1 | /* code from: http://iharder.sourceforge.net/current/java/filedrop/
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2 | (public domain) with only very small additions */
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3 | package org.openstreetmap.josm.gui;
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4 |
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5 | import java.awt.datatransfer.DataFlavor;
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6 | import java.io.BufferedReader;
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7 | import java.io.File;
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8 | import java.io.IOException;
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9 | import java.io.PrintStream;
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10 | import java.io.Reader;
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11 |
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12 | import org.openstreetmap.josm.actions.OpenFileAction;
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13 |
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14 | /**
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15 | * This class makes it easy to drag and drop files from the operating
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16 | * system to a Java program. Any <tt>java.awt.Component</tt> can be
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17 | * dropped onto, but only <tt>javax.swing.JComponent</tt>s will indicate
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18 | * the drop event with a changed border.
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19 | * <p/>
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20 | * To use this class, construct a new <tt>FileDrop</tt> by passing
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21 | * it the target component and a <tt>Listener</tt> to receive notification
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22 | * when file(s) have been dropped. Here is an example:
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23 | * <p/>
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24 | * <code><pre>
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25 | * JPanel myPanel = new JPanel();
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26 | * new FileDrop( myPanel, new FileDrop.Listener()
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27 | * { public void filesDropped( java.io.File[] files )
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28 | * {
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29 | * // handle file drop
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30 | * ...
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31 | * } // end filesDropped
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32 | * }); // end FileDrop.Listener
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33 | * </pre></code>
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34 | * <p/>
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35 | * You can specify the border that will appear when files are being dragged by
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36 | * calling the constructor with a <tt>javax.swing.border.Border</tt>. Only
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37 | * <tt>JComponent</tt>s will show any indication with a border.
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38 | * <p/>
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39 | * You can turn on some debugging features by passing a <tt>PrintStream</tt>
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40 | * object (such as <tt>System.out</tt>) into the full constructor. A <tt>null</tt>
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41 | * value will result in no extra debugging information being output.
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42 | * <p/>
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43 | *
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44 | * <p>I'm releasing this code into the Public Domain. Enjoy.
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45 | * </p>
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46 | * <p><em>Original author: Robert Harder, rharder@usa.net</em></p>
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47 | * <p>2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.</p>
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48 | *
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49 | * @author Robert Harder
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50 | * @author rharder@users.sf.net
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51 | * @version 1.0.1
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52 | */
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53 | public class FileDrop
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54 | {
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55 | private transient javax.swing.border.Border normalBorder;
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56 | private transient java.awt.dnd.DropTargetListener dropListener;
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57 |
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58 |
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59 | /** Discover if the running JVM is modern enough to have drag and drop. */
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60 | private static Boolean supportsDnD;
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61 |
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62 | // Default border color
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63 | private static java.awt.Color defaultBorderColor = new java.awt.Color( 0f, 0f, 1f, 0.25f );
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64 |
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65 |
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66 | /* Constructor for JOSM file drop */
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67 | public FileDrop(final java.awt.Component c)
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68 | { this(
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69 | null, // Logging stream
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70 | c, // Drop target
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71 | javax.swing.BorderFactory.createMatteBorder( 2, 2, 2, 2, defaultBorderColor ), // Drag border
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72 | true, // Recursive
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73 | new FileDrop.Listener()
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74 | {
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75 | public void filesDropped( java.io.File[] files )
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76 | {
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77 | OpenFileAction ofa = new OpenFileAction();
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78 | for( int i = 0; i < files.length; i++ )
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79 | {
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80 | ofa.openFile(files[i]);
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81 | } // end for: through each dropped file
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82 | } // end filesDropped
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83 | }); // end FileDrop.Listener
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84 | }
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85 |
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86 |
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87 | /**
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88 | * Constructs a {@link FileDrop} with a default light-blue border
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89 | * and, if <var>c</var> is a {@link java.awt.Container}, recursively
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90 | * sets all elements contained within as drop targets, though only
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91 | * the top level container will change borders.
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92 | *
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93 | * @param c Component on which files will be dropped.
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94 | * @param listener Listens for <tt>filesDropped</tt>.
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95 | * @since 1.0
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96 | */
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97 | public FileDrop(
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98 | final java.awt.Component c,
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99 | final Listener listener )
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100 | { this( null, // Logging stream
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101 | c, // Drop target
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102 | javax.swing.BorderFactory.createMatteBorder( 2, 2, 2, 2, defaultBorderColor ), // Drag border
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103 | true, // Recursive
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104 | listener );
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105 | } // end constructor
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106 |
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107 |
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108 |
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109 |
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110 | /**
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111 | * Constructor with a default border and the option to recursively set drop targets.
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112 | * If your component is a <tt>java.awt.Container</tt>, then each of its children
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113 | * components will also listen for drops, though only the parent will change borders.
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114 | *
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115 | * @param c Component on which files will be dropped.
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116 | * @param recursive Recursively set children as drop targets.
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117 | * @param listener Listens for <tt>filesDropped</tt>.
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118 | * @since 1.0
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119 | */
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120 | public FileDrop(
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121 | final java.awt.Component c,
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122 | final boolean recursive,
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123 | final Listener listener )
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124 | { this( null, // Logging stream
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125 | c, // Drop target
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126 | javax.swing.BorderFactory.createMatteBorder( 2, 2, 2, 2, defaultBorderColor ), // Drag border
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127 | recursive, // Recursive
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128 | listener );
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129 | } // end constructor
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130 |
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131 |
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132 | /**
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133 | * Constructor with a default border and debugging optionally turned on.
