Disable wxUSE_ENH_METAFILE for wxGTK builds.

[wxWidgets.git] / src / msw / notifmsg.cpp

diff --git a/src/msw/notifmsg.cpp b/src/msw/notifmsg.cpp
index 0b43293b4f87e2bb554e8b548858726375139379..9db2177dfa1d6781dd9064173d6b6673fe39ab15 100644 (file)
--- a/src/msw/notifmsg.cpp
+++ b/src/msw/notifmsg.cpp
@@ -92,9 +92,10 @@ private:
 class wxBalloonNotifMsgImpl : public wxNotifMsgImpl
 {
 public:
 class wxBalloonNotifMsgImpl : public wxNotifMsgImpl
 {
 public:

-    // ctor sets up m_icon (using the icon of the top level parent of the given
-    // window) which can be used to show an attached balloon later by the
-    // derived classes
+    // Ctor creates the associated taskbar icon (using the icon of the top
+    // level parent of the given window) unless UseTaskBarIcon() had been
+    // previously called  which can be used to show an attached balloon later
+    // by the derived classes.

     wxBalloonNotifMsgImpl(wxWindow *win) { SetUpIcon(win); }
 
     // implementation of wxNotificationMessage method with the same name
     wxBalloonNotifMsgImpl(wxWindow *win) { SetUpIcon(win); }
 
     // implementation of wxNotificationMessage method with the same name


@@ -105,20 +106,53 @@ public:
                         int timeout,
                         int flags);
 
                         int timeout,
                         int flags);
 

-protected:
-    // sets up m_icon (doesn't do anything with the old value, caller beware)
-    void SetUpIcon(wxWindow *win);

 
 

+    // Returns true if we're using our own icon or false if we're hitching a
+    // ride on the application icon provided to us via UseTaskBarIcon().
+    static bool IsUsingOwnIcon()
+    {
+        return ms_refCountIcon != -1;
+    }

 
 

-    static wxTaskBarIcon *ms_iconToUse;
+    // Indicates that the taskbar icon we're using has been hidden and can be
+    // deleted.
+    //
+    // This is only called by wxNotificationIconEvtHandler and should only be
+    // called when using our own icon (as opposed to the one passed to us via
+    // UseTaskBarIcon()).
+    static void ReleaseIcon()
+    {
+        wxASSERT_MSG( ms_refCountIcon != -1,
+                      wxS("Must not be called when not using own icon") );

 
 

-    // the icon we attach our notification to, either ms_iconToUse or a
-    // temporary one which we will destroy when done
-    wxTaskBarIcon *m_icon;
+        if ( !--ms_refCountIcon )
+        {
+            delete ms_icon;
+            ms_icon = NULL;
+        }
+    }

 
 

-    // should be only used if m_icon != NULL and indicates whether we should
-    // delete it
-    bool m_ownsIcon;
+protected:
+    // Creates a new icon if necessary, see the comment below.
+    void SetUpIcon(wxWindow *win);
+
+
+    // We need an icon to show the notification in a balloon attached to it.
+    // It may happen that the main application already shows an icon in the
+    // taskbar notification area in which case it should call our
+    // UseTaskBarIcon() and we just use this icon without ever allocating nor
+    // deleting it and ms_refCountIcon is -1 and never changes. Otherwise, we
+    // create the icon when we need it the first time but reuse it if we need
+    // to show subsequent notifications while this icon is still alive. This is
+    // needed in order to avoid 2 or 3 or even more identical icons if a couple
+    // of notifications are shown in a row (which happens quite easily in
+    // practice because Windows helpfully buffers all the notifications that
+    // were generated while the user was away -- i.e. the screensaver was
+    // active -- and then shows them all at once when the user comes back). In
+    // this case, ms_refCountIcon is used as a normal reference counter, i.e.
+    // the icon is only destroyed when it reaches 0.
+    static wxTaskBarIcon *ms_icon;
+    static int ms_refCountIcon;

 };
 
 // implementation for automatically hidden notifications
 };
 
 // implementation for automatically hidden notifications


@@ -212,7 +246,7 @@ wxNotificationIconEvtHandler::wxNotificationIconEvtHandler(wxTaskBarIcon *icon)
 
 void wxNotificationIconEvtHandler::OnIconHidden()
 {
 
 void wxNotificationIconEvtHandler::OnIconHidden()
 {

-    delete m_icon;
+    wxBalloonNotifMsgImpl::ReleaseIcon();

 
     delete this;
 }
 
     delete this;
 }


@@ -234,29 +268,36 @@ void wxNotificationIconEvtHandler::OnClick(wxTaskBarIconEvent& WXUNUSED(event))
 // wxBalloonNotifMsgImpl
 // ----------------------------------------------------------------------------
 
 // wxBalloonNotifMsgImpl
 // ----------------------------------------------------------------------------
 

-wxTaskBarIcon *wxBalloonNotifMsgImpl::ms_iconToUse = NULL;
+wxTaskBarIcon *wxBalloonNotifMsgImpl::ms_icon = NULL;
+int wxBalloonNotifMsgImpl::ms_refCountIcon = 0;

 
 /* static */
 wxTaskBarIcon *wxBalloonNotifMsgImpl::UseTaskBarIcon(wxTaskBarIcon *icon)
 {
 
 /* static */
 wxTaskBarIcon *wxBalloonNotifMsgImpl::UseTaskBarIcon(wxTaskBarIcon *icon)
 {

