pinned_overlay_view.h

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#ifndef PINNED_OVERLAY_VIEW_H
#define PINNED_OVERLAY_VIEW_H
 
#include <QTreeView>
#include <QHeaderView>
#include <QHelpEvent>
#include <QStyledItemDelegate>
#include <QWidget>
#include <QPalette>
 
#include <functional>

namespace PinnedOverlayView {

class FixedRowHeightDelegate : public QStyledItemDelegate
{
public:
    FixedRowHeightDelegate(QAbstractItemDelegate *inner, std::function<int()> row_height, QObject *parent) :
        QStyledItemDelegate(parent), inner_(inner), row_height_(std::move(row_height)) {}
 
    void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override
    {
        if (inner_) {
            inner_->paint(painter, option, index);
        } else {
            QStyledItemDelegate::paint(painter, option, index);
        }
    }
 
    QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const override
    {
        QSize size = inner_ ? inner_->sizeHint(option, index) : QStyledItemDelegate::sizeHint(option, index);
        int height = row_height_ ? row_height_() : 0;
        if (height > 0) {
            size.setHeight(height);
        }
        return size;
    }
 
    bool helpEvent(QHelpEvent *event, QAbstractItemView *view, const QStyleOptionViewItem &option, const QModelIndex &index) override
    {
        return inner_ ? inner_->helpEvent(event, view, option, index)
                      : QStyledItemDelegate::helpEvent(event, view, option, index);
    }
 
private:
    QAbstractItemDelegate *inner_;
    std::function<int()> row_height_;
};

inline void applyCommonTreeViewSetup(QTreeView *view)
{
    view->setItemsExpandable(false);
    view->setRootIsDecorated(false);
    view->setUniformRowHeights(true);
    view->setFocusPolicy(Qt::NoFocus);
    view->setMouseTracking(true);
    view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    view->setFrameShape(QFrame::NoFrame);
    view->setVisible(false);
}

inline QWidget *createBoundaryDivider(QTreeView *view)
{
    QWidget *divider = new QWidget(view);
    divider->setAutoFillBackground(true);
    QPalette divider_palette = divider->palette();
    divider_palette.setColor(QPalette::Window, view->palette().color(QPalette::Mid));
    divider->setPalette(divider_palette);
    return divider;
}

inline void repositionBoundaryDivider(QWidget *divider, QTreeView *view)
{
    const int divider_width = 2;
    divider->setGeometry(view->width() - divider_width, 0, divider_width, view->height());
    divider->raise();
}

inline void mirrorSectionWidth(QTreeView *view, int column, int width)
{
    if (column < 0 || !view->header() || column >= view->header()->count()) {
        return;
    }
    view->header()->resizeSection(column, width);
}
 
} // namespace PinnedOverlayView
 
#endif // PINNED_OVERLAY_VIEW_H