在您的原始代码中,您正确地将数据模型绑定到组合框,但您没有指定模型应该如何呈现(这是整个概念的一部分view
)model-view
。这就是GtkCellLayout应该提供的。
为了让您了解为什么这种增加的复杂性很有用,这里有一个示例,展示了如何使用模型来自定义背景(这是糟糕的用户体验,并且根据您的主题,背景颜色可以完全忽略)。我觉得最难的是避免内存泄漏,所以我在这方面加了一些评论:
#include <gtk/gtk.h>
int main(int argc, char **argv)
{
GtkWidget *window;
GtkListStore *liststore;
GtkWidget *combo;
GtkCellRenderer *column;
gtk_init(&argc, &argv);
liststore = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_STRING);
gtk_list_store_insert_with_values(liststore, NULL, -1,
0, "red",
1, "Don't install.",
-1);
gtk_list_store_insert_with_values(liststore, NULL, -1,
0, "green",
1, "This user only.",
-1);
gtk_list_store_insert_with_values(liststore, NULL, -1,
0, "yellow",
1, "All users.",
-1);
combo = gtk_combo_box_new_with_model(GTK_TREE_MODEL(liststore));
/* liststore is now owned by combo, so the initial reference can
* be dropped */
g_object_unref(liststore);
column = gtk_cell_renderer_text_new();
gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combo), column, TRUE);
/* column does not need to be g_object_unref()ed because it
* is GInitiallyUnowned and the floating reference has been
* passed to combo by the gtk_cell_layout_pack_start() call. */
gtk_cell_layout_set_attributes(GTK_CELL_LAYOUT(combo), column,
"cell-background", 0,
"text", 1,
NULL);
gtk_combo_box_set_active(GTK_COMBO_BOX(combo), 1);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_container_add(GTK_CONTAINER(window), combo);
/* Also combo is GInitiallyUnowned and it is now owned
by window after the gtk_container_add() call. */
gtk_widget_show_all(window);
gtk_main();
return 0;
}
但是,如果您打算在组合框中仅使用字符串,则可以通过利用GtkComboBoxText来精简代码:
#include <gtk/gtk.h>
int main(int argc, char **argv)
{
GtkWidget *window, *combo;
gtk_init(&argc, &argv);
combo = gtk_combo_box_text_new();
gtk_combo_box_text_append(GTK_COMBO_BOX_TEXT(combo), NULL, "Don't install.");
gtk_combo_box_text_append(GTK_COMBO_BOX_TEXT(combo), NULL, "This user only.");
gtk_combo_box_text_append(GTK_COMBO_BOX_TEXT(combo), NULL, "All users");
gtk_combo_box_set_active(GTK_COMBO_BOX(combo), 1);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_container_add(GTK_CONTAINER(window), combo);
gtk_widget_show_all(window);
gtk_main();
return 0;
}