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 #endif
  28
  29 #include "wx/msw/wrapshl.h"
  30
  31 #include <string.h>
  32 #include "wx/taskbar.h"
  33 #include "wx/dynlib.h"
  34
  35 // initialized on demand
  36 static UINT gs_msgTaskbar = 0;
  37 static UINT gs_msgRestartTaskbar = 0;
  38
  39
  40 IMPLEMENT_DYNAMIC_CLASS(wxTaskBarIcon, wxEvtHandler)
  41
  42 // ============================================================================
  43 // implementation
  44 // ============================================================================
  45
  46 // wrapper around Shell_NotifyIcon(): this function is not present in Win95
  47 // shell32.dll so load it dynamically to allow programs using wxTaskBarIcon to
  48 // start under this OS
  49 static BOOL wxShellNotifyIcon(DWORD dwMessage, NOTIFYICONDATA *pData)
  50 {
  51 #if wxUSE_DYNLIB_CLASS
  52     typedef BOOL (WINAPI *Shell_NotifyIcon_t)(DWORD, NOTIFYICONDATA *);
  53
  54     static Shell_NotifyIcon_t s_pfnShell_NotifyIcon = NULL;
  55     static bool s_initialized = false;
  56     if ( !s_initialized )
  57     {
  58         s_initialized = true;
  59
  60         wxLogNull noLog;
  61         wxDynamicLibrary dllShell("shell32.dll");
  62         if ( dllShell.IsLoaded() )
  63         {
  64             wxDL_INIT_FUNC_AW(s_pfn, Shell_NotifyIcon, dllShell);
  65         }
  66
  67         // NB: it's ok to destroy dllShell here, we link to shell32.dll
  68         //     implicitly so it won't be unloaded
  69     }
  70
  71     return s_pfnShell_NotifyIcon ? (*s_pfnShell_NotifyIcon)(dwMessage, pData)
  72                                  : FALSE;
  73 #else // !wxUSE_DYNLIB_CLASS
  74     return Shell_NotifyIcon(dwMessage, pData);
  75 #endif // wxUSE_DYNLIB_CLASS/!wxUSE_DYNLIB_CLASS
  76 }
  77
  78 // ----------------------------------------------------------------------------
  79 // wxTaskBarIconWindow: helper window
  80 // ----------------------------------------------------------------------------
  81
  82 // NB: this class serves two purposes:
  83 //     1. win32 needs a HWND associated with taskbar icon, this provides it
  84 //     2. we need wxTopLevelWindow so that the app doesn't exit when
  85 //        last frame is closed but there still is a taskbar icon
  86 class wxTaskBarIconWindow : public wxFrame
  87 {
  88 public:
  89     wxTaskBarIconWindow(wxTaskBarIcon *icon)
  90         : wxFrame(NULL, wxID_ANY, wxEmptyString, wxDefaultPosition, wxDefaultSize, 0),
  91           m_icon(icon)
  92     {
  93     }
  94
  95     WXLRESULT MSWWindowProc(WXUINT msg,
  96                             WXWPARAM wParam, WXLPARAM lParam)
  97     {
  98         if (msg == gs_msgRestartTaskbar || msg == gs_msgTaskbar)
  99         {
 100             return m_icon->WindowProc(msg, wParam, lParam);
 101         }
 102         else
 103         {
 104             return wxFrame::MSWWindowProc(msg, wParam, lParam);
 105         }
 106     }
 107
 108 private:
 109     wxTaskBarIcon *m_icon;
 110 };
 111
 112
 113 // ----------------------------------------------------------------------------
 114 // NotifyIconData: wrapper around NOTIFYICONDATA
 115 // ----------------------------------------------------------------------------
 116
 117 struct NotifyIconData : public NOTIFYICONDATA
 118 {
 119     NotifyIconData(WXHWND hwnd)
 120     {
 121         memset(this, 0, sizeof(NOTIFYICONDATA));
