From 320bae9a2d3a16bfde20a050bf079703c44e7fd7 Mon Sep 17 00:00:00 2001
From: Klaus Basan <klaus.basan@klausbasan.de>
Date: Sat, 13 Apr 2019 03:44:51 +0200
Subject: [PATCH] Ref T599, event filter for uc characters

---
 src/blackgui/eventfilter.cpp | 45 ++++++++++++++++++++++++++++++++++++
 src/blackgui/eventfilter.h   | 32 +++++++++++++++++++++++++
 2 files changed, 77 insertions(+)
 create mode 100644 src/blackgui/eventfilter.cpp
 create mode 100644 src/blackgui/eventfilter.h

diff --git a/src/blackgui/eventfilter.cpp b/src/blackgui/eventfilter.cpp
new file mode 100644
index 000000000..52d9b2384
--- /dev/null
+++ b/src/blackgui/eventfilter.cpp
@@ -0,0 +1,45 @@
+/* Copyright (C) 2019
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
+ * or distributed except according to the terms contained in the LICENSE file.
+ */
+
+#include "eventfilter.h"
+#include "blackmisc/stringutils.h"
+
+#include <QKeyEvent>
+#include <QPlainTextEdit>
+
+namespace BlackGui
+{
+    bool CUpperCaseEventFilter::eventFilter(QObject *object, QEvent *event)
+    {
+        if (event->type() == QEvent::KeyPress)
+        {
+            if (QKeyEvent *e = dynamic_cast<QKeyEvent *>(event))
+            {
+                // If QKeyEvent::text() returns an empty QString then let normal
+                // processing proceed as it may be a control (e.g. cursor movement)
+                // key.  Otherwise convert the text to upper case and insert it at
+                // the current cursor position.
+                if (e->text().length() == 1)
+                {
+                    QPlainTextEdit *pte = qobject_cast<QPlainTextEdit *>(object);
+                    if (!pte) { return false; }
+
+                    const QChar c = e->text().front();
+                    if (!c.isLower())  { return false; }
+                    if (!c.isLetter()) { return false; }
+
+                    pte->insertPlainText(e->text().toUpper());
+
+                    // return true to prevent further processing
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+} // namespace
diff --git a/src/blackgui/eventfilter.h b/src/blackgui/eventfilter.h
new file mode 100644
index 000000000..35367a66f
--- /dev/null
+++ b/src/blackgui/eventfilter.h
@@ -0,0 +1,32 @@
+/* Copyright (C) 2019
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
+ * or distributed except according to the terms contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKGUI_EVENTFILTER_H
+#define BLACKGUI_EVENTFILTER_H
+
+#include <QObject>
+
+namespace BlackGui
+{
+    //! Uppercase key press
+    class CUpperCaseEventFilter : public QObject
+    {
+        Q_OBJECT
+
+    public:
+        using QObject::QObject;
+
+    protected:
+        //! Filter
+        bool eventFilter(QObject *object, QEvent *event);
+    };
+} // namespace
+
+#endif // guard