7c9cc312e7
Update the event sample to define (as) many (as possible) event handlers for a test button and log messages in all of the handlers to leave a trace of the order in which they were executed. Add a pointer to this feature of the event sample to the events overview. Closes #11156. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
617 lines
20 KiB
C++
617 lines
20 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: event.cpp
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// Purpose: wxWidgets sample demonstrating different event usage
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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) 2001-2009 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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// 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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// need because it includes almost all "standard" wxWidgets headers)
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#ifndef WX_PRECOMP
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#include "wx/wx.h"
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#endif
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#ifndef __WXMSW__
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#include "../sample.xpm"
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#endif
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#include <wx/statline.h>
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#include <wx/log.h>
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// ----------------------------------------------------------------------------
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// event constants
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// ----------------------------------------------------------------------------
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// define a custom event type (we don't need a separate declaration here but
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// usually you would use a matching wxDECLARE_EVENT in a header)
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wxDEFINE_EVENT(wxEVT_MY_CUSTOM_COMMAND, wxCommandEvent);
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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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wxCommandEventHandler(fn), \
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(wxObject *) NULL \
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),
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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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// these are regular event handlers used to highlight the events handling
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// order
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void OnClickDynamicHandlerApp(wxCommandEvent& event);
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void OnClickStaticHandlerApp(wxCommandEvent& event);
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// we override wxConsoleApp::FilterEvent used to highlight the events
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// handling order
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virtual int FilterEvent(wxEvent& event);
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private:
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DECLARE_EVENT_TABLE()
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};
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// Define a custom button used to highlight the events handling order
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class MyEvtTestButton : public wxButton
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{
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public:
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static long BUTTON_ID;
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MyEvtTestButton(wxWindow *parent, const wxString& label)
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: wxButton(parent, BUTTON_ID, label)
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{
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// Add a dynamic handler for this button event to button itself
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Connect(wxEVT_COMMAND_BUTTON_CLICKED,
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wxCommandEventHandler(MyEvtTestButton::OnClickDynamicHandler));
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}
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private:
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void OnClickDynamicHandler(wxCommandEvent& event)
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{
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wxLogMessage("Step 3 in \"How Events are Processed\":\n"
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"Button::ownDynamicHandler");
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event.Skip();
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}
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void OnClickStaticHandler(wxCommandEvent& event)
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{
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wxLogMessage("Step 4 in \"How Events are Processed\":\n"
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"Button::ownStaticHandler");
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event.Skip();
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}
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DECLARE_EVENT_TABLE()
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};
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long MyEvtTestButton::BUTTON_ID = wxNewId();
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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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#ifdef wxHAS_EVENT_BIND
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void OnBind(wxCommandEvent& event);
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#endif // wxHAS_EVENT_BIND
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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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void OnFireCustom(wxCommandEvent& event);
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void OnProcessCustom(wxCommandEvent& event);
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void OnUpdateUIPop(wxUpdateUIEvent& event);
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// regular event handlers used to highlight the events handling order
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void OnClickDynamicHandlerFrame(wxCommandEvent& event);
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void OnClickDynamicHandlerButton(wxCommandEvent& event);
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void OnClickStaticHandlerFrame(wxCommandEvent& event);
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private:
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// symbolic names for the 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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void UpdateDynamicStatus(bool on)
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{
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#if wxUSE_STATUSBAR
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if ( on )
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{
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SetStatusText("You can now use \"Dynamic\" item in the menu");
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SetStatusText("Dynamic: on", Status_Dynamic);
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}
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else
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{
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SetStatusText("You can no more use \"Dynamic\" item in the menu");
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SetStatusText("Dynamic: off", Status_Dynamic);
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}
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#endif // wxUSE_STATUSBAR
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}
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// number of pushed event handlers
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unsigned m_nPush;
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// the button to whose event we connect dynamically
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wxButton *m_btnDynamic;
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// the button used to highlight the event handlers execution order
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MyEvtTestButton *m_testBtn;
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// any class wishing to process wxWidgets events must use this macro
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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(wxT("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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unsigned 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_Bind,
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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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// ----------------------------------------------------------------------------
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// event tables and other macros for wxWidgets
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// ----------------------------------------------------------------------------
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// The event tables connect the wxWidgets events with the functions (event
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// handlers) which process them.
