Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/ZoomboxControl.java @ 546:feaf6a8881ee

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Improved the zoombox control: cancel the zoom operation if the mouse pointer leaves the chart area. flys-client/trunk@2055 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 06 Jun 2011 08:21:08 +0000
parents 9c2cf4811a7d
children f1a559d13eef
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.MouseOutEvent;
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17 import com.smartgwt.client.widgets.events.MouseOutHandler;
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18 import com.smartgwt.client.widgets.events.MouseUpEvent;
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19 import com.smartgwt.client.widgets.events.MouseUpHandler;
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20
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21 import de.intevation.flys.client.client.event.HasZoomHandlers;
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22 import de.intevation.flys.client.client.event.ZoomEvent;
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23 import de.intevation.flys.client.client.event.ZoomHandler;
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24
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25
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26 /**
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27 * This control observes that panel retrieved by ChartOutputTab.getChartPanel().
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28 * If activated, a zoombox is drawn. One of the two edges is the position of the
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29 * mouse down event on the observed panel. The other edge is specified by the
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30 * current mouse position. If the mouse up event occurs, start and end point
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31 * relative to the left and upper border of the observed panel is determined and
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32 * a ZoomEvent is fired.
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33 *
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34 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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35 */
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36 public class ZoomboxControl
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37 extends ImgButton
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38 implements MouseDownHandler, MouseUpHandler, MouseMoveHandler, HasZoomHandlers,
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39 MouseOutHandler
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40 {
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41 protected List<ZoomHandler> handlers;
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42
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43 protected ChartOutputTab chartTab;
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44
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45 protected Canvas zoombox;
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46
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47 protected int[] start;
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48 protected int[] end;
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49
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50
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51 public ZoomboxControl(ChartOutputTab chartTab, String imageUrl) {
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52 super();
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53
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54 this.handlers = new ArrayList<ZoomHandler>();
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55 this.chartTab = chartTab;
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56 this.start = new int[2];
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57 this.end = new int[2];
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58 this.zoombox = new Canvas();
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59
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60 initZoombox();
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61
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62 String baseUrl = GWT.getHostPageBaseURL();
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63 setSrc(baseUrl + imageUrl);
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64 setActionType(SelectionType.CHECKBOX);
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65 setSize(20);
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66 setShowRollOver(false);
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67 setSelected(false);
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68
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69 chartTab.getChartPanel().addMouseDownHandler(this);
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70 chartTab.getChartPanel().addMouseOutHandler(this);
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71 chartTab.getChartPanel().addMouseMoveHandler(this);
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72 chartTab.getChartPanel().addMouseUpHandler(this);
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73 }
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74
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75
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76 /**
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77 * Initializes the zoombox that is displayed over the observed area. The
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78 * zoombox has an opaque background. Its height/width and x/y values are
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79 * determined by the start point (mouse down) and the current mouse
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80 * position.
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81 */
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82 protected void initZoombox() {
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83 zoombox.setPosition(Positioning.ABSOLUTE);
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84 zoombox.setBorder("2px solid black");
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85 zoombox.setOpacity(50);
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86 zoombox.setWidth(0);
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87 zoombox.setHeight(0);
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88 }
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89
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90
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91 /**
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92 * Registers a new ZoomHandler that wants to listen to ZoomEvents.
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93 *
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94 * @param handler A new ZoomHandler.
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95 */
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96 public void addZoomHandler(ZoomHandler handler) {
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97 if (handler != null) {
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98 handlers.add(handler);
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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 /**
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104 * A mouse down event on the specified area will set the start point for the
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105 * zoombox.
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106 *
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107 * @param event The mouse down event which contains the xy coordinates of
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108 * the observed area.
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109 */
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110 public void onMouseDown(MouseDownEvent event) {
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111 if (!isSelected()) {
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112 return;
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113 }
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114
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115 start[0] = getRelativeX(event.getX());
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116 start[1] = getRelativeY(event.getY());
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117
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118 end[0] = start[0];
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119 end[1] = start[1];
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120
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121 Canvas c = getChartPanel();
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122 c.addChild(zoombox);
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123
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124 positionZoombox();
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125 }
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126
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127
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128 /**
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129 * A mouse move event on the specified area will set the end point for the
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130 * zoombox. If the end point differs from the start point, an opaque box is
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131 * displayed.
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132 *
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133 * @param event The mouse move event which contains the xy coordinates of
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134 * the observed area.
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135 */
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136 public void onMouseMove(MouseMoveEvent event) {
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137 if (!isSelected()) {
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138 return;
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139 }
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140
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141 end[0] = getRelativeX(event.getX());
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142 end[1] = getRelativeY(event.getY());
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143
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144 positionZoombox();
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145 }
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146
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147
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148 /**
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149 * The mouse up event finalizes the zoom operation. It sets the end point
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150 * for this operation, clears the zoombox and fires a ZoomEvent.
