使用 gtk c++ 更新多个进度条

Question

我需要输出 i 个进度条并全部更新。但只有最后一个更新了 i 次。这是代码：

static void calculaPi (GtkButton * boton,  Datos * dDatos){
    const char * threads;
    GtkWidget * barra, *bot2, *button, *progress, *vbox;
    threads = gtk_entry_get_text(GTK_ENTRY(dDatos->dthreads ));
    gint ithreads  = 1;
    ithreads = atoi(threads);
    barra = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title((GtkWindow *) barra, "Loteria de Threads");
    gtk_window_set_default_size(GTK_WINDOW(barra), 300, ithreads*30);
    gtk_window_set_position(GTK_WINDOW(barra), GTK_WIN_POS_CENTER);
    button = gtk_button_new_with_label ("Click me!");
    vbox = gtk_vbox_new (FALSE, 5);
    gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 5);
    gtk_container_add (GTK_CONTAINER (barra), vbox);  
    for (gint i = 1 ; i <=  ithreads; i++) {  
       progress = gtk_progress_bar_new ();
       gtk_box_pack_start (GTK_BOX (vbox), progress, FALSE, FALSE, 5);
       g_object_set_data (G_OBJECT (barra), "pbar", (gpointer) progress);
       g_signal_connect (G_OBJECT (button), "clicked",
                   G_CALLBACK (button_clicked), (gpointer) barra);
    }
    bot2 = gtk_button_new_with_label("Salir");
    gtk_box_pack_start (GTK_BOX (vbox), bot2, FALSE, FALSE, 5);
    gtk_widget_set_size_request(bot2, 100, 35);
    g_signal_connect (G_OBJECT (bot2), "clicked",
    G_CALLBACK (destroy),
    G_OBJECT (barra));
        gtk_widget_show_all(barra);
    gtk_main();
}
static void
button_clicked (GtkButton *button,
                GtkWidget *barra)
{
  GtkProgressBar *progress;
  gdouble percent = 0.0;
  gtk_widget_set_sensitive (GTK_WIDGET (button), FALSE);
  progress = GTK_PROGRESS_BAR (g_object_get_data (G_OBJECT (barra), "pbar"));
  while (percent <= 100.0)
  {
    gchar *message = g_strdup_printf ("%.0f%% Complete", percent);
    gtk_progress_bar_set_fraction (progress, percent / 100.0);
    gtk_progress_bar_set_text (progress, message);

    while (gtk_events_pending ())
      gtk_main_iteration ();

    g_usleep (500000);
    percent += 5.0;
  }

}

Answer 1

用这一行：

g_object_set_data (G_OBJECT (barra), "pbar", (gpointer) progress);

您在每次循环迭代时覆盖“pbar”数据条目的先前值。当您稍后在button_clicked() 中检索它时，您将获得最后一个设置值，即最后一个进度条。

在这种特殊情况下，您可以将 progress 小部件作为用户数据传递（并删除 g_object_[gs]et_data() 调用）以进行 button_clicked() 回调：无论如何，该函数不会将当前的 barra 窗口用于其他任何事情。

以更一般的方式，您应该学习如何将自己的结构用于用户数据参数。一种常见的方法是为给定的顶级类型声明和使用一个结构，并存储指向您需要从其中的回调访问的小部件的指针。