democompositor: Add method to scan and watch a directory

This will add files of a given directory and use a QFileSystemWatcher
to check for changes and then re-scan it. It will return if the watching
has started.

Change-Id: I4d5021430fa400c648167fea37c45d7472ceb322
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>

2 files changed, 20 insertions, 0 deletions

diff --git a/wayland/democompositor/apps/applistmodel.cpp b/wayland/democompositor/apps/applistmodel.cpp
index 10c4c15..8602588 100644
--- a/wayland/democompositor/apps/applistmodel.cpp
+++ b/wayland/democompositor/apps/applistmodel.cpp
@@ -53,6 +53,7 @@
 #include "applog.h"
 
 #include <QtCore/QDirIterator>
+#include <QtCore/QFileSystemWatcher>
 
 static QHash<int, QByteArray> modelRoles()
 {
@@ -111,6 +112,23 @@ QHash<int, QByteArray> AppListModel::roleNames() const
     return m_roles;
 }
 
+/*!
+ * Returns true if the directory can be watched
+ *
+ * Parse all JSON application files from the given directory
+ * and monitor it for changes.
+ */
+bool AppListModel::addAndWatchDir(const QString& dirName)
+{
+    auto watcher = new QFileSystemWatcher(this);
+    connect(watcher, &QFileSystemWatcher::directoryChanged, this, &AppListModel::addDir);
+    auto res = watcher->addPath(dirName);
+    addDir(dirName);
+
+    qCDebug(apps) << "addAndWatchDir" << dirName << "result: " << res;
+    return res;
+}
+
 void AppListModel::addFile(const QString& fileName)
 {
     beginResetModel();
diff --git a/wayland/democompositor/apps/applistmodel.h b/wayland/democompositor/apps/applistmodel.h
index 1cd79b4..b177ece 100644
--- a/wayland/democompositor/apps/applistmodel.h
+++ b/wayland/democompositor/apps/applistmodel.h
@@ -79,6 +79,8 @@ public:
     QHash<int, QByteArray> roleNames() const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
+    bool addAndWatchDir(const QString& dirName);
+
     void addFile(const QString& fileName);
     void addDir(const QString& dirName);