src/msw/tooltip.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/tooltip.cpp
   3 // Purpose:     wxToolTip class implementation for MSW
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     31.01.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1999 Vadim Zeitlin
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/wx.h"
  28 #endif
  29
  30 #if wxUSE_TOOLTIPS
  31
  32 #include "wx/tooltip.h"
  33 #include "wx/msw/private.h"
  34
  35 #if (defined(__WIN95__) && !defined(__GNUWIN32__)) || defined(__TWIN32__)
  36 #include <commctrl.h>
  37 #endif
  38
  39 // ----------------------------------------------------------------------------
  40 // private classes
  41 // ----------------------------------------------------------------------------
  42
  43 // a simple wrapper around TOOLINFO Win32 structure
  44 class wxToolInfo : public TOOLINFO
  45 {
  46 public:
  47     wxToolInfo(wxWindow *win)
  48     {
  49         // initialize all members
  50 #ifdef __GNUWIN32__
  51         memset(this, 0, sizeof(TOOLINFO));
  52 #else
  53         ::ZeroMemory(this, sizeof(TOOLINFO));
  54 #endif
  55
  56         cbSize = sizeof(TOOLINFO);
  57         uFlags = TTF_IDISHWND;
  58         uId = (UINT)win->GetHWND();
  59     }
  60 };
  61
  62 // ----------------------------------------------------------------------------
  63 // private functions
  64 // ----------------------------------------------------------------------------
  65
  66 // send a message to the tooltip control
  67 inline LRESULT SendTooltipMessage(WXHWND hwnd,
  68                                   UINT msg,
  69                                   WPARAM wParam,
  70                                   void *lParam)
  71 {
  72     return hwnd ? ::SendMessage((HWND)hwnd, msg, wParam, (LPARAM)lParam)
  73                 : 0;
  74 }
  75
  76 // send a message to all existing tooltip controls
  77 static void SendTooltipMessageToAll(UINT msg, WPARAM wParam, LPARAM lParam)
  78 {
  79     // NB: it might be somewhat easier to maintain a list of all existing
  80     //     wxToolTip controls (put them there in ctor, delete from the list
  81     //     in dtor) - may be it's worth doing it this way? OTOH, typical
  82     //     application won't have many top level windows, so iterating over all
  83     //     of them shouldnt' take much time neither...
  84
  85     // iterate over all top level windows and send message to the tooltip
  86     // control of each and every of them (or more precisely to all dialogs and
  87     // frames)
  88     wxDialog *dialog = NULL;
  89     wxFrame *frame = NULL;
  90
  91     wxNode *node = wxTopLevelWindows.First();
  92     while ( node )
  93     {
  94         wxWindow *win = (wxWindow *)node->Data();
  95
  96         node = node->Next();
  97
  98         if ( win->IsKindOf(CLASSINFO(wxFrame)) )
  99         {
 100             frame = (wxFrame *)win;
 101             dialog = NULL;
 102         }
 103         else if ( win->IsKindOf(CLASSINFO(wxDialog)) )
 104         {
 105             dialog = (wxDialog *)win;
 106             frame = NULL;
 107         }
 108         else
 109         {
 110             // skip this strange top level window
 111             continue;
 112         }
 113
 114         wxASSERT_MSG( dialog || frame, _T("logic error") );
 115
 116         WXHWND hwndTT = frame ? frame->GetToolTipCtrl()
 117                               : dialog->GetToolTipCtrl();
 118         if ( hwndTT )
 119         {
 120             (void)SendTooltipMessage(hwndTT, msg, wParam, (void *)lParam);
 121         }
 122     }
 123 }
 124
 125 // ============================================================================
 126 // implementation
 127 // ============================================================================
 128
 129 // ----------------------------------------------------------------------------
 130 // static functions
 131 // ----------------------------------------------------------------------------
 132
 133 void wxToolTip::Enable(bool flag)
 134 {
 135     SendTooltipMessageToAll(TTM_ACTIVATE, flag, 0);
 136 }
 137
 138 void wxToolTip::SetDelay(long milliseconds)
 139 {
 140     SendTooltipMessageToAll(TTM_SETDELAYTIME, TTDT_INITIAL, milliseconds);
 141 }
 142
 143 // ---------------------------------------------------------------------------
 144 // implementation helpers
