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/msw/wrapcctl.h" // include <commctrl.h> "properly"
  32     #include "wx/app.h"
  33     #include "wx/control.h"
  34 #endif
  35
  36 #include "wx/tokenzr.h"
  37 #include "wx/msw/private.h"
  38
  39 #ifndef TTTOOLINFO_V1_SIZE
  40     #define TTTOOLINFO_V1_SIZE 0x28
  41 #endif
  42
  43 #ifndef TTF_TRANSPARENT
  44     #define TTF_TRANSPARENT 0x0100
  45 #endif
  46
  47 // VZ: normally, the trick with subclassing the tooltip control and processing
  48 //     TTM_WINDOWFROMPOINT should work but, somehow, it doesn't. I leave the
  49 //     code here for now (but it's not compiled) in case we need it later.
  50 //
  51 //     For now I use an ugly workaround and process TTN_NEEDTEXT directly in
  52 //     radio button wnd proc - fixing TTM_WINDOWFROMPOINT code would be nice
  53 //     because it would then work for all controls, not only radioboxes but for
  54 //     now I don't understand what's wrong with it...
  55 #define wxUSE_TTM_WINDOWFROMPOINT   0
  56
  57 // ----------------------------------------------------------------------------
  58 // global variables
  59 // ----------------------------------------------------------------------------
  60
  61 // the tooltip parent window
  62 WXHWND wxToolTip::ms_hwndTT = (WXHWND)NULL;
  63
  64 // new tooltip maximum width, default value is set on first call to wxToolTip::Add()
  65 int wxToolTip::ms_maxWidth = 0;
  66
  67 #if wxUSE_TTM_WINDOWFROMPOINT
  68
  69 // the tooltip window proc
  70 static WNDPROC gs_wndprocToolTip = (WNDPROC)NULL;
  71
  72 #endif // wxUSE_TTM_WINDOWFROMPOINT
  73
  74 // ----------------------------------------------------------------------------
  75 // private classes
  76 // ----------------------------------------------------------------------------
  77
  78 // a wrapper around TOOLINFO Win32 structure
  79 #ifdef __VISUALC__
  80     #pragma warning( disable : 4097 ) // we inherit from a typedef - so what?
  81 #endif
  82
  83 class wxToolInfo : public TOOLINFO
  84 {
  85 public:
  86     wxToolInfo(HWND hwndOwner)
  87     {
  88         // initialize all members
  89         ::ZeroMemory(this, sizeof(TOOLINFO));
  90
  91         // the structure TOOLINFO has been extended with a 4 byte field in
  92         // version 4.70 of comctl32.dll and another one in 5.01 but we don't
  93         // use these extended fields so use the old struct size to ensure that
  94         // the tooltips work on old (Windows 95) systems too
  95         cbSize = TTTOOLINFO_V1_SIZE;
  96
  97         hwnd = hwndOwner;
  98         uFlags = TTF_IDISHWND;
  99
 100         // we use TTF_TRANSPARENT to fix a problem which arises at least with
 101         // the text controls but may presumably happen with other controls
 102         // which display the tooltip at mouse position: it can start flashing
 103         // then as the control gets "focus lost" events and dismisses the
 104         // tooltip which then reappears because mouse remains hovering over the
 105         // control, see SF patch 1821229
 106         if ( wxApp::GetComCtl32Version() >= 470 )
 107         {
 108             uFlags |= TTF_TRANSPARENT;
 109         }
 110
 111         uId = (UINT_PTR)hwndOwner;
 112     }
 113 };
 114
 115 #ifdef __VISUALC__
 116     #pragma warning( default : 4097 )
 117 #endif
 118
 119 // ----------------------------------------------------------------------------
 120 // private functions
 121 // ----------------------------------------------------------------------------
 122
 123 // send a message to the tooltip control if it exists
 124 //
 125 // NB: wParam is always 0 for the TTM_XXX messages we use
 126 static inline LRESULT SendTooltipMessage(WXHWND hwnd, UINT msg, void *lParam)
 127 {
 128     return hwnd ? ::SendMessage((HWND)hwnd, msg, 0, (LPARAM)lParam) : 0;
 129 }
 130
 131 // send a message to all existing tooltip controls
 132 static inline void
 133 SendTooltipMessageToAll(WXHWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 134 {
