输出测试，RenderableString基本完成

Window.h

@@ -4,10 +4,45 @@
 
 #pragma once
 
+#include "def.h"
 #include "Renderer.h"
 
+class Widget : public Renderable {
+protected:
+	int left = 0, top = 0, width = 0, height = 0;
+	mutable bool hasMouse = false;
+
+public:
+	using Action = Function<void()>;
+	double x, y, w, h;
+	Action hover;
+	Action longHover;
+	Action mouseDown;
+	Action mouseUp;
+	Action mouseLeave;
+	explicit Widget(const double x, const double y, const double w, const double h) : x(x), y(y), w(w), h(h) {}
+	void render() const noexcept override {}
+	virtual void onResize() {}
+
+	virtual bool isMouseIn(int x, int y) noexcept {
+		x -= left;
+		y -= top;
+		if (0 <= x and x <= width and 0 <= y and y <= height) hasMouse = true;
+		hasMouse = false;
+		return hasMouse;
+	}
+
+	virtual void onHover() noexcept { if (hover) hover(); }
+	virtual void onLongHover() noexcept { if (longHover) longHover(); }
+	virtual void onMouseDown() noexcept { if (mouseDown) mouseDown(); }
+	virtual void onMouseUp() noexcept { if (mouseUp) mouseUp(); }
+	virtual void onMouseLeave() noexcept { if (mouseLeave) mouseLeave(); }
+};
+
 class Window : public Renderable {
 protected:
+	List<Widget*> widgets;
+
 	Window() = default;
 
 public:
@@ -24,4 +59,17 @@ public:
 	 * 注意，关闭未必就是删除。
 	 */
 	virtual void onClose() = 0;
+	virtual void onResize();
+};
+
+class FloatWindow final : public Window {
+public:
+	void render() const noexcept override;
+	bool onOpen() override { return true; }
+	void onClose() override {}
+};
+
+class Button final : public Widget {
+public:
+	explicit Button(const double x, const double y, const double w, const double h) : Widget(x, y, w, h) {}
 };