window_manager #

This plugin allows Flutter desktop apps to resizing and repositioning the window.

Platform Support
Quick Start
- Installation
- Usage
Articles
Who's using it?
API
- WindowManager
  - Methods
- WindowListener
  - Methods
License

Platform Support #

Linux	macOS	Windows
✔️	✔️	✔️

Quick Start #

Installation #

Add this to your package's pubspec.yaml file:

dependencies:
  window_manager: ^0.3.3

dependencies:
  window_manager:
    git:
      url: https://github.com/leanflutter/window_manager.git
      ref: main

Usage #

import 'package:flutter/material.dart';
import 'package:window_manager/window_manager.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  // Must add this line.
  await windowManager.ensureInitialized();

  WindowOptions windowOptions = WindowOptions(
    size: Size(800, 600),
    center: true,
    backgroundColor: Colors.transparent,
    skipTaskbar: false,
    titleBarStyle: TitleBarStyle.hidden,
  );
  windowManager.waitUntilReadyToShow(windowOptions, () async {
    await windowManager.show();
    await windowManager.focus();
  });

  runApp(MyApp());
}

Please see the example app of this plugin for a full example.

Listening events

import 'package:flutter/cupertino.dart';
import 'package:window_manager/window_manager.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> with WindowListener {
  @override
  void initState() {
    super.initState();
    windowManager.addListener(this);
  }

  @override
  void dispose() {
    windowManager.removeListener(this);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    // ...
  }

  @override
  void onWindowEvent(String eventName) {
    print('[WindowManager] onWindowEvent: $eventName');
  }

  @override
  void onWindowClose() {
    // do something
  }

  @override
  void onWindowFocus() {
    // do something
  }

  @override
  void onWindowBlur() {
    // do something
  }

  @override
  void onWindowMaximize() {
    // do something
  }

  @override
  void onWindowUnmaximize() {
    // do something
  }

  @override
  void onWindowMinimize() {
    // do something
  }

  @override
  void onWindowRestore() {
    // do something
  }

  @override
  void onWindowResize() {
    // do something
  }

  @override
  void onWindowMove() {
    // do something
  }

  @override
  void onWindowEnterFullScreen() {
    // do something
  }

  @override
  void onWindowLeaveFullScreen() {
    // do something
  }
}

Quit on close

If you need to use the hide method, you need to disable QuitOnClose.

macOS

Change the file macos/Runner/AppDelegate.swift as follows:

import Cocoa
import FlutterMacOS

@NSApplicationMain
class AppDelegate: FlutterAppDelegate {
  override func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
-    return true
+    return false
  }
}

Confirm before closing

import 'package:flutter/cupertino.dart';
import 'package:window_manager/window_manager.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> with WindowListener {
  @override
  void initState() {
    super.initState();
    windowManager.addListener(this);
    _init();
  }

  @override
  void dispose() {
    windowManager.removeListener(this);
    super.dispose();
  }

  void _init() async {
    // Add this line to override the default close handler
    await windowManager.setPreventClose(true);
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    // ...
  }

  @override
  void onWindowClose() async {
    bool _isPreventClose = await windowManager.isPreventClose();
    if (_isPreventClose) {
      showDialog(
        context: context,
        builder: (_) {
          return AlertDialog(
            title: Text('Are you sure you want to close this window?'),
            actions: [
              TextButton(
                child: Text('No'),
                onPressed: () {
                  Navigator.of(context).pop();
                },
              ),
              TextButton(
                child: Text('Yes'),
                onPressed: () {
                  Navigator.of(context).pop();
                  await windowManager.destroy();
                },
              ),
            ],
          );
        },
      );
    }
  }
}

Hidden at launch

Linux

Change the file linux/my_application.cc as follows:


...

