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/CMakeLists.txt

@@ -284,6 +284,8 @@ add_executable(dolphin-emu
   NetPlay/GameDigestDialog.h
   NetPlay/GameListDialog.cpp
   NetPlay/GameListDialog.h
+  NetPlay/ClickBlurLabel.cpp
+  NetPlay/ClickBlurLabel.h
   NetPlay/NetPlayBrowser.cpp
   NetPlay/NetPlayBrowser.h
   NetPlay/NetPlayDialog.cpp

Source/Core/DolphinQt/DolphinQt.vcxproj

@@ -178,6 +178,7 @@
     <ClCompile Include="NetPlay\ChunkedProgressDialog.cpp" />
     <ClCompile Include="NetPlay\GameDigestDialog.cpp" />
     <ClCompile Include="NetPlay\GameListDialog.cpp" />
+    <ClCompile Include="NetPlay\ClickBlurLabel.cpp" />
     <ClCompile Include="NetPlay\NetPlayBrowser.cpp" />
     <ClCompile Include="NetPlay\NetPlayDialog.cpp" />
     <ClCompile Include="NetPlay\NetPlaySetupDialog.cpp" />
@@ -395,6 +396,7 @@
     <QtMoc Include="NetPlay\ChunkedProgressDialog.h" />
     <QtMoc Include="NetPlay\GameDigestDialog.h" />
     <QtMoc Include="NetPlay\GameListDialog.h" />
+    <QtMoc Include="NetPlay\ClickBlurLabel.h" />
     <QtMoc Include="NetPlay\NetPlayBrowser.h" />
     <QtMoc Include="NetPlay\NetPlayDialog.h" />
     <QtMoc Include="NetPlay\NetPlaySetupDialog.h" />

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;
+}

Source/Core/DolphinQt/NetPlay/ClickBlurLabel.h

@@ -0,0 +1,29 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <QLabel>
+#include <QStackedWidget>
+#include <QWidget>
+
+class ClickBlurLabel final : public QStackedWidget
+{
+  Q_OBJECT
+public:
+  explicit ClickBlurLabel(QWidget* parent = nullptr);
+
+  void setText(const QString& text);
+
+  QString text() const { return m_normal_label->text(); }
+
+protected:
+  void mousePressEvent(QMouseEvent* event) override;
+
+private:
+  // Generates text that "looks correct" but is actually gibberish.
+  static QString GenerateBlurredText(const QString& text);
+
+  QLabel* m_normal_label;
+  QLabel* m_blurred_label;
+};

Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp

@@ -48,6 +48,7 @@
 #include "Core/System.h"
 
 #include "DolphinQt/NetPlay/ChunkedProgressDialog.h"
+#include "DolphinQt/NetPlay/ClickBlurLabel.h"
 #include "DolphinQt/NetPlay/GameDigestDialog.h"
 #include "DolphinQt/NetPlay/GameListDialog.h"
 #include "DolphinQt/NetPlay/PadMappingDialog.h"
@@ -287,7 +288,7 @@ void NetPlayDialog::CreatePlayersLayout()
 {
   m_players_box = new QGroupBox(tr("Players"));
   m_room_box = new QComboBox;
-  m_hostcode_label = new QLabel;
+  m_hostcode_label = new ClickBlurLabel;
   m_hostcode_action_button = new QPushButton(tr("Copy"));
   m_players_list = new QTableWidget;
   m_kick_button = new QPushButton(tr("Kick Player"));

Source/Core/DolphinQt/NetPlay/NetPlayDialog.h

@@ -13,6 +13,7 @@
 #include "Common/Lazy.h"
 #include "Core/NetPlayClient.h"
 #include "DolphinQt/GameList/GameListModel.h"
+#include "DolphinQt/NetPlay/ClickBlurLabel.h"
 #include "VideoCommon/OnScreenDisplay.h"
 
 class BootSessionData;
@@ -127,7 +128,7 @@ private:
   // Players
   QGroupBox* m_players_box;
   QComboBox* m_room_box;
-  QLabel* m_hostcode_label;
+  ClickBlurLabel* m_hostcode_label;
   QPushButton* m_hostcode_action_button;
   QTableWidget* m_players_list;
   QPushButton* m_kick_button;