| 1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: mgl/evtloop.cpp |
| 3 | // Purpose: implements wxEventLoop for MGL |
| 4 | // Author: Vaclav Slavik |
| 5 | // RCS-ID: $Id$ |
| 6 | // Copyright: (c) 2001-2002 SciTech Software, Inc. (www.scitechsoft.com) |
| 7 | // License: wxWindows licence |
| 8 | /////////////////////////////////////////////////////////////////////////////// |
| 9 | |
| 10 | // ---------------------------------------------------------------------------- |
| 11 | // headers |
| 12 | // ---------------------------------------------------------------------------- |
| 13 | |
| 14 | #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) |
| 15 | #pragma implementation "evtloop.h" |
| 16 | #endif |
| 17 | |
| 18 | // For compilers that support precompilation, includes "wx.h". |
| 19 | #include "wx/wxprec.h" |
| 20 | |
| 21 | #ifdef __BORLANDC__ |
| 22 | #pragma hdrstop |
| 23 | #endif |
| 24 | |
| 25 | #ifndef WX_PRECOMP |
| 26 | #include "wx/window.h" |
| 27 | #include "wx/app.h" |
| 28 | #include "wx/thread.h" |
| 29 | #endif //WX_PRECOMP |
| 30 | |
| 31 | #include "wx/evtloop.h" |
| 32 | #include "wx/timer.h" |
| 33 | #include "wx/mgl/private.h" |
| 34 | |
| 35 | // ---------------------------------------------------------------------------- |
| 36 | // wxEventLoopImpl |
| 37 | // ---------------------------------------------------------------------------- |
| 38 | |
| 39 | class WXDLLEXPORT wxEventLoopImpl |
| 40 | { |
| 41 | public: |
| 42 | // ctor |
| 43 | wxEventLoopImpl() |
| 44 | { |
| 45 | SetExitCode(0); |
| 46 | SetKeepLooping(TRUE); |
| 47 | } |
| 48 | |
| 49 | // process an event |
| 50 | void Dispatch(); |
| 51 | |
| 52 | // generate an idle event, return TRUE if more idle time requested |
| 53 | bool SendIdleEvent(); |
| 54 | |
| 55 | // set/get the exit code |
| 56 | void SetExitCode(int exitcode) { m_exitcode = exitcode; } |
| 57 | int GetExitCode() const { return m_exitcode; } |
| 58 | |
| 59 | void SetKeepLooping(bool k) { m_keepLooping = k; } |
| 60 | bool GetKeepLooping() const { return m_keepLooping; } |
| 61 | |
| 62 | private: |
| 63 | |
| 64 | // the exit code of the event loop |
| 65 | int m_exitcode; |
| 66 | // FALSE if the loop should end |
| 67 | bool m_keepLooping; |
| 68 | }; |
| 69 | |
| 70 | // ============================================================================ |
| 71 | // wxEventLoopImpl implementation |
| 72 | // ============================================================================ |
| 73 | |
| 74 | void wxEventLoopImpl::Dispatch() |
| 75 | { |
| 76 | event_t evt; |
| 77 | |
| 78 | // VS: The code bellow is equal to MGL's EVT_halt implementation, with |
| 79 | // two things added: sleeping (busy waiting is stupid, lets make CPU's |
| 80 | // life a bit easier) and timers updating |
| 81 | |
| 82 | // EVT_halt(&evt, EVT_EVERYEVT); |
| 83 | for (;;) |
| 84 | { |
| 85 | #if wxUSE_TIMER |
| 86 | wxTimer::NotifyTimers(); |
| 87 | MGL_wmUpdateDC(g_winMng); |
| 88 | #endif |
| 89 | EVT_pollJoystick(); |
| 90 | if ( EVT_getNext(&evt, EVT_EVERYEVT) ) break; |
| 91 | PM_sleep(10); |
| 92 | } |
| 93 | // end of EVT_halt |
| 94 | |
| 95 | MGL_wmProcessEvent(g_winMng, &evt); |
| 96 | } |
| 97 | |
| 98 | bool wxEventLoopImpl::SendIdleEvent() |
| 99 | { |
