The Whole Program
It's worth putting together the bits so you can see what the whole program looks like. Normally, you'd have a separate header file and implementation file, but for such a simple program, we can put it all in the same file.
Listing 2-1. The Complete Example
// Name: minimal.cpp
// Purpose: Minimal wxWidgets sample
// Author: Julian Smart
#include "wx/wx.h"
// Declare the application class
class MyApp : public wxApp
{
public:
// Called on application startup
virtual bool OnInit();
};
// Declare our main frame class
class MyFrame : public wxFrame
{
public:
// Constructor
MyFrame(const wxString& title);
// Event handlers
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
private:
// This class handles events
DECLARE_EVENT_TABLE()
};
// Implements MyApp& GetApp()
DECLARE_APP(MyApp)
// Give wxWidgets the means to create a MyApp object
IMPLEMENT_APP(MyApp)
// Initialize the application
bool MyApp::OnInit()
{
// Create the main application window
MyFrame *frame = new MyFrame(wxT("Minimal wxWidgets App"));
// Show it
frame->Show(true);
// Start the event loop
return true;
}
// Event table for MyFrame
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(wxID_ABOUT, MyFrame::OnAbout)
EVT_MENU(wxID_EXIT, MyFrame::OnQuit)
END_EVENT_TABLE()
void MyFrame::OnAbout(wxCommandEvent& event)
{
wxString msg;
msg.Printf(wxT("Hello and welcome to %s"),
wxVERSION_STRING);
wxMessageBox(msg, wxT("About Minimal"),
wxOK | wxICON_INFORMATION, this);
}
void MyFrame::OnQuit(wxCommandEvent& event)
{
// Destroy the frame
Close();
}
#include "mondrian.xpm"
MyFrame::MyFrame(const wxString& title)
: wxFrame(NULL, wxID_ANY, title)
{
// Set the frame icon
SetIcon(wxIcon(mondrian_xpm));
// Create a menu bar
wxMenu *fileMenu = new wxMenu;
// The "About" item should be in the help menu
wxMenu *helpMenu = new wxMenu;
helpMenu->Append(wxID_ABOUT, wxT("&About...\tF1"),
wxT("Show about dialog"));
fileMenu->Append(wxID_EXIT, wxT("E&xit\tAlt-X"),
wxT("Quit this program"));
// Now append the freshly created menu to the menu bar...
wxMenuBar *menuBar = new wxMenuBar();
menuBar->Append(fileMenu, wxT("&File"));
menuBar->Append(helpMenu, wxT("&Help"));
// ... and attach this menu bar to the frame
SetMenuBar(menuBar);
// Create a status bar just for fun
CreateStatusBar(2);
SetStatusText(wxT("Welcome to wxWidgets!"));
}
|