1286 lines
35 KiB
C++
1286 lines
35 KiB
C++
// This file is part of Desktop App Toolkit,
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// a set of libraries for developing nice desktop applications.
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//
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// For license and copyright information please follow this link:
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// https://github.com/desktop-app/legal/blob/master/LEGAL
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//
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#include "ui/widgets/elastic_scroll.h"
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#include "ui/painter.h"
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#include "ui/ui_utility.h"
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#include "base/platform/base_platform_info.h"
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#include "base/qt/qt_common_adapters.h"
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#include "styles/style_widgets.h"
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#include <QtGui/QWindow>
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#include <QtCore/QtMath>
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#include <QtWidgets/QApplication>
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namespace Ui {
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namespace {
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constexpr auto kOverscrollReturnDuration = crl::time(250);
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//constexpr auto kOverscrollPower = 0.6;
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constexpr auto kOverscrollFromThreshold = -(1 << 30);
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constexpr auto kOverscrollTillThreshold = (1 << 30);
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constexpr auto kTouchOverscrollMultiplier = 2;
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constexpr auto kLogA = 16.;
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constexpr auto kLogB = 10.;
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[[nodiscard]] float64 RawFrom(float64 value) {
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const auto scale = style::Scale() / 100.;
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value /= scale;
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const auto result = kLogA * log(1. + value / kLogB);
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//const auto result = pow(value, kOverscrollPower);
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return result * scale;
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}
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[[nodiscard]] float64 RawTo(float64 value) {
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const auto scale = style::Scale() / 100.;
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value /= scale;
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const auto result = (exp(value / kLogA) - 1.) * kLogB;
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//const auto result = pow(value, 1. / kOverscrollPower);
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return result * scale;
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}
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[[nodiscard]] int OverscrollFromAccumulated(int accumulated) {
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if (!accumulated) {
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return 0;
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}
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return (accumulated > 0 ? 1. : -1.)
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* int(base::SafeRound(RawFrom(std::abs(accumulated))));
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}
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[[nodiscard]] int OverscrollToAccumulated(int overscroll) {
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if (!overscroll) {
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return 0;
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}
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return (overscroll > 0 ? 1. : -1.)
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* int(base::SafeRound(RawTo(std::abs(overscroll))));
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}
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} // namespace
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// Flick scroll taken from
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// http://qt-project.org/doc/qt-4.8
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// /demos-embedded-anomaly-src-flickcharm-cpp.html
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ElasticScrollBar::ElasticScrollBar(
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QWidget *parent,
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const style::ScrollArea &st,
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Qt::Orientation orientation)
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: RpWidget(parent)
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, _st(st)
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, _hideTimer([=] { toggle(false); })
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, _shown(!_st.hiding)
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, _vertical(orientation == Qt::Vertical) {
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setAttribute(Qt::WA_NoMousePropagation);
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}
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void ElasticScrollBar::refreshGeometry() {
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update();
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const auto skip = _st.deltax;
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const auto fullSkip = _st.deltat + _st.deltab;
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const auto extSize = _vertical ? height() : width();
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const auto thickness = (_vertical ? width() : height()) - 2 * skip;
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const auto minSize = fullSkip + 2 * thickness;
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if (_state.fullSize <= 0
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|| _state.visibleFrom >= _state.visibleTill
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|| extSize < minSize) {
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_bar = _area = QRect();
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hide();
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return;
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}
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const auto available = extSize - fullSkip;
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_area = _vertical
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? QRect(skip, _st.deltat, thickness, available)
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: QRect(_st.deltat, skip, available, thickness);
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const auto barMin = std::min(st::scrollBarMin, available / 2);
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const auto visibleHeight = _state.visibleTill - _state.visibleFrom;
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const auto scrollableHeight = _state.fullSize - visibleHeight;
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const auto barWanted = (available * visibleHeight) / _state.fullSize;
