src/msw/taskbar.cpp

   1 /////////////////////////////////////////////////////////////////////////
   2 // File:        src/msw/taskbar.cpp
   3 // Purpose:     Implements wxTaskBarIcon class for manipulating icons on
   4 //              the Windows task bar.
   5 // Author:      Julian Smart
   6 // Modified by: Vaclav Slavik
   7 // Created:     24/3/98
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c)
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////
  12
  13 // For compilers that support precompilation, includes "wx.h".
  14 #include "wx/wxprec.h"
  15
  16 #ifdef __BORLANDC__
  17     #pragma hdrstop
  18 #endif
  19
  20 #if wxUSE_TASKBARICON
  21
  22 #ifndef WX_PRECOMP
  23     #include "wx/window.h"
  24     #include "wx/frame.h"
  25     #include "wx/utils.h"
  26     #include "wx/menu.h"
  27     #include "wx/app.h"
  28 #endif
  29
  30 #include "wx/msw/wrapshl.h"
  31
  32 #include <string.h>
  33 #include "wx/taskbar.h"
  34 #include "wx/msw/private.h"
  35 #include "wx/dynlib.h"
  36
  37 #ifndef NIN_BALLOONTIMEOUT
  38     #define NIN_BALLOONTIMEOUT      0x0404
  39     #define NIN_BALLOONUSERCLICK    0x0405
  40 #endif
  41
  42 #ifndef NIM_SETVERSION
  43     #define NIM_SETVERSION  0x00000004
  44 #endif
  45
  46 #ifndef NIF_INFO
  47     #define NIF_INFO        0x00000010
  48 #endif
  49
  50 #ifndef NOTIFYICONDATA_V1_SIZE
  51     #ifdef UNICODE
  52         #define NOTIFYICONDATA_V1_SIZE 0x0098
  53     #else
  54         #define NOTIFYICONDATA_V1_SIZE 0x0058
  55     #endif
  56 #endif
  57
  58 #ifndef NOTIFYICONDATA_V2_SIZE
  59     #ifdef UNICODE
  60         #define NOTIFYICONDATA_V2_SIZE 0x03A8
  61     #else
  62         #define NOTIFYICONDATA_V2_SIZE 0x01E8
  63     #endif
  64 #endif
  65
  66 // initialized on demand
  67 static UINT gs_msgTaskbar = 0;
  68 static UINT gs_msgRestartTaskbar = 0;
  69
  70
  71 IMPLEMENT_DYNAMIC_CLASS(wxTaskBarIcon, wxEvtHandler)
  72
  73 // ============================================================================
  74 // implementation
  75 // ============================================================================
  76
  77 // wrapper around Shell_NotifyIcon(): this function is not present in Win95
  78 // shell32.dll so load it dynamically to allow programs using wxTaskBarIcon to
  79 // start under this OS
  80 static BOOL wxShellNotifyIcon(DWORD dwMessage, NOTIFYICONDATA *pData)
  81 {
  82 #if wxUSE_DYNLIB_CLASS
  83     typedef BOOL (WINAPI *Shell_NotifyIcon_t)(DWORD, NOTIFYICONDATA *);
  84
  85     static Shell_NotifyIcon_t s_pfnShell_NotifyIcon = NULL;
  86     static bool s_initialized = false;
  87     if ( !s_initialized )
  88     {
  89         s_initialized = true;
  90
  91         wxLogNull noLog;
  92         wxDynamicLibrary dllShell("shell32.dll");
  93         if ( dllShell.IsLoaded() )
  94         {
  95             wxDL_INIT_FUNC_AW(s_pfn, Shell_NotifyIcon, dllShell);
  96         }
  97
  98         // NB: it's ok to destroy dllShell here, we link to shell32.dll
  99         //     implicitly so it won't be unloaded
 100     }
 101
 102     return s_pfnShell_NotifyIcon ? (*s_pfnShell_NotifyIcon)(dwMessage, pData)
 103                                  : FALSE;
 104 #else // !wxUSE_DYNLIB_CLASS
 105     return Shell_NotifyIcon(dwMessage, pData);
 106 #endif // wxUSE_DYNLIB_CLASS/!wxUSE_DYNLIB_CLASS
 107 }
 108
 109 // ----------------------------------------------------------------------------
 110 // wxTaskBarIconWindow: helper window
