support linking a Slider with a NumericField

Change-Id: I5cfd28d278cc21884eb9bf1b0e5a619c871f6bd2

include/vcl/slider.hxx

@@ -23,6 +23,7 @@
 #include <vcl/dllapi.h>
 #include <vcl/ctrl.hxx>
 #include <vcl/scrbar.hxx>
+#include <vcl/field.hxx>
 
 class VCL_DLLPUBLIC Slider : public Control
 {
@@ -51,9 +52,14 @@ private:
     ScrollType      meScrollType;
     bool            mbCalcSize;
     bool            mbFullDrag;
+
+    NumericField*   mpLinkedField;
+
     Link<>          maSlideHdl;
     Link<>          maEndSlideHdl;
 
+    DECL_LINK(LinkedFieldModifyHdl, NumericField*);
+
     using Control::ImplInitSettings;
     using Window::ImplInit;
     SAL_DLLPRIVATE void ImplInit( vcl::Window* pParent, WinBits nStyle );
@@ -70,6 +76,8 @@ private:
     SAL_DLLPRIVATE void ImplDoMouseAction( const Point& rPos, bool bCallAction = true );
     SAL_DLLPRIVATE long ImplDoSlide( long nNewPos );
     SAL_DLLPRIVATE long ImplDoSlideAction( ScrollType eScrollType );
+    SAL_DLLPRIVATE void ImplSetFieldLink(const Link<>& rLink);
+    SAL_DLLPRIVATE void ImplUpdateLinkedField();
 
 public:
                     Slider( vcl::Window* pParent, WinBits nStyle = WB_HORZ );
@@ -108,6 +116,8 @@ public:
 
     Size            CalcWindowSizePixel();
 
+    void            SetLinkedField(NumericField* pField);
+
     void            SetSlideHdl( const Link<>& rLink ) { maSlideHdl = rLink; }
     const Link<>&   GetSlideHdl() const { return maSlideHdl;    }
     void            SetEndSlideHdl( const Link<>& rLink ) { maEndSlideHdl = rLink; }

vcl/source/control/slider.cxx

@@ -68,6 +68,8 @@ void Slider::ImplInit( vcl::Window* pParent, WinBits nStyle )
     mbCalcSize          = true;
     mbFullDrag          = true;
 
+    mpLinkedField       = nullptr;
+
     Control::ImplInit( pParent, nStyle, NULL );
 
     ImplInitSettings();
@@ -75,7 +77,7 @@ void Slider::ImplInit( vcl::Window* pParent, WinBits nStyle )
 }
 
 Slider::Slider( vcl::Window* pParent, WinBits nStyle ) :
-    Control( WINDOW_SLIDER )
+    Control(WINDOW_SLIDER)
 {
     ImplInit( pParent, nStyle );
 }
@@ -211,6 +213,34 @@ void Slider::ImplUpdateRects( bool bUpdate )
     }
 }
 
+void Slider::ImplSetFieldLink(const Link<>& rLink)
+{
+    if (mpLinkedField != nullptr)
+    {
+        mpLinkedField->SetModifyHdl(rLink);
+        mpLinkedField->SetUpHdl(rLink);
+        mpLinkedField->SetDownHdl(rLink);
+        mpLinkedField->SetFirstHdl(rLink);
+        mpLinkedField->SetLastHdl(rLink);
+        mpLinkedField->SetLoseFocusHdl(rLink);
+    }
+}
+
+void Slider::ImplUpdateLinkedField()
+{
+    if (mpLinkedField)
+        mpLinkedField->SetValue(mnThumbPos);
+}
+
+IMPL_LINK(Slider, LinkedFieldModifyHdl, NumericField*, pField)
+{
+    if (pField)
+    {
+        SetThumbPos(pField->GetValue());
+    }
+    return 0;
+}
+
 long Slider::ImplCalcThumbPos( long nPixPos )
 {
     // calculate position
@@ -762,6 +792,7 @@ void Slider::Tracking( const TrackingEvent& rTEvt )
                 {
                     ImplUpdateRects();
                     Update();
+                    ImplUpdateLinkedField();
                     if ( mbFullDrag && (nOldPos != mnThumbPos) )
                     {
                         mnDelta = mnThumbPos-nOldPos;
@@ -839,6 +870,13 @@ void Slider::Resize()
     Invalidate();
 }
 
+void Slider::SetLinkedField(NumericField* pField)
+{
+    ImplSetFieldLink(Link<>());
+    mpLinkedField = pField;
+    ImplSetFieldLink(LINK(this, Slider, LinkedFieldModifyHdl));
+}
+
 void Slider::RequestHelp( const HelpEvent& rHEvt )
 {
     Control::RequestHelp( rHEvt );
@@ -947,7 +985,7 @@ void Slider::SetRange( const Range& rRange )
             mnThumbPos = mnMaxRange;
         if ( mnThumbPos < mnMinRange )
             mnThumbPos = mnMinRange;
-
+        ImplUpdateLinkedField();
         StateChanged( StateChangedType::Data );
     }
 }
@@ -962,6 +1000,7 @@ void Slider::SetThumbPos( long nNewThumbPos )
     if ( mnThumbPos != nNewThumbPos )
     {
         mnThumbPos = nNewThumbPos;
+        ImplUpdateLinkedField();
         StateChanged( StateChangedType::Data );
     }
 }