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92 lines
3 KiB
C++
92 lines
3 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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// 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__)
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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 NULL; }
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#endif // defined(__WXMSW__)
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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 wxOVERRIDE
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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 wxOVERRIDE
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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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wxDECLARE_DYNAMIC_CLASS(wxGDIObject);
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};
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#endif // _WX_GDIOBJ_H_BASE_
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