Re: cobbling a ComboBox

From:

"Daniele Futtorovic" <daniele.futtorovic@THRWHITE.remove-dii-this>

Newsgroups:

comp.lang.java.gui

Date:

Wed, 27 Apr 2011 15:46:27 GMT

Message-ID:

<g3reau$avf$1@registered.motzarella.org>

To: comp.lang.java.gui
On 2008-06-24 05:25 +0100, Albretch Mueller allegedly wrote:

Daniele Futtorovic wrote:

Try UIManager.getColor(Object).

Actually I had done both.

I meant UIManager.getColor("InternalFrame.borderColor").

Note that ColorUIResource *extends* java.awt.Color.

If you go:

JFrame JFrm = new JFrame(" Seting Parsing Rules for: ");
Clr = UIManager.getColor(JFrm);
System.out.println("// __ UIManager.getColor(JFrm): |" + Clr + "|");

you will get:

// __ UIManager.getColor(JFrm): |null|

You might try to dump all the UIManager keys

(UIManager.getDefaults().keySet()) and look for the appropriate key.

That I did also via:

  String aKey;
  Hashtable HTUIDef = UIManager.getDefaults();
  Enumeration HTKeys = HTUIDef.keys();
  while(HTKeys.hasMoreElements()){
   Object ObjKey = HTKeys.nextElement();
   if(ObjKey instanceof String){
.. . .
   }
  }

for(Object o: UIManager.getDefaults().keySet()){
System.out.println(o);
}

;)

Chances are such nuanced behaviour as you want may not be available.

~
They are nuanced behaviours but I am trying to be a little more intuitive
to the user (in my understanding) and make the best use of the window's
real estate

Is the following what you try to achieve? Mind, it only works for one
specific L&F at a time (in this case "Metal", the cross-platform L&F).

<sscce>
package scratch;

import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
import javax.swing.plaf.metal.*;

public class Test {
     public static void main(String[] ss) throws Exception {
         UIManager.put("ComboBoxUI", "scratch.Test$CustomMetalComboBoxUI");

         Font fo = new Font("Sans Serif", Font.PLAIN, 12);
         UIManager.put("ComboBox.font", new FontUIResource(fo));

         fo = fo.deriveFont( Font.BOLD | Font.ITALIC );
         UIManager.put("ComboBox.popupSelectedFont", new
FontUIResource(fo));

         UIManager.put("ComboBox.popupSelectedBackground", new
ColorUIResource(0xfff0a0a0));

         EventQueue.invokeLater( new Runnable(){
             public void run(){
                 JComboBox jcb = new JComboBox(new Object[]{"One",
"Two", "Three", "Four", "Five", "Six"});

                 System.out.println(jcb.getUI().getClass().toString());

                 jcb.setBorder( BorderFactory.createEmptyBorder(40, 60,
40, 60) );

                 JFrame f = new JFrame();
                 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                 f.getContentPane().add(jcb, BorderLayout.CENTER);

                 f.pack();
                 f.setLocationRelativeTo(null);

                 f.setVisible(true);
             }
         });
     }

     public static class CustomMetalComboBoxUI
     extends MetalComboBoxUI
     {
         public static ComponentUI createUI(JComponent c) {
             return new CustomMetalComboBoxUI();
         }

         @Override
         protected ListCellRenderer createRenderer() {
             return new CustomComboBoxRenderer();
         }

         private class CustomComboBoxRenderer
         extends BasicComboBoxRenderer
         {
             final Font selectedFont =
UIManager.getFont("ComboBox.popupSelectedFont");
             final Color selectedBackground =
UIManager.getColor("ComboBox.popupSelectedBackground");

             @Override
             public Component getListCellRendererComponent(
                                                          JList list,
                                                          Object value,
                                                          int index,
                                                          boolean
isSelected,
                                                          boolean
cellHasFocus)
             {
                 Component c = super.getListCellRendererComponent(list,
value, index, isSelected, cellHasFocus);

                 if( index ==
CustomMetalComboBoxUI.this.comboBox.getSelectedIndex() ){
                     if( selectedFont != null ){
                         c.setFont( selectedFont );
                     }

                     if( selectedBackground != null && ! isSelected ){
                         c.setBackground( selectedBackground );
                     }
                 }

                 return c;
             }
         }
     }
}
</sscce>

--
DF.
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