tdesktop/Telegram/SourceFiles/ui/widgets/vertical_drum_picker.h

109 lines
2.2 KiB
C++

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