From 21d6076f5c8e1496344794c5168e4e23dc7b04fa Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Tue, 20 Jul 2021 14:03:39 +0300
Subject: [PATCH] Support cyclic ui::slider

---
 libs/ui/include/psemek/ui/slider.hpp | 5 +++++
 libs/ui/source/slider.cpp            | 5 ++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/libs/ui/include/psemek/ui/slider.hpp b/libs/ui/include/psemek/ui/slider.hpp
index 27fdd8a7..00ef3528 100644
--- a/libs/ui/include/psemek/ui/slider.hpp
+++ b/libs/ui/include/psemek/ui/slider.hpp
@@ -20,6 +20,9 @@ namespace psemek::ui
 		virtual int value() const { return value_; }
 		virtual void set_value(int v, bool notify = true);
 
+		virtual bool cyclic() const { return cyclic_; }
+		virtual void set_cyclic(bool cyclic) { cyclic_ = cyclic; }
+
 		using on_value_changed_callback = std::function<void(int)>;
 
 		void on_value_changed(on_value_changed_callback callback);
@@ -42,6 +45,8 @@ namespace psemek::ui
 		geom::interval<int> value_range_{0, 100};
 		int value_ = 0;
 
+		bool cyclic_ = false;
+
 		state_t state_ = state_t::normal;
 		std::optional<geom::point<int, 2>> mouse_;
 
diff --git a/libs/ui/source/slider.cpp b/libs/ui/source/slider.cpp
index 25adf4f3..18204d55 100644
--- a/libs/ui/source/slider.cpp
+++ b/libs/ui/source/slider.cpp
@@ -85,7 +85,10 @@ namespace psemek::ui
 
 	void slider::set_value(int v, bool notify)
 	{
-		v = geom::clamp(v, value_range_);
+		if (cyclic_)
+			v = geom::imod(v - value_range_.min, value_range_.length()) + value_range_.min;
+		else
+			v = geom::clamp(v, value_range_);
 		if (value_ != v)
 		{
 			value_ = v;