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[wxWidgets.git] / samples / event / event.cpp

diff --git a/samples/event/event.cpp b/samples/event/event.cpp
index 1f63f7efd164bbc0f43f7c2433765199cfa85e55..9c898852312c4db67246b1f39ad38cd12d2ee985 100644 (file)
--- a/samples/event/event.cpp
+++ b/samples/event/event.cpp
@@ -1,11 +1,11 @@
 /////////////////////////////////////////////////////////////////////////////
 // Name:        event.cpp
 /////////////////////////////////////////////////////////////////////////////
 // Name:        event.cpp

-// Purpose:     wxWindows sample demonstrating different event usage
+// Purpose:     wxWidgets sample demonstrating different event usage

 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     31.01.01
 // RCS-ID:      $Id$
 // Author:      Vadim Zeitlin
 // Modified by:
 // Created:     31.01.01
 // RCS-ID:      $Id$

-// Copyright:   (c) 2001 Vadim Zeitlin
+// Copyright:   (c) 2001-2009 Vadim Zeitlin

 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 


@@ -17,13 +17,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
 // headers
 // ----------------------------------------------------------------------------
 

-#ifdef __GNUG__
-    // DO NOT use event.cpp here, it breaks statics initialization in
-    // src/common/event.cpp and nothing works at all then!
-    #pragma implementation "eventsample.cpp"
-    #pragma interface "eventsample.cpp"
-#endif
-

 // For compilers that support precompilation, includes "wx/wx.h".
 #include "wx/wxprec.h"
 
 // For compilers that support precompilation, includes "wx/wx.h".
 #include "wx/wxprec.h"
 


@@ -32,35 +25,28 @@
 #endif
 
 // for all others, include the necessary headers (this file is usually all you
 #endif
 
 // for all others, include the necessary headers (this file is usually all you

-// need because it includes almost all "standard" wxWindows headers)
+// need because it includes almost all "standard" wxWidgets headers)

 #ifndef WX_PRECOMP
     #include "wx/wx.h"
 #endif
 
 #ifndef WX_PRECOMP
     #include "wx/wx.h"
 #endif
 

+#ifndef __WXMSW__
+    #include "../sample.xpm"
+#endif
+

 // ----------------------------------------------------------------------------
 // event constants
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 // event constants
 // ----------------------------------------------------------------------------
 

-// declare a custom event type
-//
-// note that in wxWin 2.3+ these macros expand simply into the following code:
-//
-//  extern const wxEventType wxEVT_MY_CUSTOM_COMMAND;
-//
-//  const wxEventType wxEVT_MY_CUSTOM_COMMAND = wxNewEventType();
-//
-// and you may use this code directly if you don't care about 2.2 compatibility
-BEGIN_DECLARE_EVENT_TYPES()
-    DECLARE_EVENT_TYPE(wxEVT_MY_CUSTOM_COMMAND, 7777)
-END_DECLARE_EVENT_TYPES()
-
-DEFINE_EVENT_TYPE(wxEVT_MY_CUSTOM_COMMAND)
+// define a custom event type (we don't need a separate declaration here but
+// usually you would use a matching wxDECLARE_EVENT in a header)
+wxDEFINE_EVENT(wxEVT_MY_CUSTOM_COMMAND, wxCommandEvent);

 
 // it may also be convenient to define an event table macro for this event type
 #define EVT_MY_CUSTOM_COMMAND(id, fn) \
     DECLARE_EVENT_TABLE_ENTRY( \
 
 // it may also be convenient to define an event table macro for this event type
 #define EVT_MY_CUSTOM_COMMAND(id, fn) \
     DECLARE_EVENT_TABLE_ENTRY( \

-        wxEVT_MY_CUSTOM_COMMAND, id, -1, \
-        (wxObjectEventFunction)(wxEventFunction)(wxCommandEventFunction)&fn, \
+        wxEVT_MY_CUSTOM_COMMAND, id, wxID_ANY, \
+        wxCommandEventHandler(fn), \

         (wxObject *) NULL \
     ),
 
         (wxObject *) NULL \
     ),
 


@@ -91,6 +77,9 @@ public:
 
     void OnQuit(wxCommandEvent& event);
     void OnAbout(wxCommandEvent& event);
 
     void OnQuit(wxCommandEvent& event);
     void OnAbout(wxCommandEvent& event);

