Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/ZoomboxControl.java @ 543:9c2cf4811a7d

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Added a control to reset the zoom of a chart. In addition, the zoom buttons are displayed as ImgButtons now. flys-client/trunk@2049 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 03 Jun 2011 08:20:22 +0000
parents ed29599e06e5
children feaf6a8881ee
rev   line source
540
a866cdf1ca40 Implemented a zoombox control and added it to the chart toolbar.
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1 package de.intevation.flys.client.client.ui.chart;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 import com.google.gwt.core.client.GWT;
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7
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8 import com.smartgwt.client.types.Positioning;
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9 import com.smartgwt.client.types.SelectionType;
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10 import com.smartgwt.client.widgets.ImgButton;
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11 import com.smartgwt.client.widgets.Canvas;
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12 import com.smartgwt.client.widgets.events.MouseDownEvent;
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13 import com.smartgwt.client.widgets.events.MouseDownHandler;
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14 import com.smartgwt.client.widgets.events.MouseMoveEvent;
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15 import com.smartgwt.client.widgets.events.MouseMoveHandler;
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16 import com.smartgwt.client.widgets.events.MouseUpEvent;
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17 import com.smartgwt.client.widgets.events.MouseUpHandler;
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18
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19 import de.intevation.flys.client.client.event.HasZoomHandlers;
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20 import de.intevation.flys.client.client.event.ZoomEvent;
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21 import de.intevation.flys.client.client.event.ZoomHandler;
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22
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23
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24 /**
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25 * This control observes that panel retrieved by ChartOutputTab.getChartPanel().
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26 * If activated, a zoombox is drawn. One of the two edges is the position of the
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27 * mouse down event on the observed panel. The other edge is specified by the
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28 * current mouse position. If the mouse up event occurs, start and end point
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29 * relative to the left and upper border of the observed panel is determined and
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30 * a ZoomEvent is fired.
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31 *
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32 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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33 */
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34 public class ZoomboxControl
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35 extends ImgButton
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36 implements MouseDownHandler, MouseUpHandler, MouseMoveHandler, HasZoomHandlers
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37 {
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38 protected List<ZoomHandler> handlers;
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39
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40 protected ChartOutputTab chartTab;
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41
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42 protected Canvas zoombox;
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43
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44 protected int[] start;
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45 protected int[] end;
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46
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47
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48 public ZoomboxControl(ChartOutputTab chartTab, String imageUrl) {
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49 super();
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50
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51 this.handlers = new ArrayList<ZoomHandler>();
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52 this.chartTab = chartTab;
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53 this.start = new int[2];
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54 this.end = new int[2];
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55 this.zoombox = new Canvas();
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56
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57 initZoombox();
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58
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59 String baseUrl = GWT.getHostPageBaseURL();
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60 setSrc(baseUrl + imageUrl);
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61 setActionType(SelectionType.CHECKBOX);
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62 setSize(20);
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63 setShowRollOver(false);
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64 setSelected(false);
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65
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66 chartTab.getChartPanel().addMouseDownHandler(this);
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67 chartTab.getChartPanel().addMouseMoveHandler(this);
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68 chartTab.getChartPanel().addMouseUpHandler(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 * Initializes the zoombox that is displayed over the observed area. The
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74 * zoombox has an opaque background. Its height/width and x/y values are
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75 * determined by the start point (mouse down) and the current mouse
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76 * position.
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77 */
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78 protected void initZoombox() {
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79 zoombox.setPosition(Positioning.ABSOLUTE);
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80 zoombox.setBorder("2px solid black");
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81 zoombox.setOpacity(50);
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82 zoombox.setWidth(0);
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83 zoombox.setHeight(0);
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84 }
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85
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86
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87 /**
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88 * Registers a new ZoomHandler that wants to listen to ZoomEvents.
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89 *
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90 * @param handler A new ZoomHandler.
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91 */
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92 public void addZoomHandler(ZoomHandler handler) {
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93 if (handler != null) {
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94 handlers.add(handler);
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95 }
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96 }
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97
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98
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99 /**
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100 * A mouse down event on the specified area will set the start point for the
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101 * zoombox.
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102 *
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103 * @param event The mouse down event which contains the xy coordinates of
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104 * the observed area.
