111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
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/*
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* Copyright (c) 1985 - 1999, Microsoft Corporation
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* Maps a property key string into an atom.
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* History:
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* 21-Dec-1994 JimA Created.
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*/
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__inline ATOM MapPropertyKey(PCWSTR pszKey)
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{
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#ifdef _USERK_
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/*
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* Internal properties must use atoms, not strings.
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*/
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UserAssert(!IS_PTR(pszKey));
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#else
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/*
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* Is pszKey an atom? If not, find the atom that matches the string.
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* If one doesn't exist, bail out.
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*/
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if (IS_PTR(pszKey))
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return GlobalFindAtomW(pszKey);
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#endif
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return PTR_TO_ID(pszKey);
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}
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/*
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* Search the window's property list for the specified property.
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* pszKey could be a string or an atom.
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* If it is a string, convert it to an atom before lookup.
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* FindProp will only find internal or external properties depending on the fInternal flag.
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* History:
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* 11-14-90 darrinm Rewrote from scratch with new data structures and algorithms.
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*/
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PPROP _FindProp(PWND pwnd, PCWSTR pszKey, BOOL fInternal)
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{
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UINT i;
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PPROPLIST ppropList;
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PPROP pprop;
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ATOM atomKey;
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/*
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* Make sure we have a property list.
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*/
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ppropList = REBASE(pwnd, ppropList);
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if (ppropList == NULL)
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return NULL;
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/*
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* Call to the appropriate routine to verify the key name.
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*/
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atomKey = MapPropertyKey(pszKey);
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if (atomKey == 0)
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return NULL;
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/*
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* Now we've got the atom, search the list for a property with the same atom/name.
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* Make sure to only return internal properties if the fInternal flag is set.
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* Do the same for external properties.
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*/
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pprop = ppropList->aprop;
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for (i = ppropList->iFirstFree; i > 0; i--) {
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if (pprop->atomKey == atomKey) {
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if (fInternal) {
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if (pprop->fs & PROPF_INTERNAL)
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return pprop;
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} else {
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if (!(pprop->fs & PROPF_INTERNAL))
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return pprop;
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}
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}
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pprop++;
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}
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/*
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* Property not found, too bad.
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*/
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return NULL;
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}
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/*
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* Search the window's property list for the specified property and return the hData handle from it.
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* If the property is not found, NULL is returned.
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* History:
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* 11-14-90 darrinm Rewrote from scratch with new data structures and algorithms.
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*/
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HANDLE _GetProp(PWND pwnd, PCWSTR pszKey, BOOL fInternal)
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{
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PPROP pprop;
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/*
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* A quick little optimization for that case where the window has no properties at all.
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*/
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if (pwnd->ppropList == NULL)
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return NULL;
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/*
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* FindProp does all the work, including converting pszKey to an atom
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* (if necessary) for property lookup.
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*/
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pprop = _FindProp(pwnd, pszKey, fInternal);
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if (pprop == NULL)
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return NULL;
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return pprop->hData;
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}
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