added write_append mode to wxFile, implemented eof() for Unix

[wxWidgets.git] / src / common / event.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        event.cpp
// Purpose:     Event classes
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart and Markus Holzem
// Licence:   	wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifdef __GNUG__
#pragma implementation "event.h"
#endif

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

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/defs.h"
#include "wx/control.h"
#include "wx/utils.h"
#include "wx/app.h"
#include "wx/dc.h"
#endif

#include "wx/event.h"
#include "wx/validate.h"

#if !USE_SHARED_LIBRARY
IMPLEMENT_DYNAMIC_CLASS(wxEvtHandler, wxObject)
IMPLEMENT_ABSTRACT_CLASS(wxEvent, wxObject)
IMPLEMENT_DYNAMIC_CLASS(wxCommandEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxScrollEvent, wxCommandEvent)
IMPLEMENT_DYNAMIC_CLASS(wxMouseEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxKeyEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxSizeEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxPaintEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxEraseEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxMoveEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxFocusEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxCloseEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxShowEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxMaximizeEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxIconizeEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxMenuEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxJoystickEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxDropFilesEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxActivateEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxInitDialogEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxSysColourChangedEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxIdleEvent, wxEvent)
IMPLEMENT_DYNAMIC_CLASS(wxUpdateUIEvent, wxEvent)

const wxEventTable *wxEvtHandler::GetEventTable() const { return &wxEvtHandler::sm_eventTable; }

const wxEventTable wxEvtHandler::sm_eventTable =
	{ NULL, &wxEvtHandler::sm_eventTableEntries[0] };

const wxEventTableEntry wxEvtHandler::sm_eventTableEntries[] = { { 0, 0, 0, NULL } };

#endif

/*
 * General wxWindows events, covering
 * all interesting things that might happen (button clicking, resizing,
 * setting text in widgets, etc.).
 *
 * For each completely new event type, derive a new event class.
 *
 */

wxEvent::wxEvent(int theId)
{
  m_eventType = 0;
  m_eventObject = NULL;
  m_eventHandle = NULL;
  m_timeStamp = 0;
  m_id = theId;
  m_skipped = FALSE;
  m_callbackUserData = NULL;
}

/*
 * Command events
 *
 */

wxCommandEvent::wxCommandEvent(WXTYPE commandType, int theId)
{
  m_eventType = commandType;
  m_clientData = NULL;
  m_extraLong = 0;
  m_commandInt = 0;
  m_id = theId;
  m_commandString = NULL;
}

/*
 * Scroll events
 */

wxScrollEvent::wxScrollEvent(WXTYPE commandType, int id, int pos, int orient):
  wxCommandEvent(commandType, id)
{
  m_extraLong = orient;
  m_commandInt = pos;
}


/*
 * Mouse events
 *
 */

wxMouseEvent::wxMouseEvent(WXTYPE commandType)
{
  m_eventType = commandType;
  m_metaDown = FALSE;
  m_altDown = FALSE;
  m_controlDown = FALSE;
  m_shiftDown = FALSE;
}

// True if was a button dclick event (1 = left, 2 = middle, 3 = right)
// or any button dclick event (but = -1)
bool wxMouseEvent::ButtonDClick(int but) const
{
  switch (but) {
    case -1:
      return (LeftDClick() || MiddleDClick() || RightDClick());
    case 1:
      return LeftDClick();
    case 2:
      return MiddleDClick();
    case 3:
      return RightDClick();
    default:
      return FALSE;
  }
  // NOTREACHED
}

// True if was a button down event (1 = left, 2 = middle, 3 = right)
// or any button down event (but = -1)
bool wxMouseEvent::ButtonDown(int but) const
{
  switch (but) {
    case -1:
      return (LeftDown() || MiddleDown() || RightDown());
    case 1:
      return LeftDown();
    case 2:
      return MiddleDown();
    case 3:
      return RightDown();
    default:
      return FALSE;
  }
  // NOTREACHED
}

// True if was a button up event (1 = left, 2 = middle, 3 = right)
// or any button up event (but = -1)
bool wxMouseEvent::ButtonUp(int but) const
{
  switch (but) {
    case -1:
      return (LeftUp() || MiddleUp() || RightUp());
    case 1:
      return LeftUp();
    case 2:
      return MiddleUp();
    case 3:
      return RightUp();
    default:
      return FALSE;
  }
  // NOTREACHED
}

