1 | package fr.mael.jiwigo.transverse.util.filedrop; |
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2 | |
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3 | import java.awt.datatransfer.DataFlavor; |
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4 | import java.io.BufferedReader; |
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5 | import java.io.File; |
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6 | import java.io.IOException; |
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7 | import java.io.PrintStream; |
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8 | import java.io.Reader; |
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9 | |
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10 | import net.iharder.dnd.FileDropListener; |
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11 | |
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12 | /** |
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13 | * This class makes it easy to drag and drop files from the operating |
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14 | * system to a Java program. Any <tt>java.awt.Component</tt> can be |
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15 | * dropped onto, but only <tt>javax.swing.JComponent</tt>s will indicate |
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16 | * the drop event with a changed border. |
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17 | * <p/> |
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18 | * To use this class, construct a new <tt>FileDrop</tt> by passing |
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19 | * it the target component and a <tt>Listener</tt> to receive notification |
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20 | * when file(s) have been dropped. Here is an example: |
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21 | * <p/> |
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22 | * <code><pre> |
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23 | * JPanel myPanel = new JPanel(); |
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24 | * new FileDrop( myPanel, new FileDrop.Listener() |
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25 | * { public void filesDropped( java.io.File[] files ) |
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26 | * { |
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27 | * // handle file drop |
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28 | * ... |
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29 | * } // end filesDropped |
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30 | * }); // end FileDrop.Listener |
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31 | * </pre></code> |
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32 | * <p/> |
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33 | * You can specify the border that will appear when files are being dragged by |
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34 | * calling the constructor with a <tt>javax.swing.border.Border</tt>. Only |
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35 | * <tt>JComponent</tt>s will show any indication with a border. |
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36 | * <p/> |
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37 | * You can turn on some debugging features by passing a <tt>PrintStream</tt> |
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38 | * object (such as <tt>System.out</tt>) into the full constructor. A <tt>null</tt> |
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39 | * value will result in no extra debugging information being output. |
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40 | * <p/> |
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41 | * |
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42 | * <p>I'm releasing this code into the Public Domain. Enjoy. |
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43 | * </p> |
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44 | * <p><em>Original author: Robert Harder, rharder@usa.net</em></p> |
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45 | * <p>2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.</p> |
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46 | * |
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47 | * @author Robert Harder |
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48 | * @author rharder@users.sf.net |
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49 | * @version 1.0.1 |
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50 | */ |
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51 | public class FileDrop { |
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52 | private transient javax.swing.border.Border normalBorder; |
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53 | private transient java.awt.dnd.DropTargetListener dropListener; |
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54 | |
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55 | /** Discover if the running JVM is modern enough to have drag and drop. */ |
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56 | private static Boolean supportsDnD; |
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57 | |
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58 | // Default border color |
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59 | private static java.awt.Color defaultBorderColor = new java.awt.Color(0f, 0f, 1f, 0.25f); |
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60 | |
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61 | /** |
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62 | * Constructs a {@link FileDrop} with a default light-blue border |
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63 | * and, if <var>c</var> is a {@link java.awt.Container}, recursively |
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64 | * sets all elements contained within as drop targets, though only |
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65 | * the top level container will change borders. |
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66 | * |
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67 | * @param c Component on which files will be dropped. |
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68 | * @param listener Listens for <tt>filesDropped</tt>. |
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69 | * @since 1.0 |
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70 | */ |
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71 | public FileDrop(final java.awt.Component c, final Listener listener) { |
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72 | this(null, // Logging stream |
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73 | c, // Drop target |
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74 | javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2, defaultBorderColor), // Drag border |
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75 | true, // Recursive |
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76 | listener); |
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77 | } // end constructor |
