Implement cache for FileWidget

Some data-gathering is quite expensive and requires a QProcess, like
getting the duration, so cache it in memory using QCache. Once the cache
is filled, the UI is much snappier.

This simplifies gatherData() a bit. It's still quite a long function,
but now it doesn't create the QStandardItems any more. I moved it to a
separate function.

1 files changed, 3 insertions, 0 deletions

diff --git a/cachedfiledata.cpp b/cachedfiledata.cpp
new file mode 100644
index 0000000..6f51edb
--- /dev/null
+++ b/cachedfiledata.cpp
@@ -0,0 +1,3 @@
+#include "cachedfiledata.h"
+
+CachedFileData::CachedFileData() : seconds(0), size(0), attr(-1), copied(false) {}