// True if the given button is currently changing state
bool wxMouseEvent::Button(int but) const
{
  switch (but) {
    case -1:
      return (ButtonUp(-1) || ButtonDown(-1) || ButtonDClick(-1)) ;
    case 1:
      return (LeftDown() || LeftUp() || LeftDClick());
    case 2:
      return (MiddleDown() || MiddleUp() || MiddleDClick());
    case 3:
      return (RightDown() || RightUp() || RightDClick());
    default:
      return FALSE;
  }
  // NOTREACHED
}

bool wxMouseEvent::ButtonIsDown(int but) const
{
  switch (but) {
    case -1:
      return (LeftIsDown() || MiddleIsDown() || RightIsDown());
    case 1:
      return LeftIsDown();
    case 2:
      return MiddleIsDown();
    case 3:
      return RightIsDown();
    default:
      return FALSE;
  }
  // NOTREACHED
}

// Find the logical position of the event given the DC
wxPoint wxMouseEvent::GetLogicalPosition(const wxDC& dc) const
{
	wxPoint pt(dc.DeviceToLogicalX(m_x), dc.DeviceToLogicalY(m_y));
	return pt;
}


/*
 * Keyboard events
 *
 */

wxKeyEvent::wxKeyEvent(WXTYPE type)
{
  m_eventType = type;
  m_shiftDown = FALSE;
  m_controlDown = FALSE;
  m_metaDown = FALSE;
  m_altDown = FALSE;
  m_keyCode = 0;
}

/*
 * Event handler
 */

wxEvtHandler::wxEvtHandler(void)
{
  m_clientData = NULL;
  m_nextHandler = NULL;
  m_previousHandler = NULL;
  m_enabled = TRUE;
  m_dynamicEvents = NULL;
}

wxEvtHandler::~wxEvtHandler(void)
{
  // Takes itself out of the list of handlers
  if (m_previousHandler)
    m_previousHandler->m_nextHandler = m_nextHandler;

  if (m_nextHandler)
    m_nextHandler->m_previousHandler = m_previousHandler;
    
  if (m_dynamicEvents)
  {
    wxNode *node = m_dynamicEvents->First();
    while (node)
    {
      wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
      delete entry;
      node = node->Next();
    }
    delete m_dynamicEvents;
  };
}

/*
 * Event table stuff
 */

bool wxEvtHandler::ProcessEvent(wxEvent& event)
{
  // An event handler can be enabled or disabled
  if ( GetEvtHandlerEnabled() )
  {
    // Handle per-instance dynamic event tables first
  
    if (SearchDynamicEventTable( event )) return TRUE;

    // Then static per-class event tables  
  
    const wxEventTable *table = GetEventTable();

    // Try the associated validator first, if this is a window.
    // Problem: if the event handler of the window has been replaced,
    // this wxEvtHandler may no longer be a window.
    // Therefore validators won't be processed if the handler
    // has been replaced with SetEventHandler.
    // THIS CAN BE CURED if PushEventHandler is used instead of
    // SetEventHandler, and then processing will be passed down the
    // chain of event handlers.
    if (IsKindOf(CLASSINFO(wxWindow)))
    {
  	  wxWindow *win = (wxWindow *)this;

	  // Can only use the validator of the window which
	  // is receiving the event
	  if ( (win == event.GetEventObject()) &&
	      win->GetValidator() &&
		  win->GetValidator()->ProcessEvent(event))
        	return TRUE;
    }

    // Search upwards through the inheritance hierarchy
    while (table)
    {
      if (SearchEventTable((wxEventTable&)*table, event))
          return TRUE;
      table = table->baseTable;
    }
  }

  // Try going down the event handler chain
  if ( GetNextHandler() )
  {
	    if ( GetNextHandler()->ProcessEvent(event) )
			return TRUE;
  }

  // Carry on up the parent-child hierarchy,
  // but only if event is a command event: it wouldn't
  // make sense for a parent to receive a child's size event, for example
  if (IsKindOf(CLASSINFO(wxWindow)) && event.IsKindOf(CLASSINFO(wxCommandEvent)))
  {
    wxWindow *win = (wxWindow *)this;
	wxWindow *parent = win->GetParent();
    if (parent && !parent->IsBeingDeleted())
      return win->GetParent()->GetEventHandler()->ProcessEvent(event);
  }

  // Last try - application object
  if (wxTheApp && this != wxTheApp && wxTheApp->ProcessEvent(event))
    return TRUE;
  else
    return FALSE;
}

bool wxEvtHandler::SearchEventTable(wxEventTable& table, wxEvent& event)
{
  int i = 0;
  int commandId = event.GetId();
  
  while (table.entries[i].m_fn != NULL)
  {
    if ((event.GetEventType() == table.entries[i].m_eventType) &&
        (table.entries[i].m_id == -1 || // Match, if event spec says any id will do (id == -1)
          (table.entries[i].m_lastId == -1 && commandId == table.entries[i].m_id) ||
          (table.entries[i].m_lastId != -1 &&
            (commandId >= table.entries[i].m_id && commandId <= table.entries[i].m_lastId))))
    {
	  	event.Skip(FALSE);
                event.m_callbackUserData = table.entries[i].m_callbackUserData;
	
