start working on gui

qt_gui/CMakeLists.txt

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+include_directories(${Qt5Widgets_INCLUDE_DIRS} ${QtQml_INCLUDE_DIRS})
+add_definitions(${Qt5Widgets_DEFINITIONS} ${QtQml_DEFINITIONS} ${${Qt5Quick_DEFINITIONS}})
+
+qt5_add_resources(QT_RESOURCES main.qrc)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Widgets_EXECUTABLE_COMPILE_FLAGS}")
+set(CMAKE_AUTOMOC ON)
+set(CMAKE_AUTORCC ON)
+set(CMAKE_AUTOUIC ON)
+set(PROJECT "RPN_Calculator")
+project(${PROJECT})
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Werror -std=c++11 -fstrict-aliasing -pedantic ")
+
+if(NOT DEFINED HEADERS)
+    file(GLOB HEADERS ${CMAKE_CURRENT_SOURCE_DIR}⁄*.h)
+endif()
+# if(NOT DEFINED SOURCES)
+#     file(GLOB SOURCES ${CMAKE_CURRENT_SOURCE_DIR}⁄*.cpp)
+# endif()
+source_group("Header Files" FILES ${HEADERS})
+# source_group("Source Files" FILES ${SOURCES})
+set(SOURCES main.cpp calculator.cpp)
+add_executable(${PROJECT} ${HEADERS} ${SOURCES} ${QT_RESOURCES})
+target_link_libraries(${PROJECT}
+    Qt5::Widgets
+    Qt5::Qml
+    Qt5::Quick
+    calc
+)

qt_gui/calculator.cpp

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+#include <QDebug>
+
+#include "calculator.h"
+
+Calculator::Calculator(QObject *parent) :
+	QObject(parent)
+{
+}
+
+void Calculator::buttonClicked(const QString& in) {
+	qDebug() << in;
+}

qt_gui/calculator.h

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+#ifndef QTGUI_CALCULATOR_H
+#define QTGUI_CALCULATOR_H
+
+#include <QObject>
+
+class Calculator : public QObject
+{
+	Q_OBJECT
+	
+public:
+	explicit Calculator(QObject *parent = 0);
+	
+public slots:
+	void buttonClicked(const QString& in);
+	
+};
+
+
+
+#endif //include guard

qt_gui/main.cpp

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+#include <QApplication>
+#include <QQmlApplicationEngine>
+#include <QQmlContext>
+#include "calculator.h"
+
+int main(int argc, char** argv)
+{
+	QApplication app(argc, argv);
+	QQmlApplicationEngine engine;
+	engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
+	
+	Calculator calculator;
+	engine.rootContext()->setContextProperty("_calculator", &calculator);
+	
+	return app.exec();
+}

qt_gui/main.qml

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+import QtQuick 2.0
+import QtQuick.Controls 1.0
+import Qt3D.Input 2.0
+
+ApplicationWindow
+{
+	visible: true
+	width:  1000
+	height: 1000
+	title: qsTr("RPN Calculator")
+	
+	//calculator
+	Column {
+		id: base;
+		spacing: 5;
+		width:  4 * (100 + 5)
+		height: 5 * (100 + 5) + 200
+		
+		//LCD
+		Rectangle {
+			id: lcd;
+			color: "gray"
+			width: 4 * (100 + 5) - 5
+			height: 200
+		}
+		
+		//Keyboard
+		Repeater {
+			model: 5;
+			//row
+			delegate: Row {
+				id: key_row;
+				spacing: 5;
+				//keys within row
+				Repeater {
+					model: 4;
+					delegate: Rectangle {
+						id: key_key;
+						width: 100;
+						height: 100;
+						color: "blue"
+						border { width: 1; color: "black" }
+						Text {
+							text: index
+							anchors.centerIn: parent
+						}
+						MouseHandler {
+							onClicked: _calculator.buttonClicked(index)
+						}
+					}
+				}
+			}
+		}
+	}
+}

qt_gui/main.qrc

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+<RCC>
+	<qresource prefix="/">
+		<file>main.qml</file>
+	</qresource>
+</RCC>