | this.scale(1); |
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178 | } |
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179 | |
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180 | return false; |
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181 | }, |
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182 | |
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183 | scaleTo: function(dest, runtime) { |
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184 | this.element.style.webkitTransitionDuration = runtime ? runtime : '300ms'; |
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185 | this.scale(dest ? dest : 0); |
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186 | } |
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187 | }; |
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188 | } |
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189 | })(jQuery); |
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