DragDropHelper.cpp
230 lines
| 7.5 KiB
| text/x-c
|
CppLexer
| r840 | #include "DragDropHelper.h" | |||
| #include "SqpApplication.h" | ||||
| r847 | #include "Visualization/VisualizationDragWidget.h" | |||
| r840 | ||||
| r847 | #include <QDir> | |||
| r840 | #include <QDragEnterEvent> | |||
| r847 | #include <QDragMoveEvent> | |||
| r840 | #include <QScrollArea> | |||
| r847 | #include <QScrollBar> | |||
| r840 | #include <QTimer> | |||
| r847 | #include <QVBoxLayout> | |||
| r840 | ||||
| const QString DragDropHelper::MIME_TYPE_GRAPH = "scqlop/graph"; | ||||
| const QString DragDropHelper::MIME_TYPE_ZONE = "scqlop/zone"; | ||||
| r843 | const int SCROLL_SPEED = 5; | |||
| const int SCROLL_ZONE_SIZE = 50; | ||||
| struct DragDropScroller::DragDropScrollerPrivate { | ||||
| r847 | QList<QScrollArea *> m_ScrollAreas; | |||
| QScrollArea *m_CurrentScrollArea = nullptr; | ||||
| std::unique_ptr<QTimer> m_Timer = nullptr; | ||||
| r843 | ||||
| r847 | enum class ScrollDirection { up, down, unknown }; | |||
| ScrollDirection m_Direction = ScrollDirection::unknown; | ||||
| r843 | ||||
| r847 | explicit DragDropScrollerPrivate() : m_Timer{std::make_unique<QTimer>()} | |||
| r843 | { | |||
| r847 | m_Timer->setInterval(0); | |||
| r843 | } | |||
| }; | ||||
| r847 | DragDropScroller::DragDropScroller(QObject *parent) | |||
| : QObject{parent}, impl{spimpl::make_unique_impl<DragDropScrollerPrivate>()} | ||||
| r843 | { | |||
| r847 | connect(impl->m_Timer.get(), &QTimer::timeout, this, &DragDropScroller::onTimer); | |||
| r843 | } | |||
| r847 | void DragDropScroller::addScrollArea(QScrollArea *scrollArea) | |||
| r843 | { | |||
| r847 | impl->m_ScrollAreas << scrollArea; | |||
| r843 | scrollArea->viewport()->setAcceptDrops(true); | |||
| } | ||||
| r847 | void DragDropScroller::removeScrollArea(QScrollArea *scrollArea) | |||
| r843 | { | |||
| r847 | impl->m_ScrollAreas.removeAll(scrollArea); | |||
| r843 | scrollArea->viewport()->setAcceptDrops(false); | |||
| } | ||||
| bool DragDropScroller::eventFilter(QObject *obj, QEvent *event) | ||||
| { | ||||
| r847 | if (event->type() == QEvent::DragMove) { | |||
| auto w = static_cast<QWidget *>(obj); | ||||
| r843 | ||||
| r847 | if (impl->m_CurrentScrollArea && impl->m_CurrentScrollArea->isAncestorOf(w)) { | |||
| auto moveEvent = static_cast<QDragMoveEvent *>(event); | ||||
| r843 | ||||
| auto pos = moveEvent->pos(); | ||||
| r847 | if (impl->m_CurrentScrollArea->viewport() != w) { | |||
| r843 | auto globalPos = w->mapToGlobal(moveEvent->pos()); | |||
| r847 | pos = impl->m_CurrentScrollArea->viewport()->mapFromGlobal(globalPos); | |||
| r843 | } | |||
| r847 | auto isInTopZone = pos.y() > impl->m_CurrentScrollArea->viewport()->size().height() | |||
| - SCROLL_ZONE_SIZE; | ||||
| r843 | auto isInBottomZone = pos.y() < SCROLL_ZONE_SIZE; | |||
| r847 | if (!isInTopZone && !isInBottomZone) { | |||
| impl->m_Direction = DragDropScrollerPrivate::ScrollDirection::unknown; | ||||
| impl->m_Timer->stop(); | ||||
| r843 | } | |||
| r847 | else if (!impl->m_Timer->isActive()) { | |||
| impl->m_Direction = isInTopZone ? DragDropScrollerPrivate::ScrollDirection::up | ||||
| : DragDropScrollerPrivate::ScrollDirection::down; | ||||
| impl->m_Timer->start(); | ||||
| r843 | } | |||
| } | ||||
| } | ||||
| r847 | else if (event->type() == QEvent::DragEnter) { | |||
| auto w = static_cast<QWidget *>(obj); | ||||
| r843 | ||||
| r847 | for (auto scrollArea : impl->m_ScrollAreas) { | |||
| if (impl->m_CurrentScrollArea != scrollArea && scrollArea->isAncestorOf(w)) { | ||||
| auto enterEvent = static_cast<QDragEnterEvent *>(event); | ||||
| r843 | enterEvent->acceptProposedAction(); | |||
| enterEvent->setDropAction(Qt::IgnoreAction); | ||||
| r847 | impl->m_CurrentScrollArea = scrollArea; | |||
| r843 | break; | |||
| } | ||||
| } | ||||
| } | ||||
