GTK+ Forums

thunar · Familiar Face Joined: 15 Feb 2007 Posts: 6

Hello,
I'am new to GTK.
I would like to open a new window, when a button is clicked to show the progress to the user.
But the window apperas at the end of the whole if part. Why?
How can I show to window at the beginning of the if part?

Code: (Plaintext)
1 2 3 4 5 6 7 8	if(error==0) { GladeXML gxml_progress = NULL; gxml_progress = glade_xml_new (GLADE_FILE, "progress_window", NULL); GtkWidget progress_window = glade_xml_get_widget(gxml2, "progress_window"); do some work... }

Thank you

openldev · Posted: Fri Feb 16, 2007 12:33 am Post subject:

You just have to call gtk_widget_show_all() on the widget.

thunar · Familiar Face Joined: 15 Feb 2007 Posts: 6

Thank you for your answer, but the same effect with gtk_widget_show_all().
So I will post some more code to explain the problem.

Code: (Plaintext)

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GladeXML *gxml = NULL; //Global var, so that I have access from the other functions to gxml

int main (int argc, char *argv[]) {
GtkWidget *app_window = NULL;
gtk_init (&argc, &argv);
gxml = glade_xml_new (GLADE_FILE, "app_window", NULL);
g_assert (gxml);
app_window = glade_xml_get_widget (gxml, "app_window");
glade_xml_signal_connect_data (gxml, "on_button_go_clicked",
G_CALLBACK (on_button_go_clicked), NULL);
g_signal_connect(G_OBJECT(app_window), "delete_event", G_CALLBACK(delete_event_cb), NULL);
g_signal_connect(G_OBJECT(app_window), "destroy", G_CALLBACK(destroy_cb), NULL);
gtk_main ();
return 0;
}

void some_other_functions() {

}

void on_button_go_clicked() {
//check if all things are ok, etc.
...
if(error==0) { //start with the task, when no error occured
GladeXML *gxml_progress = NULL;
gxml_progress = glade_xml_new (GLADE_FILE, "progress_window", NULL); //should show the window now
GtkWidget *progress_window = glade_xml_get_widget(gxml_progress, "progress_window");
//gtk_widget_show_all(progress_window); //no effect with show_all

..do some work...
sprintf(...);
system(...);
g_print("");
...and a lot more...
} //end from if part, the progress window now appears, but should appear at the beginning from the if block
} //end function

thank you

openldev · Posted: Sat Feb 17, 2007 12:20 am Post subject:

Ok. So, I put together a short example that was this exact thing and it was displayed for me. What doesn't make sense is that the dialog is visible at all if you don't set it that way.

There is one thing that you could try. For your progress window, go to the properties window in Glade and go to the "Common" tab. Under there, set "Visible" to Yes. This should force it to be visible initially. Also, you could put this loop right after you call gtk_widget_show_all():

Code: (Plaintext)
1 2	while (gtk_events_pending()) gtk_main_iteration();

This will process all pending events after you show the window before continuing with the rest of the code. It is commonly used to make sure that your user interface continues to update while something processor-intensive is done.

thunar · Familiar Face Joined: 15 Feb 2007 Posts: 6

Thank you very much for your answer.
The window now appears, if I use

Code: (Plaintext)
1 2 3 4	while (gtk_events_pending()) gtk_main_iteration();

but not the other widgets (labels, progress bar). Even if I use gtk_widget_show(label) or show_all.

So I put together this example:

sample.glade

Code: (Plaintext)

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

<glade-interface>

<widget class="GtkWindow" id="window1">
<property name="border_width">10</property>
<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">False</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>
<property name="focus_on_map">True</property>
<property name="urgency_hint">False</property>

<child>
<widget class="GtkButton" id="button1">
<property name="width_request">150</property>
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="label" translatable="yes">Run</property>
<property name="use_underline">True</property>
<property name="relief">GTK_RELIEF_NORMAL</property>
<property name="focus_on_click">True</property>
<signal name="clicked" handler="on_button1_clicked" last_modification_time="Mon, 19 Feb 2007 20:34:21 GMT"/>
</widget>
</child>
</widget>

<widget class="GtkWindow" id="window2">
<property name="border_width">10</property>
<property name="visible">True</property>
<property name="title" translatable="yes">window2</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">False</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>
<property name="focus_on_map">True</property>
<property name="urgency_hint">False</property>

<child>
<widget class="GtkVBox" id="vbox1">
<property name="visible">True</property>
<property name="homogeneous">False</property>
<property name="spacing">0</property>

<child>
<widget class="GtkLabel" id="label1">
<property name="visible">True</property>
<property name="label" translatable="yes">Progress window</property>
<property name="use_underline">False</property>
<property name="use_markup">False</property>
<property name="justify">GTK_JUSTIFY_LEFT</property>
<property name="wrap">False</property>
<property name="selectable">False</property>
<property name="xalign">0.5</property>
<property name="yalign">0.5</property>
<property name="xpad">0</property>
<property name="ypad">0</property>
<property name="ellipsize">PANGO_ELLIPSIZE_NONE</property>
<property name="width_chars">-1</property>
<property name="single_line_mode">False</property>
<property name="angle">0</property>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">False</property>
<property name="fill">False</property>
</packing>
</child>