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if (barWanted >= available) {
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_bar = _area = QRect();
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hide();
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return;
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}
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const auto bar = std::max(barMin, barWanted);
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const auto outsideBar = available - bar;
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const auto scale = [&](int value) {
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return (outsideBar * value) / scrollableHeight;
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};
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const auto barFrom = scale(_state.visibleFrom);
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const auto barTill = barFrom + bar;
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const auto cutFrom = std::clamp(barFrom, 0, available - thickness);
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const auto cutTill = std::clamp(barTill, thickness, available);
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const auto cutBar = cutTill - cutFrom;
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_bar = _vertical
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? QRect(_area.x(), _area.y() + cutFrom, _area.width(), cutBar)
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: QRect(_area.x() + cutFrom, _area.y(), cutBar, _area.height());
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if (isHidden()) {
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show();
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}
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}
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bool ElasticScrollBar::barHighlighted() const {
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return _overBar || _dragging;
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}
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void ElasticScrollBar::toggle(bool shown, anim::type animated) {
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const auto instant = (animated == anim::type::instant);
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const auto changed = (_shown != shown);
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_shown = shown;
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if (instant) {
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_shownAnimation.stop();
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}
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if (_shown && _st.hiding) {
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_hideTimer.callOnce(_st.hiding);
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}
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if (changed && !instant) {
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_shownAnimation.start(
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[=] { update(); },
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_shown ? 0. : 1.,
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_shown ? 1. : 0.,
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_st.duration);
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}
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update();
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}
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void ElasticScrollBar::toggleOver(bool over, anim::type animated) {
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const auto instant = (animated == anim::type::instant);
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const auto changed = (_over != over);
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_over = over;
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if (instant) {
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_overAnimation.stop();
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}
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if (!instant && changed) {
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_overAnimation.start(
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[=] { update(); },
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_over ? 0. : 1.,
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_over ? 1. : 0.,
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_st.duration);
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}
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update();
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}
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void ElasticScrollBar::toggleOverBar(bool over, anim::type animated) {
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const auto instant = (animated == anim::type::instant);
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const auto wasHighlight = barHighlighted();
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_overBar = over;
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if (instant) {
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_barHighlightAnimation.stop();
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} else {
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startBarHighlightAnimation(wasHighlight);
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}
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update();
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}
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void ElasticScrollBar::toggleDragging(bool dragging, anim::type animated) {
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const auto instant = (animated == anim::type::instant);
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const auto wasHighlight = barHighlighted();
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_dragging = dragging;
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if (instant) {
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_barHighlightAnimation.stop();
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} else {
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startBarHighlightAnimation(wasHighlight);
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}
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update();
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}
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void ElasticScrollBar::startBarHighlightAnimation(bool wasHighlighted) {
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if (barHighlighted() == wasHighlighted) {
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return;
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}
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const auto highlighted = !wasHighlighted;
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_barHighlightAnimation.start(
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[=] { update(); },
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highlighted ? 0. : 1.,
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highlighted ? 1. : 0.,
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_st.duration);
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}
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rpl::producer<int> ElasticScrollBar::visibleFromDragged() const {
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return _visibleFromDragged.events();
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}
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void ElasticScrollBar::updateState(ScrollState state) {
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if (_state != state) {
