Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/ZoomboxControl.java @ 540:a866cdf1ca40

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Implemented a zoombox control and added it to the chart toolbar. flys-client/trunk@2040 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 01 Jun 2011 13:43:35 +0000
parents
children ed29599e06e5
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.smartgwt.client.types.Positioning;
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7 import com.smartgwt.client.types.SelectionType;
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8 import com.smartgwt.client.widgets.Button;
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9 import com.smartgwt.client.widgets.Canvas;
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10 import com.smartgwt.client.widgets.events.MouseDownEvent;
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11 import com.smartgwt.client.widgets.events.MouseDownHandler;
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12 import com.smartgwt.client.widgets.events.MouseMoveEvent;
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13 import com.smartgwt.client.widgets.events.MouseMoveHandler;
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14 import com.smartgwt.client.widgets.events.MouseUpEvent;
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15 import com.smartgwt.client.widgets.events.MouseUpHandler;
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16
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17 import de.intevation.flys.client.client.event.HasZoomHandlers;
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18 import de.intevation.flys.client.client.event.ZoomEvent;
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19 import de.intevation.flys.client.client.event.ZoomHandler;
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20
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21
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22 /**
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23 * This control observes that panel retrieved by ChartOutputTab.getChartPanel().
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24 * If activated, a zoombox is drawn. One of the two edges is the position of the
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25 * mouse down event on the observed panel. The other edge is specified by the
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26 * current mouse position. If the mouse up event occurs, start and end point
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27 * relative to the left and upper border of the observed panel is determined and
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28 * a ZoomEvent is fired.
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29 *
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30 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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31 */
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32 public class ZoomboxControl
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33 extends Button
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34 implements MouseDownHandler, MouseUpHandler, MouseMoveHandler, HasZoomHandlers
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35 {
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36 protected List<ZoomHandler> handlers;
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37
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38 protected ChartOutputTab chartTab;
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39
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40 protected Canvas zoombox;
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41
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42 protected int[] start;
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43 protected int[] end;
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44
a866cdf1ca40 Implemented a zoombox control and added it to the chart toolbar.
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45
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46 public ZoomboxControl(ChartOutputTab chartTab) {
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47 super("Zoombox");
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48
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49 this.handlers = new ArrayList<ZoomHandler>();
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50 this.chartTab = chartTab;
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51 this.start = new int[2];
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52 this.end = new int[2];
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53 this.zoombox = new Canvas();
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54
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55 initZoombox();
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56
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57 setActionType(SelectionType.CHECKBOX);
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58 setSelected(false);
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59
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60 chartTab.getChartPanel().addMouseDownHandler(this);
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61 chartTab.getChartPanel().addMouseMoveHandler(this);
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62 chartTab.getChartPanel().addMouseUpHandler(this);
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63 }
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64
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65
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66 /**
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67 * Initializes the zoombox that is displayed over the observed area. The
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68 * zoombox has an opaque background. Its height/width and x/y values are
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69 * determined by the start point (mouse down) and the current mouse
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70 * position.
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71 */
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72 protected void initZoombox() {
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73 zoombox.setPosition(Positioning.ABSOLUTE);
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74 zoombox.setBackgroundColor("red");
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75 zoombox.setOpacity(50);
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76 zoombox.setWidth(0);
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77 zoombox.setHeight(0);
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78 }
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79
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80
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81 /**
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82 * Registers a new ZoomHandler that wants to listen to ZoomEvents.
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83 *
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84 * @param handler A new ZoomHandler.
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85 */
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86 public void addZoomHandler(ZoomHandler handler) {
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87 if (handler != null) {
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88 handlers.add(handler);
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89 }
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90 }
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91
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92
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93 /**
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94 * A mouse down event on the specified area will set the start point for the
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95 * zoombox.
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96 *
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97 * @param event The mouse down event which contains the xy coordinates of
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98 * the observed area.
