QFileSystemWatcher/Win32: Listen for WM_DEVICECHANGE

Add a class QWindowsRemovableDriveListener to
QWindowsFileSystemWatcherEngine listening to the WM_DEVICECHANGE messages
sent to the top level windows to detect insertion and removal of USB drives.
In addition, hook into QWindowsFileSystemWatcherEngine::addPaths() when
watching on removable drives, registering a notification for a
volume-lock-for-removal message on the internal window handle obtained from
QEventDispatcherWin32. When a request to lock the volume for removal is
received, remove the paths from the watcher, enabling removal.

The class instance is set as a dynamic property on the QFileSystemWatcher where
it can be retrieved from clients. This is primarily intended for use by
QFileInfoGatherer/QFileSystemModel.

Task-number: QTBUG-14290
Task-number: QTBUG-18729
Task-number: QTBUG-55459
Change-Id: Ic95b9d9291b1ec6f426c0702bad896bb064b9346
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/corelib/io/qfilesystemwatcher_p.h b/src/corelib/io/qfilesystemwatcher_p.h
index 6c64411f92..4220c1db28 100644
--- a/src/corelib/io/qfilesystemwatcher_p.h
+++ b/src/corelib/io/qfilesystemwatcher_p.h
@@ -58,6 +58,7 @@
 #include <private/qobject_p.h>
 
 #include <QtCore/qstringlist.h>
+#include <QtCore/qhash.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -106,6 +107,15 @@ public:
     // private slots
     void _q_fileChanged(const QString &path, bool removed);
     void _q_directoryChanged(const QString &path, bool removed);
+
+#if defined(Q_OS_WIN) && !defined(Q_OS_WINRT)
+    void _q_winDriveLockForRemoval(const QString &);
+    void _q_winDriveLockForRemovalFailed(const QString &);
+    void _q_winDriveRemoved(const QString &);
+
+private:
+    QHash<QChar, QStringList> temporarilyRemovedPaths;
+#endif // Q_OS_WIN && !Q_OS_WINRT
 };