squawk/ui/utils/shadowoverlay.cpp

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/*
* Squawk messenger.
* Copyright (C) 2019 Yury Gubich <blue@macaw.me>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "shadowoverlay.h"
ShadowOverlay::ShadowOverlay(unsigned int r, unsigned int t, const QColor& c, QWidget* parent):
QWidget(parent),
top(false),
right(false),
bottom(false),
left(false),
thickness(t),
radius(r),
color(c),
shadow(1, 1, QImage::Format_ARGB32_Premultiplied)
{
setAttribute(Qt::WA_NoSystemBackground);
setAttribute(Qt::WA_TransparentForMouseEvents);
}
void ShadowOverlay::paintEvent(QPaintEvent* event)
{
QWidget::paintEvent(event);
QPainter painter(this);
painter.drawImage(0, 0, shadow);
}
void ShadowOverlay::resizeEvent(QResizeEvent* event)
{
QWidget::resizeEvent(event);
updateImage();
}
void ShadowOverlay::updateImage()
{
int w = width();
int h = height();
shadow = QImage({w, h + int(thickness)}, QImage::Format_ARGB32_Premultiplied);
shadow.fill(0);
QPainter tmpPainter(&shadow);
tmpPainter.setCompositionMode(QPainter::CompositionMode_Source);
if (top) {
QRectF shadow(0, 0, w, thickness);
tmpPainter.fillRect(shadow, color);
}
if (right) {
QRectF shadow(w - thickness, 0, thickness, h);
tmpPainter.fillRect(shadow, color);
}
if (bottom) {
QRectF shadow(0, h - thickness, w, thickness * 2); //i have no idea why, but it leaves some unpainted stripe without some spare space
tmpPainter.fillRect(shadow, color);
}
if (left) {
QRectF shadow(0, 0, thickness, h);
tmpPainter.fillRect(shadow, color);
}
Utils::exponentialblur(shadow, radius, false, 0);
tmpPainter.end();
}
void ShadowOverlay::setFrames(bool t, bool r, bool b, bool l)
{
top = t;
right = r;
bottom = b;
left = l;
updateImage();
update();
}