mirror-chatterino2/src/widgets/resizingtextedit.hpp

#pragma once

#include <QKeyEvent>
#include <QTextEdit>
#include <boost/signals2.hpp>

class ResizingTextEdit : public QTextEdit
{
public:
    ResizingTextEdit()
        : keyPressed()
    {
        auto sizePolicy = this->sizePolicy();
        sizePolicy.setHeightForWidth(true);
        sizePolicy.setVerticalPolicy(QSizePolicy::Preferred);
        this->setSizePolicy(sizePolicy);

        QObject::connect(this, &QTextEdit::textChanged, this, &QWidget::updateGeometry);
    }

    QSize sizeHint() const override
    {
        return QSize(this->width(), this->heightForWidth(this->width()));
    }

    bool hasHeightForWidth() const override
    {
        return true;
    }

    boost::signals2::signal<void(QKeyEvent *)> keyPressed;

protected:
    int heightForWidth(int) const override
    {
        auto margins = this->contentsMargins();

        return margins.top() + document()->size().height() + margins.bottom() + 5;
    }

    void keyPressEvent(QKeyEvent *event) override
    {
        event->ignore();

        keyPressed(event);

        if (!event->isAccepted()) {
            QTextEdit::keyPressEvent(event);
        }
    }
};