Add saveable labels for parts and connectors

Label.cpp

@@ -1,6 +1,68 @@
 #include "Label.h"
 
-Label::Label()
-{
+#include <QKeyEvent>
+#include <QGraphicsScene>
 
+Label::Label(QGraphicsItem* parent)
+    :m_parentItem(parent)
+{
+    // TODO: Find out why I have to call setParentItem each time in recalculateTextAlignment
+    //setParentItem((QGraphicsItem*)m_parent);
+    if(parent->scene() != nullptr)
+        parent->scene()->addItem(this);
+}
+
+void Label::setEditable(bool value)
+{
+    if(value)
+        setTextInteractionFlags(Qt::TextInteractionFlag::TextEditorInteraction);
+    else
+        setTextInteractionFlags(Qt::TextInteractionFlag::NoTextInteraction);
+}
+
+void Label::setText(const QString& text)
+{
+    setPlainText(text);
+    recalculateTextAlignment();
+}
+
+QString Label::text() const
+{
+    return toPlainText();
+}
+
+void Label::alignText(QPointF anchorPos, AlignMode::AlignMode mode)
+{
+    m_textAnchor = anchorPos;
+    m_alignMode = mode;
+    recalculateTextAlignment();
+}
+
+void Label::keyPressEvent(QKeyEvent* event)
+{
+    QGraphicsTextItem::keyPressEvent(event);
+
+    if(event->isAccepted())
+        recalculateTextAlignment();
+}
+
+void Label::recalculateTextAlignment()
+{
+    setParentItem(m_parentItem);
+
+    if(m_alignMode & AlignMode::Right)
+        setX( - boundingRect().width());
+    else if(m_alignMode & AlignMode::HCenter)
+        setX( - boundingRect().width() / 2.f);
+    else //usually if(m_alignMode & AlignMode::Left)
+        setX(0);
+
+    if(m_alignMode & AlignMode::Bottom)
+        setY( - boundingRect().height());
+    else if(m_alignMode & AlignMode::VCenter)
+        setY( - boundingRect().height() / 2.f);
+    else //usually if(m_alignMode & AlignMode::Top)
+        setY(0);
+
+    moveBy(m_textAnchor.x(), m_textAnchor.y());
 }