小贝子编程

C - 来自列表存储树视图的 GTK 处理事件



我的代码如下

   #include <gtk/gtk.h>
    #include <glib.h>
    #include <stdlib.h>
    GtkWidget *scrolledwindow;
    struct param
{
    GtkWidget*parent;
    GtkWidget*newChild;
};
GtkWidget * init_tree();
GtkWidget * init_tree2();
static void destroy(GtkWidget *widget, gpointer data)
{
  gtk_main_quit();
}
static void replace_tab(GtkTreeView *tree_view, GtkTreePath *path, GtkTreeViewColumn *column, gpointer user_data)
{
      struct param* parameters = (struct param*)user_data;
      gtk_container_remove(GTK_CONTAINER(parameters->parent), (GtkWidget*)tree_view);
      gtk_container_add(GTK_CONTAINER(parameters->parent), init_tree2()/*parameters->newChild*/);
}

    GtkWidget * init_tree()
    {
        GtkListStore *liststore = gtk_list_store_new(1, G_TYPE_STRING);
        GtkTreeIter treeiter;
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Mandriva", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Aptosid", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "OpenSuSE", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Linux Mint", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Arch Linux", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Mandriva", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Aptosid", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "OpenSuSE", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Linux Mint", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Arch Linux", -1);
     GtkWidget *treeview = gtk_tree_view_new_with_model(GTK_TREE_MODEL(liststore));
        GtkCellRenderer *cellrenderertext = gtk_cell_renderer_text_new();
        GtkTreeViewColumn *treeviewcolumn = gtk_tree_view_column_new_with_attributes("Distributions",
                                                                                     cellrenderertext,
                                                                                     "text", 0,
                                                                                     NULL);
        gtk_tree_view_append_column(GTK_TREE_VIEW(treeview), treeviewcolumn);
        return treeview;
    }
    GtkWidget * init_tree2()
    {
        GtkListStore *liststore = gtk_list_store_new(1, G_TYPE_STRING);
        GtkTreeIter treeiter;
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "a", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "b", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "c", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "d", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "e", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "f", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Aptosid", -1);
     gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "OpenSuSE", -1);
        gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Linux Mint", -1);
    gtk_list_store_append(liststore, &treeiter);
        gtk_list_store_set(liststore, &treeiter, 0, "Arch Linux", -1);
        GtkWidget *treeview = gtk_tree_view_new_with_model(GTK_TREE_MODEL(liststore));
        GtkCellRenderer *cellrenderertext = gtk_cell_renderer_text_new();
        GtkTreeViewColumn *treeviewcolumn = gtk_tree_view_column_new_with_attributes("Distributions",
                                                                                     cellrenderertext,
                                                                                     "text", 0,
                                                                                     NULL);
        gtk_tree_view_append_column(GTK_TREE_VIEW(treeview), treeviewcolumn);
        return treeview;
    }
    int main(int argc, char *argv[])
    {
      gtk_init(&argc, &argv);
      GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
      gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
      g_signal_connect(window, "destroy", G_CALLBACK(destroy), NULL);
      GtkWidget *notebook = gtk_notebook_new();
      gtk_container_add(GTK_CONTAINER(window), notebook);

      int count;
      gchar *text;
      for (count = 1; count <= 5; count++)
        {
          GtkWidget *vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);
          text = g_strdup_printf("Page %d", count);
    GtkWidget *label = gtk_label_new(text);
          GtkWidget *scrolledwindow = gtk_scrolled_window_new(NULL, NULL);
          gtk_widget_set_size_request(scrolledwindow, -1, 200);
          gtk_container_add(GTK_CONTAINER(vbox), scrolledwindow);
          GtkWidget *textview = gtk_text_view_new();
          /* gtk_container_add(GTK_CONTAINER(scrolledwindow), textview); */
          GtkWidget* treeview = init_tree();
          GtkWidget* treeview2 = init_tree2();
struct param* parameters = malloc(sizeof(struct param));
      parameters->parent = scrolledwindow;
      parameters->newChild= treeview2;
          g_signal_connect(treeview, "row-activated", G_CALLBACK(replace_tab),(gpointer)parameters);
          gtk_container_add(GTK_CONTAINER(scrolledwindow), treeview);
          gtk_notebook_append_page(GTK_NOTEBOOK(notebook), vbox, label);
        }
      gtk_widget_show_all(window);
      gtk_main();
      return 0;
    }

我有 2 个列表存储实例 treview1 和树视图 2。显示 1 个树视图 1。双击任何列表存储项时，它会生成"行激活"信号。该信号与功能"replace_tab"G_CALLBACK相连。func "replace_tab" 需要 4 个参数 - 父小部件、要从父小部件中删除的小部件、要添加到父项的小部件和 gpointer 数据。如何将参数传递给此函数。或者还有其他解决方案方法吗？

