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     #include "wx/combobox.h"
  35 #endif
  36
  37 #include "wx/tokenzr.h"
  38 #include "wx/msw/private.h"
  39
  40 // VZ: normally, the trick with subclassing the tooltip control and processing
  41 //     TTM_WINDOWFROMPOINT should work but, somehow, it doesn't. I leave the
  42 //     code here for now (but it's not compiled) in case we need it later.
  43 //
  44 //     For now I use an ugly workaround and process TTN_NEEDTEXT directly in
  45 //     radio button wnd proc - fixing TTM_WINDOWFROMPOINT code would be nice
  46 //     because it would then work for all controls, not only radioboxes but for
  47 //     now I don't understand what's wrong with it...
  48 #define wxUSE_TTM_WINDOWFROMPOINT   0
  49
  50 // ----------------------------------------------------------------------------
  51 // global variables
  52 // ----------------------------------------------------------------------------
  53
  54 // the tooltip parent window
  55 WXHWND wxToolTip::ms_hwndTT = (WXHWND)NULL;
  56
  57 #if wxUSE_TTM_WINDOWFROMPOINT
  58
  59 // the tooltip window proc
  60 static WNDPROC gs_wndprocToolTip = (WNDPROC)NULL;
  61
  62 #endif // wxUSE_TTM_WINDOWFROMPOINT
  63
  64 // ----------------------------------------------------------------------------
  65 // private classes
  66 // ----------------------------------------------------------------------------
  67
  68 // a wrapper around TOOLINFO Win32 structure
  69 #ifdef __VISUALC__
  70     #pragma warning( disable : 4097 ) // we inherit from a typedef - so what?
  71 #endif
  72
  73 class wxToolInfo : public TOOLINFO
  74 {
  75 public:
  76     wxToolInfo(HWND hwndOwner)
  77     {
  78         // initialize all members
  79         ::ZeroMemory(this, sizeof(TOOLINFO));
  80
  81         // the structure TOOLINFO has been extended with a 4 byte field in
  82         // version 4.70 of comctl32.dll and if we compile on a newer machine
  83         // but run on one with the old version of comctl32, nothing will work
  84         // because the library will detect that we rely on a more recent
  85         // version of it. So we always use the old size - if we ever start
  86         // using our lParam member, we'd have to check for comctl32 version
  87         // during run-time
  88 #if _WIN32_IE >= 0x0300
  89         cbSize = sizeof(TOOLINFO) - sizeof(LPARAM);
  90 #else // old headers
  91         cbSize = sizeof(TOOLINFO);
  92 #endif // compile-time comctl32.dll version
  93
  94         hwnd = hwndOwner;
  95         uFlags = TTF_IDISHWND;
  96         uId = (UINT)hwndOwner;
  97     }
  98 };
  99
 100 #ifdef __VISUALC__
 101     #pragma warning( default : 4097 )
 102 #endif
 103
 104 // ----------------------------------------------------------------------------
 105 // private functions
 106 // ----------------------------------------------------------------------------
 107
 108 // send a message to the tooltip control if it exists
 109 //
 110 // NB: wParam is always 0 for the TTM_XXX messages we use
 111 static inline LRESULT SendTooltipMessage(WXHWND hwnd, UINT msg, void *lParam)
 112 {
 113     return hwnd ? ::SendMessage((HWND)hwnd, msg, 0, (LPARAM)lParam) : 0;
 114 }
 115
 116 // send a message to all existing tooltip controls
 117 static inline void
 118 SendTooltipMessageToAll(WXHWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 119 {
 120     if ( hwnd )
 121         ::SendMessage((HWND)hwnd, msg, wParam, lParam);
 122 }
 123
 124 // ============================================================================
 125 // implementation
 126 // ============================================================================
 127
 128 #if wxUSE_TTM_WINDOWFROMPOINT
 129
 130 // ----------------------------------------------------------------------------
 131 // window proc for our tooltip control
 132 // ----------------------------------------------------------------------------
 133
 134 LRESULT APIENTRY wxToolTipWndProc(HWND hwndTT,
 135                                   UINT msg,
 136                                   WPARAM wParam,
 137                                   LPARAM lParam)
 138 {
 139     if ( msg == TTM_WINDOWFROMPOINT )
 140     {
 141         LPPOINT ppt = (LPPOINT)lParam;
 142
 143         // the window on which event occurred
 144         HWND hwnd = ::WindowFromPoint(*ppt);
 145
 146         OutputDebugString("TTM_WINDOWFROMPOINT: ");
 147         OutputDebugString(wxString::Format("0x%08x => ", hwnd));
 148
 149         // return a HWND corresponding to a wxWindow because only wxWidgets are
 150         // associated with tooltips using TTM_ADDTOOL
 151         wxWindow *win = wxGetWindowFromHWND((WXHWND)hwnd);
 152
 153         if ( win )
 154         {
 155             hwnd = GetHwndOf(win);
 156             OutputDebugString(wxString::Format("0x%08x\r\n", hwnd));
 157
 158 #if 0
 159             // modify the point too!
