How to show another frame after the event? - c++

Question

how to show another frame after button click event?
like this
My code here show window OnInit. but what to do next?
I did not find how to do this. little experience with this.
I comment the window that should be.
enum
{
wxID_First_Load = 5000,
wxID_First_Frame,
wxID_First_Panel
};
class MyFrame : public wxFrame
{
public:
MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
void fileLoad(wxCommandEvent& event);
private:
int file_count = 0;
wxDECLARE_EVENT_TABLE();
};
wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_BUTTON(wxID_First_Load, MyFrame::fileLoad)
wxEND_EVENT_TABLE()
wxIMPLEMENT_APP(MyApp);
bool MyApp::OnInit()
{
MyFrame *frame = new MyFrame("Hello World", wxDefaultPosition, wxSize(450, 250));
frame->SetWindowStyle(wxCAPTION | wxSYSTEM_MENU );
frame->Show(true);
return true;
}
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
: wxFrame(NULL, wxID_First_Frame, title, pos, size)
{
wxBoxSizer *first_sizer = new wxBoxSizer(wxVERTICAL);
wxPanel *firstPanel = new wxPanel(this, wxID_First_Panel);
wxButton *firstButton_Load = new wxButton(firstPanel, wxID_First_Load, "Choose file");
firstPanel->SetSizer(first_sizer);
first_sizer->Add(firstButton_Load, 1, wxEXPAND | wxALL, 10);
firstPanel->SetSizer(first_sizer);
}
void MyFrame::fileLoad(wxCommandEvent& WXUNUSED(event))
{
file_count = 2;
}
Second Frame or window:
wxPanel *firstPanel = new wxPanel(this, wxID_First_Panel);
wxBoxSizer *second_sizer = new wxBoxSizer(wxVERTICAL);
for (int i = 0; i < file_count; i++)
{
second_sizer->Add(new wxTextCtrl(firstPanel, wxWindowID(i), "Hello", wxDefaultPosition, wxSize(235, 60)), wxSizerFlags(0).Border(wxALL, 5));
}
firstPanel->SetSizer(second_sizer);

Answer 1

To create a new frame you need to create a new object of wxFrame class or a class deriving from it. Typically, you want to put some data and logic into your new frame, so you would create some class, e.g. MySecondaryFrame (but hopefully with a better name) , inheriting from wxFrame in a similar way to your existing MyFrame class.
Then to show it you would do the same thing that you do in MyApp::OnInit(), i.e. create a new object of this class and call Show() to actually show it.
P.S. Note that your SetWindowStyle(wxCAPTION | wxSYSTEM_MENU ) call is unnecessary, these styles are already on by default. Also, hard coding the frame size in pixels is a bad idea, consider using sizers to determine the best size suitable for the frame contents or just leave it unspecified if it really doesn't matter.