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_state = state;
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refreshGeometry();
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toggle(true);
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}
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}
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void ElasticScrollBar::paintEvent(QPaintEvent *e) {
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if (_bar.isEmpty()) {
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hide();
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return;
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}
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const auto barHighlight = _barHighlightAnimation.value(
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barHighlighted() ? 1. : 0.);
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const auto over = std::max(
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_overAnimation.value(_over ? 1. : 0.),
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barHighlight);
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const auto shown = std::max(
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_shownAnimation.value(_shown ? 1. : 0.),
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over);
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if (shown < 1. / 255) {
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return;
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}
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QPainter p(this);
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p.setPen(Qt::NoPen);
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auto bg = anim::color(_st.bg, _st.bgOver, over);
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bg.setAlpha(anim::interpolate(0, bg.alpha(), shown));
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auto bar = anim::color(_st.barBg, _st.barBgOver, barHighlight);
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bar.setAlpha(anim::interpolate(0, bar.alpha(), shown));
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const auto radius = (_st.round < 0)
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? (std::min(_area.width(), _area.height()) / 2.)
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: _st.round;
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if (radius) {
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PainterHighQualityEnabler hq(p);
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p.setBrush(bg);
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p.drawRoundedRect(_area, radius, radius);
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p.setBrush(bar);
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p.drawRoundedRect(_bar, radius, radius);
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} else {
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p.fillRect(_area, bg);
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p.fillRect(_bar, bar);
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}
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}
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void ElasticScrollBar::enterEventHook(QEnterEvent *e) {
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_hideTimer.cancel();
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setMouseTracking(true);
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toggleOver(true);
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}
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void ElasticScrollBar::leaveEventHook(QEvent *e) {
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if (!_dragging) {
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setMouseTracking(false);
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}
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toggleOver(false);
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toggleOverBar(false);
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if (_st.hiding && _shown) {
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_hideTimer.callOnce(_st.hiding);
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}
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}
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int ElasticScrollBar::scaleToBar(int change) const {
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const auto scrollable = _state.fullSize
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- (_state.visibleTill - _state.visibleFrom);
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const auto outsideBar = (_vertical ? _area.height() : _area.width())
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- (_vertical ? _bar.height() : _bar.width());
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return (outsideBar <= 0 || scrollable <= outsideBar)
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? change
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: (change * scrollable / outsideBar);
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}
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void ElasticScrollBar::mouseMoveEvent(QMouseEvent *e) {
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toggleOverBar(_bar.contains(e->pos()));
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if (_dragging && !_bar.isEmpty()) {
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const auto position = e->globalPos();
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const auto delta = position - _dragPosition;
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_dragPosition = position;
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if (auto change = scaleToBar(_vertical ? delta.y() : delta.x())) {
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if (base::OppositeSigns(_dragOverscrollAccumulated, change)) {
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const auto overscroll = (change < 0)
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? std::max(_dragOverscrollAccumulated + change, 0)
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: std::min(_dragOverscrollAccumulated + change, 0);
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const auto delta = overscroll - _dragOverscrollAccumulated;
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_dragOverscrollAccumulated = overscroll;
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change -= delta;
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}
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if (change) {
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const auto now = std::clamp(
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_state.visibleFrom + change,
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std::min(_state.visibleFrom, 0),
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std::max(
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_state.visibleFrom,
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(_state.visibleFrom
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+ (_state.fullSize - _state.visibleTill))));
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const auto delta = now - _state.visibleFrom;
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if (change != delta) {
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_dragOverscrollAccumulated
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= (base::OppositeSigns(
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_dragOverscrollAccumulated,
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change)
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? change
