Count the items inside directories in another thread

This prevents that the GUI freezes if there are many files inside the
directory, or if the access to the directory is slow for some other
reason.

BUG: 318518
REVIEW: 111920
FIXED-IN: 4.12.0

1 files changed, 71 insertions, 0 deletions

diff --git a/src/kitemviews/private/kdirectorycontentscounterworker.h b/src/kitemviews/private/kdirectorycontentscounterworker.h
new file mode 100644
index 000000000..96831ef81
--- /dev/null
+++ b/src/kitemviews/private/kdirectorycontentscounterworker.h
@@ -0,0 +1,71 @@
+/***************************************************************************
+ *   Copyright (C) 2013 by Frank Reininghaus <[email protected]>    *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#ifndef KDIRECTORYCONTENTENTSCOUNTERWORKER_H
+#define KDIRECTORYCONTENTENTSCOUNTERWORKER_H
+
+#include <QFlags>
+#include <QMetaType>
+#include <QObject>
+
+class QString;
+
+class KDirectoryContentsCounterWorker : public QObject
+{
+    Q_OBJECT
+
+public:
+    enum Option {
+        NoOptions = 0x0,
+        CountHiddenFiles = 0x1,
+        CountDirectoriesOnly = 0x2
+    };
+    Q_DECLARE_FLAGS(Options, Option)
+
+    explicit KDirectoryContentsCounterWorker(QObject* parent = 0);
+
+    /**
+     * Counts the items inside the directory \a path using the options
+     * \a options.
+     *
+     * @return The number of items.
+     */
+    static int subItemsCount(const QString& path, Options options);
+
+signals:
+    /**
+     * Signals that the directory \a path contains \a count items.
+     */
+    void result(const QString& path, int count);
+
+public slots:
+    /**
+     * Requests the number of items inside the directory \a path using the
+     * options \a options. The result is announced via the signal \a result.
+     */
+    // Note that the full type name KDirectoryContentsCounterWorker::Options
+    // is needed here. Just using 'Options' is OK for the compiler, but
+    // confuses moc.
+    void countDirectoryContents(const QString& path, KDirectoryContentsCounterWorker::Options options);
+};
+
+Q_DECLARE_METATYPE(KDirectoryContentsCounterWorker::Options)
+Q_DECLARE_OPERATORS_FOR_FLAGS(KDirectoryContentsCounterWorker::Options)
+
+#endif