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