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wxwidgets为什么我的窗口无法退出了？
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下一篇 2012-08-13 19:19:09
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我做了一个小程序来学习wxWidgets的最简单的编程结构。我的程序是基于《跨平台开发wxWidgets》中minimal.cpp这个例子的，一个wxApp派生类，一个wxFrame派生类。然后我只是在wxFrame派生了中增加了对PAINT事件的支持。编译可以成功，但是运行的时候无论是quit还是about菜单都无法响应了。直接点右上角的关闭也无法让窗口关闭。窗口仅仅是失去焦点了那样地定在那里，什么也不做。谁能告诉我这是为什么呢？我把有问题的代码如下。
// 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);
void OnPaint(wxPaintEvent& event);
private:
void DrawMsg(void);
void CreateControl(void);
wxBoxSizer *topSizer; //layout parameter
// 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)
EVT_PAINT(MyFrame.:OnPaint)
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
wxMessageBox(wxT("On exit!"), wxT("Quit Minimal"),
wxOK | wxICON_INFORMATION, this);
Close(true);
}
void MyFrame.:OnPaint(wxPaintEvent& evetn){
}
void MyFrame.:CreateControl(){
}
MyFrame.:MyFrame(const wxString& title)
: wxFrame(NULL, wxID_ANY, title)
{
// Set the frame. icon
// 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);
CreateControl();
// Create a status bar just for fun
CreateStatusBar(2);
SetStatusText(wxT("Welcome to wxWidgets!"));
}
OnPaint里面什么都不干就是原因，如果你目前不打算任何特殊处理的话，请调用skip()，或者是单纯获取该窗口的dc也可以，总之要让系统知道你已经响应了重绘的请求
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