从WXTEXTCTRL中获得数值

Question

我正在学习wxwidgets，而不是wxpython，实际的C 库。我遇到了与wxTextCtrl绑定双变量的麻烦。据我所知，应该通过wxValidator模板完成。

在这里，我想将其保留在数组中并编辑5个不同的双打。要从值转换为值，我使用wxComboBox。主要问题该代码在调用 TransferDataFromWindow()时不会更新double tracable，并且在调用 TransferDataToWindow() functions时不会从该变量读取值。

#include "wx/wxprec.h"
#ifdef __BORLANDC__
    #pragma hdrstop
#endif
#ifndef  WX_PRECOMP
  #include "wx/wx.h"
#endif //precompiled headers
#include "wx/log.h"
#include "wx/config.h"
#include "wx/splitter.h"
#include "wx/sizer.h"
#include <wx/spinctrl.h>
#include <wx/grid.h>
//#ifndef wxHAS_IMAGES_IN_RESOURCES
    //#include "../sample.xpm"
//#endif
class FMApp: public wxApp
{
public:
  virtual bool OnInit();
  virtual int OnExit();
};
IMPLEMENT_APP(FMApp)

class FMWnd: public wxFrame
{
public:
    FMWnd();
    virtual ~FMWnd();
    // callbacks
    void OnQuit(wxCommandEvent& event);
    void OnAbout(wxCommandEvent& event);
    void OnSelectDB(wxCommandEvent& event);
private:
    uint        nTrackers;
    double      tracable;
    double      *allTrac;
    int         curTrackers;
    //=== LIFE ===//
    wxTextCtrl *lInTrac;
    wxComboBox *lTrac;
    /*inner functions*/
    void onTrackerChange( wxCommandEvent &);
    wxDECLARE_EVENT_TABLE();
};
enum{
    ID_TRACK= wxID_HIGHEST,
    ID_UNIT,
    //------- EVENTS -------//
    SELECT_TRANS,
    ID_ADD_TRACKABLE,
    FM_LAST
};
bool FMApp::OnInit()
{
    if ( !wxApp::OnInit() ) return false;
    SetVendorName(wxT("TEST"));
    SetAppName(wxT("---"));
    FMWnd *frame = new FMWnd;
    frame->Show(true);
    return true;
}
int FMApp::OnExit()
{
    return 0;
}


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "wx/datetime.h"
#include "wx/colour.h"
#include "wx/notebook.h"
#include "wx/valgen.h"
#include "wx/valnum.h"

wxBEGIN_EVENT_TABLE(FMWnd, wxFrame)
  EVT_MENU(wxID_EXIT, FMWnd::OnQuit)
  EVT_MENU(wxID_ABOUT, FMWnd::OnAbout)
  EVT_COMBOBOX(ID_TRACK, FMWnd::onTrackerChange)
wxEND_EVENT_TABLE()

FMWnd::FMWnd()
    : wxFrame((wxFrame *) NULL, wxID_ANY, wxT("- TEST -"),
        wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE|wxWS_EX_VALIDATE_RECURSIVELY
        )
{
    // menu
    wxMenu *file_menu = new wxMenu;
    file_menu->AppendSeparator();
    file_menu->Append(wxID_EXIT, wxT("E&xittAlt-X"), wxT("Exit the program"));
    wxMenuBar *menu_bar = new wxMenuBar;
    menu_bar->Append(file_menu, wxT("&File"));
    SetMenuBar(menu_bar);
    // child controls
    wxPanel* p = new wxPanel(this, wxID_ANY);
    wxBoxSizer *lAmExDlg = new wxBoxSizer( wxHORIZONTAL );
    lAmExDlg->Add(lTrac = new wxComboBox(p,ID_TRACK),0, wxALIGN_CENTER_VERTICAL|wxALIGN_CENTER_HORIZONTAL| wxFIXED_MINSIZE, 3);
    lTrac->Append(wxT("---"));
    lTrac->Append(wxT("-1-"));
    lTrac->Append(wxT("-2-"));
    lTrac->Append(wxT("-3-"));
    lTrac->Append(wxT("-4-"));
    lTrac->Append(wxT("-5-"));
    lTrac->SetSelection(0l);
    lTrac->SetEditable(false);
    lAmExDlg->Add(lInTrac = new wxTextCtrl(p,wxID_ANY, wxT(""),wxDefaultPosition,wxDefaultSize,wxTE_LEFT, 
            wxMakeFloatingPointValidator(3,&tracable,wxNUM_VAL_THOUSANDS_SEPARATOR |wxNUM_VAL_NO_TRAILING_ZEROES)),
            4, wxALIGN_CENTER_VERTICAL|wxALIGN_CENTER_HORIZONTAL, 3);
    wxBoxSizer *lTopSizer = new wxBoxSizer( wxVERTICAL );
    lTopSizer->Add(lAmExDlg, 1, wxEXPAND );
    p->SetSizer(lTopSizer);
    wxBoxSizer* topSizer = new wxBoxSizer(wxHORIZONTAL);
    topSizer->SetMinSize(250, 100);
    topSizer->Add(p, 1, wxEXPAND);
    SetSizerAndFit(topSizer);
    curTrackers = -1;
    tracable = 20.0;
    nTrackers = 5;
    allTrac = new double[nTrackers];
    for(int cnt=0; cnt<nTrackers; ++cnt)allTrac[cnt] = 0.0;
    if (TransferDataToWindow())fprintf(stderr,"Cannot Transefer Data to Windowsn");
//  lInTrac->TransferDataToWindow();
}
void FMWnd::OnQuit(wxCommandEvent&)
{
    Close(true);
}
void FMWnd::OnAbout(wxCommandEvent&)
{
    wxMessageBox(wxT("wxConfig demon(c) 1998-2001 Vadim Zeitlin"), wxT("About"),
                 wxICON_INFORMATION | wxOK);
}
FMWnd::~FMWnd()
{
    delete[] allTrac;
}
void FMWnd::onTrackerChange(wxCommandEvent& event){
    TransferDataFromWindow();
    lInTrac->TransferDataFromWindow();
    if(curTrackers >= 0){
        allTrac[curTrackers]=tracable;
        printf("Tr:%d Var:%g Val:%gn",curTrackers,allTrac[curTrackers],tracable);
    }
    if (event.GetSelection() == 0){
        tracable = 0.;
        curTrackers = -1;
        lInTrac->SetValue("0.0");
        printf("Reset Trackern");
    } else {
        curTrackers = event.GetSelection() - 1;
        tracable = allTrac[curTrackers];
        TransferDataToWindow();
        lInTrac->TransferDataToWindow();
        printf("Set Tracker to %dn",curTrackers);
    }
}

Answer 1

使用窗口儿童的验证器调用TransferDataFromWindow()，而不是窗口本身。您可以直接调用lInTrac->GetValidator()->TransferFromWindow()以使您的当前代码正常工作，但实际上，将显式处理程序和验证器一起使用的整个想法是可疑的：如果您使用一个或另一个，您的代码将更加清楚但并非这两个机制在一起。

即。您需要使用（可能是自定义的）验证器作为Combobox，或者也许覆盖FMWnd::Transfer{To,From}Window()来处理此组合，并完全删除onTrackerChange()，或或您应该只能获得值直接使用其显式处理程序中的GetValue()方法从文本控件中。

如果您想立即更新，后者是这样做的唯一方法，因为使用验证器实际上仅与某种"应用"/"提交"按钮兼容。