Layouts (#189)

* Layout WIP

* Widgets/BoxLayout: Fix layout algorithm

* Widgets/BoxLayout: Fix box layout algorithm for good

* SDK/Widgets: Remove padding

* Sdk/Widgets: Make use of minimum/preferred size

* Sdk/TextAreaWidget: Add Minimum/PreferredSize to TextArea

* Sdk/Widgets: Add height/width variants of get/set fixed, maximum, minimum and preferred size methods

* Sdk/BoxLayout: Remove useless code

* Sdk/TextAreaWidget: Fix compilation

* Widgets/TextAreaWidget: Fix cursor position

SDK/include/NDK/Widgets/BoxLayout.hpp

@@ -0,0 +1,48 @@
+// Copyright (C) 2017 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_BOXLAYOUT_HPP
+#define NDK_WIDGETS_BOXLAYOUT_HPP
+
+#include <NDK/Prerequisites.hpp>
+#include <NDK/BaseWidget.hpp>
+#include <NDK/Widgets/Enums.hpp>
+#include <vector>
+
+namespace Ndk
+{
+	class NDK_API BoxLayout : public BaseWidget
+	{
+		public:
+			inline BoxLayout(BaseWidget* parent, BoxLayoutOrientation orientation);
+			BoxLayout(const BoxLayout&) = delete;
+			BoxLayout(BoxLayout&&) = default;
+			~BoxLayout() = default;
+
+			void Layout() override;
+
+			BoxLayout& operator=(const BoxLayout&) = delete;
+			BoxLayout& operator=(BoxLayout&&) = default;
+
+		private:
+			struct ChildInfo
+			{
+				BaseWidget* widget;
+				bool isConstrained;
+				float maximumSize;
+				float minimumSize;
+				float size;
+			};
+
+			std::vector<ChildInfo> m_childInfos;
+			BoxLayoutOrientation m_orientation;
+			float m_spacing;
+	};
+}
+
+#include <NDK/Widgets/BoxLayout.inl>
+
+#endif // NDK_WIDGETS_BOXLAYOUT_HPP