| 1 | /////////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/common/evtloopcmn.cpp |
| 3 | // Purpose: common wxEventLoop-related stuff |
| 4 | // Author: Vadim Zeitlin |
| 5 | // Modified by: |
| 6 | // Created: 2006-01-12 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) 2006 Vadim Zeitlin <vadim@wxwindows.org> |
| 9 | // Licence: wxWindows licence |
| 10 | /////////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | // ============================================================================ |
| 13 | // declarations |
| 14 | // ============================================================================ |
| 15 | |
| 16 | // ---------------------------------------------------------------------------- |
| 17 | // headers |
| 18 | // ---------------------------------------------------------------------------- |
| 19 | |
| 20 | // for compilers that support precompilation, includes "wx.h". |
| 21 | #include "wx/wxprec.h" |
| 22 | |
| 23 | #ifdef __BORLANDC__ |
| 24 | #pragma hdrstop |
| 25 | #endif |
| 26 | |
| 27 | #include "wx/evtloop.h" |
| 28 | |
| 29 | #ifndef WX_PRECOMP |
| 30 | #include "wx/app.h" |
| 31 | #endif //WX_PRECOMP |
| 32 | |
| 33 | // ---------------------------------------------------------------------------- |
| 34 | // globals |
| 35 | // ---------------------------------------------------------------------------- |
| 36 | |
| 37 | wxEventLoopBase *wxEventLoopBase::ms_activeLoop = NULL; |
| 38 | |
| 39 | // wxEventLoopManual is unused in the other ports |
| 40 | #if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXDFB__) || (defined(__UNIX__) && wxUSE_BASE) |
| 41 | |
| 42 | // ============================================================================ |
| 43 | // wxEventLoopManual implementation |
| 44 | // ============================================================================ |
| 45 | |
| 46 | wxEventLoopManual::wxEventLoopManual() |
| 47 | { |
| 48 | m_exitcode = 0; |
| 49 | m_shouldExit = false; |
| 50 | } |
| 51 | |
| 52 | int wxEventLoopManual::Run() |
| 53 | { |
| 54 | // event loops are not recursive, you need to create another loop! |
| 55 | wxCHECK_MSG( !IsRunning(), -1, _T("can't reenter a message loop") ); |
| 56 | |
| 57 | // ProcessIdle() and Dispatch() below may throw so the code here should |
| 58 | // be exception-safe, hence we must use local objects for all actions we |
| 59 | // should undo |
| 60 | wxEventLoopActivator activate(this); |
| 61 | |
| 62 | // we must ensure that OnExit() is called even if an exception is thrown |
| 63 | // from inside Dispatch() but we must call it from Exit() in normal |
| 64 | // situations because it is supposed to be called synchronously, |
| 65 | // wxModalEventLoop depends on this (so we can't just use ON_BLOCK_EXIT or |
| 66 | // something similar here) |
| 67 | #if wxUSE_EXCEPTIONS |
| 68 | for ( ;; ) |
| 69 | { |
| 70 | try |
| 71 | { |
| 72 | #endif // wxUSE_EXCEPTIONS |
| 73 | |
| 74 | // this is the event loop itself |
| 75 | for ( ;; ) |
| 76 | { |
| 77 | // give them the possibility to do whatever they want |
| 78 | OnNextIteration(); |
| 79 | |
| 80 | // generate and process idle events for as long as we don't |
| 81 | // have anything else to do |
| 82 | while ( !Pending() && (wxTheApp && wxTheApp->ProcessIdle()) ) |
| 83 | ; |
| 84 | |
| 85 | // if the "should exit" flag is set, the loop should terminate |
| 86 | // but not before processing any remaining messages so while |
| 87 | // Pending() returns true, do process them |
| 88 | if ( m_shouldExit ) |
| 89 | { |
| 90 | while ( Pending() ) |
| 91 | Dispatch(); |
| 92 | |
| 93 | break; |
| 94 | } |
| 95 | |
| 96 | // a message came or no more idle processing to do, sit in |
| 97 | // Dispatch() waiting for the next message |
| 98 | if ( !Dispatch() ) |
| 99 | { |
| 100 | // we got WM_QUIT |
| 101 | break; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | #if wxUSE_EXCEPTIONS |
| 106 | // exit the outer loop as well |
| 107 | break; |
| 108 | } |
| 109 | catch ( ... ) |
| 110 | { |
| 111 | try |
| 112 | { |
| 113 | if ( !wxTheApp || !wxTheApp->OnExceptionInMainLoop() ) |
| 114 | { |
| 115 | OnExit(); |
| 116 | break; |
| 117 | } |
| 118 | //else: continue running the event loop |
| 119 | } |
| 120 | catch ( ... ) |
| 121 | { |
| 122 | // OnException() throwed, possibly rethrowing the same |
| 123 | // exception again: very good, but we still need OnExit() to |
| 124 | // be called |
| 125 | OnExit(); |
| 126 | throw; |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | #endif // wxUSE_EXCEPTIONS |
| 131 | |
| 132 | return m_exitcode; |
| 133 | } |
| 134 | |
| 135 | void wxEventLoopManual::Exit(int rc) |
| 136 | { |
| 137 | wxCHECK_RET( IsRunning(), _T("can't call Exit() if not running") ); |
| 138 | |
| 139 | m_exitcode = rc; |
| 140 | m_shouldExit = true; |
| 141 | |
| 142 | OnExit(); |
| 143 | |
| 144 | // all we have to do to exit from the loop is to (maybe) wake it up so that |
| 145 | // it can notice that Exit() had been called |
| 146 | // |
| 147 | // in particular, do *not* use here calls such as PostQuitMessage() (under |
| 148 | // MSW) which terminate the current event loop here because we're not sure |
| 149 | // that it is going to be processed by the correct event loop: it would be |
| 150 | // possible that another one is started and terminated by mistake if we do |
| 151 | // this |
| 152 | WakeUp(); |
| 153 | } |
| 154 | |
| 155 | #endif // __WXMSW__ || __WXMAC__ || __WXDFB__ |