Mercurial > dive4elements > river
annotate gwt-client/src/main/java/org/dive4elements/river/client/client/ui/chart/PanControl.java @ 7762:2a97d9c3413a
Use the river model_uuid as value for data items.
author | Raimund Renkert <rrenkert@intevation.de> |
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date | Thu, 27 Feb 2014 16:40:33 +0100 |
parents | ea9eef426962 |
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rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.client.client.ui.chart; |
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10 |
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11 import java.util.ArrayList; |
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12 import java.util.List; |
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13 |
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14 import com.google.gwt.core.client.GWT; |
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15 |
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16 import com.smartgwt.client.types.SelectionType; |
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17 import com.smartgwt.client.widgets.Canvas; |
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18 import com.smartgwt.client.widgets.Img; |
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19 import com.smartgwt.client.widgets.ImgButton; |
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20 import com.smartgwt.client.widgets.events.MouseDownEvent; |
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21 import com.smartgwt.client.widgets.events.MouseDownHandler; |
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22 import com.smartgwt.client.widgets.events.MouseMoveEvent; |
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23 import com.smartgwt.client.widgets.events.MouseMoveHandler; |
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24 import com.smartgwt.client.widgets.events.MouseOutEvent; |
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25 import com.smartgwt.client.widgets.events.MouseOutHandler; |
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26 import com.smartgwt.client.widgets.events.MouseUpEvent; |
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27 import com.smartgwt.client.widgets.events.MouseUpHandler; |
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28 |
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29 import org.dive4elements.river.client.client.event.HasPanHandlers; |
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30 import org.dive4elements.river.client.client.event.PanEvent; |
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31 import org.dive4elements.river.client.client.event.PanHandler; |
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32 |
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33 |
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34 /** |
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35 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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36 */ |
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37 public class PanControl |
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38 extends ImgButton |
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39 implements MouseDownHandler, MouseMoveHandler, MouseUpHandler, |
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40 MouseOutHandler, HasPanHandlers |
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41 { |
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42 protected ChartOutputTab chartTab; |
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43 |
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44 protected List<PanHandler> handlers; |
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45 |
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46 protected int[] start; |
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47 protected int[] end; |
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48 |
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49 |
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50 public PanControl(ChartOutputTab chartTab, String imageUrl) { |
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51 super(); |
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52 |
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53 this.chartTab = chartTab; |
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54 this.handlers = new ArrayList<PanHandler>(); |
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55 this.start = new int[] { -1, -1 }; |
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56 this.end = new int[] { -1, -1 }; |
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57 |
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58 String baseUrl = GWT.getHostPageBaseURL(); |
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59 setSrc(baseUrl + imageUrl); |
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60 setActionType(SelectionType.CHECKBOX); |
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61 setSize(20); |
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62 setShowRollOver(false); |
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63 setSelected(false); |
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64 |
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65 chartTab.getChartPanel().addMouseDownHandler(this); |
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66 chartTab.getChartPanel().addMouseMoveHandler(this); |
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67 chartTab.getChartPanel().addMouseUpHandler(this); |
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68 chartTab.getChartPanel().addMouseOutHandler(this); |
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69 } |
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70 |
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71 |
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72 /** |
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73 * Method used to register a new PanHandler. |
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74 * |
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75 * @param handler A new PanHandler. |
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76 */ |
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77 public void addPanHandler(PanHandler handler) { |
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78 if (handler != null) { |
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79 handlers.add(handler); |
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80 } |
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81 } |
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82 |
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83 |
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84 /** |
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85 * This event starts the dragging operation if the control is activated. |
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86 * |
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87 * @param event The mouse down event which contains the start coordinates. |
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88 */ |
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89 public void onMouseDown(MouseDownEvent event) { |
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90 if (!isSelected()) { |
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91 return; |
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92 } |
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93 |
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94 start[0] = event.getX(); |
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95 start[1] = event.getY(); |
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96 |
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97 end[0] = start[0]; |
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98 end[1] = start[1]; |
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99 } |
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100 |
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101 |
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102 /** |
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103 * This event is used to reposition the chart image based on the current |
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104 * drag operation. |
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105 * |
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106 * @param event The move event which contains the new coordinates to update |
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107 * the chart image position. |
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108 */ |
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109 public void onMouseMove(MouseMoveEvent event) { |
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110 if (!isSelected() || start[0] == -1 || start[1] == -1) { |
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111 return; |
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112 } |
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113 |
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114 int x = event.getX() - end[0]; |
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115 int y = event.getY() - end[1]; |
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116 |
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117 end[0] = end[0] + x; |
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118 end[1] = end[1] + y; |
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119 |
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120 Canvas c = chartTab.getChartImg(); |
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121 c.moveBy(x, y); |
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122 } |
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123 |
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124 |
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125 /** |
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126 * This event stops the dragging operation and fires a DragEnd event to the |
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127 * registered listeners. |
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128 * |
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129 * @param event The mouse up event which contains the end coordinates. |
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130 */ |
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131 public void onMouseUp(MouseUpEvent event) { |
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132 if (!isSelected()) { |
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133 return; |
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134 } |
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135 |
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136 end[0] = event.getX(); |
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137 end[1] = event.getY(); |
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138 |
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139 Canvas c = chartTab.getChartImg(); |
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140 c.setLeft(0); |
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141 c.setTop(0); |
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142 |
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143 fireOnPan(); |
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144 |
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145 start[0] = -1; |
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146 start[1] = -1; |
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147 } |
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148 |
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149 |
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150 /** |
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151 * This event is used to cancel the current dragging operation. |
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152 * |
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153 * @param event The mouse out event. |
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154 */ |
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155 public void onMouseOut(MouseOutEvent event) { |
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156 int x = event.getX(); |
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157 int y = event.getY(); |
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158 |
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159 if (!isSelected() || !isMouseOut(x, y) || start[0] == -1) { |
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160 return; |
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161 } |
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162 |
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163 Canvas c = chartTab.getChartImg(); |
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164 c.setLeft(0); |
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165 c.setTop(0); |
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166 |
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167 fireOnPan(); |
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168 |
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169 start[0] = -1; |
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170 start[1] = -1; |
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171 } |
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172 |
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173 |
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174 /** |
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175 * This method is required to check manually if the mouse pointer really |
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176 * moves out the chart area. The MouseOutEvent is also fired if the mouse |
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177 * goes down which doesn't seem to be correct. So, we gonna check this |
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178 * manually. |
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179 * |
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180 * @param x The x coordinate. |
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181 * @param y The y coordinate. |
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182 * |
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183 * @return true, if the mouse is really out of the chart area, otherwise |
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184 * false. |
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185 */ |
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186 protected boolean isMouseOut(int x, int y) { |
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187 Canvas chart = chartTab.getChartImg(); |
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188 |
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189 if (chart instanceof Img) { |
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190 chart = chart.getParentElement(); |
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191 } |
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192 |
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193 int left = chart.getPageLeft(); |
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194 int right = chart.getPageRight(); |
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195 int top = chart.getPageTop(); |
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196 int bottom = chart.getPageBottom(); |
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197 |
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198 if (x <= left || x >= right || y <= top || y >= bottom) { |
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199 return true; |
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200 } |
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201 |
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202 return false; |
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203 } |
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204 |
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205 |
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206 /** |
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207 * A pan event is fired to inform the registered listeners about a pan |
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208 * operation has finished. |
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209 */ |
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210 protected void fireOnPan() { |
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211 PanEvent event = new PanEvent(start, end); |
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212 |
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213 for (PanHandler handler: handlers) { |
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214 handler.onPan(event); |
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215 } |
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216 } |
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217 } |
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218 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |