Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/PanControl.java @ 553:c5fc3fa02edb

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The MouseOut event will now finish a current pan operation. flys-client/trunk@2067 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 07 Jun 2011 13:58:38 +0000
parents 13c7f90917fc
children ea2191b1299d
rev   line source
551
13c7f90917fc Added a PanControl to pan charts.
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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.Overflow;
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9 import com.smartgwt.client.types.SelectionType;
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10 import com.smartgwt.client.widgets.Canvas;
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c5fc3fa02edb The MouseOut event will now finish a current pan operation.
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11 import com.smartgwt.client.widgets.Img;
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12 import com.smartgwt.client.widgets.ImgButton;
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13 import com.smartgwt.client.widgets.events.MouseDownEvent;
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14 import com.smartgwt.client.widgets.events.MouseDownHandler;
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15 import com.smartgwt.client.widgets.events.MouseMoveEvent;
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16 import com.smartgwt.client.widgets.events.MouseMoveHandler;
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17 import com.smartgwt.client.widgets.events.MouseOutEvent;
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18 import com.smartgwt.client.widgets.events.MouseOutHandler;
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19 import com.smartgwt.client.widgets.events.MouseUpEvent;
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20 import com.smartgwt.client.widgets.events.MouseUpHandler;
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21
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22 import de.intevation.flys.client.client.event.HasPanHandlers;
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23 import de.intevation.flys.client.client.event.PanEvent;
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24 import de.intevation.flys.client.client.event.PanHandler;
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25
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26
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27 /**
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28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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29 */
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30 public class PanControl
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31 extends ImgButton
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32 implements MouseDownHandler, MouseMoveHandler, MouseUpHandler,
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33 MouseOutHandler, HasPanHandlers
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34 {
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35 protected ChartOutputTab chartTab;
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36
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37 protected List<PanHandler> handlers;
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38
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39 protected int[] start;
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40 protected int[] end;
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41
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42
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43 public PanControl(ChartOutputTab chartTab, String imageUrl) {
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44 super();
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45
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46 this.chartTab = chartTab;
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47 this.handlers = new ArrayList<PanHandler>();
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48 this.start = new int[] { -1, -1 };
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49 this.end = new int[] { -1, -1 };
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50
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51 String baseUrl = GWT.getHostPageBaseURL();
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52 setSrc(baseUrl + imageUrl);
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53 setActionType(SelectionType.CHECKBOX);
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54 setSize(20);
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55 setShowRollOver(false);
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56 setSelected(false);
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57
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58 chartTab.getChartPanel().addMouseDownHandler(this);
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59 chartTab.getChartPanel().addMouseMoveHandler(this);
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60 chartTab.getChartPanel().addMouseUpHandler(this);
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61 chartTab.getChartPanel().addMouseOutHandler(this);
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62 }
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63
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64
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65 /**
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66 * Method used to register a new PanHandler.
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67 *
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68 * @param handler A new PanHandler.
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69 */
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70 public void addPanHandler(PanHandler handler) {
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71 if (handler != null) {
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72 handlers.add(handler);
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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 /**
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78 * This event starts the dragging operation if the control is activated.
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79 *
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80 * @param event The mouse down event which contains the start coordinates.
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81 */
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82 public void onMouseDown(MouseDownEvent event) {
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83 if (!isSelected()) {
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84 return;
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85 }
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86
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87 Canvas parent = chartTab.getChartPanel().getParentElement();
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88 parent.setOverflow(Overflow.HIDDEN);
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89
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90 start[0] = event.getX();
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91 start[1] = event.getY();
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92
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93 end[0] = start[0];
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94 end[1] = start[1];
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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 * This event is used to reposition the chart image based on the current
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100 * drag operation.
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101 *
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102 * @param event The move event which contains the new coordinates to update
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103 * the chart image position.
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104 */
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105 public void onMouseMove(MouseMoveEvent event) {
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106 if (!isSelected() || start[0] == -1 || start[1] == -1) {
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107 return;
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108 }
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109
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110 int x = event.getX() - end[0];
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111 int y = event.getY() - end[1];
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112
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113 end[0] = end[0] + x;
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114 end[1] = end[1] + y;
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115
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116 Canvas c = chartTab.getChartPanel();
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117 c.moveBy(x, y);
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118 }
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119
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120
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121 /**
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122 * This event stops the dragging operation and fires a DragEnd event to the
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123 * registered listeners.
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124 *
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125 * @param event The mouse up event which contains the end coordinates.
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126 */
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127 public void onMouseUp(MouseUpEvent event) {
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128 if (!isSelected()) {
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129 return;
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130 }
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131
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132 end[0] = event.getX();
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133 end[1] = event.getY();
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134
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135 Canvas parent = chartTab.getChartPanel().getParentElement();
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136 parent.setOverflow(Overflow.AUTO);
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137
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138 fireOnPan();
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139
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140 start[0] = -1;
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141 start[1] = -1;
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142 }
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143
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144
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145 /**
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146 * This event is used to cancel the current dragging operation.
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147 *
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148 * @param event The mouse out event.
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149 */
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150 public void onMouseOut(MouseOutEvent event) {
553
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151 int x = event.getX();
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152 int y = event.getY();
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153
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154 if (!isSelected() || !isMouseOut(x, y) || start[0] == -1) {
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155 return;
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156 }
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157
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158 Canvas parent = chartTab.getChartPanel().getParentElement();
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159 parent.setOverflow(Overflow.AUTO);
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160
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161 fireOnPan();
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162
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163 start[0] = -1;
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164 start[1] = -1;
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165 }
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166
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167
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168 /**
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169 * This method is required to check manually if the mouse pointer really
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170 * moves out the chart area. The MouseOutEvent is also fired if the mouse
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171 * goes down which doesn't seem to be correct. So, we gonna check this
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172 * manually.
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173 *
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174 * @param x The x coordinate.
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175 * @param y The y coordinate.
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176 *
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177 * @return true, if the mouse is really out of the chart area, otherwise
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178 * false.
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179 */
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180 protected boolean isMouseOut(int x, int y) {
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181 Canvas chart = chartTab.getChartPanel();
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182
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183 if (chart instanceof Img) {
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184 chart = chart.getParentElement();
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185 }
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186
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187 int left = chart.getPageLeft();
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188 int right = chart.getPageRight();
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189 int top = chart.getPageTop();
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190 int bottom = chart.getPageBottom();
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191
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192 if (x <= left || x >= right || y <= top || y >= bottom) {
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193 return true;
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194 }
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195
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196 return false;
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197 }
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198
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199
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200 /**
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201 * A pan event is fired to inform the registered listeners about a pan
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202 * operation has finished.
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203 */
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204 protected void fireOnPan() {
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205 PanEvent event = new PanEvent(start, end);
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206
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207 for (PanHandler handler: handlers) {
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208 handler.onPan(event);
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209 }
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210 }
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211 }
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212 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org