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Telegram/SourceFiles/ui/controls/sub_tabs.h

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+/*
+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 style {
+struct SubTabs;
+} // namespace style
+
+namespace Ui {
+
+struct SubTabsOptions {
+	QString selected;
+	bool centered = false;
+};
+
+struct SubTabsTab {
+	QString id;
+	TextWithEntities text;
+
+	friend inline bool operator==(
+		const SubTabsTab &,
+		const SubTabsTab &) = default;
+};
+
+struct SubTabsReorderUpdate {
+	QString id;
+	int oldPosition = 0;
+	int newPosition = 0;
+	enum class State : uchar {
+		Started,
+		Applied,
+		Cancelled,
+	} state = State::Started;
+};
+
+class SubTabs : public RpWidget {
+public:
+	using Options = SubTabsOptions;
+	using Tab = SubTabsTab;
+
+	explicit SubTabs(
+		QWidget *parent,
+		const style::SubTabs &st,
+		Options options = {},
+		std::vector<Tab> tabs = {},
+		Text::MarkedContext context = {});
+
+	void setTabs(
+		std::vector<Tab> tabs,
+		Text::MarkedContext context = {});
+
+	void setActiveTab(const QString &id);
+
+	void setReorderEnabled(bool enabled);
+	[[nodiscard]] bool reorderEnabled() const;
+
+	void setPinnedInterval(int from, int to);
+	void clearPinnedIntervals();
+
+	[[nodiscard]] rpl::producer<QString> activated() const;
+	[[nodiscard]] rpl::producer<QString> contextMenuRequests() const;
+
+	using ReorderUpdate = SubTabsReorderUpdate;
+	[[nodiscard]] rpl::producer<ReorderUpdate> reorderUpdates() const;
+
+private:
+	struct Button {
+		Tab tab;
+		QRect geometry;
+		Text::String text;
+		bool active = false;
+		Ui::Animations::Simple shiftAnimation;
+		float64 shift = 0.;
+		float64 finalShift = 0.;
+		float64 deltaShift = 0.;
+	};
+
+	int resizeGetHeight(int newWidth) override;
+	void wheelEvent(QWheelEvent *e) override;
+	void mouseMoveEvent(QMouseEvent *e) override;
+	void mousePressEvent(QMouseEvent *e) override;
+	void mouseReleaseEvent(QMouseEvent *e) override;
+	void contextMenuEvent(QContextMenuEvent *e) override;
+	void paintEvent(QPaintEvent *e) override;
+	bool eventHook(QEvent *e) override;
+
+	void setSelected(int index);
+	void setActive(int index);
+	[[nodiscard]] QPoint scroll() const;
+	void shakeTransform(QPainter &p, int index, QPoint position, crl::time now) const;
+	[[nodiscard]] bool isIndexPinned(int index) const;
+
+	void startReorder(int index, QPoint globalPos);
+	void updateReorder(QPoint globalPos);
+	void finishReorder();
+	void cancelReorder();
+	void moveToShift(int index, float64 shift);
+	void updateShift(int index);
+
+	void checkForScrollAnimation();
+	void updateScrollCallback();
+	[[nodiscard]] int deltaFromEdge();
+
+	const style::SubTabs &_st;
+	std::vector<Button> _buttons;
+	rpl::event_stream<QString> _activated;
+	rpl::event_stream<QString> _contextMenuRequests;
+	rpl::event_stream<ReorderUpdate> _reorderUpdates;
+	std::optional<Qt::Orientation> _locked;
+	int _dragx = 0;
+	int _pressx = 0;
+	float64 _dragscroll = 0.;
+	float64 _scroll = 0.;
+	float64 _scrollTo = 0.;
+	Ui::Animations::Simple _scrollAnimation;
+	Ui::Animations::Basic _reorderScrollAnimation;
+	int _scrollMax = 0;
+	int _fullShift = 0;
+	int _fullWidth = 0;
+	int _selected = -1;
+	int _pressed = -1;
+	int _active = -1;
+	bool _centered = false;
+	bool _reorderEnable = false;
+	Ui::Animations::Basic _shakeAnimation;
+	struct PinnedInterval {
+		int from;
+		int to;
+	};
+	std::vector<PinnedInterval> _pinnedIntervals;
+
+	int _reorderIndex = -1;
+	float64 _reorderStart = 0.;
+	int _reorderDesiredIndex = 0;
+	SubTabsReorderUpdate::State _reorderState
+		= SubTabsReorderUpdate::State::Cancelled;
+	QPoint _reorderMousePos;
+
+};
+
+} // namespace Ui