如何更改我的代码，以便我可以调用`Bind()`函数，而不是使用事件表？

huangapple
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英文:

How should I change my code so that I can call the Bind() function instead of using the event table?

问题

I am using WxWidgets 3.2 for my C++ Windows application.

I need to pass data (eg login) from one class to another. To do this, I create a custom event and use the event table to bind the event to the handler.

For example, I have a LoginPanel class and I want to pass the login entered by the user to another class - MainFrame.

LoginPanel.h

  1. DECLARE_EVENT_TYPE(LOGIN_ENTERED, wxCommandEvent)
  3. enum class Buttons_ID {
  4.     ID_CONNECT_BUTTON = wxID_HIGHEST + 1,
  5. };
  7. class LoginPanel : public wxPanel {
  8. public:
  9.     LoginPanel(wxWindow* parent, wxWindowID id = wxID_ANY);
  11. private:
  12.     void OnConnectButton(wxCommandEvent& event);
  13.     wxTextCtrl* usernameInput;
  14. };

LoginPanel.cpp

  1. DEFINE_EVENT_TYPE(LOGIN_ENTERED)
  2. LoginPanel::LoginPanel(wxWindow* parent, wxWindowID id)
  3.     : wxPanel(parent, id) {
  4. 	wxButton* connectButton = new wxButton(loginTab, wxID_ANY, "Connect");
  5.     connectButton->Bind(wxEVT_BUTTON, &LoginPanel::OnConnectButton, this);
  6. }
  8. void LoginPanel::OnConnectButton(wxCommandEvent& event) {
  9.     wxString username = usernameInput->GetValue();
  10.     wxCommandEvent loginEvent(LOGIN_ENTERED, GetId());
  11.     loginEvent.SetString(username);
  12.     GetParent()->GetEventHandler()->ProcessEvent(loginEvent);
  13. }

MainFrame.h

  1. class MainFrame : public wxFrame {
  2. public:
  3.     MainFrame(const wxString& title);
  4.     ~MainFrame();
  6. private:
  7.     LoginPanel * loginPanel;           
  9. public:
  10.     void ShowLoginPanel();
  11.     void OnLoginEntered(wxCommandEvent& event);
  12.     wxDECLARE_EVENT_TABLE(); 
  13. };

MainFrame.cpp

  1. wxBEGIN_EVENT_TABLE(MainFrame, wxFrame)                             
  2.     EVT_COMMAND(wxID_ANY, LOGIN_ENTERED, MainFrame::OnLoginEntered) 
  3. wxEND_EVENT_TABLE()                                                  
  5. MainFrame::MainFrame(const wxString& title)
  6.     : wxFrame(nullptr, wxID_ANY, title, wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE & ~wxRESIZE_BORDER) {
  7.     wxBoxSizer* mainSizer = new wxBoxSizer(wxVERTICAL);
  9.     loginPanel = new LoginPanel(this, wxID_ANY);
  10.     mainSizer->Add(loginPanel, 1, wxEXPAND);
  11.     SetSizer(mainSizer);
  12.     ShowLoginPanel();
  13. }
  15. void MainFrame::OnLoginEntered(wxCommandEvent& event) {
  16.     auto login = event.GetString();
  17. }

This is how the code works and the LOGIN_ENTERED event is normally passed from the LoginPanel class to the OnConnectButton() handler of the MainFrame class.

Since using the event table is not very modern now, I want to use the Bind() function. I call the Bind() function in the constructor of the MainFrame class:

  1. loginPanel->Bind(LOGIN_ENTERED, &MainFrame::OnLoginEntered, this);

However, the problem is that an error occurs:

C2664: 'void wxEventFunctorMethod<EventTag,MainFrame,EventArg,EventHandler>::CheckHandlerArgument(EventArg *)': cannot convert argument 1 from 'wxEvent *' to 'EventArg *'

How should I change my code so that I can call the Bind() function instead of using the event table?

英文:

I am using WxWidgets 3.2 for my C++ Windows application.

I need to pass data (eg login) from one class to another. To do this, I create a custom event and use the event table to bind the event to the handler.

For example, I have a LoginPanel class and I want to pass the login entered by the user to another class - MainFrame.

