fd08ccd246
wxRefCounter copy ctor was wrong as the new object had the same reference count as the old one instead of starting its life with reference count set to 1 as any new object should. While we could fix its copy ctor, it seems to be better to forbid copying wxRefCounter objects at all because the semantics of doing this is not obvious and the compiler-generated copy ctor in the derived classes often doesn't do what the code using it expects it to do, as was discovered by making wxRefCounter non copyable: see the fixes in the previous commits. To uncover all such bugs, make wxRefCounter and classes deriving from it non copyable. If this uncovers more problems, they should be fixed by implementing copying properly (and explicitly) in the derived classes. Closes #12768. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66374 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/gdiobj.h
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// Purpose: wxGDIObject base header
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// Author: Julian Smart
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// Modified by:
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// Created:
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// Copyright: (c) Julian Smart
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// RCS-ID: $Id$
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// Licence: wxWindows Licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_GDIOBJ_H_BASE_
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#define _WX_GDIOBJ_H_BASE_
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#include "wx/object.h"
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// ----------------------------------------------------------------------------
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// wxGDIRefData is the base class for wxXXXData structures which contain the
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// real data for the GDI object and are shared among all wxWin objects sharing
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// the same native GDI object
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxGDIRefData : public wxObjectRefData
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{
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public:
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// Default ctor which needs to be defined just because we use
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// wxDECLARE_NO_COPY_CLASS() below.
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wxGDIRefData() { }
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// override this in the derived classes to check if this data object is
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// really fully initialized
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virtual bool IsOk() const { return true; }
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private:
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wxDECLARE_NO_COPY_CLASS(wxGDIRefData);
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};
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// ----------------------------------------------------------------------------
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// wxGDIObject: base class for bitmaps, pens, brushes, ...
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxGDIObject : public wxObject
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{
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public:
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// checks if the object can be used
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virtual bool IsOk() const
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{
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// the cast here is safe because the derived classes always create
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// wxGDIRefData objects
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return m_refData && static_cast<wxGDIRefData *>(m_refData)->IsOk();
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}
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// don't use in the new code, use IsOk() instead
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bool IsNull() const { return m_refData == NULL; }
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// older version, for backwards compatibility only (but not deprecated
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// because it's still widely used)
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bool Ok() const { return IsOk(); }
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#if defined(__WXMSW__) || defined(__WXPM__) || defined(__WXPALMOS__)
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// Creates the resource
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virtual bool RealizeResource() { return false; }
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// Frees the resource
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virtual bool FreeResource(bool WXUNUSED(force) = false) { return false; }
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virtual bool IsFree() const { return false; }
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// Returns handle.
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virtual WXHANDLE GetResourceHandle() const { return 0; }
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#endif // defined(__WXMSW__) || defined(__WXPM__)
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protected:
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// replace base class functions using wxObjectRefData with our own which
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// use wxGDIRefData to ensure that we always work with data objects of the
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// correct type (i.e. derived from wxGDIRefData)
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virtual wxObjectRefData *CreateRefData() const
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{
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return CreateGDIRefData();
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}
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virtual wxObjectRefData *CloneRefData(const wxObjectRefData *data) const
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{
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return CloneGDIRefData(static_cast<const wxGDIRefData *>(data));
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}
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virtual wxGDIRefData *CreateGDIRefData() const = 0;
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virtual wxGDIRefData *CloneGDIRefData(const wxGDIRefData *data) const = 0;
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DECLARE_DYNAMIC_CLASS(wxGDIObject)
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};
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#endif // _WX_GDIOBJ_H_BASE_
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