collapse-button.h

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#include <QToolButton>
#include <QApplication>
#include <QDebug>
#include <QPropertyAnimation>
#include <QAbstractAnimation>
#include <QParallelAnimationGroup>
 
#pragma once
 
class CollapseButton : public QToolButton {
public:
  CollapseButton(QWidget *parent) : QToolButton(parent), content_(nullptr) {
    setCheckable(true);
    setStyleSheet("background:none");
    setIconSize(QSize(8, 8));
    setFont(QApplication::font());
    connect(this, &QToolButton::toggled, [=](bool checked) {
      setArrowType(checked ? Qt::ArrowType::DownArrow : Qt::ArrowType::RightArrow);
      content_ != nullptr && checked ? showContent() : hideContent();
    });
  }
 
  void setText(const QString &text) {
    QToolButton::setText(" " + text);
  }
 
  void setContent(QWidget *content) {
    qInfo() << "Set content" << content;
    assert(content != nullptr);
    content_ = content;
    auto animation_ = new QPropertyAnimation(content_, "maximumHeight"); // QObject with auto delete
    animation_->setStartValue(0);
    animation_->setEasingCurve(QEasingCurve::InOutQuad);
    animation_->setDuration(300);
    animation_->setEndValue(content->geometry().height() + 10);
    animator_.addAnimation(animation_);
    if (!isChecked()) {
      content->setMaximumHeight(0);
    }
  }
 
  void hideContent() {
    animator_.setDirection(QAbstractAnimation::Backward);
    animator_.start();
  }
 
  void showContent() {
    animator_.setDirection(QAbstractAnimation::Forward);
    animator_.start();
  }
 
private:
  QWidget *content_;
  QParallelAnimationGroup animator_;
};