我有一个包含多行的sizer(row_wrap_sizer(。
每一行本身就是一个sizer，在每一行中都包含相同的控件(复选框和组合框(。使每一行不同的是，检查或输入到控件中的值可能不同。
单击按钮后，我需要能够遍历row_wrap_sizer包含的每个子sizer，并查看在控件中输入了哪些值。我想我已经想好了如何遍历每一行，但我不知道如何访问控件。这是我对事件处理程序的了解，该事件处理程序用于单击按钮循环通过子级sizer：
void MyFrame::Calculate(wxCommandEvent &event)
{
wxString output = "Calculating...";
// get children in the sizer
wxSizerItemList children = row_wrap_sizer->GetChildren();
// loop through each child (a node?)
for (wxSizerItemList::Node *node = children.GetFirst(); node; node = node->GetNext())
{
output += wxT("Child...");
}
log_output->SetValue(output);
}
这在子节点中循环，但当我循环时，我不知道如何找到每个节点中的控件并检查它们的值。例如，每个子行包含一个wxComboBox，其名称为"；Combo1"；，我需要在每一行中找到它，并在迭代时检查它的值。
此外，重要的是，我要按照它们在父sizer中出现的顺序迭代每一行，我不确定我的代码是否在这样做，但我没有办法进行测试，因为我无法访问每个sizer 中的控件
这是从最小wxWidgdets示例修改的整个代码，因此应该只是即插即用：
// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all "standard" wxWidgets headers)
#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif
// ----------------------------------------------------------------------------
// resources
// ----------------------------------------------------------------------------
// the application icon (under Windows and OS/2 it is in resources and even
// though we could still include the XPM here it would be unused)
#ifndef wxHAS_IMAGES_IN_RESOURCES
#include "../sample.xpm"
#endif
#include <vector>
// Define a new application type, each program should derive a class from wxApp
class MyApp : public wxApp
{
public:
// override base class virtuals
// ----------------------------
// this one is called on application startup and is a good place for the app
// initialization (doing it here and not in the ctor allows to have an error
// return: if OnInit() returns false, the application terminates)
virtual bool OnInit();
};
// Define a new frame type: this is going to be our main frame
class MyFrame : public wxFrame
{
public:
// ctor(s)
MyFrame(const wxString& title);
// event handlers (these functions should _not_ be virtual)
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
private:
// any class wishing to process wxWidgets events must use this macro
wxDECLARE_EVENT_TABLE();
wxPanel *main_panel;
wxTextCtrl *log_output;
wxBoxSizer *row_wrap_sizer;
void Calculate(wxCommandEvent& event);
};
// IDs for the controls and the menu commands
enum
{
// menu items
Minimal_Quit = wxID_EXIT,
// it is important for the id corresponding to the "About" command to have
// this standard value as otherwise it won't be handled properly under Mac
// (where it is special and put into the "Apple" menu)
Minimal_About = wxID_ABOUT
};
// the event tables connect the wxWidgets events with the functions (event
// handlers) which process them. It can be also done at run-time, but for the
// simple menu events like this the static method is much simpler.
wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(Minimal_Quit, MyFrame::OnQuit)
EVT_MENU(Minimal_About, MyFrame::OnAbout)
wxEND_EVENT_TABLE()
// Create a new application object: this macro will allow wxWidgets to create
// the application object during program execution (it's better than using a
// static object for many reasons) and also implements the accessor function
// wxGetApp() which will return the reference of the right type (i.e. MyApp and
// not wxApp)
IMPLEMENT_APP(MyApp)
// 'Main program' equivalent: the program execution "starts" here
bool MyApp::OnInit()
{
// call the base class initialization method, currently it only parses a
// few common command-line options but it could be do more in the future
if ( !wxApp::OnInit() )
return false;
// create the main application window
MyFrame *frame = new MyFrame("Minimal wxWidgets App");
// and show it (the frames, unlike simple controls, are not shown when
// created initially)
frame->Show(true);
// success: wxApp::OnRun() will be called which will enter the main message
// loop and the application will run. If we returned false here, the
// application would exit immediately.
return true;
}
// ----------------------------------------------------------------------------
// main frame
// ----------------------------------------------------------------------------
// frame constructor
MyFrame::MyFrame(const wxString& title)
: wxFrame(NULL, wxID_ANY, title)
{
// set the frame icon
SetIcon(wxICON(sample));
#if wxUSE_MENUS
// create a menu bar
wxMenu *fileMenu = new wxMenu;
// the "About" item should be in the help menu
wxMenu *helpMenu = new wxMenu;
helpMenu->Append(Minimal_About, "&AbouttF1", "Show about dialog");
fileMenu->Append(Minimal_Quit, "E&xittAlt-X", "Quit this program");
// now append the freshly created menu to the menu bar...