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78 | |
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79 | /** |
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80 | * Constructor with a default border and the option to recursively set drop targets. |
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81 | * If your component is a <tt>java.awt.Container</tt>, then each of its children |
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82 | * components will also listen for drops, though only the parent will change borders. |
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83 | * |
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84 | * @param c Component on which files will be dropped. |
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85 | * @param recursive Recursively set children as drop targets. |
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86 | * @param listener Listens for <tt>filesDropped</tt>. |
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87 | * @since 1.0 |
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88 | */ |
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89 | public FileDrop(final java.awt.Component c, final boolean recursive, final Listener listener) { |
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90 | this(null, // Logging stream |
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91 | c, // Drop target |
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92 | javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2, defaultBorderColor), // Drag border |
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93 | recursive, // Recursive |
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94 | listener); |
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95 | } // end constructor |
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96 | |
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97 | /** |
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98 | * Constructor with a default border and debugging optionally turned on. |
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99 | * With Debugging turned on, more status messages will be displayed to |
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100 | * <tt>out</tt>. A common way to use this constructor is with |
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101 | * <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for |
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102 | * the parameter <tt>out</tt> will result in no debugging output. |
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103 | * |
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104 | * @param out PrintStream to record debugging info or null for no debugging. |
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105 | * @param out |
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106 | * @param c Component on which files will be dropped. |
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107 | * @param listener Listens for <tt>filesDropped</tt>. |
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108 | * @since 1.0 |
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109 | */ |
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110 | public FileDrop(final java.io.PrintStream out, final java.awt.Component c, final Listener listener) { |
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111 | this(out, // Logging stream |
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112 | c, // Drop target |
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113 | javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2, defaultBorderColor), false, // Recursive |
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114 | listener); |
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115 | } // end constructor |
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116 | |
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117 | /** |
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118 | * Constructor with a default border, debugging optionally turned on |
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119 | * and the option to recursively set drop targets. |
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120 | * If your component is a <tt>java.awt.Container</tt>, then each of its children |
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121 | * components will also listen for drops, though only the parent will change borders. |
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122 | * With Debugging turned on, more status messages will be displayed to |
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123 | * <tt>out</tt>. A common way to use this constructor is with |
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124 | * <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for |
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125 | * the parameter <tt>out</tt> will result in no debugging output. |
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126 | * |
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127 | * @param out PrintStream to record debugging info or null for no debugging. |
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128 | * @param out |
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129 | * @param c Component on which files will be dropped. |
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130 | * @param recursive Recursively set children as drop targets. |
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131 | * @param listener Listens for <tt>filesDropped</tt>. |
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132 | * @since 1.0 |
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133 | */ |
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134 | public FileDrop(final java.io.PrintStream out, final java.awt.Component c, final boolean recursive, |
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135 | final Listener listener) { |
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136 | this(out, // Logging stream |
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137 | c, // Drop target |
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138 | javax.swing.BorderFactory.createMatteBorder(2, 2, 2, 2, defaultBorderColor), // Drag border |
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139 | recursive, // Recursive |
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140 | listener); |
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141 | } // end constructor |
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142 | |
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143 | /** |
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144 | * Constructor with a specified border |
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145 | * |
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146 | * @param c Component on which files will be dropped. |
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147 | * @param dragBorder Border to use on <tt>JComponent</tt> when dragging occurs. |
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148 | * @param listener Listens for <tt>filesDropped</tt>. |
