c++ - 事件处理程序未被调用？ - wxWidgets

Question

我正在为我的 C++ 编程类(class)开发一个程序，使用的是 wxWidgets。我有一个很大的问题，我的事件处理程序(我假设)没有被调用，因为当我点击按钮触发事件时，没有任何反应。我的问题是:你能帮我找到问题并解释为什么他们没有接到电话吗？

事件处理程序 OnAbout 和 OnQuit 正在工作，只是 OnCompute 或 OnClear 不工作。我真的很沮丧，因为我无法弄清楚这一点。提前致谢!

#include "wx/wx.h"
#include "time.h"
#include <string>
using std::string;

// create object of Time class
Time first;

class App: public wxApp
{
virtual bool OnInit();
};

class MainPanel : public wxPanel
{
 public:
   // Constructor for panel class
   // Constructs my panel class 
   // Params - wxWindow pointer
   // no return type
   // pre-conditions: none
   // post-conditions: none
   MainPanel(wxWindow* parent);
   // OnCompute is the event handler for the Compute button
   // params - none
   // preconditions - none
   // postconditions - tasks will have been carried otu successfully
   // returns void
   void OnCompute(wxCommandEvent& WXUNUSED(event));
   // OnClear is the event handler for the Clear button
   // params - none
   // preconditions - none
   // postconditions - all text areas will be cleared of data
   // returns void
   void OnClear(wxCommandEvent& WXUNUSED(event));
   // Destructor for panel class
   // params none
   // preconditions - none
   // postconditions - none
   // no return type
   ~MainPanel( );
  private:
wxStaticText *startLabel;
wxStaticText *endLabel;
wxStaticText *pCLabel;
wxStaticText *newEndLabel;
wxTextCtrl *start;
wxTextCtrl *end;
wxTextCtrl *pC;
wxTextCtrl *newEnd;
wxButton *compute;
wxButton *clear;

     DECLARE_EVENT_TABLE()
    };


class MainFrame: public wxFrame
{
private:
wxPanel *mainPanel;
public:
MainFrame(const wxString& title, const wxPoint& pos, const wxSize& size);

void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);

~MainFrame();

  DECLARE_EVENT_TABLE()
  };

enum
{
ID_Quit = 1,
ID_About,
BUTTON_COMPUTE = 100,
BUTTON_CLEAR = 200
};

IMPLEMENT_APP(App)

BEGIN_EVENT_TABLE(MainFrame, wxFrame)
    EVT_MENU(ID_Quit, MainFrame::OnQuit)
    EVT_MENU(ID_About, MainFrame::OnAbout)
END_EVENT_TABLE()

BEGIN_EVENT_TABLE(MainPanel, wxPanel)
EVT_MENU(BUTTON_COMPUTE, MainPanel::OnCompute)
EVT_MENU(BUTTON_CLEAR, MainPanel::OnClear)
END_EVENT_TABLE()

bool App::OnInit()
{
MainFrame *frame = new MainFrame( _("Good Guys Delivery Time Calculator"), wxPoint(50,       50),
                              wxSize(450,340) );
frame->Show(true);
SetTopWindow(frame);
return true;
} 

MainPanel::MainPanel(wxWindow* parent) : wxPanel(parent) 
{
startLabel = new wxStaticText(this, -1, "Start Time:", wxPoint(75, 35));
start = new wxTextCtrl(this, -1, "", wxPoint(135, 35), wxSize(40, 21));

endLabel = new wxStaticText(this, -1, "End Time:", wxPoint(200, 35));
end = new wxTextCtrl(this, -1, "", wxPoint(260, 35), wxSize(40, 21));

pCLabel = new wxStaticText(this, -1, "Percent Change:", wxPoint(170, 85));
pC = new wxTextCtrl(this, -1, "", wxPoint(260, 85), wxSize(40, 21));

newEndLabel = new wxStaticText(this, -1, "New End Time:", wxPoint(180, 130));
newEnd = new wxTextCtrl(this, -1, "", wxPoint(260, 130), wxSize(40, 21));

compute = new wxButton(this, BUTTON_COMPUTE, "Compute", wxPoint(135, 185),  wxSize(75, 35));
clear = new wxButton(this, BUTTON_CLEAR, "Clear", wxPoint(230, 185), wxSize(75, 35));
}

MainPanel::~MainPanel() {}

MainFrame::MainFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
: wxFrame( NULL, -1, title, pos, size )
{
mainPanel = new MainPanel(this);
wxMenu *menuFile = new wxMenu;

menuFile->Append( ID_About, _("&About...") );
menuFile->AppendSeparator();
menuFile->Append( ID_Quit, _("E&xit") );

wxMenuBar *menuBar = new wxMenuBar;
menuBar->Append( menuFile, _("&File") );

SetMenuBar( menuBar );

CreateStatusBar();
SetStatusText( _("Hi") );
}

MainFrame::~MainFrame() {}

void MainFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
Close(TRUE);
}

void MainFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{
wxMessageBox( _("Alex Olson\nProject 11"),
              _("About"),
              wxOK | wxICON_INFORMATION, this);
}

void MainPanel::OnCompute(wxCommandEvent& WXUNUSED(event))
{
int startT;
int endT;
int newEndT;
double tD;

wxString startTString = start->GetValue();
wxString endTString = end->GetValue();

startT = wxAtoi(startTString);
endT = wxAtoi(endTString);

pC->GetValue().ToDouble(&tD);

first.SetStartTime(startT);
first.SetEndTime(endT);
first.SetTimeDiff(tD);

try {
    first.ValidateData();
    newEndT = first.ComputeEndTime();
    *newEnd << newEndT;
}
catch (BaseException& e) {
    wxMessageBox(_(e.GetMessage()), 
                 _("Something Went Wrong!"),
                 wxOK | wxICON_INFORMATION, this);
}
}

void MainPanel::OnClear(wxCommandEvent& WXUNUSED(event))
{
start->Clear();
end->Clear();
pC->Clear();
newEnd->Clear();
}

Answer 1

EVT_MENU(BUTTON_COMPUTE, MainPanel::OnCompute) EVT_MENU(BUTTON_CLEAR, MainPanel::OnClear)

在上面的语句中使用 EVT_BUTTON 而不是 EVT_MENU。