ecvColorScaleSelector.cpp

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#include "ecvColorScaleSelector.h"
 
// Qt
#include <QComboBox>
#include <QHBoxLayout>
#include <QToolButton>
 
// Local
#include "ecvColorScalesManager.h"
 
ccColorScaleSelector::ccColorScaleSelector(
        ccColorScalesManager* manager,
        QWidget* parent,
        QString defaultButtonIconPath /*=QString()*/)
    : QFrame(parent),
      m_manager(manager),
      m_comboBox(new QComboBox()),
      m_button(new QToolButton()) {
    assert(m_manager);
 
    setLayout(new QHBoxLayout());
    layout()->setContentsMargins(0, 0, 0, 0);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
 
    // combox box
    if (m_comboBox) {
        layout()->addWidget(m_comboBox);
    }
 
    // tool button
    if (m_button) {
        m_button->setIcon(QIcon(defaultButtonIconPath));
        layout()->addWidget(m_button);
    }
}
 
void ccColorScaleSelector::init() {
    // fill combox box
    if (m_comboBox) {
        m_comboBox->disconnect(this);
 
        m_comboBox->clear();
        // add all available color scales
        assert(m_manager);
 
        // sort the scales by their name
        // DGM: See doc about qSort --> "An alternative to using qSort() is to
        // put the items to sort in a QMap, using the sort key as the QMap key."
        QMap<QString, QString> scales;
        for (ccColorScalesManager::ScalesMap::const_iterator it =
                     m_manager->map().constBegin();
             it != m_manager->map().constEnd(); ++it) {
            scales.insert((*it)->getName(), (*it)->getUuid());
        }
 
        for (QMap<QString, QString>::const_iterator scale = scales.constBegin();
             scale != scales.constEnd(); ++scale) {
            m_comboBox->addItem(scale.key(), scale.value());
        }
 
        connect(m_comboBox, SIGNAL(activated(int)), this,
                SIGNAL(colorScaleSelected(int)));
    }
    // advanced tool button
    if (m_button) {
        m_button->disconnect(this);
        connect(m_button, SIGNAL(clicked()), this,
                SIGNAL(colorScaleEditorSummoned()));
    }
}
 
ccColorScale::Shared ccColorScaleSelector::getSelectedScale() const {
    return getScale(m_comboBox ? m_comboBox->currentIndex() : -1);
}
 
ccColorScale::Shared ccColorScaleSelector::getScale(int index) const {
    if (!m_comboBox || index < 0 || index >= m_comboBox->count())
        return ccColorScale::Shared(0);
 
    // get UUID associated to the combo-box item
    QString UUID = m_comboBox->itemData(index).toString();
 
    return m_manager ? m_manager->getScale(UUID) : ccColorScale::Shared(0);
}
 
void ccColorScaleSelector::setSelectedScale(QString uuid) {
    if (!m_comboBox) return;
 
    // search right index by UUID
    int pos = m_comboBox->findData(uuid);
    if (pos < 0) return;
    m_comboBox->setCurrentIndex(pos);
 
    emit colorScaleSelected(pos);
}