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149 | * @since 1.0 |
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150 | */ |
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151 | public FileDrop(final java.awt.Component c, final javax.swing.border.Border dragBorder, final Listener listener) { |
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152 | this(null, // Logging stream |
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153 | c, // Drop target |
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154 | dragBorder, // Drag border |
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155 | false, // Recursive |
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156 | listener); |
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157 | } // end constructor |
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158 | |
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159 | /** |
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160 | * Constructor with a specified border and the option to recursively set drop targets. |
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161 | * If your component is a <tt>java.awt.Container</tt>, then each of its children |
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162 | * components will also listen for drops, though only the parent will change borders. |
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163 | * |
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164 | * @param c Component on which files will be dropped. |
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165 | * @param dragBorder Border to use on <tt>JComponent</tt> when dragging occurs. |
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166 | * @param recursive Recursively set children as drop targets. |
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167 | * @param listener Listens for <tt>filesDropped</tt>. |
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168 | * @since 1.0 |
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169 | */ |
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170 | public FileDrop(final java.awt.Component c, final javax.swing.border.Border dragBorder, final boolean recursive, |
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171 | final Listener listener) { |
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172 | this(null, c, dragBorder, recursive, listener); |
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173 | } // end constructor |
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174 | |
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175 | /** |
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176 | * Constructor with a specified border and debugging optionally turned on. |
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177 | * With Debugging turned on, more status messages will be displayed to |
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178 | * <tt>out</tt>. A common way to use this constructor is with |
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179 | * <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for |
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180 | * the parameter <tt>out</tt> will result in no debugging output. |
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181 | * |
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182 | * @param out PrintStream to record debugging info or null for no debugging. |
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183 | * @param c Component on which files will be dropped. |
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184 | * @param dragBorder Border to use on <tt>JComponent</tt> when dragging occurs. |
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185 | * @param listener Listens for <tt>filesDropped</tt>. |
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186 | * @since 1.0 |
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187 | */ |
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188 | public FileDrop(final java.io.PrintStream out, final java.awt.Component c, |
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189 | final javax.swing.border.Border dragBorder, final Listener listener) { |
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190 | this(out, // Logging stream |
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191 | c, // Drop target |
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192 | dragBorder, // Drag border |
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193 | false, // Recursive |
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194 | listener); |
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195 | } // end constructor |
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196 | |
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197 | /** |
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198 | * Full constructor with a specified border and debugging optionally turned on. |
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199 | * With Debugging turned on, more status messages will be displayed to |
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200 | * <tt>out</tt>. A common way to use this constructor is with |
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201 | * <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for |
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202 | * the parameter <tt>out</tt> will result in no debugging output. |
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203 | * |
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204 | * @param out PrintStream to record debugging info or null for no debugging. |
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205 | * @param c Component on which files will be dropped. |
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206 | * @param dragBorder Border to use on <tt>JComponent</tt> when dragging occurs. |
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207 | * @param recursive Recursively set children as drop targets. |
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208 | * @param listener Listens for <tt>filesDropped</tt>. |
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209 | * @since 1.0 |
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210 | */ |
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211 | public FileDrop(final java.io.PrintStream out, final java.awt.Component c, |
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212 | final javax.swing.border.Border dragBorder, final boolean recursive, final Listener listener) { |
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213 | |
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214 | if (supportsDnD()) { // Make a drop listener |
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215 | dropListener = new java.awt.dnd.DropTargetListener() { |
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216 | public void dragEnter(java.awt.dnd.DropTargetDragEvent evt) { |
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217 | |
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218 | // Is this an acceptable drag event? |
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219 | if (isDragOk(out, evt)) { |
