Question

以下是gtktreeview由GtkListStore在 GTK + 中由C代码构建的iter。第一行是由 gtk_cell_renderer_text_new 构建的标头。接下来的行是内容。

假设有很多行，向下滚动时，如何在标题下面找到行的+----------+-----------+------------+----------------------+ |row ID |title 2 |title 3 |title 4 | | | | | | +----------+-----------+------------+----------------------+ | | | | | | 1 | | | | +----------+-----------+------------+----------------------+ | | | | | | 2 | | | | +----------+-----------+------------+----------------------+ | | | | | | 3 | | | | +----------+-----------+------------+----------------------+？例如，在初始时，标题下方的行的iter为0.向下滚动时，标题下方的行的iter可以是3或78或其他。请注意，标题下方的行可能会选择不。

我不知道：

首先，什么信号与动作相关联＆＃34;向下滚动＆＃34;？

其次，如何找到标题下方的行？

请帮忙。谢谢。

{{1}}

Answer 1

GtkTreeview实施GtkScrollable，因此您可以执行gtk_scrollable_get_vadjustment ()并在调整时连接到value-changed信号。

对于问题＃2，请查看gtk_tree_view_get_visible_range ()：start_path应该是第一个稍微可见的行的路径。

Answer 2

根据jku的回答，该问题的解决方案是：

void treeview_vadjustment_changed (GtkWidget *widget, gpointer data)
{
  GtkTreePath *start_path;

  if(gtk_tree_view_get_visible_range(treeview, &start_path, NULL))
  {
    gchar *str;
    GtkTreeIter start_iter, iter;
    GtkTreeModel *model = gtk_tree_view_get_model(treeview);
    if(gtk_tree_model_get_iter(model, &start_iter, start_path) && ACC_truss_get_truss_weight_iter (model, start_iter, &iter))
    {
      int who;
      GtkWidget *window = g_object_get_data(G_OBJECT(treeview), "parent_window");

      gtk_tree_model_get(model, &iter, TRUSS_MEM_AXIS_NAME, &str, -1);
      who = GPOINTER_TO_INT(g_object_get_data(G_OBJECT(model), "which_truss"));
      switch(who)
      {
    case 0:
      gtk_entry_set_text((GtkEntry *)g_object_get_data(G_OBJECT(window), "ACC_SDD_main_truss_curr"), str);  
      break;
    case 1:
      gtk_entry_set_text((GtkEntry *)g_object_get_data(G_OBJECT(window), "ACC_SDD_second_truss_curr"), str);  
      break;
      }
      g_free(str);
    }
  }
  gtk_tree_path_free(start_path);
}

  .
  .
  store = gtk_list_store_new(TRUSS_NUMS_MEM_SEC, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING);
  switch(who)
  {
    case 0:
      g_object_set_data(G_OBJECT(window), "ACC_main_truss_SDD_mem_tree_store", store);
      break;
    case 1:
      g_object_set_data(G_OBJECT(window), "ACC_second_truss_SDD_mem_tree_store", store);
      break;
  }

  model = GTK_TREE_MODEL(store);

  /* create tree view */
  treeview = gtk_tree_view_new_with_model(model);
  g_object_set_data(G_OBJECT(treeview), "parent_window", window);
  gtk_tree_view_set_rules_hint(GTK_TREE_VIEW(treeview), TRUE);
/*  gtk_tree_view_set_search_column(GTK_TREE_VIEW(treeview), COLUMN_DESCRIPTION);*/
  ACC_member_treeview_header_truss (GTK_TREE_VIEW(treeview), who);
  g_object_unref(model);
  gtk_widget_show(treeview);
  gtk_container_add(GTK_CONTAINER(scrolled_window), treeview);

  vadjustment = gtk_tree_view_get_vadjustment(GTK_TREE_VIEW(treeview));
  g_signal_connect(vadjustment, "value-changed", G_CALLBACK(treeview_vadjustment_changed), treeview);
  .
  .

gtktreeview（c代码）：找到标题下面的行的iter

2 个答案: