1 | define(["dojo/_base/lang", "dojo/_base/declare", "dojo/_base/event", "dojo/sniff", |
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2 | "./ChartAction", "../Element", "dojo/touch", "../plot2d/common", "dojo/has!dojo-bidi?../bidi/action2d/ZoomAndPan"], |
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3 | function(lang, declare, eventUtil, has, ChartAction, Element, touch, common, BidiTouchZoomAndPan){ |
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4 | var GlassView = declare(Element, { |
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5 | // summary: |
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6 | // Private internal class used by TouchZoomAndPan actions. |
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7 | // tags: |
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8 | // private |
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9 | constructor: function(chart){ |
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10 | }, |
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11 | render: function(){ |
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12 | if(!this.isDirty()){ |
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13 | return; |
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14 | } |
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15 | this.cleanGroup(); |
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16 | this.group.createRect({width: this.chart.dim.width, height: this.chart.dim.height}).setFill("rgba(0,0,0,0)"); |
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17 | }, |
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18 | clear: function(){ |
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19 | // summary: |
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20 | // Clear out any parameters set on this plot. |
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21 | // returns: GlassView |
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22 | // The reference to this plot for functional chaining. |
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23 | this.dirty = true; |
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24 | // glass view needs to be above |
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25 | if(this.chart.stack[0] != this){ |
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26 | this.chart.movePlotToFront(this.name); |
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27 | } |
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28 | return this; // GlassView |
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29 | }, |
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30 | getSeriesStats: function(){ |
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31 | // summary: |
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32 | // Returns default stats (irrelevant for this type of plot). |
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33 | // returns: Object |
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34 | // {hmin, hmax, vmin, vmax} min/max in both directions. |
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35 | return lang.delegate(common.defaultStats); |
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36 | }, |
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37 | initializeScalers: function(){ |
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38 | // summary: |
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39 | // Does nothing (irrelevant for this type of plot). |
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40 | return this; |
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41 | }, |
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42 | isDirty: function(){ |
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43 | // summary: |
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44 | // Return whether or not this plot needs to be redrawn. |
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45 | // returns: Boolean |
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46 | // If this plot needs to be rendered, this will return true. |
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47 | return this.dirty; |
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48 | } |
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49 | }); |
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50 | |
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51 | /*===== |
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52 | var __TouchZoomAndPanCtorArgs = { |
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53 | // summary: |
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54 | // Additional arguments for touch zoom and pan actions. |
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55 | // axis: String? |
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56 | // Target axis name for this action. Default is "x". |
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57 | // scaleFactor: Number? |
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58 | // The scale factor applied on mouse wheel zoom. Default is 1.2. |
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59 | // maxScale: Number? |
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60 | // The max scale factor accepted by this chart action. Default is 100. |
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61 | // enableScroll: Boolean? |
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62 | // Whether touch drag gesture should scroll the chart. Default is true. |
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63 | // enableZoom: Boolean? |
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64 | // Whether touch pinch and spread gesture should zoom out or in the chart. Default is true. |
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65 | }; |
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66 | =====*/ |
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67 | |
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68 | var TouchZoomAndPan = declare(has("dojo-bidi")? "dojox.charting.action2d.NonBidiTouchZoomAndPan" : "dojox.charting.action2d.TouchZoomAndPan", ChartAction, { |
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69 | // summary: |
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70 | // Create a touch zoom and pan action. |
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71 | // You can zoom out or in the data window with pinch and spread gestures except on Android 2.x and WP8 devices. |
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72 | // You can scroll using drag gesture. |
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73 | // Finally this is possible to navigate between a fit window and a zoom one using double tap gesture. |
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74 | |
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75 | // the data description block for the widget parser |
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76 | defaultParams: { |
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77 | axis: "x", |
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78 | scaleFactor: 1.2, |
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79 | maxScale: 100, |
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80 | enableScroll: true, |
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81 | enableZoom: true |
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82 | }, |
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83 | optionalParams: {}, // no optional parameters |
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84 | |
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85 | constructor: function(chart, plot, kwArgs){ |
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86 | // summary: |
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87 | // Create a new touch zoom and pan action and connect it. |
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88 | // chart: dojox/charting/Chart |
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89 | // The chart this action applies to. |
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90 | // kwArgs: __TouchZoomAndPanCtorArgs? |
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91 | // Optional arguments for the action. |
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92 | this._listeners = [ |
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93 | {eventName: touch.press, methodName: "onTouchStart"}, |
