OmniaFramework/src/ogfx/gui/widgets/Scrollbar.hpp

/*
	OmniaFramework - A collection of useful functionality
	Copyright (C) 2026  OmniaX-Dev

	This file is part of OmniaFramework.

	OmniaFramework is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	OmniaFramework is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with OmniaFramework.  If not, see <https://www.gnu.org/licenses/>.
*/

#pragma once

#include <ogfx/gui/widgets/Widget.hpp>
#include <ostd/utils/Time.hpp>

namespace ogfx
{
	namespace gui
	{
		class VerticalScrollBar : public Widget
		{
			public:
				inline VerticalScrollBar(Window& window) : Widget({ 0, 0, 0, 0 }, window) { create(); }
				VerticalScrollBar& create(void);
				void applyTheme(const ostd::Stylesheet& theme) override;
				void afterDraw(ogfx::BasicRenderer2D& gfx) override;
				void onMouseDragged(const Event& event) override;
				void onMousePressed(const Event& event) override;
				void onMouseReleased(const Event& event) override;
				void onUpdate(void) override;
				bool isMouseInsideThumb(const Vec2& mouse_pos);

				inline void setx(f32 xx) override {  }
				inline void sety(f32 yy) override {  }
				inline void setw(f32 ww) override {  }
				inline void seth(f32 hh) override {  }

			private:
				void update_thumb(void);
				void set_thumb_y(f32 thumby);

			private:
				f32 m_thumbHeight { 0 };
				f32 m_thumbY { 0 };
				Rectangle m_thumbGlobalBounds { 0, 0, 0, 0 };
				bool m_mousePressed { false };
				bool m_mouseDragged { false };
				f32 m_dragGrabOffset { 0 };
				Rectangle m_correctionOffset { 1, 1, 0, 0 };

				Rectangle m_trackBorderRadii { 0, 0, 0, 0 };
				f32 m_thumbBorderRadius { 16 };
				Color m_trackColor { 70, 70, 70 };
				Color m_thumbColor { 120, 120, 120 };
				Color m_thumbBorderColor { 150, 150, 150 };
				bool m_thumbShowBorder { true };
		};
		class HorizontalScrollbar : public Widget
		{
			public:
				inline HorizontalScrollbar(Window& window) : Widget({ 0, 0, 0, 0 }, window) { create(); }
				HorizontalScrollbar& create(void);
				void applyTheme(const ostd::Stylesheet& theme) override;
				void afterDraw(ogfx::BasicRenderer2D& gfx) override;
				void onMouseDragged(const Event& event) override;
				void onMousePressed(const Event& event) override;
				void onMouseReleased(const Event& event) override;
				void onUpdate(void) override;
				bool isMouseInsideThumb(const Vec2& mouse_pos);

				inline void setx(f32 xx) override {  }
				inline void sety(f32 yy) override {  }
				inline void setw(f32 ww) override {  }
				inline void seth(f32 hh) override {  }

			private:
				void update_thumb(void);
				void set_thumb_x(f32 thumbx);

			private:
				f32 m_thumbWidth { 0 };
				f32 m_thumbX { 0 };
				Rectangle m_thumbGlobalBounds { 0, 0, 0, 0 };
				bool m_mousePressed { false };
				bool m_mouseDragged { false };
				f32 m_dragGrabOffset { 0 };
				Rectangle m_correctionOffset { 0, 0, 0, 0 };

				Rectangle m_trackBorderRadii { 0, 0, 0, 0 };
				f32 m_thumbBorderRadius { 16 };
				Color m_trackColor { 70, 70, 70 };
				Color m_thumbColor { 120, 120, 120 };
				Color m_thumbBorderColor { 150, 150, 150 };
				bool m_thumbShowBorder { true };
		};
		class ScrollableWidget : public Widget
		{
			public:
				inline ScrollableWidget(Window& window) : Widget({ 0, 0, 0, 0 }, window) { create(); }
				ScrollableWidget& create(void);
				virtual void onUpdate(void) override;
				void drawScrollbars(ogfx::BasicRenderer2D& gfx);
				void updateScrollbarsSize(void);
				void resetScroll(bool horizontal = true, bool vertical = true, bool propagate = true) override;
				bool isMouseInsideVScrollbar(void) const;
				bool isMouseInsideHScrollbar(void) const;
				inline bool isMouseInsideAnyScrollbar(void) const { return isMouseInsideVScrollbar() || isMouseInsideHScrollbar(); }
				virtual void onMouseScrolled(const Event& event) override;
				virtual void setScrollOffset(const Vec2& offset) override;
				virtual void addScrollOffset(const Vec2& offset) override;
				virtual bool needsVScroll(void) const override;
				virtual bool needsHScroll(void) const override;
				virtual void onWidgetAdded(Widget& child) override;
				virtual f32 getVScrollbarSize(void) const override;
				virtual f32 getHScrollbarSize(void) const override;
				inline Vec2 getScrollOffset(void) const override { return m_scrollOffset; }
				inline void setScrollSpeed(f32 speed) { m_scrollSpeed = speed; }
				inline f32 getScrollSpeed(void) const { return m_scrollSpeed; }
				inline void setScrollSmoothFactor(f32 speed) { m_scrollSmoothFactor = std::clamp(speed, 0.0f, 1.0f); }
				inline f32 getScrollSmoothFactor(void) const { return m_scrollSmoothFactor; }

			private:
				String m_title { "Panel" };
				Vec2 m_scrollOffset { 0, 0 };
				VerticalScrollBar m_vScrollbar { getWindow() };
				HorizontalScrollbar m_hScrollbar { getWindow() };
				ostd::StepTimer m_smoothScrollTimer;
				f32 m_scrollSpeed { 0.8f };
				Vec2 m_scrollVelocity { 0.0f, 0.0f };
				f32 m_scrollSmoothFactor { 0.7f };
				f32 m_scrollSpeedMultiplier { 15.0f };
				bool m_hScrollbarAdded { false };
				bool m_vScrollbarAdded { false };
		};
	}
}