Snapshot before repaint phase 2

Control.h

@@ -32,6 +32,8 @@
 #include <functional>
 #include "CoreTypes.h"
 
+class Window;
+
 class Control
 {
 protected:
@@ -39,6 +41,7 @@ protected:
 	int localx, x, localy, y;           // 左上角坐标
 	int localWidth, width, localHeight, height;  // 控件尺寸
 	Control* parent = nullptr;    // 父控件
+	Window* hostWindow = nullptr; // 宿主窗口（顶层由 Window 注入，子控件可沿 parent 回溯）
 	bool dirty = true; // 是否重绘
 	bool show = true; // 是否显示
 	bool eventVisualChanged = false; // 最近一次 handleEvent 是否真的引发了视觉变化
@@ -82,6 +85,7 @@ protected:
 	virtual void requestRepaint(Control* parent);
 	//根控件/无父时触发重绘
 	virtual void onRequestRepaintAsRoot();
+	bool shouldDeferManagedRepaint() const;
 protected:
 	//保存背景快照
 	virtual void saveBackground(int x, int y, int w, int h);
@@ -121,6 +125,10 @@ public:
 	virtual void setIsVisible(bool show);
 	//设置父容器指针
 	void setParent(Control* parent) { this->parent = parent; }
+	//设置宿主窗口（通常仅由顶层 Window/对话框注入）
+	virtual void setHostWindow(Window* host) { this->hostWindow = host; }
+	Window* getHostWindow() const;
+	RECT getBoundsRect() const;
 	//设置是否重绘
 	virtual void setDirty(bool dirty) { this->dirty = dirty; }
 	//检查控件是否可见