CODEWITHSUNDEEP
signalsgtkmmclick
TrolliOlli
TrolliOlli

Reputation: 915

Anyway to pass parameters to a method called when a Gtkmm button is pressed?

I'm working on a gtkmm program and I would like to have a button that, when pressed, changes a given variable. For intensive purposes lets say I can't make this variable global. Is it still possible to call something like:

m_button2.signal_clicked().connect(sigc::ptr_fun(&on_player_button_clicked));

where on_player_button_clicked is the method that's called when button2 is pressed, but also pass it a parameter. So I want my button, when pressed, to call my method like this:

int parameter
m_button2.signal_clicked().connect(sigc::ptr_fun(&on_player_button_clicked(parameter)));

If this is not possible, is there any way for me to get my button to change this variable without making the variable global?

Upvotes: 1

Views: 932

Answers (1)

cfa45ca55111016ee9269f0a52e771
cfa45ca55111016ee9269f0a52e771

Reputation: 2193

In terms of design, at least OO design, first decide who owns the variable.

Then, the idea is to send that owner a message, "Mr owner, I command you to change the variable". You can do this by emitting a "variable_needs_change" signal and have the owner listen to it, or give the owner a setter method and have the button use it (by giving the callback function access to a referece to the owner).

But putting it aside, there's the simple option of binding. This is the staright-forward solution: use sigc::bind to add an argument. There's an example for this in the gtkmm book, if I'm not mistaken (and probably in the sigc++ tutorial too).

Upvotes: 1

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