Snapshot before repaint phase 2

Control.cpp

@@ -1,6 +1,7 @@
 #include "Control.h"
 #include "SxLog.h"
 #include<assert.h>
+#include "Window.h"
 
 StellarX::ControlText& StellarX::ControlText::operator=(const ControlText& text)
 {
@@ -123,6 +124,13 @@ void Control::restoreStyle()
 
 void Control::requestRepaint(Control* parent)
 {
+	if (shouldDeferManagedRepaint())
+	{
+		if (auto* host = getHostWindow())
+			host->requestManagedRepaint();
+		return;
+	}
+
 	// 说明：
 	// - 常规路径：子控件调用 requestRepaint(this->parent)，然后 parent 负责局部重绘（Canvas/TabControl override）
 	// - 兜底路径：如果某个“容器控件”没 override requestRepaint，就会出现 parent==this 的递归风险
@@ -147,6 +155,13 @@ void Control::requestRepaint(Control* parent)
 
 void Control::onRequestRepaintAsRoot()
 {
+	if (shouldDeferManagedRepaint())
+	{
+		if (auto* host = getHostWindow())
+			host->requestManagedRepaint();
+		return;
+	}
+
 	SX_LOG_TRACE("Dirty")
 		<< SX_T("触发根重绘：id=", "onRequestRepaintAsRoot: id=") << id
 		<< SX_T("（从根节点开始重画）", " (root repaint)");
@@ -157,6 +172,29 @@ void Control::onRequestRepaintAsRoot()
 	draw();    // 只有“无父”时才允许立即画，不会被谁覆盖
 }
 
+bool Control::shouldDeferManagedRepaint() const
+{
+	Window* host = getHostWindow();
+	return host && host->isManagedDispatchActive();
+}
+
+Window* Control::getHostWindow() const
+{
+	if (hostWindow)
+		return hostWindow;
+	return parent ? parent->getHostWindow() : nullptr;
+}
+
+RECT Control::getBoundsRect() const
+{
+	RECT rc{};
+	rc.left = x;
+	rc.top = y;
+	rc.right = x + width;
+	rc.bottom = y + height;
+	return rc;
+}
+
 void Control::saveBackground(int x, int y, int w, int h)
 {