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Telegram/SourceFiles/ui/widgets/discrete_sliders.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/round_rect.h"
+#include "ui/effects/animations.h"
+#include "ui/text/text.h"
+
+namespace style {
+struct TextStyle;
+struct SettingsSlider;
+} // namespace style
+
+namespace st {
+extern const style::SettingsSlider &defaultSettingsSlider;
+} // namespace st
+
+namespace Ui {
+
+class RippleAnimation;
+
+class DiscreteSlider : public RpWidget {
+public:
+	DiscreteSlider(QWidget *parent, bool snapToLabel);
+	~DiscreteSlider();
+
+	void addSection(const QString &label);
+	void addSection(
+		const TextWithEntities &label,
+		Text::MarkedContext context = {});
+	void setSections(const std::vector<QString> &labels);
+	void setSections(
+		const std::vector<TextWithEntities> &labels,
+		Text::MarkedContext context = {},
+		Fn<bool()> paused = nullptr);
+	int activeSection() const {
+		return _activeIndex;
+	}
+	void setActiveSection(int index);
+	void setActiveSectionFast(int index);
+	void finishAnimating();
+
+	void setAdditionalContentWidthToSection(int index, int width);
+
+	[[nodiscard]] rpl::producer<int> sectionActivated() const {
+		return _sectionActivated.events();
+	}
+
+	[[nodiscard]] int sectionsCount() const;
+	[[nodiscard]] int lookupSectionLeft(int index) const;
+
+protected:
+	void timerEvent(QTimerEvent *e) override;
+	void mousePressEvent(QMouseEvent *e) override;
+	void mouseMoveEvent(QMouseEvent *e) override;
+	void mouseReleaseEvent(QMouseEvent *e) override;
+
+	int resizeGetHeight(int newWidth) override = 0;
+
+	struct Section {
+		Section(const QString &label, const style::TextStyle &st);
+		Section(
+			const TextWithEntities &label,
+			const style::TextStyle &st,
+			const Text::MarkedContext &context);
+
+		Text::String label;
+		std::unique_ptr<RippleAnimation> ripple;
+		int left = 0;
+		int width = 0;
+		int contentWidth = 0;
+	};
+	struct Range {
+		int left = 0;
+		int width = 0;
+	};
+
+	[[nodiscard]] Range getFinalActiveRange() const;
+	[[nodiscard]] Range getCurrentActiveRange() const;
+
+	[[nodiscard]] int getSectionsCount() const {
+		return _sections.size();
+	}
+
+	void enumerateSections(Fn<bool(Section&)> callback);
+	void enumerateSections(Fn<bool(const Section&)> callback) const;
+
+	virtual void startRipple(int sectionIndex) {
+	}
+
+	void stopAnimation() {
+		_a_left.stop();
+		_a_width.stop();
+	}
+	void refresh();
+
+	void setSelectOnPress(bool selectOnPress);
+
+	[[nodiscard]] std::vector<Section> &sectionsRef();
+
+	[[nodiscard]] bool paused() const;
+
+private:
+	void activateCallback();
+	virtual const style::TextStyle &getLabelStyle() const = 0;
+	virtual int getAnimationDuration() const = 0;
+
+	int getIndexFromPosition(QPoint pos);
+	void setSelectedSection(int index);
+
+	std::vector<Section> _sections;
+	Fn<bool()> _paused;
+	int _activeIndex = 0;
+	bool _selectOnPress = true;
+	bool _snapToLabel = false;
+
+	rpl::event_stream<int> _sectionActivated;
+
+	int _pressed = -1;
+	int _selected = 0;
+	Ui::Animations::Simple _a_left;
+	Ui::Animations::Simple _a_width;
+
+	int _timerId = -1;
+	crl::time _callbackAfterMs = 0;
+
+};
+
+class SettingsSlider : public DiscreteSlider {
+public:
+	SettingsSlider(
+		QWidget *parent,
+		const style::SettingsSlider &st = st::defaultSettingsSlider);
+
+	[[nodiscard]] const style::SettingsSlider &st() const;
+
+	[[nodiscard]] int centerOfSection(int section) const;
+	virtual void fitWidthToSections();
+
+	void setRippleTopRoundRadius(int radius);
+
+protected:
+	void paintEvent(QPaintEvent *e) override;
+
+	int resizeGetHeight(int newWidth) override;
+
+	void startRipple(int sectionIndex) override;
+
+	std::vector<float64> countSectionsWidths(int newWidth) const;
+
+private:
+	const style::TextStyle &getLabelStyle() const override;
+	int getAnimationDuration() const override;
+	QImage prepareRippleMask(int sectionIndex, const Section &section);
+
+	void resizeSections(int newWidth);
+
+	const style::SettingsSlider &_st;
+	std::optional<Ui::RoundRect> _bar;
+	std::optional<Ui::RoundRect> _barActive;
+	int _rippleTopRoundRadius = 0;
+
+
+};
+
+} // namespace Ui