Added screen slide timer

* Added screen slide timer
  * Added so that the animation becomes interruptible.

1 files changed, 86 insertions, 0 deletions

diff --git a/src/screenslidetimer.cpp b/src/screenslidetimer.cpp
new file mode 100644
index 00000000..2bfd0cd5
--- /dev/null
+++ b/src/screenslidetimer.cpp
@@ -0,0 +1,86 @@
+#include "screenslidetimer.h"
+
+#include <QDebug>
+
+namespace kal
+{
+ScreenSlideTimer::ScreenSlideTimer(QObject *parent)
+    : QObject(parent)
+{
+  m_pause = new QTimer(this);
+  m_pause->setInterval(TRANSITION_BOOKEND_DELAY);
+  m_pause->setSingleShot(true);
+
+  m_group = new QParallelAnimationGroup(this);
+
+  connect(m_pause, &QTimer::timeout, this, &ScreenSlideTimer::startNextState);
+  connect(m_group, &QParallelAnimationGroup::finished, this, &ScreenSlideTimer::startNextState);
+}
+
+ScreenSlideTimer::~ScreenSlideTimer()
+{
+  m_group->disconnect(this);
+  m_pause->disconnect(this);
+  stop();
+}
+
+void ScreenSlideTimer::addAnimation(QAbstractAnimation *animation)
+{
+  if (m_running)
+  {
+    qWarning() << "Cannot add animations while transition is in progress";
+    return;
+  }
+  m_group->addAnimation(animation);
+}
+
+void ScreenSlideTimer::start()
+{
+  if (m_running)
+  {
+    qWarning() << "Transition already in progress";
+    return;
+  }
+  m_running = true;
+  startNextState();
+}
+
+void ScreenSlideTimer::stop()
+{
+  if (m_running)
+  {
+    m_running = false;
+    m_state = NoTransition;
+    m_group->stop();
+    m_group->clear();
+    m_pause->stop();
+  }
+}
+
+void ScreenSlideTimer::startNextState()
+{
+  switch (m_state)
+  {
+  case NoTransition:
+    m_state = PreTransition;
+    Q_EMIT started();
+    m_pause->start();
+    return;
+
+  case PreTransition:
+    m_state = GroupTransition;
+    m_group->start();
+    break;
+
+  case GroupTransition:
+    m_state = PostTransition;
+    m_pause->start();
+    break;
+
+  case PostTransition:
+    stop();
+    Q_EMIT finished();
+    break;
+  }
+}
+} // namespace kal