src/msw/msgdlg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/msgdlg.cpp
   3 // Purpose:     wxMessageDialog
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_MSGDLG
  20
  21 #include "wx/msgdlg.h"
  22
  23 #ifndef WX_PRECOMP
  24     #include "wx/app.h"
  25     #include "wx/utils.h"
  26     #include "wx/dialog.h"
  27     #include "wx/hashmap.h"
  28 #endif
  29
  30 #include "wx/msw/private.h"
  31
  32 // For MB_TASKMODAL
  33 #ifdef __WXWINCE__
  34 #include "wx/msw/wince/missing.h"
  35 #endif
  36
  37 IMPLEMENT_CLASS(wxMessageDialog, wxDialog)
  38
  39 // there can potentially be one message box per thread so we use a hash map
  40 // with thread ids as keys and (currently shown) message boxes as values
  41 //
  42 // TODO: replace this with wxTLS once it's available
  43 WX_DECLARE_HASH_MAP(unsigned long, wxMessageDialog *,
  44                     wxIntegerHash, wxIntegerEqual,
  45                     wxMessageDialogMap);
  46
  47 namespace
  48 {
  49
  50 wxMessageDialogMap& HookMap()
  51 {
  52     static wxMessageDialogMap s_Map;
  53
  54     return s_Map;
  55 }
  56
  57 } // anonymous namespace
  58
  59 /* static */
  60 WXLRESULT wxCALLBACK
  61 wxMessageDialog::HookFunction(int code, WXWPARAM wParam, WXLPARAM lParam)
  62 {
  63     // Find the thread-local instance of wxMessageDialog
  64     const DWORD tid = ::GetCurrentThreadId();
  65     wxMessageDialogMap::iterator node = HookMap().find(tid);
  66     wxCHECK_MSG( node != HookMap().end(), false,
  67                     wxT("bogus thread id in wxMessageDialog::Hook") );
  68
  69     wxMessageDialog *  const wnd = node->second;
  70
  71     const HHOOK hhook = (HHOOK)wnd->m_hook;
  72     const LRESULT rc = ::CallNextHookEx(hhook, code, wParam, lParam);
  73
  74     if ( code == HC_ACTION && lParam )
  75     {
  76         const CWPRETSTRUCT * const s = (CWPRETSTRUCT *)lParam;
  77
  78         if ( s->message == HCBT_ACTIVATE )
  79         {
  80             // we won't need this hook any longer
  81             ::UnhookWindowsHookEx(hhook);
  82             wnd->m_hook = NULL;
  83             HookMap().erase(tid);
  84
  85             if ( wnd->GetMessageDialogStyle() & wxCENTER )
  86             {
  87                 wnd->SetHWND(s->hwnd);
  88                 wnd->Center(); // center on parent
  89                 wnd->SetHWND(NULL);
  90             }
  91             //else: default behaviour, center on screen
  92         }
  93     }
  94
  95     return rc;
  96 }
  97
  98 int wxMessageDialog::ShowModal()
  99 {
 100     if ( !wxTheApp->GetTopWindow() )
 101     {
 102         // when the message box is shown from wxApp::OnInit() (i.e. before the
 103         // message loop is entered), this must be done or the next message box
 104         // will never be shown - just try putting 2 calls to wxMessageBox() in
 105         // OnInit() to see it
 106         while ( wxTheApp->Pending() )
 107             wxTheApp->Dispatch();
 108     }
 109
 110     // use the top level window as parent if none specified
 111     if ( !m_parent )
 112         m_parent = FindSuitableParent();
 113     HWND hWnd = m_parent ? GetHwndOf(m_parent) : NULL;
 114
 115     // translate wx style in MSW
 116     unsigned int msStyle = MB_OK;
 117     const long wxStyle = GetMessageDialogStyle();
 118     if (wxStyle & wxYES_NO)
 119     {
 120 #if !(defined(__SMARTPHONE__) && defined(__WXWINCE__))
 121         if (wxStyle & wxCANCEL)
 122             msStyle = MB_YESNOCANCEL;
 123         else
 124 #endif // !(__SMARTPHONE__ && __WXWINCE__)
 125             msStyle = MB_YESNO;
 126
 127         if (wxStyle & wxNO_DEFAULT)
 128             msStyle |= MB_DEFBUTTON2;
 129     }
 130
 131     if (wxStyle & wxOK)
 132     {
 133         if (wxStyle & wxCANCEL)
 134             msStyle = MB_OKCANCEL;
 135         else
 136             msStyle = MB_OK;
 137     }
 138     if (wxStyle & wxICON_EXCLAMATION)
 139         msStyle |= MB_ICONEXCLAMATION;
 140     else if (wxStyle & wxICON_HAND)
 141         msStyle |= MB_ICONHAND;
 142     else if (wxStyle & wxICON_INFORMATION)
 143         msStyle |= MB_ICONINFORMATION;
 144     else if (wxStyle & wxICON_QUESTION)
 145         msStyle |= MB_ICONQUESTION;
 146
 147     if ( wxStyle & wxSTAY_ON_TOP )
 148         msStyle |= MB_TOPMOST;
 149
 150 #ifndef __WXWINCE__
 151     if ( wxTheApp->GetLayoutDirection() == wxLayout_RightToLeft )
 152         msStyle |= MB_RTLREADING | MB_RIGHT;
 153 #endif
 154
 155     if (hWnd)
 156         msStyle |= MB_APPLMODAL;
 157     else
 158         msStyle |= MB_TASKMODAL;
 159
 160     // per MSDN documentation for MessageBox() we can prefix the message with 2
 161     // right-to-left mark characters to tell the function to use RTL layout
 162     // (unfortunately this only works in Unicode builds)
 163     wxString message = GetFullMessage();
 164 #if wxUSE_UNICODE
 165     if ( wxTheApp->GetLayoutDirection() == wxLayout_RightToLeft )
 166     {
 167         // NB: not all compilers support \u escapes
 168         static const wchar_t wchRLM = 0x200f;
 169         message.Prepend(wxString(wchRLM, 2));
 170     }
 171 #endif // wxUSE_UNICODE
 172
 173     // install the hook if we need to position the dialog in a non-default way
 174     if ( wxStyle & wxCENTER )
 175     {
 176         const DWORD tid = ::GetCurrentThreadId();
 177         m_hook = ::SetWindowsHookEx(WH_CALLWNDPROCRET,
 178                                     &wxMessageDialog::HookFunction, NULL, tid);
 179         HookMap()[tid] = this;
 180     }
 181
 182     // do show the dialog
 183     int msAns = MessageBox(hWnd, message.wx_str(), m_caption.wx_str(), msStyle);
 184     int ans;
 185     switch (msAns)
 186     {
 187         default:
 188             wxFAIL_MSG(_T("unexpected ::MessageBox() return code"));
 189             // fall through
 190
 191         case IDCANCEL:
 192             ans = wxID_CANCEL;
 193             break;
 194         case IDOK:
 195             ans = wxID_OK;
 196             break;
 197         case IDYES:
 198             ans = wxID_YES;
 199             break;
 200         case IDNO:
 201             ans = wxID_NO;
 202             break;
 203     }
 204     return ans;
 205 }
 206
 207 #endif // wxUSE_MSGDLG