Resolve "Simulate SFG"

Closes #22 (closed) and #24 (closed). This merge will:

• add some important test cases
• implement deep copying of SFG
• implement Simulation
• add Register operation
• refactor operation evaluation to allow for simulation of registers/delays with loops and nested SFGs
• refactor neighbors/parameter/traverse interface by moving it to GraphComponent
• add some convenience functions to Operation
• tidy up the method signatures of some interfaces to be more general
• move bit length specification from InputPort to Signal
• add customization point for specifying input truncation behavior for user operations

GUI/main_window.py

+"""@package docstring
+B-ASIC GUI Module.
+This python file is an example of how a GUI can be implemented
+using buttons and textboxes.
+"""
+
+import sys
+
+from PyQt5.QtWidgets import QApplication, QWidget, QMainWindow, QLabel, QAction,\
+QStatusBar, QMenuBar, QLineEdit, QPushButton
+from PyQt5.QtCore import Qt
+from PyQt5.QtGui import QIcon, QFont, QPainter, QPen
+
+
+class DragButton(QPushButton):
+    """How to create a dragbutton"""
+    def mousePressEvent(self, event):
+        self._mouse_press_pos = None
+        self._mouse_move_pos = None
+        if event.button() == Qt.LeftButton:
+            self._mouse_press_pos = event.globalPos()
+            self._mouse_move_pos = event.globalPos()
+
+        super(DragButton, self).mousePressEvent(event)
+
+    def mouseMoveEvent(self, event):
+        if event.buttons() == Qt.LeftButton:
+            cur_pos = self.mapToGlobal(self.pos())
+            global_pos = event.globalPos()
+            diff = global_pos - self._mouse_move_pos
+            new_pos = self.mapFromGlobal(cur_pos + diff)
+            self.move(new_pos)
+
+            self._mouse_move_pos = global_pos
+
+        super(DragButton, self).mouseMoveEvent(event)
+
+    def mouseReleaseEvent(self, event):
+        if self._mouse_press_pos is not None:
+            moved = event.globalPos() - self._mouse_press_pos
+            if moved.manhattanLength() > 3:
+                event.ignore()
+                return
+
+        super(DragButton, self).mouseReleaseEvent(event)
+
+class SubWindow(QWidget):
+    """Creates a sub window """
+    def create_window(self, window_width, window_height):
+        """Creates a window
+        """
+        parent = None
+        super(SubWindow, self).__init__(parent)
+        self.setWindowFlags(Qt.WindowStaysOnTopHint)
+        self.resize(window_width, window_height)
+
+class MainWindow(QMainWindow):
+    """Main window for the program"""
+    def __init__(self, *args, **kwargs):
+        super(MainWindow, self).__init__(*args, **kwargs)
+
+        self.setWindowTitle(" ")
+        self.setWindowIcon(QIcon('small_logo.png'))
+
+        # Menu buttons
+        test_button = QAction("Test", self)
+
+        exit_button = QAction("Exit", self)
+        exit_button.setShortcut("Ctrl+Q")
+        exit_button.triggered.connect(self.exit_app)
+
+        edit_button = QAction("Edit", self)
+        edit_button.setStatusTip("Open edit menu")
+        edit_button.triggered.connect(self.on_edit_button_click)
+
+        view_button = QAction("View", self)
+        view_button.setStatusTip("Open view menu")
+        view_button.triggered.connect(self.on_view_button_click)
+
+        menu_bar = QMenuBar()
+        menu_bar.setStyleSheet("background-color:rgb(222, 222, 222)")
+        self.setMenuBar(menu_bar)
+
+        file_menu = menu_bar.addMenu("&File")
+        file_menu.addAction(exit_button)
+        file_menu.addSeparator()
+        file_menu.addAction(test_button)
+
+        edit_menu = menu_bar.addMenu("&Edit")
+        edit_menu.addAction(edit_button)
+
+        edit_menu.addSeparator()
+
+        view_menu = menu_bar.addMenu("&View")
+        view_menu.addAction(view_button)
+
+        self.setStatusBar(QStatusBar(self))