+#if !wxEVENTS_COMPATIBILITY_2_8
+    void OnBind(wxCommandEvent& event);
+#endif // !wxEVENTS_COMPATIBILITY_2_8

     void OnConnect(wxCommandEvent& event);
     void OnDynamic(wxCommandEvent& event);
     void OnPushEventHandler(wxCommandEvent& event);
     void OnConnect(wxCommandEvent& event);
     void OnDynamic(wxCommandEvent& event);
     void OnPushEventHandler(wxCommandEvent& event);


@@ -102,12 +91,38 @@ public:
 
     void OnUpdateUIPop(wxUpdateUIEvent& event);
 
 
     void OnUpdateUIPop(wxUpdateUIEvent& event);
 

-protected:
+private:
+    // symbolic names for the status bar fields
+    enum
+    {
+        Status_Main = 0,
+        Status_Dynamic,
+        Status_Push
+    };
+
+    void UpdateDynamicStatus(bool on)
+    {
+#if wxUSE_STATUSBAR
+        if ( on )
+        {
+            SetStatusText("You can now use \"Dynamic\" item in the menu");
+            SetStatusText("Dynamic: on", Status_Dynamic);
+        }
+        else
+        {
+            SetStatusText("You can no more use \"Dynamic\" item in the menu");
+            SetStatusText("Dynamic: off", Status_Dynamic);
+        }
+#endif // wxUSE_STATUSBAR
+    }
+

     // number of pushed event handlers
     // number of pushed event handlers

-    size_t m_nPush;
+    unsigned m_nPush;

 
 

-private:
-    // any class wishing to process wxWindows events must use this macro
+    // the button to whose event we connect dynamically
+    wxButton *m_btnDynamic;
+
+    // any class wishing to process wxWidgets events must use this macro

     DECLARE_EVENT_TABLE()
 };
 
     DECLARE_EVENT_TABLE()
 };
 


@@ -127,7 +142,7 @@ public:
     }
 
 private:
     }
 
 private:

-    size_t m_level;
+    unsigned m_level;

 
     DECLARE_EVENT_TABLE()
 };
 
     DECLARE_EVENT_TABLE()
 };


@@ -142,6 +157,7 @@ enum
     // menu items
     Event_Quit = 1,
     Event_About,
     // menu items
     Event_Quit = 1,
     Event_About,

+    Event_Bind,

     Event_Connect,
     Event_Dynamic,
     Event_Push,
     Event_Connect,
     Event_Dynamic,
     Event_Push,


@@ -150,25 +166,20 @@ enum
     Event_Test
 };
 
     Event_Test
 };
 

-// status bar fields
-enum
-{
-    Status_Main = 0,
-    Status_Dynamic,
-    Status_Push
-};
-

 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------

-// event tables and other macros for wxWindows
+// event tables and other macros for wxWidgets

 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 

-// the event tables connect the wxWindows events with the functions (event
+// 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.
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
     EVT_MENU(Event_Quit,  MyFrame::OnQuit)
     EVT_MENU(Event_About, MyFrame::OnAbout)
 
 // 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.
 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
     EVT_MENU(Event_Quit,  MyFrame::OnQuit)
     EVT_MENU(Event_About, MyFrame::OnAbout)
 

+#if !wxEVENTS_COMPATIBILITY_2_8
+    EVT_MENU(Event_Bind, MyFrame::OnBind)
+#endif // !wxEVENTS_COMPATIBILITY_2_8

     EVT_MENU(Event_Connect, MyFrame::OnConnect)
 
     EVT_MENU(Event_Custom, MyFrame::OnFireCustom)
     EVT_MENU(Event_Connect, MyFrame::OnConnect)
 
     EVT_MENU(Event_Custom, MyFrame::OnFireCustom)


@@ -178,17 +189,18 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 
     EVT_UPDATE_UI(Event_Pop, MyFrame::OnUpdateUIPop)
 
 
     EVT_UPDATE_UI(Event_Pop, MyFrame::OnUpdateUIPop)
 

-    EVT_MY_CUSTOM_COMMAND(-1, MyFrame::OnProcessCustom)
+    EVT_MY_CUSTOM_COMMAND(wxID_ANY, MyFrame::OnProcessCustom)

 
 

-    // this would also work:
-    //EVT_CUSTOM(wxEVT_MY_CUSTOM_COMMAND, -1, MyFrame::OnProcessCustom)
+    // the line below would also work if OnProcessCustom() were defined as
+    // taking a wxEvent (as required by EVT_CUSTOM) and not wxCommandEvent
+    //EVT_CUSTOM(wxEVT_MY_CUSTOM_COMMAND, wxID_ANY, MyFrame::OnProcessCustom)

