Make piece shadow creation feel more responsive.

svn path=/trunk/KDE/kdegames/palapeli/; revision=1111399

src/engine/piece.cpp

@@ -201,8 +201,7 @@ void Palapeli::Piece::doMove()
 	if (scene)
 	{
 		scene->validatePiecePosition(this);
-		//TODO: savegame is updated multiple times at once when multiple pieces are moved
-		scene->updateSavegame();
+		scene->invalidateSavegame();
 	}
 }
 

src/engine/scene.cpp

@@ -42,8 +42,12 @@ Palapeli::Scene::Scene(QObject* parent)
 	: QGraphicsScene(parent)
 	, m_constrained(false)
 	, m_constraintVisualizer(new Palapeli::ConstraintVisualizer(this))
+	, m_savegameTimer(new QTimer(this))
 	, m_loadingPuzzle(false)
 {
+	m_savegameTimer->setInterval(500); //write savegame twice per second at most
+	m_savegameTimer->setSingleShot(true);
+	connect(m_savegameTimer, SIGNAL(timeout()), this, SLOT(updateSavegame()));
 	connect(&m_metadataLoader, SIGNAL(finished()), this, SLOT(continueLoading()));
 }
 
@@ -332,10 +336,16 @@ void Palapeli::Scene::pieceMoved()
 			mergeCandidates << piece;
 	}
 	searchConnections(mergeCandidates);
-	updateSavegame();
+	invalidateSavegame();
 	emit reportProgress(m_atomicPieceCount, m_pieces.count());
 }
 
+void Palapeli::Scene::invalidateSavegame()
+{
+	if (!m_savegameTimer->isActive())
+		m_savegameTimer->start();
+}
+
 void Palapeli::Scene::updateSavegame()
 {
 	//save piece positions

src/engine/scene.h

@@ -48,7 +48,7 @@ namespace Palapeli
 			void loadPuzzle(const QModelIndex& index);
 			void restartPuzzle();
 			void setConstrained(bool constrained);
-			void updateSavegame();
+			void invalidateSavegame();
 		Q_SIGNALS:
 			void constrainedChanged(bool constrained);
 			void puzzleStarted();
@@ -57,6 +57,7 @@ namespace Palapeli
 		private Q_SLOTS:
 			void pieceMoved();
 			void pieceInstanceTransaction(const QList<Palapeli::Piece*>& deletedPieces, const QList<Palapeli::Piece*>& createdPieces);
+			void updateSavegame();
 			void playVictoryAnimation();
 			void playVictoryAnimation2();
 			void playVictoryAnimation3();
@@ -77,6 +78,7 @@ namespace Palapeli
 			QString m_identifier;
 			QPointer<Palapeli::Puzzle> m_puzzle;
 			QList<Palapeli::Piece*> m_pieces;
+			QTimer* m_savegameTimer;
 			int m_atomicPieceCount;
 			//some stuff needed for loading puzzles
 			bool m_loadingPuzzle;