wxWidgets/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(wxNotifyEvent, wxCommandEvent)
    IMPLEMENT_DYNAMIC_CLASS(wxScrollEvent, wxCommandEvent)
    IMPLEMENT_DYNAMIC_CLASS(wxScrollWinEvent, wxEvent)
    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, wxCommandEvent)
    IMPLEMENT_DYNAMIC_CLASS(wxNavigationKeyEvent, wxCommandEvent)
    IMPLEMENT_DYNAMIC_CLASS(wxPaletteChangedEvent, wxEvent)
    IMPLEMENT_DYNAMIC_CLASS(wxQueryNewPaletteEvent, wxEvent)

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

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

    const wxEventTableEntry wxEvtHandler::sm_eventTableEntries[] =
        { { 0, 0, 0, (wxObjectEventFunction) NULL, (wxObject*) NULL } };

#endif // !USE_SHARED_LIBRARY

#if wxUSE_THREADS
/* To put pending event handlers */
extern wxList *wxPendingEvents;
extern wxCriticalSection *wxPendingEventsLocker;
#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 = wxEVT_NULL;
    m_eventObject = (wxObject *) NULL;
    m_eventHandle = (char *) NULL;
    m_timeStamp = 0;
    m_id = theId;
    m_skipped = FALSE;
    m_callbackUserData = (wxObject *) NULL;
    m_isCommandEvent = FALSE;
}

void wxEvent::CopyObject(wxObject& object_dest) const
{
    wxEvent *obj = (wxEvent *)&object_dest; 
    wxObject::CopyObject(object_dest);

    obj->m_eventType = m_eventType;
    obj->m_eventObject = m_eventObject;
    obj->m_eventHandle = m_eventHandle;
    obj->m_timeStamp = m_timeStamp;
    obj->m_id = m_id;
    obj->m_skipped = m_skipped;
    obj->m_callbackUserData = m_callbackUserData;
    obj->m_isCommandEvent = m_isCommandEvent;
}

/*
 * Command events
 *
 */

wxCommandEvent::wxCommandEvent(wxEventType commandType, int theId)
{
    m_eventType = commandType;
    m_clientData = (char *) NULL;
    m_clientObject = (wxClientData *) NULL;
    m_extraLong = 0;
    m_commandInt = 0;
    m_id = theId;
    m_commandString = (wxChar *) NULL;
    m_isCommandEvent = TRUE;
}

void wxCommandEvent::CopyObject(wxObject& obj_d) const
{
    wxCommandEvent *obj = (wxCommandEvent *)&obj_d; 

    wxEvent::CopyObject(obj_d);

    obj->m_clientData   = m_clientData;
    obj->m_clientObject = m_clientObject;
    obj->m_extraLong    = m_extraLong;
    obj->m_commandInt   = m_commandInt;
}

/*
 * Scroll events
 */

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

/*
 * ScrollWin events
 */

wxScrollWinEvent::wxScrollWinEvent(wxEventType commandType,
                                   int pos,
                                   int orient)
             : wxEvent(commandType)
{
    m_extraLong = orient;
    m_commandInt = pos;
}

/*
 * Mouse events
 *
 */

wxMouseEvent::wxMouseEvent(wxEventType commandType)
{
    m_eventType = commandType;
    m_metaDown = FALSE;
    m_altDown = FALSE;
    m_controlDown = FALSE;
    m_shiftDown = FALSE;
    m_leftDown = FALSE;
    m_rightDown = FALSE;
    m_middleDown = FALSE;
    m_x = 0;
    m_y = 0;
}

void wxMouseEvent::CopyObject(wxObject& obj_d) const
{
    wxMouseEvent *obj = (wxMouseEvent *)&obj_d;

    wxEvent::CopyObject(obj_d);

    obj->m_metaDown = m_metaDown;
    obj->m_altDown = m_altDown;
    obj->m_controlDown = m_controlDown;
    obj->m_shiftDown = m_shiftDown;
    obj->m_leftDown = m_leftDown;
    obj->m_rightDown = m_rightDown;
    obj->m_middleDown = m_middleDown;
    obj->m_x = m_x;
    obj->m_y = m_y;
}

