Mike-Solar
c0dcd33de0
Move the pure-header utilities shared by app/ and engine/ out of engine/common/ into a new shared/include/oakutil/ layer (define, lerp, decibel, digit, range, crashpadutils, autoscroll, qtutils, filefunctions declarations, and a trimmed xmlutils exposing a CancelAtom-free void* overload). engine/common/ keeps forwarding headers so internal include paths are unchanged; app/ now includes oakutil/* directly. engine/node/project.h gains an explicit NodeGroup forward declaration previously obtained transitively through the old xmlutils.h.
126 lines
2.9 KiB
C++
126 lines
2.9 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2022 Olive Team
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Modifications Copyright (C) 2025 mikesolar
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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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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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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 "scrollinglabel.h"
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#include <QPainter>
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#include "oakutil/qtutils.h"
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namespace olive
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{
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const int ScrollingLabel::k_min_line_height = 10;
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ScrollingLabel::ScrollingLabel(QWidget *parent)
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: QWidget(parent)
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, animate_(0)
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{
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timer_.setInterval(50);
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connect(&timer_, &QTimer::timeout, this, &ScrollingLabel::animation_update);
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}
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ScrollingLabel::ScrollingLabel(const QStringList &text, QWidget *parent)
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: ScrollingLabel(parent)
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{
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set_text(text);
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}
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void ScrollingLabel::set_text(const QStringList &text)
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{
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text_ = text;
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QFontMetrics fm = fontMetrics();
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text_height_ = fm.height();
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int width = 0;
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foreach (const QString &s, text_) {
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width = qMax(width, QtUtils::q_font_metrics_width(fm, s));
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}
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setMinimumSize(width, text_height_ * k_min_line_height);
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}
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void ScrollingLabel::paintEvent(QPaintEvent *e)
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{
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QImage map(width(), height(), QImage::Format_RGBA8888_Premultiplied);
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map.fill(Qt::transparent);
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{
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QPainter p(&map);
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p.setPen(palette().text().color());
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QFontMetrics fm = p.fontMetrics();
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int half_width = width();
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for (int i = 0; i < text_.size(); i++) {
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int text_y = fm.ascent() + height() - animate_ + (fm.height() * i);
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int text_bottom = text_y + fm.descent();
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int text_top = text_y - fm.ascent();
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if (text_bottom < 0 || text_top >= height()) {
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continue;
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}
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const QString &s = text_.at(i);
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int width = QtUtils::q_font_metrics_width(fm, s);
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p.drawText(half_width / 2 - width / 2, text_y, s);
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}
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for (int y = 0; y < text_height_; y++) {
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double mul = double(y) / double(text_height_);
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set_opacity_of_scan_line(map.scanLine(y), map.width(), 4, mul);
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set_opacity_of_scan_line(map.scanLine(map.height() - 1 - y),
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map.width(), 4, mul);
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}
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}
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QPainter wp(this);
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wp.drawImage(0, 0, map);
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}
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void ScrollingLabel::set_opacity_of_scan_line(uchar *scan_line, int width,
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int channels, double mul)
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{
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for (int x = 0; x < width; x++) {
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uchar *pixel = &scan_line[x * 4];
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for (int c = 0; c < channels; c++) {
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pixel[c] *= mul;
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}
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}
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}
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void ScrollingLabel::animation_update()
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{
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animate_++;
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if (animate_ >= height() + text_.size() * text_height_) {
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animate_ = 0;
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}
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update();
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}
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}
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