gtk-get 在列表存储树视图中单击了哪个项目

Question

我想获取在树视图中单击的导致“行激活”事件的项目。我在树视图中有一个列表存储。单击其中的任何项目会显示另一个列表。但我怎么知道哪个项目被点击了呢？我如何找到它？代码-

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, "Register", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "New Configuration", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Edit Configuration", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Delete Configuration", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Add location to turn-off place list", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Disable Turn-off Places", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Enable Turn-off Places", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Disable Distance", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Enable Distance", -1);
    gtk_list_store_append(liststore, &treeiter);
    gtk_list_store_set(liststore, &treeiter, 0, "Factory Reset", -1);
    gtk_list_store_append(liststore, &treeiter);
    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("Settings",
                                                                                 cellrenderertext,
                                                                                 "text", 0,
                                                                                 NULL);
    gtk_tree_view_append_column(GTK_TREE_VIEW(treeview), treeviewcolumn);

    return treeview;
}

static void replace_tab(GtkTreeView *tree_view, GtkTreePath *path, GtkTreeViewColumn *column, gpointer user_data)
{
..........
}

int main(...)
{
....
g_signal_connect(treeview, "row-activated", G_CALLBACK(replace_tab), (gpointer) parameters);

.....
}

Answer 1

treeview双击 ( )进行选择的最常见方法row-activated是：

1. 使用row-activated回调中的变量

signal的信号处理程序row-activated是：

void
user_function (GtkTreeView       *tree_view,
               GtkTreePath       *path,
               GtkTreeViewColumn *column,
               gpointer           user_data)

我们可以使用公开的变量从模型中检索数据；从GtkTreePath path我们得到GtkTreeIter iter，从 ，GtkTreeView treeview我们可以得到GtkTreeModel model。有了model和 ，iter我们就可以从 ; 中检索数据model；例如。在您的replace_tab信号处理程序中，添加以下内容：

static void replace_tab(GtkTreeView *tree_view, GtkTreePath *path, GtkTreeViewColumn *column, gpointer user_data)
{
   gchar *string;
   GtkTreeIter iter;
   GtkTreeModel *model = gtk_tree_view_get_model (tree_view);
   gtk_tree_model_get_iter(model, &iter, path); 
   gtk_tree_model_get (model, &iter, 0, &string, -1);
   g_print ("activated: %s\n", string);
   ...

 }

这应该打印激活行中的文本

2.使用GtkTreeSelection

另一种选择是使用GtkTreeSelection我们可以从其自身检索的内容GtkTreeView。此步骤允许我们提取选定的内容iter（树视图上的单个选择），我们将从中获取数据model；例如，在您的replace_tab信号处理程序中，添加以下内容：

static void replace_tab(GtkTreeView *tree_view, GtkTreePath *path, GtkTreeViewColumn *column, gpointer user_data)
{ 
   gchar *string;
   GtkTreeIter iter;
   GtkTreeSelection *selection;
   GtkTreeModel *model = gtk_tree_view_get_model (tree_view);

   selection = gtk_tree_view_get_selection (tree_view);
   gtk_tree_selection_get_selected (selection, &model, &iter); 
   gtk_tree_model_get (model, &iter, 0, &string, -1);
   g_print ("activated: %s\n", string);
   ...
}

结论：

选项 1) 更简单、更干净、更直接。通常 2) 它用于通过changed发出的信号获取选择更改GtkTreeSelection。