[filemanager] Add FileWatcher. Contributes to JB#41873

src/plugin/filewatcher.cpp

@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2018 Jolla Ltd.
+ * Contact: Joona Petrell <joona.petrell@jollamobile.com>
+ *
+ * You may use this file under the terms of the BSD license as follows:
+ *
+ * "Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Jolla Ltd. nor the names of its contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+ */
+
+#include "filewatcher.h"
+#include <QFile>
+#include <QFileInfo>
+#include <QFileSystemWatcher>
+#include <QQmlInfo>
+
+FileWatcher::FileWatcher(QObject *parent)
+    : QObject(parent)
+    , m_exists(false)
+    , m_file(new QFile(this))
+    , m_watcher(new QFileSystemWatcher(this))
+{
+    connect(m_watcher, SIGNAL(directoryChanged(QString)), this, SLOT(testFileExists()));
+}
+
+FileWatcher::~FileWatcher()
+{
+}
+
+void FileWatcher::testFileExists()
+{
+    bool exists = m_file->exists();
+    if (m_exists != exists) {
+        m_exists = exists;
+        emit existsChanged();
+    }
+}
+
+bool FileWatcher::exists() const
+{
+    return m_exists;
+}
+
+QString FileWatcher::fileName() const
+{
+    return m_file->fileName();
+}
+
+void FileWatcher::setFileName(const QString &fileName)
+{
+    if (m_file->fileName() != fileName) {
+        if (!m_file->fileName().isEmpty()) {
+            m_watcher->removePath(m_file->fileName());
+        }
+        m_file->setFileName(fileName);
+        if (!fileName.isEmpty()) {
+            QFileInfo fileInfo(fileName);
+            QString absolutePath = fileInfo.absolutePath();
+            if (!m_watcher->addPath(absolutePath)) {
+                qmlInfo(this) << "FileWatcher: watching folder " << absolutePath << " failed";
+            }
+        }
+        testFileExists();
+        emit fileNameChanged();
+    }
+}
+
+bool FileWatcher::testFileExists(const QString &fileName) const
+{
+    return QFile::exists(fileName);
+}

src/plugin/filewatcher.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2018 Jolla Ltd.
+ * Contact: Joona Petrell <joona.petrell@jollamobile.com>
+ *
+ * You may use this file under the terms of the BSD license as follows:
+ *
+ * "Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Jolla Ltd. nor the names of its contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+ */
+
+#ifndef FILEWATCHER_H
+#define FILEWATCHER_H
+
+#include <QObject>
+#include <QString>
+
+class QFileSystemWatcher;
+class QFile;
+
+class FileWatcher : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QString fileName READ fileName WRITE setFileName NOTIFY fileNameChanged)
+    Q_PROPERTY(bool exists READ exists NOTIFY existsChanged)
+
+public:
+    explicit FileWatcher(QObject *parent = 0);
+    ~FileWatcher();
+
+    bool exists() const;
+
+    QString fileName() const;
+    void setFileName(const QString &fileName);
+
+    Q_INVOKABLE bool testFileExists(const QString &fileName) const;
+
+signals:
+    void existsChanged();
+    void fileNameChanged();
+
+protected slots:
+    void testFileExists();
+
+private:
+    bool m_exists;
+    QFile *m_file;
+    QFileSystemWatcher *m_watcher;
+};
+
+#endif // FILEWATCHER_H

src/plugin/plugin.cpp

@@ -39,6 +39,7 @@
 #include "archivemodel.h"
 #include "fileengine.h"
 #include "filemodel.h"
+#include "filewatcher.h"
 
 static QObject *engine_api_factory(QQmlEngine *, QJSEngine *)
 {
@@ -63,6 +64,7 @@ class Q_DECL_EXPORT NemoFileManagerPlugin : public QQmlExtensionPlugin
         Q_ASSERT(uri == QLatin1String("Nemo.FileManager"));
         qmlRegisterType<FileModel>(uri, 1, 0, "FileModel");
         qmlRegisterType<Sailfish::ArchiveModel>("Nemo.FileManager", 1, 0, "ArchiveModel");
+        qmlRegisterType<FileWatcher>(uri, 1, 0, "FileWatcher");
         qmlRegisterSingletonType<FileEngine>(uri, 1, 0, "FileEngine", engine_api_factory);
 
         qRegisterMetaType<FileEngine::Error>("FileEngine::Error");

src/plugin/plugin.pro

@@ -35,6 +35,7 @@ SOURCES += archiveinfo.cpp \
     filemodel.cpp \
     fileoperations.cpp \
     fileoperationsproxy.cpp \
+    filewatcher.cpp \
     fileworker.cpp \
     plugin.cpp \
     statfileinfo.cpp
@@ -46,6 +47,7 @@ HEADERS += archiveinfo.h \
     filemodel.h \
     fileoperations.h \
     fileoperationsproxy.h \
+    filewatcher.h \
     fileworker.h \
     statfileinfo.h