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#include "Visualization/VisualizationDragDropContainer.h"
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#include "DragDropHelper.h"
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#include "SqpApplication.h"
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#include "Visualization/VisualizationDragWidget.h"
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#include "Common/VisualizationDef.h"
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#include <QDrag>
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#include <QDragEnterEvent>
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#include <QVBoxLayout>
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#include <cmath>
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#include <memory>
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Q_LOGGING_CATEGORY(LOG_VisualizationDragDropContainer, "VisualizationDragDropContainer")
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struct VisualizationDragDropContainer::VisualizationDragDropContainerPrivate {
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QVBoxLayout *m_Layout;
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QHash<QString, VisualizationDragDropContainer::DropBehavior> m_AcceptedMimeTypes;
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VisualizationDragDropContainer::AcceptMimeDataFunction m_AcceptMimeDataFun
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= [](auto mimeData) { return true; };
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int m_MinContainerHeight = 0;
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explicit VisualizationDragDropContainerPrivate(QWidget *widget)
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{
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m_Layout = new QVBoxLayout(widget);
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m_Layout->setContentsMargins(0, 0, 0, 0);
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}
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bool acceptMimeData(const QMimeData *data) const
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{
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for (const auto &type : m_AcceptedMimeTypes.keys()) {
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if (data->hasFormat(type) && m_AcceptMimeDataFun(data)) {
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return true;
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}
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}
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return false;
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}
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bool allowMergeForMimeData(const QMimeData *data) const
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{
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bool result = false;
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for (auto it = m_AcceptedMimeTypes.constBegin(); it != m_AcceptedMimeTypes.constEnd();
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++it) {
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if (data->hasFormat(it.key())
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&& (it.value() == VisualizationDragDropContainer::DropBehavior::Merged
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|| it.value()
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== VisualizationDragDropContainer::DropBehavior::InsertedAndMerged)) {
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result = true;
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}
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else if (data->hasFormat(it.key())
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&& it.value() == VisualizationDragDropContainer::DropBehavior::Inserted) {
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// Merge is forbidden if the mime data contain an acceptable type which cannot be
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// merged
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result = false;
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break;
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}
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}
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return result;
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}
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bool allowInsertForMimeData(const QMimeData *data) const
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{
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for (auto it = m_AcceptedMimeTypes.constBegin(); it != m_AcceptedMimeTypes.constEnd();
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++it) {
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if (data->hasFormat(it.key())
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&& (it.value() == VisualizationDragDropContainer::DropBehavior::Inserted
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|| it.value()
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== VisualizationDragDropContainer::DropBehavior::InsertedAndMerged)) {
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return true;
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}
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}
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return false;
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}
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bool hasPlaceHolder() const
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{
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return sqpApp->dragDropHelper().placeHolder().parentWidget() == m_Layout->parentWidget();
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}
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VisualizationDragWidget *getChildDragWidgetAt(const QWidget *parent, const QPoint &pos) const
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{
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VisualizationDragWidget *dragWidget = nullptr;
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for (auto child : parent->children()) {
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auto widget = qobject_cast<VisualizationDragWidget *>(child);
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if (widget && widget->isVisible()) {
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if (widget->frameGeometry().contains(pos)) {
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dragWidget = widget;
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break;
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}
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}
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}
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return dragWidget;
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}
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bool cursorIsInContainer(QWidget *container) const
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{
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return container->isAncestorOf(sqpApp->widgetAt(QCursor::pos()));
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}
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int countDragWidget(const QWidget *parent, bool onlyVisible = false) const
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{
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auto nbGraph = 0;
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for (auto child : parent->children()) {
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if (qobject_cast<VisualizationDragWidget *>(child)) {
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if (!onlyVisible || qobject_cast<VisualizationDragWidget *>(child)->isVisible()) {
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nbGraph += 1;
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}
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}
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}
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return nbGraph;
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}
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void findPlaceHolderPosition(const QPoint &pos, bool canInsert, bool canMerge,
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const VisualizationDragDropContainer *container);
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};
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VisualizationDragDropContainer::VisualizationDragDropContainer(QWidget *parent)
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: QFrame{parent},
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impl{spimpl::make_unique_impl<VisualizationDragDropContainerPrivate>(this)}
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{
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setAcceptDrops(true);
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}
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void VisualizationDragDropContainer::addDragWidget(VisualizationDragWidget *dragWidget)
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{
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impl->m_Layout->addWidget(dragWidget);
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disconnect(dragWidget, &VisualizationDragWidget::dragDetected, nullptr, nullptr);
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connect(dragWidget, &VisualizationDragWidget::dragDetected, this,
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&VisualizationDragDropContainer::startDrag);
