ComboBox Events bug?

[Manuel Clos]

Hi all,

I'm trying to use the "FOCUS_OUT" event out of ComboBox, since it
extends from Bin which extends from Container which finally extends from
Widget, I should able to get the event, right?

I'm attaching a ComboBoxListener and I get the CHANGED event.
I'm attaching a ContainerListener and I _don't_ get any Container event.
I'm attaching a FocusListener and I _don't_ get any focus event.

So it seems that something gets wrong in ComboBox <-> Bin <-> Container.

Can anyone look into this? Should I send a simple example? Any hints to
fix the bug myself :)?

Thanks!


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[Andrew Cowie]

On Wed, 2006-08-02 at 08:41 +0100, Manuel Clos wrote:
> I'm trying to use the "FOCUS_OUT" event out of ComboBox,

I've only used FOCUS_OUT once, but it works ok:
http://research.operationaldynamics.com/source/darcsweb/?r=objective;a=headblob;f=/src/accounts/ui/ForeignAmountEntryBox.java#l118

(and two others in that file. I note that I'm using it against an Entry
so that doesn't necessarily prove anything for you. You might want to
have a glance there to make sure you're doing the Listener/Event
correctly, though)

> Can anyone look into this? Should I send a simple example?

Test cases are always brilliant. They are, of course, hard to generate
in a compact way so I for one always take the time to try them if
someone goes to the trouble.

AfC
Sydney



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[Manuel Clos]

Hi,

Here is a compact example, showing that Entry produces focus events,
while ComboBox doesn't.


Andrew Cowie wrote:
> Test cases are always brilliant. They are, of course, hard to generate
> in a compact way so I for one always take the time to try them if
> someone goes to the trouble.

import org.gnu.gtk.ComboBox;
import org.gnu.gtk.Entry;
import org.gnu.gtk.Gtk;
import org.gnu.gtk.VBox;
import org.gnu.gtk.Window;
import org.gnu.gtk.event.FocusEvent;
import org.gnu.gtk.event.FocusListener;

public class ComboTest {

    public ComboTest() {
        Window w = new Window();
        VBox box = new VBox(false, 0);
       
        ComboBox cb = new ComboBox();
        cb.appendText("foo");
        cb.appendText("bar");
        cb.addListener(new FocusListener() {
            public boolean focusEvent(FocusEvent event) {
                System.out.println("I'm a FocusEvent of the ComboBox");
                return false;
            }          
        });
       
        Entry e = new Entry();
        e.addListener(new FocusListener() {
            public boolean focusEvent(FocusEvent event) {
                System.out.println("I'm a FocusEvent of the Entry");
                return false;
            }          
        });
       
        box.packStart(cb, false, false, 0);
        box.packStart(e, false, false, 0);
        box.setBorderWidth(20);
        box.setSpacing(10);
       
        w.add(box);
       
        w.showAll();        
    }

    public static void main(String[] args) {
        Gtk.init (args);

        ComboTest ct = new ComboTest();

        Gtk.main ();
    }

}

[Andrew Cowie]

On Wed, 2006-08-02 at 11:50 +0100, Manuel Clos wrote:
> Here is a compact example, showing that Entry produces focus events,
> while ComboBox doesn't.

Duplicated.

Manuel, chat with the day-shift guys in Toronto on IRC, but if none of
them are able to figure this one out quickly, I'd suggest you raise a
bug in Bugzilla (against java-gnome/libgtk-java) and attach your test
case.

Cheers,

AfC
Sydney




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[Manuel Clos]

Hi all,

Here is what I found so far:

- It looks that there is no problem in java-gnome: ComboBox as Button
both extend Bin, and Button is working properly. No code in the
hierarchy captures the signal or prevents emiting it.

- Attaching a ContainerListener to the ComboBox gives you a
SET_FOCUS_CHILD event, while doing the same in the Button doesn't.

- Looking at the gtk code, it looks that the combobox grabs the focus to
some of his childrens, so the combobox itself never gets focus, and
doesn't emit a focus signal itself.

- Writing a similar example in C gives the same results: the Button
emits the focus out event and the ComboBox doesn't.

- I'm left to using the SET_FOCUS_CHILD of the Container when using a
ComboBox.

- It remains for more experienced people to decide if this is a bug /
design decision from GTK, and people should use SET_FOCUS_CHILD (and we
need to document it :)).

Examples attached.

See you!