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: (_dragOverscrollAccumulated + change));
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}
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_visibleFromDragged.fire_copy(now);
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}
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}
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}
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}
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void ElasticScrollBar::mousePressEvent(QMouseEvent *e) {
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if (_bar.isEmpty()) {
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return;
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}
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toggleDragging(true);
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_dragPosition = e->globalPos();
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_dragOverscrollAccumulated = 0;
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if (!_overBar) {
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const auto start = _vertical ? _area.y() : _area.x();
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const auto full = _vertical ? _area.height() : _area.width();
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const auto bar = _vertical ? _bar.height() : _bar.width();
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const auto half = bar / 2;
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const auto middle = std::clamp(
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_vertical ? e->pos().y() : e->pos().x(),
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start + half,
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start + full + half - bar);
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const auto range = _state.visibleFrom
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+ (_state.fullSize - _state.visibleTill);
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const auto from = range * (middle - half - start) / (full - bar);
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_visibleFromDragged.fire_copy(from);
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}
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}
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void ElasticScrollBar::mouseReleaseEvent(QMouseEvent *e) {
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toggleDragging(false);
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if (!_over) {
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setMouseTracking(false);
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}
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}
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void ElasticScrollBar::resizeEvent(QResizeEvent *e) {
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refreshGeometry();
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}
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bool ElasticScrollBar::eventHook(QEvent *e) {
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setAttribute(Qt::WA_NoMousePropagation, e->type() != QEvent::Wheel);
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return RpWidget::eventHook(e);
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}
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ElasticScroll::ElasticScroll(
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QWidget *parent,
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const style::ScrollArea &st,
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Qt::Orientation orientation)
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: RpWidget(parent)
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, _st(st)
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, _bar(std::make_unique<ElasticScrollBar>(this, _st, orientation))
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, _touchTimer([=] { _touchRightButton = true; })
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, _touchScrollTimer([=] { touchScrollTimer(); })
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, _vertical(orientation == Qt::Vertical)
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, _position(Position{ 0, 0 })
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, _movement(Movement::None) {
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setAttribute(Qt::WA_AcceptTouchEvents);
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_bar->visibleFromDragged(
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) | rpl::start_with_next([=](int from) {
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tryScrollTo(from, false);
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}, _bar->lifetime());
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}
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void ElasticScroll::setHandleTouch(bool handle) {
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if (_touchDisabled != handle) {
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return;
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}
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_touchDisabled = !handle;
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constexpr auto attribute = Qt::WA_AcceptTouchEvents;
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setAttribute(attribute, handle);
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if (_widget) {
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if (handle) {
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_widgetAcceptsTouch = _widget->testAttribute(attribute);
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if (!_widgetAcceptsTouch) {
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_widget->setAttribute(attribute);
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}
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} else {
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if (!_widgetAcceptsTouch) {
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_widget->setAttribute(attribute, false);
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}
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}
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}
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}
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bool ElasticScroll::viewportEvent(QEvent *e) {
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const auto type = e->type();
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if (type == QEvent::Wheel) {
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return handleWheelEvent(static_cast<QWheelEvent*>(e));
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} else if (type == QEvent::TouchBegin
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|| type == QEvent::TouchUpdate
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|| type == QEvent::TouchEnd
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|| type == QEvent::TouchCancel) {
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handleTouchEvent(static_cast<QTouchEvent*>(e));
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return true;
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}
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return false;
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}
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void ElasticScroll::touchDeaccelerate(int32 elapsed) {
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int32 x = _touchSpeed.x();
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int32 y = _touchSpeed.y();
