Fix the size of the time elapsed and time remaining labels on the track slider, so they don't move the slider around while it's being dragged.

src/trackslider.cpp

@@ -10,10 +10,25 @@ TrackSlider::TrackSlider(QWidget* parent)
   ui_.elapsed->setFont(font);
   ui_.remaining->setFont(font);
 
+  UpdateLabelWidth();
+
   connect(ui_.slider, SIGNAL(sliderMoved(int)), SIGNAL(ValueChanged(int)));
   connect(ui_.slider, SIGNAL(valueChanged(int)), SLOT(ValueMaybeChanged(int)));
 }
 
+void TrackSlider::UpdateLabelWidth() {
+  // We set the label's minimum size so it won't resize itself when the user
+  // is dragging the slider.
+  QString old_text = ui_.elapsed->text();
+  ui_.elapsed->setText("0:00:00");
+  ui_.elapsed->setMinimumWidth(0);
+  int width = ui_.elapsed->sizeHint().width();
+  ui_.elapsed->setText(old_text);
+
+  ui_.elapsed->setMinimumWidth(width);
+  ui_.remaining->setMinimumWidth(width);
+}
+
 QSize TrackSlider::sizeHint() const {
   int width = 500;
   width += ui_.elapsed->sizeHint().width();
@@ -75,3 +90,13 @@ void TrackSlider::ValueMaybeChanged(int value) {
   UpdateTimes(value);
   emit ValueChanged(value);
 }
+
+bool TrackSlider::event(QEvent* e) {
+  switch (e->type()) {
+    case QEvent::ApplicationFontChange:
+    case QEvent::StyleChange:
+      UpdateLabelWidth();
+      break;
+  }
+  return false;
+}

src/trackslider.h

@@ -14,6 +14,9 @@ class TrackSlider : public QWidget {
   // QWidget
   QSize sizeHint() const;
 
+  // QObject
+  bool event(QEvent *);
+
   static QString PrettyTime(int seconds);
 
  public slots:
@@ -29,6 +32,7 @@ class TrackSlider : public QWidget {
 
  private:
   void UpdateTimes(int elapsed);
+  void UpdateLabelWidth();
 
  private:
   Ui::TrackSlider ui_;

src/trackslider.ui

@@ -25,6 +25,9 @@
      <property name="text">
       <string>0:00:00</string>
      </property>
+     <property name="alignment">
+      <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
+     </property>
     </widget>
    </item>
    <item>