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94 | {eventName: touch.move, methodName: "onTouchMove"}, |
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95 | {eventName: touch.release, methodName: "onTouchEnd"} |
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96 | ]; |
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97 | if(!kwArgs){ kwArgs = {}; } |
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98 | this.axis = kwArgs.axis ? kwArgs.axis : "x"; |
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99 | this.scaleFactor = kwArgs.scaleFactor ? kwArgs.scaleFactor : 1.2; |
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100 | this.maxScale = kwArgs.maxScale ? kwArgs.maxScale : 100; |
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101 | this.enableScroll = kwArgs.enableScroll != undefined ? kwArgs.enableScroll : true; |
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102 | this.enableZoom = kwArgs.enableScroll != undefined ? kwArgs.enableZoom : true; |
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103 | this._uName = "touchZoomPan"+this.axis; |
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104 | this.connect(); |
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105 | }, |
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106 | |
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107 | connect: function(){ |
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108 | // summary: |
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109 | // Connect this action to the chart. On iOS this adds a new glass view plot |
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110 | // to the chart that's why Chart.render() must be called after connect. |
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111 | this.inherited(arguments); |
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112 | // this is needed to workaround issue on iOS Safari + SVG, because a touch start action |
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113 | // started above a item that is removed during the touch action will stop |
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114 | // dispatching touch events! |
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115 | if(this.chart.surface.declaredClass.indexOf("svg")!=-1){ |
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116 | this.chart.addPlot(this._uName, {type: GlassView}); |
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117 | } |
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118 | }, |
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119 | |
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120 | disconnect: function(){ |
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121 | // summary: |
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122 | // Disconnect this action from the chart. |
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123 | if(this.chart.surface.declaredClass.indexOf("svg")!=-1){ |
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124 | this.chart.removePlot(this._uName); |
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125 | } |
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126 | this.inherited(arguments); |
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127 | }, |
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128 | |
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129 | onTouchStart: function(event){ |
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130 | // summary: |
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131 | // Called when touch is started on the chart. |
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132 | |
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133 | // we always want to be above regular plots and not clipped |
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134 | var chart = this.chart, axis = chart.getAxis(this.axis); |
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135 | var length = event.touches ? event.touches.length : 1; |
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136 | var coord = event.touches ? event.touches[0] : event; |
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137 | // in case we have a double tap register previous coord |
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138 | var prevPageCoord = this._startPageCoord; |
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139 | this._startPageCoord = {x: coord.pageX, y: coord.pageY}; |
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140 | if((this.enableZoom || this.enableScroll) && chart._delayedRenderHandle){ |
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141 | // we have pending rendering from a scroll, let's sync |
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142 | chart.render(); |
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143 | } |
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144 | if(this.enableZoom && length >= 2){ |
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145 | // we reset double tap |
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146 | this._startTime = 0; |
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147 | this._endPageCoord = {x: event.touches[1].pageX, y: event.touches[1].pageY}; |
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148 | var middlePageCoord = {x: (this._startPageCoord.x + this._endPageCoord.x) / 2, |
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149 | y: (this._startPageCoord.y + this._endPageCoord.y) / 2}; |
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150 | var scaler = axis.getScaler(); |
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151 | this._initScale = axis.getWindowScale(); |
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152 | var t = this._initData = this.plot.toData(); |
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153 | this._middleCoord = t(middlePageCoord)[this.axis]; |
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154 | this._startCoord = scaler.bounds.from; |
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155 | this._endCoord = scaler.bounds.to; |
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156 | }else{ |
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157 | // double tap is only for single touch |
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158 | if(!event.touches || event.touches.length == 1){ |
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159 | if(!this._startTime){ |
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160 | this._startTime = new Date().getTime(); |
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161 | }else if((new Date().getTime() - this._startTime) < 250 && |
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162 | Math.abs(this._startPageCoord.x - prevPageCoord.x) < 30 && |
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163 | Math.abs(this._startPageCoord.y - prevPageCoord.y) < 30){ |
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164 | this._startTime = 0; |
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165 | this.onDoubleTap(event); |
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166 | }else{ |
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167 | // we missed the doubletap, we need to re-init for next time |
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168 | this._startTime = 0; |
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169 | } |
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170 | }else{ |
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171 | // we missed the doubletap, we need to re-init for next time |
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172 | this._startTime = 0; |
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173 | } |
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174 | if(this.enableScroll){ |
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175 | this._startScroll(axis); |
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176 | // needed for Android, otherwise will get a touch cancel while swiping |
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177 | eventUtil.stop(event); |
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178 | } |
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179 | } |
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180 | }, |
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181 | |
