kis_brush_hud.cpp

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/*
 *  SPDX-FileCopyrightText: 2016 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#include "kis_brush_hud.h"
 
#include <QGuiApplication>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPointer>
#include <QLabel>
#include <QPainter>
#include <QPaintEvent>
#include <QScrollArea>
#include <QEvent>
#include <QToolButton>
#include <QAction>
 
#include "kis_uniform_paintop_property.h"
#include "kis_slider_based_paintop_property.h"
#include "kis_uniform_paintop_property_widget.h"
#include "kis_canvas_resource_provider.h"
#include "kis_paintop_preset.h"
#include "kis_paintop_settings.h"
#include "kis_signal_auto_connection.h"
#include "KisPaintOpPresetUpdateProxy.h"
#include "kis_icon_utils.h"
#include "kis_dlg_brush_hud_config.h"
#include "kis_brush_hud_properties_config.h"
#include "kis_elided_label.h"
 
#include "kis_canvas2.h"
#include "KisViewManager.h"
#include "kactioncollection.h"
 
#include "kis_debug.h"
 
 
struct KisBrushHud::Private
{
    QPointer<KisElidedLabel> lblPresetName;
    QPointer<QLabel> lblPresetIcon;
    QPointer<QWidget> wdgProperties;
    QPointer<QScrollArea> wdgPropertiesArea;
    QPointer<QVBoxLayout> propertiesLayout;
    QPointer<QToolButton> btnReloadPreset;
    QPointer<QToolButton> btnConfigure;
 
    KisCanvasResourceProvider *provider;
 
    KisSignalAutoConnectionsStore connections;
    KisSignalAutoConnectionsStore presetConnections;
 
    KisPaintOpPresetSP currentPreset;
};
 
KisBrushHud::KisBrushHud(KisCanvasResourceProvider *provider, QWidget *parent)
    : QWidget(parent, Qt::FramelessWindowHint),
      m_d(new Private)
{
    m_d->provider = provider;
 
    QVBoxLayout *layout = new QVBoxLayout(this);
 
    QHBoxLayout *labelLayout = new QHBoxLayout();
    m_d->lblPresetIcon = new QLabel(this);
    const QSize iconSize = QSize(22,22);
    m_d->lblPresetIcon->setMinimumSize(iconSize);
    m_d->lblPresetIcon->setMaximumSize(iconSize);
    m_d->lblPresetIcon->setScaledContents(true);
 
    m_d->lblPresetName = new KisElidedLabel("<Preset Name>", Qt::ElideMiddle, this);
 
    m_d->btnReloadPreset = new QToolButton(this);
    m_d->btnReloadPreset->setAutoRaise(true);
    m_d->btnReloadPreset->setToolTip(i18n("Reload Original Preset"));
 
    m_d->btnConfigure = new QToolButton(this);
    m_d->btnConfigure->setAutoRaise(true);
    m_d->btnConfigure->setToolTip(i18n("Configure the on-canvas brush editor"));
 
    connect(m_d->btnReloadPreset, SIGNAL(clicked()), SLOT(slotReloadPreset()));
    connect(m_d->btnConfigure, SIGNAL(clicked()), SLOT(slotConfigBrushHud()));
 
    labelLayout->addWidget(m_d->lblPresetIcon);
    labelLayout->addWidget(m_d->lblPresetName);
    labelLayout->addWidget(m_d->btnReloadPreset);
    labelLayout->addWidget(m_d->btnConfigure);
 
    layout->addLayout(labelLayout);
 
    m_d->wdgPropertiesArea = new QScrollArea(this);
    m_d->wdgPropertiesArea->setAlignment(Qt::AlignLeft | Qt::AlignTop);
    m_d->wdgPropertiesArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 
    m_d->wdgPropertiesArea->setWidgetResizable(true);
 
    m_d->wdgProperties = new QWidget(this);
    m_d->propertiesLayout = new QVBoxLayout(m_d->wdgProperties);
    m_d->propertiesLayout->setSpacing(0);
    m_d->propertiesLayout->setContentsMargins(0, 0, 22, 0);
    m_d->propertiesLayout->setSizeConstraint(QLayout::SetMinimumSize);
 
    // not adding any widgets until explicitly requested
 
    m_d->wdgPropertiesArea->setWidget(m_d->wdgProperties);
    layout->addWidget(m_d->wdgPropertiesArea);
 
    // unfortunately the sizeHint() function of QScrollArea is pretty broken
    // and it would add another event loop iteration to react to it anyway,
    // so let's just catch LayoutRequest events from the properties widget directly
    m_d->wdgProperties->installEventFilter(this);
 
    updateIcons();
 
    setCursor(Qt::ArrowCursor);
 
    // Prevent tablet events from being captured by the canvas
    setAttribute(Qt::WA_NoMousePropagation, true);
}
 
 
 
KisBrushHud::~KisBrushHud()
{
}
 
void KisBrushHud::updateIcons()
{
    this->setPalette(qApp->palette());
    for(int i=0; i<this->children().size(); i++) {
        QWidget *w = qobject_cast<QWidget*>(this->children().at(i));
        if (w) {
            w->setPalette(qApp->palette());
        }
    }
    for(int i=0; i<m_d->wdgProperties->children().size(); i++) {
        KisUniformPaintOpPropertyWidget *w = qobject_cast<KisUniformPaintOpPropertyWidget*>(m_d->wdgProperties->children().at(i));
        if (w) {
            w->slotThemeChanged(qApp->palette());
        }
    }
    m_d->btnReloadPreset->setIcon(KisIconUtils::loadIcon("reload-preset-16"));
    m_d->btnConfigure->setIcon(KisIconUtils::loadIcon("applications-system"));
}
 
void KisBrushHud::slotReloadProperties()
{
    m_d->presetConnections.clear();
    clearProperties();
    updateProperties();
}
 
void KisBrushHud::clearProperties() const
{
    while (m_d->propertiesLayout->count()) {
        QLayoutItem *item = m_d->propertiesLayout->takeAt(0);
 
