src/msw/tooltip.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/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 licence
  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 #if wxUSE_TOOLTIPS
  27
  28 #include "wx/tooltip.h"
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/app.h"
  32     #include "wx/control.h"
  33     #include "wx/combobox.h"
  34 #endif
  35
  36 #include "wx/tokenzr.h"
  37 #include "wx/msw/private.h"
  38
  39 // include <commctrl.h> "properly"
  40 #include "wx/msw/wrapcctl.h"
  41
  42 // VZ: normally, the trick with subclassing the tooltip control and processing
  43 //     TTM_WINDOWFROMPOINT should work but, somehow, it doesn't. I leave the
  44 //     code here for now (but it's not compiled) in case we need it later.
  45 //
  46 //     For now I use an ugly workaround and process TTN_NEEDTEXT directly in
  47 //     radio button wnd proc - fixing TTM_WINDOWFROMPOINT code would be nice
  48 //     because it would then work for all controls, not only radioboxes but for
  49 //     now I don't understand what's wrong with it...
  50 #define wxUSE_TTM_WINDOWFROMPOINT   0
  51
  52 // ----------------------------------------------------------------------------
  53 // global variables
  54 // ----------------------------------------------------------------------------
  55
  56 // the tooltip parent window
  57 WXHWND wxToolTip::ms_hwndTT = (WXHWND)NULL;
  58
  59 #if wxUSE_TTM_WINDOWFROMPOINT
  60
  61 // the tooltip window proc
  62 static WNDPROC gs_wndprocToolTip = (WNDPROC)NULL;
  63
  64 #endif // wxUSE_TTM_WINDOWFROMPOINT
  65
  66 // ----------------------------------------------------------------------------
  67 // private classes
  68 // ----------------------------------------------------------------------------
  69
  70 // a wrapper around TOOLINFO Win32 structure
  71 #ifdef __VISUALC__
  72     #pragma warning( disable : 4097 ) // we inherit from a typedef - so what?
  73 #endif
  74
  75 class wxToolInfo : public TOOLINFO
  76 {
  77 public:
  78     wxToolInfo(HWND hwndOwner)
  79     {
  80         // initialize all members
  81         ::ZeroMemory(this, sizeof(TOOLINFO));
  82
  83         // the structure TOOLINFO has been extended with a 4 byte field in
  84         // version 4.70 of comctl32.dll and if we compile on a newer machine
  85         // but run on one with the old version of comctl32, nothing will work
  86         // because the library will detect that we rely on a more recent
  87         // version of it. So we always use the old size - if we ever start
  88         // using our lParam member, we'd have to check for comctl32 version
  89         // during run-time
  90 #if _WIN32_IE >= 0x0300
  91         cbSize = sizeof(TOOLINFO) - sizeof(LPARAM);
  92 #else // old headers
  93         cbSize = sizeof(TOOLINFO);
  94 #endif // compile-time comctl32.dll version
  95
  96         hwnd = hwndOwner;
  97         uFlags = TTF_IDISHWND;
  98         uId = (UINT)hwndOwner;
  99     }
 100 };
 101
 102 #ifdef __VISUALC__
 103     #pragma warning( default : 4097 )
 104 #endif
 105
 106 // ----------------------------------------------------------------------------
 107 // private functions
 108 // ----------------------------------------------------------------------------
 109
 110 // send a message to the tooltip control if it exists
 111 //
 112 // NB: wParam is always 0 for the TTM_XXX messages we use
 113 static inline LRESULT SendTooltipMessage(WXHWND hwnd, UINT msg, void *lParam)
 114 {
 115     return hwnd ? ::SendMessage((HWND)hwnd, msg, 0, (LPARAM)lParam) : 0;
 116 }
 117
 118 // send a message to all existing tooltip controls
 119 static inline void
 120 SendTooltipMessageToAll(WXHWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 121 {
 122     if ( hwnd )
 123         ::SendMessage((HWND)hwnd, msg, wParam, lParam);
 124 }
 125
 126 // ============================================================================
 127 // implementation
 128 // ============================================================================
 129
 130 #if wxUSE_TTM_WINDOWFROMPOINT
 131
 132 // ----------------------------------------------------------------------------
 133 // window proc for our tooltip control
 134 // ----------------------------------------------------------------------------
 135
