ChooseColor.java Source code

Introduction

Here is the source code for ChooseColor.java

Source

//Send questions, comments, bug reports, etc. to the authors:

//Rob Warner (rwarner@interspatial.com)
//Robert Harris (rbrt_harris@yahoo.com)

import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

/**
 * This class demonstrates the ColorDialog class
 */
public class ChooseColor {
    private Color color;

    /**
     * Runs the application
     */
    public void run() {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Color Chooser");
        createContents(shell);
        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        // Dispose the color we created for the Label
        if (color != null) {
            color.dispose();
        }
        display.dispose();
    }

    /**
     * Creates the window contents
     * 
     * @param shell the parent shell
     */
    private void createContents(final Shell shell) {
        shell.setLayout(new GridLayout(2, false));

        // Start with Celtics green
        color = new Color(shell.getDisplay(), new RGB(0, 255, 0));

        // Use a label full of spaces to show the color
        final Label colorLabel = new Label(shell, SWT.NONE);
        colorLabel.setText("                              ");
        colorLabel.setBackground(color);

        Button button = new Button(shell, SWT.PUSH);
        button.setText("Color...");
        button.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent event) {
                // Create the color-change dialog
                ColorDialog dlg = new ColorDialog(shell);

                // Set the selected color in the dialog from
                // user's selected color
                dlg.setRGB(colorLabel.getBackground().getRGB());

                // Change the title bar text
                dlg.setText("Choose a Color");

                // Open the dialog and retrieve the selected color
                RGB rgb = dlg.open();
                if (rgb != null) {
                    // Dispose the old color, create the
                    // new one, and set into the label
                    color.dispose();
                    color = new Color(shell.getDisplay(), rgb);
                    colorLabel.setBackground(color);
                }
            }
        });
    }

    /**
     * The application entry point
     * 
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new ChooseColor().run();
    }
}