81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
// 4 december 2014
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typedef BOOL (*handlerfunc)(struct table *, UINT, WPARAM, LPARAM, LRESULT *);
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#define HANDLER(name) static BOOL name(struct table *t, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
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static BOOL runHandlers(const handlerfunc list[], struct table *t, UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *lResult)
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{
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handlerfunc *p;
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for (p = list; *p != NULL; p++)
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if ((*(*p))(t, uMsg, wParam, lParam, lResult))
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return TRUE;
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return FALSE;
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}
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// memory allocation stuff
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// each of these functions do an implicit ZeroMemory()
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// these also make tableRealloc(NULL, ...)/tableFree(NULL) act like realloc(NULL, ...)/free(NULL) (that is, same as tableAlloc(...)/malloc(...) and a no-op, respectively)
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// we're using LocalAlloc() because:
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// - whether the malloc() family supports the last-error code is undefined
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// - the HeapAlloc() family DOES NOT support the last-error code; you're supposed to use Windows exceptions, and I can't find a clean way to do this with MinGW-w64 that doesn't rely on inline assembly or external libraries (unless they added __try/__except blocks)
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// - there's no VirtualReAlloc() to complement VirtualAlloc() and I'm not sure if we can even get the original allocated size back out reliably to write it ourselves (http://blogs.msdn.com/b/oldnewthing/archive/2012/03/16/10283988.aspx)
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// needless to say, TODO
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static void *tableAlloc(size_t size, const char *panicMessage)
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{
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HLOCAL out;
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out = LocalAlloc(LMEM_FIXED | LMEM_ZEROINIT, size);
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if (out == NULL)
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panic(panicMessage);
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return (void *) out;
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}
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static void *tableRealloc(void *p, size_t size, const char *panicMessage)
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{
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HLOCAL out;
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if (p == NULL)
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return tableAlloc(size, panicMessage);
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out = LocalReAlloc((HLOCAL) p, size, LMEM_ZEROINIT);
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if (out == NULL)
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panic(panicMessage);
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return (void *) out;
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}
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static void tableFree(void *p, const char *panicMessage)
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{
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if (p == NULL)
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return;
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if (LocalFree((HLOCAL) p) != NULL)
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panic(panicMessage);
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}
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// font selection
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static HFONT selectFont(struct table *t, HDC dc, HFONT *newfont)
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{
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HFONT prevfont;
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// copy it in casse we get a WM_SETFONT before this call's respective deselectFont() call
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*newfont = t->font;
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if (*newfont == NULL) {
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// get it on demand in the (unlikely) event it changes while this Table is alive
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*newfont = GetStockObject(SYSTEM_FONT);
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if (*newfont == NULL)
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panic("error getting default font for selecting into Table DC");
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}
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prevfont = (HFONT) SelectObject(dc, *newfont);
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if (prevfont == NULL)
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panic("error selecting Table font into Table DC");
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return prevfont;
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}
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static void deselectFont(HDC dc, HFONT prevfont, HFONT newfont)
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{
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if (SelectObject(dc, prevfont) != newfont)
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panic("error deselecting Table font from Table DC");
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// doin't delete newfont here, even if it is the system font (see http://msdn.microsoft.com/en-us/library/windows/desktop/dd144925%28v=vs.85%29.aspx)
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}
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