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220 | // If it's a Swing component, set its border |
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221 | if (c instanceof javax.swing.JComponent) { |
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222 | javax.swing.JComponent jc = (javax.swing.JComponent) c; |
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223 | normalBorder = jc.getBorder(); |
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224 | jc.setBorder(dragBorder); |
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225 | } // end if: JComponent |
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226 | |
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227 | // Acknowledge that it's okay to enter |
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228 | //evt.acceptDrag( java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE ); |
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229 | evt.acceptDrag(java.awt.dnd.DnDConstants.ACTION_COPY); |
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230 | } // end if: drag ok |
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231 | else { // Reject the drag event |
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232 | evt.rejectDrag(); |
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233 | } // end else: drag not ok |
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234 | } // end dragEnter |
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235 | |
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236 | public void dragOver(java.awt.dnd.DropTargetDragEvent evt) { // This is called continually as long as the mouse is |
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237 | // over the drag target. |
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238 | } // end dragOver |
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239 | |
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240 | public void drop(java.awt.dnd.DropTargetDropEvent evt) { |
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241 | try { // Get whatever was dropped |
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242 | java.awt.datatransfer.Transferable tr = evt.getTransferable(); |
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243 | |
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244 | // Is it a file list? |
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245 | if (tr.isDataFlavorSupported(java.awt.datatransfer.DataFlavor.javaFileListFlavor)) { |
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246 | // Say we'll take it. |
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247 | //evt.acceptDrop ( java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE ); |
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248 | evt.acceptDrop(java.awt.dnd.DnDConstants.ACTION_COPY); |
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249 | |
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250 | // Get a useful list |
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251 | java.util.List fileList = (java.util.List) tr |
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252 | .getTransferData(java.awt.datatransfer.DataFlavor.javaFileListFlavor); |
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253 | java.util.Iterator iterator = fileList.iterator(); |
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254 | |
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255 | // Convert list to array |
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256 | java.io.File[] filesTemp = new java.io.File[fileList.size()]; |
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257 | fileList.toArray(filesTemp); |
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258 | final java.io.File[] files = filesTemp; |
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259 | |
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260 | // Alert listener to drop. |
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261 | if (listener != null) |
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262 | listener.filesDropped(files); |
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263 | |
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264 | // Mark that drop is completed. |
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265 | evt.getDropTargetContext().dropComplete(true); |
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266 | } // end if: file list |
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267 | else // this section will check for a reader flavor. |
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268 | { |
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269 | // Thanks, Nathan! |
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270 | // BEGIN 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added. |
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271 | DataFlavor[] flavors = tr.getTransferDataFlavors(); |
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272 | boolean handled = false; |
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273 | for (int zz = 0; zz < flavors.length; zz++) { |
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274 | if (flavors[zz].isRepresentationClassReader()) { |
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275 | // Say we'll take it. |
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276 | //evt.acceptDrop ( java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE ); |
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277 | evt.acceptDrop(java.awt.dnd.DnDConstants.ACTION_COPY); |
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278 | |
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279 | Reader reader = flavors[zz].getReaderForText(tr); |
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280 | |
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281 | BufferedReader br = new BufferedReader(reader); |
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282 | |
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283 | if (listener != null) |
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284 | listener.filesDropped(createFileArray(br, out)); |
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285 | |
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286 | // Mark that drop is completed. |
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287 | evt.getDropTargetContext().dropComplete(true); |
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288 | handled = true; |
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289 | break; |
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290 | } |
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291 | } |
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292 | if (!handled) { |
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293 | evt.rejectDrop(); |
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294 | } |
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295 | // END 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added. |
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296 | } // end else: not a file list |
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297 | } // end try |