// Implements GApplication::activate.
static void my_application_activate(GApplication* application) {
  
  ...

  gtk_window_set_default_size(window, 1280, 720);
-  gtk_widget_show(GTK_WIDGET(window));
+  gtk_widget_realize(GTK_WIDGET(window));

  g_autoptr(FlDartProject) project = fl_dart_project_new();
  fl_dart_project_set_dart_entrypoint_arguments(project, self->dart_entrypoint_arguments);

  FlView* view = fl_view_new(project);
  gtk_widget_show(GTK_WIDGET(view));
  gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));

  fl_register_plugins(FL_PLUGIN_REGISTRY(view));

  gtk_widget_grab_focus(GTK_WIDGET(view));
}

...

macOS

Change the file macos/Runner/MainFlutterWindow.swift as follows:

import Cocoa
import FlutterMacOS
+import window_manager

class MainFlutterWindow: NSWindow {
    override func awakeFromNib() {
        let flutterViewController = FlutterViewController.init()
        let windowFrame = self.frame
        self.contentViewController = flutterViewController
        self.setFrame(windowFrame, display: true)

        RegisterGeneratedPlugins(registry: flutterViewController)

        super.awakeFromNib()
    }

+    override public func order(_ place: NSWindow.OrderingMode, relativeTo otherWin: Int) {
+        super.order(place, relativeTo: otherWin)
+        hiddenWindowAtLaunch()
+    }
}

Windows

Change the file windows/runner/win32_window.cpp as follows:

bool Win32Window::CreateAndShow(const std::wstring& title,
                                const Point& origin,
                                const Size& size) {
  ...                              
  HWND window = CreateWindow(
-      window_class, title.c_str(), WS_OVERLAPPEDWINDOW | WS_VISIBLE,
+      window_class, title.c_str(),
+      WS_OVERLAPPEDWINDOW, // do not add WS_VISIBLE since the window will be shown later
      Scale(origin.x, scale_factor), Scale(origin.y, scale_factor),
      Scale(size.width, scale_factor), Scale(size.height, scale_factor),
      nullptr, nullptr, GetModuleHandle(nullptr), this);

Since flutter 3.7 new windows project Change the file windows/runner/flutter_window.cpp as follows:

bool FlutterWindow::OnCreate() {
  ...
  flutter_controller_->engine()->SetNextFrameCallback([&]() {
-   this->Show();
+   "" //delete this->Show()
  });

Make sure to call setState once on the onWindowFocus event.

import 'package:flutter/cupertino.dart';
import 'package:window_manager/window_manager.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> with WindowListener {
  @override
  void initState() {
    super.initState();
    windowManager.addListener(this);
  }

  @override
  void dispose() {
    windowManager.removeListener(this);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    // ...
  }

  @override
  void onWindowFocus() {
    // Make sure to call once.
    setState(() {});
    // do something
  }
}

Articles #

Who's using it? #

AuthPass - Password Manager based on Flutter for all platforms. Keepass 2.x (kdbx 3.x) compatible.
Biyi (比译) - A convenient translation and dictionary app written in dart / Flutter.
BlueBubbles - BlueBubbles is an ecosystem of apps bringing iMessage to Android, Windows, and Linux
LunaSea - A self-hosted controller for mobile and macOS built using the Flutter framework.
Linwood Butterfly - Open source note taking app written in Flutter
RustDesk - Yet another remote desktop software, written in Rust. Works out of the box, no configuration required.
Ubuntu Desktop Installer - This project is a modern implementation of the Ubuntu Desktop installer.

API #

WindowManager #

Methods

waitUntilReadyToShow

Wait until ready to show.

destroy

Force closing the window.

close

Try to close the window.

isPreventClose

Check if is intercepting the native close signal.

setPreventClose

Set if intercept the native close signal. May useful when combine with the onclose event listener. This will also prevent the manually triggered close event.

focus

Focuses on the window.

blur `macos` `windows`

Removes focus from the window.

isFocused `macos` `windows`

Returns bool - Whether window is focused.

show

Shows and gives focus to the window.

hide

Hides the window.

isVisible

Returns bool - Whether the window is visible to the user.

isMaximized

Returns bool - Whether the window is maximized.

maximize

Maximizes the window. vertically simulates aero snap, only works on Windows

unmaximize

Unmaximizes the window.

isMinimized

Returns bool - Whether the window is minimized.

