feat: 支持自定义 Minecraft 窗口标题

全局开关 + 默认标题，实例可覆盖；Win32 重命名窗口。前端设置页同步。

apps/app-frontend/src/components/ui/instance_settings/WindowSettings.vue

@@ -36,24 +36,29 @@ const fullscreenSetting: Ref<boolean> = ref(
 	instance.value.force_fullscreen ?? globalSettings.force_fullscreen,
 )
 const maximizeWindowSetting = ref(instance.value.maximize_window ?? globalSettings.maximize_window)
+const windowTitle = ref(instance.value.window_title ?? '')
 
 const editInstanceObject = computed(() => {
+	const title = windowTitle.value.trim() ? windowTitle.value.trim() : null
 	if (!overrideWindowSettings.value) {
 		return {
 			force_fullscreen: null,
 			maximize_window: null,
 			game_resolution: null,
+			// The title is independent of the window-size override checkbox.
+			window_title: title,
 		}
 	}
 	return {
 		force_fullscreen: fullscreenSetting.value,
 		maximize_window: maximizeWindowSetting.value,
 		game_resolution: fullscreenSetting.value ? null : resolution.value,
+		window_title: title,
 	}
 })
 
 watch(
-	[overrideWindowSettings, resolution, fullscreenSetting, maximizeWindowSetting],
+	[overrideWindowSettings, resolution, fullscreenSetting, maximizeWindowSetting, windowTitle],
 	async () => {
 		await edit(instance.value.id, editInstanceObject.value)
 	},
@@ -109,6 +114,18 @@ const messages = defineMessages({
 		id: 'instance.settings.tabs.window.height.enter',
 		defaultMessage: 'Enter height...',
 	},
+	windowTitle: {
+		id: 'instance.settings.tabs.window.window-title',
+		defaultMessage: 'Window title',
+	},
+	windowTitleDescription: {
+		id: 'instance.settings.tabs.window.window-title.description',
+		defaultMessage: 'Customize the Minecraft window title. Leave empty to keep the default.',
+	},
+	enterWindowTitle: {
+		id: 'instance.settings.tabs.window.window-title.enter',
+		defaultMessage: 'Enter window title...',
+	},
 })
 </script>
 
@@ -200,5 +217,25 @@ const messages = defineMessages({
 				:placeholder="formatMessage(messages.enterHeight)"
 			/>
 		</div>
+		<div
+			v-if="globalSettings.custom_window_title_enabled"
+			class="flex items-center gap-4 justify-between"
+		>
+			<div class="flex flex-col gap-1">
+				<h2 class="m-0 inline-flex items-center gap-2 text-lg font-semibold text-contrast">
+					{{ formatMessage(messages.windowTitle) }}
+				</h2>
+				<p class="m-0">
+					{{ formatMessage(messages.windowTitleDescription) }}
+				</p>
+			</div>
+			<StyledInput
+				id="window-title"
+				v-model="windowTitle"
+				autocomplete="off"
+				type="text"
+				:placeholder="formatMessage(messages.enterWindowTitle)"
+			/>
+		</div>
 	</div>
 </template>

apps/app-frontend/src/components/ui/settings/DefaultInstanceSettings.vue

@@ -38,6 +38,26 @@ const messages = defineMessages({
 		id: 'app.settings.defaults.maximize-window.unsupported',
 		defaultMessage: 'Not supported on this operating system.',
 	},
+	windowTitleEnabled: {
+		id: 'app.settings.defaults.window-title.enabled',
+		defaultMessage: 'Custom Minecraft window title',
+	},
+	windowTitleEnabledDescription: {
+		id: 'app.settings.defaults.window-title.enabled-description',
+		defaultMessage: 'Allow instances to customize the Minecraft window title.',
+	},
+	defaultWindowTitle: {
+		id: 'app.settings.defaults.window-title.default',
+		defaultMessage: 'Default window title',
+	},
+	defaultWindowTitleDescription: {
+		id: 'app.settings.defaults.window-title.default-description',
+		defaultMessage: 'Used when an instance leaves its window title empty.',
+	},
+	defaultWindowTitlePlaceholder: {
+		id: 'app.settings.defaults.window-title.default-placeholder',
+		defaultMessage: 'Enter default window title...',
+	},
 	width: { id: 'app.settings.defaults.width', defaultMessage: 'Width' },
 	widthDescription: {
 		id: 'app.settings.defaults.width-description',
@@ -212,6 +232,36 @@ watch(
 					/>
 				</template>
 			</SettingsRow>
+			<SettingsRow>
+				<template #label>
+					<span id="settings-target-defaults-window-title" tabindex="-1">
+						{{ formatMessage(messages.windowTitleEnabled) }}
+					</span>
+				</template>
+				<template #description>{{
+					formatMessage(messages.windowTitleEnabledDescription)
+				}}</template>
+				<template #control>
+					<Toggle id="custom-window-title-enabled" v-model="settings.custom_window_title_enabled" />
+				</template>
+			</SettingsRow>
+			<SettingsRow stacked>
+				<template #label>{{ formatMessage(messages.defaultWindowTitle) }}</template>
+				<template #description>{{
+					formatMessage(messages.defaultWindowTitleDescription)
+				}}</template>
+				<template #control>
+					<StyledInput
+						id="default-window-title"
+						v-model="settings.default_window_title"
+						:disabled="!settings.custom_window_title_enabled"
+						autocomplete="off"
+						type="text"
+						:placeholder="formatMessage(messages.defaultWindowTitlePlaceholder)"
+						wrapper-class="w-full"
+					/>
+				</template>
+			</SettingsRow>
 		</SettingsSection>
 
