A grand "Thank you" to Daniel Boles and Phil Wolff for their help. I
had been mixing up gtk and gtkmm documentation! I am attaching the
complete now working code for anyone interested.
On 8/10/19 10:04 AM, Phil Wolff via gtkmm-list wrote:
As indicated by the error message, liststore1 is a RefPtr to a
ListStore model, which is a C++ entity that
1) cannot be used as an argument to a gtk+ function, and
2) cannot be dereferenced with the * operator.
At a more fundamental level, this approach is unnecessarily
complicated. The entire contents of the function can be replace with a
single statement:
liststore1->clear ();
On 8/10/19 8:20 AM, pcr wrote:
I have changed from a tree store to a list store now, and I have
working code, except for the last line in this call back used when a
radio button is clicked in order to erase the list store and replace
it with another at run time:
void ExampleWindow::on_rb2_clicked()
{
std::cout << "rb2 clicked" << std::endl;
typedef Gtk::TreeModel::Children type_children;
type_children children = liststore1->children();
type_children::iterator iter;
for(iter=children.begin(); iter!=children.end(); ++iter)
gtk_list_store_remove (*liststore1,*iter);
}
The compiler message I get is
test3.cc: In member function ‘void ExampleWindow::on_rb2_clicked()’:
test3.cc:104:27: error: no match for ‘operator*’ (operand type is
‘Glib::RefPtr<Gtk::ListStore>’)
gtk_list_store_remove (*liststore1,*iter);
So my question is, I suppose, what is the proper syntax for using
gtk_list_store_remove ???
On 8/8/19 3:46 PM, pcr wrote:
I'm trying to learn how to iterate over model rows in a manner
similar to the code segment in section 9.3 of the gnome gtkmm
tutorial. Consider me a newbie; the "something" I want to do below
is delete/clear/erase a row - really all rows so I can display a new
set of rows in response to a user action like changing a radio
button. But I haven't been able to do it. Here is the snippit from
section 9.3:
typedef Gtk::TreeModel::Children type_children; //minimise code length.
type_children children = refModel->children();
for(type_children::iterator iter = children.begin();
iter != children.end(); ++iter)
{
Gtk::TreeModel::Row row = *iter;
//Do something with the row - see above for set/get.
}
*I'm also confused by the following comment I found on line; I don't
see how this can work with the above code either. ***
iterator Gtk::TreeStore:erase(const iterator& iter)
Returns an iterator to the next row or end() if there is none"
I hope you can help me . Thanks, PCR
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//compile me with: g++ -g -Wall -o test3 test3.cc `(pkg-config --cflags --libs gtkmm-3.0)`
#include <gtkmm.h>
#include <iostream>
#include <gtkmm/application.h>
class ExampleWindow : public Gtk::Window
{
public:
ExampleWindow();
virtual ~ExampleWindow();
protected:
//Signal handlers:
void on_rb1_clicked();
void on_rb2_clicked();
void on_treeview_row_activated(const Gtk::TreeModel::Path& path,
Gtk::TreeViewColumn* column);
//Tree model columns:
class ModelColumns : public Gtk::TreeModel::ColumnRecord
{
public:
ModelColumns(){ add(columnid); add(columnname);}
Gtk::TreeModelColumn<unsigned int> columnid;
Gtk::TreeModelColumn<Glib::ustring> columnname;
};
ModelColumns modelcolumns; //the ModelColumns object
//Child widgets:
Gtk::Box vbox1;
Gtk::Box hbox1;
Gtk::RadioButton rb1, rb2;
Gtk::ScrolledWindow scroll1;
Gtk::TreeView treeview1;
Glib::RefPtr<Gtk::ListStore> liststore1;
};
ExampleWindow::ExampleWindow():vbox1(Gtk::ORIENTATION_VERTICAL),hbox1(Gtk::ORIENTATION_HORIZONTAL),rb1("with Model1"),rb2("Model2")
{
set_title("Gtk::TreeView (ListStore) with callbacks");
set_border_width(5);
set_default_size(400, 400);
rb2.join_group(rb1);
add(vbox1);
vbox1.add(hbox1);
hbox1.pack_start(rb1);
hbox1.pack_end(rb2);
//Add the TreeView, inside a ScrolledWindow
scroll1.add(treeview1);
scroll1.set_min_content_height(400);
//Only show the scrollbars when they are necessary:
scroll1.set_policy(Gtk::POLICY_AUTOMATIC, Gtk::POLICY_AUTOMATIC);
vbox1.add(scroll1);
//Create the Tree model:
liststore1 = Gtk::ListStore::create(modelcolumns);
treeview1.set_model(liststore1);
//Add the TreeView's view columns:
treeview1.append_column("ID", modelcolumns.columnid);
treeview1.append_column("Name", modelcolumns.columnname);
//Conection from signals to callbacks
rb1.signal_clicked().connect(sigc::mem_fun(*this,&ExampleWindow::on_rb1_clicked));
rb2.signal_clicked().connect(sigc::mem_fun(*this,&ExampleWindow::on_rb2_clicked));
treeview1.signal_row_activated().connect( sigc::mem_fun(*this,
&ExampleWindow::on_treeview_row_activated));
show_all_children();
}
void ExampleWindow::on_rb1_clicked()
{
int count=5;
std::string names[count] = {"alpha", "beta", "gamma", "delta", "epsilon"};
liststore1->clear();
for(int j=0;j<count;j++)
{
Gtk::TreeModel::Row row = *(liststore1->append());
row[modelcolumns.columnid] = j;
row[modelcolumns.columnname] = names[j];
}
}
void ExampleWindow::on_rb2_clicked()
{
std::string newnames[]= {"Alpha", "Beta", "Gamma", "Delta", "Epsilon"};
liststore1->clear();
int count=5;
for(int j=0;j<count;j++)
{
Gtk::TreeModel::Row row = *(liststore1->append());
row[modelcolumns.columnid] = j;
row[modelcolumns.columnname] = newnames[j];
}
}
void ExampleWindow::on_treeview_row_activated(const Gtk::TreeModel::Path& path,
Gtk::TreeViewColumn*)
{
std::cout << "row_activated has been called" << std::endl;
}
ExampleWindow::~ExampleWindow()
{
}
int main(int argc, char *argv[])
{
auto app = Gtk::Application::create(argc,argv, "org.pcrt.example");
ExampleWindow window;
return app->run(window);
}
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