From 1c4056e17acbb11fe88cde59b269fc533df0e892 Mon Sep 17 00:00:00 2001
From: Maciej Suminski <maciej.suminski@cern.ch>
Date: Thu, 23 Nov 2017 13:35:03 +0100
Subject: [PATCH] TEXT_CTRL_EVAL: wxTextCtrl wrapper supporting math expression
 evaluation

---
 common/CMakeLists.txt             |  1 +
 common/widgets/text_ctrl_eval.cpp | 59 +++++++++++++++++++++++++++++++
 include/widgets/text_ctrl_eval.h  | 59 +++++++++++++++++++++++++++++++
 3 files changed, 119 insertions(+)
 create mode 100644 common/widgets/text_ctrl_eval.cpp
 create mode 100644 include/widgets/text_ctrl_eval.h

diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index d5b2bee81d..f4ff414696 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -178,6 +178,7 @@ set( COMMON_WIDGET_SRCS
     widgets/footprint_select_widget.cpp
     widgets/footprint_choice.cpp
     widgets/indicator_icon.cpp
+    widgets/text_ctrl_eval.cpp
     widgets/unit_binder.cpp
     )
 
diff --git a/common/widgets/text_ctrl_eval.cpp b/common/widgets/text_ctrl_eval.cpp
new file mode 100644
index 0000000000..04c6059847
--- /dev/null
+++ b/common/widgets/text_ctrl_eval.cpp
@@ -0,0 +1,59 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2017 CERN
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-3.0.html
+ * or you may search the http://www.gnu.org website for the version 3 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#include <widgets/text_ctrl_eval.h>
+
+TEXT_CTRL_EVAL::TEXT_CTRL_EVAL( wxWindow* aParent, wxWindowID aId, const
+        wxString& aValue, const wxPoint& aPos, const wxSize& aSize, long aStyle,
+        const wxValidator& aValidator, const wxString& aName )
+    : wxTextCtrl( aParent, aId, aValue, aPos, aSize, aStyle, aValidator, aName )
+{
+    Connect( wxEVT_SET_FOCUS,
+            wxFocusEventHandler( TEXT_CTRL_EVAL::onTextFocusGet ), NULL, this );
+    Connect( wxEVT_KILL_FOCUS,
+            wxFocusEventHandler( TEXT_CTRL_EVAL::onTextFocusLost ), NULL, this );
+}
+
+
+void TEXT_CTRL_EVAL::onTextFocusGet( wxFocusEvent& aEvent )
+{
+    auto oldStr = m_eval.textInput( this );
+
+    if( oldStr )
+        SetValue( wxString::FromUTF8( oldStr ) );
+
+    aEvent.Skip();
+}
+
+
+void TEXT_CTRL_EVAL::onTextFocusLost( wxFocusEvent& aEvent )
+{
+    if( GetValue().IsEmpty() )
+        SetValue( "0" );
+
+    if( m_eval.process( GetValue().mb_str(), this ) )
+        SetValue( wxString::FromUTF8( m_eval.result() ) );
+
+    aEvent.Skip();
+}
diff --git a/include/widgets/text_ctrl_eval.h b/include/widgets/text_ctrl_eval.h
new file mode 100644
index 0000000000..7f99330213
--- /dev/null
+++ b/include/widgets/text_ctrl_eval.h
@@ -0,0 +1,59 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2017 CERN
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-3.0.html
+ * or you may search the http://www.gnu.org website for the version 3 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef TEXT_CTRL_EVAL_H
+#define TEXT_CTRL_EVAL_H
+
+#include <wx/window.h>
+#include <wx/textctrl.h>
+#include <libeval/numeric_evaluator.h>
+
+/**
+ * @brief wxTextCtrl wrapper to handle math expression evaluation.
+ * Expressions are evaluated after the text control loses the focus. If user decides to modify
+ * the expression, he will get the original expression to modify.
+ */
+
+class TEXT_CTRL_EVAL : public wxTextCtrl
+{
+public:
+    TEXT_CTRL_EVAL( wxWindow* aParent, wxWindowID aId, const wxString& aValue = wxEmptyString,
+            const wxPoint& aPos = wxDefaultPosition, const wxSize& aSize = wxDefaultSize,
+            long aStyle = 0, const wxValidator& aValidator = wxDefaultValidator,
+            const wxString& aName = wxTextCtrlNameStr );
+
+    virtual ~TEXT_CTRL_EVAL()
+    {
+    }
+
+protected:
+    ///> Numeric expression evaluator
+    NumericEvaluator m_eval;
+
+    void onTextFocusGet( wxFocusEvent& aEvent );
+    void onTextFocusLost( wxFocusEvent& aEvent );
+};
+
+
+#endif /* TEXT_CTRL_EVAL_H */