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_touchSpeed.setX((x == 0) ? x : (x > 0) ? qMax(0, x - elapsed) : qMin(0, x + elapsed));
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_touchSpeed.setY((y == 0) ? y : (y > 0) ? qMax(0, y - elapsed) : qMin(0, y + elapsed));
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}
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void ElasticScroll::overscrollReturn() {
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_overscrollReturning = true;
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_ignoreMomentumFromOverscroll = _overscroll;
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if (overscrollFinish()) {
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_overscrollReturnAnimation.stop();
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return;
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} else if (_overscrollReturnAnimation.animating()) {
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return;
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}
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_movement = Movement::Returning;
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_overscrollReturnAnimation.start(
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[=] { applyAccumulatedScroll(); },
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0.,
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1.,
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kOverscrollReturnDuration,
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anim::sineInOut);
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}
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auto ElasticScroll::computeAccumulatedParts() const ->AccumulatedParts {
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const auto baseAccumulated = currentOverscrollDefaultAccumulated();
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const auto returnProgress = _overscrollReturnAnimation.value(
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_overscrollReturning ? 1. : 0.);
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const auto relativeAccumulated = (1. - returnProgress)
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* (_overscrollAccumulated - baseAccumulated);
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return {
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.base = baseAccumulated,
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.relative = int(base::SafeRound(relativeAccumulated)),
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};
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}
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void ElasticScroll::overscrollReturnCancel() {
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_movement = Movement::Progress;
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if (_overscrollReturning) {
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const auto parts = computeAccumulatedParts();
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_overscrollAccumulated = parts.base + parts.relative;
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_overscrollReturnAnimation.stop();
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_overscrollReturning = false;
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applyAccumulatedScroll();
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}
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}
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int ElasticScroll::currentOverscrollDefault() const {
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return (_overscroll < 0)
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? _overscrollDefaultFrom
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: (_overscroll > 0)
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? _overscrollDefaultTill
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: 0;
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}
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int ElasticScroll::currentOverscrollDefaultAccumulated() const {
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return (_overscrollAccumulated < 0)
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? (_overscrollDefaultFrom ? kOverscrollFromThreshold : 0)
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: (_overscrollAccumulated > 0)
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? (_overscrollDefaultTill ? kOverscrollTillThreshold : 0)
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: 0;
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}
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void ElasticScroll::overscrollCheckReturnFinish() {
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if (!_overscrollReturning) {
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return;
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} else if (!_overscrollReturnAnimation.animating()) {
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_overscrollReturning = false;
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_overscrollAccumulated = currentOverscrollDefaultAccumulated();
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_movement = Movement::None;
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} else if (overscrollFinish()) {
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_overscrollReturnAnimation.stop();
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}
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}
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bool ElasticScroll::overscrollFinish() {
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if (_overscroll != currentOverscrollDefault()) {
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return false;
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}
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_overscrollReturning = false;
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_overscrollAccumulated = currentOverscrollDefaultAccumulated();
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_movement = Movement::None;
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return true;
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}
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void ElasticScroll::innerResized() {
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_innerResizes.fire({});
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}
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int ElasticScroll::scrollWidth() const {
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return (_vertical || !_widget)
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? width()
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: std::max(_widget->width(), width());
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}
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int ElasticScroll::scrollHeight() const {
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return (!_vertical || !_widget)
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? height()
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: std::max(_widget->height(), height());
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}
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int ElasticScroll::scrollLeftMax() const {
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return scrollWidth() - width();
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}
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|
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int ElasticScroll::scrollTopMax() const {
|
|
return scrollHeight() - height();
|
|
}
|
|
|
|
int ElasticScroll::scrollLeft() const {
