feat: add a new awesome feature

src/label.cpp

@@ -3,16 +3,18 @@
 Label::Label()
 	:Control(0, 0, 0, 0)
 {
+	this->id = "Label";
 	this->text = "默认标签";
-	textColor = RGB(0,0,0);
+	textStyle.color = RGB(0,0,0);
 	textBkColor = RGB(255, 255, 255);; //默认白色背景
 }
 
 Label::Label(int x, int y, std::string text, COLORREF textcolor, COLORREF bkColor)
 	:Control(x, y, 0, 0)
 {
+	this->id = "Label";
 	this->text = text;
-	textColor = textcolor;
+	textStyle.color = textcolor;
 	textBkColor = bkColor; //默认白色背景
 }
 
@@ -28,14 +30,21 @@ void Label::draw()
 			setbkmode(OPAQUE); //设置背景不透明
 			setbkcolor(textBkColor); //设置背景颜色
 		}
-		settextcolor(textColor);
+		settextcolor(textStyle.color);
 		settextstyle(textStyle.nHeight, textStyle.nWidth, textStyle.lpszFace,
 			textStyle.nEscapement, textStyle.nOrientation, textStyle.nWeight,
 			textStyle.bItalic, textStyle.bUnderline, textStyle.bStrikeOut);   //设置字体样式
-		this->saveBackground(x, y,textwidth(text.c_str()),textheight(text.c_str()));
-		this-> restBackground();
+		if (0 == this->width || 0 == this->height)
+		{
+			this->width = textwidth(text.c_str());
+			this->height = textheight(text.c_str());
+		}
+		if ((saveBkX != this->x) || (saveBkY != this->y) || (!hasSnap) || (saveWidth != this->width) || (saveHeight != this->height) || !saveBkImage)
+			saveBackground(this->x, this->y,this->width,this->height);
+		// 恢复背景（清除旧内容）
+		restBackground();
 		outtextxy(x, y, LPCTSTR(text.c_str()));
-		this->restoreStyle();
+		restoreStyle();
 		dirty = false;
 	}
 }
@@ -52,12 +61,6 @@ void Label::setTextdisap(bool key)
 	this->dirty = true;
 }
 
-void Label::setTextColor(COLORREF color)
-{
-	textColor = color;
-	this->dirty = true;
-}
-
 void Label::setTextBkColor(COLORREF color)
 {
 	textBkColor = color;
@@ -68,4 +71,5 @@ void Label::setText(std::string text)
 {
 	this->text = text;
 	this->dirty = true;
+	
 }