From 2adcd4f24eca2fa529c42fc1165319bcc4ea179e Mon Sep 17 00:00:00 2001
From: Victor Tran <vicr12345@gmail.com>
Date: Thu, 12 Jul 2018 18:12:14 +1000
Subject: Initial commit

---
 installer/fadestackedwidget.cpp | 57 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 installer/fadestackedwidget.cpp

(limited to 'installer/fadestackedwidget.cpp')

diff --git a/installer/fadestackedwidget.cpp b/installer/fadestackedwidget.cpp
new file mode 100644
index 0000000..e925c99
--- /dev/null
+++ b/installer/fadestackedwidget.cpp
@@ -0,0 +1,57 @@
+#include "fadestackedwidget.h"
+
+FadeStackedWidget::FadeStackedWidget(QWidget *parent) : QStackedWidget(parent)
+{
+
+}
+
+void FadeStackedWidget::setCurrentIndex(int index) {
+    //Do some checks before setting the current index.
+    if (currentIndex() != index) {
+        doSetCurrentIndex(index);
+    }
+}
+
+void FadeStackedWidget::doSetCurrentIndex(int index) {
+    QWidget* currentWidget = widget(currentIndex());
+    QWidget* nextWidget = widget(index);
+    if (nextWidget == nullptr) {
+        QStackedWidget::setCurrentIndex(index);
+    } else {
+        if (doingNewAnimation) {
+            anim->stop();
+            anim->deleteLater();
+        }
+
+        doingNewAnimation = true;
+        QGraphicsOpacityEffect* currentOpacity = new QGraphicsOpacityEffect();
+        QGraphicsOpacityEffect* nextOpacity = new QGraphicsOpacityEffect();
+        currentWidget->setGraphicsEffect(currentOpacity);
+        nextWidget->setGraphicsEffect(nextOpacity);
+
+        anim = new QVariantAnimation();
+        anim->setStartValue((float) 1);
+        anim->setEndValue((float) 0);
+        anim->setDuration(500);
+        anim->setEasingCurve(QEasingCurve::InCubic);
+        connect(anim, &QVariantAnimation::finished, [=] {
+            if (anim->direction() == QVariantAnimation::Forward) {
+                anim->setDirection(QVariantAnimation::Backward);
+                QStackedWidget::setCurrentIndex(index);
+                anim->start();
+            } else {
+                doingNewAnimation = false;
+                anim->deleteLater();
+                anim = nullptr;
+            }
+        });
+        connect(anim, &QVariantAnimation::valueChanged, [=](QVariant value) {
+            if (anim->direction() == QVariantAnimation::Forward) {
+                currentOpacity->setOpacity(value.toFloat());
+            } else {
+                nextOpacity->setOpacity(value.toFloat());
+            }
+        });
+        anim->start();
+    }
+}
-- 
cgit v1.2.3