79 lines
2.2 KiB
C++
Executable File
79 lines
2.2 KiB
C++
Executable File
#include "icon_view_delegate.h"
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#include <QGraphicsDropShadowEffect>
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#include <QGraphicsScene>
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#include <QGraphicsPixmapItem>
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#include <QPainter>
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#include <QDebug>
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namespace LtsDataView
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{
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static constexpr int s_shadowRadius = 22;
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void IconViewDelegate::setDisplayWidgetCreator(const std::function<AbstractDisplayWidget*()> &customDisplayWidgetCreator)
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{
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m_customDisplayWidgetCreator = customDisplayWidgetCreator;
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QScopedPointer<AbstractDisplayWidget> dw(m_customDisplayWidgetCreator());
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if (!dw)
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{
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qWarning() << "IconViewDelegate::setDisplayWidgetCreator: delegate is not a base of AbstractDisplayWidget!";
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Q_ASSERT(false);
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return;
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}
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m_displayWidgetSize = dw->size() + QSize(s_shadowRadius * 2, s_shadowRadius * 2);
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}
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QSize IconViewDelegate::sizeHint(const QStyleOptionViewItem &, const QModelIndex &) const
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{
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return m_displayWidgetSize;
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}
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void IconViewDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
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{
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QScopedPointer<AbstractDisplayWidget> dw(m_customDisplayWidgetCreator());
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if (!dw)
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{
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qWarning() << "IconViewDelegate::paint: delegate is not a base of AbstractDisplayWidget!";
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Q_ASSERT(false);
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return;
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}
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if (!dw->init(index))
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{
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qWarning() << "IconViewDelegate::paint: delegate could not create ui";
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return;
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}
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const auto dpr = dw->devicePixelRatioF();
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QPixmap p(dw->size() * dpr);
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p.setDevicePixelRatio(dpr);
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QPainter myPainter(&p);
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dw->render(&myPainter);
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myPainter.end();
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// drop shadow
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QGraphicsDropShadowEffect *shadowEffect = new QGraphicsDropShadowEffect();
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shadowEffect->setBlurRadius(s_shadowRadius);
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shadowEffect->setOffset(0, 0); // center (shadow on all sides)
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if (option.state & QStyle::State_Selected)
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shadowEffect->setColor(dw->palette().light().color());
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else
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shadowEffect->setColor(dw->palette().shadow().color());
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// draw pixmap & shadow
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QGraphicsPixmapItem *item = new QGraphicsPixmapItem(p);
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item->setGraphicsEffect(shadowEffect);
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// TODO: avoid creating a QGraphicsScene by using QGraphicsItem::paint()
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QGraphicsScene scene;
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scene.addItem(item);
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scene.render(painter, option.rect, QRectF(-s_shadowRadius, -s_shadowRadius, option.rect.width(), option.rect.height()));
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}
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} // namespace LtsDataView
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