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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include <qohosplatformdrag.h>
#include <QtCore/private/qohoslogger_p.h>
#include <QtCore/qobject.h>
#include <QtGui/private/qguiapplication_p.h>
#include <QtGui/qdrag.h>
#include <QtGui/qwindow.h>
#include <qohosinputmethodeventhandler.h>
#include <qohosjsmain.h>
#include <qohosplatformwindow.h>
#include <qohosutils.h>
#include <render/qohosview.h>
QT_BEGIN_NAMESPACE
namespace {
class DragEventFilterObject : public QObject
{
public:
DragEventFilterObject();
protected:
bool eventFilter(QObject *watched, QEvent *event) override;
};
class QOhosPlatformDragImpl : public QOhosPlatformDrag
{
public:
QOhosPlatformDragImpl();
~QOhosPlatformDragImpl() override;
void handlePreDrop() override;
void updateDropAction(Qt::DropAction dropAction) override;
protected:
Qt::DropAction drag(QDrag *drag) override;
private:
void startDrag();
Qt::DropAction m_dropAction = Qt::IgnoreAction;
std::shared_ptr<void> m_activeEventFilterHandle;
};
std::shared_ptr<void> installDragEventFilter()
{
auto eventFilterObject = std::make_shared<DragEventFilterObject>();
qApp->installEventFilter(eventFilterObject.get());
return QtOhos::makeDestroyNotifier(
[eventFilterObject]() {
qApp->removeEventFilter(eventFilterObject.get());
});
}
QOhosView *findInitiatorViewForDragOrNull()
{
QWindow *currentMouseWindow = QGuiApplicationPrivate::currentMouseWindow;
auto *touchedWindow = QOhosPlatformIntegration::instance()->inputMethodEventHandler()->lastTouchedWindowOrNull();
auto *qWindow = touchedWindow != nullptr ? touchedWindow : currentMouseWindow;
if (qWindow != nullptr) {
auto *platformWindow = QOhosPlatformWindow::fromQWindowOrNull(qWindow);
return platformWindow != nullptr
? platformWindow->ownedViewOrNull()
: nullptr;
} else {
return nullptr;
}
}
DragEventFilterObject::DragEventFilterObject() = default;
bool DragEventFilterObject::eventFilter(QObject *, QEvent *event)
{
switch (event->type()) {
case QEvent::ShortcutOverride:
case QEvent::KeyPress:
case QEvent::KeyRelease:
case QEvent::MouseMove:
case QEvent::MouseButtonRelease:
case QEvent::MouseButtonDblClick:
case QEvent::Wheel:
return true;
default:
return false;
}
}
QOhosPlatformDragImpl::QOhosPlatformDragImpl() = default;
QOhosPlatformDragImpl::~QOhosPlatformDragImpl() = default;
void QOhosPlatformDragImpl::handlePreDrop()
{
m_activeEventFilterHandle.reset();
}
void QOhosPlatformDragImpl::updateDropAction(Qt::DropAction dropAction)
{
m_dropAction = dropAction;
}
Qt::DropAction QOhosPlatformDragImpl::drag(QDrag *drag)
{
auto *initiatorView = findInitiatorViewForDragOrNull();
if (initiatorView == nullptr || drag == nullptr || drag->mimeData() == nullptr)
return Qt::IgnoreAction;
m_activeEventFilterHandle = installDragEventFilter();
auto eventLoop = std::make_shared<QEventLoop>();
m_dropAction = drag->defaultAction();
auto dragPixmap = !drag->pixmap().isNull() ? drag->pixmap() : QPlatformDrag::defaultPixmap();
initiatorView->startDrag(
{dragPixmap.toImage()}, drag->hotSpot(),
*drag->mimeData(),
[this, eventLoop](Qt::DropAction dropAction) {
m_dropAction = dropAction;
eventLoop->quit();
});
eventLoop->exec();
m_activeEventFilterHandle.reset();
return m_dropAction;
}
}
QOhosPlatformDrag::QOhosPlatformDrag() = default;
QOhosPlatformDrag::~QOhosPlatformDrag() = default;
std::unique_ptr<QOhosPlatformDrag> makeQOhosPlatformDrag()
{
return std::make_unique<QOhosPlatformDragImpl>();
}
QT_END_NAMESPACE