C语言 暂时用其他容器替换

Question

我目前正在编写一个GTK应用程序，由一个带有GtkListView和一个按钮的单个窗口组成。当用户按下按钮时，将出现一些表单，允许将新数据插入到列表中。

不是为表单打开一个新窗口，我希望它暂时取代GtkListView。我对GTK很陌生，所以我想知道是否有一种习惯的方法来做到这一点。

我目前的猜测是，我必须添加一个带有两个隐藏选项卡的笔记本，一个用于列表，一个用于表单。每当按下按钮时，我发出focus-tab信号切换到表单选项卡。

是否有更好的方法临时替换GtkListView

Answer 1

你不需要一个笔记本来创建临时的小部件，你可以使用一个简单的盒子我使用的是:

  # displaying the list view
  container = gtk.VBox()
  container.add(tree_view)
  # removing the treeview and adding a form
  container.remove(tree_view)
  container.add(form)
  form.show()

Answer 2

您可以尝试使用gtk_container_add &gtk_container_remove按钮的回调来实现这一点。将第一个视图添加到容器中。当用户点击按钮时，移除第一个视图&添加下一个。反之亦然。确保在添加到容器之前添加对小部件的引用，因为如果小部件从容器中移除&如果没有对小部件的引用，小部件将被销毁。这里有一个C语言的示例供您参考:

#include <gtk/gtk.h>
static GtkWidget *view0;
static GtkWidget *view1;
static GtkWidget *frame;
static int current_view_id;
static GtkWidget *
create_view0 (void)
{
  GtkWidget *scrolled_window = gtk_scrolled_window_new (NULL, NULL);
  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window),
                  GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
  GtkWidget *view0_content = gtk_label_new ("Here is first view");
  gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW
                     (scrolled_window), view0_content);
  gtk_widget_show_all (scrolled_window);
  return scrolled_window;
}
static GtkWidget *
create_view1 (void)
{
  GtkWidget *scrolled_window = gtk_scrolled_window_new (NULL, NULL);
  GtkWidget *view1_content = gtk_label_new ("Here is next view");
  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window),
                  GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
  gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW
                     (scrolled_window), view1_content);
  gtk_widget_show_all (scrolled_window);
  return scrolled_window;
}
static gboolean
change_view (GtkWidget * button, gpointer data)
{
  (void) data;
  if (current_view_id == 0)
    {
      gtk_button_set_label (GTK_BUTTON (button), "Prev");
      gtk_container_remove (GTK_CONTAINER (frame), view0);
      /* Need to add reference as container will own widget ref */
      /* If gtk_container_remove is called with widget's last ref, widget is destroyed */
      g_object_ref (view1);
      gtk_container_add (GTK_CONTAINER (frame), view1);
      current_view_id = 1;
    }
  else
    {
      gtk_button_set_label (GTK_BUTTON (button), "Next");
      gtk_container_remove (GTK_CONTAINER (frame), view1);
      /* Need to add reference as container will own widget ref */
      /* If gtk_container_remove is called with widget's last ref, widget is destroyed */
      g_object_ref (view0);
      gtk_container_add (GTK_CONTAINER (frame), view0);
      current_view_id = 0;
    }
  return FALSE;
}
int
main (void)
{
  GtkWidget *window;
  GtkWidget *vbox;
  GtkWidget *label;
  GtkWidget *button;
  gtk_init (NULL, NULL);
  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
  vbox = gtk_vbox_new (FALSE, 5);
  gtk_container_add (GTK_CONTAINER (window), vbox);
  frame = gtk_frame_new (" Sample for view change ");
  view0 = create_view0 ();
  view1 = create_view1 ();
  /* Need to add reference as container will own widget ref */
  /* If gtk_container_remove is called with widget's last ref, widget is destroyed */
  g_object_ref (view0);
  gtk_container_add (GTK_CONTAINER (frame), view0);
  label = gtk_label_new ("View change sample");
  button = gtk_button_new_with_label ("Next");
  g_signal_connect (button, "clicked", G_CALLBACK (change_view), NULL);
  gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);
  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
  gtk_widget_show_all (window);
  gtk_main ();
  return 0;
} 

希望这对你有帮助!