Andrew Cowie wrote:

> On Wed, 2006-08-02 at 11:50 +0100, Manuel Clos wrote:
>> Here is a compact example, showing that Entry produces focus events,
>> while ComboBox doesn't.
>
> Duplicated.
>
> Manuel, chat with the day-shift guys in Toronto on IRC, but if none of
> them are able to figure this one out quickly, I'd suggest you raise a
> bug in Bugzilla (against java-gnome/libgtk-java) and attach your test
> case.

#include <gtk/gtk.h>
 
void combo_hello (GtkWidget *widget, gpointer data)
{
         g_print ("Focus out event in the combo\n");
}

void button_hello (GtkWidget *widget, gpointer data)
{
         g_print ("Focus out event in the button\n");
}
                   

int main (int argc, char *argv[])
     {
         GtkWidget *window;
         GtkVBox *vbox;
         GtkComboBox *cb;
         GtkButton *b;
         
         gtk_init (&argc, &argv);
         
         window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
         vbox = gtk_vbox_new (FALSE, 0);
         cb = gtk_combo_box_new_text();
         gtk_combo_box_append_text(cb, "foo");
         gtk_combo_box_append_text(cb, "bar");
         
         b = gtk_button_new_with_label("button");
         
         gtk_signal_connect (GTK_OBJECT (cb), "focus_out_event",
                             GTK_SIGNAL_FUNC (combo_hello), NULL);

         gtk_signal_connect (GTK_OBJECT (b), "focus_out_event",
                             GTK_SIGNAL_FUNC (button_hello), NULL);
         
         gtk_box_pack_start(GTK_BOX(vbox), GTK_WIDGET(cb), FALSE, FALSE, 0);
         gtk_box_pack_start(GTK_BOX(vbox), GTK_WIDGET(b), FALSE, FALSE, 0);
         gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(vbox));
         gtk_widget_show_all (window);
         
         gtk_main ();
         
         return 0;
     }
 

import org.gnu.gtk.Button;
import org.gnu.gtk.ComboBox;
import org.gnu.gtk.Container;
import org.gnu.gtk.Entry;
import org.gnu.gtk.Gtk;
import org.gnu.gtk.VBox;
import org.gnu.gtk.Widget;
import org.gnu.gtk.Window;
import org.gnu.gtk.event.ContainerEvent;
import org.gnu.gtk.event.ContainerListener;
import org.gnu.gtk.event.FocusEvent;
import org.gnu.gtk.event.FocusListener;

public class ComboTest {

    ComboBox cb;
   
    public ComboTest() {
        Window w = new Window();
        VBox box = new VBox(false, 0);
       
        cb = new ComboBox();
        cb.appendText("foo");
        cb.appendText("bar");
        cb.addListener(new FocusListener() {
            public boolean focusEvent(FocusEvent event) {
                System.out.println("I'm a FocusEvent of the ComboBox");
                return false;
            }          
        });

        ((Container)cb).addListener(new FocusListener() {
            public boolean focusEvent(FocusEvent event) {
                System.out.println("I'm a FocusEvent of the Container");
                return false;
            }          
        });
       
        cb.addListener(new ContainerListener() {
            public void containerEvent(ContainerEvent event) {
                System.out.print("I'm a ContainerEvent of the ComboBox: ");
                if (event.getType() == ContainerEvent.Type.SET_FOCUS_CHILD) {
                    System.out.println("SET_FOCUS_CHILD");
                    cb.grabFocus();
                } else {
                    System.out.println();
                }
            }
        });
       
       
        Entry e = new Entry();
        e.addListener(new FocusListener() {
            public boolean focusEvent(FocusEvent event) {
                System.out.println("I'm a FocusEvent of the Entry");
                return false;
            }          
        });
       
        Button b = new Button("button");
        b.addListener(new FocusListener() {
            public boolean focusEvent(FocusEvent event) {
                System.out.println("I'm a FocusEvent of the Button");
                return false;
            }
        });

        b.addListener(new ContainerListener() {
            public void containerEvent(ContainerEvent event) {
                System.out.println("I'm a ContainerEvent of the Button");
            }
        });

        box.packStart(cb, false, false, 0);
        box.packStart(e, false, false, 0);
        box.packStart(b, false, false, 0);
        box.setBorderWidth(20);
        box.setSpacing(10);
       
        w.add(box);
       
        w.showAll();        
    }

    public static void main(String[] args) {
        Gtk.init (args);

        ComboTest ct = new ComboTest();

        Gtk.main ();
    }

}

[Ivan Baldo]

I went ahead and created a bug for this just in case: https://bugzilla.gnome.org/show_bug.cgi?id=599076.
Thanks!