|
|
return _vertical ? 0 : _state.visibleFrom;
|
|
}
|
|
|
|
int ElasticScroll::scrollTop() const {
|
|
return _vertical ? _state.visibleFrom : 0;
|
|
}
|
|
|
|
void ElasticScroll::touchScrollTimer() {
|
|
auto nowTime = crl::now();
|
|
if (_touchScrollState == TouchScrollState::Acceleration && _touchWaitingAcceleration && (nowTime - _touchAccelerationTime) > 40) {
|
|
_touchScrollState = TouchScrollState::Manual;
|
|
sendWheelEvent(Qt::ScrollEnd);
|
|
touchResetSpeed();
|
|
} else if (_touchScrollState == TouchScrollState::Auto || _touchScrollState == TouchScrollState::Acceleration) {
|
|
int32 elapsed = int32(nowTime - _touchTime);
|
|
QPoint delta = _touchSpeed * elapsed / 1000;
|
|
sendWheelEvent(
|
|
_touchPress ? Qt::ScrollUpdate : Qt::ScrollMomentum,
|
|
delta);
|
|
|
|
if (_touchSpeed.isNull()) {
|
|
_touchScrollState = TouchScrollState::Manual;
|
|
sendWheelEvent(Qt::ScrollEnd);
|
|
_touchScroll = false;
|
|
_touchScrollTimer.cancel();
|
|
} else {
|
|
_touchTime = nowTime;
|
|
}
|
|
touchDeaccelerate(elapsed);
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::touchUpdateSpeed() {
|
|
const auto nowTime = crl::now();
|
|
if (_touchPreviousPositionValid) {
|
|
const int elapsed = nowTime - _touchSpeedTime;
|
|
if (elapsed) {
|
|
const QPoint newPixelDiff = (_touchPosition - _touchPreviousPosition);
|
|
const QPoint pixelsPerSecond = newPixelDiff * (1000 / elapsed);
|
|
|
|
// fingers are inacurates, we ignore small changes to avoid stopping the autoscroll because
|
|
// of a small horizontal offset when scrolling vertically
|
|
const int newSpeedY = (qAbs(pixelsPerSecond.y()) > kFingerAccuracyThreshold) ? pixelsPerSecond.y() : 0;
|
|
const int newSpeedX = (qAbs(pixelsPerSecond.x()) > kFingerAccuracyThreshold) ? pixelsPerSecond.x() : 0;
|
|
if (_touchScrollState == TouchScrollState::Auto) {
|
|
const int oldSpeedY = _touchSpeed.y();
|
|
const int oldSpeedX = _touchSpeed.x();
|
|
if ((oldSpeedY <= 0 && newSpeedY <= 0) || ((oldSpeedY >= 0 && newSpeedY >= 0)
|
|
&& (oldSpeedX <= 0 && newSpeedX <= 0)) || (oldSpeedX >= 0 && newSpeedX >= 0)) {
|
|
_touchSpeed.setY(std::clamp((oldSpeedY + (newSpeedY / 4)), -kMaxScrollAccelerated, +kMaxScrollAccelerated));
|
|
_touchSpeed.setX(std::clamp((oldSpeedX + (newSpeedX / 4)), -kMaxScrollAccelerated, +kMaxScrollAccelerated));
|
|
} else {
|
|
_touchSpeed = QPoint();
|
|
}
|
|
} else {
|
|
// we average the speed to avoid strange effects with the last delta
|
|
if (!_touchSpeed.isNull()) {
|
|
_touchSpeed.setX(std::clamp((_touchSpeed.x() / 4) + (newSpeedX * 3 / 4), -kMaxScrollFlick, +kMaxScrollFlick));
|
|
_touchSpeed.setY(std::clamp((_touchSpeed.y() / 4) + (newSpeedY * 3 / 4), -kMaxScrollFlick, +kMaxScrollFlick));
|
|
} else {
|
|
_touchSpeed = QPoint(newSpeedX, newSpeedY);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
_touchPreviousPositionValid = true;
|
|
}
|
|
_touchSpeedTime = nowTime;
|
|
_touchPreviousPosition = _touchPosition;
|
|
}
|
|
|
|
void ElasticScroll::touchResetSpeed() {
|
|
_touchSpeed = QPoint();
|
|
_touchPreviousPositionValid = false;
|
|
}
|
|
|
|
bool ElasticScroll::eventHook(QEvent *e) {
|
|
return filterOutTouchEvent(e) || RpWidget::eventHook(e);
|
|
}
|
|
|
|
void ElasticScroll::wheelEvent(QWheelEvent *e) {
|
|
if (handleWheelEvent(e)) {
|
|
e->accept();
|
|
} else {
|
|
e->ignore();
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::paintEvent(QPaintEvent *e) {
|
|
if (!_overscrollBg) {
|
|
return;
|
|
}
|
|
const auto fillFrom = std::max(-_state.visibleFrom, 0);
|
|
const auto content = _widget
|
|
? (_vertical ? _widget->height() : _widget->width())
|
|
: 0;
|
|
const auto fillTill = content
|
|
? std::max(_state.visibleTill - content, 0)
|
|
: (_vertical ? height() : width());
|
|
if (!fillFrom && !fillTill) {
|
|
return;
|
|
}
|
|
auto p = QPainter(this);
|
|
if (fillFrom) {
|
|
p.fillRect(
|
|
0,
|
|
0,
|
|
_vertical ? width() : fillFrom,
|
|
_vertical ? fillFrom : height(),
|
|
*_overscrollBg);
|
|
}
|
|
if (fillTill) {
|
|
p.fillRect(
|
|
_vertical ? 0 : (width() - fillTill),
|
|
_vertical ? (height() - fillTill) : 0,
|
|
_vertical ? width() : fillTill,
|
|
_vertical ? fillTill : height(),
|
|
*_overscrollBg);
|
|
}
|
|
}
|
|
|
|
bool ElasticScroll::handleWheelEvent(not_null<QWheelEvent*> e, bool touch) {
|
|
if (_customWheelProcess
|
|
&& _customWheelProcess(static_cast<QWheelEvent*>(e.get()))) {
|
|
return true;
|
|
}
|
|
const auto phase = e->phase();
|
|
const auto momentum = (phase == Qt::ScrollMomentum)
|
|
|| (phase == Qt::ScrollEnd);
|
|
const auto now = crl::now();
|
|
const auto guard = gsl::finally([&] {
|
|
_lastScroll = now;
|
|
});
|
|
const auto pixels = ScrollDelta(e);
|
|
auto delta = _vertical ? -pixels.y() : pixels.x();
|
|
if (std::abs(_vertical ? pixels.x() : pixels.y()) >= std::abs(delta)) {
|
|
delta = 0;
|
|
}
|
|
if (_ignoreMomentumFromOverscroll) {
|
|
if (!momentum) {
|
|
_ignoreMomentumFromOverscroll = 0;
|
|
} else if (!_overscrollReturnAnimation.animating()
|
|
&& !base::OppositeSigns(_ignoreMomentumFromOverscroll, delta)) {
|
|
return true;
|
|
}
|
|
}
|
|
if (phase == Qt::NoScrollPhase) {
|
|
if (_overscroll == currentOverscrollDefault()) {
|
|
tryScrollTo(_state.visibleFrom + delta);
|
|
_movement = Movement::None;
|
|
} else if (!_overscrollReturnAnimation.animating()) {
|
|
overscrollReturn();
|
|
}
|
|
return true;
|
|
}
|
|
if (!momentum) {
|
|
overscrollReturnCancel();
|
|
} else if (_overscroll != currentOverscrollDefault()
|
|
&& !_overscrollReturnAnimation.animating()) {
|
|
overscrollReturn();
|
|
} else if (!_overscrollReturnAnimation.animating()) {
|
|
_movement = (phase == Qt::ScrollEnd)
|
|
? Movement::None
|
|
: Movement::Momentum;
|
|
}
|
|
if (!_overscroll) {
|
|
const auto normalTo = willScrollTo(_state.visibleFrom + delta);
|
|
delta -= normalTo - _state.visibleFrom;
|
|
applyScrollTo(normalTo);
|
|
}
|
|
if (!delta) {
|
|
return true;
|
|
}
|
|
if (touch) {
|
|
delta *= kTouchOverscrollMultiplier;
|
|
}
|
|
const auto accumulated = _overscrollAccumulated + delta;
|
|
const auto type = (accumulated < 0)
|
|
? _overscrollTypeFrom
|
|
: (accumulated > 0)
|
|
? _overscrollTypeTill
|
|
: OverscrollType::None;
|
|
if (type == OverscrollType::None
|
|
|| base::OppositeSigns(_overscrollAccumulated, accumulated)) {
|
|
_overscrollAccumulated = 0;
|
|
} else {
|
|
_overscrollAccumulated = accumulated;
|
|
}
|
|
applyAccumulatedScroll();
|
|
return true;
|
|
}
|
|
|
|
void ElasticScroll::applyAccumulatedScroll() {
|
|
overscrollCheckReturnFinish();
|
|
const auto parts = computeAccumulatedParts();
|
|
const auto baseOverscroll = (_overscrollAccumulated < 0)
|
|
? _overscrollDefaultFrom
|
|
: (_overscrollAccumulated > 0)
|
|
? _overscrollDefaultTill
|
|
: 0;
|
|
applyOverscroll(baseOverscroll
|
|
+ OverscrollFromAccumulated(parts.relative));
|
|
}
|
|
|
|
bool ElasticScroll::eventFilter(QObject *obj, QEvent *e) {
|
|
const auto result = RpWidget::eventFilter(obj, e);
|
|
if (obj == _widget.data()) {
|
|
if (filterOutTouchEvent(e)) {
|
|
return true;
|
|
} else if (e->type() == QEvent::Resize) {
|
|
const auto weak = Ui::MakeWeak(this);
|
|
updateState();
|
|
if (weak) {
|
|
_innerResizes.fire({});
|
|
}
|
|
} else if (e->type() == QEvent::Move) {
|
|
updateState();
|
|
}
|
|
return result;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool ElasticScroll::filterOutTouchEvent(QEvent *e) {
|
|
const auto type = e->type();
|
|
if (type == QEvent::TouchBegin
|
|
|| type == QEvent::TouchUpdate
|
|
|| type == QEvent::TouchEnd
|
|
|| type == QEvent::TouchCancel) {
|
|
const auto ev = static_cast<QTouchEvent*>(e);
|
|
if (ev->device()->type() == base::TouchDevice::TouchScreen) {
|
|
if (_customTouchProcess && _customTouchProcess(ev)) {
|
|
