Question

我有一个简单的GTK程序，可以创建树视图：

static GtkTreeModel *
create_and_fill_model (void)
{
  GtkListStore  *store;
  GtkTreeIter    iter;

  store = gtk_list_store_new (NUM_COLS, G_TYPE_STRING, G_TYPE_UINT);

  /*here is some code adding rows using
    gtk_list_store_append
    gtk_list_store_set*/

  return GTK_TREE_MODEL (store);
}

static GtkWidget *
create_view_and_model (void)
{
  GtkCellRenderer     *renderer;
  GtkTreeModel        *model;
  GtkWidget           *view;

  view = gtk_tree_view_new ();

  renderer = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes 
       (GTK_TREE_VIEW(view),-1,"Name",renderer,"text", COL_NAME,NULL);

  renderer = gtk_cell_renderer_text_new ();
  gtk_tree_view_insert_column_with_attributes 
       (GTK_TREE_VIEW(view),-1,"Age",renderer,"text", COL_AGE,NULL);

  model = create_and_fill_model ();

  gtk_tree_view_set_model (GTK_TREE_VIEW (view), model);

  g_object_unref (model);

  return view;
}


int
main (int argc, char **argv)
{
  //usual stuff

  view = create_view_and_model ();

  gtk_container_add (GTK_CONTAINER (window), view);

  //usual stuff
}

有人可以告诉我现在如何更改此树视图的内容？我是否必须再次创建“视图”对象？或者我应该打电话 gtk_tree_view_set_model与新模型？

Answer 1

要更改GtkTreeView的内容，您必须使用该模型。在你的功能中：

static GtkTreeModel *
create_and_fill_model (void)
{
  GtkListStore  *store;
  GtkTreeIter    iter;

  store = gtk_list_store_new (NUM_COLS, G_TYPE_STRING, G_TYPE_UINT);

  /*here is some code adding rows using
    gtk_list_store_append
    gtk_list_store_set*/

  return GTK_TREE_MODEL (store);
}

它评论了你应该追加数据的位置，检索GtkTreeIter并使用给定的迭代器和函数gtk_list_store_set设置数据。

您省略了列的枚举器，但从模型GtkListStore创建中可以看出，您将有2列，一列包含字符串，另一列包含无符号整数。 GtkTreeModel是存储（树存储和列表存储）实现的接口。

GtkTreeView遵循MVC（模型视图控制器）模式，因此视图将反映模型中的视图，模型可以具有许多视图。想象一下文件浏览器，其中模型包含有关文件的信息，但您可以拥有多个视图，图标视图或列表视图。

以下是一个示例，与您展示的示例非常相似：

#include <gtk/gtk.h>

enum
{
  COL_FIRST_NAME = 0,
  COL_AGE,
  NUM_COLS
} ;

static GtkTreeModel *
create_and_fill_model (void)
{
  GtkListStore  *liststore;
  GtkTreeIter   iter;

  liststore = gtk_list_store_new(NUM_COLS, G_TYPE_STRING, G_TYPE_UINT);

  gtk_list_store_append(liststore, &iter);
  gtk_list_store_set(liststore, &iter,
                     COL_FIRST_NAME, "Joe",
                     COL_AGE, 20,
                     -1);

  gtk_list_store_append(liststore, &iter);
  gtk_list_store_set(liststore, &iter,
                     COL_FIRST_NAME, "Jane",
                     COL_AGE, 24,
                     -1);

  return GTK_TREE_MODEL(liststore);
}

static GtkWidget *
create_view_and_model (void)
{
  GtkTreeViewColumn   *col;
  GtkCellRenderer     *renderer;
  GtkWidget           *view;
  GtkTreeModel        *model;

  view = gtk_tree_view_new();

  /* --- Column #1 --- */

  col = gtk_tree_view_column_new();

  gtk_tree_view_column_set_title(col, "First Name");

  /* pack tree view column into tree view */
  gtk_tree_view_append_column(GTK_TREE_VIEW(view), col);

  /* New text renderer */
  renderer = gtk_cell_renderer_text_new();

  /* pack cell renderer into tree view column */
  gtk_tree_view_column_pack_start(col, renderer, TRUE);

  /* Set view column to model column */
  gtk_tree_view_column_set_attributes(col, renderer, "text", COL_FIRST_NAME, NULL);


  /* --- Column #2 --- */

  col = gtk_tree_view_column_new();

  gtk_tree_view_column_set_title(col, "Age");

  /* pack tree view column into tree view */
  gtk_tree_view_append_column(GTK_TREE_VIEW(view), col);

  /* New text renderer */
  renderer = gtk_cell_renderer_text_new();

  /* pack cell renderer into tree view column */
  gtk_tree_view_column_pack_start(col, renderer, TRUE);

  /* Set view column to model column */
  gtk_tree_view_column_set_attributes(col, renderer, "text", COL_AGE, NULL);

  model = create_and_fill_model();

  gtk_tree_view_set_model(GTK_TREE_VIEW(view), model);

  g_object_unref(model); /* destroy model automatically with view */

  gtk_tree_selection_set_mode(gtk_tree_view_get_selection(GTK_TREE_VIEW(view)),
                              GTK_SELECTION_NONE);

  return view;
}


int
main (int argc, char **argv)
{
  GtkWidget *window;
  GtkWidget *view;

  gtk_init(&argc, &argv);

  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  g_signal_connect(window, "delete_event", gtk_main_quit, NULL); /* dirty */

  view = create_view_and_model();

  gtk_container_add(GTK_CONTAINER(window), view);

  gtk_widget_show_all(window);

  gtk_main();

  return 0;
}

注意我们如何在create_and_fill_model函数中向模型（GtkListStore）添加数据：

  ...
  gtk_list_store_append(liststore, &iter);
  gtk_list_store_set(liststore, &iter,
                     COL_FIRST_NAME, "Joe",
                     COL_AGE, 20,
                     -1);
  ...

还检查我们如何将视图列中的数据绑定到模型列：

gtk_tree_view_column_set_attributes(col, renderer, "text", COL_FIRST_NAME, NULL);

其中col是第一个包含CellRendererText renderer的列。

使用（命名文件main.c）编译给定示例：

gcc -o main main.c `pkg-config --cflags --libs gtk+-3.0`

结果应该是这样的：

更改GTK树视图的内容

1 个答案: