Filesystem Explorer Example: Introduce version 2

This updated version addresses several bugs and misbehaviors that were
identified in the previous version. I have rewritten and improved
various aspects of the application to provide a more stable and reliable
user experience.
Here are some of the key changes and enhancements in version 2:

  - Fix qmllint warnings.
  - Reduce the number of redundant items
  - Apply the custom window decorations inside MyMenuBar
    to the contentItem instead of the background to scale
    properly.
  - Fix additional scaling and UI misbehaviors

  - Add an application icon
  - Add an editor with line numbers
  - Add command line options to specify an initial directory
  - Since rootIndex is exposed inside TreeView since 6.6
    this is an excellent opportunity to make use of it
  - Crosslink the python version of this example in the docs

Pick-to: 6.6
Change-Id: Ib816a95f843b3f4b84b11db893facda0ffc6f482
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

1 files changed, 21 insertions, 3 deletions

diff --git a/examples/quickcontrols/filesystemexplorer/filesystemmodel.h b/examples/quickcontrols/filesystemexplorer/filesystemmodel.h
index 24f3d658b2..c79af4aa82 100644
--- a/examples/quickcontrols/filesystemexplorer/filesystemmodel.h
+++ b/examples/quickcontrols/filesystemexplorer/filesystemmodel.h
@@ -5,18 +5,36 @@
 #define FILESYSTEMMODEL_H
 
 #include <QFileSystemModel>
-#include <QtQml/qqml.h>
+#include <QQuickTextDocument>
 
 class FileSystemModel : public QFileSystemModel
 {
     Q_OBJECT
     QML_ELEMENT
     QML_SINGLETON
-
+    Q_PROPERTY(QModelIndex rootIndex READ rootIndex WRITE setRootIndex NOTIFY rootIndexChanged)
 public:
     explicit FileSystemModel(QObject *parent = nullptr);
-    int columnCount(const QModelIndex &parent) const override;
+
+    // Functions invokable from QML
     Q_INVOKABLE QString readFile(const QString &filePath);
+    Q_INVOKABLE int currentLineNumber(QQuickTextDocument *textDocument, int cursorPosition);
+
+    // Overridden functions
+    int columnCount(const QModelIndex &parent) const override;
+
+    // Member functions from here
+    QModelIndex rootIndex() const;
+    void setRootIndex(const QModelIndex index);
+    void setInitialDirectory(const QString &path = getDefaultRootDir());
+
+    static QString getDefaultRootDir();
+
+signals:
+    void rootIndexChanged();
+
+private:
+    QModelIndex m_rootIndex;
 };
 
 #endif