Live in the system tray instead of the taskbar, bump to 0.1.14

- A tray icon (the app icon) is there for as long as wIRC runs. Left click hides
  or shows every wIRC window; right click has Show wIRC, Hide wIRC and Exit. Exit
  disconnects every server and quits.
- No wIRC window has a taskbar button. Each window is given a hidden owner window
  through JNA, because Window.Type.UTILITY can't be set after Compose builds the
  window and would take wIRC main's minimize button away.
- Minimizing any window hides all of them to the tray. Showing them again puts
  each one back where it was. Hidden windows stay connected and keep filling their
  buffers. Closing a window with X works the same as before.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
 }
 
 group = "com.tpuahsiew.wirc"
-version = "0.1.13"
+version = "0.1.14"
 
 // No project-level repositories{} block here: settings.gradle.kts sets
 // dependencyResolutionManagement.repositoriesMode = FAIL_ON_PROJECT_REPOS and already
@@ -22,6 +22,8 @@ dependencies {
     implementation(compose.materialIconsExtended)
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-swing:1.8.1")
     implementation("org.json:json:20240303")
+    // Native Windows calls that keep wIRC's windows off the taskbar (see AppTray.kt)
+    implementation("net.java.dev.jna:jna-platform:5.14.0")
 }
 
 kotlin {
@@ -38,7 +40,7 @@ compose.desktop {
             appResourcesRootDir.set(project.file("installerResources"))
             targetFormats(TargetFormat.Msi, TargetFormat.Exe)
             packageName = "wIRC"
-            packageVersion = "0.1.13"
+            packageVersion = "0.1.14"
             windows {
                 menuGroup = "wIRC"
                 upgradeUuid = "8f14e45f-ceea-4a5e-9c3b-5b1f0e8c2b7a"

src/main/kotlin/Main.kt

@@ -23,6 +23,7 @@ import data.storageId
 import irc.ConnectionManager
 import ui.ChannelWindow
 import ui.MainScreen
+import ui.TrayWindowBehavior
 import ui.rememberPersistentWindowState
 import java.io.File
 
@@ -91,18 +92,34 @@ fun main() = application {
     val mainLineGap = ui.rememberLineGap()
     ui.WindowSnapping(mainWindowState, mainLineGap, osFrame = true)
 
-    // There's no persistent tray/notification surface on this build, so closing the main
-    // server-list window quits the whole app (and every channel window with it) - the
-    // same "closing the primary window ends the session" convention most desktop chat
-    // apps without a tray icon follow.
+    // wIRC lives in the tray: no window is on the taskbar, and minimizing any window hides
+    // all of them (see TrayWindowBehavior). Hidden windows stay composed and connected, so
+    // nothing is lost while they're away; showing them again puts each back where it was.
+    // A window opened while hidden (e.g. a new PM) stays hidden until they're shown.
+    var windowsShown by remember { mutableStateOf(true) }
+    val hideAll: () -> Unit = { windowsShown = false }
+    val mainTitle = if (mainUnread > 0) "wIRC - Main ($mainUnread new)" else "wIRC - Main"
+
+    ui.AppTray(
+        // The unread count shows on the tray icon's tooltip too, so new server messages
+        // are visible even when the windows are hidden.
+        tooltip = if (mainUnread > 0) "wIRC ($mainUnread new)" else "wIRC",
+        onToggle = { windowsShown = !windowsShown },
+        onShow = { windowsShown = true },
+        onHide = hideAll,
+        onExit = shutdownApp
+    )
+
+    // Closing the main server-list window quits the whole app (and every channel window
+    // with it) - the tray's Exit does the same, and also disconnects first.
     Window(
         onCloseRequest = ::exitApplication,
-        // The unread count shows in the taskbar too, so new server messages are visible
-        // even when the main window is behind other windows.
-        title = if (mainUnread > 0) "wIRC - Main ($mainUnread new)" else "wIRC - Main",
+        visible = windowsShown,
+        title = mainTitle,
         icon = painterResource("icon.png"),
         state = mainWindowState
     ) {
+        TrayWindowBehavior(mainWindowState, hideAll)
         androidx.compose.runtime.CompositionLocalProvider(ui.LocalLineGap provides mainLineGap) {
         MaterialTheme(colorScheme = neutralDarkScheme) {
             Surface {
@@ -128,6 +145,8 @@ fun main() = application {
                 bufferKey = bufferKey,
                 prefsRepo = prefsRepo,
                 colorScheme = neutralDarkScheme,
+                visible = windowsShown,
+                onHideAll = hideAll,
                 onOpenBuffer = { newKey -> openBuffers = openBuffers + newKey },
                 onCloseSelf = { openBuffers = openBuffers - bufferKey },
                 // openBuffers is read when /quit runs, so every window open at that moment

