107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop 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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It 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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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2016 John Preston, https://desktop.telegram.org
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*/
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#include "stdafx.h"
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#include "media/view/media_clip_volume_controller.h"
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#include "styles/style_mediaview.h"
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namespace Media {
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namespace Clip {
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VolumeController::VolumeController(QWidget *parent) : TWidget(parent) {
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resize(st::mediaviewVolumeSize);
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setCursor(style::cur_pointer);
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setMouseTracking(true);
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}
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void VolumeController::setVolume(float64 volume) {
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_volume = volume;
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update();
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}
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void VolumeController::paintEvent(QPaintEvent *e) {
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Painter p(this);
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int32 top = st::mediaviewVolumeIconTop;
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int32 left = (width() - st::mediaviewVolumeIcon.width()) / 2;
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int32 mid = left + qRound(st::mediaviewVolumeIcon.width() * _volume);
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int32 right = left + st::mediaviewVolumeIcon.width();
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if (mid > left) {
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auto over = _a_over.current(getms(), _over ? 1. : 0.);
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p.setOpacity(over * st::mediaviewActiveOpacity + (1. - over) * st::mediaviewInactiveOpacity);
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p.setClipRect(rtlrect(left, top, mid - left, st::mediaviewVolumeIcon.height(), width()));
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st::mediaviewVolumeOnIcon.paint(p, QPoint(left, top), width());
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}
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if (right > mid) {
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p.setClipRect(rtlrect(mid, top, right - mid, st::mediaviewVolumeIcon.height(), width()));
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st::mediaviewVolumeIcon.paint(p, QPoint(left, top), width());
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}
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}
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void VolumeController::mouseMoveEvent(QMouseEvent *e) {
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if (_downCoord < 0) {
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return;
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}
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int delta = e->pos().x() - _downCoord;
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int left = (width() - st::mediaviewVolumeIcon.width()) / 2;
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float64 startFrom = snap((_downCoord - left) / float64(st::mediaviewVolumeIcon.width()), 0., 1.);
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float64 add = delta / float64(4 * st::mediaviewVolumeIcon.width());
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auto newVolume = snap(startFrom + add, 0., 1.);
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changeVolume(newVolume);
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}
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void VolumeController::mousePressEvent(QMouseEvent *e) {
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_downCoord = snap(e->pos().x(), 0, width());
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int left = (width() - st::mediaviewVolumeIcon.width()) / 2;
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auto newVolume = snap((_downCoord - left) / float64(st::mediaviewVolumeIcon.width()), 0., 1.);
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changeVolume(newVolume);
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}
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void VolumeController::changeVolume(float64 newVolume) {
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if (newVolume != _volume) {
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setVolume(newVolume);
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emit volumeChanged(_volume);
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}
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}
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void VolumeController::mouseReleaseEvent(QMouseEvent *e) {
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_downCoord = -1;
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}
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void VolumeController::enterEvent(QEvent *e) {
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setOver(true);
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}
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void VolumeController::leaveEvent(QEvent *e) {
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setOver(false);
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}
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void VolumeController::setOver(bool over) {
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if (_over == over) return;
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_over = over;
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auto from = _over ? 0. : 1., to = _over ? 1. : 0.;
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_a_over.start([this] { update(); }, from, to, st::mediaviewOverDuration);
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}
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} // namespace Clip
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} // namespace Media
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