Added ImageWidget (#139)

* Added ImageWidget

* Remove useless ResizeToContent function

* Add ResizeToContent function

* Forgot operators

* Added textures & colors functions

* oops

SDK/src/NDK/Widgets/ImageWidget.cpp

@@ -0,0 +1,37 @@
+// Copyright (C) 2017 Samy Bensaid
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequesites.hpp
+
+#include <NDK/Widgets/ImageWidget.hpp>
+#include <NDK/Components/NodeComponent.hpp>
+#include <NDK/Components/GraphicsComponent.hpp>
+
+namespace Ndk
+{
+	ImageWidget::ImageWidget(BaseWidget* parent) :
+	BaseWidget(parent)
+	{
+		m_entity = CreateEntity();
+		m_entity->AddComponent<NodeComponent>();
+		auto& gfx = m_entity->AddComponent<GraphicsComponent>();
+
+		m_sprite = Nz::Sprite::New();
+		gfx.Attach(m_sprite);
+	}
+
+	void ImageWidget::ResizeToContent()
+	{
+		Nz::Vector3ui textureSize = m_sprite->GetMaterial()->GetDiffuseMap()->GetSize();
+		SetSize({ static_cast<float>(textureSize.x), static_cast<float>(textureSize.y) });
+	}
+
+	void ImageWidget::Layout()
+	{
+		BaseWidget::Layout();
+		Nz::Vector2f origin = GetContentOrigin();
+		Nz::Vector2f contentSize = GetContentSize();
+
+		m_entity->GetComponent<NodeComponent>().SetPosition(origin);
+		m_sprite->SetSize(contentSize);
+	}
+}