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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="progressbar.c" xml:lang="cs">
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<info>
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<title type="text">ProgressBar (C)</title>
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<link type="guide" xref="c#display-widgets"/>
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<link type="seealso" xref="spinner.c"/>
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<revision version="0.1" date="2012-06-16" 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>Widget, který graficky znázorňuje průběh</desc>
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</info>
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<title>ProgressBar</title>
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<media type="video" mime="application/ogv" src="media/progressbar_fill.ogv"/>
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Tento ProgressBar je po částech „vyplňován“, dokud lišta není plná.
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#include <gtk/gtk.h>
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static gboolean
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fill (gpointer user_data)
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{
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GtkWidget *progress_bar = user_data;
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/* Získá aktuální stav průběhu */
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gdouble fraction;
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fraction = gtk_progress_bar_get_fraction (GTK_PROGRESS_BAR (progress_bar));
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/* Zvýší stav lišty o 10% při každém zavolání této funkce */
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fraction += 0.1;
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/* Vyplní lištu novým podílem */
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gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (progress_bar), fraction);
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/* Zajistí, že podíl nepřekročí hodnotu 1,0 */
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if (fraction < 1.0)
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return TRUE;
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return FALSE;
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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 *window;
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GtkWidget *progress_bar;
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gdouble fraction = 0.0;
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/* Vytvoří okno s názvem, šířkou okraje a výchozí velikostí */
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window = gtk_application_window_new (app);
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gtk_window_set_title (GTK_WINDOW (window), "ProgressBar Example");
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gtk_window_set_default_size (GTK_WINDOW (window), 220, 20);
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/* Vytvoří ukazatel průběhu a přidá jej do okna */
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progress_bar = gtk_progress_bar_new ();
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gtk_container_add (GTK_CONTAINER (window), progress_bar);
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/* Vyplní zadaný podíl lišty. Musí být v rozmezí 0,0 až 1,0 včetně */
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gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (progress_bar), fraction);
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/* Použije každých 500 milisekund funkci vyplňující lištu */
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g_timeout_add (500, fill, GTK_PROGRESS_BAR (progress_bar));
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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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V této ukázce se používá následující:
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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/GtkProgressBar.html">GtkProgressBar</link> </item>
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<item><link href="http://developer.gnome.org/glib/stable/glib-The-Main-Event-Loop.html#g-timeout-add">G_Timeout</link> </item>
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</list>
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</page>
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