| 100 | return wxTheApp->ProcessIdle(); |
| 101 | } |
| 102 | |
| 103 | // ============================================================================ |
| 104 | // wxEventLoop implementation |
| 105 | // ============================================================================ |
| 106 | |
| 107 | // ---------------------------------------------------------------------------- |
| 108 | // wxEventLoop running and exiting |
| 109 | // ---------------------------------------------------------------------------- |
| 110 | |
| 111 | wxEventLoop *wxEventLoop::ms_activeLoop = NULL; |
| 112 | |
| 113 | wxEventLoop::~wxEventLoop() |
| 114 | { |
| 115 | wxASSERT_MSG( !m_impl, _T("should have been deleted in Run()") ); |
| 116 | } |
| 117 | |
| 118 | bool wxEventLoop::IsRunning() const |
| 119 | { |
| 120 | return m_impl != NULL; |
| 121 | } |
| 122 | |
| 123 | int wxEventLoop::Run() |
| 124 | { |
| 125 | // event loops are not recursive, you need to create another loop! |
| 126 | wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") ); |
| 127 | |
| 128 | m_impl = new wxEventLoopImpl; |
| 129 | |
| 130 | wxEventLoop *oldLoop = ms_activeLoop; |
| 131 | ms_activeLoop = this; |
| 132 | |
| 133 | for ( ;; ) |
| 134 | { |
| 135 | #if wxUSE_THREADS |
| 136 | //wxMutexGuiLeaveOrEnter(); // FIXME_MGL - huh? |
| 137 | #endif // wxUSE_THREADS |
| 138 | |
| 139 | // generate and process idle events for as long as we don't have |
| 140 | // anything else to do |
| 141 | while ( !Pending() && m_impl->SendIdleEvent() ) {} |
| 142 | |
| 143 | // a message came or no more idle processing to do, sit in Dispatch() |
| 144 | // waiting for the next message |
| 145 | if ( !Dispatch() ) |
| 146 | { |
| 147 | // app terminated |
| 148 | break; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | int exitcode = m_impl->GetExitCode(); |
| 153 | delete m_impl; |
| 154 | m_impl = NULL; |
| 155 | |
| 156 | ms_activeLoop = oldLoop; |
| 157 | |
| 158 | return exitcode; |
| 159 | } |
| 160 | |
| 161 | void wxEventLoop::Exit(int rc) |
| 162 | { |
| 163 | wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") ); |
| 164 | |
| 165 | m_impl->SetExitCode(rc); |
| 166 | m_impl->SetKeepLooping(FALSE); |
| 167 | |
| 168 | // Send a dummy event so that the app won't block in EVT_halt if there |
| 169 | // are no user-generated events in the queue: |
| 170 | EVT_post(0, EVT_USEREVT, 0, 0); |
| 171 | } |
| 172 | |
| 173 | // ---------------------------------------------------------------------------- |
| 174 | // wxEventLoop message processing dispatching |
| 175 | // ---------------------------------------------------------------------------- |
| 176 | |
| 177 | bool wxEventLoop::Pending() const |
| 178 | { |
| 179 | // update the display here, so that wxYield refreshes display and |
| 180 | // changes take effect immediately, not after emptying events queue: |
| 181 | MGL_wmUpdateDC(g_winMng); |
| 182 | |
| 183 | // is there an event in the queue? |
| 184 | event_t evt; |
| 185 | return EVT_peekNext(&evt, EVT_EVERYEVT); |
| 186 | } |
| 187 | |
| 188 | bool wxEventLoop::Dispatch() |
| 189 | { |
| 190 | wxCHECK_MSG( IsRunning(), FALSE, _T("can't call Dispatch() if not running") ); |
| 191 | |
| 192 | m_impl->Dispatch(); |
| 193 | return m_impl->GetKeepLooping(); |
| 194 | } |