111 lines
2.3 KiB
C++
111 lines
2.3 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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#include "ui/rp_widget.h"
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#include "ui/effects/animations.h"
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namespace Ui {
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class PickerAnimation final {
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public:
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using Shift = float64;
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PickerAnimation();
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void jumpToOffset(int offset);
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void setResult(float64 from, float64 current, float64 to);
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[[nodiscard]] rpl::producer<Shift> updates() const;
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private:
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Ui::Animations::Simple _animation;
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struct {
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float64 from = 0.;
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float64 current = 0.;
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float64 to = 0.;
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} _result;
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rpl::event_stream<Shift> _updates;
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};
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class VerticalDrumPicker final : public Ui::RpWidget {
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public:
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using PaintItemCallback = Fn<void(
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QPainter &p,
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int index,
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float y,
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float64 distanceFromCenter,
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int outerWidth)>;
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VerticalDrumPicker(
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not_null<Ui::RpWidget*> parent,
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PaintItemCallback &&paintCallback,
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int itemsCount,
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int itemHeight,
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int startIndex = 0,
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bool looped = false);
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[[nodiscard]] int index() const;
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[[nodiscard]] rpl::producer<int> changes() const;
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[[nodiscard]] rpl::producer<int> value() const;
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void handleWheelEvent(not_null<QWheelEvent*> e);
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void handleMouseEvent(not_null<QMouseEvent*> e);
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void handleKeyEvent(not_null<QKeyEvent*> e);
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protected:
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void wheelEvent(QWheelEvent *e) override;
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void mousePressEvent(QMouseEvent *e) override;
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void mouseMoveEvent(QMouseEvent *e) override;
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void mouseReleaseEvent(QMouseEvent *e) override;
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void keyPressEvent(QKeyEvent *e) override;
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private:
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void increaseShift(float64 by);
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void animationDataFromIndex();
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[[nodiscard]] int normalizedIndex(int index) const;
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[[nodiscard]] bool isIndexInRange(int index) const;
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const int _itemsCount;
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const int _itemHeight;
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PaintItemCallback _paintCallback;
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int _pendingStartIndex = -1;
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struct {
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int count = 0;
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int centerOffset = 0;
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} _itemsVisible;
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int _index = 0;
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float64 _shift = 0.;
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rpl::event_stream<> _changes;
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struct {
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const bool looped;
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int minIndex = 0;
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int maxIndex = 0;
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} _loopData;
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PickerAnimation _animation;
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struct {
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bool pressed = false;
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int lastPositionY;
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bool clickDisabled = false;
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} _mouse;
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struct {
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int verticalDelta = 0;
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} _touch;
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};
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} // namespace Ui
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