从gtk树视图的选定行获取数据 - gtkmm，c ++ [英] Get data from selected row of gtk treeview - gtkmm, c++

问题描述

我有一个GTK应用程序，它有一个窗口 treeview 和一个按钮。当点击按钮时，我需要从 treeview 中选定行的第一个（而且只有）列获取数据。

这是类的类：

  class ModelColumns：
 public Gtk :: TreeModel： ：ColumnRecord {
 public：
 
 ModelColumns（）{add（m_port_name）; } 
 
 Gtk :: TreeModelColumn< Glib :: ustring> m_port_name; 
} 
  

这就像这里的例子，但只有一列： http://www.lugod.org/presentations/gtkmm/treeview.html

这是当前的按钮点击信号处理程序：

tvPorts code> treeview 小部件

tvPortsList 是 listStore for treeview

  static 
 void on_btnPortSelectOK_clicked（）{
 Glib :: RefPtr< Gtk :: TreeSelection> selection = tvPorts-> get_selection（）; 
 Gtk :: TreeModel :: iterator selectedRow = selection-> get_selected（）; 
 //现在什么？ 
 //需要从所选行获取数据才能显示它。 
} 
  

我搜索了文档和许多示例，尝试找出应该做什么下一步，但找不到任何gtkmm的例子，我只能找到c或python实现的例子。

据我所知，我需要得到一个 TreeRow 对象从我的迭代器（ selectedRow ）

---

更新：

我现在正在使用这个代码，它几乎可以工作。
唯一的问题是它打印上一个选择。
第一次选择某项，然后按按钮，它只打印一行。第二次打印第一次选择的内容，第三次打印第二次打印等。

  Glib :: RefPtr  Gtk :: TreeModel :: iterator selectedRow = selection-> get_selected（）; 
 Gtk :: TreeModel :: Row row = * selectedRow; 
 Glib :: ustring port = row.get_value（m_Columns.m_port_name）; 
 printf（\\\
selected port：％s，port.data（））; 
  

这似乎很奇怪。
（ m_Columns 是 ModelColumns 类的一个实例）

---

更新2：

通过添加<$ c $

解决方案

文档说要简单地取消引用iter以获取TreeRow：

  Gtk :: TreeModel :: Row row = * iter; //'iter'as your'selectedRow'
 std :: cout<< row [0]; 
  

I have a GTK application that has a window with a treeview and a button. When the button is clicked I need to get the data from the first (and only) column of the selected row in the treeview.

This is the class for the columns:

class ModelColumns: 
public Gtk::TreeModel::ColumnRecord{
    public:

    ModelColumns(){ add(m_port_name); }

    Gtk::TreeModelColumn<Glib::ustring> m_port_name;
};

This is like in the example here but with only one column: http://www.lugod.org/presentations/gtkmm/treeview.html

This is the button click signal handler at the moment:

tvPorts is the treeview widget

tvPortsList is the listStore for the treeview

static
void on_btnPortSelectOK_clicked (){
    Glib::RefPtr<Gtk::TreeSelection> selection = tvPorts->get_selection();
    Gtk::TreeModel::iterator selectedRow = selection->get_selected();
    //Now what?
    //Need to get data from selected row to display it.
}

I have searched the documentation and many examples to try and find out what to do next but can't find any examples for gtkmm, I can only find examples for c or python implementations.

As far as I can tell, I need to get a TreeRow object from my iterator (selectedRow) how do I do this?

Thanks.

---

Update:

I am now using this code and it almost works. The only problem is that it prints the previous selection. The first time I select something and then press the button it prints only a new line. The second time it prints what was selected the first time, the third prints the second, etc.

Glib::RefPtr<Gtk::TreeSelection> selection = tvPorts->get_selection();
Gtk::TreeModel::iterator selectedRow = selection->get_selected();
Gtk::TreeModel::Row row = *selectedRow;
Glib::ustring port = row.get_value(m_Columns.m_port_name);
printf("\nselected port: %s", port.data());

This seems odd. (m_Columns is an instance of the ModelColumns class)

---

Update 2:

Fixed the problem by adding fflush(stdout); It all works now, thanks.

解决方案

The docs say to simply dereference the iter to get the TreeRow:

Gtk::TreeModel::Row row = *iter;   // 'iter' being your 'selectedRow'
std::cout<<row[0]; 

这篇关于从gtk树视图的选定行获取数据 - gtkmm，c ++的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！