kis_cmb_gradient.cpp

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/*
 *  SPDX-FileCopyrightText: 2015 Boudewijn Rempt <boud@valdyas.org>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
#include "kis_cmb_gradient.h"
 
#include <QPainter>
#include <QResizeEvent>
#include <QStyleOptionComboBox>
#include <QApplication>
 
#include <KoCheckerBoardPainter.h>
#include <KoResource.h>
#include <resources/KoAbstractGradient.h>
#include <KisGradientChooser.h>
 
KisCmbGradient::KisCmbGradient(QWidget *parent)
    : KisPopupButton(parent)
    , m_gradientChooser(new KisGradientChooser(this))
    , m_checkersPainter(4)
{
    m_gradientChooser->setContentsMargins(10, 10, 10, 10);
    connect(m_gradientChooser, SIGNAL(resourceSelected(KoResourceSP )), SLOT(gradientSelected(KoResourceSP )));
    connect(m_gradientChooser, &KisGradientChooser::gradientEdited,
            [this](KoAbstractGradientSP resource) { gradientSelected(resource); });
    setPopupWidget(m_gradientChooser);
}
 
void KisCmbGradient::setGradient(KoAbstractGradientSP gradient)
{
    m_gradientChooser->setCurrentResource(gradient);
}
 
KoAbstractGradientSP KisCmbGradient::gradient(bool includeHidden) const
{
    return m_gradientChooser->currentResource(includeHidden).dynamicCast<KoAbstractGradient>();
}
 
void KisCmbGradient::setCanvasResourcesInterface(KoCanvasResourcesInterfaceSP canvasResourcesInterface)
{
    m_gradientChooser->setCanvasResourcesInterface(canvasResourcesInterface);
}
 
void KisCmbGradient::gradientSelected(KoResourceSP resource)
{
    KoAbstractGradientSP gradient = resource.dynamicCast<KoAbstractGradient>();
    if (!gradient) return;
 
    QImage preview = gradient->generatePreview(iconSize().width(), iconSize().height(), m_gradientChooser->canvasResourcesInterface());
 
    QImage thumbnail(preview.size(), QImage::Format_ARGB32);
 
    {
        QPainter gc(&thumbnail);
        m_checkersPainter.paint(gc, preview.rect());
        gc.drawImage(QPoint(), preview);
    }
 
    setIcon(QIcon(QPixmap::fromImage(thumbnail)));
 
    Q_EMIT gradientChanged(gradient);
}
 
QSize KisCmbGradient::sizeHint() const
{
    ensurePolished();
    QFontMetrics fm = fontMetrics();
    int maxW = 7 * fm.horizontalAdvance(QChar('x')) + 18;
    int maxH = qMax(fm.lineSpacing(), 14) + 2;
 
    QStyleOptionComboBox options;
    options.initFrom(this);
 
    return style()->sizeFromContents(QStyle::CT_ComboBox, &options, QSize(maxW, maxH), this);
}
 
void KisCmbGradient::resizeEvent(QResizeEvent *event)
{
    setIconSize(QSize(event->size().width() - 30, event->size().height() - 4));
    KisPopupButton::resizeEvent(event);
}