c++ - wxButton 不会触发事件。

Question

这是我的代码。我现在的 ID 不同了，但问题是我按下按钮时似乎无法触发事件。我有点困惑为什么事件不会触发。它曾经在两个 ID 都是 wxID_ANY 时工作，但当我这样做时两个按钮做同样的事情，现在，当我声明一个新 ID 时，它们都不起作用。

标题:

#include <vector>
#include <wx/wx.h>
using namespace std;

const int MAX = 100;
class determinantsFrame : public wxFrame
{
public:
    determinantsFrame();
    virtual ~determinantsFrame();

    void OnQuit(wxCommandEvent &event);
    void OnAbout(wxCommandEvent &event);
    void OnClose(wxCloseEvent &event);
    void OnCalculateClick(wxCommandEvent &event);
    void OnReset(wxCommandEvent &event);
    double determinant(double matrix[MAX][MAX], int order);

private:

    static const long ID_Calculate;
    static const long ID_Reset;

    wxPanel *MainPanel;
    wxButton *Enter;
    wxButton *Reset;
    wxMenu *fileMenu;
    wxMenu *helpMenu;
    wxMenuBar *menuBar;
    wxTextEntryDialog *td;
    wxString str;
    //vector<double> value;

    DECLARE_EVENT_TABLE();
};

CPP:

#include <wx/wx.h>
#include "determinantsFrame.h"
#include <vector>
#include <stdio.h>
#include <cmath>
#include <vector>
using namespace std;

BEGIN_EVENT_TABLE(determinantsFrame, wxFrame)
    EVT_MENU(wxID_ABOUT, determinantsFrame::OnAbout)
    EVT_MENU(wxID_EXIT, determinantsFrame::OnQuit)
    EVT_CLOSE(determinantsFrame::OnClose)
    EVT_BUTTON(ID_Calculate, determinantsFrame::OnCalculateClick)
    EVT_BUTTON(ID_Reset, determinantsFrame::OnReset)
END_EVENT_TABLE()

int n;
wxTextCtrl *numbers[100][100];

const long determinantsFrame::ID_Calculate = wxNewId();
const long determinantsFrame::ID_Reset = wxNewId();

void determinantsFrame::OnClose(wxCloseEvent &event)
{
    exit(1);
}

void determinantsFrame::OnAbout(wxCommandEvent &event)
{
    wxString msg;
    msg.Printf(wxT("Hello and welcome to %s"), wxVERSION_STRING);
    wxMessageBox(msg, wxT("About Determinants Calculator"));
}

void determinantsFrame::OnQuit(wxCommandEvent &event)
{
    Close();
}

determinantsFrame::~determinantsFrame()
{
    Destroy();
}

determinantsFrame::determinantsFrame() : wxFrame(NULL, wxID_ANY, wxT("Determinants Calculator"), wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE)
{
    wxStaticBoxSizer *matrix;
    wxFlexGridSizer *cells;
    wxBoxSizer *subBox;
    wxBoxSizer *mainBox;

    fileMenu = new wxMenu;
    helpMenu = new wxMenu;
    menuBar = new wxMenuBar();

    helpMenu->Append(wxID_ABOUT, wxT("&About"), wxT("Show about dialog"));
    fileMenu->Append(wxID_EXIT, wxT("&Exit"), wxT("Quit this program"));

    menuBar->Append(fileMenu, wxT("&File"));
    menuBar->Append(helpMenu, wxT("&Help"));

    td = new wxTextEntryDialog(this, wxT("Enter the number of dimensions: "), wxGetTextFromUserPromptStr, wxT("2"));
    td->ShowModal();
    SetMenuBar(menuBar);
    str = td->GetValue();
    n = wxAtoi(str);

    mainBox = new wxBoxSizer(wxVERTICAL);
    MainPanel = new wxPanel(this, wxID_ANY);
    matrix = new wxStaticBoxSizer(wxVERTICAL, MainPanel, "Matrix: ");
    cells = new wxFlexGridSizer(0, n, 0, 0);
    subBox = new wxBoxSizer(wxVERTICAL);

    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
        {
            numbers[i][j] = new wxTextCtrl(MainPanel, wxID_ANY, wxEmptyString, wxDefaultPosition, wxSize(40,20), 0, wxDefaultValidator, _T("ID_TextCtrl"));
            cells->Add(numbers[i][j], 0, wxALL | wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
        }

    matrix->Add(cells, 1, wxALL|wxEXPAND|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 2);
    subBox->Add(matrix, 1, wxALL|wxEXPAND|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);

    wxBoxSizer *enb = new wxBoxSizer(wxHORIZONTAL);
    wxBoxSizer *rnb = new wxBoxSizer(wxHORIZONTAL);
    wxBoxSizer *bc = new wxBoxSizer(wxHORIZONTAL);

    Enter = new wxButton(MainPanel, ID_Calculate, _("Calculate"), wxDefaultPosition, wxDefaultSize, 0, wxDefaultValidator, _T("ID_Calculate"));
    Reset = new wxButton(MainPanel, ID_Reset, _("Reset"), wxDefaultPosition, wxDefaultSize, 0, wxDefaultValidator, _T("ID_Reset"));
    enb->Add(Enter, 1, wxALL |wxEXPAND|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    rnb->Add(Reset, 1, wxALL |wxEXPAND|wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL, 5);
    bc->Add(enb, 0, wxALL | wxEXPAND);
    bc->Add(rnb, 0, wxALL | wxEXPAND);
    subBox->Add(bc, 0, wxALIGN_CENTER_HORIZONTAL|wxALIGN_CENTER_VERTICAL);
    MainPanel->SetSizer(subBox);
    mainBox->Add(MainPanel);
    mainBox->Fit(this);
    this->SetSizer(mainBox);
    CentreOnScreen();
}

void determinantsFrame::OnReset(wxCommandEvent &event)
{
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            numbers[i][j]->SetLabel(wxEmptyString);
}

void determinantsFrame::OnCalculateClick(wxCommandEvent &event)
{
    double elem[MAX][MAX], det;
    for (int i = 0; i < n; i++)
        for (int j = 0; j < n; j++)
            elem[i][j] = static_cast<double>(wxAtoi(numbers[i][j]->GetValue()));

    det = determinant(elem, n);
    wxMessageBox(wxString::Format(wxT("%.2f"),det));
}

double determinantsFrame::determinant(double matrix[MAX][MAX], int order)
{
    double det = 0, temp[MAX][MAX]; int row, col;

    if (order == 1)
        return matrix[0][0];
    else if (order == 2)
        return ((matrix[0][0] * matrix[1][1]) - (matrix[0][1] * matrix[1][0]));
    else
    {
        for (int r = 0; r < order; r++)
        {
            col = 0; row = 0;
            for (int i = 1; i < order; i++)
            {
                for (int j = 0; j < order; j++)
                {
                    if (j == r)
                        continue;

                    temp[row][col] = matrix[i][j];
                    col++;

                    if (col == order - 1)
                        col = 0;
                }
                row++;
            }
            det = det + (matrix[0][r] * pow(-1, r) * determinant(temp, order - 1));
        }
        return det;
    }
}

Answer 1

您不能使用 wxNewId() 这是一个运行时函数来初始化编译时事件表宏中使用的 ID。要么使 ID 成为真正的编译时常量，要么使用 Bind() 而不是事件表来在运行时连接处理程序。

顺便说一句，从 OnClose() 调用 exit() 是完全错误的。我强烈建议查看 wxWidgets 示例以了解事情通常是如何完成的。更好的方法是阅读文档以了解他们为什么这样做，但这可能是下一步。