From a39cccd05982c2ea9d00c4a73367d456a92c5a41 Mon Sep 17 00:00:00 2001
From: David Sansome <davidsansome@gmail.com>
Date: Mon, 21 Feb 2011 22:25:04 +0000
Subject: [PATCH] Update the track slider popup delta time when the track
 position changes.

---
 src/CMakeLists.txt                |  1 +
 src/widgets/tracksliderslider.cpp | 19 ++++++++++++++-----
 src/widgets/tracksliderslider.h   |  7 +++++++
 3 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a04dad315..795641171 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -422,6 +422,7 @@ set(HEADERS
   widgets/stretchheaderview.h
   widgets/trackslider.h
   widgets/tracksliderpopup.h
+  widgets/tracksliderslider.h
   widgets/widgetfadehelper.h
 )
 
diff --git a/src/widgets/tracksliderslider.cpp b/src/widgets/tracksliderslider.cpp
index 316c222cb..7c6779624 100644
--- a/src/widgets/tracksliderslider.cpp
+++ b/src/widgets/tracksliderslider.cpp
@@ -26,9 +26,12 @@
 
 TrackSliderSlider::TrackSliderSlider(QWidget* parent)
   : QSlider(parent),
-    popup_(new TrackSliderPopup(window()))
+    popup_(new TrackSliderPopup(window())),
+    mouse_hover_seconds_(0)
 {
   setMouseTracking(true);
+
+  connect(this, SIGNAL(valueChanged(int)), SLOT(UpdateDeltaTime()));
 }
 
 void TrackSliderSlider::mousePressEvent(QMouseEvent* e) {
@@ -71,13 +74,12 @@ void TrackSliderSlider::mouseMoveEvent(QMouseEvent* e) {
   int slider_min = gr.x();
   int slider_max = gr.right() - slider_length + 1;
 
-  int seconds = QStyle::sliderValueFromPosition(
+  mouse_hover_seconds_ = QStyle::sliderValueFromPosition(
       minimum(), maximum(), e->x() - slider_length/2 - slider_min + 1,
       slider_max - slider_min);
-  int delta_seconds = seconds - value();
 
-  popup_->SetText(Utilities::PrettyTime(seconds));
-  popup_->SetSmallText(Utilities::PrettyTimeDelta(delta_seconds));
+  popup_->SetText(Utilities::PrettyTime(mouse_hover_seconds_));
+  UpdateDeltaTime();
   popup_->SetPopupPosition(mapTo(window(), QPoint(
       e->x(), rect().center().y())));
 }
@@ -93,3 +95,10 @@ void TrackSliderSlider::leaveEvent(QEvent* e) {
   QSlider::leaveEvent(e);
   popup_->hide();
 }
+
+void TrackSliderSlider::UpdateDeltaTime() {
+  if (popup_->isVisible()) {
+    int delta_seconds = mouse_hover_seconds_ - value();
+    popup_->SetSmallText(Utilities::PrettyTimeDelta(delta_seconds));
+  }
+}
diff --git a/src/widgets/tracksliderslider.h b/src/widgets/tracksliderslider.h
index 190449afd..decaf1816 100644
--- a/src/widgets/tracksliderslider.h
+++ b/src/widgets/tracksliderslider.h
@@ -24,6 +24,8 @@ class TrackSliderPopup;
 
 // It's the slider inside the TrackSliderSlider
 class TrackSliderSlider : public QSlider {
+  Q_OBJECT
+
 public:
   TrackSliderSlider(QWidget* parent = 0);
 
@@ -34,8 +36,13 @@ protected:
   void enterEvent(QEvent*);
   void leaveEvent(QEvent*);
 
+private slots:
+  void UpdateDeltaTime();
+
 private:
   TrackSliderPopup* popup_;
+
+  int mouse_hover_seconds_;
 };
 
 #endif // TRACKSLIDERSLIDER_H