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.c_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 wxTaskBarIcon::RemoveIcon()
 193 {
 194     if (!m_iconAdded)
 195         return false;
 196
 197     m_iconAdded = false;
 198
 199     NotifyIconData notifyData(GetHwndOf(m_win));
 200
 201     return wxShellNotifyIcon(NIM_DELETE, &notifyData) != 0;
 202 }
 203
 204 #if wxUSE_MENUS
 205 bool wxTaskBarIcon::PopupMenu(wxMenu *menu)
 206 {
 207     wxASSERT_MSG( m_win != NULL, _T("taskbar icon not initialized") );
 208
 209     static bool s_inPopup = false;
 210
 211     if (s_inPopup)
 212         return false;
 213
 214     s_inPopup = true;
 215
 216     int         x, y;
 217     wxGetMousePosition(&x, &y);
 218
 219     m_win->Move(x, y);
 220
 221     m_win->PushEventHandler(this);
 222
 223     menu->UpdateUI();
 224
 225     // the SetForegroundWindow() and PostMessage() calls are needed to work
 226     // around Win32 bug with the popup menus shown for the notifications as
 227     // documented at http://support.microsoft.com/kb/q135788/
 228     ::SetForegroundWindow(GetHwndOf(m_win));
 229
 230     bool rval = m_win->PopupMenu(menu, 0, 0);
 231
 232     ::PostMessage(GetHwndOf(m_win), WM_NULL, 0, 0L);
 233
 234     m_win->PopEventHandler(false);
 235
 236     s_inPopup = false;
 237
 238     return rval;
 239 }
 240 #endif // wxUSE_MENUS
 241
 242 void wxTaskBarIcon::RegisterWindowMessages()
 243 {
 244     static bool s_registered = false;
 245
 246     if ( !s_registered )
 247     {
 248         // Taskbar restart msg will be sent to us if the icon needs to be redrawn
 249         gs_msgRestartTaskbar = RegisterWindowMessage(wxT("TaskbarCreated"));
 250
 251         // Also register the taskbar message here
 252         gs_msgTaskbar = ::RegisterWindowMessage(wxT("wxTaskBarIconMessage"));
 253
 254         s_registered = true;
 255     }
 256 }
 257
 258 // ----------------------------------------------------------------------------
 259 // wxTaskBarIcon window proc
 260 // ----------------------------------------------------------------------------
 261
 262 long wxTaskBarIcon::WindowProc(unsigned int msg,
 263                                unsigned int WXUNUSED(wParam),
 264                                long lParam)
 265 {
 266     wxEventType eventType = 0;
 267
 268     if (msg == gs_msgRestartTaskbar)   // does the icon need to be redrawn?
 269     {
 270         m_iconAdded = false;
 271         SetIcon(m_icon, m_strTooltip);
 272         return 0;
 273     }
 274
 275     // this function should only be called for gs_msg(Restart)Taskbar messages
 276     wxASSERT(msg == gs_msgTaskbar);
 277
 278     switch (lParam)
 279     {
 280         case WM_LBUTTONDOWN:
 281             eventType = wxEVT_TASKBAR_LEFT_DOWN;
 282             break;
 283
 284         case WM_LBUTTONUP:
 285             eventType = wxEVT_TASKBAR_LEFT_UP;
 286             break;
 287
 288         case WM_RBUTTONDOWN:
 289             eventType = wxEVT_TASKBAR_RIGHT_DOWN;
 290             break;
 291
 292         case WM_RBUTTONUP:
 293             eventType = wxEVT_TASKBAR_RIGHT_UP;
 294             break;
 295
 296         case WM_LBUTTONDBLCLK:
 297             eventType = wxEVT_TASKBAR_LEFT_DCLICK;
 298             break;
 299
 300         case WM_RBUTTONDBLCLK:
 301             eventType = wxEVT_TASKBAR_RIGHT_DCLICK;
 302             break;
 303
 304         case WM_MOUSEMOVE:
 305             eventType = wxEVT_TASKBAR_MOVE;
 306             break;
 307
 308         default:
 309             break;
 310     }
 311
 312     if (eventType)
 313     {
 314         wxTaskBarIconEvent event(eventType, this);
 315
 316         ProcessEvent(event);
 317     }
 318
 319     return 0;
 320 }
 321
 322 #endif // wxUSE_TASKBARICON
 323