Mega Code Archive
Drag Color Demo
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/* From http://java.sun.com/docs/books/tutorial/index.html */
/*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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* list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
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* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
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* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
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*/
/*
* DragColorDemo.java is a 1.4 example that requires
* the following file:
* ColorTransferHandler.java
*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JColorChooser;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.TransferHandler;
/**
* Example code that shows any JComponent can be customized to allow dropping of
* a color.
*/
public class DragColorDemo extends JPanel implements ActionListener {
JCheckBox toggleForeground;
ColorTransferHandler colorHandler;
public DragColorDemo() {
super(new BorderLayout());
setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
JColorChooser chooser = new JColorChooser();
chooser.setDragEnabled(true);
add(chooser, BorderLayout.PAGE_START);
//Create the color transfer handler.
colorHandler = new ColorTransferHandler();
//Create a matrix of 9 buttons.
JPanel buttonPanel = new JPanel(new GridLayout(3, 3));
for (int i = 0; i < 9; i++) {
JButton tmp = new JButton("Button " + i);
tmp.setTransferHandler(colorHandler);
buttonPanel.add(tmp);
}
add(buttonPanel, BorderLayout.CENTER);
//Create a check box.
toggleForeground = new JCheckBox("Change the foreground color.");
toggleForeground.setSelected(true);
toggleForeground.addActionListener(this);
JPanel textPanel = new JPanel(new BorderLayout());
textPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
textPanel.add(toggleForeground, BorderLayout.PAGE_START);
//Create a label.
JLabel label = new JLabel(
"Change the color of any button or this label by dropping a color.");
label.setTransferHandler(colorHandler);
label.setOpaque(true); //So the background color can be changed.
textPanel.add(label, BorderLayout.PAGE_END);
add(textPanel, BorderLayout.PAGE_END);
}
public void actionPerformed(ActionEvent e) {
colorHandler.setChangesForegroundColor(toggleForeground.isSelected());
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("DragColorDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and setup the content pane.
JComponent newContentPane = new DragColorDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
/*
* ColorTransferHandler.java is used by the 1.4 DragColorDemo.java and
* DragColorTextFieldDemo examples.
*/
/**
* An implementation of TransferHandler that adds support for dropping colors.
* Dropping a color on a component having this TransferHandler changes the
* foreground or the background of the component to the dropped color, according
* to the value of the changesForegroundColor property.
*/
class ColorTransferHandler extends TransferHandler {
//The data type exported from JColorChooser.
String mimeType = DataFlavor.javaJVMLocalObjectMimeType
+ ";class=java.awt.Color";
DataFlavor colorFlavor;
private boolean changesForegroundColor = true;
ColorTransferHandler() {
//Try to create a DataFlavor for color.
try {
colorFlavor = new DataFlavor(mimeType);
} catch (ClassNotFoundException e) {
}
}
/**
* Overridden to import a Color if it is available.
* getChangesForegroundColor is used to determine whether the foreground or
* the background color is changed.
*/
public boolean importData(JComponent c, Transferable t) {
if (hasColorFlavor(t.getTransferDataFlavors())) {
try {
Color col = (Color) t.getTransferData(colorFlavor);
if (getChangesForegroundColor()) {
c.setForeground(col);
} else {
c.setBackground(col);
}
return true;
} catch (UnsupportedFlavorException ufe) {
System.out.println("importData: unsupported data flavor");
} catch (IOException ioe) {
System.out.println("importData: I/O exception");
}
}
return false;
}
/**
* Does the flavor list have a Color flavor?
*/
protected boolean hasColorFlavor(DataFlavor[] flavors) {
if (colorFlavor == null) {
return false;
}
for (int i = 0; i < flavors.length; i++) {
if (colorFlavor.equals(flavors[i])) {
return true;
}
}
return false;
}
/**
* Overridden to include a check for a color flavor.
*/
public boolean canImport(JComponent c, DataFlavor[] flavors) {
return hasColorFlavor(flavors);
}
protected void setChangesForegroundColor(boolean flag) {
changesForegroundColor = flag;
}
protected boolean getChangesForegroundColor() {
return changesForegroundColor;
}
}
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