 END_EVENT_TABLE()
 
 BEGIN_EVENT_TABLE(MyEvtHandler, wxEvtHandler)
     EVT_MENU(Event_Test, MyEvtHandler::OnTest)
 END_EVENT_TABLE()
 
 END_EVENT_TABLE()
 
 BEGIN_EVENT_TABLE(MyEvtHandler, wxEvtHandler)
     EVT_MENU(Event_Test, MyEvtHandler::OnTest)
 END_EVENT_TABLE()
 

-// Create a new application object: this macro will allow wxWindows to create
+// 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 declares the accessor function
 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 // the application object during program execution (it's better than using a
 // static object for many reasons) and also declares the accessor function
 // wxGetApp() which will return the reference of the right type (i.e. MyApp and


@@ -206,18 +218,21 @@ IMPLEMENT_APP(MyApp)
 // 'Main program' equivalent: the program execution "starts" here
 bool MyApp::OnInit()
 {
 // 'Main program' equivalent: the program execution "starts" here
 bool MyApp::OnInit()
 {

+    if ( !wxApp::OnInit() )
+        return false;
+

     // create the main application window
     // create the main application window

-    MyFrame *frame = new MyFrame(_T("Event wxWindows Sample"),
+    MyFrame *frame = new MyFrame(_T("Event wxWidgets Sample"),

                                  wxPoint(50, 50), wxSize(600, 340));
 
     // and show it (the frames, unlike simple controls, are not shown when
     // created initially)
                                  wxPoint(50, 50), wxSize(600, 340));
 
     // and show it (the frames, unlike simple controls, are not shown when
     // created initially)

-    frame->Show(TRUE);
+    frame->Show(true);

 
     // success: wxApp::OnRun() will be called which will enter the main message
 
     // success: wxApp::OnRun() will be called which will enter the main message

-    // loop and the application will run. If we returned FALSE here, the
+    // loop and the application will run. If we returned false here, the

     // application would exit immediately.
     // application would exit immediately.

-    return TRUE;
+    return true;

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -226,10 +241,13 @@ bool MyApp::OnInit()
 
 // frame constructor
 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 
 // frame constructor
 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)

-       : wxFrame((wxFrame *)NULL, -1, title, pos, size)
+       : wxFrame(NULL, wxID_ANY, title, pos, size)

 {
 {

+    SetIcon(wxICON(sample));
+

     // init members
     m_nPush = 0;
     // init members
     m_nPush = 0;

+    m_btnDynamic = NULL;

 
     // create a menu bar
     wxMenu *menuFile = new wxMenu;
 
     // create a menu bar
     wxMenu *menuFile = new wxMenu;


@@ -239,9 +257,12 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
     menuFile->Append(Event_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 
     wxMenu *menuEvent = new wxMenu;
     menuFile->Append(Event_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
 
     wxMenu *menuEvent = new wxMenu;

-    menuEvent->Append(Event_Connect, _T("&Connect\tCtrl-C"),
-                     _T("Connect or disconnect the dynamic event handler"),
-                     TRUE /* checkable */);
+#if !wxEVENTS_COMPATIBILITY_2_8
+    menuEvent->AppendCheckItem(Event_Bind, "&Bind\tCtrl-B",
+                               "Bind or unbind a dynamic event handler");
+#endif // !wxEVENTS_COMPATIBILITY_2_8
+    menuEvent->AppendCheckItem(Event_Connect, _T("&Connect\tCtrl-C"),
+                     _T("Connect or disconnect the dynamic event handler"));

     menuEvent->Append(Event_Dynamic, _T("&Dynamic event\tCtrl-D"),
                       _T("Dynamic event sample - only works after Connect"));
     menuEvent->AppendSeparator();
     menuEvent->Append(Event_Dynamic, _T("&Dynamic event\tCtrl-D"),
                       _T("Dynamic event sample - only works after Connect"));
     menuEvent->AppendSeparator();


@@ -265,10 +286,20 @@ MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 
 #if wxUSE_STATUSBAR
     CreateStatusBar(3);
 
 #if wxUSE_STATUSBAR
     CreateStatusBar(3);

-    SetStatusText(_T("Welcome to wxWindows event sample"));
+    SetStatusText(_T("Welcome to wxWidgets event sample"));

