2001-01-31 11:00:00 -05:00
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/////////////////////////////////////////////////////////////////////////////
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// Name: event.cpp
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2004-05-25 07:20:37 -04:00
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// Purpose: wxWidgets sample demonstrating different event usage
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2001-01-31 11:00:00 -05:00
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 31.01.01
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// RCS-ID: $Id$
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// Copyright: (c) 2001 Vadim Zeitlin
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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2002-08-31 18:31:03 -04:00
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#if defined(__GNUG__) && !defined(__APPLE__)
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2001-01-31 11:00:00 -05:00
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// DO NOT use event.cpp here, it breaks statics initialization in
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// src/common/event.cpp and nothing works at all then!
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#pragma implementation "eventsample.cpp"
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#pragma interface "eventsample.cpp"
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#endif
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// For compilers that support precompilation, includes "wx/wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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// for all others, include the necessary headers (this file is usually all you
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2004-05-25 07:20:37 -04:00
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// need because it includes almost all "standard" wxWidgets headers)
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2001-01-31 11:00:00 -05:00
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#ifndef WX_PRECOMP
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#include "wx/wx.h"
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#endif
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2001-12-14 18:38:33 -05:00
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// ----------------------------------------------------------------------------
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// event constants
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// ----------------------------------------------------------------------------
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// declare a custom event type
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//
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// note that in wxWin 2.3+ these macros expand simply into the following code:
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//
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// extern const wxEventType wxEVT_MY_CUSTOM_COMMAND;
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//
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// const wxEventType wxEVT_MY_CUSTOM_COMMAND = wxNewEventType();
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//
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// and you may use this code directly if you don't care about 2.2 compatibility
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BEGIN_DECLARE_EVENT_TYPES()
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DECLARE_EVENT_TYPE(wxEVT_MY_CUSTOM_COMMAND, 7777)
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END_DECLARE_EVENT_TYPES()
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DEFINE_EVENT_TYPE(wxEVT_MY_CUSTOM_COMMAND)
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// it may also be convenient to define an event table macro for this event type
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#define EVT_MY_CUSTOM_COMMAND(id, fn) \
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DECLARE_EVENT_TABLE_ENTRY( \
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wxEVT_MY_CUSTOM_COMMAND, id, wxID_ANY, \
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(wxObjectEventFunction)(wxEventFunction) wxStaticCastEvent( wxCommandEventFunction, &fn ), \
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2001-12-14 18:38:33 -05:00
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(wxObject *) NULL \
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),
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2001-01-31 11:00:00 -05:00
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// ----------------------------------------------------------------------------
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// private classes
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// ----------------------------------------------------------------------------
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// Define a new application type, each program should derive a class from wxApp
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class MyApp : public wxApp
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{
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public:
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// override base class virtuals
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// ----------------------------
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// this one is called on application startup and is a good place for the app
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// initialization (doing it here and not in the ctor allows to have an error
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// return: if OnInit() returns false, the application terminates)
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virtual bool OnInit();
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};
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// Define a new frame type: this is going to be our main frame
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class MyFrame : public wxFrame
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{
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public:
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// ctor(s)
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MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
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virtual ~MyFrame();
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void OnQuit(wxCommandEvent& event);
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void OnAbout(wxCommandEvent& event);
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void OnConnect(wxCommandEvent& event);
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void OnDynamic(wxCommandEvent& event);
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void OnPushEventHandler(wxCommandEvent& event);
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void OnPopEventHandler(wxCommandEvent& event);
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void OnTest(wxCommandEvent& event);
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2001-12-14 18:38:33 -05:00
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void OnFireCustom(wxCommandEvent& event);
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void OnProcessCustom(wxCommandEvent& event);
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2001-01-31 11:00:00 -05:00
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void OnUpdateUIPop(wxUpdateUIEvent& event);
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protected:
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// number of pushed event handlers
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size_t m_nPush;
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private:
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// any class wishing to process wxWidgets events must use this macro
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2001-01-31 11:00:00 -05:00
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DECLARE_EVENT_TABLE()
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};
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// Define a custom event handler
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class MyEvtHandler : public wxEvtHandler
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{
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public:
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MyEvtHandler(size_t level) { m_level = level; }
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void OnTest(wxCommandEvent& event)
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{
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wxLogMessage(_T("This is the pushed test event handler #%u"), m_level);
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// if we don't skip the event, the other event handlers won't get it:
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// try commenting out this line and see what changes
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event.Skip();
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}
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private:
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size_t m_level;
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DECLARE_EVENT_TABLE()
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};
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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// IDs for the controls and the menu commands
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enum
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{
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// menu items
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Event_Quit = 1,
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Event_About,
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Event_Connect,
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Event_Dynamic,
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Event_Push,
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Event_Pop,
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Event_Custom,
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Event_Test
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};
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// status bar fields
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enum
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{
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Status_Main = 0,
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Status_Dynamic,
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Status_Push
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};
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// ----------------------------------------------------------------------------
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2004-05-25 07:20:37 -04:00
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// event tables and other macros for wxWidgets
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2001-01-31 11:00:00 -05:00
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// ----------------------------------------------------------------------------
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2004-05-25 07:20:37 -04:00
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// the event tables connect the wxWidgets events with the functions (event
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2001-01-31 11:00:00 -05:00
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// handlers) which process them. It can be also done at run-time, but for the
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// simple menu events like this the static method is much simpler.