 160             RECT rect;
 161             GetWindowRect(hwnd, &rect);
 162
 163             ppt->x = (rect.right - rect.left) / 2;
 164             ppt->y = (rect.bottom - rect.top) / 2;
 165 #endif // 0
 166             return (LRESULT)hwnd;
 167         }
 168         else
 169         {
 170             OutputDebugString("no window\r\n");
 171         }
 172     }
 173
 174     return ::CallWindowProc(CASTWNDPROC gs_wndprocToolTip, hwndTT, msg, wParam, lParam);
 175 }
 176
 177 #endif // wxUSE_TTM_WINDOWFROMPOINT
 178
 179 // ----------------------------------------------------------------------------
 180 // static functions
 181 // ----------------------------------------------------------------------------
 182
 183 void wxToolTip::Enable(bool flag)
 184 {
 185     SendTooltipMessageToAll(ms_hwndTT, TTM_ACTIVATE, flag, 0);
 186 }
 187
 188 void wxToolTip::SetDelay(long milliseconds)
 189 {
 190     SendTooltipMessageToAll(ms_hwndTT, TTM_SETDELAYTIME,
 191                             TTDT_INITIAL, milliseconds);
 192 }
 193
 194 // ---------------------------------------------------------------------------
 195 // implementation helpers
 196 // ---------------------------------------------------------------------------
 197
 198 // create the tooltip ctrl for our parent frame if it doesn't exist yet
 199 /* static */
 200 WXHWND wxToolTip::GetToolTipCtrl()
 201 {
 202     if ( !ms_hwndTT )
 203     {
 204         WXDWORD exflags = 0;
 205         if ( wxTheApp->GetLayoutDirection() == wxLayout_RightToLeft )
 206         {
 207             exflags |= WS_EX_LAYOUTRTL;
 208         }
 209
 210         // we want to show the tooltips always (even when the window is not
 211         // active) and we don't want to strip "&"s from them
 212         ms_hwndTT = (WXHWND)::CreateWindowEx(exflags,
 213                                              TOOLTIPS_CLASS,
 214                                              (LPCTSTR)NULL,
 215                                              TTS_ALWAYSTIP | TTS_NOPREFIX,
 216                                              CW_USEDEFAULT, CW_USEDEFAULT,
 217                                              CW_USEDEFAULT, CW_USEDEFAULT,
 218                                              NULL, (HMENU)NULL,
 219                                              wxGetInstance(),
 220                                              NULL);
 221        if ( ms_hwndTT )
 222        {
 223            HWND hwnd = (HWND)ms_hwndTT;
 224            SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0,
 225                         SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
 226
 227 #if wxUSE_TTM_WINDOWFROMPOINT
 228            // subclass the newly created control
 229            gs_wndprocToolTip = wxSetWindowProc(hwnd, wxToolTipWndProc);
 230 #endif // wxUSE_TTM_WINDOWFROMPOINT
 231        }
 232     }
 233
 234     return ms_hwndTT;
 235 }
 236
 237 /* static */
 238 void wxToolTip::RelayEvent(WXMSG *msg)
 239 {
 240     (void)SendTooltipMessage(GetToolTipCtrl(), TTM_RELAYEVENT, msg);
 241 }
 242
 243 // ----------------------------------------------------------------------------
 244 // ctor & dtor
 245 // ----------------------------------------------------------------------------
 246
 247 IMPLEMENT_ABSTRACT_CLASS(wxToolTip, wxObject)
 248
 249 wxToolTip::wxToolTip(const wxString &tip)
 250          : m_text(tip)
 251 {
 252     m_window = NULL;
 253 }
 254
 255 wxToolTip::~wxToolTip()
 256 {
 257     // the tooltip has to be removed before deleting. Otherwise, if it is visible
 258     // while being deleted, there will be a delay before it goes away.