<child>
<widget class="GtkProgressBar" id="progressbar1">
<property name="visible">True</property>
<property name="orientation">GTK_PROGRESS_LEFT_TO_RIGHT</property>
<property name="fraction">0</property>
<property name="pulse_step">0.10000000149</property>
<property name="ellipsize">PANGO_ELLIPSIZE_NONE</property>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">False</property>
<property name="fill">False</property>
</packing>
</child>

<child>
<widget class="GtkLabel" id="label2">
<property name="visible">True</property>
<property name="label" translatable="yes">progress_description</property>
<property name="use_underline">False</property>
<property name="use_markup">False</property>
<property name="justify">GTK_JUSTIFY_LEFT</property>
<property name="wrap">False</property>
<property name="selectable">False</property>
<property name="xalign">0.5</property>
<property name="yalign">0.5</property>
<property name="xpad">0</property>
<property name="ypad">0</property>
<property name="ellipsize">PANGO_ELLIPSIZE_NONE</property>
<property name="width_chars">-1</property>
<property name="single_line_mode">False</property>
<property name="angle">0</property>
</widget>
<packing>
<property name="padding">2</property>
<property name="expand">False</property>
<property name="fill">False</property>
</packing>
</child>
</widget>
</child>
</widget>

</glade-interface>

sample.c

Code: (Plaintext)

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#include <gtk/gtk.h>
#include <glade/glade.h>
#include <stdlib.h>

#define GLADE_FILE "sample.glade"

// functions
static gint delete_event_cb(GtkWidget* w, GdkEventAny* e, gpointer data);
static gint destroy_cb(GtkWidget* w, GdkEventAny* e, gpointer data);
static void on_button1_clicked(GtkButton *button, gpointer data);

int main (int argc, char *argv[])
{
GladeXML *gxml;

gtk_init (&argc, &argv);

//Create interface
gxml = glade_xml_new (GLADE_FILE, "window1", NULL);

GtkWidget *window1 = glade_xml_get_widget(gxml, "window1");

//connect signals
glade_xml_signal_connect_data (gxml, "on_button1_clicked",
G_CALLBACK (on_button1_clicked), NULL);

g_signal_connect(G_OBJECT(window1), "delete_event",
G_CALLBACK(delete_event_cb), NULL);

g_signal_connect(G_OBJECT(window1), "destroy",
G_CALLBACK(destroy_cb), NULL);

//show the window
//gtk_widget_show (window1);

//beginn loop
gtk_main ();

return 0;
}

static gint delete_event_cb(GtkWidget* w, GdkEventAny* e, gpointer data)
{
return 0;
}

static gint destroy_cb(GtkWidget* w, GdkEventAny* e, gpointer data)
{
gtk_main_quit();
return 0;
}

void
on_button1_clicked(GtkButton *button, gpointer data)
{
/* the button was clicked */
//Print out to console
g_print("Beginn break\n");

//Create the new "progress" window
GladeXML *gxml_progress = NULL;
gxml_progress = glade_xml_new (GLADE_FILE, "window2", NULL);

//show the window
GtkWidget *window2 = glade_xml_get_widget(gxml_progress, "window2");
gtk_widget_show_all(window2);

//show the label
//GtkWidget *label = glade_xml_get_widget(gxml_progress, "label1");
//gtk_widget_show(label);

while (gtk_events_pending())
gtk_main_iteration();

//Make 5 sec. break
system("sleep 5");
g_print("End break\n");
}

I compile it with:

Code: (Plaintext)
1 2 3	gcc -Wall -export-dynamic -g `pkg-config --cflags --libs gtk+-2.0` `pkg-config --cflags --libs libglade-2.0` -o sample sample.c

If I run the programm without gtk_events_pending... Then the window2 appears at the end from the 5 seconds. If I use it, then it appears at the beginning, but without the labels etc.
Or should I use something diffrent to open a new window?

Thank you

openldev · Posted: Mon Feb 19, 2007 11:12 pm Post subject:

You should use g_usleep(5000); to sleep for 5 seconds. The system() call interupts the application, but g_usleep() won't go until everything else in the application is processed.

thunar · Familiar Face Joined: 15 Feb 2007 Posts: 6

I quickly didn't found anything to make a break. But system("sleep 5") was more a placeholder, for the work I do in the apllication. There I make some system("pdftk ...) etc. But the problem I want to show with this example above, is when the new window appears and when not. So I needed the break to see the difference when I use gtk_events_pending or something else.
But it doesn't work as I expectet.

openldev · Posted: Tue Feb 20, 2007 1:12 pm Post subject:

Well, my advice would be to stay away from calls to system() and stay with GLib functions. They tend to block the main loop haphazardly. If you need to run an application on the user's system, use the g_spawn_*() family functions found at:

http://developer.gnome.org/doc/API/2.0/glib/glib-Spawning-Processes.html

thunar · Familiar Face Joined: 15 Feb 2007 Posts: 6

I replaced all my system() calls with g_spawn_command_line_sync(), and now it works :P :D

Thank you very much.

thunar · Familiar Face Joined: 15 Feb 2007 Posts: 6

I thought it works, but now I realized, it doesn't work. :( It worked on a Intel Pentium D 3.4 Ghz machine at work, but not on a Pentium 4 2.6Ghz machine.
So I took the example above and replaced the system(sleep 5) with g_usleep(5000000), and tried it again but the window always appears at the end of the break but it should appear at the beginning. What should I do to open the window properly?
With gtk_events_pending... it shows only the border from the window but not the labels etc.