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BEGIN_EVENT_TABLE(MyFrame, wxFrame)
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EVT_MENU(Event_Quit, MyFrame::OnQuit)
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EVT_MENU(Event_About, MyFrame::OnAbout)
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EVT_MENU(Event_Connect, MyFrame::OnConnect)
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EVT_MENU(Event_Custom, MyFrame::OnFireCustom)
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EVT_MENU(Event_Test, MyFrame::OnTest)
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EVT_MENU(Event_Push, MyFrame::OnPushEventHandler)
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EVT_MENU(Event_Pop, MyFrame::OnPopEventHandler)
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EVT_UPDATE_UI(Event_Pop, MyFrame::OnUpdateUIPop)
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2004-05-28 06:43:39 -04:00
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EVT_MY_CUSTOM_COMMAND(wxID_ANY, MyFrame::OnProcessCustom)
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2004-06-22 19:25:46 -04:00
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// the line below would also work if OnProcessCustom() were defined as
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// taking a wxEvent (as required by EVT_CUSTOM) and not wxCommandEvent
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//EVT_CUSTOM(wxEVT_MY_CUSTOM_COMMAND, wxID_ANY, MyFrame::OnProcessCustom)
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END_EVENT_TABLE()
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BEGIN_EVENT_TABLE(MyEvtHandler, wxEvtHandler)
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EVT_MENU(Event_Test, MyEvtHandler::OnTest)
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END_EVENT_TABLE()
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// Create a new application object: this macro will allow wxWidgets to create
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// the application object during program execution (it's better than using a
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// static object for many reasons) and also declares the accessor function
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// wxGetApp() which will return the reference of the right type (i.e. MyApp and
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// not wxApp)
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IMPLEMENT_APP(MyApp)
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// ============================================================================
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// implementation
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// ============================================================================
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// ----------------------------------------------------------------------------
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// the application class
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// ----------------------------------------------------------------------------
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// 'Main program' equivalent: the program execution "starts" here
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bool MyApp::OnInit()
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{
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// create the main application window
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MyFrame *frame = new MyFrame(_T("Event wxWidgets Sample"),
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wxPoint(50, 50), wxSize(600, 340));
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// and show it (the frames, unlike simple controls, are not shown when
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// created initially)
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frame->Show(true);
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// success: wxApp::OnRun() will be called which will enter the main message
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// loop and the application will run. If we returned false here, the
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// application would exit immediately.
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return true;
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}
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// ----------------------------------------------------------------------------
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// main frame
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// ----------------------------------------------------------------------------
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// frame constructor
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MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
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: wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
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{
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2001-05-27 09:21:16 -04:00
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// init members
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m_nPush = 0;
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2001-01-31 11:00:00 -05:00
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// create a menu bar
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wxMenu *menuFile = new wxMenu;
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2001-12-14 18:38:33 -05:00
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menuFile->Append(Event_About, _T("&About...\tCtrl-A"), _T("Show about dialog"));
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menuFile->AppendSeparator();
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menuFile->Append(Event_Quit, _T("E&xit\tAlt-X"), _T("Quit this program"));
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wxMenu *menuEvent = new wxMenu;
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menuEvent->Append(Event_Connect, _T("&Connect\tCtrl-C"),
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_T("Connect or disconnect the dynamic event handler"),
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true /* checkable */);
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menuEvent->Append(Event_Dynamic, _T("&Dynamic event\tCtrl-D"),
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_T("Dynamic event sample - only works after Connect"));
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menuEvent->AppendSeparator();
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menuEvent->Append(Event_Push, _T("&Push event handler\tCtrl-P"),
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_T("Push event handler for test event"));
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menuEvent->Append(Event_Pop, _T("P&op event handler\tCtrl-O"),
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_T("Pop event handler for test event"));
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menuEvent->Append(Event_Test, _T("Test event\tCtrl-T"),
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_T("Test event processed by pushed event handler"));
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menuEvent->AppendSeparator();
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menuEvent->Append(Event_Custom, _T("Fire c&ustom event\tCtrl-U"),
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_T("Generate a custom event"));
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// now append the freshly created menu to the menu bar...