src/main/kotlin/ui/AppTray.kt

@@ -0,0 +1,126 @@
+package ui
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
+import androidx.compose.runtime.snapshotFlow
+import androidx.compose.ui.awt.ComposeWindow
+import androidx.compose.ui.window.FrameWindowScope
+import androidx.compose.ui.window.WindowState
+import com.sun.jna.Native
+import com.sun.jna.Pointer
+import com.sun.jna.platform.win32.User32
+import com.sun.jna.platform.win32.WinDef
+import com.sun.jna.platform.win32.WinUser
+import java.awt.Frame
+import java.awt.MenuItem
+import java.awt.PopupMenu
+import java.awt.SystemTray
+import java.awt.TrayIcon
+import java.awt.event.MouseAdapter
+import java.awt.event.MouseEvent
+import javax.imageio.ImageIO
+
+/**
+ * wIRC's icon in the Windows notification area, there for as long as the app runs. wIRC
+ * windows never show on the taskbar (see [hideFromTaskbar]), so this is how they come back
+ * after being hidden. Left click toggles all windows; right click opens Show / Hide / Exit.
+ * Plain AWT instead of Compose's Tray, because Compose's Tray only reports a double click.
+ */
+@Composable
+fun AppTray(
+    tooltip: String,
+    onToggle: () -> Unit,
+    onShow: () -> Unit,
+    onHide: () -> Unit,
+    onExit: () -> Unit
+) {
+    val currentToggle by rememberUpdatedState(onToggle)
+    val currentShow by rememberUpdatedState(onShow)
+    val currentHide by rememberUpdatedState(onHide)
+    val currentExit by rememberUpdatedState(onExit)
+
+    val trayIcon = remember {
+        if (!SystemTray.isSupported()) return@remember null
+        val image = Thread.currentThread().contextClassLoader.getResourceAsStream("icon.png")?.use { ImageIO.read(it) }
+            ?: return@remember null
+        val menu = PopupMenu().apply {
+            add(MenuItem("Show wIRC").apply { addActionListener { currentShow() } })
+            add(MenuItem("Hide wIRC").apply { addActionListener { currentHide() } })
+            addSeparator()
+            add(MenuItem("Exit").apply { addActionListener { currentExit() } })
+        }
+        TrayIcon(image, tooltip, menu).apply {
+            isImageAutoSize = true
+            addMouseListener(object : MouseAdapter() {
+                override fun mouseClicked(e: MouseEvent) {
+                    if (e.button == MouseEvent.BUTTON1) currentToggle()
+                }
+            })
+        }
+    }
+
+    DisposableEffect(trayIcon) {
+        trayIcon?.let { runCatching { SystemTray.getSystemTray().add(it) } }
+        onDispose { trayIcon?.let { SystemTray.getSystemTray().remove(it) } }
+    }
+    LaunchedEffect(trayIcon, tooltip) { trayIcon?.toolTip = tooltip }
+}
+
+/**
+ * Called first thing inside every wIRC Window's content:
+ *  - Keeps the window off the taskbar (see [hideFromTaskbar]).
+ *  - Turns a minimize (the title-bar button, Win+D, etc.) into hiding every wIRC window to
+ *    the tray: with no taskbar button, a minimized window would have no way back.
+ */
+@Composable
+fun FrameWindowScope.TrayWindowBehavior(state: WindowState, onHideAll: () -> Unit) {
+    remember(window) { hideFromTaskbar(window) }
+    val currentHideAll by rememberUpdatedState(onHideAll)
+    LaunchedEffect(state) {
+        snapshotFlow { state.isMinimized }.collect { minimized ->
+            if (minimized) {
+                currentHideAll()
+                // Hidden before it's un-minimized, so it doesn't flash back up on the way
+                window.isVisible = false
+                state.isMinimized = false
+            }
+        }
+    }
+}
+
+/**
+ * Windows gives a taskbar button only to windows that have no owner, so every wIRC window is
+ * given one: a window that's never shown. Done natively because Window.Type.UTILITY (AWT's
+ * own way off the taskbar) can only be set before Compose has built the window, and on a
+ * framed window like wIRC main it also swaps in a small tool-window title bar with no
+ * minimize button. Runs while the window is built but not yet shown, which is when the
+ * taskbar decides whether it gets a button.
+ */
+fun hideFromTaskbar(window: ComposeWindow) {
+    try {
+        val hwnd = WinDef.HWND(Pointer(window.windowHandle))
+        val user32 = User32.INSTANCE
+        user32.SetWindowLongPtr(hwnd, GWLP_HWNDPARENT, TaskbarOwner.hwnd.pointer)
+        val exStyle = user32.GetWindowLong(hwnd, WinUser.GWL_EXSTYLE)
+        if (exStyle and WS_EX_APPWINDOW != 0) {
+            user32.SetWindowLong(hwnd, WinUser.GWL_EXSTYLE, exStyle and WS_EX_APPWINDOW.inv())
+        }
+    } catch (e: Throwable) {
+        // Not on Windows, or no native access: the window just keeps its taskbar button
+    }
+}
+
+private const val GWLP_HWNDPARENT = -8
+private const val WS_EX_APPWINDOW = 0x00040000
+
+private object TaskbarOwner {
+    val hwnd: WinDef.HWND by lazy {
+        // Made displayable (so it has a native window) but never shown
+        val frame = Frame().apply { addNotify() }
+        WinDef.HWND(Native.getComponentPointer(frame))
+    }
+}

