CheckBox.cpp

#include <wx/app.h>
#include <wx/checkbox.h>
#include <wx/frame.h>
#include <wx/panel.h>

namespace ChackBoxExample {
  class Frame : public wxFrame {
  public:
    Frame() : wxFrame {nullptr, wxID_ANY, "CheckBox example"} {
      checkBox1->Bind(wxEVT_CHECKBOX, [&](wxCommandEvent& event) {
        checkBox1->SetValue(false);
      });

      checkBox2->SetValue(true);
      checkBox2->Bind(wxEVT_CHECKBOX, [&](wxCommandEvent& event) {
        checkBox2->SetLabel(ToString(checkBox2->Get3StateValue()));
      });

      checkBox3->Set3StateValue(wxCHK_UNDETERMINED);
      checkBox3->Bind(wxEVT_CHECKBOX, [&](wxCommandEvent& event) {
        checkBox3->SetLabel(ToString(checkBox3->Get3StateValue()));
      });
    }
    
  private:
    static wxString ToString(wxCheckBoxState state) {
      if (state == wxCHK_UNCHECKED) return "Unchecked";
      if (state == wxCHK_CHECKED) return "Checked";
      return "Indeterminate";
    }
    
    wxPanel* panel = new wxPanel {this};
    wxCheckBox* checkBox1 = new wxCheckBox {panel, wxID_ANY, "Unchecked", {30, 30}};
    wxCheckBox* checkBox2 = new wxCheckBox {panel, wxID_ANY, "Checked", {30, 60}, {200, wxDefaultCoord}};
    wxCheckBox* checkBox3 = new wxCheckBox {panel, wxID_ANY, "Indeterminate", {30, 90}, wxDefaultSize, wxCHK_3STATE | wxCHK_ALLOW_3RD_STATE_FOR_USER};
  };

  class Application : public wxApp {
    auto OnInit() -> bool override {return (new Frame)->Show();}
  };
}

wxIMPLEMENT_APP(ChackBoxExample::Application);