1 | define(["dojo/_base/declare", "dojo/_base/window", "dojo/_base/array", "dojo/_base/event", |
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2 | "dojo/_base/connect", "dojo/mouse", "./ChartAction", "dojo/sniff", "dojo/dom-prop", "dojo/keys", |
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3 | "dojo/has!dojo-bidi?../bidi/action2d/ZoomAndPan"], |
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4 | function(declare, win, arr, eventUtil, connect, mouse, ChartAction, has, domProp, keys, BidiMouseZoomAndPan){ |
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5 | |
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6 | /*===== |
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7 | var __MouseZoomAndPanCtorArgs = { |
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8 | // summary: |
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9 | // Additional arguments for mouse zoom and pan actions. |
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10 | // axis: String? |
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11 | // Target axis name for this action. Default is "x". |
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12 | // scaleFactor: Number? |
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13 | // The scale factor applied on mouse wheel zoom. Default is 1.2. |
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14 | // maxScale: Number? |
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15 | // The max scale factor accepted by this chart action. Default is 100. |
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16 | // enableScroll: Boolean? |
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17 | // Whether mouse drag gesture should scroll the chart. Default is true. |
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18 | // enableDoubleClickZoom: Boolean? |
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19 | // Whether a double click gesture should toggle between fit and zoom on the chart. Default is true. |
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20 | // enableKeyZoom: Boolean? |
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21 | // Whether a keyZoomModifier + + or keyZoomModifier + - key press should zoom in our out on the chart. Default is true. |
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22 | // keyZoomModifier: String? |
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23 | // Which keyboard modifier should used for keyboard zoom in and out. This should be one of "alt", "ctrl", "shift" or "none" for no modifier. Default is "ctrl". |
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24 | }; |
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25 | =====*/ |
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26 | |
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27 | var sUnit = has("mozilla") ? 3 : 120; |
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28 | var keyTests = { |
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29 | none: function(event){ |
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30 | return !event.ctrlKey && !event.altKey && !event.shiftKey; |
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31 | }, |
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32 | ctrl: function(event){ |
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33 | return event.ctrlKey && !event.altKey && !event.shiftKey; |
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34 | }, |
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35 | alt: function(event){ |
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36 | return !event.ctrlKey && event.altKey && !event.shiftKey; |
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37 | }, |
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38 | shift: function(event){ |
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39 | return !event.ctrlKey && !event.altKey && event.shiftKey; |
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40 | } |
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41 | }; |
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42 | |
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43 | var MouseZoomAndPan = declare(has("dojo-bidi")? "dojox.charting.action2d.NonBidiMouseZoomAndPan" : "dojox.charting.action2d.MouseZoomAndPan", ChartAction, { |
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44 | // summary: |
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45 | // Create an mouse zoom and pan action. |
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46 | // You can zoom in or out the data window with mouse wheel. You can scroll using mouse drag gesture. |
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47 | // You can toggle between zoom and fit view using double click on the chart. |
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48 | |
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49 | // the data description block for the widget parser |
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50 | defaultParams: { |
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51 | axis: "x", |
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52 | scaleFactor: 1.2, |
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53 | maxScale: 100, |
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54 | enableScroll: true, |
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55 | enableDoubleClickZoom: true, |
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56 | enableKeyZoom: true, |
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57 | keyZoomModifier: "ctrl" |
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58 | }, |
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59 | optionalParams: {}, // no optional parameters |
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60 | |
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61 | constructor: function(chart, plot, kwArgs){ |
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62 | // summary: |
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63 | // Create an mouse zoom and pan action and connect it. |
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64 | // chart: dojox/charting/Chart |
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65 | // The chart this action applies to. |
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66 | // kwArgs: __MouseZoomAndPanCtorArgs? |
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67 | // Optional arguments for the chart action. |
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68 | this._listeners = [{eventName: mouse.wheel, methodName: "onMouseWheel"}]; |
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69 | if(!kwArgs){ kwArgs = {}; } |
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70 | this.axis = kwArgs.axis ? kwArgs.axis : "x"; |
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71 | this.scaleFactor = kwArgs.scaleFactor ? kwArgs.scaleFactor : 1.2; |
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72 | this.maxScale = kwArgs.maxScale ? kwArgs.maxScale : 100; |
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73 | this.enableScroll = kwArgs.enableScroll != undefined ? kwArgs.enableScroll : true; |
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74 | this.enableDoubleClickZoom = kwArgs.enableDoubleClickZoom != undefined ? kwArgs.enableDoubleClickZoom : true; |
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75 | this.enableKeyZoom = kwArgs.enableKeyZoom != undefined ? kwArgs.enableKeyZoom : true; |
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76 | this.keyZoomModifier = kwArgs.keyZoomModifier ? kwArgs.keyZoomModifier : "ctrl"; |
