From 7c045a50dbe788049ca3cf7f39b666ce970cc234 Mon Sep 17 00:00:00 2001
From: Lynix <lynix680@gmail.com>
Date: Fri, 5 Jul 2019 22:25:45 +0200
Subject: [PATCH] SDK/BaseWidget: Add Rendering rect

---
 ChangeLog.md                   |  1 +
 SDK/include/NDK/BaseWidget.hpp |  6 ++++++
 SDK/include/NDK/BaseWidget.inl | 12 ++++++++++++
 SDK/src/NDK/BaseWidget.cpp     |  8 +++++++-
 4 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/ChangeLog.md b/ChangeLog.md
index 5cc4c9924..e448c5df6 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -272,6 +272,7 @@ Nazara Development Kit:
 - Added Entity::OnEntity[Disabled|Enabled] signals
 - Added BaseWidget::SetParent
 - BaseWidget::Show will no longer show entities disabled by the widget
+- BaseWidget now has a rendering rect property (allowing to tell a widget what part of it will be rendered)
 
 # 0.4:
 
diff --git a/SDK/include/NDK/BaseWidget.hpp b/SDK/include/NDK/BaseWidget.hpp
index ec69cb813..010abd437 100644
--- a/SDK/include/NDK/BaseWidget.hpp
+++ b/SDK/include/NDK/BaseWidget.hpp
@@ -39,6 +39,7 @@ namespace Ndk
 			inline void CenterVertical();
 
 			void ClearFocus();
+			inline void ClearRenderingRect();
 
 			void Destroy();
 
@@ -66,6 +67,8 @@ namespace Ndk
 			inline Nz::Vector2f GetPreferredSize() const;
 			inline float GetPreferredWidth() const;
 
+			inline const Nz::Rectf& GetRenderingRect() const;
+
 			inline Nz::Vector2f GetSize() const;
 			inline float GetWidth() const;
 			inline std::size_t GetWidgetChildCount() const;
@@ -93,6 +96,8 @@ namespace Ndk
 			inline void SetMinimumSize(const Nz::Vector2f& minimumSize);
 			inline void SetMinimumWidth(float minimumWidth);
 
+			virtual void SetRenderingRect(const Nz::Rectf& renderingRect);
+
 			void Show(bool show = true);
 
 			BaseWidget& operator=(const BaseWidget&) = delete;
@@ -151,6 +156,7 @@ namespace Ndk
 			EntityOwner m_backgroundEntity;
 			WorldHandle m_world;
 			Nz::Color m_backgroundColor;
+			Nz::Rectf m_renderingRect;
 			Nz::SpriteRef m_backgroundSprite;
 			Nz::SystemCursor m_cursor;
 			Nz::Vector2f m_maximumSize;
diff --git a/SDK/include/NDK/BaseWidget.inl b/SDK/include/NDK/BaseWidget.inl
index 4420a7a44..605220774 100644
--- a/SDK/include/NDK/BaseWidget.inl
+++ b/SDK/include/NDK/BaseWidget.inl
@@ -5,6 +5,7 @@
 #include <NDK/BaseWidget.hpp>
 #include <Nazara/Core/Error.hpp>
 #include <Nazara/Math/Algorithm.hpp>
+#include <limits>
 
 namespace Ndk
 {
@@ -12,6 +13,7 @@ namespace Ndk
 	m_canvasIndex(InvalidCanvasIndex),
 	m_canvas(nullptr),
 	m_backgroundColor(Nz::Color(230, 230, 230, 255)),
+	m_renderingRect(-std::numeric_limits<float>::infinity(), -std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()),
 	m_cursor(Nz::SystemCursor_Default),
 	m_size(50.f, 50.f),
 	m_maximumSize(std::numeric_limits<float>::infinity()),
@@ -66,6 +68,11 @@ namespace Ndk
 		SetPosition(GetPosition(Nz::CoordSys_Local).x, (parentSize.y - mySize.y) / 2.f);
 	}
 
+	inline void BaseWidget::ClearRenderingRect()
+	{
+		SetRenderingRect(Nz::Rectf(-std::numeric_limits<float>::infinity(), -std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()));
+	}
+
 	template<typename F>
 	inline void BaseWidget::ForEachWidgetChild(F iterator)
 	{
@@ -145,6 +152,11 @@ namespace Ndk
 		return m_preferredSize.x;
 	}
 
+	inline const Nz::Rectf& BaseWidget::GetRenderingRect() const
+	{
+		return m_renderingRect;
+	}
+
 	inline Nz::Vector2f BaseWidget::GetSize() const
 	{
 		return Nz::Vector2f(GetWidth(), GetHeight());
diff --git a/SDK/src/NDK/BaseWidget.cpp b/SDK/src/NDK/BaseWidget.cpp
index ed3b8265c..647f451c6 100644
--- a/SDK/src/NDK/BaseWidget.cpp
+++ b/SDK/src/NDK/BaseWidget.cpp
@@ -336,7 +336,13 @@ namespace Ndk
 		Nz::Vector2f widgetPos = Nz::Vector2f(GetPosition());
 		Nz::Vector2f widgetSize = GetSize();
 
-		Nz::Recti fullBounds(Nz::Rectf(widgetPos.x, widgetPos.y, widgetSize.x, widgetSize.y));
+		Nz::Rectf widgetRect(widgetPos.x, widgetPos.y, widgetSize.x, widgetSize.y);
+		Nz::Rectf widgetRenderingRect(widgetPos.x + m_renderingRect.x, widgetPos.y + m_renderingRect.y, m_renderingRect.width, m_renderingRect.height);
+
+		Nz::Rectf widgetBounds;
+		widgetRect.Intersect(widgetRenderingRect, &widgetBounds);
+
+		Nz::Recti fullBounds(widgetBounds);
 		for (WidgetEntity& widgetEntity : m_entities)
 		{
 			const Ndk::EntityHandle& entity = widgetEntity.handle;