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298 | catch (java.io.IOException io) { |
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299 | io.printStackTrace(out); |
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300 | evt.rejectDrop(); |
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301 | } // end catch IOException |
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302 | catch (java.awt.datatransfer.UnsupportedFlavorException ufe) { |
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303 | ufe.printStackTrace(out); |
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304 | evt.rejectDrop(); |
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305 | } // end catch: UnsupportedFlavorException |
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306 | finally { |
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307 | // If it's a Swing component, reset its border |
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308 | if (c instanceof javax.swing.JComponent) { |
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309 | javax.swing.JComponent jc = (javax.swing.JComponent) c; |
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310 | jc.setBorder(normalBorder); |
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311 | } // end if: JComponent |
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312 | } // end finally |
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313 | } // end drop |
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314 | |
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315 | public void dragExit(java.awt.dnd.DropTargetEvent evt) { |
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316 | // If it's a Swing component, reset its border |
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317 | if (c instanceof javax.swing.JComponent) { |
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318 | javax.swing.JComponent jc = (javax.swing.JComponent) c; |
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319 | jc.setBorder(normalBorder); |
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320 | } // end if: JComponent |
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321 | } // end dragExit |
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322 | |
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323 | public void dropActionChanged(java.awt.dnd.DropTargetDragEvent evt) { |
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324 | // Is this an acceptable drag event? |
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325 | if (isDragOk(out, evt)) { //evt.acceptDrag( java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE ); |
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326 | evt.acceptDrag(java.awt.dnd.DnDConstants.ACTION_COPY); |
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327 | } // end if: drag ok |
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328 | else { |
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329 | evt.rejectDrag(); |
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330 | } // end else: drag not ok |
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331 | } // end dropActionChanged |
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332 | }; // end DropTargetListener |
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333 | |
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334 | // Make the component (and possibly children) drop targets |
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335 | makeDropTarget(out, c, recursive); |
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336 | } // end if: supports dnd |
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337 | else { |
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338 | } // end else: does not support DnD |
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339 | } // end constructor |
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340 | |
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341 | private static boolean supportsDnD() { // Static Boolean |
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342 | if (supportsDnD == null) { |
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343 | boolean support = false; |
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344 | try { |
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345 | Class arbitraryDndClass = Class.forName("java.awt.dnd.DnDConstants"); |
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346 | support = true; |
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347 | } // end try |
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348 | catch (Exception e) { |
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349 | support = false; |
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350 | } // end catch |
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351 | supportsDnD = new Boolean(support); |
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352 | } // end if: first time through |
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353 | return supportsDnD.booleanValue(); |
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354 | } // end supportsDnD |
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355 | |
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356 | // BEGIN 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added. |
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357 | private static String ZERO_CHAR_STRING = "" + (char) 0; |
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358 | |
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359 | private static File[] createFileArray(BufferedReader bReader, PrintStream out) { |
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360 | try { |
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361 | java.util.List list = new java.util.ArrayList(); |
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362 | java.lang.String line = null; |
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363 | while ((line = bReader.readLine()) != null) { |
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364 | try { |
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365 | // kde seems to append a 0 char to the end of the reader |
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366 | if (ZERO_CHAR_STRING.equals(line)) |
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367 | continue; |
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368 | |
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369 | java.io.File file = new java.io.File(new java.net.URI(line)); |
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370 | list.add(file); |
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371 | } catch (Exception ex) { |
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372 | } |
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373 | } |
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374 | |
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375 | return (java.io.File[]) list.toArray(new File[list.size()]); |
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376 | } catch (IOException ex) { |
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377 | } |
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378 | return new File[0]; |
