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#ifndef SCIQLOP_DRAGDROPHELPER_H
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#define SCIQLOP_DRAGDROPHELPER_H
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#include <Common/spimpl.h>
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#include <QLoggingCategory>
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#include <QWidget>
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class QVBoxLayout;
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class QScrollArea;
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class VisualizationDragWidget;
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class VisualizationDragDropContainer;
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class QMimeData;
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Q_DECLARE_LOGGING_CATEGORY(LOG_DragDropHelper)
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/**
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* @brief Helper class for drag&drop operations.
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* @note The helper is accessible from the sqpApp singleton and has the same life as the whole
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* application (like a controller). But contrary to a controller, it doesn't live in a thread and
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* can interect with the gui.
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* @see SqpApplication
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*/
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class DragDropHelper {
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public:
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static const QString MIME_TYPE_GRAPH;
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static const QString MIME_TYPE_ZONE;
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DragDropHelper();
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virtual ~DragDropHelper();
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/// Resets some internal variables. Must be called before any new drag&drop operation.
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void resetDragAndDrop();
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/// Sets the visualization widget currently being drag on the visualization.
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void setCurrentDragWidget(VisualizationDragWidget *dragWidget);
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/// Returns the visualization widget currently being drag on the visualization.
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/// Can be null if a new visualization widget is intended to be created by the drag&drop
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/// operation.
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VisualizationDragWidget *getCurrentDragWidget() const;
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QWidget &placeHolder() const;
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void insertPlaceHolder(QVBoxLayout *layout, int index);
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void removePlaceHolder();
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bool isPlaceHolderSet() const;
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/// Checks if the specified mime data is valid for a drop in the visualization
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bool checkMimeDataForVisualization(const QMimeData *mimeData,
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VisualizationDragDropContainer *dropContainer);
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void addDragDropScrollArea(QScrollArea *scrollArea);
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void removeDragDropScrollArea(QScrollArea *scrollArea);
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QUrl imageTemporaryUrl(const QImage &image) const;
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private:
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class DragDropHelperPrivate;
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spimpl::unique_impl_ptr<DragDropHelperPrivate> impl;
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};
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/**
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* @brief Event filter class which manage the scroll of QScrollArea during a drag&drop operation.
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* @note A QScrollArea inside an other QScrollArea is not fully supported.
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*/
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class DragDropScroller : public QObject {
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Q_OBJECT
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public:
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DragDropScroller(QObject *parent = nullptr);
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void addScrollArea(QScrollArea *scrollArea);
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void removeScrollArea(QScrollArea *scrollArea);
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protected:
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bool eventFilter(QObject *obj, QEvent *event);
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private:
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class DragDropScrollerPrivate;
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spimpl::unique_impl_ptr<DragDropScrollerPrivate> impl;
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private slots:
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void onTimer();
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};
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#endif // SCIQLOP_DRAGDROPHELPER_H
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