qt-material-widgets/source/component/qtmaterialautocomplete_internal.cpp

#include <QDebug>
#include <QMenu>
#include <QPropertyAnimation>
#include <QSignalTransition>

#include "qtmaterialautocomplete_internal.h"

#include <QtWidgets/QGraphicsOpacityEffect>

/*!
 *  \class QtMaterialAutoCompleteStateMachine
 *  \internal
 */

/*!
 *  \internal
 */
QtMaterialAutoCompleteStateMachine::QtMaterialAutoCompleteStateMachine(
    QWidget* menu)
    : QStateMachine(menu)
    , m_menu(menu)
    , m_closedState(new QState)
    , m_openState(new QState)
    , m_closingState(new QState)
{
  Q_ASSERT(menu);

  addState(m_closedState);
  addState(m_openState);
  addState(m_closingState);
  setInitialState(m_closedState);

  QSignalTransition* transition;

  transition = new QSignalTransition(this, SIGNAL(shouldOpen()));
  transition->setTargetState(m_openState);
  m_closedState->addTransition(transition);

  transition = new QSignalTransition(this, SIGNAL(shouldClose()));
  transition->setTargetState(m_closedState);
  m_openState->addTransition(transition);

  transition = new QSignalTransition(this, SIGNAL(shouldFade()));
  transition->setTargetState(m_closingState);
  m_openState->addTransition(transition);

  m_closedState->assignProperty(menu, "visible", false);
  m_openState->assignProperty(menu, "visible", true);

  QGraphicsOpacityEffect* effect = new QGraphicsOpacityEffect;
  menu->setGraphicsEffect(effect);

  m_openState->assignProperty(effect, "opacity", 1);
  m_closingState->assignProperty(effect, "opacity", 0);
  m_closedState->assignProperty(effect, "opacity", 0);

  QPropertyAnimation* animation;

  animation = new QPropertyAnimation(effect, "opacity", this);
  animation->setDuration(240);
  addDefaultAnimation(animation);

  transition = new QSignalTransition(animation, SIGNAL(finished()));
  transition->setTargetState(m_closedState);
  m_closingState->addTransition(transition);
}

/*!
 *  \internal
 */
QtMaterialAutoCompleteStateMachine::~QtMaterialAutoCompleteStateMachine() {}