     SetStatusText(_T("Dynamic: off"), Status_Dynamic);
     SetStatusText(_T("Push count: 0"), Status_Push);
 #endif // wxUSE_STATUSBAR
     SetStatusText(_T("Dynamic: off"), Status_Dynamic);
     SetStatusText(_T("Push count: 0"), Status_Push);
 #endif // wxUSE_STATUSBAR

+
+    wxPanel * const panel = new wxPanel(this);
+    wxSizer * const sizer = new wxBoxSizer(wxHORIZONTAL);
+    const wxSizerFlags centreY(wxSizerFlags().Centre().Border());
+    sizer->Add(new wxStaticText(panel, wxID_ANY,
+        "This button will only work if its handler is dynamically connected"),
+        centreY);
+    m_btnDynamic = new wxButton(panel, Event_Dynamic, "&Dynamic button");
+    sizer->Add(m_btnDynamic, centreY);
+    panel->SetSizer(sizer);

 }
 
 MyFrame::~MyFrame()
 }
 
 MyFrame::~MyFrame()


@@ -277,7 +308,7 @@ MyFrame::~MyFrame()
     // crashes!
     while ( m_nPush-- != 0 )
     {
     // crashes!
     while ( m_nPush-- != 0 )
     {

-        PopEventHandler(TRUE /* delete handler */);
+        PopEventHandler(true /* delete handler */);

     }
 }
 
     }
 }
 


@@ -287,48 +318,89 @@ MyFrame::~MyFrame()
 
 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 {
 
 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 {

-    // TRUE is to force the frame to close
-    Close(TRUE);
+    // true is to force the frame to close
+    Close(true);

 }
 
 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 {
 }
 
 void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 {

-    wxMessageBox(_T("Event sample shows different ways of using events\n"
-                    "© 2001 Vadim Zeitlin"),
-                 _T("About Event Sample"), wxOK | wxICON_INFORMATION, this);
+    wxMessageBox("Event sample shows different ways of using events\n"
+                 "(c) 2001-2009 Vadim Zeitlin",
+                 "About wxWidgets Event Sample",
+                 wxOK | wxICON_INFORMATION, this);

 }
 
 // ----------------------------------------------------------------------------
 // dynamic event handling stuff
 // ----------------------------------------------------------------------------
 
 }
 
 // ----------------------------------------------------------------------------
 // dynamic event handling stuff
 // ----------------------------------------------------------------------------
 

-void MyFrame::OnDynamic(wxCommandEvent& WXUNUSED(event))
+void MyFrame::OnDynamic(wxCommandEvent& event)

 {
 {

-    wxMessageBox(_T("This is a dynamic event handler which can be connected "
-                    "and disconnected during run-time."),
-                 _T("Dynamic Event Handler"), wxOK | wxICON_INFORMATION, this);
+    wxString origin;
+    if ( event.GetEventObject() == this )
+        origin = "menu item";
+    else if ( event.GetEventObject() == m_btnDynamic )
+        origin = "button";
+    else
+        origin = "unknown event source";
+
+    wxMessageBox
+    (
+        "This message box is shown from the dynamically connected "
+        "event handler in response to event generated by " + origin,
+        "wxWidgets Event Sample", wxOK | wxICON_INFORMATION, this
+    );

 }
 
 }
 

-void MyFrame::OnConnect(wxCommandEvent& event)
+#if !wxEVENTS_COMPATIBILITY_2_8
+
+void MyFrame::OnBind(wxCommandEvent& event)

 {
     if ( event.IsChecked() )
     {
 {
     if ( event.IsChecked() )
     {

-        // disconnect
-        Connect(Event_Dynamic, -1, wxEVT_COMMAND_MENU_SELECTED,
-                (wxObjectEventFunction)
-                (wxEventFunction)
-                (wxCommandEventFunction)&MyFrame::OnDynamic);
-
-        SetStatusText(_T("You can now use \"Dynamic\" item in the menu"));
-        SetStatusText(_T("Dynamic: on"), Status_Dynamic);
+        // as we bind directly to the button, there is no need to use an id
+        // here: the button will only ever get its own events
+        m_btnDynamic->Bind(wxEVT_COMMAND_BUTTON_CLICKED, &MyFrame::OnDynamic,
+                           this);
+
+        // but we do need the id for the menu command as the frame gets all of
+        // them
+        Bind(wxEVT_COMMAND_MENU_SELECTED, &MyFrame::OnDynamic, this,
+             Event_Dynamic);

