605 lines
19 KiB
C++
605 lines
19 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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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014 John Preston, https://desktop.telegram.org
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*/
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#include "stdafx.h"
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#include "style.h"
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#include "gui/scrollarea.h"
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// flick scroll taken from http://qt-project.org/doc/qt-4.8/demos-embedded-anomaly-src-flickcharm-cpp.html
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ScrollShadow::ScrollShadow(ScrollArea *parent, const style::flatScroll *st) : QWidget(parent), _st(st) {
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setVisible(false);
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}
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void ScrollShadow::paintEvent(QPaintEvent *e) {
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QPainter p(this);
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p.fillRect(rect(), _st->shColor->b);
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}
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void ScrollShadow::changeVisibility(bool shown) {
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setVisible(shown);
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}
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ScrollBar::ScrollBar(ScrollArea *parent, bool vert, const style::flatScroll *st) : QWidget(parent),
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_area(parent), _st(st), _vertical(vert),
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_over(false), _overbar(false), _moving(false), _topSh(false), _bottomSh(false),
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_connected(vert ? parent->verticalScrollBar() : parent->horizontalScrollBar()),
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_scrollMax(_connected->maximum()), _hideIn(-1),
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a_bg((_st->hiding ? st::transparent : _st->bgColor)->c),
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a_bar((_st->hiding ? st::transparent : _st->barColor)->c) {
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recountSize();
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_hideTimer.setSingleShot(true);
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connect(&_hideTimer, SIGNAL(timeout()), this, SLOT(onHideTimer()));
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connect(_connected, SIGNAL(valueChanged(int)), this, SLOT(updateBar()));
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connect(_connected, SIGNAL(rangeChanged(int, int)), this, SLOT(updateBar()));
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updateBar();
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}
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void ScrollBar::recountSize() {
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setGeometry(_vertical ? QRect(_area->width() - _st->width, 0, _st->width, _area->height()) : QRect(0, _area->height() - _st->width, _area->width(), _st->width));
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}
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void ScrollBar::updateBar() {
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QRect newBar;
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if (_connected->maximum() != _scrollMax) {
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int32 oldMax = _scrollMax, newMax = _connected->maximum();
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_scrollMax = newMax;
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_area->rangeChanged(oldMax, newMax, _vertical);
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}
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if (_vertical) {
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int sh = _area->scrollHeight(), rh = height() - 2 * _st->deltay, h = sh ? int32((rh * int64(_area->height())) / sh) : 0;
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if (h >= rh || !_area->scrollTopMax() || rh < _st->minHeight) {
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if (!isHidden()) hide();
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if (_topSh) emit topShadowVisibility(_topSh = (_st->topsh < 0));
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if (_bottomSh) emit bottomShadowVisibility(_bottomSh = (_st->bottomsh < 0));
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return;
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}
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if (h <= _st->minHeight) h = _st->minHeight;
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int stm = _area->scrollTopMax(), y = stm ? int32(((rh - h) * int64(_area->scrollTop())) / stm) : 0;
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if (y > rh - h) y = rh - h;
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newBar = QRect(_st->deltax, y + _st->deltay, width() - 2 * _st->deltax, h);
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} else {
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int sw = _area->scrollWidth(), rw = width() - 2 * _st->deltay, w = sw ? int32((rw * int64(_area->width())) / sw) : 0;
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if (w >= rw || !_area->scrollLeftMax() || rw < _st->minHeight) {
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if (!isHidden()) hide();
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return;
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}
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if (w <= _st->minHeight) w = _st->minHeight;
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int slm = _area->scrollLeftMax(), x = slm ? int32(((rw - w) * int64(_area->scrollLeft())) / slm) : 0;
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if (x > rw - w) x = rw - w;
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newBar = QRect(x + _st->deltay, _st->deltax, w, height() - 2 * _st->deltax);
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}
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if (newBar != _bar) {
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_bar = newBar;
