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/*
* SPDX-FileCopyrightText: 2013-2020 Mattia Basaglia
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*/
#ifndef COLOR_WIDGETS_GRADIENT_DELEGATE_HPP
#define COLOR_WIDGETS_GRADIENT_DELEGATE_HPP
#include <QStyledItemDelegate>
#include <QPainter>
#include "QtColorWidgets/gradient_editor.hpp"
namespace color_widgets {
/**
* \brief Item delegate to edits gradients
*
* In order to make it work, return as edit data from the model a QBrush with a gradient
*/
class QCP_EXPORT GradientDelegate : public QStyledItemDelegate
{
Q_OBJECT
public:
QWidget * createEditor(QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index) const Q_DECL_OVERRIDE
{
QVariant data = index.data(Qt::EditRole);
if ( data.canConvert<QBrush>() )
{
QBrush brush = data.value<QBrush>();
if ( brush.gradient() )
{
GradientEditor* editor = new GradientEditor(parent);
editor->setStops(brush.gradient()->stops());
return editor;
}
}
return QStyledItemDelegate::createEditor(parent, option, index);
}
void setModelData(QWidget * widget, QAbstractItemModel * model, const QModelIndex & index) const Q_DECL_OVERRIDE
{
if ( GradientEditor* editor = qobject_cast<GradientEditor*>(widget) )
model->setData(index, QBrush(editor->gradient()), Qt::EditRole);
else
QStyledItemDelegate::setModelData(widget, model, index);
}
void paint(QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index) const Q_DECL_OVERRIDE
{
QVariant display_data = index.data(Qt::DisplayRole);
QVariant gradient_data = display_data.isValid() ? display_data : index.data(Qt::EditRole);
if ( gradient_data.canConvert<QBrush>() )
{
QBrush brush = gradient_data.value<QBrush>();
if ( brush.gradient() )
{
QBrush background;
background.setTexture(QPixmap(QStringLiteral(":/color_widgets/alphaback.png")));
painter->fillRect(option.rect, background);
QLinearGradient g(option.rect.topLeft(), option.rect.topRight());
g.setStops(brush.gradient()->stops());
painter->fillRect(option.rect, g);
if ( option.state & QStyle::State_Selected )
{
int border = 2;
painter->setBrush(Qt::transparent);
painter->setPen(QPen(option.palette.highlight(), border));
painter->drawRect(option.rect.adjusted(border/2, border/2, -border/2, -border/2));
}
return;
}
}
QStyledItemDelegate::paint(painter, option, index);
}
};
} // namespace color_widgets
#endif // COLOR_WIDGETS_GRADIENT_DELEGATE_HPP
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