Question

在我向GTK树视图添加一些项目之后，我需要从代码中选择列表中的第一项来激活treeviewcursorchanged事件，即：当点击树视图项时。我需要选择第一个树视图项。但是没有选择事件。我用字符串填充树视图

    liststore = new ListStore (typeof(string));
    treeview1.Model = liststore;

Answer 1

您必须使用与Gtk.TreeSelection相关联的Gtk.TreeView。要选择第一行，请按以下步骤操作：

Gtk.TreeIter iter;
if (liststore.GetIterFirst(out iter))
    treeview1.Selection.SelectIter(iter);

以下是创建列表视图/模型的完整示例，向选择更改事件添加信号处理程序，然后将第一行设置为选中：

var view = new Gtk.TreeView();
var cell = new Gtk.CellRendererText();
var col1 = new Gtk.TreeViewColumn();
col1.Title = "Column 1"
col1.PackStart(cell, true);
col1.AddAttribute(cell, "text", 0);

view.AppendColumn(col1);

var model = new Gtk.ListStore(typeof(string));
model.AppendValues("AAA");
model.AppendValues("BBB");
model.AppendValues("CCC");

view.Model = model;

// This is the selection changed handler: I use a lambda but
// it is as easy to use a delegate `Changed` is a standard C#
// event.
view.Selection.Changed += (sender, e) => {
    Console.WriteLine("SELECTION WAS CHANGED");
    Gtk.TreeIter selected;
    if (view.Selection.GetSelected(out selected)) {
        Console.WriteLine("SELECTED ITEM: {0}", model.GetValue(selected, 0)));
    }
};

Gtk.TreeIter iter;
if (model.GetIterFirst(out iter))
     view.Selection.SelectIter(iter);

Answer 2

GtkTreeView中的选择逻辑被分成了自己的类GtkTreeSelection。每个GtkTreeView都有自己的GtkTreeSelection，可通过gtk_tree_view_get_selection()获得。

获得GtkTreeSelection后，您需要做的只是获取要选择的行的GtkTreeIter并致电gtk_tree_selection_select_iter()。您还可以构建GtkTreePath并选择gtk_tree_selection_select_path()。

您如何获得GtkTreeIter或GtkTreePath取决于您。 These are the methods that apply to GtkTreePaths and GtkTreeModels. GtkListStore也是GtkTreeModel和has its own methods。

从代码中选择GTK Treeview项

2 个答案: