ClickBlurLabel: Create a label which is blurred until it is clicked

This is particularly useful for people who stream their desktop and don't want to accidentally leak their IP or room.

Source/Core/DolphinQt/NetPlay/ClickBlurLabel.cpp

@@ -0,0 +1,66 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "DolphinQt/NetPlay/ClickBlurLabel.h"
+
+#include <QChar>
+#include <QGraphicsBlurEffect>
+#include <QLabel>
+#include <QMouseEvent>
+#include <QStackedWidget>
+#include <QString>
+#include <QWidget>
+
+#include "Common/CommonTypes.h"
+#include "Common/Random.h"
+
+ClickBlurLabel::ClickBlurLabel(QWidget* parent)
+    : QStackedWidget(parent), m_normal_label(new QLabel(this)), m_blurred_label(new QLabel(this))
+{
+  setCursor(Qt::PointingHandCursor);
+
+  // We use a QStackedWidget with a pre-blurred label instead of applying QGraphicsBlurEffect on
+  // click, because creating the blur effect on demand can cause a visible delay on lower-end
+  // hardware.
+  auto* blur = new QGraphicsBlurEffect(m_blurred_label);
+  blur->setBlurRadius(7);
+  m_blurred_label->setGraphicsEffect(blur);
+
+  // We don't want to take up more space than the labels take
+  setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
+
+  addWidget(m_blurred_label);
+  addWidget(m_normal_label);
+}
+
+void ClickBlurLabel::setText(const QString& text)
+{
+  if (this->text() == text)
+    return;
+
+  m_normal_label->setText(text);
+  m_blurred_label->setText(GenerateBlurredText(text));
+}
+
+void ClickBlurLabel::mousePressEvent(QMouseEvent* event)
+{
+  int current = currentIndex();
+  setCurrentIndex(current == 0 ? 1 : 0);
+  QWidget::mousePressEvent(event);
+}
+
+QString ClickBlurLabel::GenerateBlurredText(const QString& text)
+{
+  QString blurred_text;
+  blurred_text.reserve(text.size());
+  for (const QChar& c : text)
+  {
+    if (c.isLetter())
+      blurred_text += QChar((c.isUpper() ? 'A' : 'a') + (Common::Random::GenerateValue<u8>() % 26));
+    else if (c.isDigit())
+      blurred_text += QChar('0' + (Common::Random::GenerateValue<u8>() % 10));
+    else
+      blurred_text += c;
+  }
+  return blurred_text;
+}