        QWidget *w = item->widget();
        if (w) {
            w->deleteLater();
        }
 
        delete item;
    }
 
    m_d->currentPreset.clear();
}
 
void KisBrushHud::updateProperties()
{
    KisPaintOpPresetSP preset = m_d->provider->currentPreset();
 
    if (preset == m_d->currentPreset) return;
 
    m_d->presetConnections.clear();
    clearProperties();
 
    m_d->currentPreset = preset;
    m_d->presetConnections.addConnection(
        m_d->currentPreset->updateProxy(), SIGNAL(sigUniformPropertiesChanged()),
        this, SLOT(slotReloadProperties()));
 
    m_d->lblPresetIcon->setPixmap(QPixmap::fromImage(preset->image()));
    m_d->lblPresetName->setLongText(preset->name());
 
    QList<KisUniformPaintOpPropertySP> properties;
 
    {
        QList<KisUniformPaintOpPropertySP> allProperties = preset->uniformProperties();
        QList<KisUniformPaintOpPropertySP> discardedProperties;
 
        KisBrushHudPropertiesConfig cfg;
        cfg.filterProperties(preset->paintOp().id(),
                             allProperties,
                             &properties,
                             &discardedProperties);
    }
 
    Q_FOREACH(auto property, properties) {
        QWidget *w = 0;
 
        if (!property->isVisible()) continue;
 
        if (property->type() == KisUniformPaintOpProperty::Int) {
            w = new KisUniformPaintOpPropertyIntSlider(property, m_d->wdgProperties);
        } else if (property->type() == KisUniformPaintOpProperty::Double) {
            w = new KisUniformPaintOpPropertyDoubleSlider(property, m_d->wdgProperties);
        } else if (property->type() == KisUniformPaintOpProperty::Bool) {
            w = new KisUniformPaintOpPropertyCheckBox(property, m_d->wdgProperties);
        } else if (property->type() == KisUniformPaintOpProperty::Combo) {
            w = new KisUniformPaintOpPropertyComboBox(property, m_d->wdgProperties);
        }
 
        if (w) {
            w->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Fixed);
            m_d->propertiesLayout->addWidget(w);
        }
    }
 
    m_d->propertiesLayout->addStretch();
}
 
void KisBrushHud::showEvent(QShowEvent *event)
{
    m_d->connections.clear();
    m_d->connections.addUniqueConnection(
        m_d->provider->resourceManager(), SIGNAL(canvasResourceChanged(int,QVariant)),
        this, SLOT(slotCanvasResourceChanged(int,QVariant)));
 
    updateProperties();
 
    QWidget::showEvent(event);
}
 
void KisBrushHud::hideEvent(QHideEvent *event)
{
    m_d->connections.clear();
    QWidget::hideEvent(event);
 
    clearProperties();
}
 
void KisBrushHud::slotCanvasResourceChanged(int key, const QVariant &resource)
{
    Q_UNUSED(resource);
 
    if (key == KoCanvasResource::CurrentPaintOpPreset) {
        updateProperties();
    }
}
 
void KisBrushHud::paintEvent(QPaintEvent *event)
{
    QColor bgColor = palette().color(QPalette::Window);
 
    QPainter painter(this);
    painter.fillRect(rect() & event->rect(), bgColor);
    painter.end();
 
    QWidget::paintEvent(event);
}
 
bool KisBrushHud::event(QEvent *event)
{
    switch (event->type()) {
    case QEvent::TabletPress:
    case QEvent::TabletMove:
    case QEvent::TabletRelease:
        // Allow the tablet event to be translated to a mouse event on certain platforms
        break;
    case QEvent::MouseButtonPress:
    case QEvent::MouseMove:
    case QEvent::MouseButtonRelease:
    case QEvent::Wheel:
        event->accept();
        return true;
    default:
        break;
    }
 
    return QWidget::event(event);
}
 
bool KisBrushHud::eventFilter(QObject *watched, QEvent *event)
{
    // LayoutRequest event is sent from a layout to its parent widget
    // when size requirements have been determined, i.e. sizeHint is available
    if (watched == m_d->wdgProperties && event->type() == QEvent::LayoutRequest)
    {
        int totalMargin = 2 * m_d->wdgPropertiesArea->frameWidth();
        m_d->wdgPropertiesArea->setMinimumWidth(m_d->wdgProperties->sizeHint().width() + totalMargin);
    }
    return false;
}
 
void KisBrushHud::slotConfigBrushHud()
{
    if (!m_d->currentPreset) return;
 
    KisDlgConfigureBrushHud dlg(m_d->currentPreset);
    dlg.exec();
 
    slotReloadProperties();
}
 
void KisBrushHud::slotReloadPreset()
{
    KisCanvas2* canvas = dynamic_cast<KisCanvas2*>(m_d->provider->canvas());
    KIS_ASSERT_RECOVER_RETURN(canvas);
    canvas->viewManager()->actionCollection()->action("reload_preset_action")->trigger();
}