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182 | onTouchMove: function(event){ |
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183 | // summary: |
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184 | // Called when touch is moved on the chart. |
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185 | var chart = this.chart, axis = chart.getAxis(this.axis); |
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186 | var length = event.touches ? event.touches.length : 1; |
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187 | var pAttr = axis.vertical?"pageY":"pageX", |
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188 | attr = axis.vertical?"y":"x"; |
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189 | // any move action cancel double tap |
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190 | this._startTime = 0; |
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191 | if(this.enableZoom && length >= 2){ |
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192 | var newMiddlePageCoord = {x: (event.touches[1].pageX + event.touches[0].pageX) / 2, |
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193 | y: (event.touches[1].pageY + event.touches[0].pageY) / 2}; |
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194 | var scale = (this._endPageCoord[attr] - this._startPageCoord[attr]) / |
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195 | (event.touches[1][pAttr] - event.touches[0][pAttr]); |
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196 | |
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197 | if(this._initScale / scale > this.maxScale){ |
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198 | return; |
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199 | } |
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200 | |
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201 | var newMiddleCoord = this._initData(newMiddlePageCoord)[this.axis]; |
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202 | |
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203 | var newStart = scale * (this._startCoord - newMiddleCoord) + this._middleCoord, |
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204 | newEnd = scale * (this._endCoord - newMiddleCoord) + this._middleCoord; |
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205 | chart.zoomIn(this.axis, [newStart, newEnd]); |
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206 | // avoid browser pan |
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207 | eventUtil.stop(event); |
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208 | }else if(this.enableScroll){ |
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209 | var delta = this._getDelta(event); |
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210 | chart.setAxisWindow(this.axis, this._lastScale, this._initOffset - delta / this._lastFactor / this._lastScale); |
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211 | chart.delayedRender(); |
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212 | // avoid browser pan |
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213 | eventUtil.stop(event); |
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214 | } |
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215 | }, |
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216 | |
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217 | onTouchEnd: function(event){ |
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218 | // summary: |
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219 | // Called when touch is ended on the chart. |
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220 | var chart = this.chart, axis = chart.getAxis(this.axis); |
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221 | if((!event.touches || event.touches.length == 1) && this.enableScroll){ |
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222 | // still one touch available, let's start back from here for |
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223 | // potential pan |
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224 | var coord = event.touches ? event.touches[0] : event; |
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225 | this._startPageCoord = {x: coord.pageX, y: coord.pageY}; |
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226 | this._startScroll(axis); |
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227 | } |
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228 | }, |
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229 | |
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230 | _startScroll: function(axis){ |
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231 | var bounds = axis.getScaler().bounds; |
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232 | this._initOffset = axis.getWindowOffset(); |
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233 | // we keep it because of delay rendering we might now always have access to the |
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234 | // information to compute it |
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235 | this._lastScale = axis.getWindowScale(); |
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236 | this._lastFactor = bounds.span / (bounds.upper - bounds.lower); |
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237 | }, |
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238 | |
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239 | onDoubleTap: function(event){ |
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240 | // summary: |
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241 | // Called when double tap is performed on the chart. |
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242 | var chart = this.chart, axis = chart.getAxis(this.axis); |
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243 | var scale = 1 / this.scaleFactor; |
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244 | // are we fit? |
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245 | if(axis.getWindowScale()==1){ |
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246 | // fit => zoom |
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247 | var scaler = axis.getScaler(), start = scaler.bounds.from, end = scaler.bounds.to, |
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248 | oldMiddle = (start + end) / 2, newMiddle = this.plot.toData(this._startPageCoord)[this.axis], |
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249 | newStart = scale * (start - oldMiddle) + newMiddle, newEnd = scale * (end - oldMiddle) + newMiddle; |
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250 | chart.zoomIn(this.axis, [newStart, newEnd]); |
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251 | }else{ |
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252 | // non fit => fit |
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253 | chart.setAxisWindow(this.axis, 1, 0); |
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254 | chart.render(); |
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255 | } |
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256 | eventUtil.stop(event); |
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257 | }, |
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258 | |
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259 | _getDelta: function(event){ |
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260 | var axis = this.chart.getAxis(this.axis), |
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261 | pAttr = axis.vertical?"pageY":"pageX", |
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262 | attr = axis.vertical?"y":"x"; |
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263 | var coord = event.touches?event.touches[0]:event; |
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264 | return axis.vertical?(this._startPageCoord[attr] - coord[pAttr]): |
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265 | (coord[pAttr] - this._startPageCoord[attr]); |
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266 | } |
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267 | }); |
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268 | return has("dojo-bidi")? declare("dojox.charting.action2d.TouchZoomAndPan", [TouchZoomAndPan, BidiTouchZoomAndPan]) : TouchZoomAndPan; |
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269 | }); |
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