Add proper board cleanup logic

There totally weren't any memory leaks before

gamestate.cpp

@@ -15,8 +15,8 @@ GameState::GameState(QObject *parent)
 
 void GameState::dealCards()
 {
-    // BUG: This causes a memory leak when called again
     qDebug() << "Dealing cards";
+    cleanupBoard(false);
 
     QList<PlayingCard*> deck = PlayingCard::createDeck();
 
@@ -45,14 +45,6 @@ void GameState::dealCards()
     assert(index == 28);
     m_drawPile = deck.mid(index);
 
-    // Reset the foundation & throwaway pile
-    m_throwawayPile.clear();
-    for (auto &column : m_foundation)
-        column.clear();
-
-    // Note that we don't need to reset gameWon from here, as it's
-    // auto-checked from onFoundationChanged, which the emits trigger
-
     emit drawPileChanged();
     emit throwawayPileChanged();
     emit columnsChanged();
@@ -63,6 +55,7 @@ void GameState::setupWinningDeck()
 {
     // BUG: This causes a memory leak when called again
     qDebug() << "Setting up a winning deck";
+    cleanupBoard(false);
 
     // Create a sorted deck of cards (4 suits, ordered)
     QList<PlayingCard*> deck = PlayingCard::createDeck();
@@ -379,6 +372,49 @@ void GameState::onFoundationChanged()
     emit gameWonChanged();
 }
 
+void GameState::cleanupBoard(bool emitChanges)
+{
+    // Clean up all PlayingCard objects in the draw pile
+    for (auto &card : m_drawPile) {
+        card->deleteLater();
+    }
+    m_drawPile.clear();
+
+    // Clean up all PlayingCard objects in the throwaway pile
+    for (auto &card : m_throwawayPile) {
+        card->deleteLater();
+    }
+    m_throwawayPile.clear();
+
+    // Clean up all PlayingCard objects in the foundation piles
+    for (auto &foundationPile : m_foundation) {
+        for (auto card : foundationPile)
+            card->deleteLater();
+        foundationPile.clear();
+    }
+
+    // Clean up all ColumnSlot objects in the columns
+    // alongside with the associated PlayingCard objects
+    // that they hold
+    for (auto &column : m_columns) {
+        for (auto slot : column) {
+            slot->card()->deleteLater();
+            slot->deleteLater();
+        }
+        column.clear();
+    }
+
+    // Note that we don't need to reset gameWon from here, as it's
+    // auto-checked from onFoundationChanged, which the emits trigger
+
+    if (emitChanges) {
+        emit drawPileChanged();
+        emit throwawayPileChanged();
+        emit foundationChanged();
+        emit columnsChanged();
+    }
+}
+
 bool GameState::tryAutoMoveSingleCard(PlayingCard &cardToMove, int skipColumnId)
 {
     // 1. Try moving the card to the foundation

gamestate.h

@@ -59,6 +59,8 @@ private:
     QList<QList<PlayingCard*>> m_foundation;
     bool m_gameWon;
 
+    void cleanupBoard(bool emitChanges);
+
     bool tryAutoMoveSingleCard(PlayingCard& cardToMove, int skipColumnId = -1);
     bool tryAutoMoveMultipleCards(const QList<PlayingCard*>& cards, int skipColumnId);