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update();
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}
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if (_vertical) {
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bool newTopSh = (_st->topsh < 0) || (_area->scrollTop() > _st->topsh), newBottomSh = (_st->bottomsh < 0) || (_area->scrollTop() < _area->scrollTopMax() - _st->bottomsh);
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if (newTopSh != _topSh) emit topShadowVisibility(_topSh = newTopSh);
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if (newBottomSh != _bottomSh) emit bottomShadowVisibility(_bottomSh = newBottomSh);
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}
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if (isHidden()) show();
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}
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void ScrollBar::onHideTimer() {
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_hideIn = -1;
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a_bg.start(st::transparent->c);
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a_bar.start(st::transparent->c);
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anim::start(this);
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}
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void ScrollBar::paintEvent(QPaintEvent *e) {
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if (!_bar.width() && !_bar.height()) {
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hide();
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return;
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}
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if (!a_bg.current().alpha() && !a_bar.current().alpha()) return;
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QPainter p(this);
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int32 deltax = _vertical ? _st->deltax : _st->deltay, deltay = _vertical ? _st->deltay : _st->deltax;
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p.setPen(Qt::NoPen);
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if (_st->round) {
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p.setBrush(a_bg.current());
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p.drawRoundedRect(QRect(deltax, deltay, width() - 2 * deltax, height() - 2 * deltay), _st->round, _st->round);
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p.setBrush(a_bar.current());
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p.drawRoundedRect(_bar, _st->round, _st->round);
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} else {
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p.fillRect(QRect(deltax, deltay, width() - 2 * deltax, height() - 2 * deltay), a_bg.current());
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p.fillRect(_bar, a_bar.current());
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}
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}
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bool ScrollBar::animStep(float64 ms) {
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float64 dt = ms / _st->duration;
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bool res = true;
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if (dt >= 1) {
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a_bg.finish();
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a_bar.finish();
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res = false;
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} else {
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a_bg.update(dt, anim::linear);
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a_bar.update(dt, anim::linear);
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}
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update();
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return res;
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}
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void ScrollBar::hideTimeout(int64 dt) {
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if (_hideIn < 0) {
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a_bg.start((_over ? _st->bgOverColor : _st->bgColor)->c);
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a_bar.start((_overbar ? _st->barOverColor : _st->barColor)->c);
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anim::start(this);
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}
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_hideIn = dt;
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if (!_moving && _hideIn >= 0) {
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_hideTimer.start(_hideIn);
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}
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}
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void ScrollBar::enterEvent(QEvent *e) {
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_hideTimer.stop();
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setMouseTracking(true);
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_over = true;
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a_bg.start(_st->bgOverColor->c);
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a_bar.start(_st->barColor->c);
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anim::start(this);
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}
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void ScrollBar::leaveEvent(QEvent *e) {
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if (!_moving) {
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setMouseTracking(false);
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a_bg.start(_st->bgColor->c);
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a_bar.start(_st->barColor->c);
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anim::start(this);
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if (_hideIn >= 0) {
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_hideTimer.start(_hideIn);
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}
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}
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_over = _overbar = false;
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}
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void ScrollBar::mouseMoveEvent(QMouseEvent *e) {