 135     if ( hwnd )
 136         ::SendMessage((HWND)hwnd, msg, wParam, lParam);
 137 }
 138
 139 // ============================================================================
 140 // implementation
 141 // ============================================================================
 142
 143 #if wxUSE_TTM_WINDOWFROMPOINT
 144
 145 // ----------------------------------------------------------------------------
 146 // window proc for our tooltip control
 147 // ----------------------------------------------------------------------------
 148
 149 LRESULT APIENTRY wxToolTipWndProc(HWND hwndTT,
 150                                   UINT msg,
 151                                   WPARAM wParam,
 152                                   LPARAM lParam)
 153 {
 154     if ( msg == TTM_WINDOWFROMPOINT )
 155     {
 156         LPPOINT ppt = (LPPOINT)lParam;
 157
 158         // the window on which event occurred
 159         HWND hwnd = ::WindowFromPoint(*ppt);
 160
 161         OutputDebugString("TTM_WINDOWFROMPOINT: ");
 162         OutputDebugString(wxString::Format("0x%08x => ", hwnd));
 163
 164         // return a HWND corresponding to a wxWindow because only wxWidgets are
 165         // associated with tooltips using TTM_ADDTOOL
 166         wxWindow *win = wxGetWindowFromHWND((WXHWND)hwnd);
 167
 168         if ( win )
 169         {
 170             hwnd = GetHwndOf(win);
 171             OutputDebugString(wxString::Format("0x%08x\r\n", hwnd));
 172
 173 #if 0
 174             // modify the point too!
 175             RECT rect;
 176             GetWindowRect(hwnd, &rect);
 177
 178             ppt->x = (rect.right - rect.left) / 2;
 179             ppt->y = (rect.bottom - rect.top) / 2;
 180 #endif // 0
 181             return (LRESULT)hwnd;
 182         }
 183         else
 184         {
 185             OutputDebugString("no window\r\n");
 186         }
 187     }
 188
 189     return ::CallWindowProc(CASTWNDPROC gs_wndprocToolTip, hwndTT, msg, wParam, lParam);
 190 }
 191
 192 #endif // wxUSE_TTM_WINDOWFROMPOINT
 193
 194 // ----------------------------------------------------------------------------
 195 // static functions
 196 // ----------------------------------------------------------------------------
 197
 198 void wxToolTip::Enable(bool flag)
 199 {
 200     SendTooltipMessageToAll(ms_hwndTT, TTM_ACTIVATE, flag, 0);
 201 }
 202
 203 void wxToolTip::SetDelay(long milliseconds)
 204 {
 205     SendTooltipMessageToAll(ms_hwndTT, TTM_SETDELAYTIME,
 206                             TTDT_INITIAL, milliseconds);
 207 }
 208
 209 void wxToolTip::SetAutoPop(long milliseconds)
 210 {
 211     SendTooltipMessageToAll(ms_hwndTT, TTM_SETDELAYTIME,
 212                             TTDT_AUTOPOP, milliseconds);
 213 }
 214
 215 void wxToolTip::SetReshow(long milliseconds)
 216 {
 217     SendTooltipMessageToAll(ms_hwndTT, TTM_SETDELAYTIME,
 218                             TTDT_RESHOW, milliseconds);
 219 }
 220
 221 void wxToolTip::SetMaxWidth(int width)
 222 {
 223     wxASSERT_MSG( width == -1 || width >= 0, _T("invalid width value") );
 224
 225     ms_maxWidth = width;
 226 }
 227
 228 // ---------------------------------------------------------------------------
 229 // implementation helpers
 230 // ---------------------------------------------------------------------------
 231
 232 // create the tooltip ctrl for our parent frame if it doesn't exist yet
 233 /* static */
 234 WXHWND wxToolTip::GetToolTipCtrl()
 235 {
 236     if ( !ms_hwndTT )
 237     {
 238         WXDWORD exflags = 0;
 239         if ( wxTheApp->GetLayoutDirection() == wxLayout_RightToLeft )
 240         {
 241             exflags |= WS_EX_LAYOUTRTL;
 242         }
 243
 244         // we want to show the tooltips always (even when the window is not
 245         // active) and we don't want to strip "&"s from them
 246         ms_hwndTT = (WXHWND)::CreateWindowEx(exflags,
 247                                              TOOLTIPS_CLASS,
