160 lines
3.6 KiB
C++
160 lines
3.6 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "ui/effects/fade_animation.h"
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namespace Ui {
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namespace {
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constexpr int kWideScale = 5;
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} // namespace
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FadeAnimation::FadeAnimation(TWidget *widget, float64 scale)
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: _widget(widget)
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, _scale(scale) {
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}
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bool FadeAnimation::paint(Painter &p) {
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if (_cache.isNull()) return false;
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const auto cache = _cache;
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auto opacity = _animation.current(getms(), _visible ? 1. : 0.);
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p.setOpacity(opacity);
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if (_scale < 1.) {
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PainterHighQualityEnabler hq(p);
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auto targetRect = QRect(
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(1 - kWideScale) / 2 * _size.width(),
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(1 - kWideScale) / 2 * _size.height(),
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kWideScale * _size.width(),
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kWideScale * _size.height());
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auto scale = opacity + (1. - opacity) * _scale;
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auto shownWidth = anim::interpolate(
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(1 - kWideScale) / 2 * _size.width(),
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0,
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scale);
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auto shownHeight = anim::interpolate(
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(1 - kWideScale) / 2 * _size.height(),
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0,
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scale);
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auto margins = QMargins(
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shownWidth,
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shownHeight,
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shownWidth,
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shownHeight);
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p.drawPixmap(targetRect.marginsAdded(margins), cache);
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} else {
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p.drawPixmap(0, 0, cache);
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}
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return true;
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}
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void FadeAnimation::refreshCache() {
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if (!_cache.isNull()) {
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_cache = QPixmap();
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_cache = grabContent();
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Assert(!_cache.isNull());
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}
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}
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QPixmap FadeAnimation::grabContent() {
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SendPendingMoveResizeEvents(_widget);
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_size = _widget->size();
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if (_size.isEmpty()) {
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auto image = QImage(
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cIntRetinaFactor(),
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cIntRetinaFactor(),
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QImage::Format_ARGB32_Premultiplied);
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image.fill(Qt::transparent);
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return App::pixmapFromImageInPlace(std::move(image));
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}
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auto widgetContent = GrabWidget(_widget);
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if (_scale < 1.) {
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auto result = QImage(kWideScale * _size * cIntRetinaFactor(), QImage::Format_ARGB32_Premultiplied);
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result.setDevicePixelRatio(cRetinaFactor());
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result.fill(Qt::transparent);
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{
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Painter p(&result);
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p.drawPixmap((kWideScale - 1) / 2 * _size.width(), (kWideScale - 1) / 2 * _size.height(), widgetContent);
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}
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return App::pixmapFromImageInPlace(std::move(result));
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}
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return widgetContent;
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}
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void FadeAnimation::setFinishedCallback(FinishedCallback &&callback) {
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_finishedCallback = std::move(callback);
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}
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void FadeAnimation::setUpdatedCallback(UpdatedCallback &&callback) {
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_updatedCallback = std::move(callback);
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}
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void FadeAnimation::show() {
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_visible = true;
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stopAnimation();
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}
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void FadeAnimation::hide() {
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_visible = false;
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stopAnimation();
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}
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void FadeAnimation::stopAnimation() {
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_animation.finish();
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if (!_cache.isNull()) {
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_cache = QPixmap();
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if (_finishedCallback) {
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_finishedCallback();
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}
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}
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if (_visible == _widget->isHidden()) {
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_widget->setVisible(_visible);
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}
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}
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void FadeAnimation::fadeIn(int duration) {
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if (_visible) return;
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_visible = true;
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startAnimation(duration);
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}
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void FadeAnimation::fadeOut(int duration) {
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if (!_visible) return;
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_visible = false;
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startAnimation(duration);
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}
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void FadeAnimation::startAnimation(int duration) {
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if (_cache.isNull()) {
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_cache = grabContent();
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Assert(!_cache.isNull());
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}
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auto from = _visible ? 0. : 1.;
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auto to = _visible ? 1. : 0.;
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_animation.start([this]() { updateCallback(); }, from, to, duration);
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updateCallback();
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if (_widget->isHidden()) {
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_widget->show();
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}
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}
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void FadeAnimation::updateCallback() {
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if (_animation.animating()) {
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_widget->update();
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if (_updatedCallback) {
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_updatedCallback(_animation.current(_visible ? 1. : 0.));
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}
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} else {
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stopAnimation();
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}
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}
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} // namespace Ui
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