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379 | } |
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380 | |
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381 | // END 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added. |
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382 | |
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383 | private void makeDropTarget(final java.io.PrintStream out, final java.awt.Component c, boolean recursive) { |
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384 | // Make drop target |
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385 | final java.awt.dnd.DropTarget dt = new java.awt.dnd.DropTarget(); |
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386 | try { |
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387 | dt.addDropTargetListener(dropListener); |
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388 | } // end try |
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389 | catch (java.util.TooManyListenersException e) { |
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390 | e.printStackTrace(); |
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391 | } // end catch |
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392 | |
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393 | // Listen for hierarchy changes and remove the drop target when the parent gets cleared out. |
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394 | c.addHierarchyListener(new java.awt.event.HierarchyListener() { |
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395 | public void hierarchyChanged(java.awt.event.HierarchyEvent evt) { |
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396 | java.awt.Component parent = c.getParent(); |
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397 | if (parent == null) { |
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398 | c.setDropTarget(null); |
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399 | } // end if: null parent |
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400 | else { |
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401 | new java.awt.dnd.DropTarget(c, dropListener); |
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402 | } // end else: parent not null |
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403 | } // end hierarchyChanged |
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404 | }); // end hierarchy listener |
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405 | if (c.getParent() != null) |
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406 | new java.awt.dnd.DropTarget(c, dropListener); |
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407 | |
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408 | if (recursive && (c instanceof java.awt.Container)) { |
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409 | // Get the container |
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410 | java.awt.Container cont = (java.awt.Container) c; |
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411 | |
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412 | // Get it's components |
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413 | java.awt.Component[] comps = cont.getComponents(); |
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414 | |
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415 | // Set it's components as listeners also |
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416 | for (int i = 0; i < comps.length; i++) |
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417 | makeDropTarget(out, comps[i], recursive); |
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418 | } // end if: recursively set components as listener |
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419 | } // end dropListener |
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420 | |
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421 | /** Determine if the dragged data is a file list. */ |
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422 | private boolean isDragOk(final java.io.PrintStream out, final java.awt.dnd.DropTargetDragEvent evt) { |
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423 | boolean ok = false; |
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424 | |
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425 | // Get data flavors being dragged |
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426 | java.awt.datatransfer.DataFlavor[] flavors = evt.getCurrentDataFlavors(); |
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427 | |
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428 | // See if any of the flavors are a file list |
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429 | int i = 0; |
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430 | while (!ok && i < flavors.length) { |
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431 | // BEGIN 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added. |
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432 | // Is the flavor a file list? |
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433 | final DataFlavor curFlavor = flavors[i]; |
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434 | if (curFlavor.equals(java.awt.datatransfer.DataFlavor.javaFileListFlavor) |
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435 | || curFlavor.isRepresentationClassReader()) { |
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436 | ok = true; |
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437 | } |
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438 | // END 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added. |
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439 | i++; |
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440 | } // end while: through flavors |
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441 | |
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442 | return ok; |
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443 | } // end isDragOk |
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444 | |
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445 | /** |
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446 | * Removes the drag-and-drop hooks from the component and optionally |
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447 | * from the all children. You should call this if you add and remove |
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448 | * components after you've set up the drag-and-drop. |
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449 | * This will recursively unregister all components contained within |
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450 | * <var>c</var> if <var>c</var> is a {@link java.awt.Container}. |
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451 | * |
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452 | * @param c The component to unregister as a drop target |
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453 | * @since 1.0 |
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454 | */ |
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455 | public static boolean remove(java.awt.Component c) { |
