I'm writing an application with an OpenGL GUI. On Windows, I'm using GetOpenFilename
to allow the user to select a file.
I tried to implement similar functionality for on Linux for Gtk, using Gtk::FileChooserDialog
(following this tutorial). I'm trying to keep the function signature the same for Windows and Linux, so I modified the example to look like this:
std::string browseFile( std::string filetypes )
{
Gtk::Main kit(false);
Gtk::FileChooserDialog dialog( "Please choose a file",
Gtk::FILE_CHOOSER_ACTION_OPEN );
// dialog.set_transient_for( kit.instance() );
//Add response buttons the the dialog:
dialog.add_button( Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL );
dialog.add_button( Gtk::Stock::OPEN, Gtk::RESPONSE_OK );
//Add filters, so that only certain file types can be selected:
Glib::RefPtr<Gtk::FileFilter> filter_any = Gtk::FileFilter::create();
filter_any->set_name( "Any files" );
filter_any->add_pattern( "*" );
dialog.add_filter( filter_any );
//Show the dialog and wait for a user response:
int result = dialog.run();
//Handle the response:
switch( result )
{
case( Gtk::RESPONSE_OK ):
{
std::cout << "Open clicked." << std::endl;
//Notice that this is a std::string, not a Glib::ustring.
std::string filename = dialog.get_filename( );
std::cout << "File selected: " << filename << std::endl;
return filename;
}
case( Gtk::RESPONSE_CANCEL ): { std::cout << "Cancel clicked." << std::endl; break; }
default: { std::cout << "Unexpected button clicked." << std::endl; break; }
}
return std::string( "" );
}
The main difference is that I eliminated the set_transient_for
bit, since my main window isn't managed by Gtk (it's created by freeglut).
Problem: after I choose a file, the dialog just freezes. My application continues running, I can process the selected file, it's just the dialogs that freeze.
How do I kill the dialog box after choosing a file ? I tried dialog.hide()
, but it doesn't seem to have any effect. I'm also trying to contain Gtk-specific code to this function, keeping int main()
free of platform-specific code.
I decided to create overloaded class for this. The code is below:
class FileChooser : public Gtk::FileChooserDialog {
public:
static std::string getFileName() {
FileChooser dialog("Select file", Gtk::FILE_CHOOSER_ACTION_OPEN);
kit.run(dialog);
std::string ret = dialog.chosenFile;
return ret;
}
protected:
static Gtk::Main kit;
std::string chosenFile;
FileChooser(const Glib::ustring& title, Gtk::FileChooserAction action = Gtk::FILE_CHOOSER_ACTION_OPEN) :
Gtk::FileChooserDialog(title, action) {
chosenFile = std::string("");
add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
add_button(Gtk::Stock::OPEN, Gtk::RESPONSE_OK);
signal_response().connect(sigc::mem_fun(*this,
&FileChooser::on_my_response));
}
void on_my_response(int response_id) {
chosenFile = get_filename();
hide();
}
};
Gtk::Main FileChooser::kit(false);
You can use it like this:
std::cout << "File: " << FileChooser::getFileName() << "\n";