如何更改GtkTreeModel的数据(在“已编辑"回调中) [英] How to change data of a GtkTreeModel (within "edited" callback)

问题描述

我正在捕捉我的GtkCellRenderer的已编辑"信号:

I'm catching the "edited" signal of my GtkCellRenderer:

GtkTreeModel * sortmodel; // contains a sorted model of GtkListStore

// ...

GtkCellRenderer * renderer;

// ...

g_object_set(renderer, "editable", TRUE, NULL);    
g_signal_connect(renderer, "edited",
                G_CALLBACK(onEdited_name), sortmodel);

我现在想相应地更改单元格的内容，但是我找不到任何可以更改GtkTreeModel单元格内容的函数.

I'd now like to change the content of the cell accordingly, but I don't find any function, that would change the content of a cell of a GtkTreeModel.

void onEdited_name(GtkCellRendererText *cell,
                        gchar * path_string,
                        gchar * new_text,
                        gpointer treemodel)
{
  GtkTreeModel * model = GTK_TREE_MODEL(treemodel);

  GtkTreeIter iter;
  gtk_tree_model_get_iter_from_string(model, &iter, path_string);  

  // TODO: set the value according to iter.
  // gtk_list_store_set will not work of course, because
  //  we're operating on a GtkTreeModel   
}  

此问题与以下内容有关:更改GTK树的内容查看

This question is related to: Changing the content of a GTK Tree View

推荐答案

您的第一个代码段是正确的.

Your first code snippet is correct.

1. 您无法更改GtkTreeModel上的值.
2. 您只能在原始"模型(基本模型，例如GtkListStore或GtkTreeStore)上更改值.

1. You cannot change a value on a GtkTreeModel.
2. You can only change a value on the "raw" model (the base model like GtkListStore or GtkTreeStore).

理论-熟悉

GTK层次结构

下图显示了GtkTreeModel层次结构及其提供的(重要)功能

Theory - Good to know

Gtk hierarchy

The following picture shows the GtkTreeModel hierarchy and what (important) functions they offer

如您所见，如果要更改单元格的值，则需要区分实际使用的模型.

As you can see, if you want to change the values of cells, you need to differentiate what kind of model you're actually working on.

仅应将一个渲染器分配"到一列.否则，您将不知道用户试图更改哪一列.

One Renderer should only be "assigned" to one column. Otherwise you don't know which column the user tried to change.

请参见下面的GtkListStore示例，并将GtkListStore替换为GtkTreeStore.希望可以达到目的.

See the example below for GtkListStore, and replace GtkListStore with GtkTreeStore. That should hopefully do the trick.

void 
onEdited_name (GtkCellRendererText * cell,
               gchar               * path_string,
               gchar               * new_text,
               gpointer              p_model_sorted)
{       
    // we need to convert to GtkListStore, because GtkTreeModel does not
    //  provide an interface for cell content changing.


    // convert raw data to the actual type
    GtkTreeModelSort * model_sorted = GTK_TREE_MODEL_SORT(p_model_sorted);

    // get the iterator within the sorted model
    GtkTreeIter iter_sortedModel;
    gtk_tree_model_get_iter_from_string((GtkTreeModel*)model_sorted,
                  &iter_sortedModel, path_string);          

    // convert sorted model to raw model
    GtkListStore * model_raw;       
    model_raw = GTK_LIST_STORE(gtk_tree_model_sort_get_model(model_sorted));

    // convert the iterator to one of the raw model.
    // (Otherwise the wrong cell will change)
    GtkTreeIter iter_rawModel;
    gtk_tree_model_sort_convert_iter_to_child_iter(model_sorted, &iter_rawModel, &iter_sortedModel);


    gtk_list_store_set(model_raw, &iter_rawModel,
                                LIST_COL_NAME, new_text, -1);
} 

更改 GtkListStore

的GtkListStore或GtkTreeModelSort的值

假设您有两个基于相同模型显示的GtkTreeView.一个排序，另一个不排序.此功能将向您展示如何管理它们.

Change value of a GtkListStore OR GtkTreeModelSort of GtkListStore

Imagine you have two GtkTreeViews shown based on the same model. One is sorted, the other one not. This function will show you how to manage those.

请注意，我们现在将 GtkTreeView 作为gpointer而不是GtkTreeModel.

Note, that we now pass a GtkTreeView as gpointer, instead of GtkTreeModel.

void onEdited_name(GtkCellRendererText *cell,
                        gchar * path_string,
                        gchar * new_text,
                        gpointer _treeview) // <--- GtkTreeView now!!!!
{
    // we HAVE TO use GtkTreeView within gpointer!
    //  otherwise we could not differntiate the model type!
    GtkTreeView * treeview = GTK_TREE_VIEW(_treeview);
    GtkTreeModel * treeModel = gtk_tree_view_get_model(treeview);

    // we need to use GtkListStore, because GtkTreeModel does not
    //  provide an interface for cell changing.
    GtkListStore * model;   
    GtkTreeIter iter_rawModel;

    // check if we're working on the raw model or on a sorted version
    //  of it
    if(GTK_IS_LIST_STORE(treeModel)){
        // just use the model as is    
        model = GTK_LIST_STORE(treeModel);

        // retrieve the iterator for the cell, that should be changed
        gtk_tree_model_get_iter_from_string((GtkTreeModel*)model,
                                            &iter_rawModel, path_string);

    } else { // we're working on a sorted model   
        // We need to change to a usual model.
        GtkTreeModelSort * sortedModel = GTK_TREE_MODEL_SORT(treeModel);
        model = GTK_LIST_STORE(gtk_tree_model_sort_get_model(sortedModel));

        // get the iterator within the sorted model
        GtkTreeIter iter_sortedModel;
        gtk_tree_model_get_iter_from_string((GtkTreeModel*)sortedModel,
                              &iter_sortedModel, path_string);  

        // convert the iterator to one of the raw model.
        // (Otherwise the wrong cell will change)
        gtk_tree_model_sort_convert_iter_to_child_iter(sortedModel, &iter_rawModel, &iter_sortedModel);
    }


    gtk_list_store_set(GTK_LIST_STORE(model), &iter_rawModel,
                LIST_COL_NAME, new_text, -1);

}   

这是排序模型的功能齐全的示例代码

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