 122         cbSize = sizeof(NOTIFYICONDATA);
 123         hWnd = (HWND) hwnd;
 124         uCallbackMessage = gs_msgTaskbar;
 125         uFlags = NIF_MESSAGE;
 126
 127         // we use the same id for all taskbar icons as we don't need it to
 128         // distinguish between them
 129         uID = 99;
 130     }
 131 };
 132
 133 // ----------------------------------------------------------------------------
 134 // wxTaskBarIcon
 135 // ----------------------------------------------------------------------------
 136
 137 wxTaskBarIcon::wxTaskBarIcon()
 138 {
 139     m_win = NULL;
 140     m_iconAdded = false;
 141     RegisterWindowMessages();
 142 }
 143
 144 wxTaskBarIcon::~wxTaskBarIcon()
 145 {
 146     if (m_iconAdded)
 147         RemoveIcon();
 148
 149     if (m_win)
 150         m_win->Destroy();
 151 }
 152
 153 // Operations
 154 bool wxTaskBarIcon::SetIcon(const wxIcon& icon, const wxString& tooltip)
 155 {
 156     // NB: we have to create the window lazily because of backward compatibility,
 157     //     old applications may create a wxTaskBarIcon instance before wxApp
 158     //     is initialized (as samples/taskbar used to do)
 159     if (!m_win)
 160     {
 161         m_win = new wxTaskBarIconWindow(this);
 162     }
 163
 164     m_icon = icon;
 165     m_strTooltip = tooltip;
 166
 167     NotifyIconData notifyData(GetHwndOf(m_win));
 168
 169     if (icon.Ok())
 170     {
 171         notifyData.uFlags |= NIF_ICON;
 172         notifyData.hIcon = GetHiconOf(icon);
 173     }
 174
 175     // set NIF_TIP even for an empty tooltip: otherwise it would be impossible
 176     // to remove an existing tooltip using this function
 177     notifyData.uFlags |= NIF_TIP;
 178     if ( !tooltip.empty() )
 179     {
 180         wxStrncpy(notifyData.szTip, tooltip.wx_str(), WXSIZEOF(notifyData.szTip));
 181     }
 182
 183     bool ok = wxShellNotifyIcon(m_iconAdded ? NIM_MODIFY
 184                                             : NIM_ADD, &notifyData) != 0;
 185
 186     if ( !m_iconAdded && ok )
 187         m_iconAdded = true;
 188
 189     return ok;
 190 }
 191
 192 bool
 193 wxTaskBarIcon::ShowBalloon(const wxString& title,
 194                            const wxString& text,
 195                            unsigned msec,
 196                            int flags)
 197 {
 198     wxCHECK_MSG( m_iconAdded, false,
 199                     _T("can't be used before the icon is created") );
 200
 201     NotifyIconData notifyData(GetHwndOf(m_win));
 202     notifyData.uFlags |= NIF_INFO;
 203     notifyData.uTimeout = msec;
 204     wxStrncpy(notifyData.szInfo, text.wx_str(), WXSIZEOF(notifyData.szInfo));
 205     wxStrncpy(notifyData.szInfoTitle, title.wx_str(),
 206                 WXSIZEOF(notifyData.szInfoTitle));
 207
 208     if ( flags & wxICON_INFORMATION )
 209         notifyData.dwInfoFlags |= NIIF_INFO;
 210     else if ( flags & wxICON_WARNING )
 211         notifyData.dwInfoFlags |= NIIF_WARNING;
 212     else if ( flags & wxICON_ERROR )
 213         notifyData.dwInfoFlags |= NIIF_ERROR;
 214
 215     return wxShellNotifyIcon(NIM_MODIFY, &notifyData) != 0;
 216 }
 217
 218 bool wxTaskBarIcon::RemoveIcon()
 219 {
 220     if (!m_iconAdded)
 221         return false;
 222
 223     m_iconAdded = false;
 224
 225     NotifyIconData notifyData(GetHwndOf(m_win));
 226
 227     return wxShellNotifyIcon(NIM_DELETE, &notifyData) != 0;
 228 }