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151 *
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152 * @param event The mouse up event which contains the xy coordinates of the
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153 * observed area.
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154 */
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155 public void onMouseUp(MouseUpEvent event) {
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156 if (!isSelected()) {
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157 return;
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158 }
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159
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160 end[0] = getRelativeX(event.getX());
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161 end[1] = getRelativeY(event.getY());
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162
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163 fireZoomEvent();
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164
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165 clearZoombox();
546
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166 }
540
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167
546
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168
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169 /**
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170 * The mouse out event is used to cancel an active zoom operation.
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171 *
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172 * @param event The mouse out event.
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173 */
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174 public void onMouseOut(MouseOutEvent event) {
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175 if (!isSelected() || !isMouseOut(event.getX(), event.getY())) {
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176 return;
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177 }
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178
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179 start[0] = 0;
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180 start[1] = 0;
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181 end[0] = 0;
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182 end[1] = 0;
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183
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184 clearZoombox();
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185 }
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186
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187
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188 /**
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189 * Returns the chart panel.
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190 *
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191 * @return the chart panel.
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192 */
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193 protected Canvas getChartPanel() {
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194 return chartTab.getChartPanel();
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195 }
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196
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197
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198 /**
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199 * This method is required to check manually if the mouse pointer really
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200 * moves out the chart area. The MouseOutEvent is also fired if the mouse
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201 * goes down which doesn't seem to be correct. So, we gonna check this
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202 * manually.
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203 *
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204 * @param x The x coordinate.
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205 * @param y The y coordinate.
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206 *
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207 * @return true, if the mouse is really out of the chart area, otherwise
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208 * false.
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209 */
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210 protected boolean isMouseOut(int x, int y) {
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211 Canvas chart = getChartPanel();
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212
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213 int left = chart.getPageLeft();
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214 int right = chart.getPageRight();
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215 int top = chart.getPageTop();
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216 int bottom = chart.getPageBottom();
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217
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218 if (x <= left || x >= right || y <= top || y >= bottom) {
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219 return true;
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220 }
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221
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222 return false;
540
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223 }
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224
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225
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226 /**
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227 * Returns the X coordinate relative to the left border.
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228 *
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229 * @param x The X coordinate relative to the window.
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230 *
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231 * @return the X coordinate relative to the left border.
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232 */
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233 protected int getRelativeX(int x) {
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234 return x - chartTab.getChartPanel().getPageLeft();
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235 }
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236
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237
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238 /**
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239 * Returns the Y coordinate relative to the top border.
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240 *
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241 * @param y The Y coordinate relative to the window.
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242 *
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243 * @return the Y coordinate relative to the top border.
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244 */
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245 protected int getRelativeY(int y) {
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246 return y - chartTab.getChartPanel().getPageTop();
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247 }
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248
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249
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250 /**
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251 * Returns min and max x/y values based on the stored values in <i>start</i>
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252 * and <i>end</i>.
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253 *
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254 * @return an int[] as follows: [xmin, ymin, xmax, ymax].
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255 */
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256 protected int[] orderPositions() {
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257 int xmin = start[0] < end[0] ? start[0] : end[0];
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258 int ymin = start[1] < end[1] ? start[1] : end[1];
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259
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260 int xmax = start[0] >= end[0] ? start[0] : end[0];
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261 int ymax = start[1] >= end[1] ? start[1] : end[1];
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262
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263 return new int[] { xmin, ymin, xmax, ymax };
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264 }
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265
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266
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267 /**
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268 * Sets the width, height, x and y values of the zoombox.
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269 */
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270 protected void positionZoombox() {
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271 int[] values = orderPositions();
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272
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273 zoombox.setLeft(values[0]);
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274 zoombox.setTop(values[1]);
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275 zoombox.setWidth(values[2] - values[0]);
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276 zoombox.setHeight(values[3] - values[1]);
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277 }
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278
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279
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280 /**
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281 * Clears the zoombox (set position and size to null).
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282 */
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283 protected void clearZoombox() {
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284 zoombox.setLeft(0);
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285 zoombox.setTop(0);
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286 zoombox.setWidth(0);
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287 zoombox.setHeight(0);
546
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288
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289 Canvas c = getChartPanel();
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290 c.removeChild(zoombox);
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291 }
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292
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293
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294 /**
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295 * Fires a ZoomEvent to all registered listeners.
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296 */
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297 protected void fireZoomEvent() {
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298 int[] pos = orderPositions();
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299
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300 ZoomEvent event = new ZoomEvent(pos[0], pos[1], pos[2], pos[3]);
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301
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302 for (ZoomHandler handler: handlers) {
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303 handler.onZoom(event);
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304 }
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305 }
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306 }
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307 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org