SDK: Add ScrollAreaWidget (WIP)

SDK/include/NDK/Widgets/ScrollAreaWidget.hpp

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+// Copyright (C) 2019 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequisites.hpp
+
+#pragma once
+
+#ifndef NDK_WIDGETS_SCROLLAREAWIDGET_HPP
+#define NDK_WIDGETS_SCROLLAREAWIDGET_HPP
+
+#include <NDK/Prerequisites.hpp>
+#include <NDK/BaseWidget.hpp>
+#include <Nazara/Graphics/TextSprite.hpp>
+
+namespace Ndk
+{
+	class NDK_API ScrollAreaWidget : public BaseWidget
+	{
+		public:
+			ScrollAreaWidget(BaseWidget* parent, BaseWidget* content);
+			ScrollAreaWidget(const ScrollAreaWidget&) = delete;
+			ScrollAreaWidget(ScrollAreaWidget&&) = default;
+			~ScrollAreaWidget() = default;
+
+			inline float GetScrollHeight() const;
+			inline float GetScrollRatio() const;
+
+			inline void ScrollToHeight(float height);
+			void ScrollToRatio(float ratio);
+
+			ScrollAreaWidget& operator=(const ScrollAreaWidget&) = delete;
+			ScrollAreaWidget& operator=(ScrollAreaWidget&&) = default;
+
+		private:
+			enum class ScrollBarStatus
+			{
+				Grabbed,
+				Hovered,
+				None
+			};
+
+			Nz::Rectf GetScrollbarRect() const;
+
+			void Layout() override;
+
+			void OnMouseButtonPress(int x, int y, Nz::Mouse::Button button) override;
+			void OnMouseButtonRelease(int x, int y, Nz::Mouse::Button button) override;
+			void OnMouseExit() override;
+			void OnMouseMoved(int x, int y, int deltaX, int deltaY) override;
+			void OnMouseWheelMoved(int x, int y, float delta) override;
+
+			void UpdateScrollbarStatus(ScrollBarStatus status);
+
+			BaseWidget* m_content;
+			EntityHandle m_scrollbarBackgroundEntity;
+			EntityHandle m_scrollbarEntity;
+			Nz::SpriteRef m_scrollbarBackgroundSprite;
+			Nz::SpriteRef m_scrollbarSprite;
+			Nz::Vector2i m_grabbedDelta;
+			ScrollBarStatus m_scrollbarStatus;
+			bool m_isScrollBarVisible;
+			float m_scrollRatio;
+	};
+}
+
+#include <NDK/Widgets/ScrollAreaWidget.inl>
+
+#endif // NDK_WIDGETS_SCROLLAREAWIDGET_HPP

SDK/include/NDK/Widgets/ScrollAreaWidget.inl

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+// Copyright (C) 2019 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequisites.hpp
+
+#include <NDK/Widgets/ScrollAreaWidget.hpp>
+
+namespace Ndk
+{
+	inline float ScrollAreaWidget::GetScrollHeight() const
+	{
+		return m_scrollRatio * m_content->GetHeight();
+	}
+
+	inline float ScrollAreaWidget::GetScrollRatio() const
+	{
+		return m_scrollRatio;
+	}
+
+	inline void ScrollAreaWidget::ScrollToHeight(float height)
+	{
+		float contentHeight = m_content->GetHeight();
+		ScrollToRatio(height / contentHeight);
+	}
+}