+
+    def on_file_button_click(self):
+        print("File")
+
+    def on_edit_button_click(self):
+        print("Edit")
+
+    def on_view_button_click(self):
+        print("View")
+
+    def exit_app(self, checked):
+        QApplication.quit()
+
+    def clicked(self):
+        print("Drag button clicked")
+
+    def add_drag_buttons(self):
+        """Adds draggable buttons"""
+        addition_button = DragButton("Addition", self)
+        addition_button.move(10, 130)
+        addition_button.setFixedSize(70, 20)
+        addition_button.clicked.connect(self.create_sub_window)
+
+        addition_button2 = DragButton("Addition", self)
+        addition_button2.move(10, 130)
+        addition_button2.setFixedSize(70, 20)
+        addition_button2.clicked.connect(self.create_sub_window)
+
+        subtraction_button = DragButton("Subtraction", self)
+        subtraction_button.move(10, 170)
+        subtraction_button.setFixedSize(70, 20)
+        subtraction_button.clicked.connect(self.create_sub_window)
+
+        subtraction_button2 = DragButton("Subtraction", self)
+        subtraction_button2.move(10, 170)
+        subtraction_button2.setFixedSize(70, 20)
+        subtraction_button2.clicked.connect(self.create_sub_window)
+
+        multiplication_button = DragButton("Multiplication", self)
+        multiplication_button.move(10, 210)
+        multiplication_button.setFixedSize(70, 20)
+        multiplication_button.clicked.connect(self.create_sub_window)
+
+        multiplication_button2 = DragButton("Multiplication", self)
+        multiplication_button2.move(10, 210)
+        multiplication_button2.setFixedSize(70, 20)
+        multiplication_button2.clicked.connect(self.create_sub_window)
+
+    def paintEvent(self, e):
+        # Temporary black box for operations
+        painter = QPainter(self)
+        painter.setPen(QPen(Qt.black, 5, Qt.SolidLine))
+        painter.drawRect(0, 110, 100, 400)
+
+        # Temporary arrow resembling a signal
+        painter.setRenderHint(QPainter.Antialiasing)
+        painter.setPen(Qt.black)
+        painter.setBrush(Qt.white)
+        painter.drawLine(300, 200, 400, 200)
+        painter.drawLine(400, 200, 395, 195)
+        painter.drawLine(400, 200, 395, 205)
+
+    def create_sub_window(self):
+        """ Example of how to create a sub window
+        """
+        self.sub_window = SubWindow()
+        self.sub_window.create_window(400, 300)
+        self.sub_window.setWindowTitle("Properties")
+
+        self.sub_window.properties_label = QLabel(self.sub_window)
+        self.sub_window.properties_label.setText('Properties')
+        self.sub_window.properties_label.setFixedWidth(400)
+        self.sub_window.properties_label.setFont(QFont('SansSerif', 14, QFont.Bold))
+        self.sub_window.properties_label.setAlignment(Qt.AlignCenter)
+
+        self.sub_window.name_label = QLabel(self.sub_window)
+        self.sub_window.name_label.setText('Name:')
+        self.sub_window.name_label.move(20, 40)
+
+        self.sub_window.name_line = QLineEdit(self.sub_window)
+        self.sub_window.name_line.setPlaceholderText("Write a name here")
+        self.sub_window.name_line.move(70, 40)
+        self.sub_window.name_line.resize(100, 20)
+
+        self.sub_window.id_label = QLabel(self.sub_window)
+        self.sub_window.id_label.setText('Id:')
+        self.sub_window.id_label.move(20, 70)
+
+        self.sub_window.id_line = QLineEdit(self.sub_window)
+        self.sub_window.id_line.setPlaceholderText("Write an id here")
+        self.sub_window.id_line.move(70, 70)
+        self.sub_window.id_line.resize(100, 20)
+
+        self.sub_window.show()
+
+
+if __name__ == "__main__":
+    app = QApplication(sys.argv)
+    window = MainWindow()
+    window.add_drag_buttons()
+    window.resize(960, 720)
+    window.show()
+    app.exec_()