From 710e5d87d285ac4d3123597fe012ba7951d6542f Mon Sep 17 00:00:00 2001
From: Samuel Fadel <samuelfadel@gmail.com>
Date: Thu, 11 Feb 2016 03:11:06 -0200
Subject: TransitionControl: only rewind when needed.

---
 transitioncontrol.cpp | 14 ++++++++++----
 transitioncontrol.h   |  2 ++
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/transitioncontrol.cpp b/transitioncontrol.cpp
index cf8f644..bd85405 100644
--- a/transitioncontrol.cpp
+++ b/transitioncontrol.cpp
@@ -11,6 +11,7 @@ static const Qt::MouseButton MOUSE_BUTTON = Qt::MiddleButton;
 TransitionControl::TransitionControl()
     : m_t(1.0)
     , m_startPos(-1)
+    , m_shouldRewind(false)
 {
 }
 
@@ -41,6 +42,7 @@ void TransitionControl::mouseMoveEvent(QMouseEvent *event)
         return;
     }
 
+    m_shouldRewind = true;
     m_t = double(x) / m_startPos;
     emit tChanged(m_t);
 }
@@ -54,8 +56,12 @@ void TransitionControl::mouseReleaseEvent(QMouseEvent *event)
     // Back to initial state
     m_startPos = -1;
 
-    // We now have to smoothly go back to m_t == 1.0
-    m_rewindThread = new RewindWorkerThread(this);
-    connect(m_rewindThread, &QThread::finished, m_rewindThread, &QObject::deleteLater);
-    m_rewindThread->start();
+    if (m_shouldRewind) {
+        m_shouldRewind = false;
+
+        // We now have to smoothly go back to m_t == 1.0
+        m_rewindThread = new RewindWorkerThread(this);
+        connect(m_rewindThread, &QThread::finished, m_rewindThread, &QObject::deleteLater);
+        m_rewindThread->start();
+    }
 }
diff --git a/transitioncontrol.h b/transitioncontrol.h
index ac84786..4c76e8c 100644
--- a/transitioncontrol.h
+++ b/transitioncontrol.h
@@ -34,6 +34,8 @@ private:
     // The x pos where interaction started
     int m_startPos;
 
+    bool m_shouldRewind;
+
     // Controls the smooth rewind transition
     QThread *m_rewindThread;
 };
-- 
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