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bool newOverBar = _bar.contains(e->pos());
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if (_overbar != newOverBar) {
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_overbar = newOverBar;
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if (!_moving) {
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a_bar.start((newOverBar ? _st->barOverColor : _st->barColor)->c);
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a_bg.start(_st->bgOverColor->c);
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anim::start(this);
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}
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}
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if (_moving) {
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int delta = 0, barDelta = _vertical ? (_area->height() - _bar.height()) : (_area->width() - _bar.width());
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if (barDelta) {
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QPoint d = (e->globalPos() - _dragStart);
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delta = int32((_vertical ? (d.y() * int64(_area->scrollTopMax())) : (d.x() * int64(_area->scrollLeftMax()))) / barDelta);
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}
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_connected->setValue(_startFrom + delta);
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}
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}
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void ScrollBar::mousePressEvent(QMouseEvent *e) {
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if (!width() || !height()) return;
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_dragStart = e->globalPos();
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_moving = true;
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if (_overbar) {
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_startFrom = _connected->value();
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} else {
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_startFrom = _vertical ? int32((e->pos().y() * int64(_area->scrollTopMax())) / height()) : ((e->pos().x() * int64(_area->scrollLeftMax())) / width());
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_connected->setValue(_startFrom);
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if (!_overbar) {
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_overbar = true;
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a_bar.start(_st->barOverColor->c);
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a_bg.start(_st->bgOverColor->c);
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anim::start(this);
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}
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}
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emit _area->scrollStarted();
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}
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void ScrollBar::mouseReleaseEvent(QMouseEvent *e) {
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if (_moving) {
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_moving = false;
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bool a = false;
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if (!_overbar) {
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if (!_over || _hideIn) {
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a_bar.start(_st->barColor->c);
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a = true;
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}
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}
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if (!_over) {
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if (_hideIn) {
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a_bg.start(_st->bgColor->c);
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a = true;
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}
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if (_hideIn >= 0) {
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_hideTimer.start(_hideIn);
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}
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}
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if (a) anim::start(this);
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emit _area->scrollFinished();
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}
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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 ScrollBar::resizeEvent(QResizeEvent *e) {
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updateBar();
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}
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ScrollArea::ScrollArea(QWidget *parent, const style::flatScroll &st, bool handleTouch) : QScrollArea(parent),
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_st(st),
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hor(this, false, &_st), vert(this, true, &_st), topSh(this, &_st), bottomSh(this, &_st),
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_touchEnabled(handleTouch), _touchScroll(false), _touchPress(false), _touchRightButton(false),
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_touchScrollState(TouchScrollManual), _touchPrevPosValid(false), _touchWaitingAcceleration(false),
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_touchSpeedTime(0), _touchAccelerationTime(0), _touchTime(0), _widgetAcceptsTouch(false) {
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connect(horizontalScrollBar(), SIGNAL(valueChanged(int)), this, SIGNAL(scrolled()));
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connect(verticalScrollBar(), SIGNAL(valueChanged(int)), this, SIGNAL(scrolled()));
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connect(&vert, SIGNAL(topShadowVisibility(bool)), &topSh, SLOT(changeVisibility(bool)));
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connect(&vert, SIGNAL(bottomShadowVisibility(bool)), &bottomSh, SLOT(changeVisibility(bool)));
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if (_st.hiding) {
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connect(this, SIGNAL(scrolled()), this, SLOT(onScrolled()));
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}
