Implement wxWindow::ShowWithEffect() for wxOSX/Cocoa.

This version animates the window asynchronously and is being checked in just
to preserve it in svn if we later decide to return to this semantics. It will
be replaced by synchronous animation in the next commit.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62304 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/window.h

@@ -63,6 +63,16 @@ public:
     virtual void Lower();
 
     virtual bool Show( bool show = true );
+    virtual bool ShowWithEffect(wxShowEffect effect,
+                                unsigned timeout = 0)
+    {
+        return OSXShowWithEffect(true, effect, timeout);
+    }
+    virtual bool HideWithEffect(wxShowEffect effect,
+                                unsigned timeout = 0)
+    {
+        return OSXShowWithEffect(false, effect, timeout);
+    }
 
     virtual bool IsShownOnScreen() const;
 
@@ -341,6 +351,11 @@ protected:
     virtual void DoSetToolTip( wxToolTip *tip );
 #endif
 
+    // common part of Show/HideWithEffect()
+    virtual bool OSXShowWithEffect(bool show,
+                                   wxShowEffect effect,
+                                   unsigned timeout);
+
 private:
     // common part of all ctors
     void Init();
@@ -349,7 +364,6 @@ private:
     // AlwaysShowScrollbars()
     void DoUpdateScrollbarVisibility();
 
-
     wxDECLARE_NO_COPY_CLASS(wxWindowMac);
     DECLARE_EVENT_TABLE()
 };