Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/MousePositionPanel.java @ 534:e08777967bad
Added a first implementation of a MousePositionPanel - work is not finished yet.
flys-client/trunk@2025 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Fri, 27 May 2011 15:38:24 +0000 |
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children | 75df57220104 |
rev | line source |
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534
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1 package de.intevation.flys.client.client.ui.chart; |
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2 |
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3 import com.smartgwt.client.core.Rectangle; |
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4 import com.smartgwt.client.types.Alignment; |
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5 import com.smartgwt.client.widgets.Canvas; |
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6 import com.smartgwt.client.widgets.Label; |
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7 import com.smartgwt.client.widgets.layout.HLayout; |
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8 import com.smartgwt.client.widgets.events.MouseMoveEvent; |
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9 import com.smartgwt.client.widgets.events.MouseMoveHandler; |
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10 import com.smartgwt.client.widgets.events.ResizedEvent; |
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11 import com.smartgwt.client.widgets.events.ResizedHandler; |
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12 |
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13 |
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14 /** |
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15 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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16 */ |
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17 public class MousePositionPanel |
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18 extends HLayout |
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19 implements MouseMoveHandler, ResizedHandler |
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20 { |
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21 protected Canvas window; |
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22 protected Rectangle viewport; |
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23 |
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24 protected Label x; |
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25 protected Label y; |
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26 |
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27 |
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28 public MousePositionPanel(Canvas window, Rectangle viewport) { |
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29 super(); |
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30 |
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31 this.window = window; |
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32 this.viewport = viewport; |
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33 |
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34 x = new Label(); |
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35 y = new Label(); |
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36 |
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37 initLayout(); |
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38 } |
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39 |
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40 |
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41 /** |
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42 * Initializes the layout of this component. |
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43 */ |
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44 protected void initLayout() { |
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45 setLayoutAlign(Alignment.RIGHT); |
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46 setMembersMargin(5); |
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47 |
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48 Label xDesc = new Label("Position: X = "); |
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49 Label yDesc = new Label("Y = "); |
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50 |
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51 xDesc.setWidth(60); |
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52 x.setWidth(25); |
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53 yDesc.setWidth(20); |
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54 y.setWidth(25); |
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55 |
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56 addMember(xDesc); |
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57 addMember(x); |
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58 addMember(yDesc); |
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59 addMember(y); |
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60 } |
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61 |
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62 |
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63 /** |
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64 * Computes the x|y position (in chart coordinates) and updates the position |
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65 * in the UI. |
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66 * |
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67 * @param event The MouseMoveEvent. |
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68 */ |
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69 public void onMouseMove(MouseMoveEvent event) { |
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70 int posX = event.getX(); |
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71 int posY = event.getY(); |
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72 |
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73 if (!validX(posX) || !validY(posY)) { |
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74 return; |
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75 } |
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76 |
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77 x.setContents(String.valueOf(getXPosition(posX))); |
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78 y.setContents(String.valueOf(getYPosition(posY))); |
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79 } |
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80 |
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81 |
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82 public void onResized(ResizedEvent event) { |
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83 } |
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84 |
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85 |
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86 /** |
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87 * Computes the left coordinate of the chart. |
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88 * |
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89 * @return the left coordinate of the chart. |
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90 */ |
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91 protected int computeMinX() { |
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92 return window.getPageLeft() + viewport.getLeft(); |
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93 } |
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94 |
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95 |
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96 /** |
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97 * Computes the right coordinate of the chart. |
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98 * |
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99 * @return the right coordinate of the chart. |
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100 */ |
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101 protected int computeMaxX() { |
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102 return window.getPageLeft() + window.getWidth() - viewport.getWidth(); |
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103 } |
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104 |
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105 |
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106 /** |
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107 * Computes the upper Y coordinate of the chart. |
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108 * |
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109 * @return the lower Y coordinate of the chart. |
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110 */ |
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111 protected int computeMinY() { |
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112 return window.getPageTop() + viewport.getTop(); |
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113 } |
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114 |
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115 |
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116 /** |
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117 * Computes the lower Y coordinate of the chart. |
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118 * |
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119 * @return the lower Y coordinate of the chart. |
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120 */ |
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121 protected int computeMaxY() { |
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122 return window.getPageBottom() - viewport.getHeight(); |
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123 } |
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124 |
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125 |
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126 /** |
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127 * Determines if the x value is in the valid range of the chart. |
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128 * |
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129 * @param x A pixel. |
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130 * |
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131 * @return true if the x position is valid, otherwise false. |
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132 */ |
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133 protected boolean validX(int x) { |
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134 return (x > computeMinX() && x < computeMaxX()); |
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135 } |
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136 |
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137 |
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138 /** |
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139 * Determines if the y value is in the valid range of the chart. |
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140 * |
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141 * @param y A pixel. |
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142 * |
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143 * @return true if the y position is valid, otherwise false. |
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144 */ |
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145 protected boolean validY(int y) { |
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146 return (y > computeMinY() && y < computeMaxY()); |
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147 } |
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148 |
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149 |
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150 /** |
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151 * Computes the X coordinate in a chart based on the current mouse position. |
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152 * |
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153 * @param pixel A pixel on the screen. |
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154 * |
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155 * @return the computed X value. |
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156 */ |
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157 protected double getXPosition(int pixel) { |
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158 // TODO Compute the x relative to the chart range |
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159 |
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160 return pixel - computeMinX(); |
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161 } |
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162 |
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163 |
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164 /** |
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165 * Computes the Y coordinate in a chart based on the current mouse position. |
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166 * |
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167 * @param pixel A pixel on the screen. |
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168 * |
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169 * @return the computed Y value. |
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170 */ |
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171 protected double getYPosition(int pixel) { |
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172 // TODO Compute the y relative to the chart range |
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173 |
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174 return pixel - computeMinY(); |
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175 } |
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176 } |
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177 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |