Java Tutorial/SWT/ColorDialog

17. Choosing a Color

1. SWT provides a class called RGB that stores RGB values.
2. RGB class holds the data that can represent a color.
3. SWT provides a class called Color that represents an actual color.

   <source lang="java">

import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.widgets.Display; public class ColorCreate {

 public static void main(String[] args) {
   Display display = new Display();
   RGB rgb = new RGB(255, 0, 0); // pure red
   Color color = new Color(display, rgb);
   System.out.println(color.getBlue());
   display.dispose();
 }

}</source>

17. Customizing the Color Selection Dialog

   <source lang="java">

import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.widgets.ColorDialog; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class ColorDialogSetInitColor {

 public static void main(String[] args) {
   Display display = new Display();
   Shell shell = new Shell(display);
   ColorDialog dlg = new ColorDialog(shell);
   dlg.setRGB(new RGB(0, 0, 255));
   RGB rgb = dlg.open();
   if (rgb != null) {
     Color color = new Color(shell.getDisplay(), rgb);
     System.out.println(color.getRGB());
     
     color.dispose();
   }
   display.dispose();
 }

}</source>

17. Get Selected Color from ColorDialog

   <source lang="java">

import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.widgets.ColorDialog; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class ColorDialogCreateGetColor {

 public static void main(String[] args) {
   Display display = new Display();
   Shell shell = new Shell(display);
   ColorDialog dlg = new ColorDialog(shell);
   RGB rgb = dlg.open();
   if (rgb != null) {
     Color color = new Color(shell.getDisplay(), rgb);
     
     System.out.println(color.getRGB());
     
     color.dispose();
   }
   display.dispose();
 }

}</source>

17. Set Label Background to a color selected in ColorDialog

   <source lang="java">

import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.graphics.Color; import org.eclipse.swt.graphics.RGB; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.ColorDialog; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; public class ColorDialogButtonActionSetLabelBackground {

 public static void main(String[] args) {
   Display display = new Display();
   final Shell shell = new Shell(display);
   shell.setText("Color Chooser");
   shell.setLayout(new GridLayout(2, false));
   final Label colorLabel = new Label(shell, SWT.NONE);
   colorLabel.setText("Color");
   Button button = new Button(shell, SWT.PUSH);
   button.setText("Color...");
   button.addSelectionListener(new SelectionAdapter() {
     public void widgetSelected(SelectionEvent event) {
       Color color = new Color(shell.getDisplay(), new RGB(0, 255, 0));
       ColorDialog dlg = new ColorDialog(shell);
       dlg.setRGB(colorLabel.getBackground().getRGB());
       dlg.setText("Choose a Color");
       RGB rgb = dlg.open();
       if (rgb != null) {
         color.dispose();
         color = new Color(shell.getDisplay(), rgb);
         colorLabel.setBackground(color);
         color.dispose();
       }
     }
   });
   shell.pack();
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch()) {
       display.sleep();
     }
   }
   display.dispose();
 }

}</source>