1 | /**
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2 | *#########################################################################
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3 | *
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4 | * A component of the Gatherer application, part of the Greenstone digital
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5 | * library suite from the New Zealand Digital Library Project at the
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6 | * University of Waikato, New Zealand.
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7 | *
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8 | * Author: John Thompson, Greenstone Digital Library, University of Waikato
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9 | *
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10 | * Copyright (C) New Zealand Digital Library Project
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11 | *
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12 | * This program is free software; you can redistribute it and/or modify
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13 | * it under the terms of the GNU General Public License as published by
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14 | * the Free Software Foundation; either version 2 of the License, or
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15 | * (at your option) any later version.
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16 | *
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17 | * This program is distributed in the hope that it will be useful,
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | * GNU General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, write to the Free Software
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24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | *########################################################################
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26 | */
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27 | package org.greenstone.gatherer.gui;
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28 |
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29 |
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30 | import javax.swing.*;
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31 | import org.greenstone.gatherer.Dictionary;
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32 |
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33 |
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34 | /** A progress bar that doesn't pack a sad when you feed it longs (such as the sizes of files) which get mangled into negative numbers. I know how it feels, as I often have negative progress. Also tries to be efficent when updating the JProgressBar, so only updates when the value actually changes, which become necessary when you move a large number of files with millions of bytes (where upon shifting a file of a thousand bytes would be pretty insignificant, maybe not even a percent, but would fire several progress updates).
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35 | * @author John Thompson, Greenstone Digital Library, University of Waikato
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36 | */
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37 | public class GProgressBar
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38 | extends JProgressBar
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39 | {
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40 | private long cur_value = 0L;
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41 | private long max_value = 0L;
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42 |
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43 | /** The previous percentage value. */
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44 | private int previous = -1;
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45 |
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46 |
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47 | public GProgressBar()
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48 | {
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49 | super(0, 100);
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50 | this.setComponentOrientation(Dictionary.getOrientation());
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51 | }
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52 |
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53 |
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54 | public void addMaximum(long amount)
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55 | {
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56 | if (amount > 0) {
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57 | max_value = max_value + amount;
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58 | update();
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59 | }
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60 | }
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61 |
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62 |
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63 | public void addValue(long amount)
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64 | {
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65 | if (amount > 0) {
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66 | cur_value = cur_value + amount;
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67 | update();
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68 | }
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69 | }
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70 |
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71 |
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72 | public void clear()
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73 | {
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74 | previous = -1;
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75 | update();
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76 | }
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77 |
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78 |
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79 | public void reset()
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80 | {
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81 | cur_value = 0L;
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82 | max_value = 0L;
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83 | previous = -1;
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84 | update();
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85 | }
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86 |
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87 |
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88 | public void setIndeterminate(boolean indeterminate)
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89 | {
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90 | SwingUtilities.invokeLater(new SafeSetIndeterminateTask(indeterminate));
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91 | }
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92 |
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93 |
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94 | public void setString(String label)
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95 | {
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96 | SwingUtilities.invokeLater(new SafeSetStringTask(label));
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97 | }
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98 |
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99 |
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100 | public void setMaximum(int value)
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101 | {
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102 | max_value = value;
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103 | update();
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104 | }
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105 |
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106 |
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107 | public void setValue(int value)
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108 | {
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109 | cur_value = value;
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110 | update();
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111 | }
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112 |
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113 |
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114 | /** Only bother updating the progress bar if the percentage has changed. */
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115 | private void update()
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116 | {
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117 | int percentage = -1;
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118 | if (cur_value == 0L || max_value == 0L) {
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119 | percentage = 0;
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120 | }
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121 | else {
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122 | long per_value = (cur_value * 100) / max_value;
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123 | percentage = (int) per_value;
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124 | if (percentage > 100) {
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125 | percentage = 100;
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126 | }
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127 | }
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128 |
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129 | if (percentage != previous) {
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130 | previous = percentage;
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131 | setString(percentage + "%");
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132 | SwingUtilities.invokeLater(new SafeSetValueTask(percentage));
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133 | }
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134 | }
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135 |
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136 |
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137 | /** Internal class to call JProgressBar.setIndeterminate safely. */
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138 | private class SafeSetIndeterminateTask
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139 | implements Runnable
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140 | {
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141 | private boolean indeterminate;
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142 |
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143 | public SafeSetIndeterminateTask(boolean indeterminate)
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144 | {
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145 | this.indeterminate = indeterminate;
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146 | }
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147 |
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148 | public void run()
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149 | {
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150 | unsafeSetIndeterminate(indeterminate);
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151 | }
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152 | }
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153 |
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154 | /** This method is unsafe, -unless- it is called from the Event Queue (eg. from SafeSetIndeterminateTask). */
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155 | private void unsafeSetIndeterminate(boolean indeterminate)
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156 | {
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157 | super.setIndeterminate(indeterminate);
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158 | }
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159 |
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160 |
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161 | /** Internal class to call JProgressBar.setString safely. */
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162 | private class SafeSetStringTask
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163 | implements Runnable
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164 | {
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165 | private String label;
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166 |
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167 | public SafeSetStringTask(String label)
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168 | {
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169 | this.label = label;
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170 | }
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171 |
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172 | public void run()
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173 | {
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174 | unsafeSetString(label);
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175 | }
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176 | }
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177 |
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178 | /** This method is unsafe, -unless- it is called from the Event Queue (eg. from SafeSetStringTask). */
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179 | private void unsafeSetString(String label)
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180 | {
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181 | super.setString(label);
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182 | }
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183 |
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184 |
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185 | /** Internal class to call JProgressBar.setValue safely. */
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186 | private class SafeSetValueTask
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187 | implements Runnable
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188 | {
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189 | private int value;
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190 |
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191 | public SafeSetValueTask(int value)
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192 | {
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193 | this.value = value;
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194 | }
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195 |
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196 | public void run()
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197 | {
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198 | unsafeSetValue(value);
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199 | }
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200 | }
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201 |
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202 | /** This method is unsafe, -unless- it is called from the Event Queue (eg. from SafeSetValueTask). */
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203 | private void unsafeSetValue(int value)
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204 | {
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205 | super.setValue(value);
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206 | }
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207 | }
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