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setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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setFrameStyle(QFrame::NoFrame | QFrame::Plain);
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viewport()->setAutoFillBackground(false);
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_horValue = horizontalScrollBar()->value();
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_vertValue = verticalScrollBar()->value();
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if (_touchEnabled) {
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viewport()->setAttribute(Qt::WA_AcceptTouchEvents);
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_touchTimer.setSingleShot(true);
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connect(&_touchTimer, SIGNAL(timeout()), this, SLOT(onTouchTimer()));
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connect(&_touchScrollTimer, SIGNAL(timeout()), this, SLOT(onTouchScrollTimer()));
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}
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}
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void ScrollArea::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 ScrollArea::onScrolled() {
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int32 horValue = horizontalScrollBar()->value(), vertValue = verticalScrollBar()->value();
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if (_horValue != horValue) {
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_horValue = horValue;
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if (_st.hiding) {
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hor.hideTimeout(_st.hiding);
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}
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}
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if (_vertValue != vertValue) {
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_vertValue = vertValue;
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if (_st.hiding) {
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vert.hideTimeout(_st.hiding);
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}
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}
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}
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int ScrollArea::scrollWidth() const {
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return scrollLeftMax() + width();
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}
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int ScrollArea::scrollHeight() const {
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return scrollTopMax() + height();
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}
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int ScrollArea::scrollLeftMax() const {
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return horizontalScrollBar()->maximum();
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}
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int ScrollArea::scrollTopMax() const {
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return verticalScrollBar()->maximum();
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}
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int ScrollArea::scrollLeft() const {
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return horizontalScrollBar()->value();
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}
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int ScrollArea::scrollTop() const {
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return verticalScrollBar()->value();
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}
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void ScrollArea::onTouchTimer() {
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_touchRightButton = true;
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}
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void ScrollArea::onTouchScrollTimer() {
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uint64 nowTime = getms();
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if (_touchScrollState == TouchScrollAcceleration && _touchWaitingAcceleration && (nowTime - _touchAccelerationTime) > 40) {
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_touchScrollState = TouchScrollManual;
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touchResetSpeed();
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} else if (_touchScrollState == TouchScrollAuto || _touchScrollState == TouchScrollAcceleration) {
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int32 elapsed = int32(nowTime - _touchTime);
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QPoint delta = _touchSpeed * elapsed / 1000;
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bool hasScrolled = touchScroll(delta);
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if (_touchSpeed.isNull() || !hasScrolled) {
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_touchScrollState = TouchScrollManual;
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_touchScroll = false;
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_touchScrollTimer.stop();
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} else {
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_touchTime = nowTime;
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}
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touchDeaccelerate(elapsed);
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}
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}
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void ScrollArea::touchUpdateSpeed() {
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const uint64 nowTime = getms();
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if (_touchPrevPosValid) {
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const int elapsed = nowTime - _touchSpeedTime;
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if (elapsed) {
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const QPoint newPixelDiff = (_touchPos - _touchPrevPos);
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const QPoint pixelsPerSecond = newPixelDiff * (1000 / elapsed);
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// fingers are inacurates, we ignore small changes to avoid stopping the autoscroll because