| r847 | 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(); | ||||
| r843 | } | |||
| } | ||||
| } | ||||
| r847 | 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(); | ||||
| r843 | } | |||
| } | ||||
| return false; | ||||
| } | ||||
| void DragDropScroller::onTimer() | ||||
| { | ||||
| r847 | if (impl->m_CurrentScrollArea) { | |||
| r843 | auto mvt = 0; | |||
| r847 | switch (impl->m_Direction) { | |||
| case DragDropScrollerPrivate::ScrollDirection::up: | ||||
| mvt = SCROLL_SPEED; | ||||
| break; | ||||
| case DragDropScrollerPrivate::ScrollDirection::down: | ||||
| mvt = -SCROLL_SPEED; | ||||
| break; | ||||
| default: | ||||
| break; | ||||
| r843 | } | |||
| r847 | impl->m_CurrentScrollArea->verticalScrollBar()->setValue( | |||
| impl->m_CurrentScrollArea->verticalScrollBar()->value() + mvt); | ||||
| r843 | } | |||
| } | ||||
| r840 | ||||
| struct DragDropHelper::DragDropHelperPrivate { | ||||
| r847 | 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. | ||||
| r840 | ||||
| explicit DragDropHelperPrivate() | ||||
| r847 | : m_PlaceHolder{std::make_unique<QWidget>()}, | |||
| m_DragDropScroller{std::make_unique<DragDropScroller>()} | ||||
| r840 | { | |||
| r847 | m_PlaceHolder->setStyleSheet("background-color: #BBD5EE; border:2px solid #2A7FD4"); | |||
| sqpApp->installEventFilter(m_DragDropScroller.get()); | ||||
| r840 | ||||
| r847 | m_ImageTempUrl = QDir::temp().absoluteFilePath("Scqlop_graph.png"); | |||
| r840 | } | |||
| void preparePlaceHolder() const | ||||
| { | ||||
| r847 | if (m_CurrentDragWidget) { | |||
| m_PlaceHolder->setMinimumSize(m_CurrentDragWidget->size()); | ||||
| m_PlaceHolder->setSizePolicy(m_CurrentDragWidget->sizePolicy()); | ||||
| r840 | } | |||
| r847 | else { | |||
| m_PlaceHolder->setMinimumSize(200, 200); | ||||
| r840 | } | |||
| } | ||||
| }; | ||||
| r847 | DragDropHelper::DragDropHelper() : impl{spimpl::make_unique_impl<DragDropHelperPrivate>()} {} | |||
| r840 | ||||
| DragDropHelper::~DragDropHelper() | ||||
| { | ||||
| r847 | QFile::remove(impl->m_ImageTempUrl); | |||
| r840 | } | |||
| void DragDropHelper::setCurrentDragWidget(VisualizationDragWidget *dragWidget) | ||||
| { | ||||
| r847 | impl->m_CurrentDragWidget = dragWidget; | |||
| r840 | } | |||
| VisualizationDragWidget *DragDropHelper::getCurrentDragWidget() const | ||||
| { | ||||
| r847 | return impl->m_CurrentDragWidget; | |||
| r840 | } | |||
| r847 | QWidget &DragDropHelper::placeHolder() const | |||
| r840 | { | |||
| r847 | return *impl->m_PlaceHolder; | |||
| r840 | } | |||
| void DragDropHelper::insertPlaceHolder(QVBoxLayout *layout, int index) | ||||
| { | ||||
| removePlaceHolder(); | ||||
| impl->preparePlaceHolder(); | ||||
| r847 | layout->insertWidget(index, impl->m_PlaceHolder.get()); | |||
| impl->m_PlaceHolder->show(); | ||||
| r840 | } | |||
| void DragDropHelper::removePlaceHolder() | ||||
| { | ||||
| r847 | auto parentWidget = impl->m_PlaceHolder->parentWidget(); | |||
| if (parentWidget) { | ||||
| parentWidget->layout()->removeWidget(impl->m_PlaceHolder.get()); | ||||
| impl->m_PlaceHolder->setParent(nullptr); | ||||
| impl->m_PlaceHolder->hide(); | ||||
| r840 | } | |||
| } | ||||
| bool DragDropHelper::isPlaceHolderSet() const | ||||
| { | ||||
| r847 | return impl->m_PlaceHolder->parentWidget(); | |||
| r840 | } | |||
| r843 | void DragDropHelper::addDragDropScrollArea(QScrollArea *scrollArea) | |||
| { | ||||
| r847 | impl->m_DragDropScroller->addScrollArea(scrollArea); | |||
| r843 | } | |||
| void DragDropHelper::removeDragDropScrollArea(QScrollArea *scrollArea) | ||||
| { | ||||
| r847 | impl->m_DragDropScroller->removeScrollArea(scrollArea); | |||
| r843 | } | |||
| r847 | QUrl DragDropHelper::imageTemporaryUrl(const QImage &image) const | |||
| r840 | { | |||
| r847 | image.save(impl->m_ImageTempUrl); | |||
| return QUrl::fromLocalFile(impl->m_ImageTempUrl); | ||||
| r840 | } | |||
