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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="statusbar.c" xml:lang="pt-BR">
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<info>
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<title type="text">Statusbar (C)</title>
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<link type="guide" xref="c#buttons"/>
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<link type="seealso" xref="grid.c"/>
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<link type="seealso" xref="button.c"/>
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<revision version="0.1" date="2012-06-22" status="draft"/>
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<credit type="author copyright">
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<name>Monica Kochofar</name>
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<email its:translate="no">monicakochofar@gmail.com</email>
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<years>2012</years>
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</credit>
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<desc>Report messages of minor importance to the user</desc>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Rafael Ferreira</mal:name>
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<mal:email>rafael.f.f1@gmail.com</mal:email>
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<mal:years>2013</mal:years>
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</mal:credit>
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</info>
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<title>Statusbar</title>
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<media type="image" mime="image/png" src="media/statusbar3.png"/>
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This statusbar is used to demonstrate how messages are stacked in a last-in-first-out order. The message at the top of the stack is always the one displayed.
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#include <gtk/gtk.h>
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/*Callback function in which pushes an item onto the statusbar*/
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static void
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push_item (GtkWidget *widget,
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gpointer data)
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{
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GtkWidget *status_bar = data;
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/*Create a context id, which is used to uniquely identify
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*the source of a message*/
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guint context_id = gtk_statusbar_get_context_id (GTK_STATUSBAR (status_bar),
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"Statusbar example");
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/*Count is used to keep track of the amount of items
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the user is pushing/popping*/
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static int count = 1;
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char hold_output[20];
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/*This is a safer form of the standard sprintf () function. The output is
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guaranteed in this case to not exceed 20 characters, and the result is stored
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into the 'hold_output' variable*/
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g_snprintf (hold_output, 20, "Item %d", count++);
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gtk_statusbar_push (GTK_STATUSBAR (status_bar),
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context_id,
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hold_output);
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}
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/*Callback function that is used to pop an item off the statusbar*/
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static void
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pop_item (GtkWidget *widget,
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gpointer data )
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{
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GtkWidget *status_bar = data;
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guint context_id = gtk_statusbar_get_context_id (GTK_STATUSBAR (status_bar),
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"Statusbar example");
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gtk_statusbar_pop (GTK_STATUSBAR (status_bar), context_id);
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}
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static void
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activate (GtkApplication *app,
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gpointer user_data)
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{
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GtkWidget *grid;
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GtkWidget *window;
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GtkWidget *status_bar;
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GtkWidget *pop_button;
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GtkWidget *push_button;
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/*Create a window with a title, border width, and a default size**/
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window = gtk_application_window_new (app);
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gtk_window_set_default_size (GTK_WINDOW (window), 220, 100);
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gtk_window_set_title (GTK_WINDOW (window), "Statusbar Example");
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gtk_container_set_border_width (GTK_CONTAINER(window), 10);
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/*Create the status bar, which is held in the global variable*/
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status_bar = gtk_statusbar_new ();
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/*Create the buttons with labels*/
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push_button = gtk_button_new_with_label ("push item");
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pop_button = gtk_button_new_with_label ("pop last item");
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/*Create the grid, and attach the buttons/statusbar accordingly*/
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grid = gtk_grid_new ();
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gtk_grid_attach (GTK_GRID (grid), push_button, 0,1,1,1);
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gtk_grid_attach (GTK_GRID (grid), pop_button, 0,2,1,1);
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gtk_grid_attach (GTK_GRID (grid), status_bar, 0,3,1,1);
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/*Connecting the clicked signals to the corresponding callback functions*/
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g_signal_connect (GTK_BUTTON (push_button), "clicked",
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G_CALLBACK (push_item), status_bar);
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g_signal_connect (GTK_BUTTON (pop_button), "clicked",
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G_CALLBACK (pop_item), status_bar);
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/*Attach the grid holding the child widgets onto the window, and show all*/
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gtk_container_add (GTK_CONTAINER (window), grid);
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gtk_widget_show_all (window);
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}
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int
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main (int argc, char **argv)
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{
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GtkApplication *app;
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int status;
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app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
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g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
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status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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}
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In this sample we used the following:
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<list>
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<item><link href="http://developer.gnome.org/gtk3/3.4/GtkApplication.html">GtkApplication</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/3.4/GtkWindow.html">GtkWindow</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/stable/GtkStatusbar.html">GtkStatusBar</link> </item>
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<item><link href="http://developer.gnome.org/glib/stable/glib-String-Utility-Functions.html#g-snprintf">String Utility Functions</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/stable/GtkGrid.html">GtkGrid</link> </item>
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</list>
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</page>
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