// 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:
            wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonDClick"));
    }

    return FALSE;
}

// 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:
            wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonDown"));
    }

    return FALSE;
}

// 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:
            wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonUp"));
    }

    return FALSE;
}

// 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:
            wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::Button"));
    }

    return FALSE;
}

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:
            wxFAIL_MSG(_T("invalid parameter in wxMouseEvent::ButtonIsDown"));
    }

    return FALSE;
}

// 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(wxEventType type)
{
    m_eventType = type;
    m_shiftDown = FALSE;
    m_controlDown = FALSE;
    m_metaDown = FALSE;
    m_altDown = FALSE;
    m_keyCode = 0;
    m_scanCode = 0;
}

void wxKeyEvent::CopyObject(wxObject& obj_d) const
{
    wxKeyEvent *obj = (wxKeyEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_shiftDown   = m_shiftDown;
    obj->m_controlDown = m_controlDown;
    obj->m_metaDown    = m_metaDown;
    obj->m_altDown     = m_altDown;
    obj->m_keyCode     = m_keyCode;
}


/*
 * Misc events
 */

void wxSizeEvent::CopyObject(wxObject& obj_d) const
{
    wxSizeEvent *obj = (wxSizeEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_size = m_size;
}

void wxMoveEvent::CopyObject(wxObject& obj_d) const
{
    wxMoveEvent *obj = (wxMoveEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_pos = m_pos;
}

void wxEraseEvent::CopyObject(wxObject& obj_d) const
{
    wxEraseEvent *obj = (wxEraseEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_dc = m_dc;
}

void wxActivateEvent::CopyObject(wxObject& obj_d) const
{
    wxActivateEvent *obj = (wxActivateEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_active = m_active;
}

void wxMenuEvent::CopyObject(wxObject& obj_d) const
{
    wxMenuEvent *obj = (wxMenuEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_menuId = m_menuId;
}

void wxCloseEvent::CopyObject(wxObject& obj_d) const
{
    wxCloseEvent *obj = (wxCloseEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_loggingOff = m_loggingOff;
    obj->m_veto = m_veto;
#if WXWIN_COMPATIBILITY
    obj->m_force = m_force;
#endif
    obj->m_canVeto = m_canVeto;
}
 
void wxShowEvent::CopyObject(wxObject& obj_d) const
{
    wxShowEvent *obj = (wxShowEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_show = m_show;
}

void wxJoystickEvent::CopyObject(wxObject& obj_d) const
{
    wxJoystickEvent *obj = (wxJoystickEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_pos = m_pos;
    obj->m_zPosition = m_zPosition;
    obj->m_buttonChange = m_buttonChange;
    obj->m_buttonState = m_buttonState;
    obj->m_joyStick = m_joyStick;
} 

void wxDropFilesEvent::CopyObject(wxObject& obj_d) const
{
    wxDropFilesEvent *obj = (wxDropFilesEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_noFiles = m_noFiles;
    obj->m_pos = m_pos;
    // TODO: Problem with obj->m_files. It should be deallocated by the
    // destructor of the event. 
}

void wxIdleEvent::CopyObject(wxObject& obj_d) const
{
    wxIdleEvent *obj = (wxIdleEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_requestMore = m_requestMore;
}

void wxUpdateUIEvent::CopyObject(wxObject &obj_d) const
{
    wxUpdateUIEvent *obj = (wxUpdateUIEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_checked = m_checked;
    obj->m_enabled = m_enabled;
    obj->m_text = m_text;
    obj->m_setText = m_setText;
    obj->m_setChecked = m_setChecked;
    obj->m_setEnabled = m_setEnabled;
}

void wxPaletteChangedEvent::CopyObject(wxObject &obj_d) const
{
    wxPaletteChangedEvent *obj = (wxPaletteChangedEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_changedWindow = m_changedWindow;
}

void wxQueryNewPaletteEvent::CopyObject(wxObject& obj_d) const
{
    wxQueryNewPaletteEvent *obj = (wxQueryNewPaletteEvent *)&obj_d;
    wxEvent::CopyObject(obj_d);

    obj->m_paletteRealized = m_paletteRealized;
}

/*
 * Event handler
 */

wxEvtHandler::wxEvtHandler()
{
    m_nextHandler = (wxEvtHandler *) NULL;
    m_previousHandler = (wxEvtHandler *) NULL;
    m_enabled = TRUE;
    m_dynamicEvents = (wxList *) NULL;
    m_isWindow = FALSE;
#if wxUSE_THREADS
    m_eventsLocker = new wxCriticalSection();
#endif
    m_pendingEvents = (wxList *) NULL;
}

wxEvtHandler::~wxEvtHandler()
{
    // 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();
            if (entry->m_callbackUserData) delete entry->m_callbackUserData;
            delete entry;
            node = node->Next();
        }
        delete m_dynamicEvents;
    };

