feat: add display flag

src/gui/network/DisplayFlagButton.cpp

@@ -0,0 +1,31 @@
+#include "gui/network/DisplayFlagButton.h"
+#include <QPainter>
+#include <qgraphicsitem.h>
+#include <qnamespace.h>
+
+DisplayFlagButton::DisplayFlagButton(QGraphicsItem *parent)
+: QGraphicsItem(parent)
+{
+    constexpr float width = 8;
+    constexpr float height = 14;
+    baseRect_ = QRectF(-width/2.0f, -height/2.0f, width, height);
+
+}
+
+void DisplayFlagButton::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+{
+    painter->setPen(Qt::NoPen);
+    painter->setBrush(QBrush(disabledColor_));
+    constexpr float roundRad = 3;
+    painter->drawRoundedRect(baseRect_, roundRad, roundRad);
+}
+
+QRectF DisplayFlagButton::boundingRect() const
+{
+    return baseRect_; 
+}
+
+float DisplayFlagButton::getWidth()
+{
+    return baseRect_.width();
+}