board: fix: place tile no longer drawn when mouse is outside board

client/src/board/boardareawidget.cpp

@@ -139,6 +139,15 @@ TileLocation BoardAreaWidget::pointToTileLocation(const QPoint& p)
   return TileLocation{static_cast<int16_t>(p.x() / pxPerTile), static_cast<int16_t>(p.y() / pxPerTile)};
 }
 
+void BoardAreaWidget::leaveEvent(QEvent* event)
+{
+  m_mouseMoveTileLocation = TileLocation::invalid;
+  emit mouseTileLocationChanged(m_mouseMoveTileLocation.x, m_mouseMoveTileLocation.y);
+  if(m_mouseMoveTileId != TileId::None)
+    update();
+  QWidget::leaveEvent(event);
+}
+
 void BoardAreaWidget::keyPressEvent(QKeyEvent* event)
 {
   if(event->key() == Qt::Key_G && event->modifiers() == Qt::ControlModifier)
@@ -313,7 +322,7 @@ void BoardAreaWidget::paintEvent(QPaintEvent* event)
 
   painter.restore();
 
-  if(m_mouseMoveTileId != TileId::None)
+  if(m_mouseMoveTileId != TileId::None && m_mouseMoveTileLocation.isValid())
   {
     const QRectF r = tileRect(m_mouseMoveTileLocation, 1, 1, tileSize);
     painter.fillRect(r, backgroundColor50);

client/src/board/boardareawidget.hpp

@@ -63,6 +63,7 @@ class BoardAreaWidget : public QWidget
     SignalAspect getSignalAspect(const TileLocation& l) const;
     TileLocation pointToTileLocation(const QPoint& p);
 
+    void leaveEvent(QEvent *event) final;
     void keyPressEvent(QKeyEvent* event) final;
     void mousePressEvent(QMouseEvent* event) final;
     void mouseReleaseEvent(QMouseEvent* event) final;

client/src/board/boardwidget.cpp

@@ -262,7 +262,10 @@ BoardWidget::BoardWidget(std::shared_ptr<Board> object, QWidget* parent) :
   connect(m_boardArea, &BoardAreaWidget::mouseTileLocationChanged, this,
     [this](int16_t x, int16_t y)
     {
-      m_statusBarCoords->setText(QString::number(x) + ", " + QString::number(y));
+      if(TileLocation{x, y}.isValid())
+        m_statusBarCoords->setText(QString::number(x) + ", " + QString::number(y));
+      else
+        m_statusBarCoords->setText("");
     });
 
   gridChanged(m_boardArea->grid());

shared/src/traintastic/board/tilelocation.hpp

@@ -24,12 +24,20 @@
 #define TRAINTASTIC_SHARED_TRAINTASTIC_BOARD_TILELOCATION_HPP
 
 #include <functional>
+#include <limits>
 
 struct TileLocation
 {
+  static const TileLocation invalid;
+
   int16_t x;
   int16_t y;
 
+  bool isValid() const
+  {
+    return *this != invalid;
+  }
+
   bool operator ==(const TileLocation& other) const
   {
     return x == other.x && y == other.y;
@@ -41,6 +49,8 @@ struct TileLocation
   }
 };
 
+inline const TileLocation TileLocation::invalid{std::numeric_limits<int16_t>::min(), std::numeric_limits<int16_t>::min()};
+
 struct TileLocationHash
 {
   std::size_t operator()(const TileLocation& key) const