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134 | * With Debugging turned on, more status messages will be displayed to
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135 | * <tt>out</tt>. A common way to use this constructor is with
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136 | * <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for
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137 | * the parameter <tt>out</tt> will result in no debugging output.
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138 | *
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139 | * @param out PrintStream to record debugging info or null for no debugging.
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140 | * @param out
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141 | * @param c Component on which files will be dropped.
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142 | * @param listener Listens for <tt>filesDropped</tt>.
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143 | * @since 1.0
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144 | */
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145 | public FileDrop(
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146 | final java.io.PrintStream out,
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147 | final java.awt.Component c,
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148 | final Listener listener )
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149 | { this( out, // Logging stream
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150 | c, // Drop target
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151 | javax.swing.BorderFactory.createMatteBorder( 2, 2, 2, 2, defaultBorderColor ),
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152 | false, // Recursive
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153 | listener );
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154 | } // end constructor
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155 |
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156 |
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157 |
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158 | /**
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159 | * Constructor with a default border, debugging optionally turned on
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160 | * 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 | * With Debugging turned on, more status messages will be displayed to
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164 | * <tt>out</tt>. A common way to use this constructor is with
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165 | * <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for
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166 | * the parameter <tt>out</tt> will result in no debugging output.
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167 | *
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168 | * @param out PrintStream to record debugging info or null for no debugging.
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169 | * @param out
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170 | * @param c Component on which files will be dropped.
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171 | * @param recursive Recursively set children as drop targets.
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172 | * @param listener Listens for <tt>filesDropped</tt>.
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173 | * @since 1.0
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174 | */
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175 | public FileDrop(
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176 | final java.io.PrintStream out,
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177 | final java.awt.Component c,
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178 | final boolean recursive,
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179 | final Listener listener)
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180 | { this( out, // Logging stream
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181 | c, // Drop target
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182 | javax.swing.BorderFactory.createMatteBorder( 2, 2, 2, 2, defaultBorderColor ), // Drag border
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183 | recursive, // Recursive
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184 | listener );
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185 | } // end constructor
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186 |
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187 |
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188 |
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189 |
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190 | /**
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191 | * Constructor with a specified border
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192 | *
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193 | * @param c Component on which files will be dropped.
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194 | * @param dragBorder Border to use on <tt>JComponent</tt> when dragging occurs.
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195 | * @param listener Listens for <tt>filesDropped</tt>.
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196 | * @since 1.0
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197 | */
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198 | public FileDrop(
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199 | final java.awt.Component c,
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200 | final javax.swing.border.Border dragBorder,
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201 | final Listener listener)
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202 | { this(
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203 | null, // Logging stream
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204 | c, // Drop target
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205 | dragBorder, // Drag border
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206 | false, // Recursive
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207 | listener );
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208 | } // end constructor
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209 |
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210 |
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211 |
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212 |
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213 | /**
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214 | * Constructor with a specified border and the option to recursively set drop targets.
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215 | * If your component is a <tt>java.awt.Container</tt>, then each of its children
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216 | * components will also listen for drops, though only the parent will change borders.
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217 | *
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218 | * @param c Component on which files will be dropped.
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219 | * @param dragBorder Border to use on <tt>JComponent</tt> when dragging occurs.
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220 | * @param recursive Recursively set children as drop targets.
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221 | * @param listener Listens for <tt>filesDropped</tt>.
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222 | * @since 1.0
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223 | */
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224 | public FileDrop(
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225 | final java.awt.Component c,
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226 | final javax.swing.border.Border dragBorder,
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227 | final boolean recursive,
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228 | final Listener listener)
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229 | { this(
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230 | null,
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231 | c,
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232 | dragBorder,
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233 | recursive,
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234 | listener );
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235 | } // end constructor
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236 |
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237 |
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238 |
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239 | /**
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240 | * Constructor with a specified border and debugging optionally turned on.
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241 | * With Debugging turned on, more status messages will be displayed to
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242 | * <tt>out</tt>. A common way to use this constructor is with
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243 | * <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for
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244 | * the parameter <tt>out</tt> will result in no debugging output.
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245 | *
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246 | * @param out PrintStream to record debugging info or null for no debugging.
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247 | * @param c Component on which files will be dropped.
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248 | * @param dragBorder Border to use on <tt>JComponent</tt> when dragging occurs.
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249 | * @param listener Listens for <tt>filesDropped</tt>.
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250 | * @since 1.0
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251 | */
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252 | public FileDrop(
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253 | final java.io.PrintStream out,
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254 | final java.awt.Component c,
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255 | final javax.swing.border.Border dragBorder,
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256 | final Listener listener)
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257 | { this(
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258 | out, // Logging stream
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259 | c, // Drop target
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260 | dragBorder, // Drag border
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261 | false, // Recursive
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262 | listener );
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263 | } // end constructor
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264 |
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265 |
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266 |
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267 |
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268 |
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269 | /**
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270 | * Full constructor with a specified border and debugging optionally turned on.
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271 | * With Debugging turned on, more status messages will be displayed to
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272 | * <tt>out</tt>. A common way to use this constructor is with
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273 | * <tt>System.out</tt> or <tt>System.err</tt>. A <tt>null</tt> value for
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274 | * the parameter <tt>out</tt> will result in no debugging output.
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275 | *
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276 | * @param out PrintStream to record debugging info or null for no debugging.
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277 | * @param c Component on which files will be dropped.
