Bug 515768: Fennec needs a task switch button in titlebar for n900 (component), r=blassey

mobile/components/Makefile.in

@@ -59,10 +59,7 @@ EXTRA_COMPONENTS = \
 	$(NULL)
 
 DIRS = protocols \
+       phone \
        $(NULL)
 
-ifdef WINCE
-DIRS += phone
-endif
-
 include $(topsrcdir)/config/rules.mk

mobile/components/phone/Makefile.in

@@ -59,11 +59,17 @@ REQUIRES	= \
 CPPSRCS   = nsPhoneSupport.cpp
 XPIDLSRCS = nsIPhoneSupport.idl
 
+
 EXTRA_DSO_LDOPTS += \
 	$(XPCOM_GLUE_LDOPTS) \
 	$(NSPR_LIBS) \
 	$(NULL)
 
+ifdef MOZ_PLATFORM_HILDON
+LOCAL_INCLUDES   += $(MOZ_DBUS_GLIB_CFLAGS)
+EXTRA_DSO_LDOPTS += $(MOZ_DBUS_GLIB_LIBS)
+endif
+
 ifdef WINCE
 OS_LIBS += $(call EXPAND_LIBNAME, aygshell cellcore)
 endif

mobile/components/phone/nsIPhoneSupport.idl

@@ -53,4 +53,9 @@ interface nsIPhoneSupport : nsISupports
    * before dialing   
    */
   void makeCall(in wstring telephoneNumber, in wstring telephoneDescription, in boolean aPrompt);
+  
+  /**
+   * This method displays a UI to switch to (or launch) a different task
+   */
+  void switchTask();
 };

mobile/components/phone/nsPhoneSupport.cpp

@@ -38,8 +38,15 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+#ifdef WINCE_WINDOWS_MOBILE
 #include <windows.h>
 #include <phone.h>
+#endif
+
+#ifdef MOZ_PLATFORM_HILDON
+#include <dbus/dbus.h>
+#endif
+
 #include "nsStringAPI.h"
 #include "nsIPhoneSupport.h"
 #include "nsIGenericFactory.h"
@@ -63,15 +70,14 @@ nsPhoneSupport::MakeCall(const PRUnichar *telephoneNumber, const PRUnichar *tele
 {
   long result = -1;
 
+#ifdef WINCE_WINDOWS_MOBILE
   typedef LONG (*__PhoneMakeCall)(PHONEMAKECALLINFO *ppmci);
 
   HMODULE hPhoneDLL = LoadLibraryW(L"phone.dll");
-  if(hPhoneDLL)
-  {
-    __PhoneMakeCall MakeCall = (__PhoneMakeCall) GetProcAddress( hPhoneDLL,
-                                                                 "PhoneMakeCall");
-    if(MakeCall)
-    {
+  if (hPhoneDLL) {
+    __PhoneMakeCall MakeCall = (__PhoneMakeCall) GetProcAddress(hPhoneDLL,
+                                                                "PhoneMakeCall");
+    if (MakeCall) {
       PHONEMAKECALLINFO callInfo;
       callInfo.cbSize          = sizeof(PHONEMAKECALLINFO);
       callInfo.dwFlags         = aPrompt ? PMCF_PROMPTBEFORECALLING : PMCF_DEFAULT;
@@ -83,9 +89,35 @@ nsPhoneSupport::MakeCall(const PRUnichar *telephoneNumber, const PRUnichar *tele
     }
     FreeLibrary(hPhoneDLL);
   }
+#endif
+
   return (result == 0) ? NS_OK : NS_ERROR_FAILURE;
 }
 
+NS_IMETHODIMP
+nsPhoneSupport::SwitchTask()
+{
+#ifdef MOZ_PLATFORM_HILDON
+  DBusError error;
+  dbus_error_init(&error);
+
+  DBusConnection *conn = dbus_bus_get(DBUS_BUS_SESSION, &error);
+
+  DBusMessage *msg = dbus_message_new_signal("/com/nokia/hildon_desktop",
+                                             "com.nokia.hildon_desktop",
+                                             "exit_app_view");
+
+  if (msg) {
+      dbus_connection_send(conn, msg, NULL);
+      dbus_message_unref(msg);
+      dbus_connection_flush(conn);
+  }
+  return NS_OK;
+#else
+  return NS_ERROR_NOT_IMPLEMENTED;
+#endif
+}
+
 //------------------------------------------------------------------------------
 //  XPCOM REGISTRATION BELOW
 //------------------------------------------------------------------------------