 136 LRESULT APIENTRY wxToolTipWndProc(HWND hwndTT,
 137                                   UINT msg,
 138                                   WPARAM wParam,
 139                                   LPARAM lParam)
 140 {
 141     if ( msg == TTM_WINDOWFROMPOINT )
 142     {
 143         LPPOINT ppt = (LPPOINT)lParam;
 144
 145         // the window on which event occurred
 146         HWND hwnd = ::WindowFromPoint(*ppt);
 147
 148         OutputDebugString("TTM_WINDOWFROMPOINT: ");
 149         OutputDebugString(wxString::Format("0x%08x => ", hwnd));
 150
 151         // return a HWND corresponding to a wxWindow because only wxWidgets are
 152         // associated with tooltips using TTM_ADDTOOL
 153         wxWindow *win = wxGetWindowFromHWND((WXHWND)hwnd);
 154
 155         if ( win )
 156         {
 157             hwnd = GetHwndOf(win);
 158             OutputDebugString(wxString::Format("0x%08x\r\n", hwnd));
 159
 160 #if 0
 161             // modify the point too!
 162             RECT rect;
 163             GetWindowRect(hwnd, &rect);
 164
 165             ppt->x = (rect.right - rect.left) / 2;
 166             ppt->y = (rect.bottom - rect.top) / 2;
 167 #endif // 0
 168             return (LRESULT)hwnd;
 169         }
 170         else
 171         {
 172             OutputDebugString("no window\r\n");
 173         }
 174     }
 175
 176     return ::CallWindowProc(CASTWNDPROC gs_wndprocToolTip, hwndTT, msg, wParam, lParam);
 177 }
 178
 179 #endif // wxUSE_TTM_WINDOWFROMPOINT
 180
 181 // ----------------------------------------------------------------------------
 182 // static functions
 183 // ----------------------------------------------------------------------------
 184
 185 void wxToolTip::Enable(bool flag)
 186 {
 187     SendTooltipMessageToAll(ms_hwndTT, TTM_ACTIVATE, flag, 0);
 188 }
 189
 190 void wxToolTip::SetDelay(long milliseconds)
 191 {
 192     SendTooltipMessageToAll(ms_hwndTT, TTM_SETDELAYTIME,
 193                             TTDT_INITIAL, milliseconds);
 194 }
 195
 196 // ---------------------------------------------------------------------------
 197 // implementation helpers
 198 // ---------------------------------------------------------------------------
 199
 200 // create the tooltip ctrl for our parent frame if it doesn't exist yet
 201 /* static */
 202 WXHWND wxToolTip::GetToolTipCtrl()
 203 {
 204     if ( !ms_hwndTT )
 205     {
 206         // we want to show the tooltips always (even when the window is not
 207         // active) and we don't want to strip "&"s from them
 208         ms_hwndTT = (WXHWND)::CreateWindow(TOOLTIPS_CLASS,
 209                                            (LPCTSTR)NULL,
 210                                            TTS_ALWAYSTIP | TTS_NOPREFIX,
 211                                            CW_USEDEFAULT, CW_USEDEFAULT,
 212                                            CW_USEDEFAULT, CW_USEDEFAULT,
 213                                            NULL, (HMENU)NULL,
 214                                            wxGetInstance(),
 215                                            NULL);
 216        if ( ms_hwndTT )
 217        {
 218            HWND hwnd = (HWND)ms_hwndTT;
 219            SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0,
 220                         SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
 221
 222 #if wxUSE_TTM_WINDOWFROMPOINT
 223            // subclass the newly created control
 224            gs_wndprocToolTip = wxSetWindowProc(hwnd, wxToolTipWndProc);
 225 #endif // wxUSE_TTM_WINDOWFROMPOINT
 226        }
 227     }
 228
 229     return ms_hwndTT;
 230 }
 231
 232 /* static */
 233 void wxToolTip::RelayEvent(WXMSG *msg)
 234 {
 235     (void)SendTooltipMessage(GetToolTipCtrl(), TTM_RELAYEVENT, msg);
 236 }
 237
 238 // ----------------------------------------------------------------------------
 239 // ctor & dtor
 240 // ----------------------------------------------------------------------------
 241
 242 IMPLEMENT_ABSTRACT_CLASS(wxToolTip, wxObject)
 243
 244 wxToolTip::wxToolTip(const wxString &tip)
 245          : m_text(tip)
 246 {
 247     m_window = NULL;
 248 }
 249
 250 wxToolTip::~wxToolTip()
 251 {
 252     // the tooltip has to be removed before deleting. Otherwise, if it is visible
 253     // while being deleted, there will be a delay before it goes away.
