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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "splineeditor.h"
#include <theme.h>
#include <QAction>
#include <QApplication>
#include <QContextMenuEvent>
#include <QMenu>
#include <QMouseEvent>
#include <QPainter>
#include <QPropertyAnimation>
#include <QResizeEvent>
namespace QmlDesigner {
SplineEditor::SplineEditor(QWidget *parent)
: QWidget(parent)
, m_canvas(0, 0, 25, 25, 9, 6, 0, 1)
, m_animation(new QPropertyAnimation(this, "progress"))
{
m_animation->setStartValue(0.0);
m_animation->setEndValue(1.0);
m_animation->setLoopCount(1);
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
}
double SplineEditor::progress() const
{
return m_progress;
}
EasingCurve SplineEditor::easingCurve() const
{
return m_curve;
}
void SplineEditor::animate() const
{
m_animation->start();
}
void SplineEditor::setDuration(int duration)
{
m_animation->setDuration(duration);
}
void SplineEditor::setProgress(double progress)
{
m_progress = progress;
update();
}
void SplineEditor::setEasingCurve(const EasingCurve &curve)
{
m_curve = curve;
update();
}
void SplineEditor::resizeEvent(QResizeEvent *event)
{
m_canvas.resize(event->size());
QWidget::resizeEvent(event);
}
void SplineEditor::paintEvent(QPaintEvent *)
{
QPainter painter(this);
QPen pen(Theme::getColor(Theme::DScontrolOutline));
pen.setWidth(1);
painter.drawRect(0, 0, width() - 1, height() - 1);
painter.setRenderHint(QPainter::Antialiasing);
QColor curveColor = Theme::getColor(Theme::PanelTextColorLight);
if (!m_curve.isLegal())
curveColor = Theme::getColor(Theme::DSerrorColor);
QBrush background(Theme::getColor(Theme::BackgroundColorDark));
m_canvas.paintGrid(&painter, background);
m_canvas.paintCurve(&painter, m_curve, curveColor);
m_canvas.paintControlPoints(&painter, m_curve);
if (m_animation->state() == QAbstractAnimation::Running)
m_canvas.paintProgress(&painter, m_curve, m_progress);
}
void SplineEditor::mousePressEvent(QMouseEvent *e)
{
bool clearActive = true;
if (e->button() == Qt::LeftButton) {
EasingCurve mappedCurve = m_canvas.mapTo(m_curve);
int active = mappedCurve.hit(e->pos(), 10);
if (EasingCurve::IsValidIndex(active)) {
clearActive = false;
m_curve.setActive(active);
mouseMoveEvent(e);
}
m_mousePress = e->pos();
e->accept();
}
if (clearActive) {
m_curve.clearActive();
update();
}
}
void SplineEditor::mouseReleaseEvent(QMouseEvent *e)
{
if (e->button() == Qt::LeftButton) {
m_mouseDrag = false;
e->accept();
}
}
void dragHandle(EasingCurve &curve, int id, const QPointF &pos)
{
QPointF distance = pos - curve.point(id);
curve.setPoint(id, pos);
if (curve.isLeftHandle(id))
curve.movePoint(id + 2, -distance);
else
curve.movePoint(id - 2, -distance);
}
void SplineEditor::mouseMoveEvent(QMouseEvent *e)
{
// If we've moved more then 25 pixels, assume user is dragging
if (!m_mouseDrag
&& QPoint(m_mousePress - e->pos()).manhattanLength() > qApp->startDragDistance())
m_mouseDrag = true;
if (m_mouseDrag && m_curve.hasActive()) {
QPointF p = m_canvas.mapFrom(e->pos());
int active = m_curve.active();
if ((active == 0 || active == m_curve.count() - 2)
&& e->modifiers().testFlag(Qt::ShiftModifier)) {
if (active == 0) {
QPointF opposite = QPointF(1.0, 1.0) - p;
dragHandle(m_curve, active, p);
dragHandle(m_curve, m_curve.count() - 2, opposite);
} else {
QPointF opposite = QPointF(1.0, 1.0) - p;
dragHandle(m_curve, active, p);
dragHandle(m_curve, 0, opposite);
}
} else if (m_curve.isHandle(active)) {
int poc = m_curve.curvePoint(active);
if (!m_curve.isSmooth(poc))
m_curve.setPoint(active, p);
else
dragHandle(m_curve, active, p);
} else {
QPointF targetPoint = p;
QPointF distance = targetPoint - m_curve.point(m_curve.active());
m_curve.setPoint(active, targetPoint);
m_curve.movePoint(active + 1, distance);
m_curve.movePoint(active - 1, distance);
}
update();
emit easingCurveChanged(m_curve);
}
}
void SplineEditor::contextMenuEvent(QContextMenuEvent *e)
{
m_curve.clearActive();
auto *menu = new QMenu(this);
EasingCurve mappedCurve = m_canvas.mapTo(m_curve);
int index = mappedCurve.hit(e->pos(), 10);
if (index > 0 && !m_curve.isHandle(index)) {
QAction *deleteAction = menu->addAction(tr("Delete Point"));
connect(deleteAction, &QAction::triggered, [this, index]() {
m_curve.deletePoint(index);
update();
emit easingCurveChanged(m_curve);
});
QAction *smoothAction = menu->addAction(tr("Smooth Point"));
smoothAction->setCheckable(true);
smoothAction->setChecked(m_curve.isSmooth(index));
connect(smoothAction, &QAction::triggered, [this, index]() {
m_curve.makeSmooth(index);
update();
emit easingCurveChanged(m_curve);
});
QAction *cornerAction = menu->addAction(tr("Corner Point"));
connect(cornerAction, &QAction::triggered, [this, index]() {
m_curve.breakTangent(index);
update();
emit easingCurveChanged(m_curve);
});
} else {
QAction *addAction = menu->addAction(tr("Add Point"));
connect(addAction, &QAction::triggered, [&]() {
m_curve.addPoint(m_canvas.mapFrom(e->pos()));
m_curve.makeSmooth(m_curve.active());
update();
emit easingCurveChanged(m_curve);
});
}
QAction *zoomAction = menu->addAction(tr("Reset Zoom"));
connect(zoomAction, &QAction::triggered, [&]() {
m_canvas.setScale(1.0);
update();
});
menu->exec(e->globalPos());
menu->deleteLater();
e->accept();
}
void SplineEditor::mouseDoubleClickEvent(QMouseEvent *event)
{
m_animation->start();
QWidget::mouseDoubleClickEvent(event);
}
void SplineEditor::wheelEvent(QWheelEvent *event)
{
double tmp = event->angleDelta().y() > 0 ? 0.05 : -0.05;
m_canvas.setScale(m_canvas.scale() + tmp);
event->accept();
update();
}
} // End namespace QmlDesigner.
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