 259     Remove();
 260 }
 261
 262 // ----------------------------------------------------------------------------
 263 // others
 264 // ----------------------------------------------------------------------------
 265
 266 void wxToolTip::Remove(WXHWND hWnd)
 267 {
 268     wxToolInfo ti((HWND)hWnd);
 269     (void)SendTooltipMessage(GetToolTipCtrl(), TTM_DELTOOL, &ti);
 270 }
 271
 272 void wxToolTip::Remove()
 273 {
 274     // remove this tool from the tooltip control
 275     if ( m_window )
 276     {
 277         Remove(m_window->GetHWND());
 278     }
 279 }
 280
 281 void wxToolTip::Add(WXHWND hWnd)
 282 {
 283     HWND hwnd = (HWND)hWnd;
 284
 285     wxToolInfo ti(hwnd);
 286
 287     // another possibility would be to specify LPSTR_TEXTCALLBACK here as we
 288     // store the tooltip text ourselves anyhow, and provide it in response to
 289     // TTN_NEEDTEXT (sent via WM_NOTIFY), but then we would be limited to 79
 290     // character tooltips as this is the size of the szText buffer in
 291     // NMTTDISPINFO struct -- and setting the tooltip here we can have tooltips
 292     // of any length
 293     ti.hwnd = hwnd;
 294     ti.lpszText = (wxChar *)m_text.wx_str(); // const_cast
 295
 296     if ( !SendTooltipMessage(GetToolTipCtrl(), TTM_ADDTOOL, &ti) )
 297     {
 298         wxLogDebug(_T("Failed to create the tooltip '%s'"), m_text.c_str());
 299     }
 300     else
 301     {
 302         // check for multiline toopltip
 303         int index = m_text.Find(_T('\n'));
 304
 305         if ( index != wxNOT_FOUND )
 306         {
 307 #ifdef TTM_SETMAXTIPWIDTH
 308             if ( wxApp::GetComCtl32Version() >= 470 )
 309             {
 310                 // use TTM_SETMAXTIPWIDTH to make tooltip multiline using the
 311                 // extent of its first line as max value
 312                 HFONT hfont = (HFONT)
 313                     SendTooltipMessage(GetToolTipCtrl(), WM_GETFONT, 0);
 314
 315                 if ( !hfont )
 316                 {
 317                     hfont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
 318                     if ( !hfont )
 319                     {
 320                         wxLogLastError(wxT("GetStockObject(DEFAULT_GUI_FONT)"));
 321                     }
 322                 }
 323
 324                 MemoryHDC hdc;
 325                 if ( !hdc )
 326                 {
 327                     wxLogLastError(wxT("CreateCompatibleDC(NULL)"));
 328                 }
 329
 330                 if ( !SelectObject(hdc, hfont) )
 331                 {
 332                     wxLogLastError(wxT("SelectObject(hfont)"));
 333                 }
 334
 335                 // find the width of the widest line
 336                 int max = 0;
 337                 wxStringTokenizer tokenizer(m_text, _T("\n"));
 338                 wxString token = tokenizer.GetNextToken();
 339                 while (token.length())
 340                 {
 341                     SIZE sz;
 342                     if ( !::GetTextExtentPoint32(hdc, token, token.length(), &sz) )
 343                     {
 344                         wxLogLastError(wxT("GetTextExtentPoint32"));
 345                     }
 346                     if ( sz.cx > max )
 347                         max = sz.cx;
 348
 349                     token = tokenizer.GetNextToken();
 350                 }
 351
 352                 // only set a new width if it is bigger than the current setting
