Move class SliderAx into WindowAccessible.* ...

... so ScienFilter.cpp doesn't depend on Equalization.h

src/widgets/WindowAccessible.h

@@ -27,5 +27,75 @@ public:
 
 };
 
+class SliderAx final : public WindowAccessible
+{
+public:
+   SliderAx(wxWindow * window, const wxString &fmt);
+
+   virtual ~ SliderAx();
+
+   // Retrieves the address of an IDispatch interface for the specified child.
+   // All objects must support this property.
+   wxAccStatus GetChild(int childId, wxAccessible** child) override;
+
+   // Gets the number of children.
+   wxAccStatus GetChildCount(int* childCount) override;
+
+   // Gets the default action for this object (0) or > 0 (the action for a child).
+   // Return wxACC_OK even if there is no action. actionName is the action, or the empty
+   // string if there is no action.
+   // The retrieved string describes the action that is performed on an object,
+   // not what the object does as a result. For example, a toolbar button that prints
+   // a document has a default action of "Press" rather than "Prints the current document."
+   wxAccStatus GetDefaultAction(int childId, wxString *actionName) override;
+
+   // Returns the description for this object or a child.
+   wxAccStatus GetDescription(int childId, wxString *description) override;
+
+   // Gets the window with the keyboard focus.
+   // If childId is 0 and child is NULL, no object in
+   // this subhierarchy has the focus.
+   // If this object has the focus, child should be 'this'.
+   wxAccStatus GetFocus(int *childId, wxAccessible **child) override;
+
+   // Returns help text for this object or a child, similar to tooltip text.
+   wxAccStatus GetHelpText(int childId, wxString *helpText) override;
+
+   // Returns the keyboard shortcut for this object or child.
+   // Return e.g. ALT+K
+   wxAccStatus GetKeyboardShortcut(int childId, wxString *shortcut) override;
+
+   // Returns the rectangle for this object (id = 0) or a child element (id > 0).
+   // rect is in screen coordinates.
+   wxAccStatus GetLocation(wxRect& rect, int elementId) override;
+
+   // Gets the name of the specified object.
+   wxAccStatus GetName(int childId, wxString *name) override;
+
+   // Returns a role constant.
+   wxAccStatus GetRole(int childId, wxAccRole *role) override;
+
+   // Gets a variant representing the selected children
+   // of this object.
+   // Acceptable values:
+   // - a null variant (IsNull() returns TRUE)
+   // - a list variant (GetType() == wxT("list"))
+   // - an integer representing the selected child element,
+   //   or 0 if this object is selected (GetType() == wxT("long"))
+   // - a "void*" pointer to a wxAccessible child object
+   wxAccStatus GetSelections(wxVariant *selections) override;
+
+   // Returns a state constant.
+   wxAccStatus GetState(int childId, long* state) override;
+
+   // Returns a localized string representing the value for the object
+   // or child.
+   wxAccStatus GetValue(int childId, wxString* strValue) override;
+
+private:
+   wxWindow *mParent;
+   wxString mFmt;
+};
+
 #endif      // wxUSE_ACCESSIBILITY
 #endif      // __AUDACITY_WINDOW_ACCESSIBLE__