1 | /* |
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2 | * Ext JS Library 2.2.1 |
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3 | * Copyright(c) 2006-2009, Ext JS, LLC. |
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4 | * licensing@extjs.com |
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5 | * |
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6 | * http://extjs.com/license |
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7 | */ |
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8 | |
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9 | /** |
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10 | * @class Ext.dd.ScrollManager |
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11 | * <p>Provides automatic scrolling of overflow regions in the page during drag operations.</p> |
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12 | * <p>The ScrollManager configs will be used as the defaults for any scroll container registered with it, |
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13 | * but you can also override most of the configs per scroll container by adding a |
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14 | * <tt>ddScrollConfig</tt> object to the target element that contains these properties: {@link #hthresh}, |
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15 | * {@link #vthresh}, {@link #increment} and {@link #frequency}. Example usage: |
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16 | * <pre><code> |
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17 | var el = Ext.get('scroll-ct'); |
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18 | el.ddScrollConfig = { |
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19 | vthresh: 50, |
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20 | hthresh: -1, |
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21 | frequency: 100, |
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22 | increment: 200 |
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23 | }; |
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24 | Ext.dd.ScrollManager.register(el); |
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25 | </code></pre> |
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26 | * <b>Note: This class uses "Point Mode" and is untested in "Intersect Mode".</b> |
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27 | * @singleton |
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28 | */ |
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29 | Ext.dd.ScrollManager = function(){ |
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30 | var ddm = Ext.dd.DragDropMgr; |
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31 | var els = {}; |
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32 | var dragEl = null; |
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33 | var proc = {}; |
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34 | |
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35 | var onStop = function(e){ |
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36 | dragEl = null; |
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37 | clearProc(); |
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38 | }; |
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39 | |
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40 | var triggerRefresh = function(){ |
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41 | if(ddm.dragCurrent){ |
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42 | ddm.refreshCache(ddm.dragCurrent.groups); |
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43 | } |
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44 | }; |
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45 | |
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46 | var doScroll = function(){ |
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47 | if(ddm.dragCurrent){ |
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48 | var dds = Ext.dd.ScrollManager; |
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49 | var inc = proc.el.ddScrollConfig ? |
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50 | proc.el.ddScrollConfig.increment : dds.increment; |
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51 | if(!dds.animate){ |
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52 | if(proc.el.scroll(proc.dir, inc)){ |
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53 | triggerRefresh(); |
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54 | } |
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55 | }else{ |
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56 | proc.el.scroll(proc.dir, inc, true, dds.animDuration, triggerRefresh); |
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57 | } |
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58 | } |
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59 | }; |
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60 | |
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61 | var clearProc = function(){ |
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62 | if(proc.id){ |
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63 | clearInterval(proc.id); |
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64 | } |
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65 | proc.id = 0; |
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66 | proc.el = null; |
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67 | proc.dir = ""; |
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68 | }; |
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69 | |
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70 | var startProc = function(el, dir){ |
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71 | clearProc(); |
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72 | proc.el = el; |
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73 | proc.dir = dir; |
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74 | var freq = (el.ddScrollConfig && el.ddScrollConfig.frequency) ? |
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75 | el.ddScrollConfig.frequency : Ext.dd.ScrollManager.frequency; |
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76 | proc.id = setInterval(doScroll, freq); |
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77 | }; |
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78 | |
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79 | var onFire = function(e, isDrop){ |
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80 | if(isDrop || !ddm.dragCurrent){ return; } |
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81 | var dds = Ext.dd.ScrollManager; |
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82 | if(!dragEl || dragEl != ddm.dragCurrent){ |
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83 | dragEl = ddm.dragCurrent; |
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84 | // refresh regions on drag start |
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85 | dds.refreshCache(); |
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86 | } |
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87 | |
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88 | var xy = Ext.lib.Event.getXY(e); |
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89 | var pt = new Ext.lib.Point(xy[0], xy[1]); |
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90 | for(var id in els){ |
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91 | var el = els[id], r = el._region; |
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92 | var c = el.ddScrollConfig ? el.ddScrollConfig : dds; |
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93 | if(r && r.contains(pt) && el.isScrollable()){ |
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94 | if(r.bottom - pt.y <= c.vthresh){ |
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95 | if(proc.el != el){ |
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96 | startProc(el, "down"); |
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97 | } |
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98 | return; |
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99 | }else if(r.right - pt.x <= c.hthresh){ |
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100 | if(proc.el != el){ |
