How to link a function to a Button (GUI)?

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Hi,

I'm making a GUI for my EA. 

I'm using this code https://docs.mql4.com/constants/objectconstants/enum_object/obj_button

What I want to do is link a function to a button, so that when I press it, the function gets called. My ugly workaround as of now is: 

void OnTick()
{
        if (ObjectGetInteger(0, "Button", OBJPROP_STATE) && released) {
                Print("I have been pressed");
                released = false;
                pressed = true;
                Sleep(200);
        }
        else if (!ObjectGetInteger(0, "Button", OBJPROP_STATE) && pressed) {
                Print("I have been released");
                released = true;
                pressed = false;
                Sleep(200);
        }
}

 

 Is there a more elegant way to do it? Can I separate the GUI interaction from the OnTick() function? (For example, in the Unity 3D engine, there is the Update() function and the OnGUI() function).

Thank you. 

[Deleted]  

OnTimer()

OnChartEvent() 

[Deleted]  

And do not forget unpress button

 if(ObjectGetInteger(0,"BUY_button",OBJPROP_STATE))
{ 
ObjectSetInteger(0,"BUY_button",OBJPROP_STATE,false);
 

Thanks for answering, eevviill, got it working!

What seems to be not working now is the button unpressing. Shouldn't I be setting the state to true? Anyways, its not working with either.

Ideally, what I would like is that everytime I press the button, the message got printed (and the button to look always ready to be pressed). Right now, it is working like a switch instead of like a button.

Current code: 

void OnChartEvent(const int id, const long& lparam, const double& dparam, const string& sparam)
{
    if (id == CHARTEVENT_OBJECT_CLICK) // Assume there is only this button
        if (ObjectGetInteger(0, "Button", OBJPROP_STATE)) {
            Print("I have been pressed");
            Sleep(100);
            ObjectSetInteger(0, "BUY_button", OBJPROP_STATE, false); // Whether true or false, not working
        }
}
[Deleted]  
Flood19:

Thanks for answering, eevviill, got it working!

What seems to be not working now is the button unpressing. Shouldn't I be setting the state to true? Anyways, its not working with either.

Ideally, what I would like is that everytime I press the button, the message got printed (and the button to look always ready to be pressed). Right now, it is working like a switch instead of like a button.

Current code: 

You make unpress to another name of button

BUY_button 

[Deleted]  

And OnChartEvent and OnTimer 

do not works in tester. Just for information. 

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