 353                 if (max > SendTooltipMessage(GetToolTipCtrl(), TTM_GETMAXTIPWIDTH, 0))
 354                     SendTooltipMessage(GetToolTipCtrl(), TTM_SETMAXTIPWIDTH,
 355                                        (void *)max);
 356             }
 357             else
 358 #endif // comctl32.dll >= 4.70
 359             {
 360                 // replace the '\n's with spaces because otherwise they appear as
 361                 // unprintable characters in the tooltip string
 362                 m_text.Replace(_T("\n"), _T(" "));
 363                 ti.lpszText = (wxChar *)m_text.wx_str(); // const_cast
 364
 365                 if ( !SendTooltipMessage(GetToolTipCtrl(), TTM_ADDTOOL, &ti) )
 366                 {
 367                     wxLogDebug(_T("Failed to create the tooltip '%s'"), m_text.c_str());
 368                 }
 369             }
 370         }
 371     }
 372 }
 373
 374 void wxToolTip::SetWindow(wxWindow *win)
 375 {
 376     Remove();
 377
 378     m_window = win;
 379
 380     // add the window itself
 381     if ( m_window )
 382     {
 383         Add(m_window->GetHWND());
 384     }
 385 #if !defined(__WXUNIVERSAL__)
 386     // and all of its subcontrols (e.g. radiobuttons in a radiobox) as well
 387     wxControl *control = wxDynamicCast(m_window, wxControl);
 388     if ( control )
 389     {
 390         const wxArrayLong& subcontrols = control->GetSubcontrols();
 391         size_t count = subcontrols.GetCount();
 392         for ( size_t n = 0; n < count; n++ )
 393         {
 394             int id = subcontrols[n];
 395             HWND hwnd = GetDlgItem(GetHwndOf(m_window), id);
 396             if ( !hwnd )
 397             {
 398                 // may be it's a child of parent of the control, in fact?
 399                 // (radiobuttons are subcontrols, i.e. children of the radiobox
 400                 // for wxWidgets but are its siblings at Windows level)
 401                 hwnd = GetDlgItem(GetHwndOf(m_window->GetParent()), id);
 402             }
 403
 404             // must have it by now!
 405             wxASSERT_MSG( hwnd, _T("no hwnd for subcontrol?") );
 406
 407             Add((WXHWND)hwnd);
 408         }
 409     }
 410
 411     // VZ: it's ugly to do it here, but I don't want any major changes right
 412     //     now, later we will probably want to have wxWindow::OnGotToolTip() or
 413     //     something like this where the derived class can do such things
 414     //     itself instead of wxToolTip "knowing" about them all
 415     wxComboBox *combo = wxDynamicCast(control, wxComboBox);
 416     if ( combo )
 417     {
 418         WXHWND hwndComboEdit = combo->GetWindowStyle() & wxCB_READONLY
 419                                 ? combo->GetHWND()
 420                                 : combo->GetEditHWND();
 421         if ( hwndComboEdit )
 422         {
 423             Add(hwndComboEdit);
 424         }
 425     }
 426 #endif // !defined(__WXUNIVERSAL__)
 427 }
 428
 429 void wxToolTip::SetTip(const wxString& tip)
 430 {
 431     m_text = tip;
 432
 433     if ( m_window )
 434     {
 435         // update the tip text shown by the control
 436         wxToolInfo ti(GetHwndOf(m_window));
 437         ti.lpszText = (wxChar *)m_text.wx_str();
 438
 439         (void)SendTooltipMessage(GetToolTipCtrl(), TTM_UPDATETIPTEXT, &ti);
 440     }
 441 }
 442
 443 #endif // wxUSE_TOOLTIPS