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// of a small horizontal offset when scrolling vertically
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const int newSpeedY = (qAbs(pixelsPerSecond.y()) > FingerAccuracyThreshold) ? pixelsPerSecond.y() : 0;
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const int newSpeedX = (qAbs(pixelsPerSecond.x()) > FingerAccuracyThreshold) ? pixelsPerSecond.x() : 0;
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if (_touchScrollState == TouchScrollAuto) {
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const int oldSpeedY = _touchSpeed.y();
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const int oldSpeedX = _touchSpeed.x();
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if ((oldSpeedY <= 0 && newSpeedY <= 0) || ((oldSpeedY >= 0 && newSpeedY >= 0)
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&& (oldSpeedX <= 0 && newSpeedX <= 0)) || (oldSpeedX >= 0 && newSpeedX >= 0)) {
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_touchSpeed.setY(snap((oldSpeedY + (newSpeedY / 4)), -MaxScrollAccelerated, +MaxScrollAccelerated));
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_touchSpeed.setX(snap((oldSpeedX + (newSpeedX / 4)), -MaxScrollAccelerated, +MaxScrollAccelerated));
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} else {
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_touchSpeed = QPoint();
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}
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} else {
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// we average the speed to avoid strange effects with the last delta
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if (!_touchSpeed.isNull()) {
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_touchSpeed.setX(snap((_touchSpeed.x() / 4) + (newSpeedX * 3 / 4), -MaxScrollFlick, +MaxScrollFlick));
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_touchSpeed.setY(snap((_touchSpeed.y() / 4) + (newSpeedY * 3 / 4), -MaxScrollFlick, +MaxScrollFlick));
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} else {
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_touchSpeed = QPoint(newSpeedX, newSpeedY);
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}
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}
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}
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} else {
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_touchPrevPosValid = true;
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}
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_touchSpeedTime = nowTime;
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_touchPrevPos = _touchPos;
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}
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void ScrollArea::touchResetSpeed() {
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_touchSpeed = QPoint();
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_touchPrevPosValid = false;
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}
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bool ScrollArea::eventFilter(QObject *obj, QEvent *e) {
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bool res = QScrollArea::eventFilter(obj, e);
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if (e->type() == QEvent::TouchBegin || e->type() == QEvent::TouchUpdate || e->type() == QEvent::TouchEnd || e->type() == QEvent::TouchCancel) {
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QTouchEvent *ev = static_cast<QTouchEvent*>(e);
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if (_touchEnabled && ev->device()->type() == QTouchDevice::TouchScreen) {
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if (obj == widget()) {
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if (ev->type() != QEvent::TouchBegin || ev->touchPoints().isEmpty() || !widget() || !widget()->childAt(widget()->mapFromGlobal(ev->touchPoints().cbegin()->screenPos().toPoint()))) {
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touchEvent(ev);
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return true;
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}
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}
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}
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}
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return res;
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}
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bool ScrollArea::viewportEvent(QEvent *e) {
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if (e->type() == QEvent::TouchBegin || e->type() == QEvent::TouchUpdate || e->type() == QEvent::TouchEnd || e->type() == QEvent::TouchCancel) {
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QTouchEvent *ev = static_cast<QTouchEvent*>(e);
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if (_touchEnabled && ev->device()->type() == QTouchDevice::TouchScreen) {
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if (ev->type() != QEvent::TouchBegin || ev->touchPoints().isEmpty() || !widget() || !widget()->childAt(widget()->mapFromGlobal(ev->touchPoints().cbegin()->screenPos().toPoint()))) {
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touchEvent(ev);
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return true;
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}
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}
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}
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return QScrollArea::viewportEvent(e);
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}
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void ScrollArea::touchEvent(QTouchEvent *e) {
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if (!e->touchPoints().isEmpty()) {
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_touchPrevPos = _touchPos;
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_touchPos = e->touchPoints().cbegin()->screenPos().toPoint();
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}
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switch (e->type()) {
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case QEvent::TouchBegin:
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if (_touchPress || e->touchPoints().isEmpty()) return;
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_touchPress = true;