-    wxTaskBarIcon * const iconOld = ms_iconToUse;
-    ms_iconToUse = icon;
+    wxTaskBarIcon * const iconOld = ms_icon;
+    ms_icon = icon;
+
+    // Don't use reference counting for the provided icon, we don't own it.
+    ms_refCountIcon = icon ? -1 : 0;
+

     return iconOld;
 }
 
 void wxBalloonNotifMsgImpl::SetUpIcon(wxWindow *win)
 {
     return iconOld;
 }
 
 void wxBalloonNotifMsgImpl::SetUpIcon(wxWindow *win)
 {

-    if ( ms_iconToUse )
+    if ( ms_icon )

     {
     {

-        // use an existing icon
-        m_ownsIcon = false;
-        m_icon = ms_iconToUse;
+        // Increment the reference count if we manage the icon on our own.
+        if ( ms_refCountIcon != -1 )
+            ms_refCountIcon++;

     }
     }

-    else // no user-specified icon to attach to
+    else // Create a new icon.

     {
     {

-        // create our own one
-        m_ownsIcon = true;
-        m_icon = new wxTaskBarIcon;
+        wxASSERT_MSG( ms_refCountIcon == 0,
+                      wxS("Shouldn't reference not existent icon") );
+
+        ms_icon = new wxTaskBarIcon;
+        ms_refCountIcon = 1;

 
         // use the icon of the associated (or main, if none) frame
         wxIcon icon;
 
         // use the icon of the associated (or main, if none) frame
         wxIcon icon;


@@ -278,7 +319,7 @@ void wxBalloonNotifMsgImpl::SetUpIcon(wxWindow *win)
             icon = wxIcon(wxT("wxICON_AAA"));
         }
 
             icon = wxIcon(wxT("wxICON_AAA"));
         }
 

-        m_icon->SetIcon(icon);
+        ms_icon->SetIcon(icon);

     }
 }
 
     }
 }
 


@@ -288,9 +329,26 @@ wxBalloonNotifMsgImpl::DoShow(const wxString& title,
                               int timeout,
                               int flags)
 {
                               int timeout,
                               int flags)
 {

+    if ( !ms_icon->IsIconInstalled() )
+    {
+        // If we failed to install the icon (which does happen sometimes,
+        // although only in unusual circumstances, e.g. it happens regularly,
+        // albeit not constantly, if we're used soon after resume from suspend
+        // under Windows 7), we should not call ShowBalloon() because it would
+        // just assert and return and we must delete the icon ourselves because
+        // otherwise its associated wxTaskBarIconWindow would remain alive
+        // forever because we're not going to receive a notification about icon
+        // disappearance from the system if we failed to install it in the
+        // first place.
+        delete ms_icon;
+        ms_icon = NULL;
+
+        return false;
+    }
+

     timeout *= 1000; // Windows expresses timeout in milliseconds
 
     timeout *= 1000; // Windows expresses timeout in milliseconds
 

-    return m_icon->ShowBalloon(title, message, timeout, flags);
+    return ms_icon->ShowBalloon(title, message, timeout, flags);

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -305,7 +363,7 @@ wxManualNotifMsgImpl::wxManualNotifMsgImpl(wxWindow *win)
 
 wxManualNotifMsgImpl::~wxManualNotifMsgImpl()
 {
 
 wxManualNotifMsgImpl::~wxManualNotifMsgImpl()
 {

-    if ( m_icon )
+    if ( ms_icon )

         DoClose();
 }
 
         DoClose();
 }
 


@@ -320,7 +378,7 @@ wxManualNotifMsgImpl::DoShow(const wxString& title,
 
     // base class creates the icon for us initially but we could have destroyed
     // it in DoClose(), recreate it if this was the case
 
     // base class creates the icon for us initially but we could have destroyed
     // it in DoClose(), recreate it if this was the case

-    if ( !m_icon )
+    if ( !ms_icon )

         SetUpIcon(m_win);
 
     // use maximal (in current Windows versions) timeout (but it will still
         SetUpIcon(m_win);
 
     // use maximal (in current Windows versions) timeout (but it will still


@@ -330,19 +388,17 @@ wxManualNotifMsgImpl::DoShow(const wxString& title,
 
 bool wxManualNotifMsgImpl::DoClose()
 {
 
 bool wxManualNotifMsgImpl::DoClose()
 {

-    if ( m_ownsIcon )
+    if ( IsUsingOwnIcon() )

     {
         // we don't need the icon any more
     {
         // we don't need the icon any more

-        delete m_icon;
+        ReleaseIcon();

     }
     else // using an existing icon
     {
         // just hide the balloon
     }
     else // using an existing icon
     {
         // just hide the balloon

-        m_icon->ShowBalloon("", "");
+        ms_icon->ShowBalloon("", "");

     }
 
     }
 

-    m_icon = NULL;
-

     return true;
 }
 
     return true;
 }
 


@@ -353,11 +409,11 @@ bool wxManualNotifMsgImpl::DoClose()
 wxAutoNotifMsgImpl::wxAutoNotifMsgImpl(wxWindow *win)
                   : wxBalloonNotifMsgImpl(win)
 {
 wxAutoNotifMsgImpl::wxAutoNotifMsgImpl(wxWindow *win)
                   : wxBalloonNotifMsgImpl(win)
 {

-    if ( m_ownsIcon )
+    if ( ms_refCountIcon != -1 )

     {
     {

-        // This object will self-destruct and also delete the icon when the
-        // notification is hidden.
-        new wxNotificationIconEvtHandler(m_icon);
+        // This object will self-destruct and decrease the ref count of the
+        // icon when the notification is hidden.
+        new wxNotificationIconEvtHandler(ms_icon);

     }
 }
 
     }
 }