《使用wxWidgets进行跨平台程序开发》chap02——一个简单的应用程序

// Name:        minimal.cpp
// Purpose:     Minimal wxWidgets sample
// Author:      Julian Smart

#include "wx/wx.h"

// Declare the application class
//定义应用程序类
class MyApp : public wxApp
{
public:
// Called on application startup
//这个函数将会在程序启动的时候被调用
virtual bool OnInit();
};

// Declare our main frame class
//定义主窗口类
class MyFrame : public wxFrame
{
public:
// Constructor
//主窗口类的构造函数
MyFrame(const wxString& title);

// Event handlers
//事件处理函数
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);

private:
// This class handles events
//声明事件表
DECLARE_EVENT_TABLE()
};

// Implements MyApp& GetApp()
//有了这一行就可以使用MyApp & wxGetApp()了
DECLARE_APP(MyApp)

// Give wxWidgets the means to create a MyApp object
//告诉主应用程序是哪个类的wxWidgets
IMPLEMENT_APP(MyApp)

// Initialize the application
//初始化程序
bool MyApp::OnInit()
{
// Create the main application window
//创建主窗口
MyFrame *frame = new MyFrame(wxT("Minimal wxWidgets App"));

// Show it
// 显示主窗口
frame->Show(true);

// Start the event loop
//开始事件处理循环
return true;
}

// Event table for MyFrame
//类的事件表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
//释放主窗口
Close();
}

#include "mondrian.xpm"

MyFrame::MyFrame(const wxString& title)
: wxFrame(NULL, wxID_ANY, title)
{
// Set the frame icon
//设置窗口图标
SetIcon(wxIcon(mondrian_xpm));

// Create a menu bar
//创建菜单条
wxMenu *fileMenu = new wxMenu;
wxMenu *helpMenu = new wxMenu;

// The "About" item should be in the help menu
//添加“关于菜单项”
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...
//将菜单项添加到菜单条中
wxMenuBar *menuBar = new wxMenuBar();
menuBar->Append(fileMenu, wxT("&File"));
menuBar->Append(helpMenu, wxT("&Help"));

// ... and attach this menu bar to the frame
//然后将菜单条放置在主窗口上
SetMenuBar(menuBar);

// Create a status bar just for fun
//创建一个状态条让一切更有趣些
CreateStatusBar(2);
SetStatusText(wxT("Welcome to wxWidgets!"));
}