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99 */
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100 public void onMouseDown(MouseDownEvent event) {
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101 if (!isSelected()) {
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102 return;
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103 }
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104
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105 start[0] = getRelativeX(event.getX());
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106 start[1] = getRelativeY(event.getY());
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107
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108 end[0] = start[0];
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109 end[1] = start[1];
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110
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111 chartTab.getChartPanel().addChild(zoombox);
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112
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113 positionZoombox();
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114 }
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115
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116
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117 /**
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118 * A mouse move event on the specified area will set the end point for the
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119 * zoombox. If the end point differs from the start point, an opaque box is
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120 * displayed.
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121 *
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122 * @param event The mouse move event which contains the xy coordinates of
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123 * the observed area.
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124 */
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125 public void onMouseMove(MouseMoveEvent event) {
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126 if (!isSelected()) {
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127 return;
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128 }
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129
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130 end[0] = getRelativeX(event.getX());
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131 end[1] = getRelativeY(event.getY());
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132
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133 positionZoombox();
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134 }
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135
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136
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137 /**
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138 * The mouse up event finalizes the zoom operation. It sets the end point
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139 * for this operation, clears the zoombox and fires a ZoomEvent.
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140 *
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141 * @param event The mouse up event which contains the xy coordinates of the
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142 * observed area.
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143 */
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144 public void onMouseUp(MouseUpEvent event) {
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145 if (!isSelected()) {
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146 return;
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147 }
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148
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149 end[0] = getRelativeX(event.getX());
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150 end[1] = getRelativeY(event.getY());
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151
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152 clearZoombox();
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153
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154 chartTab.getChartPanel().removeChild(zoombox);
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155 }
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156
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157
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158 /**
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159 * Returns the X coordinate relative to the left border.
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160 *
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161 * @param x The X coordinate relative to the window.
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162 *
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163 * @return the X coordinate relative to the left border.
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164 */
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165 protected int getRelativeX(int x) {
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166 return x - chartTab.getChartPanel().getPageLeft();
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167 }
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168
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169
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170 /**
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171 * Returns the Y coordinate relative to the top border.
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172 *
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173 * @param y The Y coordinate relative to the window.
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174 *
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175 * @return the Y coordinate relative to the top border.
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176 */
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177 protected int getRelativeY(int y) {
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178 return y - chartTab.getChartPanel().getPageTop();
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179 }
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180
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181
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182 /**
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183 * Returns min and max x/y values based on the stored values in <i>start</i>
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184 * and <i>end</i>.
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185 *
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186 * @return an int[] as follows: [xmin, ymin, xmax, ymax].
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187 */
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188 protected int[] orderPositions() {
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189 int xmin = start[0] < end[0] ? start[0] : end[0];
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190 int ymin = start[1] < end[1] ? start[1] : end[1];
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191
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192 int xmax = start[0] >= end[0] ? start[0] : end[0];
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193 int ymax = start[1] >= end[1] ? start[1] : end[1];
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194
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195 return new int[] { xmin, ymin, xmax, ymax };
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196 }
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197
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198
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199 /**
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200 * Sets the width, height, x and y values of the zoombox.
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201 */
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202 protected void positionZoombox() {
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203 int[] values = orderPositions();
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204
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205 zoombox.setLeft(values[0]);
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206 zoombox.setTop(values[1]);
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207 zoombox.setWidth(values[2] - values[0]);
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208 zoombox.setHeight(values[3] - values[1]);
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209 }
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210
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211
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212 /**
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213 * Clears the zoombox (set position and size to null).
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214 */
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215 protected void clearZoombox() {
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216 zoombox.setLeft(0);
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217 zoombox.setTop(0);
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218 zoombox.setWidth(0);
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219 zoombox.setHeight(0);
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220 }
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221
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222
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223 /**
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224 * Fires a ZoomEvent to all registered listeners.
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225 */
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226 protected void fireZoomEvent() {
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227 int[] pos = orderPositions();
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228
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229 ZoomEvent event = new ZoomEvent(pos[0], pos[1], pos[2], pos[3]);
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230
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231 for (ZoomHandler handler: handlers) {
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232 handler.onZoom(event);
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233 }
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234 }
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235 }
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236 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org