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456 | return remove(null, c, true); |
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457 | } // end remove |
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458 | |
---|
459 | /** |
---|
460 | * Removes the drag-and-drop hooks from the component and optionally |
---|
461 | * from the all children. You should call this if you add and remove |
---|
462 | * components after you've set up the drag-and-drop. |
---|
463 | * |
---|
464 | * @param out Optional {@link java.io.PrintStream} for logging drag and drop messages |
---|
465 | * @param c The component to unregister |
---|
466 | * @param recursive Recursively unregister components within a container |
---|
467 | * @since 1.0 |
---|
468 | */ |
---|
469 | public static boolean remove(java.io.PrintStream out, java.awt.Component c, boolean recursive) { // Make sure we support dnd. |
---|
470 | if (supportsDnD()) { |
---|
471 | c.setDropTarget(null); |
---|
472 | if (recursive && (c instanceof java.awt.Container)) { |
---|
473 | java.awt.Component[] comps = ((java.awt.Container) c).getComponents(); |
---|
474 | for (int i = 0; i < comps.length; i++) |
---|
475 | remove(out, comps[i], recursive); |
---|
476 | return true; |
---|
477 | } // end if: recursive |
---|
478 | else |
---|
479 | return false; |
---|
480 | } // end if: supports DnD |
---|
481 | else |
---|
482 | return false; |
---|
483 | } // end remove |
---|
484 | |
---|
485 | /* ******** I N N E R I N T E R F A C E L I S T E N E R ******** */ |
---|
486 | |
---|
487 | /** |
---|
488 | * Implement this inner interface to listen for when files are dropped. For example |
---|
489 | * your class declaration may begin like this: |
---|
490 | * <code><pre> |
---|
491 | * public class MyClass implements FileDrop.Listener |
---|
492 | * ... |
---|
493 | * public void filesDropped( java.io.File[] files ) |
---|
494 | * { |
---|
495 | * ... |
---|
496 | * } // end filesDropped |
---|
497 | * ... |
---|
498 | * </pre></code> |
---|
499 | * |
---|
500 | * @since 1.1 |
---|
501 | */ |
---|
502 | public static interface Listener { |
---|
503 | |
---|
504 | /** |
---|
505 | * This method is called when files have been successfully dropped. |
---|
506 | * |
---|
507 | * @param files An array of <tt>File</tt>s that were dropped. |
---|
508 | * @since 1.0 |
---|
509 | */ |
---|
510 | public abstract void filesDropped(java.io.File[] files); |
---|
511 | |
---|
512 | } // end inner-interface Listener |
---|
513 | |
---|
514 | /* ******** I N N E R C L A S S ******** */ |
---|
515 | |
---|
516 | /** |
---|
517 | * This is the event that is passed to the |
---|
518 | * {@link FileDropListener#filesDropped filesDropped(...)} method in |
---|
519 | * your {@link FileDropListener} when files are dropped onto |
---|
520 | * a registered drop target. |
---|
521 | * |
---|
522 | * <p>I'm releasing this code into the Public Domain. Enjoy.</p> |
---|
523 | * |
---|
524 | * @author Robert Harder |
---|
525 | * @author rob@iharder.net |
---|
526 | * @version 1.2 |
---|
527 | */ |
---|
528 | public static class Event extends java.util.EventObject { |
---|
529 | |
---|
530 | private java.io.File[] files; |
---|
531 | |
---|
532 | /** |
---|
533 | * Constructs an {@link Event} with the array |
---|
534 | * of files that were dropped and the |
---|
535 | * {@link FileDrop} that initiated the event. |
---|
536 | * |
---|
537 | * @param files The array of files that were dropped |
---|
538 | * @source The event source |
---|
539 | * @since 1.1 |
---|
540 | */ |
---|
541 | public Event(java.io.File[] files, Object source) { |
---|
542 | super(source); |
---|
543 | this.files = files; |
---|
544 | } // end constructor |
---|
545 | |
---|
546 | /** |
---|
547 | * Returns an array of files that were dropped on a |
---|
548 | * registered drop target. |
---|
549 | * |
---|
550 | * @return array of files that were dropped |
---|
551 | * @since 1.1 |
---|
552 | */ |
---|
553 | public java.io.File[] getFiles() { |
---|
554 | return files; |
---|
555 | } // end getFiles |
---|
556 | |
---|
557 | } // end inner class Event |
---|
558 | |
---|
559 | /* ******** I N N E R C L A S S ******** */ |
---|
560 | |
---|
561 | /** |
---|
562 | * At last an easy way to encapsulate your custom objects for dragging and dropping |
---|
563 | * in your Java programs! |
---|
564 | * When you need to create a {@link java.awt.datatransfer.Transferable} object, |
---|
565 | * use this class to wrap your object. |
---|
566 | * For example: |
---|
567 | * <pre><code> |
---|
568 | * ... |
---|
569 | * MyCoolClass myObj = new MyCoolClass(); |
---|
570 | * Transferable xfer = new TransferableObject( myObj ); |
---|
571 | * ... |
---|
572 | * </code></pre> |
---|
573 | * Or if you need to know when the data was actually dropped, like when you're |
---|
574 | * moving data out of a list, say, you can use the {@link TransferableObject.Fetcher} |
---|
575 | * inner class to return your object Just in Time. |
---|
576 | * For example: |
---|
577 | * <pre><code> |
---|
578 | * ... |
---|
579 | * final MyCoolClass myObj = new MyCoolClass(); |
---|
580 | * |
---|
581 | * TransferableObject.Fetcher fetcher = new TransferableObject.Fetcher() |
---|
582 | * { public Object getObject(){ return myObj; } |
---|
583 | * }; // end fetcher |
---|
584 | * |
---|
585 | * Transferable xfer = new TransferableObject( fetcher ); |
---|
586 | * ... |
---|
587 | * </code></pre> |
---|
588 | * |
---|
589 | * The {@link java.awt.datatransfer.DataFlavor} associated with |
---|
590 | * {@link TransferableObject} has the representation class |
---|
591 | * <tt>net.iharder.dnd.TransferableObject.class</tt> and MIME type |
---|
592 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>. |
---|
593 | * This data flavor is accessible via the static |
---|
594 | * {@link #DATA_FLAVOR} property. |
---|
595 | * |
---|
596 | * |
---|
597 | * <p>I'm releasing this code into the Public Domain. Enjoy.</p> |
---|
598 | * |
---|
599 | * @author Robert Harder |
---|
600 | * @author rob@iharder.net |
---|
601 | * @version 1.2 |
---|
602 | */ |
---|
603 | public static class TransferableObject implements java.awt.datatransfer.Transferable { |
---|
604 | /** |
---|
605 | * The MIME type for {@link #DATA_FLAVOR} is |
---|
606 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>. |
---|
607 | * |
---|
608 | * @since 1.1 |
---|
609 | */ |
---|
610 | public final static String MIME_TYPE = "application/x-net.iharder.dnd.TransferableObject"; |
---|
611 | |
---|
612 | /** |
---|
613 | * The default {@link java.awt.datatransfer.DataFlavor} for |
---|
614 | * {@link TransferableObject} has the representation class |
---|
615 | * <tt>net.iharder.dnd.TransferableObject.class</tt> |
---|
616 | * and the MIME type |
---|
617 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>. |
---|
618 | * |
---|
619 | * @since 1.1 |
---|
620 | */ |
---|
621 | public final static java.awt.datatransfer.DataFlavor DATA_FLAVOR = new java.awt.datatransfer.DataFlavor( |
---|
622 | FileDrop.TransferableObject.class, MIME_TYPE); |
---|
623 | |
---|
624 | private Fetcher fetcher; |
---|
625 | private Object data; |
---|
626 | |
---|
627 | private java.awt.datatransfer.DataFlavor customFlavor; |
