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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <QWidget>
#include <QPainter>
#include <QMouseEvent>
#include <QDebug>
class StaticWidget : public QWidget
{
Q_OBJECT
public:
int hue;
bool pressed;
StaticWidget(QWidget *parent = nullptr)
:QWidget(parent)
{
setAttribute(Qt::WA_StaticContents);
setAttribute(Qt::WA_OpaquePaintEvent);
hue = 200;
pressed = false;
}
// Update 4 rects in a checkerboard pattern, using either
// a QRegion or separate rects (see the useRegion switch)
void updatePattern(QPoint pos)
{
const int rectSize = 10;
QRect rect(pos.x() - rectSize, pos.y() - rectSize, rectSize *2, rectSize * 2);
const QRect updateRects[] = {
rect.translated(rectSize * 2, rectSize * 2),
rect.translated(rectSize * 2, -rectSize * 2),
rect.translated(-rectSize * 2, rectSize * 2),
rect.translated(-rectSize * 2, -rectSize * 2),
};
bool useRegion = false;
if (useRegion) {
QRegion region;
region.setRects(updateRects, 4);
update(region);
} else {
for (QRect rect : updateRects)
update(rect);
}
}
void resizeEvent(QResizeEvent *)
{
// qDebug() << "static widget resize from" << e->oldSize() << "to" << e->size();
}
void mousePressEvent(QMouseEvent *event)
{
// qDebug() << "mousePress at" << event->pos();
pressed = true;
updatePattern(event->pos());
}
void mouseReleaseEvent(QMouseEvent *)
{
pressed = false;
}
void mouseMoveEvent(QMouseEvent *event)
{
if (pressed)
updatePattern(event->pos());
}
void paintEvent(QPaintEvent *e)
{
QPainter p(this);
static int color = 200;
color = (color + 41) % 205 + 50;
// color = ((color + 45) %150) + 100;
qDebug() << "static widget repaint" << e->rect();
if (pressed)
p.fillRect(e->rect(), QColor::fromHsv(100, 255, color));
else
p.fillRect(e->rect(), QColor::fromHsv(hue, 255, color));
p.setPen(QPen(QColor(Qt::white)));
for (int y = e->rect().top(); y <= e->rect().bottom() + 1; ++y) {
if (y % 20 == 0)
p.drawLine(e->rect().left(), y, e->rect().right(), y);
}
for (int x = e->rect().left(); x <= e->rect().right() +1 ; ++x) {
if (x % 20 == 0)
p.drawLine(x, e->rect().top(), x, e->rect().bottom());
}
}
};
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