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#pragma once
#include <QListView>
#include <QStyledItemDelegate>
#include <QEvent>
#include <QScrollBar>
const int pageIconSize = 24;
class PageViewDelegate : public QStyledItemDelegate
{
public:
PageViewDelegate(QObject *parent) : QStyledItemDelegate(parent)
{
}
QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
QSize size = QStyledItemDelegate::sizeHint(option, index);
size.setHeight(qMax(size.height(), 32));
return size;
}
};
class PageModel : public QAbstractListModel
{
public:
PageModel(QObject *parent = 0) : QAbstractListModel(parent)
{
QPixmap empty(pageIconSize, pageIconSize);
empty.fill(Qt::transparent);
m_emptyIcon = QIcon(empty);
}
virtual ~PageModel() {};
int rowCount(const QModelIndex &parent = QModelIndex()) const
{
return parent.isValid() ? 0 : m_pages.size();
}
QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const
{
switch (role)
{
case Qt::DisplayRole:
return m_pages.at(index.row())->displayName();
case Qt::DecorationRole:
{
QIcon icon = m_pages.at(index.row())->icon();
if (icon.isNull())
icon = m_emptyIcon;
return icon;
}
}
return QVariant();
}
void setPages(const QList<BasePage *> &pages)
{
beginResetModel();
m_pages = pages;
endResetModel();
}
const QList<BasePage *> &pages() const
{
return m_pages;
}
private:
BasePage * findPageEntryById(QString id)
{
for(auto page: m_pages)
{
if (page->id() == id)
return page;
}
return nullptr;
}
QList<BasePage *> m_pages;
QIcon m_emptyIcon;
};
class PageView : public QListView
{
public:
PageView(QWidget *parent = 0) : QListView(parent)
{
setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Expanding);
setItemDelegate(new PageViewDelegate(this));
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
}
virtual QSize sizeHint() const
{
int width = sizeHintForColumn(0) + frameWidth() * 2 + 5;
if (verticalScrollBar()->isVisible())
width += verticalScrollBar()->width();
return QSize(width, 100);
}
virtual bool eventFilter(QObject *obj, QEvent *event)
{
if (obj == verticalScrollBar() &&
(event->type() == QEvent::Show || event->type() == QEvent::Hide))
updateGeometry();
return QListView::eventFilter(obj, event);
}
};
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