LoginPanel.h

  1. DECLARE_EVENT_TYPE(LOGIN_ENTERED, wxCommandEvent)
  3. enum class Buttons_ID {
  4.     ID_CONNECT_BUTTON = wxID_HIGHEST + 1,
  5. };
  7. class LoginPanel : public wxPanel {
  8. public:
  9.     LoginPanel(wxWindow* parent, wxWindowID id = wxID_ANY);
  11. private:
  12.     void OnConnectButton(wxCommandEvent&amp; event);
  13.     wxTextCtrl* usernameInput;
  14. };

LoginPanel.cpp

  1. DEFINE_EVENT_TYPE(LOGIN_ENTERED)
  2. LoginPanel::LoginPanel(wxWindow* parent, wxWindowID id)
  3.     : wxPanel(parent, id) {
  4. 	wxButton* connectButton = new wxButton(loginTab, wxID_ANY, &quot;Connect&quot;);
  5.     connectButton-&gt;Bind(wxEVT_BUTTON, &amp;LoginPanel::OnConnectButton, this);
  6. }
  8. void LoginPanel::OnConnectButton(wxCommandEvent&amp; event) {
  9.     wxString username = usernameInput-&gt;GetValue();
  10.     wxCommandEvent loginEvent(LOGIN_ENTERED, GetId());
  11.     loginEvent.SetString(username);
  12.     GetParent()-&gt;GetEventHandler()-&gt;ProcessEvent(loginEvent);
  13. }

MainFrame.h

  1. class MainFrame : public wxFrame {
  2. public:
  3.     MainFrame(const wxString&amp; title);
  4.     ~MainFrame();
  6. private:
  7.     LoginPanel * loginPanel;           
  9. public:
  10.     void ShowLoginPanel();
  11.     void OnLoginEntered(wxCommandEvent&amp; event);
  12.     wxDECLARE_EVENT_TABLE(); 
  13. };

MainFrame.cpp

  1. wxBEGIN_EVENT_TABLE(ChessFrame, wxFrame)                             
  2.     EVT_COMMAND(wxID_ANY, LOGIN_ENTERED, ChessFrame::OnLoginEntered) 
  3. wxEND_EVENT_TABLE()                                                  
  5. MainFrameFrame::MainFrameFrame(const wxString&amp; title)
  6.     : wxFrame(nullptr, wxID_ANY, title, wxDefaultPosition, wxDefaultSize, wxDEFAULT_FRAME_STYLE &amp; ~wxRESIZE_BORDER) {
  7.     wxBoxSizer* mainSizer = new wxBoxSizer(wxVERTICAL);
  9.     loginPanel = new LoginPanel(this, wxID_ANY);
  10.     mainSizer-&gt;Add(loginPanel, 1, wxEXPAND);
  11.     SetSizer(mainSizer);
  12.     ShowLoginPanel();
  13. }
  15. void MainFrameFrame::OnLoginEntered(wxCommandEvent&amp; event) {
  16.     auto login = event.GetString();
  17. }

This is how the code works and the LOGIN_ENTERED event is normally passed from the LoginPanel class to the OnConnectButton() handler of the MainFrame class.

Since using the event table is not very modern now, I want to use the Bind() function. I call the Bind() function in the constructor of the MainFrame class:

  1. loginPanel-&gt;Bind(LOGIN_ENTERED, &amp;ChessFrame::OnLoginEntered, this);

However, the problem is that an error occurs:

  1. C2664: &#39;void wxEventFunctorMethod&lt;EventTag,ChessFrame,EventArg,EventHandler&gt;::CheckHandlerArgument(EventArg *)&#39;: cannot convert argument 1 from &#39;wxEvent *&#39; to &#39;EventArg *&#39;

How should I change my code so that I can call the Bind() function instead of using the event table?

答案1

得分: 1

我认为主要问题是您用于声明/定义新事件的宏。您应该使用 wxDECLARE_EVENT 和 wxDEFINE_EVENT。

简而言之，将以下代码更改为：

  1. wxDECLARE_EVENT(LOGIN_ENTERED, wxCommandEvent);

和

  1. wxDEFINE_EVENT(LOGIN_ENTERED, wxCommandEvent);

此外，我建议将以下代码更改为：

  1. ProcessWindowEvent(loginEvent);

如果窗口本身未处理命令事件，这些事件将向上过滤到父窗口。

英文:

I think the main issue is the macro you're using to declare/define your new events. You should use wxDECLARE_EVENT and wxDEFINE_EVENT instead.

In short, change

  1. DECLARE_EVENT_TYPE(LOGIN_ENTERED, wxCommandEvent)

to

  1. wxDECLARE_EVENT(LOGIN_ENTERED, wxCommandEvent);

and

  1. DEFINE_EVENT_TYPE(LOGIN_ENTERED)

to

  1. wxDEFINE_EVENT(LOGIN_ENTERED, wxCommandEvent);

Also, I would suggest changing

  1. GetParent()-&gt;GetEventHandler()-&gt;ProcessEvent(loginEvent);

to simply

  1. ProcessWindowEvent(loginEvent);

Command events will filter up to the parent windows if not handled by the window itself.

huangapple
  • 本文由 发表于 2023年7月31日 23:43:54
  • 转载请务必保留本文链接：https://go.coder-hub.com/76805182.html
  • c++
  • events
  • wxwidgets
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