 248                                              (LPCTSTR)NULL,
 249                                              TTS_ALWAYSTIP | TTS_NOPREFIX,
 250                                              CW_USEDEFAULT, CW_USEDEFAULT,
 251                                              CW_USEDEFAULT, CW_USEDEFAULT,
 252                                              NULL, (HMENU)NULL,
 253                                              wxGetInstance(),
 254                                              NULL);
 255        if ( ms_hwndTT )
 256        {
 257            HWND hwnd = (HWND)ms_hwndTT;
 258            SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0,
 259                         SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
 260
 261 #if wxUSE_TTM_WINDOWFROMPOINT
 262            // subclass the newly created control
 263            gs_wndprocToolTip = wxSetWindowProc(hwnd, wxToolTipWndProc);
 264 #endif // wxUSE_TTM_WINDOWFROMPOINT
 265        }
 266     }
 267
 268     return ms_hwndTT;
 269 }
 270
 271 /* static */
 272 void wxToolTip::RelayEvent(WXMSG *msg)
 273 {
 274     (void)SendTooltipMessage(GetToolTipCtrl(), TTM_RELAYEVENT, msg);
 275 }
 276
 277 // ----------------------------------------------------------------------------
 278 // ctor & dtor
 279 // ----------------------------------------------------------------------------
 280
 281 IMPLEMENT_ABSTRACT_CLASS(wxToolTip, wxObject)
 282
 283 wxToolTip::wxToolTip(const wxString &tip)
 284          : m_text(tip)
 285 {
 286     m_window = NULL;
 287 }
 288
 289 wxToolTip::~wxToolTip()
 290 {
 291     // the tooltip has to be removed before deleting. Otherwise, if it is visible
 292     // while being deleted, there will be a delay before it goes away.
 293     Remove();
 294 }
 295
 296 // ----------------------------------------------------------------------------
 297 // others
 298 // ----------------------------------------------------------------------------
 299
 300 void wxToolTip::Remove(WXHWND hWnd)
 301 {
 302     wxToolInfo ti((HWND)hWnd);
 303     (void)SendTooltipMessage(GetToolTipCtrl(), TTM_DELTOOL, &ti);
 304 }
 305
 306 void wxToolTip::Remove()
 307 {
 308     // remove this tool from the tooltip control
 309     if ( m_window )
 310     {
 311         Remove(m_window->GetHWND());
 312     }
 313 }
 314
 315 void wxToolTip::Add(WXHWND hWnd)
 316 {
 317     HWND hwnd = (HWND)hWnd;
 318
 319     wxToolInfo ti(hwnd);
 320
 321     // another possibility would be to specify LPSTR_TEXTCALLBACK here as we
 322     // store the tooltip text ourselves anyhow, and provide it in response to
 323     // TTN_NEEDTEXT (sent via WM_NOTIFY), but then we would be limited to 79
 324     // character tooltips as this is the size of the szText buffer in
 325     // NMTTDISPINFO struct -- and setting the tooltip here we can have tooltips
 326     // of any length
 327     ti.hwnd = hwnd;
 328     ti.lpszText = (wxChar *)m_text.wx_str(); // const_cast
 329
 330     if ( !SendTooltipMessage(GetToolTipCtrl(), TTM_ADDTOOL, &ti) )
 331     {
 332         wxLogDebug(_T("Failed to create the tooltip '%s'"), m_text.c_str());
 333     }
 334     else
 335     {
 336 #ifdef TTM_SETMAXTIPWIDTH
 337         if ( wxApp::GetComCtl32Version() >= 470 )
 338         {
 339             // use TTM_SETMAXTIPWIDTH to make tooltip multiline using the
 340             // extent of its first line as max value
 341             HFONT hfont = (HFONT)
 342                 SendTooltipMessage(GetToolTipCtrl(), WM_GETFONT, 0);
 343
 344             if ( !hfont )
 345             {
 346                 hfont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
 347                 if ( !hfont )
 348                 {
 349                     wxLogLastError(wxT("GetStockObject(DEFAULT_GUI_FONT)"));
 350                 }
 351             }
 352
 353             MemoryHDC hdc;
 354             if ( !hdc )
 355             {
 356                 wxLogLastError(wxT("CreateCompatibleDC(NULL)"));
 357             }
 358
 359             if ( !SelectObject(hdc, hfont) )