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if (_touchScrollState == TouchScrollAuto) {
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_touchScrollState = TouchScrollAcceleration;
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_touchWaitingAcceleration = true;
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_touchAccelerationTime = getms();
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touchUpdateSpeed();
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_touchStart = _touchPos;
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} else {
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_touchScroll = false;
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_touchTimer.start(QApplication::startDragTime());
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}
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_touchStart = _touchPrevPos = _touchPos;
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_touchRightButton = false;
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break;
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case QEvent::TouchUpdate:
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if (!_touchPress) return;
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if (!_touchScroll && (_touchPos - _touchStart).manhattanLength() >= QApplication::startDragDistance()) {
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_touchTimer.stop();
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_touchScroll = true;
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touchUpdateSpeed();
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}
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if (_touchScroll) {
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if (_touchScrollState == TouchScrollManual) {
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touchScrollUpdated(_touchPos);
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} else if (_touchScrollState == TouchScrollAcceleration) {
|
|
touchUpdateSpeed();
|
|
_touchAccelerationTime = getms();
|
|
if (_touchSpeed.isNull()) {
|
|
_touchScrollState = TouchScrollManual;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case QEvent::TouchEnd:
|
|
if (!_touchPress) return;
|
|
_touchPress = false;
|
|
if (_touchScroll) {
|
|
if (_touchScrollState == TouchScrollManual) {
|
|
_touchScrollState = TouchScrollAuto;
|
|
_touchPrevPosValid = false;
|
|
_touchScrollTimer.start(15);
|
|
_touchTime = getms();
|
|
} else if (_touchScrollState == TouchScrollAuto) {
|
|
_touchScrollState = TouchScrollManual;
|
|
_touchScroll = false;
|
|
touchResetSpeed();
|
|
} else if (_touchScrollState == TouchScrollAcceleration) {
|
|
_touchScrollState = TouchScrollAuto;
|
|
_touchWaitingAcceleration = false;
|
|
_touchPrevPosValid = false;
|
|
}
|
|
} else if (window() && widget()) { // one short tap -- like left mouse click, one long tap -- like right mouse click
|
|
#ifdef Q_OS_WIN
|
|
Qt::MouseButton btn(_touchRightButton ? Qt::RightButton : Qt::LeftButton);
|
|
QPoint mapped(widget()->mapFromGlobal(_touchStart)), winMapped(window()->mapFromGlobal(_touchStart));
|
|
|
|
QMouseEvent pressEvent(QEvent::MouseButtonPress, mapped, winMapped, _touchStart, btn, Qt::MouseButtons(btn), Qt::KeyboardModifiers());
|
|
pressEvent.accept();
|
|
qt_sendSpontaneousEvent(widget(), &pressEvent);
|
|
|
|
QMouseEvent releaseEvent(QEvent::MouseButtonRelease, mapped, winMapped, _touchStart, btn, Qt::MouseButtons(btn), Qt::KeyboardModifiers());
|
|
qt_sendSpontaneousEvent(widget(), &releaseEvent);
|
|
|
|
if (_touchRightButton) {
|
|
QContextMenuEvent contextEvent(QContextMenuEvent::Mouse, mapped, _touchStart);
|
|
qt_sendSpontaneousEvent(widget(), &contextEvent);
|
|
}
|
|
#endif
|
|
}
|
|
_touchTimer.stop();
|
|
_touchRightButton = false;
|
|
break;
|
|
|
|
case QEvent::TouchCancel:
|
|
_touchPress = false;
|
|
_touchScroll = false;
|
|
_touchScrollState = TouchScrollManual;
|
|
_touchTimer.stop();
|
|
break;
|
|
}
|
|
}
|
|
|
|
void ScrollArea::touchScrollUpdated(const QPoint &screenPos) {
|
|
_touchPos = screenPos;
|
|
touchScroll(_touchPos - _touchPrevPos);
|
|
touchUpdateSpeed();
|
|
}
|
|
|
|
bool ScrollArea::touchScroll(const QPoint &delta) {
|
|
int32 scTop = scrollTop(), scMax = scrollTopMax(), scNew = snap(scTop - delta.y(), 0, scMax);
|
|
if (scNew == scTop) return false;
|
|
|
|
scrollToY(scNew);
|
|
return true;
|
|
}
|
|
|
|
void ScrollArea::resizeEvent(QResizeEvent *e) {
|
|
QScrollArea::resizeEvent(e);
|
|
hor.recountSize();
|
|
vert.recountSize();
|
|
topSh.setGeometry(QRect(0, 0, width(), qAbs(_st.topsh)));
|
|
bottomSh.setGeometry(QRect(0, height() - qAbs(_st.bottomsh), width(), qAbs(_st.bottomsh)));
|
|
emit geometryChanged();
|
|
}
|
|
|
|
void ScrollArea::moveEvent(QMoveEvent *e) {
|
|
QScrollArea::moveEvent(e);
|
|
emit geometryChanged();
|
|
}
|
|
|
|
void ScrollArea::enterEvent(QEvent *e) {
|
|
if (_st.hiding) {
|
|
hor.hideTimeout(_st.hiding);
|
|
vert.hideTimeout(_st.hiding);
|
|
}
|
|
}
|
|
|
|
void ScrollArea::leaveEvent(QEvent *e) {
|
|
if (_st.hiding) {
|
|
hor.hideTimeout(0);
|
|
vert.hideTimeout(0);
|
|
}
|
|
}
|
|
|
|
void ScrollArea::scrollToY(int toTop, int toBottom) {
|
|
int toMin = 0, toMax = scrollTopMax();
|
|
if (toTop < toMin) {
|
|
toTop = toMin;
|
|
} else if (toTop > toMax) {
|
|
toTop = toMax;
|
|
}
|
|
bool exact = (toBottom < 0);
|
|
|
|
int curTop = scrollTop(), curHeight = height(), curBottom = curTop + curHeight, scToTop = toTop;
|
|
if (!exact && toTop >= curTop) {
|
|
if (toBottom < toTop) toBottom = toTop;
|
|
if (toBottom <= curBottom) return;
|
|
|
|
scToTop = toBottom - curHeight;
|
|
if (scToTop > toTop) scToTop = toTop;
|
|
if (scToTop == curTop) return;
|
|
} else {
|
|
scToTop = toTop;
|
|
}
|
|
verticalScrollBar()->setValue(scToTop);
|
|
}
|
|
|
|
void ScrollArea::setWidget(QWidget *w) {
|
|
if (widget() && _touchEnabled) {
|
|
widget()->removeEventFilter(this);
|
|
if (!_widgetAcceptsTouch) widget()->setAttribute(Qt::WA_AcceptTouchEvents, false);
|
|
}
|
|
QScrollArea::setWidget(w);
|
|
if (w) {
|
|
w->setAutoFillBackground(false);
|
|
if (_touchEnabled) {
|
|
w->installEventFilter(this);
|
|
_widgetAcceptsTouch = w->testAttribute(Qt::WA_AcceptTouchEvents);
|
|
w->setAttribute(Qt::WA_AcceptTouchEvents);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ScrollArea::rangeChanged(int oldMax, int newMax, bool vertical) {
|
|
}
|