 229
 230 #if wxUSE_MENUS
 231 bool wxTaskBarIcon::PopupMenu(wxMenu *menu)
 232 {
 233     wxASSERT_MSG( m_win != NULL, _T("taskbar icon not initialized") );
 234
 235     static bool s_inPopup = false;
 236
 237     if (s_inPopup)
 238         return false;
 239
 240     s_inPopup = true;
 241
 242     int         x, y;
 243     wxGetMousePosition(&x, &y);
 244
 245     m_win->Move(x, y);
 246
 247     m_win->PushEventHandler(this);
 248
 249     menu->UpdateUI();
 250
 251     // the SetForegroundWindow() and PostMessage() calls are needed to work
 252     // around Win32 bug with the popup menus shown for the notifications as
 253     // documented at http://support.microsoft.com/kb/q135788/
 254     ::SetForegroundWindow(GetHwndOf(m_win));
 255
 256     bool rval = m_win->PopupMenu(menu, 0, 0);
 257
 258     ::PostMessage(GetHwndOf(m_win), WM_NULL, 0, 0L);
 259
 260     m_win->PopEventHandler(false);
 261
 262     s_inPopup = false;
 263
 264     return rval;
 265 }
 266 #endif // wxUSE_MENUS
 267
 268 void wxTaskBarIcon::RegisterWindowMessages()
 269 {
 270     static bool s_registered = false;
 271
 272     if ( !s_registered )
 273     {
 274         // Taskbar restart msg will be sent to us if the icon needs to be redrawn
 275         gs_msgRestartTaskbar = RegisterWindowMessage(wxT("TaskbarCreated"));
 276
 277         // Also register the taskbar message here
 278         gs_msgTaskbar = ::RegisterWindowMessage(wxT("wxTaskBarIconMessage"));
 279
 280         s_registered = true;
 281     }
 282 }
 283
 284 // ----------------------------------------------------------------------------
 285 // wxTaskBarIcon window proc
 286 // ----------------------------------------------------------------------------
 287
 288 long wxTaskBarIcon::WindowProc(unsigned int msg,
 289                                unsigned int WXUNUSED(wParam),
 290                                long lParam)
 291 {
 292     wxEventType eventType = 0;
 293
 294     if (msg == gs_msgRestartTaskbar)   // does the icon need to be redrawn?
 295     {
 296         m_iconAdded = false;
 297         SetIcon(m_icon, m_strTooltip);
 298         return 0;
 299     }
 300
 301     // this function should only be called for gs_msg(Restart)Taskbar messages
 302     wxASSERT(msg == gs_msgTaskbar);
 303
 304     switch (lParam)
 305     {
 306         case WM_LBUTTONDOWN:
 307             eventType = wxEVT_TASKBAR_LEFT_DOWN;
 308             break;
 309
 310         case WM_LBUTTONUP:
 311             eventType = wxEVT_TASKBAR_LEFT_UP;
 312             break;
 313
 314         case WM_RBUTTONDOWN:
 315             eventType = wxEVT_TASKBAR_RIGHT_DOWN;
 316             break;
 317
 318         case WM_RBUTTONUP:
 319             eventType = wxEVT_TASKBAR_RIGHT_UP;
 320             break;
 321
 322         case WM_LBUTTONDBLCLK:
 323             eventType = wxEVT_TASKBAR_LEFT_DCLICK;
 324             break;
 325
 326         case WM_RBUTTONDBLCLK:
 327             eventType = wxEVT_TASKBAR_RIGHT_DCLICK;
 328             break;
 329
 330         case WM_MOUSEMOVE:
 331             eventType = wxEVT_TASKBAR_MOVE;
 332             break;
 333
 334         default:
 335             break;
 336     }
 337
 338     if (eventType)
 339     {
 340         wxTaskBarIconEvent event(eventType, this);
 341
 342         ProcessEvent(event);
 343     }
 344
 345     return 0;
 346 }
 347
 348 #endif // wxUSE_TASKBARICON
 349