cascade opacity supported

Kiwano/2d/Node.cpp

@@ -46,12 +46,13 @@ namespace kiwano
 		, responsible_(false)
 		, dirty_transform_(false)
 		, dirty_transform_inverse_(false)
+		, cascade_opacity_(false)
 		, parent_(nullptr)
 		, scene_(nullptr)
 		, hash_name_(0)
 		, z_order_(0)
 		, opacity_(1.f)
-		, display_opacity_(1.f)
+		, displayed_opacity_(1.f)
 		, anchor_(default_anchor_x, default_anchor_y)
 	{
 	}
@@ -230,10 +231,15 @@ namespace kiwano
 
 	void Node::UpdateOpacity()
 	{
-		if (parent_)
+		if (parent_ && parent_->IsCascadeOpacityEnabled())
 		{
-			display_opacity_ = opacity_ * parent_->display_opacity_;
+			displayed_opacity_ = opacity_ * parent_->displayed_opacity_;
 		}
+		else
+		{
+			displayed_opacity_ = opacity_;
+		}
+
 		for (Node* child = children_.First().Get(); child; child = child->NextItem().Get())
 		{
 			child->UpdateOpacity();
@@ -298,7 +304,16 @@ namespace kiwano
 		if (opacity_ == opacity)
 			return;
 
-		display_opacity_ = opacity_ = std::min(std::max(opacity, 0.f), 1.f);
+		displayed_opacity_ = opacity_ = std::min(std::max(opacity, 0.f), 1.f);
+		UpdateOpacity();
+	}
+
+	void Node::SetCascadeOpacityEnabled(bool enabled)
+	{
+		if (cascade_opacity_ == enabled)
+			return;
+
+		cascade_opacity_ = enabled;
 		UpdateOpacity();
 	}
 
@@ -625,7 +640,7 @@ namespace kiwano
 	void VisualNode::PrepareRender()
 	{
 		Renderer::Instance().SetTransform(transform_matrix_);
-		Renderer::Instance().SetOpacity(display_opacity_);
+		Renderer::Instance().SetOpacity(displayed_opacity_);
 	}
 
 }

Kiwano/2d/Node.h

@@ -59,6 +59,9 @@ namespace kiwano
 		// 获取响应状态
 		bool IsResponsible()			const	{ return responsible_; }
 
+		// 是否启用级联透明度
+		bool IsCascadeOpacityEnabled()	const	{ return cascade_opacity_; }
+
 		// 获取名称的 Hash 值
 		size_t GetHashName()			const	{ return hash_name_; }
 
@@ -125,6 +128,9 @@ namespace kiwano
 		// 获取透明度
 		float GetOpacity()				const	{ return opacity_; }
 
+		// 获取显示透明度
+		float GetDisplayedOpacity()		const	{ return displayed_opacity_; }
+
 		// 获取变换
 		Transform GetTransform()		const	{ return transform_; }
 
@@ -296,6 +302,7 @@ namespace kiwano
 			const Size & size
 		);
 
+		// 设置二维仿射变换
 		void SetTransform(
 			Transform const& transform
 		);
@@ -306,6 +313,11 @@ namespace kiwano
 			float opacity
 		);
 
+		// 启用或禁用级联透明度
+		void SetCascadeOpacityEnabled(
+			bool enabled
+		);
+
 		// 设置 Z 轴顺序
 		// 默认为 0
 		void SetZOrder(
@@ -413,9 +425,10 @@ namespace kiwano
 		bool			pressed_;
 		bool			responsible_;
 		bool			update_pausing_;
+		bool			cascade_opacity_;
 		int				z_order_;
 		float			opacity_;
-		float			display_opacity_;
+		float			displayed_opacity_;
 		Node*			parent_;
 		Scene*			scene_;
 		size_t			hash_name_;