 		<SettingsSection>

apps/app-frontend/src/helpers/types.d.ts

@@ -55,6 +55,7 @@ export type GameInstance = {
 	force_fullscreen?: boolean
 	maximize_window?: boolean
 	game_resolution?: [number, number]
+	window_title?: string | null
 	launch_preparation_timeout?: number | null
 	hooks: Hooks
 }
@@ -239,6 +240,8 @@ type AppSettings = {
 	force_fullscreen: boolean
 	maximize_window: boolean
 	game_resolution: [number, number]
+	custom_window_title_enabled: boolean
+	default_window_title: string
 	hide_on_process_start: boolean
 	enter_lightweight_mode_on_game_launch: boolean
 	auto_set_java_high_performance_mode: boolean

apps/app-frontend/src/locales/en-US/index.json

@@ -11431,5 +11431,29 @@
   },
   "app.anniversary.banner": {
     "message": "Happy {ordinal} Anniversary, Starlight!"
+  },
+  "instance.settings.tabs.window.window-title": {
+    "message": "Window title"
+  },
+  "instance.settings.tabs.window.window-title.description": {
+    "message": "Customize the Minecraft window title. Leave empty to keep the default."
+  },
+  "instance.settings.tabs.window.window-title.enter": {
+    "message": "Enter window title..."
+  },
+  "app.settings.defaults.window-title.enabled": {
+    "message": "Custom Minecraft window title"
+  },
+  "app.settings.defaults.window-title.enabled-description": {
+    "message": "Allow instances to customize the Minecraft window title."
+  },
+  "app.settings.defaults.window-title.default": {
+    "message": "Default window title"
+  },
+  "app.settings.defaults.window-title.default-description": {
+    "message": "Used when an instance does not provide its own title."
+  },
+  "app.settings.defaults.window-title.default-placeholder": {
+    "message": "Enter the default window title..."
   }
 }

apps/app-frontend/src/locales/zh-CN/index.json

@@ -11351,5 +11351,13 @@
 	"app.settings.synced-options.game-settings.value-off": { "message": "关闭" },
 	"app.settings.synced-options.game-settings.value-on": { "message": "开启" },
 	"app.settings.synced-options.game-settings.value-unset": { "message": "选择一个值" },
-	"app.anniversary.banner": { "message": "Starlight {ordinal} 周年快乐！" }
+	"app.anniversary.banner": { "message": "Starlight {ordinal} 周年快乐！" },
+	"instance.settings.tabs.window.window-title": { "message": "窗口标题" },
+	"instance.settings.tabs.window.window-title.description": { "message": "自定义 Minecraft 窗口标题。留空则使用默认标题。" },
+	"instance.settings.tabs.window.window-title.enter": { "message": "输入窗口标题..." },
+	"app.settings.defaults.window-title.enabled": { "message": "自定义 Minecraft 窗口标题" },
+	"app.settings.defaults.window-title.enabled-description": { "message": "允许实例自定义 Minecraft 窗口标题。" },
+	"app.settings.defaults.window-title.default": { "message": "默认窗口标题" },
+	"app.settings.defaults.window-title.default-description": { "message": "当实例未提供自己的标题时使用。" },
+	"app.settings.defaults.window-title.default-placeholder": { "message": "输入默认窗口标题..." }
 }

