feat: Add multiplayer_room_overlay.h

src/citron/util/multiplayer_room_overlay.h

@@ -0,0 +1,77 @@
+// SPDX-FileCopyrightText: Copyright 2025 citron Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <QWidget>
+#include <QTimer>
+#include <QPainter>
+#include <QLabel>
+#include <QGridLayout>
+
+#include "citron/multiplayer/state.h"
+#include "citron/multiplayer/chat_room.h"
+
+class GMainWindow;
+class QSizeGrip;
+
+class MultiplayerRoomOverlay : public QWidget {
+    Q_OBJECT
+
+public:
+    explicit MultiplayerRoomOverlay(GMainWindow* parent);
+    ~MultiplayerRoomOverlay() override;
+
+    void SetVisible(bool visible);
+    bool IsVisible() const { return is_visible; }
+
+public slots:
+    // These slots are connected to the main window to prevent crashes.
+    void OnEmulationStarting();
+    void OnEmulationStopping();
+
+protected:
+    void paintEvent(QPaintEvent* event) override;
+    void resizeEvent(QResizeEvent* event) override;
+    void mousePressEvent(QMouseEvent* event) override;
+    void mouseMoveEvent(QMouseEvent* event) override;
+    void mouseReleaseEvent(QMouseEvent* event) override;
+    bool eventFilter(QObject* watched, QEvent* event) override;
+
+private slots:
+    void UpdateRoomData();
+
+private:
+    void UpdatePosition();
+    void ConnectToRoom();
+    void DisconnectFromRoom();
+
+    GMainWindow* main_window;
+    QTimer update_timer;
+
+    // UI Elements
+    QLabel* players_online_label;
+    ChatRoom* chat_room_widget;
+    QGridLayout* main_layout;
+    QSizeGrip* size_grip;
+
+    // Network and Data
+    MultiplayerState* multiplayer_state = nullptr;
+    std::shared_ptr<Network::RoomMember> room_member;
+
+    // Display settings
+    bool is_visible = false;
+    QColor background_color;
+    QColor border_color;
+
+    // Layout
+    int padding = 12;
+    int border_width = 1;
+    int corner_radius = 10;
+
+    // Drag functionality
+    bool is_dragging = false;
+    bool has_been_moved = false;
+    QPoint drag_start_pos;
+    QPoint widget_start_pos;
+};