Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/PanControl.java @ 551:13c7f90917fc

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Added a PanControl to pan charts. flys-client/trunk@2064 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 07 Jun 2011 13:07:27 +0000
parents
children c5fc3fa02edb
rev   line source
551
13c7f90917fc Added a PanControl to pan charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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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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11 import com.smartgwt.client.widgets.ImgButton;
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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.HasPanHandlers;
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22 import de.intevation.flys.client.client.event.PanEvent;
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23 import de.intevation.flys.client.client.event.PanHandler;
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24
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25
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26 /**
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27 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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28 */
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29 public class PanControl
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30 extends ImgButton
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31 implements MouseDownHandler, MouseMoveHandler, MouseUpHandler,
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32 MouseOutHandler, HasPanHandlers
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33 {
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34 protected ChartOutputTab chartTab;
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35
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36 protected List<PanHandler> handlers;
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37
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38 protected int[] start;
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39 protected int[] end;
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40
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41
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42 public PanControl(ChartOutputTab chartTab, String imageUrl) {
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43 super();
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44
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45 this.chartTab = chartTab;
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46 this.handlers = new ArrayList<PanHandler>();
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47 this.start = new int[] { -1, -1 };
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48 this.end = new int[] { -1, -1 };
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49
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50 String baseUrl = GWT.getHostPageBaseURL();
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51 setSrc(baseUrl + imageUrl);
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52 setActionType(SelectionType.CHECKBOX);
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53 setSize(20);
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54 setShowRollOver(false);
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55 setSelected(false);
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56
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57 chartTab.getChartPanel().addMouseDownHandler(this);
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58 chartTab.getChartPanel().addMouseMoveHandler(this);
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59 chartTab.getChartPanel().addMouseUpHandler(this);
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60 chartTab.getChartPanel().addMouseOutHandler(this);
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61 }
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62
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63
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64 /**
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65 * Method used to register a new PanHandler.
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66 *
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67 * @param handler A new PanHandler.
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68 */
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69 public void addPanHandler(PanHandler handler) {
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70 if (handler != null) {
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71 handlers.add(handler);
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72 }
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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 * This event starts the dragging operation if the control is activated.
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78 *
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79 * @param event The mouse down event which contains the start coordinates.
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80 */
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81 public void onMouseDown(MouseDownEvent event) {
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82 if (!isSelected()) {
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83 return;
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84 }
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85
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86 Canvas parent = chartTab.getChartPanel().getParentElement();
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87 parent.setOverflow(Overflow.HIDDEN);
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88
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89 start[0] = event.getX();
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90 start[1] = event.getY();
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91
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92 end[0] = start[0];
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93 end[1] = start[1];
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94 }
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95
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96
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97 /**
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98 * This event is used to reposition the chart image based on the current
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99 * drag operation.
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100 *
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101 * @param event The move event which contains the new coordinates to update
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102 * the chart image position.
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103 */
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104 public void onMouseMove(MouseMoveEvent event) {
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105 if (!isSelected() || start[0] == -1 || start[1] == -1) {
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106 return;
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107 }
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108
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109 int x = event.getX() - end[0];
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110 int y = event.getY() - end[1];
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111
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112 end[0] = end[0] + x;
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113 end[1] = end[1] + y;
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114
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115 Canvas c = chartTab.getChartPanel();
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116 c.moveBy(x, y);
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117 }
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118
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119
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120 /**
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121 * This event stops the dragging operation and fires a DragEnd event to the
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122 * registered listeners.
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123 *
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124 * @param event The mouse up event which contains the end coordinates.
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125 */
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126 public void onMouseUp(MouseUpEvent event) {
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127 if (!isSelected()) {
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128 return;
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129 }
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130
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131 end[0] = event.getX();
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132 end[1] = event.getY();
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133
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134 Canvas parent = chartTab.getChartPanel().getParentElement();
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135 parent.setOverflow(Overflow.AUTO);
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136
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137 fireOnPan();
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138
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139 start[0] = -1;
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140 start[1] = -1;
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141 }
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142
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143
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144 /**
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145 * This event is used to cancel the current dragging operation.
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146 *
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147 * @param event The mouse out event.
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148 */
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149 public void onMouseOut(MouseOutEvent event) {
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150 // TODO Cancel dragging if mouse pointer leaves chart area
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151 }
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152
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153
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154 /**
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155 * A pan event is fired to inform the registered listeners about a pan
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156 * operation has finished.
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157 */
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158 protected void fireOnPan() {
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159 PanEvent event = new PanEvent(start, end);
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160
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161 for (PanHandler handler: handlers) {
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162 handler.onPan(event);
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163 }
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164 }
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165 }
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166 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org