Gtkmm：使用保存在std :: vector中的小部件的RefPtr [英] Gtkmm: Using RefPtr with widgets kept in std::vector

问题描述

我想保留一个 std :: vector Gtk :: Widget 并且可能会在 Gtk :: Container 之间移动。

I am trying to keep a std::vector of Gtk::Widgets that I am showing (and will potentially be) moving around between Gtk::Containers.

c $ c> Gtk :: Notebook 这基本上是一个到 std :: vector 的一对一映射，但如果我使用 Glib :: RefPtr 周围的小部件我从笔记本中删除小部件时遇到问题。我已经必须使用一个hack来获取指向底层Gtk对象的指针，当它添加到笔记本，我怀疑当从容器中删除对象时，Notebook容器释放/删除对象。

At the moment I keep a Gtk::Notebook which is basically a one-to-one map to the std::vector, but if I use Glib::RefPtr around the widgets I get problems when removing the widget from the notebook. I already have to use a 'hack' to get a pointer to the underlying Gtk object when adding it to the notebook and I suspect that the Notebook container frees/deletes the object when I remove it from the container.

我已经定义了我的向量的小部件，像这样：
std :: vector< Glib :: RefPtr< Gtk :: Widget>小部件;

I have defined my vector of widgets something like this: std::vector<Glib::RefPtr<Gtk::Widget>> widgets;

当我向向量和笔记本中添加一个小部件时：

When I add a widget to the vector and the notebook I do:

Glib::RefPtr<Gtk::Widget> w (new Gtk::Widget());
widgets.push_back (w);
Gtk::Widget *wptr = w.operator->(); // hack
notebook.append_page (*wptr);

当我尝试删除它：

int c = 1; // widget no. to remove
notebook.remove_page (c);
auto it = widgets.begin() + c;
widgets.erase (it);

但这会导致 G_IS_OBJECT when（I think） std :: vector 中的元素在迭代器的函数），因为可能 notebook.remove_page（）已经释放了对象。我如何做到这一点？是否可能与 RefPtr 的？

but this results in a G_IS_OBJECT fail assertion when (I think) the element in the std::vector is cleaned up at the end of the iterator (end of function), since possibly notebook.remove_page() already freed the object. How can I do this? Is it possible with RefPtr's?

相关（同一断言失败）：破坏Glib :: RefPtr会导致GTK 3内核中的失败断言

Related (same assertion failure): Destructing Glib::RefPtr causes failed assertions in the GTK 3 core

推荐答案

不幸的是，你不能这样做，因为 Gtk :: Notebook 子对象的所有权。你必须重构你的代码，使用 Gtk :: Notebook 本身访问小部件，而不是向量示例，其中包含 Gtk :: Notebook :: get_nth_page（） 。

Unfortunately you can't do this because the Gtk::Notebook takes ownership of the child objects. You have to refactor your code to use the Gtk::Notebook itself to access the widgets instead of the vector, for example with Gtk::Notebook::get_nth_page().

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