 254     Remove();
 255 }
 256
 257 // ----------------------------------------------------------------------------
 258 // others
 259 // ----------------------------------------------------------------------------
 260
 261 void wxToolTip::Remove(WXHWND hWnd)
 262 {
 263     wxToolInfo ti((HWND)hWnd);
 264     (void)SendTooltipMessage(GetToolTipCtrl(), TTM_DELTOOL, &ti);
 265 }
 266
 267 void wxToolTip::Remove()
 268 {
 269     // remove this tool from the tooltip control
 270     if ( m_window )
 271     {
 272         Remove(m_window->GetHWND());
 273     }
 274 }
 275
 276 void wxToolTip::Add(WXHWND hWnd)
 277 {
 278     HWND hwnd = (HWND)hWnd;
 279
 280     wxToolInfo ti(hwnd);
 281
 282     // another possibility would be to specify LPSTR_TEXTCALLBACK here as we
 283     // store the tooltip text ourselves anyhow, and provide it in response to
 284     // TTN_NEEDTEXT (sent via WM_NOTIFY), but then we would be limited to 79
 285     // character tooltips as this is the size of the szText buffer in
 286     // NMTTDISPINFO struct -- and setting the tooltip here we can have tooltips
 287     // of any length
 288     ti.hwnd = hwnd;
 289     ti.lpszText = (wxChar *)m_text.c_str(); // const_cast
 290
 291     if ( !SendTooltipMessage(GetToolTipCtrl(), TTM_ADDTOOL, &ti) )
 292     {
 293         wxLogDebug(_T("Failed to create the tooltip '%s'"), m_text.c_str());
 294     }
 295     else
 296     {
 297         // check for multiline toopltip
 298         int index = m_text.Find(_T('\n'));
 299
 300         if ( index != wxNOT_FOUND )
 301         {
 302 #ifdef TTM_SETMAXTIPWIDTH
 303             if ( wxApp::GetComCtl32Version() >= 470 )
 304             {
 305                 // use TTM_SETMAXTIPWIDTH to make tooltip multiline using the
 306                 // extent of its first line as max value
 307                 HFONT hfont = (HFONT)
 308                     SendTooltipMessage(GetToolTipCtrl(), WM_GETFONT, 0);
 309
 310                 if ( !hfont )
 311                 {
 312                     hfont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
 313                     if ( !hfont )
 314                     {
 315                         wxLogLastError(wxT("GetStockObject(DEFAULT_GUI_FONT)"));
 316                     }
 317                 }
 318
 319                 MemoryHDC hdc;
 320                 if ( !hdc )
 321                 {
 322                     wxLogLastError(wxT("CreateCompatibleDC(NULL)"));
 323                 }
 324
 325                 if ( !SelectObject(hdc, hfont) )
 326                 {
 327                     wxLogLastError(wxT("SelectObject(hfont)"));
 328                 }
 329
 330                 // find the width of the widest line
 331                 int max = 0;
 332                 wxStringTokenizer tokenizer(m_text, _T("\n"));
 333                 wxString token = tokenizer.GetNextToken();
 334                 while (token.length())
 335                 {
 336                     SIZE sz;
 337                     if ( !::GetTextExtentPoint32(hdc, token, token.length(), &sz) )
 338                     {
 339                         wxLogLastError(wxT("GetTextExtentPoint32"));
 340                     }
 341                     if ( sz.cx > max )
 342                         max = sz.cx;
 343
 344                     token = tokenizer.GetNextToken();
 345                 }
 346
 347                 // only set a new width if it is bigger than the current setting
