Add support for progress bar callbacks to LibreOfficeKit clients

The comphelper::LibreOfficeKit bits. Also will need additions to the
libsofficeapp bits in desktop and then to the StatusIndicator implementation
in framework.

Change-Id: I15c2505bbf6439c07d1956685d0a6d2a22aefc58

comphelper/source/misc/lok.cxx

@@ -27,6 +27,33 @@ bool isActive()
     return bActive;
 }
 
+static void (*pStatusIndicatorCallback)(void *data, statusIndicatorCallbackType type, int percent)(nullptr);
+static void *pStatusIndicatorCallbackData(nullptr);
+
+void setStatusIndicatorCallback(void (*callback)(void *data, statusIndicatorCallbackType type, int percent), void *data)
+{
+    pStatusIndicatorCallback = callback;
+    pStatusIndicatorCallbackData = data;
+}
+
+void statusIndicatorStart()
+{
+    if (pStatusIndicatorCallback)
+        pStatusIndicatorCallback(pStatusIndicatorCallbackData, statusIndicatorCallbackType::Start, 0);
+}
+
+void statusIndicatorSetValue(int percent)
+{
+    if (pStatusIndicatorCallback)
+        pStatusIndicatorCallback(pStatusIndicatorCallbackData, statusIndicatorCallbackType::SetValue, percent);
+}
+
+void statusIndicatorFinish()
+{
+    if (pStatusIndicatorCallback)
+        pStatusIndicatorCallback(pStatusIndicatorCallbackData, statusIndicatorCallbackType::Finish, 0);
+}
+
 } // namespace LibreOfficeKit
 
 } // namespace comphelper

include/comphelper/lok.hxx

@@ -22,6 +22,16 @@ COMPHELPER_DLLPUBLIC void setActive();
 
 COMPHELPER_DLLPUBLIC bool isActive();
 
+enum class statusIndicatorCallbackType { Start, SetValue, Finish };
+
+COMPHELPER_DLLPUBLIC void setStatusIndicatorCallback(void (*callback)(void *data, statusIndicatorCallbackType type, int percent), void *data);
+
+COMPHELPER_DLLPUBLIC void statusIndicatorStart();
+
+COMPHELPER_DLLPUBLIC void statusIndicatorSetValue(int percent);
+
+COMPHELPER_DLLPUBLIC void statusIndicatorFinish();
+
 }
 }