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, 95 insertions, 0 deletions

diff --git a/src/kitemviews/private/kdirectorycontentscounterworker.cpp b/src/kitemviews/private/kdirectorycontentscounterworker.cpp
new file mode 100644
index 000000000..e649c20e1
--- /dev/null
+++ b/src/kitemviews/private/kdirectorycontentscounterworker.cpp
@@ -0,0 +1,95 @@
+/***************************************************************************
+ *   Copyright (C) 2011 by Peter Penz <[email protected]>             *
+ *   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            *
+ ***************************************************************************/
+
+#include "kdirectorycontentscounterworker.h"
+
+// Required includes for subItemsCount():
+#ifdef Q_WS_WIN
+    #include <QDir>
+#else
+    #include <dirent.h>
+    #include <QFile>
+#endif
+
+KDirectoryContentsCounterWorker::KDirectoryContentsCounterWorker(QObject* parent) :
+    QObject(parent)
+{
+    qRegisterMetaType<KDirectoryContentsCounterWorker::Options>();
+}
+
+int KDirectoryContentsCounterWorker::subItemsCount(const QString& path, Options options)
+{
+    const bool countHiddenFiles = options & CountHiddenFiles;
+    const bool countDirectoriesOnly = options & CountDirectoriesOnly;
+
+#ifdef Q_WS_WIN
+    QDir dir(path);
+    QDir::Filters filters = QDir::NoDotAndDotDot | QDir::System;
+    if (countHiddenFiles) {
+        filters |= QDir::Hidden;
+    }
+    if (countDirectoriesOnly) {
+        filters |= QDir::Dirs;
+    } else {
+        filters |= QDir::AllEntries;
+    }
+    return dir.entryList(filters).count();
+#else
+    // Taken from kdelibs/kio/kio/kdirmodel.cpp
+    // Copyright (C) 2006 David Faure <[email protected]>
+
+    int count = -1;
+    DIR* dir = ::opendir(QFile::encodeName(path));
+    if (dir) {  // krazy:exclude=syscalls
+        count = 0;
+        struct dirent *dirEntry = 0;
+        while ((dirEntry = ::readdir(dir))) {
+            if (dirEntry->d_name[0] == '.') {
+                if (dirEntry->d_name[1] == '\0' || !countHiddenFiles) {
+                    // Skip "." or hidden files
+                    continue;
+                }
+                if (dirEntry->d_name[1] == '.' && dirEntry->d_name[2] == '\0') {
+                    // Skip ".."
+                    continue;
+                }
+            }
+
+            // If only directories are counted, consider an unknown file type and links also
+            // as directory instead of trying to do an expensive stat()
+            // (see bugs 292642 and 299997).
+            const bool countEntry = !countDirectoriesOnly ||
+                                    dirEntry->d_type == DT_DIR ||
+                                    dirEntry->d_type == DT_LNK ||
+                                    dirEntry->d_type == DT_UNKNOWN;
+            if (countEntry) {
+                ++count;
+            }
+        }
+        ::closedir(dir);
+    }
+    return count;
+#endif
+}
+
+void KDirectoryContentsCounterWorker::countDirectoryContents(const QString& path, Options options)
+{
+    emit result(path, subItemsCount(path, options));
+}