GTK+, Hello World

It is not really a hello world application, but since it is my first experience with GTK+ I've decided to use that "familiar" expresion in the title of this post. Here you have the code:

main.c

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


/*
* Function launching the View
*/
void initUI(int argc, char** argv);

/*
* Close window signal handler
*/
void destroy(GtkWidget * widget,gpointer data);

/*
* Login Callback
*/
void login(GtkWidget * widget,gpointer data);

/*
* Application's entry point
*/

int main(int argc, char**argv){
 g_print("INIT APPLICATION\n");
 initUI(argc,argv);
 return 0;
}

void initUI(int argc, char** argv){

 // Initialize GTK
  gtk_init(&argc,&argv);

 // Create the main window Widget
  GtkWidget * mainWindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);

 // Set the window title, default size and position (Centered)
  gtk_window_set_title(GTK_WINDOW(mainWindow),"Login");
 gtk_window_set_default_size(GTK_WINDOW(mainWindow),250,100);
 gtk_window_set_position(GTK_WINDOW(mainWindow),GTK_WIN_POS_CENTER);

 /* When resize is off some of the properties are interpreted in weird ways */
 //gtk_window_set_resizable(GTK_WINDOW(mainWindow),FALSE);

 // Set the destroy signal handler, that will be called when the
 // window is closed
  g_signal_connect(G_OBJECT(mainWindow),"destroy",G_CALLBACK(destroy),NULL);

 // Now is time to add some panels to layout the content in the window
  GtkWidget * topVPanel = gtk_vbox_new(FALSE,10);
 GtkWidget * buttonsHPanel = gtk_hbox_new(FALSE,0);
 GtkWidget * topHPanel = gtk_hbox_new(FALSE,20);
 GtkWidget * labelsVPanel = gtk_vbox_new(FALSE,0);
 GtkWidget * textsVPanel = gtk_vbox_new(FALSE,0);

 // Now let's link the panels to each other
  gtk_box_pack_start(GTK_BOX(topVPanel),topHPanel, FALSE,FALSE,0);
 gtk_box_pack_start(GTK_BOX(topVPanel),buttonsHPanel,FALSE,FALSE,0);
 gtk_box_pack_start(GTK_BOX(topHPanel),labelsVPanel,FALSE,FALSE,0);
 gtk_box_pack_start(GTK_BOX(topHPanel),textsVPanel,FALSE,FALSE,0);

 // Declare and add the buttons
  GtkWidget * loginButton = gtk_button_new();
 GtkWidget * cancelButton = gtk_button_new();
 gtk_button_set_label(GTK_BUTTON(loginButton),"Login");
 gtk_button_set_label(GTK_BUTTON(cancelButton),"Cancel");

 // Link the login button with the login signal handler
  g_signal_connect(G_OBJECT(loginButton),"clicked",G_CALLBACK(login),NULL);
 g_signal_connect(G_OBJECT(cancelButton),"clicked",G_CALLBACK(destroy),NULL);
 gtk_box_pack_end(GTK_BOX(buttonsHPanel),cancelButton,FALSE,FALSE,0);
 gtk_box_pack_end(GTK_BOX(buttonsHPanel),loginButton,FALSE,FALSE,0);

 // Declare and add the labels
  GtkWidget * userLabel = gtk_label_new("User");
 GtkWidget * passLabel = gtk_label_new("Password");
 gtk_label_set_width_chars(GTK_LABEL(userLabel),10);
 gtk_label_set_width_chars(GTK_LABEL(passLabel),10);
 gtk_misc_set_alignment(GTK_MISC(userLabel),0,0);
 gtk_misc_set_alignment(GTK_MISC(passLabel),0,0);
 gtk_box_pack_start(GTK_BOX(labelsVPanel),userLabel,TRUE,TRUE,0);
 gtk_box_pack_start(GTK_BOX(labelsVPanel),passLabel,TRUE,TRUE,0);


 // Declare and add the text boxes
  GtkWidget * userText = gtk_entry_new();
 GtkWidget * passText = gtk_entry_new();
 gtk_box_pack_start(GTK_BOX(textsVPanel),userText,TRUE,TRUE,0);
 gtk_box_pack_start(GTK_BOX(textsVPanel),passText,TRUE,TRUE,0);

 // Add the top box to the window
  gtk_container_add(GTK_CONTAINER(mainWindow),topVPanel);

 gtk_widget_show(topVPanel);
 gtk_widget_show(buttonsHPanel);
 gtk_widget_show(topHPanel);
 gtk_widget_show(labelsVPanel);
 gtk_widget_show(textsVPanel);
 gtk_widget_show(loginButton);
 gtk_widget_show(cancelButton);
 gtk_widget_show(userLabel);
 gtk_widget_show(passLabel);
 gtk_widget_show(userText);
 gtk_widget_show(passText);
 gtk_widget_show(mainWindow);
 //Init the GTK loop
  gtk_main();
}


void destroy(GtkWidget * widget,gpointer data){
 gtk_main_quit();
}

void login(GtkWidget * widget,gpointer data){
 // Create the main window Widget
  GtkWidget * messageWindow = gtk_window_new(GTK_WINDOW_TOPLEVEL);
 GtkWidget * label = gtk_label_new("Trying to log in the system");

 // Set the window title
  gtk_window_set_title(GTK_WINDOW(messageWindow),"MESSAGE");
 gtk_window_set_default_size(GTK_WINDOW(messageWindow),200,50);
 gtk_window_set_modal(GTK_WINDOW(messageWindow),TRUE);
 gtk_window_set_position(GTK_WINDOW(messageWindow),GTK_WIN_POS_CENTER);

 //gtk_window_set_resizable(GTK_WINDOW(messageWindow),FALSE);
  gtk_container_add(GTK_CONTAINER(messageWindow),label);
 gtk_widget_show(label);
 gtk_widget_show(messageWindow);
}

Compile with:

>>gcc -o a.out main.c `pkg-config --libs --cflags gtk+-2.0`

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