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}
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void VisualizationDragDropContainer::insertDragWidget(int index,
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VisualizationDragWidget *dragWidget)
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{
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impl->m_Layout->insertWidget(index, dragWidget);
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disconnect(dragWidget, &VisualizationDragWidget::dragDetected, nullptr, nullptr);
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connect(dragWidget, &VisualizationDragWidget::dragDetected, this,
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&VisualizationDragDropContainer::startDrag);
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}
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void VisualizationDragDropContainer::addAcceptedMimeType(
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const QString &mimeType, VisualizationDragDropContainer::DropBehavior behavior)
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{
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impl->m_AcceptedMimeTypes[mimeType] = behavior;
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}
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int VisualizationDragDropContainer::countDragWidget() const
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{
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return impl->countDragWidget(this);
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}
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void VisualizationDragDropContainer::setAcceptMimeDataFunction(
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VisualizationDragDropContainer::AcceptMimeDataFunction fun)
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{
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impl->m_AcceptMimeDataFun = fun;
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}
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void VisualizationDragDropContainer::startDrag(VisualizationDragWidget *dragWidget,
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const QPoint &dragPosition)
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{
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auto &helper = sqpApp->dragDropHelper();
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helper.resetDragAndDrop();
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// Note: The management of the drag object is done by Qt
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auto drag = new QDrag{dragWidget};
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drag->setHotSpot(dragPosition);
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auto mimeData = dragWidget->mimeData();
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drag->setMimeData(mimeData);
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auto pixmap = QPixmap(dragWidget->size());
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dragWidget->render(&pixmap);
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drag->setPixmap(pixmap);
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auto image = pixmap.toImage();
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mimeData->setImageData(image);
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mimeData->setUrls({helper.imageTemporaryUrl(image)});
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if (impl->m_Layout->indexOf(dragWidget) >= 0) {
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helper.setCurrentDragWidget(dragWidget);
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if (impl->cursorIsInContainer(this)) {
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auto dragWidgetIndex = impl->m_Layout->indexOf(dragWidget);
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helper.insertPlaceHolder(impl->m_Layout, dragWidgetIndex);
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dragWidget->setVisible(false);
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}
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else {
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// The drag starts directly outside the drop zone
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// do not add the placeHolder
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}
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// Note: The exec() is blocking on windows but not on linux and macOS
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drag->exec(Qt::MoveAction | Qt::CopyAction);
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}
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else {
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qCWarning(LOG_VisualizationDragDropContainer())
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<< tr("VisualizationDragDropContainer::startDrag, drag aborted, the specified "
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"VisualizationDragWidget is not found in this container.");
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}
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}
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void VisualizationDragDropContainer::dragEnterEvent(QDragEnterEvent *event)
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{
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if (impl->acceptMimeData(event->mimeData())) {
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event->acceptProposedAction();
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auto &helper = sqpApp->dragDropHelper();
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if (!impl->hasPlaceHolder()) {
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auto dragWidget = helper.getCurrentDragWidget();
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if (dragWidget) {
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// If the drag&drop is internal to the visualization, entering the container hide
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// the dragWidget which was made visible by the dragLeaveEvent
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auto parentWidget
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= qobject_cast<VisualizationDragDropContainer *>(dragWidget->parentWidget());
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if (parentWidget) {
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dragWidget->setVisible(false);
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}
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}
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auto canMerge = impl->allowMergeForMimeData(event->mimeData());
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auto canInsert = impl->allowInsertForMimeData(event->mimeData());
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impl->findPlaceHolderPosition(event->pos(), canInsert, canMerge, this);
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}
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else {
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// do nothing
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}
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}
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else {
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event->ignore();
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}
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QWidget::dragEnterEvent(event);
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}
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void VisualizationDragDropContainer::dragLeaveEvent(QDragLeaveEvent *event)
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{
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Q_UNUSED(event);
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auto &helper = sqpApp->dragDropHelper();
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if (!impl->cursorIsInContainer(this)) {
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helper.removePlaceHolder();
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helper.setHightlightedDragWidget(nullptr);
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impl->m_MinContainerHeight = 0;
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auto dragWidget = helper.getCurrentDragWidget();
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if (dragWidget) {
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// dragWidget has a value only if the drag is started from the visualization
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// In that case, shows the drag widget at its original place
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// So the drag widget doesn't stay hidden if the drop occurs outside the visualization
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// drop zone (It is not possible to catch a drop event outside of the application)
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if (dragWidget) {
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dragWidget->setVisible(true);
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}
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}
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}
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else {
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// Leave event probably received for a child widget.
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// Do nothing.
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// Note: The DragLeave event, doesn't have any mean to determine who sent it.