apps/app/src/lightweight_mode.rs

@@ -253,6 +253,14 @@ impl LightweightMode {
                     if payload.maximize_window {
                         maximize_minecraft_window(payload.pid).await;
                     }
+                    if let Some(title) = payload
+                        .window_title
+                        .as_ref()
+                        .map(|value| value.trim())
+                        .filter(|value| !value.is_empty())
+                    {
+                        rename_minecraft_window(payload.pid, title).await;
+                    }
                     let settings = match theseus::settings::get().await {
                         Ok(settings) => settings,
                         Err(error) => {
@@ -332,6 +340,8 @@ struct ProcessEventPayload {
     pid: u32,
     #[serde(default)]
     maximize_window: bool,
+    #[serde(default)]
+    window_title: Option<String>,
     event: String,
     crashed: Option<bool>,
     #[serde(default)]
@@ -339,7 +349,7 @@ struct ProcessEventPayload {
 }
 
 #[cfg(target_os = "windows")]
-use std::sync::atomic::{AtomicBool, AtomicU32, Ordering};
+use std::sync::atomic::{AtomicBool, AtomicIsize, AtomicU32, Ordering};
 
 #[cfg(target_os = "windows")]
 static MAXIMIZE_PROCESS_ID: AtomicU32 = AtomicU32::new(0);
@@ -400,6 +410,74 @@ async fn maximize_minecraft_window(pid: u32) {
 
 #[cfg(not(target_os = "windows"))]
 async fn maximize_minecraft_window(_pid: u32) {}
+#[cfg(target_os = "windows")]
+static RENAME_WINDOW_HANDLE: AtomicIsize = AtomicIsize::new(0);
+
+#[cfg(target_os = "windows")]
+unsafe extern "system" fn rename_if_owned_by_process(
+    hwnd: windows::Win32::Foundation::HWND,
+    _: windows::Win32::Foundation::LPARAM,
+) -> windows::core::BOOL {
+    use windows::Win32::UI::WindowsAndMessaging::{
+        GetWindowThreadProcessId, IsWindowVisible,
+    };
+    use windows::core::BOOL;
+
+    let mut window_pid = 0;
+    unsafe { GetWindowThreadProcessId(hwnd, Some(&mut window_pid)) };
+    if window_pid == MAXIMIZE_PROCESS_ID.load(Ordering::Relaxed)
+        && unsafe { IsWindowVisible(hwnd).as_bool() }
+    {
+        RENAME_WINDOW_HANDLE.store(hwnd.0 as isize, Ordering::Relaxed);
+        return BOOL(0);
+    }
+    BOOL(1)
+}
+
+#[cfg(target_os = "windows")]
+async fn rename_minecraft_window(pid: u32, title: &str) {
+    if pid == 0 || title.is_empty() {
+        return;
+    }
+
+    // PCL keeps re-applying the title: FML/Quilt and some mods reset it
+    // while the game boots, so a one-shot rename is not enough.
+    let deadline =
+        tokio::time::Instant::now() + std::time::Duration::from_secs(45);
+    let mut applied = false;
+    loop {
+        let found = {
+            let _guard = MAXIMIZE_WINDOW_ENUMERATION.lock();
+            MAXIMIZE_PROCESS_ID.store(pid, Ordering::Relaxed);
+            RENAME_WINDOW_HANDLE.store(0, Ordering::Relaxed);
+            unsafe {
+                use windows::Win32::Foundation::LPARAM;
+                use windows::Win32::UI::WindowsAndMessaging::EnumWindows;
+                let _ = EnumWindows(Some(rename_if_owned_by_process), LPARAM(0));
+            }
+            RENAME_WINDOW_HANDLE.load(Ordering::Relaxed)
+        };
+        if found != 0 {
+            let hwnd = windows::Win32::Foundation::HWND(found as *mut _);
+            let wide: Vec<u16> = title.encode_utf16().chain(Some(0)).collect();
+            unsafe {
+                use windows::Win32::UI::WindowsAndMessaging::SetWindowTextW;
+                let _ =
+                    SetWindowTextW(hwnd, windows::core::PCWSTR(wide.as_ptr()));
+            }
+            applied = true;
+        }
+        if tokio::time::Instant::now() >= deadline {
+            return;
+        }
+        let _ = applied;
+        tokio::time::sleep(std::time::Duration::from_millis(400)).await;
+    }
+}
+
+#[cfg(not(target_os = "windows"))]
+async fn rename_minecraft_window(_pid: u32, _title: &str) {}
+
 
 #[tauri::command]
 pub fn lightweight_mode_frontend_ready(