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77 | if(this.enableScroll){ |
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78 | this._listeners.push({eventName: "onmousedown", methodName: "onMouseDown"}); |
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79 | } |
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80 | if(this.enableDoubleClickZoom){ |
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81 | this._listeners.push({eventName: "ondblclick", methodName: "onDoubleClick"}); |
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82 | } |
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83 | if(this.enableKeyZoom){ |
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84 | this._listeners.push({eventName: "keypress", methodName: "onKeyPress"}); |
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85 | } |
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86 | this._handles = []; |
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87 | this.connect(); |
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88 | }, |
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89 | |
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90 | _disconnectHandles: function(){ |
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91 | if(has("ie")){ |
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92 | this.chart.node.releaseCapture(); |
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93 | } |
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94 | arr.forEach(this._handles, connect.disconnect); |
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95 | this._handles = []; |
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96 | }, |
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97 | |
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98 | connect: function(){ |
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99 | // summary: |
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100 | // Connect this action to the chart. |
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101 | this.inherited(arguments); |
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102 | if(this.enableKeyZoom){ |
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103 | // we want to be able to get focus to receive key events |
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104 | domProp.set(this.chart.node, "tabindex", "0"); |
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105 | // if one doesn't want a focus border he can do something like |
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106 | // dojo.style(this.chart.node, "outline", "none"); |
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107 | } |
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108 | }, |
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109 | |
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110 | disconnect: function(){ |
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111 | // summary: |
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112 | // Disconnect this action from the chart. |
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113 | this.inherited(arguments); |
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114 | if(this.enableKeyZoom){ |
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115 | // we don't need anymore to be able to get focus to receive key events |
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116 | domProp.set(this.chart.node, "tabindex", "-1"); |
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117 | } |
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118 | // in case we disconnect before the end of the action |
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119 | this._disconnectHandles(); |
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120 | }, |
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121 | |
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122 | onMouseDown: function(event){ |
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123 | // summary: |
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124 | // Called when mouse is down on the chart. |
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125 | var chart = this.chart, axis = chart.getAxis(this.axis); |
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126 | if(!axis.vertical){ |
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127 | this._startCoord = event.pageX; |
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128 | }else{ |
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129 | this._startCoord = event.pageY; |
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130 | } |
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131 | this._startOffset = axis.getWindowOffset(); |
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132 | this._isPanning = true; |
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133 | // we now want to capture mouse move events everywhere to avoid |
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134 | // stop scrolling when going out of the chart window |
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135 | if(has("ie")){ |
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136 | this._handles.push(connect.connect(this.chart.node, "onmousemove", this, "onMouseMove")); |
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137 | this._handles.push(connect.connect(this.chart.node, "onmouseup", this, "onMouseUp")); |
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138 | this.chart.node.setCapture(); |
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139 | }else{ |
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140 | this._handles.push(connect.connect(win.doc, "onmousemove", this, "onMouseMove")); |
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141 | this._handles.push(connect.connect(win.doc, "onmouseup", this, "onMouseUp")); |
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142 | } |
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143 | chart.node.focus(); |
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144 | // prevent the browser from trying the drag on the "image" |
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145 | eventUtil.stop(event); |
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146 | }, |
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147 | |
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148 | onMouseMove: function(event){ |
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149 | // summary: |
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150 | // Called when mouse is moved on the chart. |
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151 | if(this._isPanning){ |
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152 | var chart = this.chart, axis = chart.getAxis(this.axis); |
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153 | var delta = this._getDelta(event); |
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154 | |
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155 | var bounds = axis.getScaler().bounds, |
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156 | s = bounds.span / (bounds.upper - bounds.lower); |
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157 | |
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158 | var scale = axis.getWindowScale(); |
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159 | chart.setAxisWindow(this.axis, scale, this._startOffset - delta / s / scale); |
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160 | chart.render(); |
