vcl: remove boost/signal2/signal.hpp from header

The most relevant signal member function appears to be connect(),
so let's create a wrapper function for that now, without the more
esoteric ordering features for now.

Move the signal member itself to a new pImpl.

The benefits are worth it: preprocessor input reduced by 2.8GB,
that's 9% of the total (excluding system headers which are not counted
because they don't generate dependencies).

Change-Id: I0aaeda51a5630a348bb12c81a83f67afbd508a14
(cherry picked from commit 20bd0a2ee9ed899ea542c2de08efda243dbef446)

4 files changed, 44 insertions, 15 deletions

diff --git a/vcl/source/control/combobox.cxx b/vcl/source/control/combobox.cxx
index 15a3c0986588..9249acb8d616 100644
--- a/vcl/source/control/combobox.cxx
+++ b/vcl/source/control/combobox.cxx
@@ -284,8 +284,12 @@ void ComboBox::EnableAutocomplete( bool bEnable, bool bMatchCase )
     if ( bEnable )
     {
         if( !m_pImpl->m_AutocompleteConnection.connected())
-            m_pImpl->m_AutocompleteConnection = m_pImpl->m_pSubEdit->autocompleteSignal.connect(
-                boost::bind( &ComboBox::Impl::ImplAutocompleteHandler, m_pImpl.get(), _1 ) );
+        {
+            m_pImpl->m_pSubEdit->SignalConnectAutocomplete(
+                &m_pImpl->m_AutocompleteConnection,
+                [this] (Edit *const pEdit) { m_pImpl->ImplAutocompleteHandler(pEdit); }
+                );
+        }
     }
     else
         m_pImpl->m_AutocompleteConnection.disconnect();
diff --git a/vcl/source/control/edit.cxx b/vcl/source/control/edit.cxx
index ec786c054c23..75666df9aa0f 100644
--- a/vcl/source/control/edit.cxx
+++ b/vcl/source/control/edit.cxx
@@ -65,6 +65,9 @@
 #include <vcl/unohelp2.hxx>
 
 #include <officecfg/Office/Common.hxx>
+
+#include <boost/signals2/signal.hpp>
+
 #include <memory>
 
 using namespace ::com::sun::star;
@@ -154,21 +157,29 @@ void Impl_IMEInfos::DestroyAttribs()
     nLen = 0;
 }
 
-Edit::Edit( WindowType nType ) :
-    Control( nType )
+struct Edit::Impl
+{
+    boost::signals2::signal< void (Edit *) > m_AutocompleteSignal;
+};
+
+Edit::Edit( WindowType nType )
+    : Control( nType )
+    , m_pImpl(new Impl)
 {
     ImplInitEditData();
 }
 
-Edit::Edit( vcl::Window* pParent, WinBits nStyle ) :
-    Control( WINDOW_EDIT )
+Edit::Edit( vcl::Window* pParent, WinBits nStyle )
+    : Control( WINDOW_EDIT )
+    , m_pImpl(new Impl)
 {
     ImplInitEditData();
     ImplInit( pParent, nStyle );
 }
 
-Edit::Edit( vcl::Window* pParent, const ResId& rResId ) :
-    Control( WINDOW_EDIT )
+Edit::Edit( vcl::Window* pParent, const ResId& rResId )
+    : Control( WINDOW_EDIT )
+    , m_pImpl(new Impl)
 {
     rResId.SetRT( RSC_EDIT );
     WinBits nStyle = ImplInitRes( rResId );
@@ -1648,12 +1659,12 @@ bool Edit::ImplHandleKeyEvent( const KeyEvent& rKEvt )
                         ImplCopyToSelectionClipboard();
                     }
 
