DragDropHelper.cpp
248 lines
| 7.4 KiB
| text/x-c
|
CppLexer
| r837 | #include "DragDropHelper.h" | |||
| #include "Visualization/VisualizationDragWidget.h" | ||||
| #include "SqpApplication.h" | ||||
| #include <QDragMoveEvent> | ||||
| #include <QDragEnterEvent> | ||||
| #include <QScrollBar> | ||||
| #include <QScrollArea> | ||||
| #include <QVBoxLayout> | ||||
| #include <QTimer> | ||||
| #include <QDir> | ||||
| const QString DragDropHelper::MIME_TYPE_GRAPH = "scqlop/graph"; | ||||
| const QString DragDropHelper::MIME_TYPE_ZONE = "scqlop/zone"; | ||||
| r840 | const int SCROLL_SPEED = 5; | |||
| const int SCROLL_ZONE_SIZE = 50; | ||||
| struct DragDropScroller::DragDropScrollerPrivate { | ||||
| QList<QScrollArea*> m_scrollAreas; | ||||
| QScrollArea* m_currentScrollArea = nullptr; | ||||
| std::unique_ptr<QTimer> m_timer = nullptr; | ||||
| enum class ScrollDirection {up, down, unknown}; | ||||
| ScrollDirection m_direction = ScrollDirection::unknown; | ||||
| explicit DragDropScrollerPrivate() | ||||
| : m_timer{std::make_unique<QTimer>()} | ||||
| { | ||||
| m_timer->setInterval(0); | ||||
| } | ||||
| }; | ||||
| DragDropScroller::DragDropScroller(QObject* parent) | ||||
| : QObject{parent}, impl{spimpl::make_unique_impl<DragDropScrollerPrivate>()} | ||||
| { | ||||
| connect(impl->m_timer.get(), &QTimer::timeout, this, &DragDropScroller::onTimer); | ||||
| } | ||||
| void DragDropScroller::addScrollArea(QScrollArea* scrollArea) | ||||
| { | ||||
| impl->m_scrollAreas << scrollArea; | ||||
| scrollArea->viewport()->setAcceptDrops(true); | ||||
| } | ||||
| void DragDropScroller::removeScrollArea(QScrollArea* scrollArea) | ||||
| { | ||||
| impl->m_scrollAreas.removeAll(scrollArea); | ||||
| scrollArea->viewport()->setAcceptDrops(false); | ||||
| } | ||||
| bool DragDropScroller::eventFilter(QObject *obj, QEvent *event) | ||||
| { | ||||
| if (event->type() == QEvent::DragMove) | ||||
| { | ||||
| auto w = static_cast<QWidget*>(obj); | ||||
| if (impl->m_currentScrollArea && impl->m_currentScrollArea->isAncestorOf(w)) | ||||
| { | ||||
| auto moveEvent = static_cast<QDragMoveEvent*>(event); | ||||
| auto pos = moveEvent->pos(); | ||||
| if (impl->m_currentScrollArea->viewport() != w) | ||||
| { | ||||
| auto globalPos = w->mapToGlobal(moveEvent->pos()); | ||||
| pos = impl->m_currentScrollArea->viewport()->mapFromGlobal(globalPos); | ||||
| } | ||||
| auto isInTopZone = pos.y() > impl->m_currentScrollArea->viewport()->size().height() - SCROLL_ZONE_SIZE; | ||||
| auto isInBottomZone = pos.y() < SCROLL_ZONE_SIZE; | ||||
| if (!isInTopZone && !isInBottomZone) | ||||
| { | ||||
| impl->m_direction = DragDropScrollerPrivate::ScrollDirection::unknown; | ||||
| impl->m_timer->stop(); | ||||
| } | ||||
| else if (!impl->m_timer->isActive()) | ||||
| { | ||||
| impl->m_direction = isInTopZone ? DragDropScrollerPrivate::ScrollDirection::up : DragDropScrollerPrivate::ScrollDirection::down; | ||||
| impl->m_timer->start(); | ||||
| } | ||||
| } | ||||
| } | ||||
| else if (event->type() == QEvent::DragEnter) | ||||
| { | ||||
| auto w = static_cast<QWidget*>(obj); | ||||
| for (auto scrollArea : impl-> m_scrollAreas) | ||||
| { | ||||
| if (impl->m_currentScrollArea != scrollArea && scrollArea->isAncestorOf(w)) | ||||
| { | ||||
| auto enterEvent = static_cast<QDragEnterEvent*>(event); | ||||
| enterEvent->acceptProposedAction(); | ||||
| enterEvent->setDropAction(Qt::IgnoreAction); | ||||
| impl->m_currentScrollArea = scrollArea; | ||||
| break; | ||||
| } | ||||
| } | ||||
| } | ||||
| else if (event->type() == QEvent::DragLeave) | ||||
| { | ||||
| auto w = static_cast<QWidget*>(obj); | ||||
| if (impl->m_currentScrollArea) | ||||
| { | ||||
| if (!QRect(QPoint(), impl->m_currentScrollArea->size()).contains(impl->m_currentScrollArea->mapFromGlobal(QCursor::pos()))) | ||||
| { | ||||
| impl->m_currentScrollArea = nullptr; | ||||
| impl->m_direction = DragDropScrollerPrivate::ScrollDirection::unknown; | ||||
| impl->m_timer->stop(); | ||||
| } | ||||
| } | ||||
| } | ||||
| else if (event->type() == QEvent::Drop) | ||||
