Add method for checking of QPixmapCache::Key validity

We need a method to check whether a specified pixmap is still
cached without touching the recently-accessed list for this pixmap.

[ChangeLog][QtGui][QPixmapCache] Added QPixmapCache::Key::isValid().

Change-Id: I90fa4f67b569099b67b6207e78494beb3111b68e
Reviewed-by: aavit <eirik.aavitsland@theqtcompany.com>

2 files changed, 11 insertions, 0 deletions

diff --git a/src/gui/image/qpixmapcache.cpp b/src/gui/image/qpixmapcache.cpp
index 71a79745e8..04e1d442b0 100644
--- a/src/gui/image/qpixmapcache.cpp
+++ b/src/gui/image/qpixmapcache.cpp
@@ -156,6 +156,16 @@ bool QPixmapCache::Key::operator ==(const Key &key) const
 */
 
 /*!
+    Returns \c true if there is a cached pixmap associated with this key.
+    Otherwise, if pixmap was flushed, the key is no longer valid.
+    \since 5.7
+*/
+bool QPixmapCache::Key::isValid() const Q_DECL_NOTHROW
+{
+    return d && d->isValid;
+}
+
+/*!
     \internal
 */
 QPixmapCache::Key &QPixmapCache::Key::operator =(const Key &other)
diff --git a/src/gui/image/qpixmapcache.h b/src/gui/image/qpixmapcache.h
index 37a0588e06..ca18f299a7 100644
--- a/src/gui/image/qpixmapcache.h
+++ b/src/gui/image/qpixmapcache.h
@@ -59,6 +59,7 @@ public:
         Key &operator =(const Key &other);
 
         void swap(Key &other) Q_DECL_NOTHROW { qSwap(d, other.d); }
+        bool isValid() const Q_DECL_NOTHROW;
 
     private:
         KeyData *d;