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 // there is no hook support under CE so we can't use the code for message box
  24 // positioning there
  25 #ifndef __WXWINCE__
  26     #define wxUSE_MSGBOX_HOOK 1
  27 #else
  28     #define wxUSE_MSGBOX_HOOK 0
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/app.h"
  33     #include "wx/utils.h"
  34     #include "wx/dialog.h"
  35     #if wxUSE_MSGBOX_HOOK
  36         #include "wx/hashmap.h"
  37     #endif
  38 #endif
  39
  40 #include "wx/msw/private.h"
  41
  42 // For MB_TASKMODAL
  43 #ifdef __WXWINCE__
  44 #include "wx/msw/wince/missing.h"
  45 #endif
  46
  47 IMPLEMENT_CLASS(wxMessageDialog, wxDialog)
  48
  49 #if wxUSE_MSGBOX_HOOK
  50
  51 // there can potentially be one message box per thread so we use a hash map
  52 // with thread ids as keys and (currently shown) message boxes as values
  53 //
  54 // TODO: replace this with wxTLS once it's available
  55 WX_DECLARE_HASH_MAP(unsigned long, wxMessageDialog *,
  56                     wxIntegerHash, wxIntegerEqual,
  57                     wxMessageDialogMap);
  58
  59 namespace
  60 {
  61
  62 wxMessageDialogMap& HookMap()
  63 {
  64     static wxMessageDialogMap s_Map;
  65
  66     return s_Map;
  67 }
  68
  69 } // anonymous namespace
  70
  71 /* static */
  72 WXLRESULT wxCALLBACK
  73 wxMessageDialog::HookFunction(int code, WXWPARAM wParam, WXLPARAM lParam)
  74 {
  75     // Find the thread-local instance of wxMessageDialog
  76     const DWORD tid = ::GetCurrentThreadId();
  77     wxMessageDialogMap::iterator node = HookMap().find(tid);
  78     wxCHECK_MSG( node != HookMap().end(), false,
  79                     wxT("bogus thread id in wxMessageDialog::Hook") );
  80
  81     wxMessageDialog *  const wnd = node->second;
  82
  83     const HHOOK hhook = (HHOOK)wnd->m_hook;
  84     const LRESULT rc = ::CallNextHookEx(hhook, code, wParam, lParam);
  85
  86     if ( code == HC_ACTION && lParam )
  87     {
  88         const CWPRETSTRUCT * const s = (CWPRETSTRUCT *)lParam;
  89
  90         if ( s->message == HCBT_ACTIVATE )
  91         {
  92             // we won't need this hook any longer
  93             ::UnhookWindowsHookEx(hhook);
  94             wnd->m_hook = NULL;
  95             HookMap().erase(tid);
  96
  97             if ( wnd->GetMessageDialogStyle() & wxCENTER )
  98             {
  99                 wnd->SetHWND(s->hwnd);
 100                 wnd->Center(); // center on parent
 101                 wnd->SetHWND(NULL);
 102             }
 103             //else: default behaviour, center on screen
 104         }
 105     }
 106
 107     return rc;
 108 }
 109
 110 #endif // wxUSE_MSGBOX_HOOK
 111
 112
 113 int wxMessageDialog::ShowModal()
 114 {
 115     if ( !wxTheApp->GetTopWindow() )
 116     {
 117         // when the message box is shown from wxApp::OnInit() (i.e. before the
 118         // message loop is entered), this must be done or the next message box
 119         // will never be shown - just try putting 2 calls to wxMessageBox() in
 120         // OnInit() to see it
 121         while ( wxTheApp->Pending() )
 122             wxTheApp->Dispatch();
 123     }
 124
 125     // use the top level window as parent if none specified
 126     if ( !m_parent )
 127         m_parent = FindSuitableParent();
 128     HWND hWnd = m_parent ? GetHwndOf(m_parent) : NULL;
 129
 130     // translate wx style in MSW
 131     unsigned int msStyle = MB_OK;
 132     const long wxStyle = GetMessageDialogStyle();
 133     if (wxStyle & wxYES_NO)
 134     {
 135 #if !(defined(__SMARTPHONE__) && defined(__WXWINCE__))
 136         if (wxStyle & wxCANCEL)
 137             msStyle = MB_YESNOCANCEL;
 138         else
 139 #endif // !(__SMARTPHONE__ && __WXWINCE__)
 140             msStyle = MB_YESNO;
 141
 142         if (wxStyle & wxNO_DEFAULT)
 143             msStyle |= MB_DEFBUTTON2;
 144     }
 145
 146     if (wxStyle & wxOK)
 147     {
 148         if (wxStyle & wxCANCEL)
 149             msStyle = MB_OKCANCEL;
 150         else
 151             msStyle = MB_OK;
 152     }
 153     if (wxStyle & wxICON_EXCLAMATION)
 154         msStyle |= MB_ICONEXCLAMATION;
 155     else if (wxStyle & wxICON_HAND)
 156         msStyle |= MB_ICONHAND;
 157     else if (wxStyle & wxICON_INFORMATION)
 158         msStyle |= MB_ICONINFORMATION;
 159     else if (wxStyle & wxICON_QUESTION)
 160         msStyle |= MB_ICONQUESTION;
 161
 162     if ( wxStyle & wxSTAY_ON_TOP )
 163         msStyle |= MB_TOPMOST;
 164
 165 #ifndef __WXWINCE__
 166     if ( wxTheApp->GetLayoutDirection() == wxLayout_RightToLeft )
 167         msStyle |= MB_RTLREADING | MB_RIGHT;
 168 #endif
 169
 170     if (hWnd)
 171         msStyle |= MB_APPLMODAL;
 172     else
 173         msStyle |= MB_TASKMODAL;
 174
 175     // per MSDN documentation for MessageBox() we can prefix the message with 2
 176     // right-to-left mark characters to tell the function to use RTL layout
 177     // (unfortunately this only works in Unicode builds)
 178     wxString message = GetFullMessage();
 179 #if wxUSE_UNICODE
 180     if ( wxTheApp->GetLayoutDirection() == wxLayout_RightToLeft )
 181     {
 182         // NB: not all compilers support \u escapes
 183         static const wchar_t wchRLM = 0x200f;
 184         message.Prepend(wxString(wchRLM, 2));
 185     }
 186 #endif // wxUSE_UNICODE
 187
 188 #if wxUSE_MSGBOX_HOOK
 189     // install the hook if we need to position the dialog in a non-default way
 190     if ( wxStyle & wxCENTER )
 191     {
 192         const DWORD tid = ::GetCurrentThreadId();
 193         m_hook = ::SetWindowsHookEx(WH_CALLWNDPROCRET,
 194                                     &wxMessageDialog::HookFunction, NULL, tid);
 195         HookMap()[tid] = this;
 196     }
 197 #endif // wxUSE_MSGBOX_HOOK
 198
 199     // do show the dialog
 200     int msAns = MessageBox(hWnd, message.wx_str(), m_caption.wx_str(), msStyle);
 201     int ans;
 202     switch (msAns)
 203     {
 204         default:
 205             wxFAIL_MSG(_T("unexpected ::MessageBox() return code"));
 206             // fall through
 207
 208         case IDCANCEL:
 209             ans = wxID_CANCEL;
 210             break;
 211         case IDOK:
 212             ans = wxID_OK;
 213             break;
 214         case IDYES:
 215             ans = wxID_YES;
 216             break;
 217         case IDNO:
 218             ans = wxID_NO;
 219             break;
 220     }
 221     return ans;
 222 }
 223
 224 #endif // wxUSE_MSGDLG