Implement fade effect for Auto Complete

components/qtmaterialautocomplete.cpp

@@ -4,6 +4,7 @@
 #include <QtWidgets/QVBoxLayout>
 #include <QEvent>
 #include <QTimer>
+#include <QDebug>
 #include "qtmaterialautocomplete_internal.h"
 #include "qtmaterialflatbutton.h"
 
@@ -34,8 +35,8 @@ void QtMaterialAutoCompletePrivate::init()
 {
     Q_Q(QtMaterialAutoComplete);
 
-    stateMachine = new QtMaterialAutoCompleteStateMachine(q);
     menu         = new QWidget;
+    stateMachine = new QtMaterialAutoCompleteStateMachine(menu);
     menuLayout   = new QVBoxLayout;
     maxWidth     = 0;
 
@@ -46,7 +47,9 @@ void QtMaterialAutoCompletePrivate::init()
     effect->setColor(QColor(0, 0, 0, 50));
     effect->setOffset(0, 3);
 
-    menu->setGraphicsEffect(effect);
+    // create a box with geometry identical to menu, and then apply effect to it
+    //menu->setGraphicsEffect(effect);
+
     menu->setLayout(menuLayout);
     menu->setVisible(false);
 
@@ -137,9 +140,9 @@ void QtMaterialAutoComplete::updateResults(QString text)
     }
 
     if (!results.count()) {
-        d->menu->hide();
-    } else if (d->menu->isHidden()) {
-        d->menu->show();
+        emit d->stateMachine->shouldClose();
+    } else {
+        emit d->stateMachine->shouldOpen();
     }
 
     d->menu->setFixedHeight(results.length()*50);
@@ -178,9 +181,7 @@ bool QtMaterialAutoComplete::eventFilter(QObject *watched, QEvent *event)
     switch (event->type())
     {
     case QEvent::MouseButtonPress: {
-        QTimer::singleShot(300, this, [=](){
-            d->menu->hide();
-        });
+        emit d->stateMachine->shouldFade();
         QtMaterialFlatButton *widget;
         if ((widget = static_cast<QtMaterialFlatButton *>(watched))) {
             QString text(widget->text());

components/qtmaterialautocomplete_internal.cpp

@@ -1,5 +1,8 @@
 #include "qtmaterialautocomplete_internal.h"
+#include <QSignalTransition>
 #include <QPropertyAnimation>
+#include <QtWidgets/QGraphicsOpacityEffect>
+#include <QDebug>
 
 /*!
  *  \class QtMaterialAutoCompleteStateMachine
@@ -9,25 +12,57 @@
 /*!
  *  \internal
  */
-QtMaterialAutoCompleteStateMachine::QtMaterialAutoCompleteStateMachine(QtMaterialAutoComplete *parent)
-    : QStateMachine(parent),
-      m_autoComplete(parent),
+QtMaterialAutoCompleteStateMachine::QtMaterialAutoCompleteStateMachine(QWidget *menu)
+    : QStateMachine(menu),
+      m_menu(menu),
       m_closedState(new QState),
       m_openState(new QState),
       m_closingState(new QState)
 {
-    Q_ASSERT(parent);
+    Q_ASSERT(menu);
 
     addState(m_closedState);
     addState(m_openState);
     addState(m_closingState);
     setInitialState(m_closedState);
 
-    QEventTransition *transition;
+    QSignalTransition *transition;
 
-    //transition = new QEventTransition(parent, QEvent::HoverEnter);
-    //transition->setTargetState(m_focusState);
-    //m_blurState->addTransition(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(140);
+    addDefaultAnimation(animation);
+
+    transition = new QSignalTransition(animation, SIGNAL(finished()));
+    transition->setTargetState(m_closedState);
+    m_closingState->addTransition(transition);
+
+    QObject::connect(m_closedState, &QtMaterialAutoCompleteStateMachine::entered, [=](){ qDebug() << "Closed"; });
+    QObject::connect(m_openState, &QtMaterialAutoCompleteStateMachine::entered, [=](){ qDebug() << "Opened"; });
+    QObject::connect(m_closingState, &QtMaterialAutoCompleteStateMachine::entered, [=](){ qDebug() << "Closing"; });
 }
 
 /*!

components/qtmaterialautocomplete_internal.h

@@ -9,16 +9,21 @@ class QtMaterialAutoCompleteStateMachine : public QStateMachine
     Q_OBJECT
 
 public:
-    QtMaterialAutoCompleteStateMachine(QtMaterialAutoComplete *parent);
+    explicit QtMaterialAutoCompleteStateMachine(QWidget *menu);
     ~QtMaterialAutoCompleteStateMachine();
 
+signals:
+    void shouldOpen();
+    void shouldClose();
+    void shouldFade();
+
 private:
     Q_DISABLE_COPY(QtMaterialAutoCompleteStateMachine)
 
-    QtMaterialAutoComplete *const m_autoComplete;
-    QState                 *m_closedState;
-    QState                 *m_openState;
-    QState                 *m_closingState;
+    QWidget *const m_menu;
+    QState  *m_closedState;
+    QState  *m_openState;
+    QState  *m_closingState;
 };
 
 #endif // QTMATERIALAUTOCOMPLETESTATEMACHINE_H

components/qtmaterialautocomplete_p.h

@@ -19,8 +19,8 @@ public:
 
     void init();
 
-    QtMaterialAutoCompleteStateMachine *stateMachine;
     QWidget                            *menu;
+    QtMaterialAutoCompleteStateMachine *stateMachine;
     QVBoxLayout                        *menuLayout;
     QStringList                         dataSource;
     int                                 maxWidth;