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1 | ///////////////////////////////////////////////////////////////////////////// | |
2 | // Name: gdiobj.h | |
3 | // Purpose: wxGDIObject class: base class for other GDI classes | |
4 | // Author: Julian Smart | |
5 | // Modified by: | |
6 | // Created: 01/02/97 | |
7 | // RCS-ID: $Id$ | |
8 | // Copyright: (c) Julian Smart | |
9 | // Licence: wxWindows licence | |
10 | ///////////////////////////////////////////////////////////////////////////// | |
11 | ||
12 | #ifndef _WX_GDIOBJ_H_ | |
13 | #define _WX_GDIOBJ_H_ | |
14 | ||
15 | #include "wx/object.h" | |
16 | ||
17 | #ifdef __GNUG__ | |
18 | #pragma interface "gdiobj.h" | |
19 | #endif | |
20 | ||
21 | // wxGDIRefData is the reference-counted data part of a GDI object. | |
22 | // It contains another counter, m_usageCount, which counts the number | |
23 | // of times this object has been used; e.g. in SetFont, the count | |
24 | // is incremented. This is different from reference counting, | |
25 | // where only the constructors, destructors and (un)clone operations | |
26 | // affect the reference count. | |
27 | // THIS IS NOW BEING REMOVED AS REDUNDANT AND ERROR-PRONE | |
28 | ||
29 | class WXDLLEXPORT wxGDIRefData: public wxObjectRefData { | |
30 | public: | |
31 | inline wxGDIRefData(void) | |
32 | { | |
33 | } | |
34 | }; | |
35 | ||
36 | #define M_GDIDATA ((wxGDIRefData *)m_refData) | |
37 | ||
38 | class WXDLLEXPORT wxGDIObject: public wxObject | |
39 | { | |
40 | DECLARE_DYNAMIC_CLASS(wxGDIObject) | |
41 | public: | |
42 | inline wxGDIObject(void) { m_visible = FALSE; }; | |
43 | inline ~wxGDIObject(void) {}; | |
44 | ||
45 | // Creates the resource | |
46 | virtual bool RealizeResource(void) { return FALSE; }; | |
47 | ||
48 | // Frees the resource | |
49 | virtual bool FreeResource(bool WXUNUSED(force) = FALSE) { return FALSE; }; | |
50 | ||
51 | virtual bool IsFree(void) const { return FALSE; }; | |
52 | ||
53 | inline bool IsNull(void) const { return (m_refData == 0); } | |
54 | ||
55 | // Returns handle. | |
56 | virtual WXHANDLE GetResourceHandle(void) { return 0; } | |
57 | ||
58 | virtual bool GetVisible(void) { return m_visible; } | |
59 | virtual void SetVisible(bool v) { m_visible = v; } | |
60 | ||
61 | protected: | |
62 | bool m_visible; // Can a pointer to this object be safely taken? | |
63 | // - only if created within FindOrCreate... | |
64 | }; | |
65 | ||
66 | #endif | |
67 | // _WX_GDIOBJ_H_ |