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wxMenuBar *menuBar = new wxMenuBar();
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menuBar->Append(menuFile, _T("&File"));
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menuBar->Append(menuEvent, _T("&Event"));
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// ... and attach this menu bar to the frame
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SetMenuBar(menuBar);
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#if wxUSE_STATUSBAR
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CreateStatusBar(3);
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SetStatusText(_T("Welcome to wxWidgets event sample"));
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SetStatusText(_T("Dynamic: off"), Status_Dynamic);
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SetStatusText(_T("Push count: 0"), Status_Push);
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#endif // wxUSE_STATUSBAR
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}
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MyFrame::~MyFrame()
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{
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// we must pop any remaining event handlers to avoid memory leaks and
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// crashes!
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while ( m_nPush-- != 0 )
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{
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PopEventHandler(true /* delete handler */);
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}
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}
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// ----------------------------------------------------------------------------
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// standard event handlers
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// ----------------------------------------------------------------------------
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void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
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{
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// true is to force the frame to close
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Close(true);
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}
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void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
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{
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wxMessageBox( wxT("Event sample shows different ways of using events\n")
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wxT("<EFBFBD> 2001 Vadim Zeitlin"),
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wxT("About Event Sample"), wxOK | wxICON_INFORMATION, this );
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2001-01-31 11:00:00 -05:00
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}
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// ----------------------------------------------------------------------------
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// dynamic event handling stuff
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// ----------------------------------------------------------------------------
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void MyFrame::OnDynamic(wxCommandEvent& WXUNUSED(event))
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{
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2002-03-27 13:45:20 -05:00
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wxMessageBox
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(
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wxT("This is a dynamic event handler which can be connected ")
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wxT("and disconnected at run-time."),
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wxT("Dynamic Event Handler"), wxOK | wxICON_INFORMATION, this
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);
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2001-01-31 11:00:00 -05:00
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}
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void MyFrame::OnConnect(wxCommandEvent& event)
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{
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if ( event.IsChecked() )
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{
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// disconnect
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2004-05-28 06:43:39 -04:00
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Connect(Event_Dynamic, wxID_ANY, wxEVT_COMMAND_MENU_SELECTED,
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2001-01-31 11:00:00 -05:00
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(wxObjectEventFunction)
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(wxEventFunction)
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(wxCommandEventFunction)&MyFrame::OnDynamic);
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SetStatusText(_T("You can now use \"Dynamic\" item in the menu"));
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SetStatusText(_T("Dynamic: on"), Status_Dynamic);
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}
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else // connect
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{
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2004-05-28 06:43:39 -04:00
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Disconnect(Event_Dynamic, wxID_ANY, wxEVT_COMMAND_MENU_SELECTED);
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2001-01-31 11:00:00 -05:00
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SetStatusText(_T("You can no more use \"Dynamic\" item in the menu"));
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SetStatusText(_T("Dynamic: off"), Status_Dynamic);
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}
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}
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// ----------------------------------------------------------------------------
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// push/pop event handlers support
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// ----------------------------------------------------------------------------
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void MyFrame::OnPushEventHandler(wxCommandEvent& WXUNUSED(event))
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{
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PushEventHandler(new MyEvtHandler(++m_nPush));
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SetStatusText(wxString::Format(_T("Push count: %u"), m_nPush), Status_Push);
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}
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void MyFrame::OnPopEventHandler(wxCommandEvent& WXUNUSED(event))
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{
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wxCHECK_RET( m_nPush, _T("this command should be disabled!") );
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2004-05-28 06:43:39 -04:00
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PopEventHandler(true /* delete handler */);
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2001-01-31 11:00:00 -05:00
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m_nPush--;
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SetStatusText(wxString::Format(_T("Push count: %u"), m_nPush), Status_Push);
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}
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|
2003-09-09 16:24:34 -04:00
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void MyFrame::OnTest(wxCommandEvent& WXUNUSED(event))
|
2001-01-31 11:00:00 -05:00
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{
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wxLogMessage(_T("This is the test event handler in the main frame"));
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}
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void MyFrame::OnUpdateUIPop(wxUpdateUIEvent& event)
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{
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event.Enable( m_nPush > 0 );
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}
|
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|
2001-12-14 18:38:33 -05:00
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// ----------------------------------------------------------------------------
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|
// custom event methods
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|
// ----------------------------------------------------------------------------
|
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|
2003-09-09 16:24:34 -04:00
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void MyFrame::OnFireCustom(wxCommandEvent& WXUNUSED(event))
|
2001-12-14 18:38:33 -05:00
|
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|
{
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|
wxCommandEvent eventCustom(wxEVT_MY_CUSTOM_COMMAND);
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wxPostEvent(this, eventCustom);
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}
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|
2003-09-09 16:24:34 -04:00
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void MyFrame::OnProcessCustom(wxCommandEvent& WXUNUSED(event))
|
2001-12-14 18:38:33 -05:00
|
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|
{
|
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|
wxLogMessage(_T("Got a custom event!"));
|
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|
|
}
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