feat: add a new awesome feature

src/Canvas.cpp

@@ -1,4 +1,10 @@
 #include "Canvas.h"
+#include "SxLog.h"
+
+static bool SxIsNoisyMsg(UINT m)
+{
+	return m == WM_MOUSEMOVE;
+}
 
 Canvas::Canvas()
 	:Control(0, 0, 100, 100)
@@ -106,25 +112,57 @@ void Canvas::draw()
 
 bool Canvas::handleEvent(const ExMessage& msg)
 {
-	if (!show)return false;
+	if (!show) return false;
+
 	bool consumed = false;
 	bool anyDirty = false;
+	Control* firstConsumer = nullptr;
 
 	for (auto it = controls.rbegin(); it != controls.rend(); ++it)
 	{
-		consumed |= it->get()->handleEvent(msg);
-		if (it->get()->isDirty()) anyDirty = true;
+		Control* c = it->get();
+		bool cConsumed = c->handleEvent(msg);
+
+		if (cConsumed && !firstConsumer) firstConsumer = c;
+		consumed |= cConsumed;
+
+		if (c->isDirty()) anyDirty = true;
 	}
-	if (anyDirty) requestRepaint(parent);
+
+	if (firstConsumer && !SxIsNoisyMsg(msg.message))
+	{
+		SX_LOGD("Event") << SX_T("Canvas 消耗消息: ","Canvas consumed: msg=") << msg.message
+			<< SX_T("子控件"," by child")<<" id=" << firstConsumer->getId();
+	}
+
+	if (anyDirty)
+	{
+		if (!SxIsNoisyMsg(msg.message))
+			SX_LOGD("Dirty") << SX_T("Canvas检测有控件为脏状态 -> 请求重绘, ","Canvas anyDirty -> requestRepaint, ")<<"id = " << id;
+		requestRepaint(parent);
+	}
+
 	return consumed;
 }
 
+
 void Canvas::addControl(std::unique_ptr<Control> control)
 {
+
 	//坐标转化
 	control->setX(control->getLocalX() + this->x);
 	control->setY(control->getLocalY() + this->y);
 	control->setParent(this);
+	SX_LOGI("Canvas")
+		<< SX_T("添加子控件：父=Canvas 子id=", "addControl: parent=Canvas childId=")
+		<< control->getId()
+		<< SX_T(" 相对坐标=(", " local=(")
+		<< control->getLocalX() << "," << control->getLocalY()
+		<< SX_T(") 绝对坐标=(", ") abs=(")
+		<< control->getX() << "," << control->getY()
+		<< ")";
+
+
 	controls.push_back(std::move(control));
 	dirty = true;
 }
@@ -187,7 +225,6 @@ void Canvas::setIsVisible(bool visible)
 	for (auto& control : controls)
 	{
 		control->setIsVisible(visible);
-		control->setDirty(true);
 	}
 	if (!visible)
 		this->updateBackground();
@@ -375,10 +412,35 @@ void Canvas::requestRepaint(Control* parent)
 {
 	if (this == parent)
 	{
+		if (!show)
+			return;
+
+		// 关键护栏：
+		// - Canvas 自己是脏的 / 没有快照 / 缓存图为空
+		//   => 禁止局部重绘，直接升级为一次完整 draw（先把 dirty 置真，避免 draw() 早退）
+		if (dirty || !hasSnap || !saveBkImage)
+		{
+			SX_LOGD("Dirty")
+				<< SX_T("Canvas 局部重绘降级为全量重绘: id=", "Canvas partial->full draw: id=")
+				<< id
+				<< " dirty=" << (dirty ? 1 : 0)
+				<< " hasSnap=" << (hasSnap ? 1 : 0);
+
+			this->dirty = true;
+			this->draw();
+			return;
+		}
+
+		SX_LOGD("Dirty") << SX_T("Canvas 请求局部重绘：id=", "Canvas::requestRepaint(partial): id=") << id;
+
 		for (auto& control : controls)
 			if (control->isDirty() && control->IsVisible())
 				control->draw();
+
+		return;
 	}
-	else
-		onRequestRepaintAsRoot();
-}
+
+	SX_LOGD("Dirty") << SX_T("Canvas 请求根级重绘：id=", "Canvas::requestRepaint(root): id=") << id;
+	onRequestRepaintAsRoot();
+}
+