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BEGIN_EVENT_TABLE(MyApp, wxApp)
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// Add a static handler for button Click event in the app
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EVT_BUTTON(MyEvtTestButton::BUTTON_ID, MyApp::OnClickStaticHandlerApp)
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END_EVENT_TABLE()
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BEGIN_EVENT_TABLE(MyEvtTestButton, wxButton)
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// Add a static handler to this button itself for its own event
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EVT_BUTTON(BUTTON_ID, MyEvtTestButton::OnClickStaticHandler)
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END_EVENT_TABLE()
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// This 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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#ifdef wxHAS_EVENT_BIND
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EVT_MENU(Event_Bind, MyFrame::OnBind)
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#endif // wxHAS_EVENT_BIND
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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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EVT_MY_CUSTOM_COMMAND(wxID_ANY, MyFrame::OnProcessCustom)
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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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// Add a static handler in the parent frame for button event
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EVT_BUTTON(MyEvtTestButton::BUTTON_ID, MyFrame::OnClickStaticHandlerFrame)
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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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if ( !wxApp::OnInit() )
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return false;
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// create the main application window
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MyFrame *frame = new MyFrame(wxT("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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// Add a dynamic handler at the application level for the test button
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Connect(MyEvtTestButton::BUTTON_ID, wxEVT_COMMAND_BUTTON_CLICKED,
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wxCommandEventHandler(MyApp::OnClickDynamicHandlerApp));
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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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// This is always the first to handle an event !
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int MyApp::FilterEvent(wxEvent& event)
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{
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if ( event.GetEventType() == wxEVT_COMMAND_BUTTON_CLICKED &&
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event.GetId() == MyEvtTestButton::BUTTON_ID )
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{
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wxLogMessage("Step 0 in \"How Events are Processed\":\n"
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"App::FilterEvent");
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}
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return wxApp::FilterEvent(event);
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}
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void MyApp::OnClickDynamicHandlerApp(wxCommandEvent& event)
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{
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wxLogMessage("Step 7, 3 in \"How Events are Processed\":\n"
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"App::DynamicHandler_InAppTable");
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event.Skip();
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}
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void MyApp::OnClickStaticHandlerApp(wxCommandEvent& event)
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{
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wxLogMessage("Step 7, 4 in \"How Events are Processed\":\n"
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"App::StaticHandler_InAppTable");
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wxLogMessage("Button click processed, there should be no more messages "
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"about handling events from the button.\n\n"
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"The log below shows the order in which the handlers "
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"were executed.");
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wxLog::FlushActive();
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event.Skip();
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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(NULL, wxID_ANY, title, pos, size)
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{
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SetIcon(wxICON(sample));
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// init members
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m_nPush = 0;
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m_btnDynamic = NULL;
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// create a menu bar
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wxMenu *menuFile = new wxMenu;
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menuFile->Append(Event_About, wxT("&About...\tCtrl-A"), wxT("Show about dialog"));
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menuFile->AppendSeparator();
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menuFile->Append(Event_Quit, wxT("E&xit\tAlt-X"), wxT("Quit this program"));
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wxMenu *menuEvent = new wxMenu;
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#ifdef wxHAS_EVENT_BIND
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menuEvent->AppendCheckItem(Event_Bind, "&Bind\tCtrl-B",
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"Bind or unbind a dynamic event handler");
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#endif // wxHAS_EVENT_BIND
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menuEvent->AppendCheckItem(Event_Connect, wxT("&Connect\tCtrl-C"),
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wxT("Connect or disconnect the dynamic event handler"));
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menuEvent->Append(Event_Dynamic, wxT("&Dynamic event\tCtrl-D"),
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wxT("Dynamic event sample - only works after Connect"));
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menuEvent->AppendSeparator();
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menuEvent->Append(Event_Push, wxT("&Push event handler\tCtrl-P"),
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wxT("Push event handler for test event"));
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menuEvent->Append(Event_Pop, wxT("P&op event handler\tCtrl-O"),
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wxT("Pop event handler for test event"));
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menuEvent->Append(Event_Test, wxT("Test event\tCtrl-T"),
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wxT("Test event processed by pushed event handler"));
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menuEvent->AppendSeparator();
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menuEvent->Append(Event_Custom, wxT("Fire c&ustom event\tCtrl-U"),
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wxT("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, wxT("&File"));
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menuBar->Append(menuEvent, wxT("&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(wxT("Welcome to wxWidgets event sample"));
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SetStatusText(wxT("Dynamic: off"), Status_Dynamic);
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SetStatusText(wxT("Push count: 0"), Status_Push);
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#endif // wxUSE_STATUSBAR
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wxPanel * const panel = new wxPanel(this);
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wxSizer * const mainSizer = new wxBoxSizer(wxVERTICAL);
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wxSizer * const sizer = new wxBoxSizer(wxHORIZONTAL);
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const wxSizerFlags centreY(wxSizerFlags().Centre().Border());