#if wxUSE_THREADS
    if (m_pendingEvents)
      delete m_pendingEvents;

    delete m_eventsLocker;
#endif
}

#if wxUSE_THREADS

#ifdef __WXGTK__
extern bool g_isIdle;

extern void wxapp_install_idle_handler();
#endif

bool wxEvtHandler::ProcessThreadEvent(wxEvent& event)
{
    wxEvent *event_main;
    wxCriticalSectionLocker locker(*m_eventsLocker);

    // check that we are really in a child thread
    wxASSERT( !wxThread::IsMain() );

    if (m_pendingEvents == NULL)
      m_pendingEvents = new wxList();

    event_main = (wxEvent *)event.Clone();

    m_pendingEvents->Append(event_main);

    wxPendingEventsLocker->Enter();
    wxPendingEvents->Append(this);
    wxPendingEventsLocker->Leave();

#ifdef __WXGTK__
//    if (g_isIdle) wxapp_install_idle_handler();
#endif

    return TRUE;
}

void wxEvtHandler::ProcessPendingEvents()
{
    wxCriticalSectionLocker locker(*m_eventsLocker);
    wxNode *node = m_pendingEvents->First();
    wxEvent *event;

    while (node != NULL) {
      event = (wxEvent *)node->Data();
      ProcessEvent(*event);
      delete node;
      node = m_pendingEvents->First();
    }
}
#endif

/*
 * Event table stuff
 */

bool wxEvtHandler::ProcessEvent(wxEvent& event)
{
    // check that our flag corresponds to reality
    wxASSERT( m_isWindow == IsKindOf(CLASSINFO(wxWindow)) );

    // An event handler can be enabled or disabled
    if ( GetEvtHandlerEnabled() )
    {
#if wxUSE_THREADS
	// Check whether we are in a child thread.
        if (!wxThread::IsMain())
          return ProcessThreadEvent(event);
#endif
        // Handle per-instance dynamic event tables first

        if ( m_dynamicEvents && 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 ( m_isWindow )
        {
            wxWindow *win = (wxWindow *)this;

            // Can only use the validator of the window which
            // is receiving the event
            if ( win == event.GetEventObject() )
            {
                wxValidator *validator = win->GetValidator();
                if ( validator && validator->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 ( m_isWindow && event.IsCommandEvent() )
    {
        wxWindow *win = (wxWindow *)this;
        wxWindow *parent = win->GetParent();
        if (parent && !parent->IsBeingDeleted())
            return parent->GetEventHandler()->ProcessEvent(event);
    }

    // Last try - application object.
    if ( wxTheApp && (this != wxTheApp) )
    {
        // Special case: don't pass wxEVT_IDLE to wxApp, since it'll always
        // swallow it. wxEVT_IDLE is sent explicitly to wxApp so it will be
        // processed appropriately via SearchEventTable.
        if ( event.GetEventType() != wxEVT_IDLE )
        {
            if ( wxTheApp->ProcessEvent(event) )
                return TRUE;
        }
    }

    return FALSE;
}

bool wxEvtHandler::SearchEventTable(wxEventTable& table, wxEvent& event)
{
    int i = 0;
    int commandId = event.GetId();

    // BC++ doesn't like while (table.entries[i].m_fn)

#ifdef __SC__
    while (table.entries[i].m_fn != 0)
#else
    while (table.entries[i].m_fn != 0L)
#endif
    {
        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( int id, int lastId,
                            wxEventType 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 )
{
    wxCHECK_MSG( m_dynamicEvents, FALSE,
                 _T("caller should check that we have dynamic events") );

    int commandId = event.GetId();

    wxNode *node = m_dynamicEvents->First();
    while (node)
    {
        wxEventTableEntry *entry = (wxEventTableEntry*)node->Data();

        if (entry->m_fn)
        {
            // Match, if event spec says any id will do (id == -1)
            if ( (event.GetEventType() == entry->m_eventType) &&
                 (entry->m_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
bool wxEvtHandler::OnClose()
{
    if (GetNextHandler())
        return GetNextHandler()->OnClose();
    else
        return FALSE;
}
#endif // WXWIN_COMPATIBILITY

// Find a window with the focus, that is also a descendant of the given window.
// This is used to determine the window to initially send commands to.
wxWindow* wxFindFocusDescendant(wxWindow* ancestor)
{
    // Process events starting with the window with the focus, if any.
    wxWindow* focusWin = wxWindow::FindFocus();
    wxWindow* win = focusWin;

    // Check if this is a descendant of this frame.
    // If not, win will be set to NULL.
    while (win)
    {
        if (win == ancestor)
            break;
        else
            win = win->GetParent();
    }
    if (win == (wxWindow*) NULL)
        focusWin = (wxWindow*) NULL;

    return focusWin;
}