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#include <QPropertyAnimation>
#include "CollapsibleSection.hxx"
/*
* Code inspired from Stackoverflow user https://stackoverflow.com/users/887074/erotemic
* Full code under:
* https://stackoverflow.com/questions/32476006/how-to-make-an-expandable-collapsable-section-widget-in-qt/37119983#37119983
*/
CollapsibleSection::CollapsibleSection(const QString &title, const int animation_duration, QWidget *parent)
: QWidget(parent), animation_duration(animation_duration)
{
int row = 0;
toggle_button.setStyleSheet("QToolButton { border: none; }");
toggle_button.setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
toggle_button.setArrowType(Qt::ArrowType::RightArrow);
toggle_button.setText(title);
toggle_button.setCheckable(true);
toggle_button.setChecked(false);
header_line.setFrameShape(QFrame::HLine);
header_line.setFrameShadow(QFrame::Sunken);
header_line.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
content_area.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
// so all labels are displayed completely
// start out collapsed
content_area.setMaximumHeight(0);
content_area.setMinimumHeight(0);
// let the entire widget grow and shrink with its content
toggle_animation.addAnimation(new QPropertyAnimation(this, "minimumHeight"));
toggle_animation.addAnimation(new QPropertyAnimation(this, "maximumHeight"));
toggle_animation.addAnimation(new QPropertyAnimation(&content_area, "maximumHeight"));
// don't waste space
main_layout.setVerticalSpacing(0);
main_layout.setContentsMargins(0, 0, 0, 0);
main_layout.addWidget(&toggle_button, row, 0, 1, 1, Qt::AlignLeft);
main_layout.addWidget(&header_line, row++, 2, 1, 1);
main_layout.addWidget(&content_area, row, 0, 1, 3);
setLayout(&main_layout);
QObject::connect(&toggle_button, &QToolButton::clicked, [this](const bool checked) {
toggle_button.setArrowType(checked ? Qt::ArrowType::DownArrow : Qt::ArrowType::RightArrow);
toggle_animation.setDirection(checked ? QAbstractAnimation::Forward : QAbstractAnimation::Backward);
toggle_animation.start();
});
}
CollapsibleSection::~CollapsibleSection() = default;
void CollapsibleSection::setContentLayout(QLayout &content_layout, bool clicked)
{
delete content_area.layout();
content_area.setLayout(&content_layout);
const auto collapsed_height = sizeHint().height() - content_area.maximumHeight();
auto content_height = content_layout.sizeHint().height();
for (int i = 0; i < toggle_animation.animationCount() - 1; ++i)
{
auto collapsible_section_animation = static_cast<QPropertyAnimation *>(toggle_animation.animationAt(i));
collapsible_section_animation->setDuration(animation_duration);
collapsible_section_animation->setStartValue(collapsed_height);
collapsible_section_animation->setEndValue(collapsed_height + content_height);
}
auto content_animation =
static_cast<QPropertyAnimation *>(toggle_animation.animationAt(toggle_animation.animationCount() - 1));
content_animation->setDuration(animation_duration);
content_animation->setStartValue(0);
content_animation->setEndValue(content_height);
if (clicked) toggle_button.clicked(true);
}
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