 111 // ----------------------------------------------------------------------------
 112
 113 // NB: this class serves two purposes:
 114 //     1. win32 needs a HWND associated with taskbar icon, this provides it
 115 //     2. we need wxTopLevelWindow so that the app doesn't exit when
 116 //        last frame is closed but there still is a taskbar icon
 117 class wxTaskBarIconWindow : public wxFrame
 118 {
 119 public:
 120     wxTaskBarIconWindow(wxTaskBarIcon *icon)
 121         : wxFrame(NULL, wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, 0),
 122           m_icon(icon)
 123     {
 124     }
 125
 126     WXLRESULT MSWWindowProc(WXUINT msg,
 127                             WXWPARAM wParam, WXLPARAM lParam)
 128     {
 129         if (msg == gs_msgRestartTaskbar || msg == gs_msgTaskbar)
 130         {
 131             return m_icon->WindowProc(msg, wParam, lParam);
 132         }
 133         else
 134         {
 135             return wxFrame::MSWWindowProc(msg, wParam, lParam);
 136         }
 137     }
 138
 139 private:
 140     wxTaskBarIcon *m_icon;
 141 };
 142
 143
 144 // ----------------------------------------------------------------------------
 145 // NotifyIconData: wrapper around NOTIFYICONDATA
 146 // ----------------------------------------------------------------------------
 147
 148 struct NotifyIconData : public NOTIFYICONDATA
 149 {
 150     NotifyIconData(WXHWND hwnd)
 151     {
 152         memset(this, 0, sizeof(NOTIFYICONDATA));
 153
 154         // Do _not_ use sizeof(NOTIFYICONDATA) here, it may be too big if we're
 155         // compiled with newer headers but running on an older system and while
 156         // we could do complicated tests for the exact system version it's
 157         // easier to just use an old size which should be supported everywhere
 158         // from Windows 2000 up and which is all we need as we don't use any
 159         // newer features so far. But if we're running under a really ancient
 160         // system (Win9x), fall back to even smaller size -- then the balloon
 161         // related features won't be available but the rest will still work.
 162         cbSize = wxTheApp->GetShell32Version() >= 500
 163                     ? NOTIFYICONDATA_V2_SIZE
 164                     : NOTIFYICONDATA_V1_SIZE;
 165
 166         hWnd = (HWND) hwnd;
 167         uCallbackMessage = gs_msgTaskbar;
 168         uFlags = NIF_MESSAGE;
 169
 170         // we use the same id for all taskbar icons as we don't need it to
 171         // distinguish between them
 172         uID = 99;
 173     }
 174 };
 175
 176 // ----------------------------------------------------------------------------
 177 // wxTaskBarIcon
 178 // ----------------------------------------------------------------------------
 179
 180 wxTaskBarIcon::wxTaskBarIcon(wxTaskBarIconType WXUNUSED(iconType))
 181 {
 182     m_win = NULL;
 183     m_iconAdded = false;
 184     RegisterWindowMessages();
 185 }
 186
 187 wxTaskBarIcon::~wxTaskBarIcon()
 188 {
 189     if ( m_iconAdded )
 190         RemoveIcon();
 191
 192     if ( m_win )
 193     {
 194         // we must use delete and not Destroy() here because the latter will
 195         // only schedule the window to be deleted during the next idle event
 196         // processing but we may not get any idle events if there are no other
 197         // windows left in the program
 198         delete m_win;
 199     }
 200 }
 201
 202 // Operations
 203 bool wxTaskBarIcon::SetIcon(const wxIcon& icon, const wxString& tooltip)
 204 {