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278 | * @param dragBorder Border to use on <tt>JComponent</tt> when dragging occurs.
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279 | * @param recursive Recursively set children as drop targets.
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280 | * @param listener Listens for <tt>filesDropped</tt>.
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281 | * @since 1.0
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282 | */
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283 | public FileDrop(
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284 | final java.io.PrintStream out,
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285 | final java.awt.Component c,
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286 | final javax.swing.border.Border dragBorder,
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287 | final boolean recursive,
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288 | final Listener listener)
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289 | {
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290 |
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291 | if( supportsDnD() )
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292 | { // Make a drop listener
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293 | dropListener = new java.awt.dnd.DropTargetListener()
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294 | { public void dragEnter( java.awt.dnd.DropTargetDragEvent evt )
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295 | { log( out, "FileDrop: dragEnter event." );
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296 |
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297 | // Is this an acceptable drag event?
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298 | if( isDragOk( out, evt ) )
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299 | {
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300 | // If it's a Swing component, set its border
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301 | if( c instanceof javax.swing.JComponent )
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302 | { javax.swing.JComponent jc = (javax.swing.JComponent) c;
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303 | normalBorder = jc.getBorder();
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304 | log( out, "FileDrop: normal border saved." );
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305 | jc.setBorder( dragBorder );
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306 | log( out, "FileDrop: drag border set." );
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307 | } // end if: JComponent
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308 |
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309 | // Acknowledge that it's okay to enter
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310 | //evt.acceptDrag( java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE );
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311 | evt.acceptDrag( java.awt.dnd.DnDConstants.ACTION_COPY );
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312 | log( out, "FileDrop: event accepted." );
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313 | } // end if: drag ok
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314 | else
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315 | { // Reject the drag event
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316 | evt.rejectDrag();
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317 | log( out, "FileDrop: event rejected." );
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318 | } // end else: drag not ok
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319 | } // end dragEnter
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320 |
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321 | public void dragOver( java.awt.dnd.DropTargetDragEvent evt )
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322 | { // This is called continually as long as the mouse is
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323 | // over the drag target.
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324 | } // end dragOver
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325 |
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326 | public void drop( java.awt.dnd.DropTargetDropEvent evt )
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327 | { log( out, "FileDrop: drop event." );
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328 | try
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329 | { // Get whatever was dropped
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330 | java.awt.datatransfer.Transferable tr = evt.getTransferable();
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331 |
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332 | // Is it a file list?
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333 | if (tr.isDataFlavorSupported (java.awt.datatransfer.DataFlavor.javaFileListFlavor))
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334 | {
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335 | // Say we'll take it.
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336 | //evt.acceptDrop ( java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE );
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337 | evt.acceptDrop ( java.awt.dnd.DnDConstants.ACTION_COPY );
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338 | log( out, "FileDrop: file list accepted." );
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339 |
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340 | // Get a useful list
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341 | java.util.List fileList = (java.util.List)
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342 | tr.getTransferData(java.awt.datatransfer.DataFlavor.javaFileListFlavor);
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343 | java.util.Iterator iterator = fileList.iterator();
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344 |
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345 | // Convert list to array
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346 | java.io.File[] filesTemp = new java.io.File[ fileList.size() ];
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347 | fileList.toArray( filesTemp );
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348 | final java.io.File[] files = filesTemp;
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349 |
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350 | // Alert listener to drop.
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351 | if( listener != null )
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352 | listener.filesDropped( files );
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353 |
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354 | // Mark that drop is completed.
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355 | evt.getDropTargetContext().dropComplete(true);
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356 | log( out, "FileDrop: drop complete." );
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357 | } // end if: file list
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358 | else // this section will check for a reader flavor.
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359 | {
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360 | // Thanks, Nathan!
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361 | // BEGIN 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.
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362 | DataFlavor[] flavors = tr.getTransferDataFlavors();
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363 | boolean handled = false;
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364 | for (int zz = 0; zz < flavors.length; zz++) {
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365 | if (flavors[zz].isRepresentationClassReader()) {
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366 | // Say we'll take it.
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367 | //evt.acceptDrop ( java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE );
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368 | evt.acceptDrop(java.awt.dnd.DnDConstants.ACTION_COPY);
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369 | log(out, "FileDrop: reader accepted.");
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370 |
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371 | Reader reader = flavors[zz].getReaderForText(tr);
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372 |
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373 | BufferedReader br = new BufferedReader(reader);
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374 |
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375 | if(listener != null)
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376 | listener.filesDropped(createFileArray(br, out));
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377 |
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378 | // Mark that drop is completed.
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379 | evt.getDropTargetContext().dropComplete(true);
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380 | log(out, "FileDrop: drop complete.");
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381 | handled = true;
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382 | break;
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383 | }
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384 | }
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385 | if(!handled){
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386 | log( out, "FileDrop: not a file list or reader - abort." );
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387 | evt.rejectDrop();
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388 | }
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389 | // END 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.
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390 | } // end else: not a file list
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391 | } // end try
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392 | catch ( java.io.IOException io)
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393 | { log( out, "FileDrop: IOException - abort:" );
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394 | io.printStackTrace( out );
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395 | evt.rejectDrop();
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396 | } // end catch IOException
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397 | catch (java.awt.datatransfer.UnsupportedFlavorException ufe)
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398 | { log( out, "FileDrop: UnsupportedFlavorException - abort:" );
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399 | ufe.printStackTrace( out );
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400 | evt.rejectDrop();
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401 | } // end catch: UnsupportedFlavorException
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402 | finally
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403 | {
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404 | // If it's a Swing component, reset its border
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405 | if( c instanceof javax.swing.JComponent )
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406 | { javax.swing.JComponent jc = (javax.swing.JComponent) c;
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407 | jc.setBorder( normalBorder );
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408 | log( out, "FileDrop: normal border restored." );
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409 | } // end if: JComponent
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410 | } // end finally
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411 | } // end drop
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412 |
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413 | public void dragExit( java.awt.dnd.DropTargetEvent evt )
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414 | { log( out, "FileDrop: dragExit event." );
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415 | // If it's a Swing component, reset its border
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416 | if( c instanceof javax.swing.JComponent )
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417 | { javax.swing.JComponent jc = (javax.swing.JComponent) c;
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418 | jc.setBorder( normalBorder );
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419 | log( out, "FileDrop: normal border restored." );
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420 | } // end if: JComponent
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421 | } // end dragExit
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422 |
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423 | public void dropActionChanged( java.awt.dnd.DropTargetDragEvent evt )
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424 | { log( out, "FileDrop: dropActionChanged event." );
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425 | // Is this an acceptable drag event?
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426 | if( isDragOk( out, evt ) )
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427 | { //evt.acceptDrag( java.awt.dnd.DnDConstants.ACTION_COPY_OR_MOVE );
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428 | evt.acceptDrag( java.awt.dnd.DnDConstants.ACTION_COPY );
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429 | log( out, "FileDrop: event accepted." );
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430 | } // end if: drag ok
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431 | else
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432 | { evt.rejectDrag();
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433 | log( out, "FileDrop: event rejected." );
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434 | } // end else: drag not ok
|
---|
435 | } // end dropActionChanged
|
---|
436 | }; // end DropTargetListener
|
---|
437 |
|
---|
438 | // Make the component (and possibly children) drop targets
|
---|
439 | makeDropTarget( out, c, recursive );
|
---|
440 | } // end if: supports dnd
|
---|
441 | else
|
---|
442 | { log( out, "FileDrop: Drag and drop is not supported with this JVM" );
|
---|
443 | } // end else: does not support DnD
|
---|
444 | } // end constructor
|
---|
445 |
|
---|
446 |
|
---|
447 | private static boolean supportsDnD()
|
---|
448 | { // Static Boolean
|
---|
449 | if( supportsDnD == null )
|
---|
450 | {
|
---|
451 | boolean support = false;
|
---|
452 | try
|
---|
453 | { Class arbitraryDndClass = Class.forName( "java.awt.dnd.DnDConstants" );
|
---|
454 | support = true;
|
---|
455 | } // end try
|
---|
456 | catch( Exception e )
|
---|
457 | { support = false;
|
---|
458 | } // end catch
|
---|
459 | supportsDnD = new Boolean( support );
|
---|
460 | } // end if: first time through
|
---|
461 | return supportsDnD.booleanValue();
|
---|
462 | } // end supportsDnD
|
---|
463 |
|
---|
464 |
|
---|
465 | // BEGIN 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.
|
---|
466 | private static String ZERO_CHAR_STRING = "" + (char)0;
|
---|
467 | private static File[] createFileArray(BufferedReader bReader, PrintStream out)
|
---|
468 | {
|
---|
469 | try {
|
---|
470 | java.util.List list = new java.util.ArrayList();
|
---|
471 | java.lang.String line = null;
|
---|
472 | while ((line = bReader.readLine()) != null) {
|
---|
473 | try {
|
---|
474 | // kde seems to append a 0 char to the end of the reader
|
---|
475 | if(ZERO_CHAR_STRING.equals(line)) continue;
|
---|
476 |
|
---|
477 | java.io.File file = new java.io.File(new java.net.URI(line));
|
---|
478 | list.add(file);
|
---|
479 | } catch (Exception ex) {
|
---|
480 | log(out, "Error with " + line + ": " + ex.getMessage());
|
---|
481 | }
|
---|
482 | }
|
---|
483 |
|
---|
484 | return (java.io.File[]) list.toArray(new File[list.size()]);
|
---|
485 | } catch (IOException ex) {
|
---|
486 | log(out, "FileDrop: IOException");
|
---|
487 | }
|
---|
488 | return new File[0];
|
---|
489 | }
|
---|
490 | // END 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.
|
---|
491 |
|
---|
492 |
|
---|
493 | private void makeDropTarget( final java.io.PrintStream out, final java.awt.Component c, boolean recursive )
|
---|
494 | {
|
---|
495 | // Make drop target
|
---|
496 | final java.awt.dnd.DropTarget dt = new java.awt.dnd.DropTarget();
|
---|
497 | try
|
---|
498 | { dt.addDropTargetListener( dropListener );
|
---|
499 | } // end try
|
---|
500 | catch( java.util.TooManyListenersException e )
|
---|
501 | { e.printStackTrace();
|
---|
502 | log(out, "FileDrop: Drop will not work due to previous error. Do you have another listener attached?" );
|
---|
503 | } // end catch
|
---|
504 |
|
---|
505 | // Listen for hierarchy changes and remove the drop target when the parent gets cleared out.