 145 // ---------------------------------------------------------------------------
 146
 147 // create the tooltip ctrl for our parent frame if it doesn't exist yet
 148 WXHWND wxToolTip::GetToolTipCtrl()
 149 {
 150     // find either parent dialog or parent frame - tooltip controls are managed
 151     // by these 2 classes only (it doesn't make sense to create one tooltip per
 152     // each and every wxWindow)
 153     wxFrame *frame = NULL;
 154     wxDialog *dialog = NULL;
 155
 156     wxWindow *parent = m_window;
 157     while ( parent )
 158     {
 159         if ( parent->IsKindOf(CLASSINFO(wxFrame)) )
 160         {
 161             frame = (wxFrame *)parent;
 162
 163             break;
 164         }
 165         else if ( parent->IsKindOf(CLASSINFO(wxDialog)) )
 166         {
 167             dialog = (wxDialog *)parent;
 168
 169             break;
 170         }
 171
 172         parent = parent->GetParent();
 173     }
 174
 175     wxCHECK_MSG( frame || dialog, 0,
 176                  _T("can't create tooltip control outside a frame or a dialog") );
 177
 178     HWND hwndTT = (HWND)(frame ? frame->GetToolTipCtrl()
 179                                : dialog->GetToolTipCtrl());
 180     if ( !hwndTT )
 181     {
 182         hwndTT = ::CreateWindow(TOOLTIPS_CLASS,
 183                                 (LPSTR)NULL,
 184                                 TTS_ALWAYSTIP,
 185                                 CW_USEDEFAULT, CW_USEDEFAULT,
 186                                 CW_USEDEFAULT, CW_USEDEFAULT,
 187                                 (HWND)parent->GetHWND(), (HMENU)NULL,
 188                                 wxGetInstance(), NULL);
 189
 190         if ( hwndTT )
 191         {
 192             if ( frame )
 193                 frame->SetToolTipCtrl((WXHWND)hwndTT);
 194             else
 195                 dialog->SetToolTipCtrl((WXHWND)hwndTT);
 196         }
 197         else
 198         {
 199             wxLogSysError(_("Can not create tooltip control"));
 200         }
 201     }
 202
 203     return (WXHWND)hwndTT;
 204 }
 205
 206 void wxToolTip::RelayEvent(WXMSG *msg)
 207 {
 208     (void)SendTooltipMessage(GetToolTipCtrl(), TTM_RELAYEVENT, 0, msg);
 209 }
 210
 211 // ----------------------------------------------------------------------------
 212 // ctor & dtor
 213 // ----------------------------------------------------------------------------
 214
 215 wxToolTip::wxToolTip(const wxString &tip)
 216          : m_text(tip)
 217 {
 218     m_window = NULL;
 219 }
 220
 221 wxToolTip::~wxToolTip()
 222 {
 223     // there is no need to Remove() this tool - it will be done automatically
 224     // anyhow
 225 }
 226
 227 // ----------------------------------------------------------------------------
 228 // others
 229 // ----------------------------------------------------------------------------
 230
 231 void wxToolTip::Remove()
 232 {
 233     // remove this tool from the tooltip control
 234     if ( m_window )
 235     {
 236         wxToolInfo ti(m_window);
 237         (void)SendTooltipMessage(GetToolTipCtrl(), TTM_DELTOOL, 0, &ti);
 238     }
 239 }
 240
 241 void wxToolTip::SetWindow(wxWindow *win)
 242 {
 243     Remove();
 244
 245     m_window = win;
 246
 247     if ( m_window )
 248     {
 249         wxToolInfo ti(m_window);
 250
 251         // as we store our text anyhow, it seems useless to waste system memory
 252         // by asking the tooltip ctrl to remember it too - instead it will send
 253         // us TTN_NEEDTEXT (via WM_NOTIFY) when it is about to be shown
 254         ti.hwnd = (HWND)m_window->GetHWND();
 255         ti.lpszText = LPSTR_TEXTCALLBACK;
 256         // instead of: ti.lpszText = (char *)m_text.c_str();
 257
 258         if ( !SendTooltipMessage(GetToolTipCtrl(), TTM_ADDTOOL, 0, &ti) )
 259         {
 260             wxLogSysError(_("Failed to create the tooltip '%s'"),
 261                           m_text.c_str());
 262         }
 263     }
 264 }
 265
 266 void wxToolTip::SetTip(const wxString& tip)
 267 {
 268     m_text = tip;
 269
 270     if ( m_window )
 271     {
 272         // update it immediately
 273         wxToolInfo ti(m_window);
 274         ti.lpszText = (wxChar *)m_text.c_str();
 275
 276         (void)SendTooltipMessage(GetToolTipCtrl(), TTM_UPDATETIPTEXT, 0, &ti);
 277     }
 278 }
 279
 280 #endif // wxUSE_TOOLTIPS