     }
     }

-    else // connect
+    else // disconnect

     {
     {

-        Disconnect(Event_Dynamic, -1, wxEVT_COMMAND_MENU_SELECTED);
+        m_btnDynamic->Unbind(wxEVT_COMMAND_BUTTON_CLICKED,
+                             &MyFrame::OnDynamic, this);
+        Unbind(wxEVT_COMMAND_MENU_SELECTED, &MyFrame::OnDynamic, this,
+               Event_Dynamic);
+    }

 
 

-        SetStatusText(_T("You can no more use \"Dynamic\" item in the menu"));
-        SetStatusText(_T("Dynamic: off"), Status_Dynamic);
+    UpdateDynamicStatus(event.IsChecked());
+}
+
+#endif // !wxEVENTS_COMPATIBILITY_2_8
+
+void MyFrame::OnConnect(wxCommandEvent& event)
+{
+    if ( event.IsChecked() )
+    {
+        m_btnDynamic->Connect(wxID_ANY, wxEVT_COMMAND_BUTTON_CLICKED,
+                              wxCommandEventHandler(MyFrame::OnDynamic),
+                              NULL, this);
+        Connect(Event_Dynamic, wxEVT_COMMAND_MENU_SELECTED,
+                wxCommandEventHandler(MyFrame::OnDynamic));

     }
     }

+    else // disconnect
+    {
+        m_btnDynamic->Disconnect(wxID_ANY, wxEVT_COMMAND_BUTTON_CLICKED,
+                                 wxCommandEventHandler(MyFrame::OnDynamic),
+                                 NULL, this);
+        Disconnect(Event_Dynamic, wxEVT_COMMAND_MENU_SELECTED,
+                   wxCommandEventHandler(MyFrame::OnDynamic));
+    }
+
+    UpdateDynamicStatus(event.IsChecked());

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -339,20 +411,24 @@ void MyFrame::OnPushEventHandler(wxCommandEvent& WXUNUSED(event))
 {
     PushEventHandler(new MyEvtHandler(++m_nPush));
 
 {
     PushEventHandler(new MyEvtHandler(++m_nPush));
 

+#if wxUSE_STATUSBAR

     SetStatusText(wxString::Format(_T("Push count: %u"), m_nPush), Status_Push);
     SetStatusText(wxString::Format(_T("Push count: %u"), m_nPush), Status_Push);

+#endif // wxUSE_STATUSBAR

 }
 
 void MyFrame::OnPopEventHandler(wxCommandEvent& WXUNUSED(event))
 {
     wxCHECK_RET( m_nPush, _T("this command should be disabled!") );
 
 }
 
 void MyFrame::OnPopEventHandler(wxCommandEvent& WXUNUSED(event))
 {
     wxCHECK_RET( m_nPush, _T("this command should be disabled!") );
 

-    PopEventHandler(TRUE /* delete handler */);
+    PopEventHandler(true /* delete handler */);

     m_nPush--;
 
     m_nPush--;
 

+#if wxUSE_STATUSBAR

     SetStatusText(wxString::Format(_T("Push count: %u"), m_nPush), Status_Push);
     SetStatusText(wxString::Format(_T("Push count: %u"), m_nPush), Status_Push);

+#endif // wxUSE_STATUSBAR

 }
 
 }
 

-void MyFrame::OnTest(wxCommandEvent& event)
+void MyFrame::OnTest(wxCommandEvent& WXUNUSED(event))

 {
     wxLogMessage(_T("This is the test event handler in the main frame"));
 }
 {
     wxLogMessage(_T("This is the test event handler in the main frame"));
 }


@@ -366,14 +442,14 @@ void MyFrame::OnUpdateUIPop(wxUpdateUIEvent& event)
 // custom event methods
 // ----------------------------------------------------------------------------
 
 // custom event methods
 // ----------------------------------------------------------------------------
 

-void MyFrame::OnFireCustom(wxCommandEvent& event)
+void MyFrame::OnFireCustom(wxCommandEvent& WXUNUSED(event))

 {
     wxCommandEvent eventCustom(wxEVT_MY_CUSTOM_COMMAND);
 
     wxPostEvent(this, eventCustom);
 }
 
 {
     wxCommandEvent eventCustom(wxEVT_MY_CUSTOM_COMMAND);
 
     wxPostEvent(this, eventCustom);
 }
 

-void MyFrame::OnProcessCustom(wxCommandEvent& event)
+void MyFrame::OnProcessCustom(wxCommandEvent& WXUNUSED(event))

 {
     wxLogMessage(_T("Got a custom event!"));
 }
 {
     wxLogMessage(_T("Got a custom event!"));
 }