122 lines
2.8 KiB
C++
122 lines
2.8 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2021 Olive Team
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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 "common/qtutils.h"
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namespace olive {
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const int ScrollingLabel::kMinLineHeight = 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::AnimationUpdate);
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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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SetText(text);
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}
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void ScrollingLabel::SetText(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::QFontMetricsWidth(fm, s));
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}
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setMinimumSize(width, text_height_ * kMinLineHeight);
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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::QFontMetricsWidth(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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SetOpacityOfScanLine(map.scanLine(y), map.width(), 4, mul);
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SetOpacityOfScanLine(map.scanLine(map.height()-1-y), 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::SetOpacityOfScanLine(uchar *scan_line, int width, 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::AnimationUpdate()
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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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