 205     // NB: we have to create the window lazily because of backward compatibility,
 206     //     old applications may create a wxTaskBarIcon instance before wxApp
 207     //     is initialized (as samples/taskbar used to do)
 208     if (!m_win)
 209     {
 210         m_win = new wxTaskBarIconWindow(this);
 211     }
 212
 213     m_icon = icon;
 214     m_strTooltip = tooltip;
 215
 216     NotifyIconData notifyData(GetHwndOf(m_win));
 217
 218     if (icon.IsOk())
 219     {
 220         notifyData.uFlags |= NIF_ICON;
 221         notifyData.hIcon = GetHiconOf(icon);
 222     }
 223
 224     // set NIF_TIP even for an empty tooltip: otherwise it would be impossible
 225     // to remove an existing tooltip using this function
 226     notifyData.uFlags |= NIF_TIP;
 227     if ( !tooltip.empty() )
 228     {
 229         wxStrlcpy(notifyData.szTip, tooltip.t_str(), WXSIZEOF(notifyData.szTip));
 230     }
 231
 232     bool ok = wxShellNotifyIcon(m_iconAdded ? NIM_MODIFY
 233                                             : NIM_ADD, &notifyData) != 0;
 234
 235     if ( !ok )
 236     {
 237         wxLogLastError(wxT("wxShellNotifyIcon(NIM_MODIFY/ADD)"));
 238     }
 239
 240     if ( !m_iconAdded && ok )
 241         m_iconAdded = true;
 242
 243     return ok;
 244 }
 245
 246 #if wxUSE_TASKBARICON_BALLOONS
 247
 248 bool
 249 wxTaskBarIcon::ShowBalloon(const wxString& title,
 250                            const wxString& text,
 251                            unsigned msec,
 252                            int flags)
 253 {
 254     wxCHECK_MSG( m_iconAdded, false,
 255                     wxT("can't be used before the icon is created") );
 256
 257     const HWND hwnd = GetHwndOf(m_win);
 258
 259     // we need to enable version 5.0 behaviour to receive notifications about
 260     // the balloon disappearance
 261     NotifyIconData notifyData(hwnd);
 262     notifyData.uFlags = 0;
 263     notifyData.uVersion = 3 /* NOTIFYICON_VERSION for Windows 2000/XP */;
 264
 265     if ( !wxShellNotifyIcon(NIM_SETVERSION, &notifyData) )
 266     {
 267         wxLogLastError(wxT("wxShellNotifyIcon(NIM_SETVERSION)"));
 268     }
 269
 270     // do show the balloon now
 271     notifyData = NotifyIconData(hwnd);
 272     notifyData.uFlags |= NIF_INFO;
 273     notifyData.uTimeout = msec;
 274     wxStrlcpy(notifyData.szInfo, text.t_str(), WXSIZEOF(notifyData.szInfo));
 275     wxStrlcpy(notifyData.szInfoTitle, title.t_str(),
 276                 WXSIZEOF(notifyData.szInfoTitle));
 277
 278     if ( flags & wxICON_INFORMATION )
 279         notifyData.dwInfoFlags |= NIIF_INFO;
 280     else if ( flags & wxICON_WARNING )
 281         notifyData.dwInfoFlags |= NIIF_WARNING;
 282     else if ( flags & wxICON_ERROR )
 283         notifyData.dwInfoFlags |= NIIF_ERROR;
 284
 285     bool ok = wxShellNotifyIcon(NIM_MODIFY, &notifyData) != 0;
 286     if ( !ok )
 287     {
 288         wxLogLastError(wxT("wxShellNotifyIcon(NIM_MODIFY)"));
 289     }
 290
 291     return ok;
 292 }
 293
 294 #endif // wxUSE_TASKBARICON_BALLOONS
 295
 296 bool wxTaskBarIcon::RemoveIcon()
 297 {
 298     if (!m_iconAdded)
 299         return false;
 300
 301     m_iconAdded = false;
 302
 303     NotifyIconData notifyData(GetHwndOf(m_win));
 304
 305     bool ok = wxShellNotifyIcon(NIM_DELETE, &notifyData) != 0;
 306     if ( !ok )
 307     {
 308         wxLogLastError(wxT("wxShellNotifyIcon(NIM_DELETE)"));
 309     }
 310
 311     return ok;
 312 }
 313
 314 #if wxUSE_MENUS
 315 bool wxTaskBarIcon::PopupMenu(wxMenu *menu)
 316 {
