java-gnome-developer

[Java-gnome-developer] A little Problem

[Ralph H. <ra...@gm...>]

Hi, 

sorry for my bad english!

I have a problem with this little program. I will split the program into
and control Class. I have create a litlle gui with glade. When i start
the program i become an Exception, dont understand this... :(


Exception in thread "main" java.lang.NullPointerException
	at org.gnu.gtk.Button.fireButtonEvent(Button.java:293)
	at org.gnu.gtk.Button.handleEnter(Button.java:307)
	at org.gnu.gtk.Gtk.gtk_main(Native Method)
	at org.gnu.gtk.Gtk.main(Gtk.java:55)
	at presentation.programm.Example.main(Example.java:26)
Exception in thread "main" java.lang.NullPointerException
	at org.gnu.gtk.Button.fireButtonEvent(Button.java:293)
	at org.gnu.gtk.Button.handleLeave(Button.java:311)
	at org.gnu.gtk.Gtk.gtk_main(Native Method)
	at org.gnu.gtk.Gtk.main(Gtk.java:55)
	at presentation.programm.Example.main(Example.java:26)

This Exception come when i move the mouse over the button. 

Greets Ralph

Oh, thanks for the TreeView Guide. This was very helpful for me!!!


-------------- Example.java --------------------

package presentation.programm;
import org.gnu.gtk.*;
import org.gnu.glade.*;
import org.gnu.gnome.Program;
import control.ControlExample;


public class Example{
	Button button;
	ControlExample control;

	public Example() {
		try {
			LibGlade glade = new LibGlade("glade/2.glade", this);
			button = (Button) glade.getWidget("button1");								
		} catch (Exception e) {			
		}
		button.addListener(getControl());
	}
	public ControlExample getControl(){
		return control;
	}	
	public static void main(String[] args)  {		
		Program.initGnomeUI("Hello", "0.1", args);
		new Example();
		Gtk.main();		
}
}

-------------- End Example.java --------------------

-------------- ControlExample.java --------------------

package control;

import org.gnu.gtk.event.*;

public class ControlExample implements ButtonListener {
	public ControlExample() {

	}
	
	public void buttonEvent(ButtonEvent event) {		
			System.out.println("Hello");		
	}
}

-------------- End ControlExample.java --------------------

-------------- 2.glade --------------------
<?xml version="1.0" standalone="no"?> <!--*- mode: xml -*-->
<!DOCTYPE glade-interface SYSTEM "http://glade.gnome.org/glade-2.0.dtd">

<glade-interface>
<requires lib="gnome"/>

<widget class="GtkWindow" id="window1">
  <property name="visible">True</property>
  <property name="title" translatable="yes">window1</property>
  <property name="type">GTK_WINDOW_TOPLEVEL</property>
  <property name="window_position">GTK_WIN_POS_NONE</property>
  <property name="modal">False</property>
  <property name="resizable">True</property>
  <property name="destroy_with_parent">False</property>
  <property name="decorated">True</property>
  <property name="skip_taskbar_hint">False</property>
  <property name="skip_pager_hint">False</property>
  <property name="type_hint">GDK_WINDOW_TYPE_HINT_NORMAL</property>
  <property name="gravity">GDK_GRAVITY_NORTH_WEST</property>

  <child>
    <widget class="GtkButton" id="button1">
      <property name="visible">True</property>
      <property name="can_focus">True</property>
      <property name="label">gnome-stock-about</property>
      <property name="use_stock">True</property>
      <property name="relief">GTK_RELIEF_NORMAL</property>
      <property name="focus_on_click">False</property>
    </widget>
  </child>
</widget>

</glade-interface>


-------------- End 2.glade --------------------

-- 
Ralph Henneberger <ra...@gm...>

Re: [Java-gnome-developer] A little Problem

[Arx H. <ar...@gm...>]

try this:

or better, put in button.addlisntener this

button1.addListener(new ControlExample());

you dont need getControl method



> package presentation.programm;
> import org.gnu.gtk.*;
> import org.gnu.glade.*;
> import org.gnu.gnome.Program;
> import control.ControlExample;
>=20
>=20
> public class Example{
>         Button button;

>         ControlExample control =3D new ControlExample();

>=20
>         public Example() {
>                 try {
>                         LibGlade glade =3D new LibGlade("glade/2.glade", =
this);
>                         button =3D (Button) glade.getWidget("button1");
>                 } catch (Exception e) {
>                 }
>                 button.addListener(getControl());
>         }
>         public ControlExample getControl(){
>                 return this.control;
>         }
>         public static void main(String[] args)  {
>                 Program.initGnomeUI("Hello", "0.1", args);
>                 new Example();
>                 Gtk.main();
> }
> }
>=20
> -------------- End Example.java --------------------

Re: [Java-gnome-developer] A little Problem

[Ralph H. <ra...@gm...>]

Am Freitag, den 27.05.2005, 02:29 -0300 schrieb Arx Henrique:
> try this:
> 
> or better, put in button.addlisntener this
> 
> button1.addListener(new ControlExample());
> 
> you dont need getControl method
> 
Hello Arx,

Ok, this works, It was very distressing for me :(
Thanx.  I'm sure the next Problem will come.

Ralph
-- 
Ralph Henneberger <ra...@gm...>