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#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;
};
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