Scaling font as window is resized - c++

Question

I'm writing a C++ calculator application in wxWidgets.
I want the font of all the buttons and the two wxTextCtrl's to be scaled as I resize the window. How is that done? I'm posting some code if that can help.
text_controls.cpp
#include "main.h"
void Main::AddTextControls()
{
//creazione font
wxFont Expression(10, wxFONTFAMILY_SWISS, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_LIGHT, false, "Lato");
wxFont Main(30, wxFONTFAMILY_SWISS, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_LIGHT, false, "Lato");
wxBoxSizer* sizer = new wxBoxSizer(wxVERTICAL);
ExpText = new wxTextCtrl(this, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxTE_READONLY | wxNO_BORDER);
ExpText->SetFont(Expression);
ExpText->SetForegroundColour(wxColour(125, 125, 125));
sizer->Add(ExpText, 1, wxEXPAND);
MainText = new wxTextCtrl(this, wxID_ANY, "", wxDefaultPosition, wxDefaultSize, wxTE_READONLY | wxNO_BORDER);
MainText->SetFont(Main);
MainText->SetForegroundColour(wxColour(55, 55, 55));
MainText->Bind(wxEVT_TEXT, &Main::OnTextChange, this);
sizer->Add(MainText, 2, wxEXPAND);
MainSizer->Add(sizer, 4, wxEXPAND);
}

Answer 1

You could use wxFont::SetPixelSize() to set the font size to, say, one third of the text control height. E.g.:
MainText->Bind(wxEVT_SIZE, [this](wxSizeEvent& e) {
e.Skip();
MainText->SetFont(wxFontInfo(wxSize(0, MainText->GetSize().y / 3)).Family(wxFONTFAMILY_SWISS).FaceName("Lato").Light());
});
(which also shows using a more readable way of creating a wxFont than the ctor taking a zillion arguments).