代码不好，但这不是问题，因此，要解决双击时不显示第二个树视图而不是第一个树视图的特定问题：

  1. 正如@Gerhardh所说，您需要将参数作为最后一个参数传递给回调，否则应用程序将在双击行时出现段错误：g_signal_connect(treeview, "row-activated", G_CALLBACK(replace_tab), parameters);
  2. 您必须在replace_tab函数中显示新的树视图：gtk_widget_show_all (GTK_WIDGET(parameters->parent));

您的代码具有上述建议：

#include <gtk/gtk.h>
#include <glib.h>
#include <stdlib.h>
GtkWidget * init_tree();
GtkWidget * init_tree2();
GtkWidget *scrolledwindow;
struct param
{
    GtkWidget*parent;
    GtkWidget*newChild;
};
static void destroy(GtkWidget *widget, gpointer data)
{
   gtk_main_quit();
}
static void replace_tab(GtkTreeView *tree_view, GtkTreePath *path, GtkTreeViewColumn *column, gpointer user_data)
{
   struct param* parameters = (struct param*)user_data;
   gtk_container_remove(GTK_CONTAINER(parameters->parent), (GtkWidget*)tree_view);
   gtk_container_add(GTK_CONTAINER(parameters->parent), init_tree2()/*parameters->newChild*/);
   gtk_widget_show_all (GTK_WIDGET(parameters->parent));
}

GtkWidget * init_tree()
{
  GtkListStore *liststore = gtk_list_store_new(1, G_TYPE_STRING);
  GtkTreeIter treeiter;
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "Mandriva", -1);
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "Aptosid", -1);
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "OpenSuSE", -1);
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "Linux Mint", -1);
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "Arch Linux", -1);
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "Mandriva", -1);
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "Aptosid", -1);
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "OpenSuSE", -1);
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "Linux Mint", -1);
  gtk_list_store_append(liststore, &treeiter);
  gtk_list_store_set(liststore, &treeiter, 0, "Arch Linux", -1);
  GtkWidget *treeview = gtk_tree_view_new_with_model(GTK_TREE_MODEL(liststore));
  GtkCellRenderer *cellrenderertext = gtk_cell_renderer_text_new();
  GtkTreeViewColumn *treeviewcolumn = gtk_tree_view_column_new_with_attributes("Distributions",
                                                                               cellrenderertext,
                                                                               "text", 0,
                                                                               NULL);
  gtk_tree_view_append_column(GTK_TREE_VIEW(treeview), treeviewcolumn);
  return treeview;
}
GtkWidget * init_tree2()
{
   GtkListStore *liststore = gtk_list_store_new(1, G_TYPE_STRING);
   GtkTreeIter treeiter;
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "a", -1);
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "b", -1);
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "c", -1);
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "d", -1);
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "e", -1);
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "f", -1);
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "Aptosid", -1);
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "OpenSuSE", -1);
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "Linux Mint", -1);
   gtk_list_store_append(liststore, &treeiter);
   gtk_list_store_set(liststore, &treeiter, 0, "Arch Linux", -1);
   GtkWidget *treeview = gtk_tree_view_new_with_model(GTK_TREE_MODEL(liststore));
   GtkCellRenderer *cellrenderertext = gtk_cell_renderer_text_new();
   GtkTreeViewColumn *treeviewcolumn = gtk_tree_view_column_new_with_attributes("Distributions",
                                                                               cellrenderertext,
                                                                               "text", 0,
                                                                               NULL);
   gtk_tree_view_append_column(GTK_TREE_VIEW(treeview), treeviewcolumn);
   return treeview;
}
int main(int argc, char *argv[])
{
   gtk_init(&argc, &argv);
   GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
   gtk_window_set_default_size(GTK_WINDOW(window), 200, 200);
   g_signal_connect(window, "destroy", G_CALLBACK(destroy), NULL);
   GtkWidget *notebook = gtk_notebook_new();
   gtk_container_add(GTK_CONTAINER(window), notebook);

   int count;
   gchar *text;
   for (count = 1; count <= 5; count++)
   {
      GtkWidget *vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5);
      text = g_strdup_printf("Page %d", count);
      GtkWidget *label = gtk_label_new(text);
      GtkWidget *scrolledwindow = gtk_scrolled_window_new(NULL, NULL);
      gtk_widget_set_size_request(scrolledwindow, -1, 200);
      gtk_container_add(GTK_CONTAINER(vbox), scrolledwindow);
      GtkWidget* treeview = init_tree();
      GtkWidget* treeview2 = init_tree2();
      struct param* parameters = malloc(sizeof(struct param));
      parameters->parent = scrolledwindow;
      parameters->newChild= treeview2;
      g_signal_connect(treeview, "row-activated", G_CALLBACK(replace_tab), parameters);
      gtk_container_add(GTK_CONTAINER(scrolledwindow), treeview);
      gtk_notebook_append_page(GTK_NOTEBOOK(notebook), vbox, label);
   }
   gtk_widget_show_all(window);
   gtk_main();
   return 0;
}

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