-                    if ( bGoEnd && !autocompleteSignal.empty() && !rKEvt.GetKeyCode().GetModifier() )
+                    if (bGoEnd && !m_pImpl->m_AutocompleteSignal.empty() && !rKEvt.GetKeyCode().GetModifier())
                     {
                         if ( (maSelection.Min() == maSelection.Max()) && (maSelection.Min() == maText.getLength()) )
                         {
                             meAutocompleteAction = AUTOCOMPLETE_KEYINPUT;
-                            autocompleteSignal( this );
+                            m_pImpl->m_AutocompleteSignal( this );
                         }
                     }
 
@@ -1748,12 +1759,12 @@ bool Edit::ImplHandleKeyEvent( const KeyEvent& rKEvt )
                     if ( !mbReadOnly )
                     {
                         ImplInsertText(OUString(rKEvt.GetCharCode()), 0, true);
-                        if ( !autocompleteSignal.empty() )
+                        if (!m_pImpl->m_AutocompleteSignal.empty())
                         {
                             if ( (maSelection.Min() == maSelection.Max()) && (maSelection.Min() == maText.getLength()) )
                             {
                                 meAutocompleteAction = AUTOCOMPLETE_KEYINPUT;
-                                autocompleteSignal( this );
+                                m_pImpl->m_AutocompleteSignal( this );
                             }
                         }
                     }
@@ -2114,12 +2125,12 @@ void Edit::Command( const CommandEvent& rCEvt )
         Invalidate();
 
         // #i25161# call auto complete handler for ext text commit also
-        if ( autocompleteSignal.empty() )
+        if (m_pImpl->m_AutocompleteSignal.empty())
         {
             if ( (maSelection.Min() == maSelection.Max()) && (maSelection.Min() == maText.getLength()) )
             {
                 meAutocompleteAction = AUTOCOMPLETE_KEYINPUT;
-                autocompleteSignal( this );
+                m_pImpl->m_AutocompleteSignal( this );
             }
         }
     }
@@ -2731,7 +2742,7 @@ void Edit::SetSubEdit(Edit* pEdit)
         mpSubEdit->mbIsSubEdit = true;
 
         mpSubEdit->SetReadOnly(mbReadOnly);
-        mpSubEdit->autocompleteSignal.connect(autocompleteSignal);
+        mpSubEdit->m_pImpl->m_AutocompleteSignal.connect(m_pImpl->m_AutocompleteSignal);
     }
 }
 
@@ -3058,4 +3069,14 @@ Selection Edit::GetSurroundingTextSelection() const
   return GetSelection();
 }
 
+void Edit::SignalConnectAutocomplete(
+        boost::signals2::connection *const pConnection,
+        std::function<void (Edit *)> slot)
+{
+    boost::signals2::connection const& rConnection(
+            m_pImpl->m_AutocompleteSignal.connect(slot));
+    if (pConnection)
+        *pConnection = rConnection;
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/source/filter/wmf/wmf.cxx b/vcl/source/filter/wmf/wmf.cxx
index 21ab4a46c8be..c566bc3e7b04 100644
--- a/vcl/source/filter/wmf/wmf.cxx
+++ b/vcl/source/filter/wmf/wmf.cxx
@@ -24,6 +24,8 @@
 #include <vcl/gdimetafiletools.hxx>
 #include <comphelper/scopeguard.hxx>
 
+#include <boost/bind.hpp>
+
 bool ConvertWMFToGDIMetaFile( SvStream & rStreamWMF, GDIMetaFile & rGDIMetaFile, FilterConfigItem* pConfigItem, WMF_EXTERNALHEADER *pExtHeader )
 {
     sal_uInt32 nMetaType;
diff --git a/vcl/unx/generic/window/salframe.cxx b/vcl/unx/generic/window/salframe.cxx
index 7c6000c5e5a7..756f42e1b49e 100644
--- a/vcl/unx/generic/window/salframe.cxx
+++ b/vcl/unx/generic/window/salframe.cxx
@@ -70,6 +70,8 @@
 #include "svids.hrc"
 #include "impbmp.hxx"
 
+#include <boost/optional.hpp>
+
 #include <algorithm>
 
 #ifndef Button6