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}
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QWidget::dragLeaveEvent(event);
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}
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void VisualizationDragDropContainer::dragMoveEvent(QDragMoveEvent *event)
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{
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if (impl->acceptMimeData(event->mimeData())) {
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auto canMerge = impl->allowMergeForMimeData(event->mimeData());
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auto canInsert = impl->allowInsertForMimeData(event->mimeData());
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impl->findPlaceHolderPosition(event->pos(), canInsert, canMerge, this);
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}
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else {
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event->ignore();
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}
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QWidget::dragMoveEvent(event);
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}
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void VisualizationDragDropContainer::dropEvent(QDropEvent *event)
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{
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auto &helper = sqpApp->dragDropHelper();
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if (impl->acceptMimeData(event->mimeData())) {
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auto dragWidget = helper.getCurrentDragWidget();
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if (impl->hasPlaceHolder()) {
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// drop where the placeHolder is located
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auto canInsert = impl->allowInsertForMimeData(event->mimeData());
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if (canInsert) {
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auto droppedIndex = impl->m_Layout->indexOf(&helper.placeHolder());
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if (dragWidget) {
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auto dragWidgetIndex = impl->m_Layout->indexOf(dragWidget);
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if (dragWidgetIndex >= 0 && dragWidgetIndex < droppedIndex) {
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// Correction of the index if the drop occurs in the same container
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// and if the drag is started from the visualization (in that case, the
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// dragWidget is hidden)
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droppedIndex -= 1;
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}
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dragWidget->setVisible(true);
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}
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event->acceptProposedAction();
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helper.removePlaceHolder();
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emit dropOccuredInContainer(droppedIndex, event->mimeData());
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}
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else {
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qCWarning(LOG_VisualizationDragDropContainer()) << tr(
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"VisualizationDragDropContainer::dropEvent, dropping on the placeHolder, but "
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"the insertion is forbidden.");
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Q_ASSERT(false);
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}
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}
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else if (helper.getHightlightedDragWidget()) {
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// drop on the highlighted widget
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auto canMerge = impl->allowMergeForMimeData(event->mimeData());
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if (canMerge) {
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event->acceptProposedAction();
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emit dropOccuredOnWidget(helper.getHightlightedDragWidget(), event->mimeData());
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}
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else {
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qCWarning(LOG_VisualizationDragDropContainer())
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<< tr("VisualizationDragDropContainer::dropEvent, dropping on a widget, but "
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"the merge is forbidden.");
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Q_ASSERT(false);
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}
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}
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}
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else {
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event->ignore();
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}
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sqpApp->dragDropHelper().setHightlightedDragWidget(nullptr);
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impl->m_MinContainerHeight = 0;
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QWidget::dropEvent(event);
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}
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void VisualizationDragDropContainer::VisualizationDragDropContainerPrivate::findPlaceHolderPosition(
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const QPoint &pos, bool canInsert, bool canMerge,
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const VisualizationDragDropContainer *container)
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{
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auto &helper = sqpApp->dragDropHelper();
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auto absPos = container->mapToGlobal(pos);
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auto isOnPlaceHolder = sqpApp->widgetAt(absPos) == &(helper.placeHolder());
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if (countDragWidget(container, true) == 0) {
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// Drop on an empty container, just add the placeHolder at the top
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helper.insertPlaceHolder(m_Layout, 0);
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}
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else if (!isOnPlaceHolder) {
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auto nbDragWidget = countDragWidget(container);
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if (nbDragWidget > 0) {
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if (m_MinContainerHeight == 0) {
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m_MinContainerHeight = container->size().height();
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}
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m_MinContainerHeight = qMin(m_MinContainerHeight, container->size().height());
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auto graphHeight = qMax(m_MinContainerHeight / nbDragWidget, GRAPH_MINIMUM_HEIGHT);
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auto posY = pos.y();
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auto dropIndex = floor(posY / graphHeight);
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auto zoneSize = qMin(graphHeight / 4.0, 75.0);
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auto isOnTop = posY < dropIndex * graphHeight + zoneSize;
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auto isOnBottom = posY > (dropIndex + 1) * graphHeight - zoneSize;
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auto placeHolderIndex = m_Layout->indexOf(&(helper.placeHolder()));
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auto dragWidgetHovered = getChildDragWidgetAt(container, pos);
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if (canInsert && (isOnTop || isOnBottom || !canMerge)) {
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if (isOnBottom) {
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dropIndex += 1;
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}
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if (helper.getCurrentDragWidget()) {
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auto dragWidgetIndex = m_Layout->indexOf(helper.getCurrentDragWidget());
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if (dragWidgetIndex >= 0 && dragWidgetIndex <= dropIndex) {
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// Correction of the index if the drop occurs in the same container
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// and if the drag is started from the visualization (in that case, the
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// dragWidget is hidden)
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dropIndex += 1;
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}
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}
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if (dropIndex != placeHolderIndex) {
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helper.insertPlaceHolder(m_Layout, dropIndex);
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}
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helper.setHightlightedDragWidget(nullptr);
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}
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else if (canMerge && dragWidgetHovered) {
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// drop on the middle -> merge
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if (hasPlaceHolder()) {
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helper.removePlaceHolder();
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}
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helper.setHightlightedDragWidget(dragWidgetHovered);
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}
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else {
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qCWarning(LOG_VisualizationDragDropContainer()) << tr(
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"VisualizationDragDropContainer::findPlaceHolderPosition, no valid drop "
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"action.");
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Q_ASSERT(false);
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}
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}
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else {
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qCWarning(LOG_VisualizationDragDropContainer())
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<< tr("VisualizationDragDropContainer::findPlaceHolderPosition, no widget "
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"found in the "
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"container");
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}
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}
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else {
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// the mouse is hover the placeHolder
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// Do nothing
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}
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}
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