|
---|
506 | c.addHierarchyListener( new java.awt.event.HierarchyListener()
|
---|
507 | { public void hierarchyChanged( java.awt.event.HierarchyEvent evt )
|
---|
508 | { log( out, "FileDrop: Hierarchy changed." );
|
---|
509 | java.awt.Component parent = c.getParent();
|
---|
510 | if( parent == null )
|
---|
511 | { c.setDropTarget( null );
|
---|
512 | log( out, "FileDrop: Drop target cleared from component." );
|
---|
513 | } // end if: null parent
|
---|
514 | else
|
---|
515 | { new java.awt.dnd.DropTarget(c, dropListener);
|
---|
516 | log( out, "FileDrop: Drop target added to component." );
|
---|
517 | } // end else: parent not null
|
---|
518 | } // end hierarchyChanged
|
---|
519 | }); // end hierarchy listener
|
---|
520 | if( c.getParent() != null )
|
---|
521 | new java.awt.dnd.DropTarget(c, dropListener);
|
---|
522 |
|
---|
523 | if( recursive && (c instanceof java.awt.Container ) )
|
---|
524 | {
|
---|
525 | // Get the container
|
---|
526 | java.awt.Container cont = (java.awt.Container) c;
|
---|
527 |
|
---|
528 | // Get it's components
|
---|
529 | java.awt.Component[] comps = cont.getComponents();
|
---|
530 |
|
---|
531 | // Set it's components as listeners also
|
---|
532 | for( int i = 0; i < comps.length; i++ )
|
---|
533 | makeDropTarget( out, comps[i], recursive );
|
---|
534 | } // end if: recursively set components as listener
|
---|
535 | } // end dropListener
|
---|
536 |
|
---|
537 |
|
---|
538 |
|
---|
539 | /** Determine if the dragged data is a file list. */
|
---|
540 | private boolean isDragOk( final java.io.PrintStream out, final java.awt.dnd.DropTargetDragEvent evt )
|
---|
541 | { boolean ok = false;
|
---|
542 |
|
---|
543 | // Get data flavors being dragged
|
---|
544 | java.awt.datatransfer.DataFlavor[] flavors = evt.getCurrentDataFlavors();
|
---|
545 |
|
---|
546 | // See if any of the flavors are a file list
|
---|
547 | int i = 0;
|
---|
548 | while( !ok && i < flavors.length )
|
---|
549 | {
|
---|
550 | // BEGIN 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.
|
---|
551 | // Is the flavor a file list?
|
---|
552 | final DataFlavor curFlavor = flavors[i];
|
---|
553 | if( curFlavor.equals( java.awt.datatransfer.DataFlavor.javaFileListFlavor ) ||
|
---|
554 | curFlavor.isRepresentationClassReader()){
|
---|
555 | ok = true;
|
---|
556 | }
|
---|
557 | // END 2007-09-12 Nathan Blomquist -- Linux (KDE/Gnome) support added.
|
---|
558 | i++;
|
---|
559 | } // end while: through flavors
|
---|
560 |
|
---|
561 | // If logging is enabled, show data flavors
|
---|
562 | if( out != null )
|
---|
563 | { if( flavors.length == 0 )
|
---|
564 | log( out, "FileDrop: no data flavors." );
|
---|
565 | for( i = 0; i < flavors.length; i++ )
|
---|
566 | log( out, flavors[i].toString() );
|
---|
567 | } // end if: logging enabled
|
---|
568 |
|
---|
569 | return ok;
|
---|
570 | } // end isDragOk
|
---|
571 |
|
---|
572 |
|
---|
573 | /** Outputs <tt>message</tt> to <tt>out</tt> if it's not null. */
|
---|
574 | private static void log( java.io.PrintStream out, String message )
|
---|
575 | { // Log message if requested
|
---|
576 | if( out != null )
|
---|
577 | out.println( message );
|
---|
578 | } // end log
|
---|
579 |
|
---|
580 |
|
---|
581 |
|
---|
582 |
|
---|
583 | /**
|
---|
584 | * Removes the drag-and-drop hooks from the component and optionally
|
---|
585 | * from the all children. You should call this if you add and remove
|
---|
586 | * components after you've set up the drag-and-drop.
|
---|
587 | * This will recursively unregister all components contained within
|
---|
588 | * <var>c</var> if <var>c</var> is a {@link java.awt.Container}.
|
---|
589 | *
|
---|
590 | * @param c The component to unregister as a drop target
|
---|
591 | * @since 1.0
|
---|
592 | */
|
---|
593 | public static boolean remove( java.awt.Component c)
|
---|
594 | { return remove( null, c, true );
|
---|
595 | } // end remove
|
---|
596 |
|
---|
597 |
|
---|
598 |
|
---|
599 | /**
|
---|
600 | * Removes the drag-and-drop hooks from the component and optionally
|
---|
601 | * from the all children. You should call this if you add and remove
|
---|
602 | * components after you've set up the drag-and-drop.
|
---|
603 | *
|
---|
604 | * @param out Optional {@link java.io.PrintStream} for logging drag and drop messages
|
---|
605 | * @param c The component to unregister
|
---|
606 | * @param recursive Recursively unregister components within a container
|
---|
607 | * @since 1.0
|
---|
608 | */
|
---|
609 | public static boolean remove( java.io.PrintStream out, java.awt.Component c, boolean recursive )
|
---|
610 | { // Make sure we support dnd.
