From 0f0167c0211acd69c104ab6c7c1caa8fa85d7e4f Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Mon, 30 Dec 2024 17:01:55 +1100
Subject: start UI framework

---
 ui.hpp | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 72 insertions(+), 1 deletion(-)

(limited to 'ui.hpp')

diff --git a/ui.hpp b/ui.hpp
index 2b671ae..432b615 100644
--- a/ui.hpp
+++ b/ui.hpp
@@ -1,9 +1,12 @@
 #ifndef ui_hpp
 #define ui_hpp
 
+#include "app.hpp"
 #include "maths.hpp"
 #include "video.hpp"
 
+#include <new>
+
 struct Arena;
 struct UI {
 	struct Vertex {
@@ -24,6 +27,10 @@ struct UI {
 
 		Rect() = default;
 		Rect(int x, int y, int w, int h);
+
+		void clip(const Rect& other);
+		void shrink(int a);
+		bool contains(int px, int py);
 	};
 
 	struct Vertex_Buffer {
@@ -77,6 +84,8 @@ struct UI {
 		Vertex_Buffer* next;
 	};
 
+	struct Element;
+
 	Heap* heap;
 	Device* device;
 	Texture_Id atlas;
@@ -87,6 +96,7 @@ struct UI {
 	Vertex_Buffer mesh;
 	Pipeline* pipeline;
 	Render_Pass* render_pass;
+	Element* root, * hot, * hovered;
 
 	struct UI_CBuffer {
 		m4f projection;
@@ -109,8 +119,69 @@ struct UI {
 		Shader_Id sh
 	);
 	void destroy();
-	void update(Arena* s);
+	void update(Arena* s, const App& app);
 	void render(Arena* s, Texture_Id target);
+
+	void draw_container(const Rect& r);
+	void draw_containeri(const Rect& r);
+
+	Element* alloc_element(size_t size);
+	template <typename T, typename... Args>
+	T* create_element(Element* parent, Args... args) {
+		T* e = (T*)alloc_element(sizeof(T));
+		new (e) T(this, parent, args...);
+		return e;
+	}
+
+	struct Message {
+		enum class Type {
+			click
+		} type;
+	};
+
+	typedef int (*Message_Handler)(Element* e, const Message& m);
+
+	struct Element {
+		UI* ui;
+		Element* parent;
+		Element** children;
+		Message_Handler handler;
+		Rect bound, clip;
+		int child_count;
+
+		Element(UI* ui, Element* parent);
+		virtual ~Element();
+
+		virtual Rect layout(const Rect& avail);
+		void update(const App& app);
+		virtual void on_render();
+		virtual void on_message(const Message& msg);
+
+		void add_child(Element* ch);
+		void message(const Message& msg);
+		void render();
+	};
+
+	struct Container : Element {
+		int padding;
+		Container(UI* ui, Element* parent);
+
+		Rect layout(const Rect& avail) override;
+	};
+
+	struct Toolbar : Element {
+		int padding;
+		Toolbar(UI* ui, Element* parent);
+		Rect layout(const Rect& avail) override;
+		void on_render() override;
+	};
+
+	struct Button : Element {
+		char* text;
+		Button(UI* ui, Element* parent, const char* label);
+		Rect layout(const Rect& avail) override;
+		void on_render() override;
+	};
 };
 
 #endif
-- 
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