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sizer->Add(new wxStaticText(panel, wxID_ANY,
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"This button will only work if its handler is dynamically connected"),
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centreY);
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m_btnDynamic = new wxButton(panel, Event_Dynamic, "&Dynamic button");
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sizer->Add(m_btnDynamic, centreY);
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mainSizer->Add(sizer, 1, wxEXPAND);
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mainSizer->Add(new wxStaticLine(panel), 0, wxEXPAND);
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mainSizer->Add(new wxStaticLine(panel), 0, wxEXPAND);
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m_testBtn = new MyEvtTestButton(panel, "Test Event Handlers Execution Order");
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// After being created, an instance of MyEvtTestButton already has its own
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// event handlers (see class definition);
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// Add a dynamic handler for this button event in the parent frame
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Connect(m_testBtn->GetId(), wxEVT_COMMAND_BUTTON_CLICKED,
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wxCommandEventHandler(MyFrame::OnClickDynamicHandlerFrame));
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// Bind a method of this frame (notice "this" argument!) to the button
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// itself
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m_testBtn->Connect(wxEVT_COMMAND_BUTTON_CLICKED,
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wxCommandEventHandler(MyFrame::OnClickDynamicHandlerButton),
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NULL,
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this);
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mainSizer->Add(m_testBtn);
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panel->SetSizer(mainSizer);
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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("Event sample shows different ways of using events\n"
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"(c) 2001-2009 Vadim Zeitlin",
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"About wxWidgets Event Sample",
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wxOK | wxICON_INFORMATION, this);
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}
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void MyFrame::OnClickStaticHandlerFrame(wxCommandEvent& event)
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{
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wxLogMessage("Step 6, 4 in \"How Events are Processed\":\n"
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"parentWin::StaticHandler_InFrameTable");
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event.Skip();
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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::OnClickDynamicHandlerFrame(wxCommandEvent& event)
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{
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wxLogMessage("Step 6, 3 in \"How Events are Processed\":\n"
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"parentWin::DynamicHandler_InFrameTable");
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event.Skip();
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}
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void MyFrame::OnClickDynamicHandlerButton(wxCommandEvent& event)
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{
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wxLogMessage("Step 3 in \"How Events are Processed\":\n"
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"parentWin::DynamicHandler_InButtonTable");
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event.Skip();
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}
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void MyFrame::OnDynamic(wxCommandEvent& event)
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{
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wxString origin;
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if ( event.GetEventObject() == this )
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origin = "menu item";
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else if ( event.GetEventObject() == m_btnDynamic )
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origin = "button";
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else
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origin = "unknown event source";
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wxMessageBox
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(
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"This message box is shown from the dynamically connected "
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"event handler in response to event generated by " + origin,
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"wxWidgets Event Sample", wxOK | wxICON_INFORMATION, this
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);
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}
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#ifdef wxHAS_EVENT_BIND
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void MyFrame::OnBind(wxCommandEvent& event)
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{
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if ( event.IsChecked() )
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{
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// as we bind directly to the button, there is no need to use an id
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// here: the button will only ever get its own events
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m_btnDynamic->Bind(wxEVT_COMMAND_BUTTON_CLICKED, &MyFrame::OnDynamic,
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this);
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// but we do need the id for the menu command as the frame gets all of
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// them
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Bind(wxEVT_COMMAND_MENU_SELECTED, &MyFrame::OnDynamic, this,
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Event_Dynamic);
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}
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else // disconnect
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{
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m_btnDynamic->Unbind(wxEVT_COMMAND_BUTTON_CLICKED,
|
|
&MyFrame::OnDynamic, this);
|
|
Unbind(wxEVT_COMMAND_MENU_SELECTED, &MyFrame::OnDynamic, this,
|
|
Event_Dynamic);
|
|
}
|
|
|
|
UpdateDynamicStatus(event.IsChecked());
|
|
}
|
|
|
|
#endif // wxHAS_EVENT_BIND
|
|
|
|
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());
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// push/pop event handlers support
|
|
// ----------------------------------------------------------------------------
|
|
|
|
void MyFrame::OnPushEventHandler(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
PushEventHandler(new MyEvtHandler(++m_nPush));
|
|
|
|
#if wxUSE_STATUSBAR
|
|
SetStatusText(wxString::Format(wxT("Push count: %u"), m_nPush), Status_Push);
|
|
#endif // wxUSE_STATUSBAR
|
|
}
|
|
|
|
void MyFrame::OnPopEventHandler(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
wxCHECK_RET( m_nPush, wxT("this command should be disabled!") );
|
|
|
|
PopEventHandler(true /* delete handler */);
|
|
m_nPush--;
|
|
|
|
#if wxUSE_STATUSBAR
|
|
SetStatusText(wxString::Format(wxT("Push count: %u"), m_nPush), Status_Push);
|
|
#endif // wxUSE_STATUSBAR
|
|
}
|
|
|
|
void MyFrame::OnTest(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
wxLogMessage(wxT("This is the test event handler in the main frame"));
|
|
}
|
|
|
|
void MyFrame::OnUpdateUIPop(wxUpdateUIEvent& event)
|
|
{
|
|
event.Enable( m_nPush > 0 );
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// custom event methods
|
|
// ----------------------------------------------------------------------------
|
|
|
|
void MyFrame::OnFireCustom(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
wxCommandEvent eventCustom(wxEVT_MY_CUSTOM_COMMAND);
|
|
|
|
wxPostEvent(this, eventCustom);
|
|
}
|
|
|
|
void MyFrame::OnProcessCustom(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
wxLogMessage(wxT("Got a custom event!"));
|
|
}
|
|
|