FitParameterDelegate.cpp

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      GUI/View/Fit/FitParameterDelegate.cpp
//! @brief     Implements class FitParameterDelegate
//!
//! @homepage  http://www.bornagainproject.org
//! @license   GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2021
//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
//  ************************************************************************************************
 
#include "GUI/View/Fit/FitParameterDelegate.h"
#include "GUI/Model/BaseItem/SessionItem.h"
#include "GUI/View/Common/CustomEventFilters.h"
#include "GUI/View/PropertyEditor/CustomEditors.h"
#include "GUI/View/PropertyEditor/PropertyEditorFactory.h"
#include <QApplication>
 
FitParameterDelegate::FitParameterDelegate(QObject* parent)
    : QStyledItemDelegate(parent)
{
}
 
void FitParameterDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option,
                                 const QModelIndex& index) const
{
    if (GUI::View::PropertyEditorFactory::hasStringRepresentation(index)) {
        QString text = GUI::View::PropertyEditorFactory::toString(index);
        paintCustomLabel(painter, option, index, text);
    } else
        QStyledItemDelegate::paint(painter, option, index);
}
 
QWidget* FitParameterDelegate::createEditor(QWidget* parent, const QStyleOptionViewItem& option,
                                            const QModelIndex& index) const
{
    auto* result = createEditorFromIndex(index, parent);
 
    if (auto* customEditor = dynamic_cast<CustomEditor*>(result)) {
        new TabFromFocusProxy(customEditor);
        connect(customEditor, &CustomEditor::dataChanged, this,
                &FitParameterDelegate::onCustomEditorDataChanged);
    }
 
    if (!result) // falling back to default behaviour
        result = QStyledItemDelegate::createEditor(parent, option, index);
 
    return result;
}
 
//! Propagates changed data from the editor to the model.
 
void FitParameterDelegate::setModelData(QWidget* editor, QAbstractItemModel* model,
                                        const QModelIndex& index) const
{
    if (!index.isValid())
        return;
 
    if (auto* customEditor = dynamic_cast<CustomEditor*>(editor))
        model->setData(index, customEditor->editorData());
    else
        QStyledItemDelegate::setModelData(editor, model, index);
}
 
//! Propagates the data change from the model to the editor (if it is still opened).
 
void FitParameterDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const
{
    if (!index.isValid())
        return;
 
    if (auto* customEditor = dynamic_cast<CustomEditor*>(editor))
        customEditor->setData(index.data());
    else
        QStyledItemDelegate::setEditorData(editor, index);
}
 
//! Increases height of the row by 20% wrt the default.
 
QSize FitParameterDelegate::sizeHint(const QStyleOptionViewItem& option,
                                     const QModelIndex& index) const
{
    QSize result = QStyledItemDelegate::sizeHint(option, index);
    result.setHeight(static_cast<int>(result.height() * 1.2));
    return result;
}
 
//! Makes an editor occupying whole available space in a cell. If cell contains an icon
//! as a decoration (i.e. icon of material property), it will be hidden as soon as editor
//! up and running.
 
void FitParameterDelegate::updateEditorGeometry(QWidget* editor, const QStyleOptionViewItem& option,
                                                const QModelIndex& index) const
{
    QStyledItemDelegate::updateEditorGeometry(editor, option, index);
    editor->setGeometry(option.rect);
}
 
 
QWidget* FitParameterDelegate::createEditorFromIndex(const QModelIndex& index,
                                                     QWidget* parent) const
{
    if (index.internalPointer()) {
        auto* item = static_cast<SessionItem*>(index.internalPointer());
        return GUI::View::PropertyEditorFactory::CreateEditor(*item, parent);
    }
    return nullptr;
}
 
//! Notifies everyone that the editor has completed editing the data.
 
void FitParameterDelegate::onCustomEditorDataChanged(const QVariant&)
{
    auto* editor = qobject_cast<CustomEditor*>(sender());
    ASSERT(editor);
    emit commitData(editor);
}
 
//! Paints custom text in a a place corresponding given index.
 
void FitParameterDelegate::paintCustomLabel(QPainter* painter, const QStyleOptionViewItem& option,
                                            const QModelIndex& index, const QString& text) const
{
    QStyleOptionViewItem opt = option;
    initStyleOption(&opt, index); // calling original method to take into accounts colors etc
    opt.text = displayText(text, option.locale); // by overriding text with ours
    const QWidget* widget = opt.widget;
    QStyle* style = widget ? widget->style() : QApplication::style();
    style->drawControl(QStyle::CE_ItemViewItem, &opt, painter, widget);
}