gtkmm Append_column（TreeViewColumn）不显示任何内容

Question

我正在尝试用不同的颜色给TreeView的行上色。我在网上找到了以下示例，但由于某些原因，这些列没有出现，并且窗口保持空白。

我正在将c++与gtkmm3一起使用。

这里是代码：

#include <gtkmm.h>

class Columns : public Gtk::TreeModel::ColumnRecord
{
    public:
        Columns () { add (name); add (color); add(value); }
        Gtk::TreeModelColumn<Glib::ustring> name;
        Gtk::TreeModelColumn<int> value;
        Gtk::TreeModelColumn<Glib::ustring> color;  // a non-display column to store the color for each row
};

class MyWindow : public Gtk::Window
{
    public:
        MyWindow() :
            liststore (Gtk::ListStore::create (cols))
        {
            // add some random data to the model
            Gtk::TreeModel::Row row = *(liststore->append());
            row[cols.name] = "foo";
            row[cols.value] = 10;
            row[cols.color] = "blue";
            row = *(liststore->append());
            row[cols.name] = "bar";
            row[cols.value] = 20;
            row[cols.color] = "pink";
            row = *(liststore->append());
            row[cols.name] = "baz";
            row[cols.value] = 30;
            row[cols.color] = "green";

            treeview = Gtk::manage(new Gtk::TreeView (liststore));

            // create a view column for 'name' and associate the 'cell-background'
            // property of this column's cellrenderer with the value from the
            // 'color' column
            Gtk::TreeViewColumn viewcolumn("Name", cols.name);
            Gtk::CellRenderer* cellrenderer = viewcolumn.get_first_cell();
            viewcolumn.add_attribute(cellrenderer->property_cell_background (), cols.color);
            treeview->append_column (viewcolumn);

            // do the same for the 'value' column -- cellrenderers are per-
            // column, not per-row, so you have to do this for each column's
            // cellrenderer if you want to change the color of an entire row
            Gtk::TreeViewColumn viewcolumn2("Value", cols.value);
            cellrenderer = viewcolumn2.get_first_cell();
            viewcolumn2.add_attribute(cellrenderer->property_cell_background (), cols.color);
            treeview->append_column (viewcolumn2);

            // add it to the window
            add (*treeview);
            show_all();
        }

    private:
        Columns cols;
        Glib::RefPtr<Gtk::ListStore> liststore;
        Gtk::TreeView* treeview;
};

int main (int argc, char** argv)
{
    auto app = Gtk::Application::create(argc, argv, "org.gtkmm.example");
    MyWindow *myWindow = new MyWindow;
    return app->run(*myWindow);
}

我想念的是什么？我使用get_visible()进行了检查，并将参数设置为true。在编译和执行时没有错误或警告。

编辑：如果不是直接创建treeViewColumn并将其添加到TreeView中，而是直接添加名称和列引用，它将显示该列，但显然我不能以这种方式修改背景色。

要清楚，如果我这样做：

treeview->append_column ("Name", cols.name);

而不是：

Gtk::TreeViewColumn viewcolumn("Name", cols.name);
treeview->append_column (viewcolumn);

Answer 1

我对GTK一无所知，但这对我来说似乎值得怀疑

        Gtk::TreeModel::Row row = *(liststore->append());
        row[cols.name] = "foo";
        row[cols.value] = 10;
        row[cols.color] = "blue";

尝试使用参考

        Gtk::TreeModel::Row& row = *(liststore->append());
        row[cols.name] = "foo";
        row[cols.value] = 10;
        row[cols.color] = "blue";

对我来说，您似乎正在添加一行，但随后修改了该行的副本，而不是所添加的行。

编辑

仔细阅读了文档，https://developer.gnome.org/gtkmm/stable/classGtk_1_1ListStore.html我认为需要这样的东西

        Gtk::ListStore::iterator row = liststore->append();
        (*row)[cols.name] = "foo";
        (*row)[cols.value] = 10;
        (*row)[cols.color] = "blue";

Answer 2

以下是对我有帮助的解决方案。使用Gtk::manage：

Gtk::TreeView::Column *xxx = Gtk::manage(new Gtk::TreeViewColumn("Name"));
xxx->pack_start(m_Columns.m_col_name, true);
m_TreeView.append_column(*xxx)