|
---|
611 | if( supportsDnD() )
|
---|
612 | { log( out, "FileDrop: Removing drag-and-drop hooks." );
|
---|
613 | c.setDropTarget( null );
|
---|
614 | if( recursive && ( c instanceof java.awt.Container ) )
|
---|
615 | { java.awt.Component[] comps = ((java.awt.Container)c).getComponents();
|
---|
616 | for( int i = 0; i < comps.length; i++ )
|
---|
617 | remove( out, comps[i], recursive );
|
---|
618 | return true;
|
---|
619 | } // end if: recursive
|
---|
620 | else return false;
|
---|
621 | } // end if: supports DnD
|
---|
622 | else return false;
|
---|
623 | } // end remove
|
---|
624 |
|
---|
625 |
|
---|
626 |
|
---|
627 |
|
---|
628 | /* ******** I N N E R I N T E R F A C E L I S T E N E R ******** */
|
---|
629 |
|
---|
630 |
|
---|
631 | /**
|
---|
632 | * Implement this inner interface to listen for when files are dropped. For example
|
---|
633 | * your class declaration may begin like this:
|
---|
634 | * <code><pre>
|
---|
635 | * public class MyClass implements FileDrop.Listener
|
---|
636 | * ...
|
---|
637 | * public void filesDropped( java.io.File[] files )
|
---|
638 | * {
|
---|
639 | * ...
|
---|
640 | * } // end filesDropped
|
---|
641 | * ...
|
---|
642 | * </pre></code>
|
---|
643 | *
|
---|
644 | * @since 1.1
|
---|
645 | */
|
---|
646 | public static interface Listener {
|
---|
647 |
|
---|
648 | /**
|
---|
649 | * This method is called when files have been successfully dropped.
|
---|
650 | *
|
---|
651 | * @param files An array of <tt>File</tt>s that were dropped.
|
---|
652 | * @since 1.0
|
---|
653 | */
|
---|
654 | public abstract void filesDropped( java.io.File[] files );
|
---|
655 |
|
---|
656 |
|
---|
657 | } // end inner-interface Listener
|
---|
658 |
|
---|
659 |
|
---|
660 | /* ******** I N N E R C L A S S ******** */
|
---|
661 |
|
---|
662 |
|
---|
663 | /**
|
---|
664 | * This is the event that is passed to the
|
---|
665 | * {@link FileDropListener#filesDropped filesDropped(...)} method in
|
---|
666 | * your {@link FileDropListener} when files are dropped onto
|
---|
667 | * a registered drop target.
|
---|
668 | *
|
---|
669 | * <p>I'm releasing this code into the Public Domain. Enjoy.</p>
|
---|
670 | *
|
---|
671 | * @author Robert Harder
|
---|
672 | * @author rob@iharder.net
|
---|
673 | * @version 1.2
|
---|
674 | */
|
---|
675 | public static class Event extends java.util.EventObject {
|
---|
676 |
|
---|
677 | private java.io.File[] files;
|
---|
678 |
|
---|
679 | /**
|
---|
680 | * Constructs an {@link Event} with the array
|
---|
681 | * of files that were dropped and the
|
---|
682 | * {@link FileDrop} that initiated the event.
|
---|
683 | *
|
---|
684 | * @param files The array of files that were dropped
|
---|
685 | * @source The event source
|
---|
686 | * @since 1.1
|
---|
687 | */
|
---|
688 | public Event( java.io.File[] files, Object source ) {
|
---|
689 | super( source );
|
---|
690 | this.files = files;
|
---|
691 | } // end constructor
|
---|
692 |
|
---|
693 | /**
|
---|
694 | * Returns an array of files that were dropped on a
|
---|
695 | * registered drop target.
|
---|
696 | *
|
---|
697 | * @return array of files that were dropped
|
---|
698 | * @since 1.1
|
---|
699 | */
|
---|
700 | public java.io.File[] getFiles() {
|
---|
701 | return files;
|
---|
702 | } // end getFiles
|
---|
703 |
|
---|
704 | } // end inner class Event
|
---|
705 |
|
---|
706 |
|
---|
707 |
|
---|
708 | /* ******** I N N E R C L A S S ******** */
|
---|
709 |
|
---|
710 |
|
---|
711 | /**
|
---|
712 | * At last an easy way to encapsulate your custom objects for dragging and dropping
|
---|
713 | * in your Java programs!
|
---|
714 | * When you need to create a {@link java.awt.datatransfer.Transferable} object,
|
---|
715 | * use this class to wrap your object.
|
---|
716 | * For example:
|
---|
717 | * <pre><code>
|
---|
718 | * ...
|
---|
719 | * MyCoolClass myObj = new MyCoolClass();
|
---|
720 | * Transferable xfer = new TransferableObject( myObj );
|
---|
721 | * ...
|
---|
722 | * </code></pre>
|
---|
723 | * Or if you need to know when the data was actually dropped, like when you're
|
---|
724 | * moving data out of a list, say, you can use the {@link TransferableObject.Fetcher}
|
---|
725 | * inner class to return your object Just in Time.
|
---|
726 | * For example:
|
---|
727 | * <pre><code>
|
---|
728 | * ...
|
---|
729 | * final MyCoolClass myObj = new MyCoolClass();
|
---|
730 | *
|
---|
731 | * TransferableObject.Fetcher fetcher = new TransferableObject.Fetcher()
|
---|
732 | * { public Object getObject(){ return myObj; }
|
---|
733 | * }; // end fetcher
|
---|
734 | *
|
---|
735 | * Transferable xfer = new TransferableObject( fetcher );
|
---|
736 | * ...
|
---|
737 | * </code></pre>
|
---|
738 | *
|
---|
739 | * The {@link java.awt.datatransfer.DataFlavor} associated with
|
---|
740 | * {@link TransferableObject} has the representation class
|
---|
741 | * <tt>net.iharder.dnd.TransferableObject.class</tt> and MIME type
|
---|
742 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>.
|
---|
743 | * This data flavor is accessible via the static
|
---|
744 | * {@link #DATA_FLAVOR} property.
|
---|
745 | *
|
---|
746 | *
|
---|
747 | * <p>I'm releasing this code into the Public Domain. Enjoy.</p>
|
---|
748 | *
|
---|
749 | * @author Robert Harder
|
---|
750 | * @author rob@iharder.net
|
---|
751 | * @version 1.2
|
---|
752 | */
|
---|
753 | public static class TransferableObject implements java.awt.datatransfer.Transferable
|
---|
754 | {
|
---|
755 | /**
|
---|
756 | * The MIME type for {@link #DATA_FLAVOR} is
|
---|
757 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>.
|
---|
758 | *
|
---|
759 | * @since 1.1
|
---|
760 | */
|
---|
761 | public final static String MIME_TYPE = "application/x-net.iharder.dnd.TransferableObject";
|
---|
762 |
|
---|
763 |
|
---|
764 | /**
|
---|
765 | * The default {@link java.awt.datatransfer.DataFlavor} for
|
---|
766 | * {@link TransferableObject} has the representation class
|
---|
767 | * <tt>net.iharder.dnd.TransferableObject.class</tt>
|
---|
768 | * and the MIME type
|
---|
769 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>.
|
---|
770 | *
|
---|
771 | * @since 1.1
|
---|
772 | */
|
---|
773 | public final static java.awt.datatransfer.DataFlavor DATA_FLAVOR =
|
---|
774 | new java.awt.datatransfer.DataFlavor( FileDrop.TransferableObject.class, MIME_TYPE );
|
---|
775 |
|
---|
776 |
|
---|
777 | private Fetcher fetcher;
|
---|
778 | private Object data;
|
---|
779 |
|
---|
780 | private java.awt.datatransfer.DataFlavor customFlavor;
|
---|
781 |
|
---|
782 |
|
---|
783 |
|
---|
784 | /**
|
---|
785 | * Creates a new {@link TransferableObject} that wraps <var>data</var>.
|
---|
786 | * Along with the {@link #DATA_FLAVOR} associated with this class,
|
---|
787 | * this creates a custom data flavor with a representation class
|
---|
788 | * determined from <code>data.getClass()</code> and the MIME type
|
---|
789 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>.
|
---|
790 | *
|
---|
791 | * @param data The data to transfer
|
---|
792 | * @since 1.1
|
---|
793 | */
|
---|
794 | public TransferableObject( Object data )
|
---|
795 | { this.data = data;
|
---|
796 | this.customFlavor = new java.awt.datatransfer.DataFlavor( data.getClass(), MIME_TYPE );
|
---|
797 | } // end constructor
|
---|
798 |
|
---|
799 |
|
---|
800 |
|
---|
801 | /**
|
---|
802 | * Creates a new {@link TransferableObject} that will return the
|
---|
803 | * object that is returned by <var>fetcher</var>.
|
---|
804 | * No custom data flavor is set other than the default
|
---|
805 | * {@link #DATA_FLAVOR}.
|
---|
806 | *
|
---|
807 | * @see Fetcher
|
---|
808 | * @param fetcher The {@link Fetcher} that will return the data object
|
---|
809 | * @since 1.1
|
---|
810 | */
|
---|
811 | public TransferableObject( Fetcher fetcher )
|
---|
812 | { this.fetcher = fetcher;
|
---|
813 | } // end constructor
|
---|
814 |
|
---|
815 |
|
---|
816 |
|
---|
817 | /**
|
---|
818 | * Creates a new {@link TransferableObject} that will return the
|
---|
819 | * object that is returned by <var>fetcher</var>.
|
---|
820 | * Along with the {@link #DATA_FLAVOR} associated with this class,
|
---|
821 | * this creates a custom data flavor with a representation class <var>dataClass</var>
|
---|
822 | * and the MIME type
|
---|
823 | * <tt>application/x-net.iharder.dnd.TransferableObject</tt>.
|
---|
824 | *
|
---|
825 | * @see Fetcher
|
---|
826 | * @param dataClass The {@link java.lang.Class} to use in the custom data flavor
|
---|
827 | * @param fetcher The {@link Fetcher} that will return the data object
|
---|
828 | * @since 1.1
|
---|
829 | */
|
---|
830 | public TransferableObject( Class dataClass, Fetcher fetcher )
|
---|
831 | { this.fetcher = fetcher;
|
---|
832 | this.customFlavor = new java.awt.datatransfer.DataFlavor( dataClass, MIME_TYPE );
|
---|
833 | } // end constructor
|
---|
834 |
|
---|
835 | /**
|
---|
836 | * Returns the custom {@link java.awt.datatransfer.DataFlavor} associated
|
---|
837 | * with the encapsulated object or <tt>null</tt> if the {@link Fetcher}
|
---|
838 | * constructor was used without passing a {@link java.lang.Class}.
|
---|
839 | *
|
---|
840 | * @return The custom data flavor for the encapsulated object
|
---|
841 | * @since 1.1
|
---|
842 | */
|
---|
843 | public java.awt.datatransfer.DataFlavor getCustomDataFlavor()
|
---|
844 | { return customFlavor;
|
---|
845 | } // end getCustomDataFlavor
|
---|
846 |
|
---|
847 |
|
---|
848 | /* ******** T R A N S F E R A B L E M E T H O D S ******** */
|
---|
849 |
|
---|
850 |
|
---|
851 | /**
|
---|
852 | * Returns a two- or three-element array containing first
|
---|
853 | * the custom data flavor, if one was created in the constructors,
|
---|
854 | * second the default {@link #DATA_FLAVOR} associated with
|
---|
855 | * {@link TransferableObject}, and third the
|
---|
856 | * {@link java.awt.datatransfer.DataFlavor.stringFlavor}.
|
---|
857 | *
|
---|
858 | * @return An array of supported data flavors
|
---|
859 | * @since 1.1
|
---|
860 | */
|
---|
861 | public java.awt.datatransfer.DataFlavor[] getTransferDataFlavors()
|
---|
862 | {
|
---|
863 | if( customFlavor != null )
|
---|
864 | return new java.awt.datatransfer.DataFlavor[]
|
---|
865 | { customFlavor,
|
---|
866 | DATA_FLAVOR,
|
---|
867 | java.awt.datatransfer.DataFlavor.stringFlavor
|
---|
868 | }; // end flavors array
|
---|
869 | else
|
---|
870 | return new java.awt.datatransfer.DataFlavor[]
|
---|
871 | { DATA_FLAVOR,
|
---|
872 | java.awt.datatransfer.DataFlavor.stringFlavor
|
---|
873 | }; // end flavors array
|
---|
874 | } // end getTransferDataFlavors
|
---|
875 |
|
---|
876 |
|
---|
877 |
|
---|
878 | /**
|
---|
879 | * Returns the data encapsulated in this {@link TransferableObject}.
|
---|
880 | * If the {@link Fetcher} constructor was used, then this is when
|
---|
881 | * the {@link Fetcher#getObject getObject()} method will be called.
|
---|
882 | * If the requested data flavor is not supported, then the
|
---|
883 | * {@link Fetcher#getObject getObject()} method will not be called.
|
---|
884 | *
|
---|
885 | * @param flavor The data flavor for the data to return
|
---|
886 | * @return The dropped data
|
---|
887 | * @since 1.1
|
---|
888 | */
|
---|
889 | public Object getTransferData( java.awt.datatransfer.DataFlavor flavor )
|
---|
890 | throws java.awt.datatransfer.UnsupportedFlavorException, java.io.IOException
|
---|
891 | {
|
---|
892 | // Native object
|
---|
893 | if( flavor.equals( DATA_FLAVOR ) )
|
---|
894 | return fetcher == null ? data : fetcher.getObject();
|
---|
895 |
|
---|
896 | // String
|
---|
897 | if( flavor.equals( java.awt.datatransfer.DataFlavor.stringFlavor ) )
|
---|
898 | return fetcher == null ? data.toString() : fetcher.getObject().toString();
|
---|
899 |
|
---|
900 | // We can't do anything else
|
---|
901 | throw new java.awt.datatransfer.UnsupportedFlavorException(flavor);
|
---|
902 | } // end getTransferData
|
---|
903 |
|
---|
904 |
|
---|
905 |
|
---|
906 |
|
---|
907 | /**
|
---|
908 | * Returns <tt>true</tt> if <var>flavor</var> is one of the supported
|
---|
909 | * flavors. Flavors are supported using the <code>equals(...)</code> method.
|
---|
910 | *
|
---|
911 | * @param flavor The data flavor to check
|
---|
912 | * @return Whether or not the flavor is supported
|
---|
913 | * @since 1.1
|
---|
914 | */
|
---|
915 | public boolean isDataFlavorSupported( java.awt.datatransfer.DataFlavor flavor )
|
---|
916 | {
|
---|
917 | // Native object
|
---|
918 | if( flavor.equals( DATA_FLAVOR ) )
|
---|
919 | return true;
|
---|
920 |
|
---|
921 | // String
|
---|
922 | if( flavor.equals( java.awt.datatransfer.DataFlavor.stringFlavor ) )
|
---|
923 | return true;
|
---|
924 |
|
---|
925 | // We can't do anything else
|
---|
926 | return false;
|
---|
927 | } // end isDataFlavorSupported
|
---|
928 |
|
---|
929 |
|
---|
930 | /* ******** I N N E R I N T E R F A C E F E T C H E R ******** */
|
---|
931 |
|
---|
932 | /**
|
---|
933 | * Instead of passing your data directly to the {@link TransferableObject}
|
---|
934 | * constructor, you may want to know exactly when your data was received
|
---|
935 | * in case you need to remove it from its source (or do anyting else to it).
|
---|
936 | * When the {@link #getTransferData getTransferData(...)} method is called
|
---|
937 | * on the {@link TransferableObject}, the {@link Fetcher}'s
|
---|
938 | * {@link #getObject getObject()} method will be called.
|
---|
939 | *
|
---|
940 | * @author Robert Harder
|
---|
941 | * @copyright 2001
|
---|
942 | * @version 1.1
|
---|
943 | * @since 1.1
|
---|
944 | */
|
---|
945 | public static interface Fetcher
|
---|
946 | {
|
---|
947 | /**
|
---|
948 | * Return the object being encapsulated in the
|
---|
949 | * {@link TransferableObject}.
|
---|
950 | *
|
---|
951 | * @return The dropped object
|
---|
952 | * @since 1.1
|
---|
953 | */
|
---|
954 | public abstract Object getObject();
|
---|
955 | } // end inner interface Fetcher
|
---|
956 |
|
---|
957 |
|
---|
958 |
|
---|
959 | } // end class TransferableObject
|
---|
960 |
|
---|
961 |
|
---|
962 |
|
---|
963 |
|
---|
964 |
|
---|
965 | } // end class FileDrop
|
---|