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105 */
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106 public void onMouseDown(MouseDownEvent event) {
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107 if (!isSelected()) {
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108 return;
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109 }
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110
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111 start[0] = getRelativeX(event.getX());
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112 start[1] = getRelativeY(event.getY());
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113
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114 end[0] = start[0];
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115 end[1] = start[1];
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116
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117 chartTab.getChartPanel().addChild(zoombox);
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118
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119 positionZoombox();
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120 }
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121
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122
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123 /**
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124 * A mouse move event on the specified area will set the end point for the
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125 * zoombox. If the end point differs from the start point, an opaque box is
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126 * displayed.
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127 *
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128 * @param event The mouse move event which contains the xy coordinates of
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129 * the observed area.
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130 */
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131 public void onMouseMove(MouseMoveEvent 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] = getRelativeX(event.getX());
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137 end[1] = getRelativeY(event.getY());
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138
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139 positionZoombox();
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140 }
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141
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142
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143 /**
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144 * The mouse up event finalizes the zoom operation. It sets the end point
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145 * for this operation, clears the zoombox and fires a ZoomEvent.
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146 *
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147 * @param event The mouse up event which contains the xy coordinates of the
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148 * observed area.
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149 */
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150 public void onMouseUp(MouseUpEvent event) {
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151 if (!isSelected()) {
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152 return;
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153 }
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154
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155 end[0] = getRelativeX(event.getX());
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156 end[1] = getRelativeY(event.getY());
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157
541
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158 fireZoomEvent();
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159
540
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160 clearZoombox();
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161
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162 chartTab.getChartPanel().removeChild(zoombox);
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163 }
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164
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165
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166 /**
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167 * Returns the X coordinate relative to the left border.
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168 *
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169 * @param x The X coordinate relative to the window.
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170 *
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171 * @return the X coordinate relative to the left border.
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172 */
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173 protected int getRelativeX(int x) {
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174 return x - chartTab.getChartPanel().getPageLeft();
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175 }
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176
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177
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178 /**
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179 * Returns the Y coordinate relative to the top border.
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180 *
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181 * @param y The Y coordinate relative to the window.
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182 *
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183 * @return the Y coordinate relative to the top border.
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184 */
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185 protected int getRelativeY(int y) {
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186 return y - chartTab.getChartPanel().getPageTop();
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187 }
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188
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189
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190 /**
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191 * Returns min and max x/y values based on the stored values in <i>start</i>
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192 * and <i>end</i>.
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193 *
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194 * @return an int[] as follows: [xmin, ymin, xmax, ymax].
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195 */
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196 protected int[] orderPositions() {
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197 int xmin = start[0] < end[0] ? start[0] : end[0];
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198 int ymin = start[1] < end[1] ? start[1] : end[1];
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199
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200 int xmax = start[0] >= end[0] ? start[0] : end[0];
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201 int ymax = start[1] >= end[1] ? start[1] : end[1];
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202
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203 return new int[] { xmin, ymin, xmax, ymax };
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204 }
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205
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206
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207 /**
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208 * Sets the width, height, x and y values of the zoombox.
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209 */
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210 protected void positionZoombox() {
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211 int[] values = orderPositions();
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212
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213 zoombox.setLeft(values[0]);
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214 zoombox.setTop(values[1]);
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215 zoombox.setWidth(values[2] - values[0]);
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216 zoombox.setHeight(values[3] - values[1]);
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217 }
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218
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219
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220 /**
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221 * Clears the zoombox (set position and size to null).
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222 */
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223 protected void clearZoombox() {
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224 zoombox.setLeft(0);
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225 zoombox.setTop(0);
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226 zoombox.setWidth(0);
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227 zoombox.setHeight(0);
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228 }
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229
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230
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231 /**
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232 * Fires a ZoomEvent to all registered listeners.
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233 */
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234 protected void fireZoomEvent() {
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235 int[] pos = orderPositions();
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236
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237 ZoomEvent event = new ZoomEvent(pos[0], pos[1], pos[2], pos[3]);
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238
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239 for (ZoomHandler handler: handlers) {
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240 handler.onZoom(event);
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241 }
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242 }
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243 }
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244 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org