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#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();
}
}
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