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39
40 #include <QtGui/qtguiglobal.h>
41 #if QT_CONFIG(accessibility)
42
43 #include "qwinrtuiaprovidercache.h"
44
45 QT_BEGIN_NAMESPACE
46
47 // Private constructor
QWinRTUiaProviderCache()48 QWinRTUiaProviderCache::QWinRTUiaProviderCache()
49 {
50 }
51
52 // shared instance
instance()53 QWinRTUiaProviderCache *QWinRTUiaProviderCache::instance()
54 {
55 static QWinRTUiaProviderCache providerCache;
56 return &providerCache;
57 }
58
59 // Returns the provider instance associated with the ID, or nullptr.
providerForId(QAccessible::Id id) const60 QWinRTUiaBaseProvider *QWinRTUiaProviderCache::providerForId(QAccessible::Id id) const
61 {
62 return m_providerTable.value(id);
63 }
64
65 // Inserts a provider in the cache and associates it with an accessibility ID.
insert(QAccessible::Id id,QWinRTUiaBaseProvider * provider)66 void QWinRTUiaProviderCache::insert(QAccessible::Id id, QWinRTUiaBaseProvider *provider)
67 {
68 remove(id);
69 if (provider) {
70 m_providerTable[id] = provider;
71 m_inverseTable[provider] = id;
72 // Connects the destroyed signal to our slot, to remove deleted objects from the cache.
73 QObject::connect(provider, &QObject::destroyed, this, &QWinRTUiaProviderCache::objectDestroyed);
74 }
75 }
76
77 // Removes deleted provider objects from the cache.
objectDestroyed(QObject * obj)78 void QWinRTUiaProviderCache::objectDestroyed(QObject *obj)
79 {
80 // We have to use the inverse table to map the object address back to its ID,
81 // since at this point (called from QObject destructor), it has already been
82 // partially destroyed and we cannot treat it as a provider.
83 auto it = m_inverseTable.find(obj);
84 if (it != m_inverseTable.end()) {
85 m_providerTable.remove(*it);
86 m_inverseTable.remove(obj);
87 }
88 }
89
90 // Removes a provider with a given id from the cache.
remove(QAccessible::Id id)91 void QWinRTUiaProviderCache::remove(QAccessible::Id id)
92 {
93 m_inverseTable.remove(m_providerTable.value(id));
94 m_providerTable.remove(id);
95 }
96
97 QT_END_NAMESPACE
98
99 #endif // QT_CONFIG(accessibility)
100