1 files changed, 125 insertions, 0 deletions
diff --git a/application/groupview/GroupView.h b/application/groupview/GroupView.h
new file mode 100644
index 00000000..93e45ed7
--- /dev/null
+++ b/application/groupview/GroupView.h
@@ -0,0 +1,125 @@
+#pragma once
+
+#include <QListView>
+#include <QLineEdit>
+#include <QScrollBar>
+#include <QCache>
+
+struct GroupViewRoles
+{
+	enum
+	{
+		GroupRole = Qt::UserRole,
+		ProgressValueRole,
+		ProgressMaximumRole
+	};
+};
+
+struct VisualGroup;
+
+class GroupView : public QAbstractItemView
+{
+	Q_OBJECT
+
+public:
+	GroupView(QWidget *parent = 0);
+	~GroupView();
+
+	void setModel(QAbstractItemModel *model) override;
+
+	/// return geometry rectangle occupied by the specified model item
+	QRect geometryRect(const QModelIndex &index) const;
+	/// return visual rectangle occupied by the specified model item
+	virtual QRect visualRect(const QModelIndex &index) const override;
+	/// get the model index at the specified visual point
+	virtual QModelIndex indexAt(const QPoint &point) const override;
+	void setSelection(const QRect &rect,
+					  const QItemSelectionModel::SelectionFlags commands) override;
+
+	virtual int horizontalOffset() const override;
+	virtual int verticalOffset() const override;
+	virtual void scrollContentsBy(int dx, int dy) override;
+	virtual void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible) override;
+
+	virtual QModelIndex moveCursor(CursorAction cursorAction,
+								   Qt::KeyboardModifiers modifiers) override;
+
+	virtual QRegion visualRegionForSelection(const QItemSelection &selection) const override;
+
+	int spacing() const
+	{
+		return m_spacing;
+	};
+protected
+slots:
+	virtual void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight,
+							 const QVector<int> &roles) override;
+	virtual void rowsInserted(const QModelIndex &parent, int start, int end) override;
+	virtual void rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end) override;
+	virtual void updateGeometries() override;
+	void modelReset();
+
+protected:
+	virtual bool isIndexHidden(const QModelIndex &index) const override;
+	void mousePressEvent(QMouseEvent *event) override;
+	void mouseMoveEvent(QMouseEvent *event) override;
+	void mouseReleaseEvent(QMouseEvent *event) override;
+	void mouseDoubleClickEvent(QMouseEvent *event) override;
+	void paintEvent(QPaintEvent *event) override;
+	void resizeEvent(QResizeEvent *event) override;
+
+	void dragEnterEvent(QDragEnterEvent *event) override;
+	void dragMoveEvent(QDragMoveEvent *event) override;
+	void dragLeaveEvent(QDragLeaveEvent *event) override;
+	void dropEvent(QDropEvent *event) override;
+
+	void startDrag(Qt::DropActions supportedActions) override;
+
+private:
+	friend struct VisualGroup;
+	QList<VisualGroup *> m_groups;
+
+	// geometry
+	int m_leftMargin = 5;
+	int m_rightMargin = 5;
+	int m_bottomMargin = 5;
+	int m_categoryMargin = 5;
+	int m_spacing = 5;
+	int m_itemWidth = 100;
+	int m_currentItemsPerRow = -1;
+	int m_currentCursorColumn= -1;
+	mutable QCache<int, QRect> geometryCache;
+
+	// point where the currently active mouse action started in geometry coordinates
+	QPoint m_pressedPosition;
+	QPersistentModelIndex m_pressedIndex;
+	bool m_pressedAlreadySelected;
+	VisualGroup *m_pressedCategory;
+	QItemSelectionModel::SelectionFlag m_ctrlDragSelectionFlag;
+	QPoint m_lastDragPosition;
+
+	VisualGroup *category(const QModelIndex &index) const;
+	VisualGroup *category(const QString &cat) const;
+	VisualGroup *categoryAt(const QPoint &pos) const;
+
+	int itemsPerRow() const
+	{
+		return m_currentItemsPerRow;
+	};
+	int contentWidth() const;
+
+private: /* methods */
+	int itemWidth() const;
+	int calculateItemsPerRow() const;
+	int verticalScrollToValue(const QModelIndex &index, const QRect &rect,
+							  QListView::ScrollHint hint) const;
+	QPixmap renderToPixmap(const QModelIndexList &indices, QRect *r) const;
+	QList<QPair<QRect, QModelIndex>> draggablePaintPairs(const QModelIndexList &indices,
+														 QRect *r) const;
+
+	bool isDragEventAccepted(QDropEvent *event);
+
+	QPair<VisualGroup *, int> rowDropPos(const QPoint &pos);
+
+	QPoint offset() const;
+};