        (this->*((wxEventFunction) (table.entries[i].m_fn)))(event);

		if ( event.GetSkipped() )
			return FALSE;
		  else
            return TRUE;
    }
    i ++;
  }
  return FALSE;
}

void wxEvtHandler::Connect( const int id, const int lastId,
                            const int eventType, 
		            wxObjectEventFunction func,
		            wxObject *userData )
{
  wxEventTableEntry *entry = new wxEventTableEntry;
  entry->m_id = id;
  entry->m_lastId = lastId;
  entry->m_eventType = eventType;
  entry->m_fn = func;
  entry->m_callbackUserData = userData;
  
  if (!m_dynamicEvents) 
    m_dynamicEvents = new wxList;
    
  m_dynamicEvents->Append( (wxObject*) entry );
}

bool wxEvtHandler::SearchDynamicEventTable( wxEvent& event )
{
  if (!m_dynamicEvents) return FALSE;
  
  int commandId = event.GetId();
  
  wxNode *node = m_dynamicEvents->First();
  while (node)
  {
    wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();
    if (entry->m_fn)
    {
    if ((event.GetEventType() == entry->m_eventType) &&
        (entry->m_id == -1 ||     // Match, if event spec says any id will do (id == -1)
        (entry->m_lastId == -1 && commandId == entry->m_id) ||
        (entry->m_lastId != -1 &&
        (commandId >= entry->m_id && commandId <= entry->m_lastId))))
       {
	  event.Skip(FALSE);
          event.m_callbackUserData = entry->m_callbackUserData;
	
          (this->*((wxEventFunction) (entry->m_fn)))(event);

	  if (event.GetSkipped()) 
	    return FALSE;
	  else
            return TRUE;
       }
    };
    node = node->Next();
  }
  return FALSE;
};

#if WXWIN_COMPATIBILITY
void wxEvtHandler::OldOnMenuCommand(int cmd)
{
    if (GetNextHandler()) GetNextHandler()->OldOnMenuCommand(cmd);
}

void wxEvtHandler::OldOnMenuSelect(int cmd)
{
    if (GetNextHandler()) GetNextHandler()->OldOnMenuSelect(cmd);
}

void wxEvtHandler::OldOnInitMenuPopup(int pos)
{
    if (GetNextHandler()) GetNextHandler()->OldOnInitMenuPopup(pos);
}

void wxEvtHandler::OldOnScroll(wxCommandEvent& event)
{
    if (GetNextHandler()) GetNextHandler()->OldOnScroll(event);
}

void wxEvtHandler::OldOnPaint(void)
{
    if (GetNextHandler()) GetNextHandler()->OldOnPaint();
}
void wxEvtHandler::OldOnSize(int width, int height)
{
    if (GetNextHandler()) GetNextHandler()->OldOnSize(width, height);
}

void wxEvtHandler::OldOnMove(int x, int y)
{
    if (GetNextHandler()) GetNextHandler()->OldOnMove(x, y);
}

void wxEvtHandler::OldOnMouseEvent(wxMouseEvent& event)
{
    if (GetNextHandler()) GetNextHandler()->OldOnMouseEvent(event);
}

void wxEvtHandler::OldOnChar(wxKeyEvent& event)
{
    if (GetNextHandler()) GetNextHandler()->OldOnChar(event);
}

// Under Windows, we can intercept character input per dialog or frame
bool wxEvtHandler::OldOnCharHook(wxKeyEvent& event)
{
    if (GetNextHandler()) return GetNextHandler()->OldOnCharHook(event);
 	else return FALSE;
}

void wxEvtHandler::OldOnActivate(bool active)
{
    if (GetNextHandler()) GetNextHandler()->OldOnActivate(active);
}

void wxEvtHandler::OldOnSetFocus(void)
{
    if (GetNextHandler()) GetNextHandler()->OldOnSetFocus();
}

void wxEvtHandler::OldOnKillFocus(void)
{
    if (GetNextHandler()) GetNextHandler()->OldOnKillFocus();
}

bool wxEvtHandler::OldOnSysColourChange(void)
{
    if (GetNextHandler()) return GetNextHandler()->OldOnSysColourChange();
    return FALSE;
}

void wxEvtHandler::OldOnDropFiles(int n, char *files[], int x, int y)
{
    if (GetNextHandler()) GetNextHandler()->OldOnDropFiles(n, files, x, y);
}
#endif

bool wxEvtHandler::OnClose(void)
{
    if (GetNextHandler()) return GetNextHandler()->OnClose();
    else return FALSE;
}