Implement wxTextCtrl::ShowPosition() (wxOSX)

Closes #17811.

docs/changes.txt

@@ -221,6 +221,7 @@ wxOSX:
 - Fix handling CTM in wxGraphicsContext::SeTransform and GetTransform().
 - Allow turning on/off opacity selector in wxColourDialog.
 - Implement wxTextCtrl::PositionToXY() and XYToPosition().
+- Implement wxTextCtrl::ShowPosition().
 
 Unix:
 

include/wx/osx/cocoa/private/textimpl.h

@@ -64,6 +64,7 @@ public :
     virtual void SetSelection( long from , long to );
     virtual bool PositionToXY(long pos, long *x, long *y) const wxOVERRIDE;
     virtual long XYToPosition(long x, long y) const wxOVERRIDE;
+    virtual void ShowPosition(long pos) wxOVERRIDE;
     virtual void WriteText(const wxString& str) ;
     virtual bool HasOwnContextMenu() const { return true; }
     virtual bool SetHint(const wxString& hint);
@@ -106,6 +107,7 @@ public:
     virtual void SetSelection( long from , long to );
     virtual bool PositionToXY(long pos, long *x, long *y) const wxOVERRIDE;
     virtual long XYToPosition(long x, long y) const wxOVERRIDE;
+    virtual void ShowPosition(long pos) wxOVERRIDE;
     virtual void WriteText(const wxString& str) ;
     virtual void SetFont( const wxFont & font , const wxColour& foreground , long windowStyle, bool ignoreBlack = true );
 

include/wx/osx/core/private.h

@@ -685,7 +685,7 @@ public :
     virtual int GetNumberOfLines() const ;
     virtual long XYToPosition(long x, long y) const;
     virtual bool PositionToXY(long pos, long *x, long *y) const ;
-    virtual void ShowPosition(long WXUNUSED(pos)) ;
+    virtual void ShowPosition(long pos) ;
     virtual int GetLineLength(long lineNo) const ;
     virtual wxString GetLineText(long lineNo) const ;
     virtual void CheckSpelling(bool WXUNUSED(check)) { }

src/osx/cocoa/textctrl.mm

@@ -933,6 +933,15 @@ long wxNSTextViewControl::XYToPosition(long x, long y) const
     return lineRng.location + x;
 }
 
+void wxNSTextViewControl::ShowPosition(long pos)
+{
+    if ( !m_textView )
+        return;
+
+    wxCHECK_RET( pos >= 0, wxS("Invalid character position") );
+    [m_textView scrollRangeToVisible:NSMakeRange(pos, 1)];
+}
+
 void wxNSTextViewControl::WriteText(const wxString& str)
 {
     wxString st = str;
@@ -1246,6 +1255,16 @@ long wxNSTextFieldControl::XYToPosition(long x, long y) const
     return x;
 }
 
+void wxNSTextFieldControl::ShowPosition(long pos)
+{
+    wxCHECK_RET( pos >= 0, wxS("Invalid character position") );
+    NSText* editor = [m_textField currentEditor];
+    if ( editor )
+    {
+        [editor scrollRangeToVisible:NSMakeRange(pos, 1)];
+    }
+}
+
 void wxNSTextFieldControl::WriteText(const wxString& str)
 {
     NSEvent* formerEvent = m_lastKeyDownEvent;