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101 | startProc(el, "left"); |
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102 | } |
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103 | return; |
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104 | }else if(pt.y - r.top <= c.vthresh){ |
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105 | if(proc.el != el){ |
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106 | startProc(el, "up"); |
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107 | } |
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108 | return; |
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109 | }else if(pt.x - r.left <= c.hthresh){ |
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110 | if(proc.el != el){ |
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111 | startProc(el, "right"); |
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112 | } |
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113 | return; |
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114 | } |
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115 | } |
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116 | } |
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117 | clearProc(); |
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118 | }; |
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119 | |
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120 | ddm.fireEvents = ddm.fireEvents.createSequence(onFire, ddm); |
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121 | ddm.stopDrag = ddm.stopDrag.createSequence(onStop, ddm); |
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122 | |
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123 | return { |
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124 | /** |
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125 | * Registers new overflow element(s) to auto scroll |
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126 | * @param {Mixed/Array} el The id of or the element to be scrolled or an array of either |
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127 | */ |
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128 | register : function(el){ |
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129 | if(Ext.isArray(el)){ |
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130 | for(var i = 0, len = el.length; i < len; i++) { |
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131 | this.register(el[i]); |
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132 | } |
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133 | }else{ |
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134 | el = Ext.get(el); |
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135 | els[el.id] = el; |
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136 | } |
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137 | }, |
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138 | |
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139 | /** |
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140 | * Unregisters overflow element(s) so they are no longer scrolled |
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141 | * @param {Mixed/Array} el The id of or the element to be removed or an array of either |
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142 | */ |
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143 | unregister : function(el){ |
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144 | if(Ext.isArray(el)){ |
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145 | for(var i = 0, len = el.length; i < len; i++) { |
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146 | this.unregister(el[i]); |
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147 | } |
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148 | }else{ |
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149 | el = Ext.get(el); |
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150 | delete els[el.id]; |
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151 | } |
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152 | }, |
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153 | |
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154 | /** |
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155 | * The number of pixels from the top or bottom edge of a container the pointer needs to be to |
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156 | * trigger scrolling (defaults to 25) |
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157 | * @type Number |
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158 | */ |
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159 | vthresh : 25, |
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160 | /** |
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161 | * The number of pixels from the right or left edge of a container the pointer needs to be to |
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162 | * trigger scrolling (defaults to 25) |
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163 | * @type Number |
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164 | */ |
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165 | hthresh : 25, |
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166 | |
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167 | /** |
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168 | * The number of pixels to scroll in each scroll increment (defaults to 50) |
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169 | * @type Number |
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170 | */ |
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171 | increment : 100, |
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172 | |
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173 | /** |
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174 | * The frequency of scrolls in milliseconds (defaults to 500) |
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175 | * @type Number |
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176 | */ |
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177 | frequency : 500, |
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178 | |
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179 | /** |
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180 | * True to animate the scroll (defaults to true) |
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181 | * @type Boolean |
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182 | */ |
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183 | animate: true, |
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184 | |
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185 | /** |
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186 | * The animation duration in seconds - |
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187 | * MUST BE less than Ext.dd.ScrollManager.frequency! (defaults to .4) |
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188 | * @type Number |
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189 | */ |
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190 | animDuration: .4, |
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191 | |
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192 | /** |
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193 | * Manually trigger a cache refresh. |
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194 | */ |
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195 | refreshCache : function(){ |
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196 | for(var id in els){ |
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197 | if(typeof els[id] == 'object'){ // for people extending the object prototype |
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198 | els[id]._region = els[id].getRegion(); |
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199 | } |
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200 | } |
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201 | } |
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202 | }; |
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203 | }(); |
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