---|
628 | |
---|
629 | /** |
---|
630 | * Creates a new {@link TransferableObject} that wraps <var>data</var>. |
---|
631 | * Along with the {@link #DATA_FLAVOR} associated with this class, |
---|
632 | * this creates a custom data flavor with a representation class |
---|
633 | * determined from <code>data.getClass()</code> and the MIME type |
---|
634 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>. |
---|
635 | * |
---|
636 | * @param data The data to transfer |
---|
637 | * @since 1.1 |
---|
638 | */ |
---|
639 | public TransferableObject(Object data) { |
---|
640 | this.data = data; |
---|
641 | this.customFlavor = new java.awt.datatransfer.DataFlavor(data.getClass(), MIME_TYPE); |
---|
642 | } // end constructor |
---|
643 | |
---|
644 | /** |
---|
645 | * Creates a new {@link TransferableObject} that will return the |
---|
646 | * object that is returned by <var>fetcher</var>. |
---|
647 | * No custom data flavor is set other than the default |
---|
648 | * {@link #DATA_FLAVOR}. |
---|
649 | * |
---|
650 | * @see Fetcher |
---|
651 | * @param fetcher The {@link Fetcher} that will return the data object |
---|
652 | * @since 1.1 |
---|
653 | */ |
---|
654 | public TransferableObject(Fetcher fetcher) { |
---|
655 | this.fetcher = fetcher; |
---|
656 | } // end constructor |
---|
657 | |
---|
658 | /** |
---|
659 | * Creates a new {@link TransferableObject} that will return the |
---|
660 | * object that is returned by <var>fetcher</var>. |
---|
661 | * Along with the {@link #DATA_FLAVOR} associated with this class, |
---|
662 | * this creates a custom data flavor with a representation class <var>dataClass</var> |
---|
663 | * and the MIME type |
---|
664 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>. |
---|
665 | * |
---|
666 | * @see Fetcher |
---|
667 | * @param dataClass The {@link java.lang.Class} to use in the custom data flavor |
---|
668 | * @param fetcher The {@link Fetcher} that will return the data object |
---|
669 | * @since 1.1 |
---|
670 | */ |
---|
671 | public TransferableObject(Class dataClass, Fetcher fetcher) { |
---|
672 | this.fetcher = fetcher; |
---|
673 | this.customFlavor = new java.awt.datatransfer.DataFlavor(dataClass, MIME_TYPE); |
---|
674 | } // end constructor |
---|
675 | |
---|
676 | /** |
---|
677 | * Returns the custom {@link java.awt.datatransfer.DataFlavor} associated |
---|
678 | * with the encapsulated object or <tt>null</tt> if the {@link Fetcher} |
---|
679 | * constructor was used without passing a {@link java.lang.Class}. |
---|
680 | * |
---|
681 | * @return The custom data flavor for the encapsulated object |
---|
682 | * @since 1.1 |
---|
683 | */ |
---|
684 | public java.awt.datatransfer.DataFlavor getCustomDataFlavor() { |
---|
685 | return customFlavor; |
---|
686 | } // end getCustomDataFlavor |
---|
687 | |
---|
688 | /* ******** T R A N S F E R A B L E M E T H O D S ******** */ |
---|
689 | |
---|
690 | /** |
---|
691 | * Returns a two- or three-element array containing first |
---|
692 | * the custom data flavor, if one was created in the constructors, |
---|
693 | * second the default {@link #DATA_FLAVOR} associated with |
---|
694 | * {@link TransferableObject}, and third the |
---|
695 | * {@link java.awt.datatransfer.DataFlavor.stringFlavor}. |
---|
696 | * |
---|
697 | * @return An array of supported data flavors |
---|
698 | * @since 1.1 |
---|
699 | */ |
---|
700 | public java.awt.datatransfer.DataFlavor[] getTransferDataFlavors() { |
---|
701 | if (customFlavor != null) |
---|
702 | return new java.awt.datatransfer.DataFlavor[] { customFlavor, DATA_FLAVOR, |
---|
703 | java.awt.datatransfer.DataFlavor.stringFlavor }; // end flavors array |
---|
704 | else |
---|
705 | return new java.awt.datatransfer.DataFlavor[] { DATA_FLAVOR, |
---|
706 | java.awt.datatransfer.DataFlavor.stringFlavor }; // end flavors array |
---|
707 | } // end getTransferDataFlavors |
---|
708 | |
---|
709 | /** |
---|
710 | * Returns the data encapsulated in this {@link TransferableObject}. |
---|
711 | * If the {@link Fetcher} constructor was used, then this is when |
---|
712 | * the {@link Fetcher#getObject getObject()} method will be called. |
---|
713 | * If the requested data flavor is not supported, then the |
---|
714 | * {@link Fetcher#getObject getObject()} method will not be called. |
---|
715 | * |
---|
716 | * @param flavor The data flavor for the data to return |
---|
717 | * @return The dropped data |
---|
718 | * @since 1.1 |
---|
719 | */ |
---|
720 | public Object getTransferData(java.awt.datatransfer.DataFlavor flavor) |
---|
721 | throws java.awt.datatransfer.UnsupportedFlavorException, java.io.IOException { |
---|
722 | // Native object |
---|
723 | if (flavor.equals(DATA_FLAVOR)) |
---|
724 | return fetcher == null ? data : fetcher.getObject(); |
---|
725 | |
---|
726 | // String |
---|
727 | if (flavor.equals(java.awt.datatransfer.DataFlavor.stringFlavor)) |
---|
728 | return fetcher == null ? data.toString() : fetcher.getObject().toString(); |
---|
729 | |
---|
730 | // We can't do anything else |
---|
731 | throw new java.awt.datatransfer.UnsupportedFlavorException(flavor); |
---|
732 | } // end getTransferData |
---|
733 | |
---|
734 | /** |
---|
735 | * Returns <tt>true</tt> if <var>flavor</var> is one of the supported |
---|
736 | * flavors. Flavors are supported using the <code>equals(...)</code> method. |
---|
737 | * |
---|
738 | * @param flavor The data flavor to check |
---|
739 | * @return Whether or not the flavor is supported |
---|
740 | * @since 1.1 |
---|
741 | */ |
---|
742 | public boolean isDataFlavorSupported(java.awt.datatransfer.DataFlavor flavor) { |
---|
743 | // Native object |
---|
744 | if (flavor.equals(DATA_FLAVOR)) |
---|
745 | return true; |
---|
746 | |
---|
747 | // String |
---|
748 | if (flavor.equals(java.awt.datatransfer.DataFlavor.stringFlavor)) |
---|
749 | return true; |
---|
750 | |
---|
751 | // We can't do anything else |
---|
752 | return false; |
---|
753 | } // end isDataFlavorSupported |
---|
754 | |
---|
755 | /* ******** I N N E R I N T E R F A C E F E T C H E R ******** */ |
---|
756 | |
---|
757 | /** |
---|
758 | * Instead of passing your data directly to the {@link TransferableObject} |
---|
759 | * constructor, you may want to know exactly when your data was received |
---|
760 | * in case you need to remove it from its source (or do anyting else to it). |
---|
761 | * When the {@link #getTransferData getTransferData(...)} method is called |
---|
762 | * on the {@link TransferableObject}, the {@link Fetcher}'s |
---|
763 | * {@link #getObject getObject()} method will be called. |
---|
764 | * |
---|
765 | * @author Robert Harder |
---|
766 | * @copyright 2001 |
---|
767 | * @version 1.1 |
---|
768 | * @since 1.1 |
---|
769 | */ |
---|
770 | public static interface Fetcher { |
---|
771 | /** |
---|
772 | * Return the object being encapsulated in the |
---|
773 | * {@link TransferableObject}. |
---|
774 | * |
---|
775 | * @return The dropped object |
---|
776 | * @since 1.1 |
---|
777 | */ |
---|
778 | public abstract Object getObject(); |
---|
779 | } // end inner interface Fetcher |
---|
780 | |
---|
781 | } // end class TransferableObject |
---|
782 | |
---|
783 | } // end class FileDrop |
---|