wxMenuBar *menuBar = new wxMenuBar();
menuBar->Append(fileMenu, "&File");
menuBar->Append(helpMenu, "&Help");
// ... and attach this menu bar to the frame
SetMenuBar(menuBar);
#endif // wxUSE_MENUS
#if wxUSE_STATUSBAR
// create a status bar just for fun (by default with 1 pane only)
CreateStatusBar(2);
SetStatusText("Welcome to wxWidgets!");
#endif // wxUSE_STATUSBAR
// mainPanel
main_panel = new wxPanel(this, wxID_ANY);
// main_panel_sizer (vertical)
// goes onto the panel, contains 3 sizers
wxBoxSizer *main_panel_sizer = new wxBoxSizer(wxVERTICAL);
// sizer 1: but_wrap_sizer, contains row of buttons along top
wxBoxSizer *but_wrap_sizer = new wxBoxSizer(wxHORIZONTAL);
main_panel_sizer->Add(but_wrap_sizer, wxSizerFlags(1).Expand());
wxButton *go_but = new wxButton(this->main_panel, wxID_ANY, "GO");
go_but->Bind(wxEVT_BUTTON, &MyFrame::Calculate, this);
but_wrap_sizer->Add(go_but, wxSizerFlags(1).Expand());
// sizer 2: output_sizer, contains a txtctrl we can log output to
wxBoxSizer *output_sizer = new wxBoxSizer(wxHORIZONTAL);
main_panel_sizer->Add(output_sizer, wxSizerFlags(1).Expand());
log_output = new wxTextCtrl(main_panel, wxID_ANY, "");
output_sizer->Add(log_output, wxSizerFlags(1).Expand());
// sizer 3: row_wrap_sizer, contains a bunch of rows of data,
// each row it contains is itself a sizer and contains the same controls,
// but controls can be set to have diff values
row_wrap_sizer = new wxBoxSizer(wxVERTICAL);
main_panel_sizer->Add(row_wrap_sizer, wxSizerFlags(1).Expand());
for ( unsigned int i = 0; i < 3; i++ )
{
wxBoxSizer *row_sizer = new wxBoxSizer(wxHORIZONTAL);
row_wrap_sizer->Add(row_sizer, wxSizerFlags(1).Expand());
std::vector<wxString> filters_in_deck;
filters_in_deck.push_back("A");
filters_in_deck.push_back("B");
filters_in_deck.push_back("C");
wxGridSizer *checkbox_sizer = new wxGridSizer(1, 3, 0, 0);
row_sizer->Add(checkbox_sizer, wxSizerFlags(0).Expand());
for ( unsigned int i = 0; i < filters_in_deck.size(); i++ )
{
wxCheckBox *filter_check = new wxCheckBox(this->main_panel, wxID_ANY, "filter " + filters_in_deck[i], wxDefaultPosition, wxDefaultSize, 0, wxDefaultValidator, "Checkbox");
checkbox_sizer->Add(filter_check, wxSizerFlags(1).Expand());
}
wxComboBox *combo_box_a = new wxComboBox(this->main_panel, wxID_ANY, wxEmptyString);
combo_box_a->SetName("Combo1");
combo_box_a->Append("Any");
combo_box_a->Append("All");
row_sizer->Add(combo_box_a, wxSizerFlags(1).Expand());
wxComboBox *combo_box_b = new wxComboBox(this->main_panel, wxID_ANY);
combo_box_a->SetName("Combo2");
combo_box_b->Append("If");
combo_box_b->Append("Or");
row_sizer->Add(combo_box_b, wxSizerFlags(1).Expand());
}
// done
main_panel->SetSizerAndFit(main_panel_sizer);
this->Fit();
}
void MyFrame::Calculate(wxCommandEvent &event)
{
wxString output = "Calculating...";
// get children in the sizer
wxSizerItemList children = row_wrap_sizer->GetChildren();
// loop through each child (a node?)
for (wxSizerItemList::Node *node = children.GetFirst(); node; node = node->GetNext())
{
output += wxT("Child...");
//wxSizerItem child_sizer = node.GetData().GetSizer();
}
log_output->SetValue(output);
}
// event handlers
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
// true is to force the frame to close
Close(true);
}
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{
wxMessageBox(wxString::Format
(
"Welcome to %s!n"
"n"
"This is the minimal wxWidgets samplen"
"running under %s.",
wxVERSION_STRING,
wxGetOsDescription()
),
"About wxWidgets minimal sample",
wxOK | wxICON_INFORMATION,
this);
}
最简单的方法是为sizer中的每个控件分配一个id，而不是使用wxID_ANY。
如果您想知道类型dynamic_cast()或wxDynamicCast()会有所帮助。