| { | ||||
| auto w = static_cast<QWidget*>(obj); | ||||
| if (impl->m_currentScrollArea) | ||||
| { | ||||
| impl->m_currentScrollArea = nullptr; | ||||
| impl->m_direction = DragDropScrollerPrivate::ScrollDirection::unknown; | ||||
| impl->m_timer->stop(); | ||||
| } | ||||
| } | ||||
| return false; | ||||
| } | ||||
| void DragDropScroller::onTimer() | ||||
| { | ||||
| if (impl->m_currentScrollArea) | ||||
| { | ||||
| auto mvt = 0; | ||||
| switch (impl->m_direction) | ||||
| { | ||||
| case DragDropScrollerPrivate::ScrollDirection::up: | ||||
| mvt = SCROLL_SPEED; | ||||
| break; | ||||
| case DragDropScrollerPrivate::ScrollDirection::down: | ||||
| mvt = -SCROLL_SPEED; | ||||
| break; | ||||
| default: | ||||
| break; | ||||
| } | ||||
| impl->m_currentScrollArea->verticalScrollBar()->setValue(impl->m_currentScrollArea->verticalScrollBar()->value() + mvt); | ||||
| } | ||||
| } | ||||
| r837 | ||||
| struct DragDropHelper::DragDropHelperPrivate { | ||||
| VisualizationDragWidget* m_currentDragWidget = nullptr; | ||||
| std::unique_ptr<QWidget> m_placeHolder = nullptr; | ||||
| std::unique_ptr<DragDropScroller> m_dragDropScroller = nullptr; | ||||
| QString m_imageTempUrl; //Temporary file for image url generated by the drag & drop. Not using QTemporaryFile to have a name which is not generated. | ||||
| explicit DragDropHelperPrivate() | ||||
| : m_placeHolder{std::make_unique<QWidget>()}, | ||||
| m_dragDropScroller{std::make_unique<DragDropScroller>()} | ||||
| { | ||||
| m_placeHolder->setStyleSheet("background-color: #BBD5EE; border:2px solid #2A7FD4"); | ||||
| sqpApp->installEventFilter(m_dragDropScroller.get()); | ||||
| m_imageTempUrl = QDir::temp().absoluteFilePath("Scqlop_graph.png"); | ||||
| } | ||||
| void preparePlaceHolder() const | ||||
| { | ||||
| if (m_currentDragWidget) | ||||
| { | ||||
| m_placeHolder->setMinimumSize(m_currentDragWidget->size()); | ||||
| m_placeHolder->setSizePolicy(m_currentDragWidget->sizePolicy()); | ||||
| } | ||||
| else | ||||
| { | ||||
| m_placeHolder->setMinimumSize(200, 200); | ||||
| } | ||||
| } | ||||
| }; | ||||
| DragDropHelper::DragDropHelper() : | ||||
| impl{spimpl::make_unique_impl<DragDropHelperPrivate>()} | ||||
| { | ||||
| } | ||||
| DragDropHelper::~DragDropHelper() | ||||
| { | ||||
| QFile::remove(impl->m_imageTempUrl); | ||||
| } | ||||
| void DragDropHelper::setCurrentDragWidget(VisualizationDragWidget *dragWidget) | ||||
| { | ||||
| impl->m_currentDragWidget = dragWidget; | ||||
| } | ||||
| VisualizationDragWidget *DragDropHelper::getCurrentDragWidget() const | ||||
| { | ||||
| return impl->m_currentDragWidget; | ||||
| } | ||||
| QWidget& DragDropHelper::placeHolder() const | ||||
| { | ||||
| return *impl->m_placeHolder; | ||||
| } | ||||
| void DragDropHelper::insertPlaceHolder(QVBoxLayout *layout, int index) | ||||
| { | ||||
| removePlaceHolder(); | ||||
| impl->preparePlaceHolder(); | ||||
| layout->insertWidget(index, impl->m_placeHolder.get()); | ||||
| impl->m_placeHolder->show(); | ||||
| } | ||||
| void DragDropHelper::removePlaceHolder() | ||||
| { | ||||
| auto parentWidget = impl->m_placeHolder->parentWidget(); | ||||
| if (parentWidget) | ||||
| { | ||||
| parentWidget->layout()->removeWidget(impl->m_placeHolder.get()); | ||||
| impl->m_placeHolder->setParent(nullptr); | ||||
| impl->m_placeHolder->hide(); | ||||
| } | ||||
| } | ||||
| bool DragDropHelper::isPlaceHolderSet() const | ||||
| { | ||||
| return impl->m_placeHolder->parentWidget(); | ||||
| } | ||||
| r840 | void DragDropHelper::addDragDropScrollArea(QScrollArea *scrollArea) | |||
| { | ||||
| impl->m_dragDropScroller->addScrollArea(scrollArea); | ||||
| } | ||||
| void DragDropHelper::removeDragDropScrollArea(QScrollArea *scrollArea) | ||||
| { | ||||
| impl->m_dragDropScroller->removeScrollArea(scrollArea); | ||||
| } | ||||
| r837 | QUrl DragDropHelper::imageTemporaryUrl(const QImage& image) const | |||
| { | ||||
| image.save(impl->m_imageTempUrl); | ||||
| return QUrl::fromLocalFile(impl->m_imageTempUrl); | ||||
| } | ||||
