init

Telegram/SourceFiles/ui/effects/shake_animation.cpp

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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
+*/
+#include "ui/effects/shake_animation.h"
+
+#include "styles/style_basic.h"
+
+namespace Ui {
+
+Fn<void(float64)> DefaultShakeCallback(Fn<void(int)> applyShift) {
+	constexpr auto kShiftProgress = 6;
+	constexpr auto kSegmentsCount = 5;
+	return [=, applyShift = std::move(applyShift)](float64 value) {
+		const auto fullProgress = value * kShiftProgress;
+		const auto segment = std::clamp(
+			int(std::floor(fullProgress)),
+			0,
+			kSegmentsCount);
+		const auto part = fullProgress - segment;
+		const auto from = (segment == 0)
+			? 0.
+			: (segment == 1 || segment == 3 || segment == 5)
+			? 1.
+			: -1.;
+		const auto to = (segment == 0 || segment == 2 || segment == 4)
+			? 1.
+			: (segment == 1 || segment == 3)
+			? -1.
+			: 0.;
+		const auto shift = from * (1. - part) + to * part;
+		applyShift(int(base::SafeRound(shift * st::shakeShift)));
+	};
+}
+
+} // namespace Ui