src/main/kotlin/ui/ChannelScreen.kt

@@ -79,7 +79,6 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.window.DialogWindow
 import androidx.compose.ui.window.WindowScope
-import androidx.compose.ui.window.WindowState
 import androidx.compose.ui.window.rememberDialogState
 import data.ChannelBuffer
 import data.ChannelUser
@@ -184,7 +183,7 @@ private fun copyToClipboardSafely(scope: CoroutineScope, text: String) {
 @OptIn(ExperimentalMaterial3Api::class, androidx.compose.foundation.ExperimentalFoundationApi::class)
 @Composable
 fun WindowScope.ChannelScreen(
-    windowState: WindowState,
+    onMinimize: () -> Unit,
     onCloseWindow: () -> Unit,
     channelName: String,
     buffer: ChannelBuffer?,
@@ -383,7 +382,7 @@ fun WindowScope.ChannelScreen(
                         FadingTitleBarButton(onClick = { showSettings = !showSettings }) {
                             Icon(Icons.Default.Settings, contentDescription = "Window settings", tint = textColor, modifier = Modifier.size(16.dp))
                         }
-                        FadingTitleBarButton(onClick = { windowState.isMinimized = true }) {
+                        FadingTitleBarButton(onClick = onMinimize) {
                             Box(
                                 modifier = Modifier
                                     .size(width = 10.dp, height = 2.dp)

src/main/kotlin/ui/ChannelWindow.kt

@@ -46,6 +46,8 @@ fun ChannelWindow(
     bufferKey: BufferKey,
     prefsRepo: WindowPrefsRepository,
     colorScheme: ColorScheme,
+    visible: Boolean,
+    onHideAll: () -> Unit,
     onOpenBuffer: (BufferKey) -> Unit,
     onCloseSelf: () -> Unit,
     onDisconnectServer: () -> Unit
@@ -84,8 +86,11 @@ fun ChannelWindow(
     // supplies its own title bar with minimize/close/drag/resize to make up for what the
     // OS chrome would otherwise provide. No Surface wrapper here (M3 Surface paints an
     // opaque background) - ChannelScreen already paints its own alpha-aware background.
+    // Hidden to the tray along with every other wIRC window when [visible] is false - the
+    // window and its composition stay alive, so its buffer keeps filling while hidden.
     Window(
         onCloseRequest = onCloseSelf,
+        visible = visible,
         title = windowTitle,
         icon = painterResource("icon.png"),
         state = windowState,
@@ -93,10 +98,11 @@ fun ChannelWindow(
         transparent = true,
         resizable = true
     ) {
+        TrayWindowBehavior(windowState, onHideAll)
         CompositionLocalProvider(LocalLineGap provides lineGap) {
         MaterialTheme(colorScheme = colorScheme) {
                 ChannelScreen(
-                    windowState = windowState,
+                    onMinimize = onHideAll,
                     onCloseWindow = onCloseSelf,
                     channelName = windowTitle,
                     buffer = buffer,