return true;
|
|
} else if (!_touchDisabled) {
|
|
handleTouchEvent(ev);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void ElasticScroll::handleTouchEvent(QTouchEvent *e) {
|
|
if (!e->touchPoints().isEmpty()) {
|
|
_touchPreviousPosition = _touchPosition;
|
|
_touchPosition = e->touchPoints().cbegin()->screenPos().toPoint();
|
|
}
|
|
|
|
switch (e->type()) {
|
|
case QEvent::TouchBegin: {
|
|
if (_touchPress || e->touchPoints().isEmpty()) {
|
|
return;
|
|
}
|
|
_touchPress = true;
|
|
if (_touchScrollState == TouchScrollState::Auto) {
|
|
_touchScrollState = TouchScrollState::Acceleration;
|
|
_touchWaitingAcceleration = true;
|
|
_touchAccelerationTime = crl::now();
|
|
touchUpdateSpeed();
|
|
_touchStart = _touchPosition;
|
|
} else {
|
|
_touchScroll = false;
|
|
_touchTimer.callOnce(QApplication::startDragTime());
|
|
}
|
|
_touchStart = _touchPreviousPosition = _touchPosition;
|
|
_touchRightButton = false;
|
|
sendWheelEvent(Qt::ScrollBegin);
|
|
} break;
|
|
|
|
case QEvent::TouchUpdate: {
|
|
if (!_touchPress) {
|
|
return;
|
|
}
|
|
if (!_touchScroll
|
|
&& ((_touchPosition - _touchStart).manhattanLength()
|
|
>= QApplication::startDragDistance())) {
|
|
_touchTimer.cancel();
|
|
_touchScroll = true;
|
|
touchUpdateSpeed();
|
|
}
|
|
if (_touchScroll) {
|
|
if (_touchScrollState == TouchScrollState::Manual) {
|
|
touchScrollUpdated();
|
|
} else if (_touchScrollState == TouchScrollState::Acceleration) {
|
|
touchUpdateSpeed();
|
|
_touchAccelerationTime = crl::now();
|
|
if (_touchSpeed.isNull()) {
|
|
_touchScrollState = TouchScrollState::Manual;
|
|
}
|
|
}
|
|
}
|
|
} break;
|
|
|
|
case QEvent::TouchEnd: {
|
|
if (!_touchPress) {
|
|
return;
|
|
}
|
|
_touchPress = false;
|
|
auto weak = MakeWeak(this);
|
|
if (_touchScroll) {
|
|
if (_touchScrollState == TouchScrollState::Manual) {
|
|
_touchScrollState = TouchScrollState::Auto;
|
|
_touchPreviousPositionValid = false;
|
|
_touchScrollTimer.callEach(15);
|
|
_touchTime = crl::now();
|
|
} else if (_touchScrollState == TouchScrollState::Auto) {
|
|
_touchScrollState = TouchScrollState::Manual;
|
|
_touchScroll = false;
|
|
touchResetSpeed();
|
|
} else if (_touchScrollState == TouchScrollState::Acceleration) {
|
|
_touchScrollState = TouchScrollState::Auto;
|
|
_touchWaitingAcceleration = false;
|
|
_touchPreviousPositionValid = false;
|
|
}
|
|
} else if (window()) { // one short tap -- like left mouse click, one long tap -- like right mouse click
|
|
Qt::MouseButton btn(_touchRightButton ? Qt::RightButton : Qt::LeftButton);
|
|
|
|
if (weak) SendSynteticMouseEvent(this, QEvent::MouseMove, Qt::NoButton, _touchStart);
|
|
if (weak) SendSynteticMouseEvent(this, QEvent::MouseButtonPress, btn, _touchStart);
|
|
if (weak) SendSynteticMouseEvent(this, QEvent::MouseButtonRelease, btn, _touchStart);
|
|
|
|
if (weak && _touchRightButton) {
|
|
auto windowHandle = window()->windowHandle();
|
|
auto localPoint = windowHandle->mapFromGlobal(_touchStart);
|
|
QContextMenuEvent ev(QContextMenuEvent::Mouse, localPoint, _touchStart, QGuiApplication::keyboardModifiers());
|
|
ev.setTimestamp(crl::now());
|
|
QGuiApplication::sendEvent(windowHandle, &ev);
|
|
}
|
|
}
|
|
if (weak) {
|
|
_touchTimer.cancel();
|
|
_touchRightButton = false;
|
|
}
|
|
} break;
|
|
|
|
case QEvent::TouchCancel: {
|
|
_touchPress = false;
|
|
_touchScroll = false;
|
|
_touchScrollState = TouchScrollState::Manual;
|
|
_touchTimer.cancel();
|
|
} break;
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::touchScrollUpdated() {
|
|
//touchScroll(_touchPosition - _touchPreviousPosition);
|
|
const auto phase = !_touchPress
|
|
? Qt::ScrollMomentum
|
|
: Qt::ScrollUpdate;
|
|
sendWheelEvent(phase, _touchPosition - _touchPreviousPosition);
|
|
touchUpdateSpeed();
|
|
}
|
|
|
|
void ElasticScroll::disableScroll(bool dis) {
|
|
_disabled = dis;
|
|
if (_disabled && _st.hiding) {
|
|
_bar->toggle(false);
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::updateState() {
|
|
_dirtyState = false;
|
|
if (!_widget) {
|
|
setState({});
|
|
return;
|
|
}
|
|
auto from = _vertical ? -_widget->y() : -_widget->x();
|
|
auto till = from + (_vertical ? height() : width());
|
|
const auto wasFullSize = _state.fullSize;
|
|
const auto nowFullSize = _vertical ? scrollHeight() : scrollWidth();
|
|
if (wasFullSize > nowFullSize) {
|
|
const auto wasOverscroll = std::max(
|
|
_state.visibleTill - wasFullSize,
|
|
0);
|
|
const auto nowOverscroll = std::max(till - nowFullSize, 0);
|
|
const auto delta = std::max(
|
|
std::min(nowOverscroll - wasOverscroll, from),
|
|
0);
|
|
if (delta) {
|
|
applyScrollTo(from - delta);
|
|
return;
|
|
}
|
|
}
|
|
setState({
|
|
.visibleFrom = from,
|
|
.visibleTill = till,
|
|
.fullSize = nowFullSize,
|
|
});
|
|
}
|
|
|
|
void ElasticScroll::setState(ScrollState state) {
|
|
if (_overscroll < 0
|
|
&& (state.visibleFrom > 0
|
|
|| (!state.visibleFrom
|
|
&& _overscrollTypeFrom == OverscrollType::Real))) {
|
|
_overscroll = _overscrollDefaultFrom = 0;
|
|
overscrollFinish();
|
|
_overscrollReturnAnimation.stop();
|
|
} else if (_overscroll > 0
|
|
&& (state.visibleTill < state.fullSize
|
|
|| (state.visibleTill == state.fullSize
|
|
&& _overscrollTypeTill == OverscrollType::Real))) {
|
|
_overscroll = _overscrollDefaultTill = 0;
|
|
overscrollFinish();
|
|
_overscrollReturnAnimation.stop();
|
|
}
|
|
if (_state == state) {
|
|
_position = Position{ _state.visibleFrom, _overscroll };
|
|
return;
|
|
}
|
|
const auto weak = Ui::MakeWeak(this);
|
|
const auto old = _state.visibleFrom;
|
|
_state = state;
|
|
_bar->updateState(state);
|
|
if (weak) {
|
|
_position = Position{ _state.visibleFrom, _overscroll };
|
|
}
|
|
if (weak && _state.visibleFrom != old) {
|
|
if (_vertical) {
|
|
_scrollTopUpdated.fire_copy(_state.visibleFrom);
|
|
}
|
|
if (weak) {
|
|
_scrolls.fire({});
|
|
}
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::applyScrollTo(int position, bool synthMouseMove) {
|
|
if (_disabled) {
|
|
return;
|
|
}
|
|
const auto weak = Ui::MakeWeak(this);
|
|
_dirtyState = true;
|
|
const auto was = _widget->geometry();
|
|
_widget->move(
|
|
_vertical ? _widget->x() : -position,
|
|
_vertical ? -position : _widget->y());
|
|
if (weak) {
|
|
const auto now = _widget->geometry();
|
|
const auto wasFrom = _vertical ? was.y() : was.x();
|
|
const auto wasTill = wasFrom
|
|
+ (_vertical ? was.height() : was.width());
|
|
const auto nowFrom = _vertical ? now.y() : now.x();
|
|
const auto nowTill = nowFrom
|
|
+ (_vertical ? now.height() : now.width());
|
|
const auto mySize = _vertical ? height() : width();
|
|
if ((wasFrom > 0 && wasFrom < mySize)
|
|
|| (wasTill > 0 && wasTill < mySize)
|
|
|| (nowFrom > 0 && nowFrom < mySize)
|
|
|| (nowTill > 0 && nowTill < mySize)) {
|
|
update();
|
|
}
|
|
if (_dirtyState) {
|
|
updateState();
|
|
}
|
|
if (weak && synthMouseMove) {
|
|
SendSynteticMouseEvent(this, QEvent::MouseMove, Qt::NoButton);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::applyOverscroll(int overscroll) {
|
|
if (_overscroll == overscroll) {
|
|
return;
|
|
}
|
|
_overscroll = overscroll;
|
|
const auto max = _state.fullSize
|
|
- (_state.visibleTill - _state.visibleFrom);
|
|
if (_overscroll > 0) {
|
|
const auto added = (_overscrollTypeTill == OverscrollType::Real)
|
|
? _overscroll
|
|
: 0;
|
|
applyScrollTo(max + added);
|
|
} else if (_overscroll < 0) {
|
|
applyScrollTo((_overscrollTypeFrom == OverscrollType::Real)
|
|
? _overscroll
|
|
: 0);
|
|
} else {
|
|
applyScrollTo(std::clamp(_state.visibleFrom, 0, max));
|
|
}
|
|
}
|
|
|
|
int ElasticScroll::willScrollTo(int position) const {
|
|
return std::clamp(
|
|
position,
|
|
std::min(_state.visibleFrom, 0),
|
|
std::max(
|
|
_state.visibleFrom,
|
|