 317     wxASSERT_MSG( m_win != NULL, wxT("taskbar icon not initialized") );
 318
 319     static bool s_inPopup = false;
 320
 321     if (s_inPopup)
 322         return false;
 323
 324     s_inPopup = true;
 325
 326     int         x, y;
 327     wxGetMousePosition(&x, &y);
 328
 329     m_win->Move(x, y);
 330
 331     m_win->PushEventHandler(this);
 332
 333     menu->UpdateUI();
 334
 335     // the SetForegroundWindow() and PostMessage() calls are needed to work
 336     // around Win32 bug with the popup menus shown for the notifications as
 337     // documented at http://support.microsoft.com/kb/q135788/
 338     ::SetForegroundWindow(GetHwndOf(m_win));
 339
 340     bool rval = m_win->PopupMenu(menu, 0, 0);
 341
 342     ::PostMessage(GetHwndOf(m_win), WM_NULL, 0, 0L);
 343
 344     m_win->PopEventHandler(false);
 345
 346     s_inPopup = false;
 347
 348     return rval;
 349 }
 350 #endif // wxUSE_MENUS
 351
 352 void wxTaskBarIcon::RegisterWindowMessages()
 353 {
 354     static bool s_registered = false;
 355
 356     if ( !s_registered )
 357     {
 358         // Taskbar restart msg will be sent to us if the icon needs to be redrawn
 359         gs_msgRestartTaskbar = RegisterWindowMessage(wxT("TaskbarCreated"));
 360
 361         // Also register the taskbar message here
 362         gs_msgTaskbar = ::RegisterWindowMessage(wxT("wxTaskBarIconMessage"));
 363
 364         s_registered = true;
 365     }
 366 }
 367
 368 // ----------------------------------------------------------------------------
 369 // wxTaskBarIcon window proc
 370 // ----------------------------------------------------------------------------
 371
 372 long wxTaskBarIcon::WindowProc(unsigned int msg,
 373                                unsigned int WXUNUSED(wParam),
 374                                long lParam)
 375 {
 376     if ( msg == gs_msgRestartTaskbar )   // does the icon need to be redrawn?
 377     {
 378         m_iconAdded = false;
 379         SetIcon(m_icon, m_strTooltip);
 380         return 0;
 381     }
 382
 383     // this function should only be called for gs_msg(Restart)Taskbar messages
 384     wxASSERT( msg == gs_msgTaskbar );
 385
 386     wxEventType eventType = 0;
 387     switch ( lParam )
 388     {
 389         case WM_LBUTTONDOWN:
 390             eventType = wxEVT_TASKBAR_LEFT_DOWN;
 391             break;
 392
 393         case WM_LBUTTONUP:
 394             eventType = wxEVT_TASKBAR_LEFT_UP;
 395             break;
 396
 397         case WM_RBUTTONDOWN:
 398             eventType = wxEVT_TASKBAR_RIGHT_DOWN;
 399             break;
 400
 401         case WM_RBUTTONUP:
 402             eventType = wxEVT_TASKBAR_RIGHT_UP;
 403             break;
 404
 405         case WM_LBUTTONDBLCLK:
 406             eventType = wxEVT_TASKBAR_LEFT_DCLICK;
 407             break;
 408
 409         case WM_RBUTTONDBLCLK:
 410             eventType = wxEVT_TASKBAR_RIGHT_DCLICK;
 411             break;
 412
 413         case WM_MOUSEMOVE:
 414             eventType = wxEVT_TASKBAR_MOVE;
 415             break;
 416
 417         case NIN_BALLOONTIMEOUT:
 418             eventType = wxEVT_TASKBAR_BALLOON_TIMEOUT;
 419             break;
 420
 421         case NIN_BALLOONUSERCLICK:
 422             eventType = wxEVT_TASKBAR_BALLOON_CLICK;
 423             break;
 424     }
 425
 426     if ( eventType )
 427     {
 428         wxTaskBarIconEvent event(eventType, this);
 429
 430         ProcessEvent(event);
 431     }
 432
 433     return 0;
 434 }
 435
 436 #endif // wxUSE_TASKBARICON
 437