 360             {
 361                 wxLogLastError(wxT("SelectObject(hfont)"));
 362             }
 363
 364             // find the width of the widest line
 365             int maxWidth = 0;
 366             wxStringTokenizer tokenizer(m_text, _T("\n"));
 367             while ( tokenizer.HasMoreTokens() )
 368             {
 369                 const wxString token = tokenizer.GetNextToken();
 370
 371                 SIZE sz;
 372                 if ( !::GetTextExtentPoint32(hdc, token.wx_str(),
 373                                              token.length(), &sz) )
 374                 {
 375                     wxLogLastError(wxT("GetTextExtentPoint32"));
 376                 }
 377
 378                 if ( sz.cx > maxWidth )
 379                     maxWidth = sz.cx;
 380             }
 381
 382             // limit size to ms_maxWidth, if set
 383             if ( ms_maxWidth == 0 )
 384             {
 385                 // this is more or less arbitrary but seems to work well
 386                 static const int DEFAULT_MAX_WIDTH = 400;
 387
 388                 ms_maxWidth = wxGetClientDisplayRect().width / 2;
 389
 390                 if ( ms_maxWidth > DEFAULT_MAX_WIDTH )
 391                     ms_maxWidth = DEFAULT_MAX_WIDTH;
 392             }
 393
 394             if ( ms_maxWidth != -1 && maxWidth > ms_maxWidth )
 395                 maxWidth = ms_maxWidth;
 396
 397             // only set a new width if it is bigger than the current setting
 398             SendTooltipMessage(GetToolTipCtrl(), TTM_SETMAXTIPWIDTH,
 399                                wxUIntToPtr(maxWidth));
 400         }
 401         else
 402 #endif // TTM_SETMAXTIPWIDTH
 403         {
 404             // replace the '\n's with spaces because otherwise they appear as
 405             // unprintable characters in the tooltip string
 406             m_text.Replace(_T("\n"), _T(" "));
 407             ti.lpszText = (wxChar *)m_text.wx_str(); // const_cast
 408
 409             if ( !SendTooltipMessage(GetToolTipCtrl(), TTM_ADDTOOL, &ti) )
 410             {
 411                 wxLogDebug(_T("Failed to create the tooltip '%s'"), m_text.c_str());
 412             }
 413         }
 414     }
 415 }
 416
 417 void wxToolTip::SetWindow(wxWindow *win)
 418 {
 419     Remove();
 420
 421     m_window = win;
 422
 423     // add the window itself
 424     if ( m_window )
 425     {
 426         Add(m_window->GetHWND());
 427     }
 428 #if !defined(__WXUNIVERSAL__)
 429     // and all of its subcontrols (e.g. radio buttons in a radiobox) as well
 430     wxControl *control = wxDynamicCast(m_window, wxControl);
 431     if ( control )
 432     {
 433         const wxArrayLong& subcontrols = control->GetSubcontrols();
 434         size_t count = subcontrols.GetCount();
 435         for ( size_t n = 0; n < count; n++ )
 436         {
 437             int id = subcontrols[n];
 438             HWND hwnd = GetDlgItem(GetHwndOf(m_window), id);
 439             if ( !hwnd )
 440             {
 441                 // may be it's a child of parent of the control, in fact?
 442                 // (radiobuttons are subcontrols, i.e. children of the radiobox
 443                 // for wxWidgets but are its siblings at Windows level)
 444                 hwnd = GetDlgItem(GetHwndOf(m_window->GetParent()), id);
 445             }
 446
 447             // must have it by now!
 448             wxASSERT_MSG( hwnd, _T("no hwnd for subcontrol?") );
 449
 450             Add((WXHWND)hwnd);
 451         }
 452     }
 453 #endif // !defined(__WXUNIVERSAL__)
 454 }
 455
 456 void wxToolTip::SetTip(const wxString& tip)
 457 {
 458     m_text = tip;
 459
 460     if ( m_window )
 461     {
 462         // update the tip text shown by the control
 463         wxToolInfo ti(GetHwndOf(m_window));
 464         ti.lpszText = (wxChar *)m_text.wx_str();
 465
 466         (void)SendTooltipMessage(GetToolTipCtrl(), TTM_UPDATETIPTEXT, &ti);
 467     }
 468 }
 469
 470 #endif // wxUSE_TOOLTIPS