(_state.visibleFrom
|
|
+ (_state.fullSize - _state.visibleTill))));
|
|
}
|
|
|
|
void ElasticScroll::tryScrollTo(int position, bool synthMouseMove) {
|
|
applyScrollTo(willScrollTo(position), synthMouseMove);
|
|
}
|
|
|
|
void ElasticScroll::sendWheelEvent(Qt::ScrollPhase phase, QPoint delta) {
|
|
auto e = QWheelEvent(
|
|
mapFromGlobal(_touchPosition),
|
|
_touchPosition,
|
|
delta,
|
|
delta,
|
|
Qt::NoButton,
|
|
QGuiApplication::keyboardModifiers(),
|
|
phase,
|
|
false,
|
|
Qt::MouseEventSynthesizedByApplication);
|
|
handleWheelEvent(&e, true);
|
|
}
|
|
|
|
void ElasticScroll::resizeEvent(QResizeEvent *e) {
|
|
const auto rtl = (layoutDirection() == Qt::RightToLeft);
|
|
_bar->setGeometry(_vertical
|
|
? QRect(
|
|
(rtl ? 0 : (width() - _st.width)),
|
|
0,
|
|
_st.width,
|
|
height())
|
|
: QRect(0, height() - _st.width, width(), _st.width));
|
|
_geometryChanged.fire({});
|
|
updateState();
|
|
}
|
|
|
|
void ElasticScroll::moveEvent(QMoveEvent *e) {
|
|
_geometryChanged.fire({});
|
|
}
|
|
|
|
void ElasticScroll::keyPressEvent(QKeyEvent *e) {
|
|
if ((e->key() == Qt::Key_Up || e->key() == Qt::Key_Down)
|
|
&& e->modifiers().testFlag(Qt::AltModifier)) {
|
|
e->ignore();
|
|
} else if (_widget && (e->key() == Qt::Key_Escape || e->key() == Qt::Key_Back)) {
|
|
((QObject*)_widget.data())->event(e);
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::enterEventHook(QEnterEvent *e) {
|
|
if (!_disabled) {
|
|
_bar->toggle(true);
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::leaveEventHook(QEvent *e) {
|
|
_bar->toggle(false);
|
|
}
|
|
|
|
void ElasticScroll::scrollTo(ScrollToRequest request) {
|
|
scrollToY(request.ymin, request.ymax);
|
|
}
|
|
|
|
void ElasticScroll::scrollToWidget(not_null<QWidget*> widget) {
|
|
if (const auto local = _widget.data()) {
|
|
const auto position = Ui::MapFrom(
|
|
local,
|
|
widget.get(),
|
|
QPoint(0, 0));
|
|
const auto from = _vertical ? position.y() : position.x();
|
|
const auto till = _vertical
|
|
? (position.y() + widget->height())
|
|
: (position.x() + widget->width());
|
|
scrollToY(from, till);
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::scrollToY(int toTop, int toBottom) {
|
|
if (_vertical) {
|
|
scrollTo(toTop, toBottom);
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::scrollTo(int toFrom, int toTill) {
|
|
if (const auto inner = _widget.data()) {
|
|
SendPendingMoveResizeEvents(inner);
|
|
}
|
|
SendPendingMoveResizeEvents(this);
|
|
|
|
int toMin = std::min(_state.visibleFrom, 0);
|
|
int toMax = std::max(
|
|
_state.visibleFrom,
|
|
_state.visibleFrom + _state.fullSize - _state.visibleTill);
|
|
if (toFrom < toMin) {
|
|
toFrom = toMin;
|
|
} else if (toFrom > toMax) {
|
|
toFrom = toMax;
|
|
}
|
|
bool exact = (toTill < 0);
|
|
|
|
int curFrom = _state.visibleFrom, curRange = _state.visibleTill - _state.visibleFrom, curTill = curFrom + curRange, scTo = toFrom;
|
|
if (!exact && toFrom >= curFrom) {
|
|
if (toTill < toFrom) toTill = toFrom;
|
|
if (toTill <= curTill) return;
|
|
|
|
scTo = toTill - curRange;
|
|
if (scTo > toFrom) scTo = toFrom;
|
|
if (scTo == curFrom) return;
|
|
} else {
|
|
scTo = toFrom;
|
|
}
|
|
applyScrollTo(scTo);
|
|
}
|
|
|
|
void ElasticScroll::doSetOwnedWidget(object_ptr<QWidget> w) {
|
|
constexpr auto attribute = Qt::WA_AcceptTouchEvents;
|
|
if (_widget) {
|
|
_widget->removeEventFilter(this);
|
|
if (!_touchDisabled && !_widgetAcceptsTouch) {
|
|
_widget->setAttribute(attribute, false);
|
|
}
|
|
}
|
|
_widget = std::move(w);
|
|
if (_widget) {
|
|
if (_widget->parentWidget() != this) {
|
|
_widget->setParent(this);
|
|
_widget->show();
|
|
}
|
|
_bar->raise();
|
|
_widget->installEventFilter(this);
|
|
if (!_touchDisabled) {
|
|
_widgetAcceptsTouch = _widget->testAttribute(attribute);
|
|
if (!_widgetAcceptsTouch) {
|
|
_widget->setAttribute(attribute);
|
|
}
|
|
}
|
|
updateState();
|
|
}
|
|
}
|
|
|
|
object_ptr<QWidget> ElasticScroll::doTakeWidget() {
|
|
return std::move(_widget);
|
|
}
|
|
|
|
void ElasticScroll::updateBars() {
|
|
_bar->update();
|
|
}
|
|
|
|
void ElasticScroll::setOverscrollTypes(
|
|
OverscrollType from,
|
|
OverscrollType till) {
|
|
const auto fromChanged = (_overscroll < 0)
|
|
&& (_overscrollTypeFrom != from);
|
|
const auto tillChanged = (_overscroll > 0)
|
|
&& (_overscrollTypeTill != till);
|
|
_overscrollTypeFrom = from;
|
|
_overscrollTypeTill = till;
|
|
if (fromChanged) {
|
|
switch (_overscrollTypeFrom) {
|
|
case OverscrollType::None:
|
|
_overscroll = _overscrollAccumulated = 0;
|
|
applyScrollTo(0);
|
|
break;
|
|
case OverscrollType::Virtual:
|
|
applyScrollTo(0);
|
|
break;
|
|
case OverscrollType::Real:
|
|
applyScrollTo(_overscroll);
|
|
break;
|
|
}
|
|
} else if (tillChanged) {
|
|
const auto max = _state.fullSize
|
|
- (_state.visibleTill - _state.visibleFrom);
|
|
switch (_overscrollTypeTill) {
|
|
case OverscrollType::None:
|
|
_overscroll = _overscrollAccumulated = 0;
|
|
applyScrollTo(max);
|
|
break;
|
|
case OverscrollType::Virtual:
|
|
applyScrollTo(max);
|
|
break;
|
|
case OverscrollType::Real:
|
|
applyScrollTo(max + _overscroll);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::setOverscrollDefaults(int from, int till, bool shift) {
|
|
Expects(from <= 0 && till >= 0);
|
|
|
|
if (_state.visibleFrom > 0
|
|
|| (!_state.visibleFrom
|
|
&& _overscrollTypeFrom != OverscrollType::Virtual)) {
|
|
from = 0;
|
|
}
|
|
if (_state.visibleTill < _state.fullSize
|
|
|| (_state.visibleTill == _state.fullSize
|
|
&& _overscrollTypeTill != OverscrollType::Virtual)) {
|
|
till = 0;
|
|
}
|
|
const auto fromChanged = (_overscrollDefaultFrom != from);
|
|
const auto tillChanged = (_overscrollDefaultTill != till);
|
|
const auto changed = (fromChanged && _overscroll < 0)
|
|
|| (tillChanged && _overscroll > 0);
|
|
const auto movement = _movement.current();
|
|
if (_overscrollReturnAnimation.animating()) {
|
|
overscrollReturnCancel();
|
|
}
|
|
_overscrollDefaultFrom = from;
|
|
_overscrollDefaultTill = till;
|
|
if (changed) {
|
|
const auto delta = (_overscroll < 0)
|
|
? (_overscroll - (shift ? 0 : _overscrollDefaultFrom))
|
|
: (_overscroll - (shift ? 0 : _overscrollDefaultTill));
|
|
_overscrollAccumulated = currentOverscrollDefaultAccumulated()
|
|
+ OverscrollToAccumulated(delta);
|
|
}
|
|
if (movement == Movement::Momentum || movement == Movement::Returning) {
|
|
if (_overscroll != currentOverscrollDefault()) {
|
|
overscrollReturn();
|
|
}
|
|
}
|
|
}
|
|
|
|
void ElasticScroll::setOverscrollBg(QColor bg) {
|
|
_overscrollBg = bg;
|
|
update();
|
|
}
|
|
|
|
rpl::producer<> ElasticScroll::scrolls() const {
|
|
return _scrolls.events();
|
|
}
|
|
|
|
rpl::producer<> ElasticScroll::innerResizes() const {
|
|
return _innerResizes.events();
|
|
}
|
|
|
|
rpl::producer<> ElasticScroll::geometryChanged() const {
|
|
return _geometryChanged.events();
|
|
}
|
|
|
|
ElasticScrollPosition ElasticScroll::position() const {
|
|
return _position.current();
|
|
}
|
|
|
|
rpl::producer<ElasticScrollPosition> ElasticScroll::positionValue() const {
|
|
return _position.value();
|
|
}
|
|
|
|
ElasticScrollMovement ElasticScroll::movement() const {
|
|
return _movement.current();
|
|
}
|
|
|
|
rpl::producer<ElasticScrollMovement> ElasticScroll::movementValue() const {
|
|
return _movement.value();
|
|
}
|
|
|
|
QPoint ScrollDelta(not_null<QWheelEvent*> e) {
|
|
const auto convert = [](QPoint point) {
|
|
return QPoint(
|
|
style::ConvertScale(point.x()),
|
|
style::ConvertScale(point.y()));
|
|
};
|
|
if (Platform::IsMac()
|
|
|| (Platform::IsWindows() && e->phase() != Qt::NoScrollPhase)) {
|
|
return convert(e->pixelDelta());
|
|
}
|
|
return convert(e->angleDelta() * style::DevicePixelRatio());
|
|
}
|
|
|
|
} // namespace Ui
|