177 lines
3.8 KiB
C++
177 lines
3.8 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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#pragma once
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#include <QtWidgets/QScrollArea>
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#include "style.h"
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enum TouchScrollState {
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TouchScrollManual, // Scrolling manually with the finger on the screen
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TouchScrollAuto, // Scrolling automatically
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TouchScrollAcceleration // Scrolling automatically but a finger is on the screen
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};
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class ScrollArea;
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class ScrollShadow : public QWidget {
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Q_OBJECT
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public:
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ScrollShadow(ScrollArea *parent, const style::flatScroll *st);
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void paintEvent(QPaintEvent *e);
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public slots:
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void changeVisibility(bool shown);
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private:
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const style::flatScroll *_st;
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};
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class ScrollBar : public QWidget, public Animated {
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Q_OBJECT
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public:
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ScrollBar(ScrollArea *parent, bool vertical, const style::flatScroll *st);
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void recountSize();
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void paintEvent(QPaintEvent *e);
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void enterEvent(QEvent *e);
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void leaveEvent(QEvent *e);
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void mouseMoveEvent(QMouseEvent *e);
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void mousePressEvent(QMouseEvent *e);
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void mouseReleaseEvent(QMouseEvent *e);
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void resizeEvent(QResizeEvent *e);
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bool animStep(float64 ms);
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void hideTimeout(int64 dt);
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public slots:
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void updateBar();
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void onHideTimer();
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signals:
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void topShadowVisibility(bool);
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void bottomShadowVisibility(bool);
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private:
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ScrollArea *_area;
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const style::flatScroll *_st;
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bool _vertical;
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bool _over, _overbar, _moving;
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bool _topSh, _bottomSh;
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QPoint _dragStart;
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QScrollBar *_connected;
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int32 _startFrom, _scrollMax;
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int64 _hideIn;
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QTimer _hideTimer;
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anim::cvalue a_bg, a_bar;
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QRect _bar;
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};
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class ScrollArea : public QScrollArea {
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Q_OBJECT
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public:
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ScrollArea(QWidget *parent, const style::flatScroll &st = st::scrollDef, bool handleTouch = true);
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bool viewportEvent(QEvent *e);
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void touchEvent(QTouchEvent *e);
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bool eventFilter(QObject *obj, QEvent *e);
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void resizeEvent(QResizeEvent *e);
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void moveEvent(QMoveEvent *e);
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void enterEvent(QEvent *e);
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void leaveEvent(QEvent *e);
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int scrollWidth() const;
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int scrollHeight() const;
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int scrollLeftMax() const;
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int scrollTopMax() const;
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int scrollLeft() const;
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int scrollTop() const;
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void setWidget(QWidget *widget);
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void rangeChanged(int oldMax, int newMax, bool vertical);
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void updateColors(const style::color &bar, const style::color &bg, const style::color &barOver, const style::color &bgOver);
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public slots:
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void scrollToY(int toTop, int toBottom = -1);
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void onScrolled();
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void onTouchTimer();
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void onTouchScrollTimer();
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signals:
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void scrolled();
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void scrollStarted();
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void scrollFinished();
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void geometryChanged();
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private:
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bool touchScroll(const QPoint &delta);
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void touchScrollUpdated(const QPoint &screenPos);
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void touchResetSpeed();
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void touchUpdateSpeed();
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void touchDeaccelerate(int32 elapsed);
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style::flatScroll _st;
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ScrollBar hor, vert;
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ScrollShadow topSh, bottomSh;
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int32 _horValue, _vertValue;
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bool _touchEnabled;
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QTimer _touchTimer;
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bool _touchScroll, _touchPress, _touchRightButton;
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QPoint _touchStart, _touchPrevPos, _touchPos;
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TouchScrollState _touchScrollState;
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bool _touchPrevPosValid, _touchWaitingAcceleration;
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QPoint _touchSpeed;
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uint64 _touchSpeedTime, _touchAccelerationTime, _touchTime;
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QTimer _touchScrollTimer;
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bool _widgetAcceptsTouch;
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};
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