Polish the new filesystembrowser example.

Introduce a special model that provides more information.
Replace numerical permissions column by a readable, ls-style
string and add size/date columns. On activation, launch
the file using Qt.openUrlExternally() with the local file
URL.

Change-Id: Ic0801e40cc3ad8498129da06670ba7e11bbf8003
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@theqtcompany.com>

2 files changed, 101 insertions, 2 deletions

diff --git a/examples/quick/controls/filesystembrowser/main.cpp b/examples/quick/controls/filesystembrowser/main.cpp
index e64a9a22..176d334c 100644
--- a/examples/quick/controls/filesystembrowser/main.cpp
+++ b/examples/quick/controls/filesystembrowser/main.cpp
@@ -42,13 +42,98 @@
 #include <QQmlApplicationEngine>
 #include <QtQml>
 #include <QFileSystemModel>
+#include <QDateTime>
+#include <QDesktopServices>
+#include <QUrl>
+
+static inline QString permissionString(const QFileInfo &fi)
+{
+    const QFile::Permissions permissions = fi.permissions();
+    QString result = QLatin1String("----------");
+    if (fi.isSymLink())
+        result[0] = QLatin1Char('l');
+    else if (fi.isDir())
+        result[0] = QLatin1Char('d');
+    if (permissions & QFileDevice::ReadUser)
+        result[1] = QLatin1Char('r');
+    if (permissions & QFileDevice::WriteUser)
+        result[2] = QLatin1Char('w');
+    if (permissions & QFileDevice::ExeUser)
+        result[3] = QLatin1Char('x');
+    if (permissions & QFileDevice::ReadGroup)
+        result[4] = QLatin1Char('r');
+    if (permissions & QFileDevice::WriteGroup)
+        result[5] = QLatin1Char('w');
+    if (permissions & QFileDevice::ExeGroup)
+        result[6] = QLatin1Char('x');
+    if (permissions & QFileDevice::ReadOther)
+        result[7] = QLatin1Char('r');
+    if (permissions & QFileDevice::WriteOther)
+        result[8] = QLatin1Char('w');
+    if (permissions & QFileDevice::ExeOther)
+        result[9] = QLatin1Char('x');
+    return result;
+}
+
+static inline QString sizeString(const QFileInfo &fi)
+{
+    if (!fi.isFile())
+        return QString();
+    const qint64 size = fi.size();
+    if (size > 1024 * 1024 * 10)
+        return QString::number(size / (1024 * 1024)) + QLatin1Char('M');
+    if (size > 1024 * 10)
+        return QString::number(size / 1024) + QLatin1Char('K');
+    return QString::number(size);
+}
+
+class DisplayFileSystemModel : public QFileSystemModel {
+public:
+    explicit DisplayFileSystemModel(QObject *parent = Q_NULLPTR)
+        : QFileSystemModel(parent) {}
+
+    enum  {
+        SizeRole = Qt::UserRole + 4,
+        DisplayableFilePermissionsRole = Qt::UserRole + 5,
+        LastModifiedRole = Qt::UserRole + 6,
+        UrlStringRole = Qt::UserRole + 7 // 263
+    };
+
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE
+    {
+        if (index.isValid() && role >= SizeRole) {
+            switch (role) {
+            case SizeRole:
+                return QVariant(sizeString(fileInfo(index)));
+            case DisplayableFilePermissionsRole:
+                return QVariant(permissionString(fileInfo(index)));
+            case LastModifiedRole:
+                return QVariant(fileInfo(index).lastModified().toString(Qt::SystemLocaleShortDate));
+            case UrlStringRole:
+                return QVariant(QUrl::fromLocalFile(filePath(index)).toString());
+            default:
+                break;
+            }
+        }
+        return QFileSystemModel::data(index, role);
+    }
+
+    QHash<int,QByteArray> roleNames() const Q_DECL_OVERRIDE
+    {
+         QHash<int, QByteArray> result = QFileSystemModel::roleNames();
+         result.insert(SizeRole, QByteArrayLiteral("size"));
+         result.insert(DisplayableFilePermissionsRole, QByteArrayLiteral("displayableFilePermissions"));
+         result.insert(LastModifiedRole, QByteArrayLiteral("lastModified"));
+         return result;
+    }
+};
 
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
 
     QQmlApplicationEngine engine;
-    QFileSystemModel *fsm = new QFileSystemModel(&engine);
+    QFileSystemModel *fsm = new DisplayFileSystemModel(&engine);
     fsm->setRootPath(QDir::homePath());
     fsm->setResolveSymlinks(true);
     engine.rootContext()->setContextProperty("fileSystemModel", fsm);
diff --git a/examples/quick/controls/filesystembrowser/main.qml b/examples/quick/controls/filesystembrowser/main.qml
index 454a9f31..abc3c20c 100644
--- a/examples/quick/controls/filesystembrowser/main.qml
+++ b/examples/quick/controls/filesystembrowser/main.qml
@@ -99,11 +99,25 @@ ApplicationWindow {
         }
 
         TableViewColumn {
+            title: "Size"
+            role: "size"
+            resizable: true
+            horizontalAlignment : Text.AlignRight
+        }
+
+        TableViewColumn {
             title: "Permissions"
-            role: "filePermissions"
+            role: "displayableFilePermissions"
+            resizable: true
+        }
+
+        TableViewColumn {
+            title: "Date Modified"
+            role: "lastModified"
             resizable: true
         }
 
         onDoubleClicked: isExpanded(index) ? collapse(index) : expand(index)
+        onActivated : Qt.openUrlExternally(fileSystemModel.data(index, 263))
     }
 }