mirror of
https://github.com/AyuGram/AyuGramDesktop.git
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23rd
82 lines
1.7 KiB
C++
82 lines
1.7 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/widgets/cross_fade_label.h"
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#include "styles/style_widgets.h"
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namespace Ui {
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namespace {
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constexpr auto kDuration = crl::time(200);
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} // namespace
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CrossFadeLabel::CrossFadeLabel(
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QWidget *parent,
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const style::LabelSimple &st)
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: RpWidget(parent)
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, _st(st) {
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}
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void CrossFadeLabel::setText(
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const QString &text,
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anim::type animated) {
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if (_current == text) {
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return;
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}
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_previous = _current;
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_previousWidth = _currentWidth;
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_current = text;
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_currentWidth = _st.font->width(_current);
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if (!height()) {
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resize(width(), _st.font->height);
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}
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if (animated == anim::type::instant) {
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_animation.stop();
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update();
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return;
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}
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_animation.start(
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[=] { update(); },
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0.,
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1.,
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kDuration,
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anim::easeOutCubic);
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}
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void CrossFadeLabel::setDirection(int direction) {
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_direction = direction;
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}
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void CrossFadeLabel::paintEvent(QPaintEvent *e) {
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auto p = QPainter(this);
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p.setPen(_st.textFg);
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p.setFont(_st.font);
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const auto slide = _st.font->height;
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const auto progress = _animation.value(1.);
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const auto y = _st.font->ascent;
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if (progress < 1. && !_previous.isEmpty()) {
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p.setOpacity(1. - progress);
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const auto dx = int(slide * _direction * progress);
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p.drawText(
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(width() - _previousWidth) / 2 + dx,
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y,
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_previous);
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}
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if (!_current.isEmpty()) {
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p.setOpacity(progress);
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const auto dx = int(slide * -_direction * (1. - progress));
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p.drawText(
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(width() - _currentWidth) / 2 + dx,
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y,
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_current);
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}
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}
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} // namespace Ui
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