refresh boxes without new gtk_box_pack_start

MBoerner · **Joined:** Fri Oct 26, 2012 10:49 am **Posts:** 22

Hello!
Happy new year to all members and thank you for your help during the last year!

Maybe it is a silly question but I'm not sure how to do it:
I have a dialog with 4 boxes, that I added with the command

Code:

gtk_box_pack_start (GTK_BOX (rm_local.widgets.vboxXXXX), alignSpeed ,TRUE, TRUE, 5);

The contains of the 1 and the 4th box are constant.
The contains of the boxes 2 and 3 are to be refreshed every second.

But If remove first the boxes 2 and 3 with the command

Code:

gtk_container_remove (GTK_CONTAINER(gtk_widget_get_parent(rm_local.widgets.vboxXXX)),   rm_local.widgets.vboxXXX);

I would get the new boxes behind the 1 and 4.
How can I "refresh" the contain of the boxes (labels and buttons) without removing the box before?

Or should I remove every time all the boxes in the dialog and make them all new even if they didn't change?
Thanks a lot in advance

MBoerner

errol · **Posted:** Wed Jan 02, 2013 5:34 pm

Hello,

It is not totally clear what you want to do.

I expect that what is needed is that you just want to up date the GtkLabel and GtkButton. You do not need to delete the container to do this. All that is needed is to set the new value to the GtkLabel or GtkButton.

MBoerner · **Joined:** Fri Oct 26, 2012 10:49 am **Posts:** 22

oh ok,
My problem is that I don't really understand whats happens when I use the command "pack_start"
Here is my code:
1) I read the new values from a variable that has been set in another task
2) I put them in a labelfield
3) I align them
4) I put the widgets in the boxes.

When the values are just changed, what should I do? Just remake the points 1 to 3 and then gtk_widget_show_all?
Can you give me an example How you would do it, if you use the same commands to fill the box "rm_local.widgets.vboxSpin"?

Thanks a lot!
MBoerner

Code:

static void rm_fill_box_stop_mode_spin(int stepnr)
{
   char strlabelSpeed[50];
   char strlabelAcc[50];
   char strlabelTime[50];
   GtkWidget* alignSpeed;
   GtkWidget* alignAcc;
   GtkWidget* alignTime;

// 1)set the current value of the speed, the acceleration and the ellapsed time
   sprintf(strlabelSpeed, "%s:%5d/%5d",descr_editBuffer.step.spin.speed.description, 0 ,recipe_editBuffer.step[stepnr].spin.speed);
   sprintf(strlabelAcc, "%s:%5d",descr_editBuffer.step.spin.acceleration.description, recipe_editBuffer.step[stepnr].spin.acceleration);
   sprintf(strlabelTime, "%s:%5d/%5d",descr_editBuffer.step.spin.spintime.description, 0, recipe_editBuffer.step[stepnr].spin.spintime);
// 2)put the values in label fields
   rm_local.widgets.lblSpinSpeed = gtk_label_new(strlabelSpeed);
   rm_local.widgets.lblSpinAcc = gtk_label_new(strlabelAcc);
   rm_local.widgets.lblSpinTime = gtk_label_new(strlabelTime);
// 3)align the fields
   alignSpeed = gtk_alignment_new(0.0, 0.5, 0.0, 0.0);
   gtk_container_add(GTK_CONTAINER(alignSpeed), rm_local.widgets.lblSpinSpeed);
   alignAcc = gtk_alignment_new(0.0, 0.5, 0.0, 0.0);
   gtk_container_add(GTK_CONTAINER(alignAcc), rm_local.widgets.lblSpinAcc);
   alignTime = gtk_alignment_new(0.0, 0.5, 0.0, 0.0);
   gtk_container_add(GTK_CONTAINER(alignTime), rm_local.widgets.lblSpinTime);
// 4)put them in the different boxes
   gtk_box_pack_start (GTK_BOX (rm_local.widgets.vboxSpin), alignSpeed ,TRUE, TRUE, 5);
   gtk_box_pack_start (GTK_BOX (rm_local.widgets.vboxSpin), alignAcc ,TRUE, TRUE, 5);
   gtk_box_pack_start (GTK_BOX (rm_local.widgets.vboxSpin), alignTime ,TRUE, TRUE, 5);
   gtk_label_set_justify(GTK_LABEL(rm_local.widgets.lblSpinSpeed), GTK_JUSTIFY_LEFT);
   gtk_label_set_justify(GTK_LABEL(rm_local.widgets.lblSpinAcc), GTK_JUSTIFY_LEFT);
}

step

MBoerner · **Joined:** Fri Oct 26, 2012 10:49 am **Posts:** 22

Thank you errol!
I tried just to change the text of the labels and refresh the dialogs.
It works!

Thank you!
MBoerner

zerohour · **Posted:** Sat Jan 05, 2013 4:13 am

Just as a note you shouldn use sprintf, there are overflow as well as security issues with it:
http://www.gtkforums.com/viewtopic.php?f=3&t=178138&hilit=+sprintf

MBoerner · **Joined:** Fri Oct 26, 2012 10:49 am **Posts:** 22

Thank you, I read it, I will use asprintf.
MBoerner

errol · **Posted:** Mon Jan 07, 2013 7:05 am

Hello,

Please avoid the use of asprintf() in a GTK+ application. This function is an extension to GNU C, is non-standard and is only available for GNU C and FreeBSD. Your application would then be tied to only those two.

Use g_strdup_printf () instead which would be available under all versions of GTK+ in the Glib library. See the documentation at http://developer.gnome.org/glib/stable/glib-String-Utility-Functions.html#g-strdup-printf. Please also check the top of the page for extra information on formatting.

MBoerner · **Joined:** Fri Oct 26, 2012 10:49 am **Posts:** 22

Notified, thanks a lot!

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refresh boxes without new gtk_box_pack_start

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