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161 | } |
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162 | }, |
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163 | |
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164 | onMouseUp: function(event){ |
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165 | // summary: |
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166 | // Called when mouse is up on the chart. |
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167 | this._isPanning = false; |
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168 | this._disconnectHandles(); |
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169 | }, |
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170 | |
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171 | onMouseWheel: function(event){ |
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172 | // summary: |
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173 | // Called when mouse wheel is used on the chart. |
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174 | var scroll = event.wheelDelta / sUnit; |
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175 | // on Mozilla the sUnit might actually not always be 3 |
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176 | // make sure we never have -1 < scroll < 1 |
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177 | if(scroll > -1 && scroll < 0){ |
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178 | scroll = -1; |
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179 | }else if(scroll > 0 && scroll < 1){ |
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180 | scroll = 1; |
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181 | } |
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182 | this._onZoom(scroll, event); |
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183 | }, |
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184 | |
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185 | onKeyPress: function(event){ |
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186 | // summary: |
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187 | // Called when a key is pressed on the chart. |
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188 | if(keyTests[this.keyZoomModifier](event)){ |
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189 | if(event.keyChar == "+" || event.keyCode == keys.NUMPAD_PLUS){ |
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190 | this._onZoom(1, event); |
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191 | }else if(event.keyChar == "-" || event.keyCode == keys.NUMPAD_MINUS){ |
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192 | this._onZoom(-1, event); |
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193 | } |
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194 | } |
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195 | }, |
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196 | |
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197 | onDoubleClick: function(event){ |
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198 | // summary: |
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199 | // Called when the mouse is double is double clicked on the chart. Toggle between zoom and fit chart. |
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200 | var chart = this.chart, axis = chart.getAxis(this.axis); |
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201 | var scale = 1 / this.scaleFactor; |
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202 | // are we fit? |
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203 | if(axis.getWindowScale()==1){ |
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204 | // fit => zoom |
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205 | var scaler = axis.getScaler(), start = scaler.bounds.from, end = scaler.bounds.to, |
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206 | oldMiddle = (start + end) / 2, newMiddle = this.plot.toData({x: event.pageX, y: event.pageY})[this.axis], |
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207 | newStart = scale * (start - oldMiddle) + newMiddle, newEnd = scale * (end - oldMiddle) + newMiddle; |
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208 | chart.zoomIn(this.axis, [newStart, newEnd]); |
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209 | }else{ |
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210 | // non fit => fit |
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211 | chart.setAxisWindow(this.axis, 1, 0); |
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212 | chart.render(); |
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213 | } |
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214 | eventUtil.stop(event); |
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215 | }, |
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216 | |
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217 | _onZoom: function(scroll, event){ |
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218 | var scale = (scroll < 0 ? Math.abs(scroll)*this.scaleFactor : |
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219 | 1 / (Math.abs(scroll)*this.scaleFactor)); |
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220 | var chart = this.chart, axis = chart.getAxis(this.axis); |
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221 | // after wheel reset event position exactly if we could start a new scroll action |
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222 | var cscale = axis.getWindowScale(); |
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223 | if(cscale / scale > this.maxScale){ |
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224 | return; |
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225 | } |
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226 | var scaler = axis.getScaler(), start = scaler.bounds.from, end = scaler.bounds.to; |
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227 | // keep mouse pointer as transformation center if available otherwise center |
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228 | var middle = (event.type == "keypress") ? (start + end) / 2 : |
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229 | this.plot.toData({x: event.pageX, y: event.pageY})[this.axis]; |
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230 | var newStart = scale * (start - middle) + middle, newEnd = scale * (end - middle) + middle; |
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231 | chart.zoomIn(this.axis, [newStart, newEnd]); |
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232 | // do not scroll browser |
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233 | eventUtil.stop(event); |
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234 | }, |
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235 | |
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236 | _getDelta: function(event){ |
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237 | return this.chart.getAxis(this.axis).vertical?(this._startCoord- event.pageY):(event.pageX - this._startCoord); |
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238 | } |
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239 | }); |
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240 | return has("dojo-bidi")? declare("dojox.charting.action2d.MouseZoomAndPan", [MouseZoomAndPan, BidiMouseZoomAndPan]) : MouseZoomAndPan; |
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241 | }); |
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