Re: Why button press event only reacts on double click?

[Kjell Ahlstedt <kjellahlstedt gmail com>]

On 2017-12-26 12:03, Chris Vine wrote:

On Tue, 26 Dec 2017 10:56:34 +0100
Klaus Rudolph <lts-rudolph gmx de> wrote:

The function "signal_button_press_event()" reacts only if I double
click the button. Is it possible to react also on a single press
event?

#include <iostream>
#include <gtkmm.h>
#include <gtkmm/window.h>

class ExampleWindow: public Gtk::Window
{
     Gtk::Button button;
     public:
     ExampleWindow(): button("Hallo")
     {
         add(button);
         button.signal_button_press_event().connect( [this]( 
GdkEventButton* ev)->bool{ std::cout << "Press" << std::endl; return 
true; });
     }
};


int main(int argc, char* argv[])
{
     Gtk::Main kit(argc, argv);

     ExampleWindow window;

     window.show_all_children();
     Gtk::Main::run(window);
     return 0;
}

button-press-event is a GDK event and is concerned principally with
mouse buttons. You want the clicked signal.

If you do prefer signal_button_press_event(), connect your signal handler so it's called before the default handler.
button.signal_button_press_event().connect(......., false);
See https://developer.gnome.org/gtkmm-tutorial/stable/sec-xeventsignals.html.en

If you connect your signal handler to run before the default signal handler, and your handler returns true, the default handler will not be called.

Kjell