feat: add display flag

src/gui/network/DisplayFlagButton.h

@@ -0,0 +1,17 @@
+#pragma once
+#include <QGraphicsItem>
+
+class DisplayFlagButton
+: public QGraphicsItem
+{
+public:
+    DisplayFlagButton(QGraphicsItem *parent = nullptr);
+    float getWidth();
+private:
+    QRectF baseRect_;
+    QColor disabledColor_=QColor("#373737");
+    QColor enabledColor_=QColor("#00BFFF");
+protected:
+    QRectF boundingRect() const override;    
+    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
+};