 348                 if (max > SendTooltipMessage(GetToolTipCtrl(), TTM_GETMAXTIPWIDTH, 0))
 349                     SendTooltipMessage(GetToolTipCtrl(), TTM_SETMAXTIPWIDTH,
 350                                        (void *)max);
 351             }
 352             else
 353 #endif // comctl32.dll >= 4.70
 354             {
 355                 // replace the '\n's with spaces because otherwise they appear as
 356                 // unprintable characters in the tooltip string
 357                 m_text.Replace(_T("\n"), _T(" "));
 358                 ti.lpszText = (wxChar *)m_text.c_str(); // const_cast
 359
 360                 if ( !SendTooltipMessage(GetToolTipCtrl(), TTM_ADDTOOL, &ti) )
 361                 {
 362                     wxLogDebug(_T("Failed to create the tooltip '%s'"), m_text.c_str());
 363                 }
 364             }
 365         }
 366     }
 367 }
 368
 369 void wxToolTip::SetWindow(wxWindow *win)
 370 {
 371     Remove();
 372
 373     m_window = win;
 374
 375     // add the window itself
 376     if ( m_window )
 377     {
 378         Add(m_window->GetHWND());
 379     }
 380 #if !defined(__WXUNIVERSAL__)
 381     // and all of its subcontrols (e.g. radiobuttons in a radiobox) as well
 382     wxControl *control = wxDynamicCast(m_window, wxControl);
 383     if ( control )
 384     {
 385         const wxArrayLong& subcontrols = control->GetSubcontrols();
 386         size_t count = subcontrols.GetCount();
 387         for ( size_t n = 0; n < count; n++ )
 388         {
 389             int id = subcontrols[n];
 390             HWND hwnd = GetDlgItem(GetHwndOf(m_window), id);
 391             if ( !hwnd )
 392             {
 393                 // may be it's a child of parent of the control, in fact?
 394                 // (radiobuttons are subcontrols, i.e. children of the radiobox
 395                 // for wxWidgets but are its siblings at Windows level)
 396                 hwnd = GetDlgItem(GetHwndOf(m_window->GetParent()), id);
 397             }
 398
 399             // must have it by now!
 400             wxASSERT_MSG( hwnd, _T("no hwnd for subcontrol?") );
 401
 402             Add((WXHWND)hwnd);
 403         }
 404     }
 405
 406     // VZ: it's ugly to do it here, but I don't want any major changes right
 407     //     now, later we will probably want to have wxWindow::OnGotToolTip() or
 408     //     something like this where the derived class can do such things
 409     //     itself instead of wxToolTip "knowing" about them all
 410     wxComboBox *combo = wxDynamicCast(control, wxComboBox);
 411     if ( combo )
 412     {
 413         WXHWND hwndComboEdit = combo->GetWindowStyle() & wxCB_READONLY
 414                                 ? combo->GetHWND()
 415                                 : combo->GetEditHWND();
 416         if ( hwndComboEdit )
 417         {
 418             Add(hwndComboEdit);
 419         }
 420     }
 421 #endif // !defined(__WXUNIVERSAL__)
 422 }
 423
 424 void wxToolTip::SetTip(const wxString& tip)
 425 {
 426     m_text = tip;
 427
 428     if ( m_window )
 429     {
 430         // update the tip text shown by the control
 431         wxToolInfo ti(GetHwndOf(m_window));
 432         ti.lpszText = (wxChar *)m_text.c_str();
 433
 434         (void)SendTooltipMessage(GetToolTipCtrl(), TTM_UPDATETIPTEXT, &ti);
 435     }
 436 }
 437
 438 #endif // wxUSE_TOOLTIPS