cold/src/layout/PaneTabBar.cpp at master · gabrielbotandev/cold · GitHub

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#include "layout/PaneTabBar.h"

#include <QApplication>
#include <QDataStream>
#include <QDrag>
#include <QDragEnterEvent>
#include <QDragMoveEvent>
#include <QDropEvent>
#include <QMimeData>
#include <QMouseEvent>

namespace cold {

PaneTabBar::PaneTabBar(QWidget* parent) : QTabBar(parent) {
    setAcceptDrops(true);
    setMovable(true);
    setTabsClosable(true);
    setDocumentMode(true);
    setExpanding(false);
}

void PaneTabBar::setPaneId(PaneId paneId) {
    m_paneId = paneId;
}

PaneId PaneTabBar::paneId() const {
    return m_paneId;
}

void PaneTabBar::mousePressEvent(QMouseEvent* event) {
    if (event->button() == Qt::LeftButton) {
        m_dragStartPosition = event->pos();
        m_dragStartIndex = tabAt(event->pos());
    }
    QTabBar::mousePressEvent(event);
}

void PaneTabBar::mouseMoveEvent(QMouseEvent* event) {
    if (!(event->buttons() & Qt::LeftButton) || m_dragStartIndex < 0) {
        QTabBar::mouseMoveEvent(event);
        return;
    }

    if ((event->pos() - m_dragStartPosition).manhattanLength() <
        QApplication::startDragDistance()) {
        QTabBar::mouseMoveEvent(event);
        return;
    }

    QByteArray payload;
    QDataStream out(&payload, QIODevice::WriteOnly);
    out << m_paneId << m_dragStartIndex;

    auto* mime = new QMimeData();
    mime->setData(QString::fromLatin1(kPaneItemMimeType), payload);

    auto* drag = new QDrag(this);
    drag->setMimeData(mime);
    drag->exec(Qt::MoveAction);
    m_dragStartIndex = -1;
}

void PaneTabBar::dragEnterEvent(QDragEnterEvent* event) {
    if (event->mimeData()->hasFormat(QString::fromLatin1(kPaneItemMimeType))) {
        event->acceptProposedAction();
        return;
    }
    QTabBar::dragEnterEvent(event);
}

void PaneTabBar::dragMoveEvent(QDragMoveEvent* event) {
    if (event->mimeData()->hasFormat(QString::fromLatin1(kPaneItemMimeType))) {
        event->acceptProposedAction();
        return;
    }
    QTabBar::dragMoveEvent(event);
}

void PaneTabBar::dropEvent(QDropEvent* event) {
    if (!event->mimeData()->hasFormat(QString::fromLatin1(kPaneItemMimeType))) {
        QTabBar::dropEvent(event);
        return;
    }

    QByteArray payload = event->mimeData()->data(QString::fromLatin1(kPaneItemMimeType));
    QDataStream in(&payload, QIODevice::ReadOnly);
    PaneId sourcePane = -1;
    int sourceIndex = -1;
    in >> sourcePane >> sourceIndex;

#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
    const QPoint pos = event->position().toPoint();
#else
    const QPoint pos = event->pos();
#endif
    emit tabMoveRequested(sourcePane, sourceIndex, m_paneId, insertionIndexAt(pos));
    event->acceptProposedAction();
}

int PaneTabBar::insertionIndexAt(const QPoint& pos) const {
    if (count() == 0) {
        return 0;
    }

    const int hit = tabAt(pos);
    if (hit < 0) {
        return pos.x() < tabRect(0).center().x() ? 0 : count();
    }

    return pos.x() < tabRect(hit).center().x() ? hit : hit + 1;
}

} // namespace cold