minimize

Minimizes the window. On some platforms the minimized window will be shown in the Dock.

restore

Restores the window from minimized state to its previous state.

isFullScreen

Returns bool - Whether the window is in fullscreen mode.

setFullScreen

Sets whether the window should be in fullscreen mode.

setAspectRatio

This will make a window maintain an aspect ratio.

setBackgroundColor

Sets the background color of the window.

setAlignment

Move the window to a position aligned with the screen.

center

Moves window to the center of the screen.

getBounds

Returns Rect - The bounds of the window as Object.

setBounds

Resizes and moves the window to the supplied bounds.

getSize

Returns Size - Contains the window's width and height.

setSize

Resizes the window to width and height.

getPosition

Returns Offset - Contains the window's current position.

setPosition

Moves window to position.

setMinimumSize

Sets the minimum size of window to width and height.

setMaximumSize

Sets the maximum size of window to width and height.

isResizable

Returns bool - Whether the window can be manually resized by the user.

setResizable

Sets whether the window can be manually resized by the user.

isMovable `macos`

Returns bool - Whether the window can be moved by user.

setMovable `macos`

Sets whether the window can be moved by user.

isMinimizable `macos` `windows`

Returns bool - Whether the window can be manually minimized by the user.

setMinimizable `macos` `windows`

Sets whether the window can be manually minimized by user.

isClosable `windows`

Returns bool - Whether the window can be manually closed by user.

isMaximizable `windows`

Returns bool - Whether the window can be manually maximized by the user.

setMaximizable

Sets whether the window can be manually maximized by the user.

setClosable `macos` `windows`

Sets whether the window can be manually closed by user.

isAlwaysOnTop

Returns bool - Whether the window is always on top of other windows.

setAlwaysOnTop

Sets whether the window should show always on top of other windows.

isAlwaysOnBottom

Returns bool - Whether the window is always below other windows.

setAlwaysOnBottom `linux` `windows`

Sets whether the window should show always below other windows.

getTitle

Returns String - The title of the native window.

setTitle

Changes the title of native window to title.

setTitleBarStyle

Changes the title bar style of native window.

getTitleBarHeight

Returns int - The title bar height of the native window.

isSkipTaskbar

Returns bool - Whether skipping taskbar is enabled.

setSkipTaskbar

Makes the window not show in the taskbar / dock.

setProgressBar `macos` `windows`

Sets progress value in progress bar. Valid range is [0, 1.0].

setIcon `windows`

Sets window/taskbar icon.

isVisibleOnAllWorkspaces `macos`

Returns bool - Whether the window is visible on all workspaces.

setVisibleOnAllWorkspaces `macos`

Sets whether the window should be visible on all workspaces.

Note: If you need to support dragging a window on top of a fullscreen window on another screen, you need to modify MainFlutterWindow to inherit from NSPanel

class MainFlutterWindow: NSPanel {
// ...
}

setBadgeLabel `macos`

Set/unset label on taskbar(dock) app icon

Note that it's required to request access at your AppDelegate.swift like this: UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge])

hasShadow `macos` `windows`

Returns bool - Whether the window has a shadow. On Windows, always returns true unless window is frameless.

setHasShadow `macos` `windows`

Sets whether the window should have a shadow. On Windows, doesn't do anything unless window is frameless.

getOpacity

Returns double - between 0.0 (fully transparent) and 1.0 (fully opaque).

setOpacity

Sets the opacity of the window.

setBrightness

Sets the brightness of the window.

setIgnoreMouseEvents

Makes the window ignore all mouse events.

All mouse events happened in this window will be passed to the window below this window, but if this window has focus, it will still receive keyboard events.

startDragging

Starts a window drag based on the specified mouse-down event.

startResizing `linux` `windows`

Starts a window resize based on the specified mouse-down & mouse-move event.

grabKeyboard `linux`

Grabs the keyboard.

ungrabKeyboard `linux`

Ungrabs the keyboard.

WindowListener #

Methods

onWindowClose

Emitted when the window is going to be closed.

onWindowFocus

Emitted when the window gains focus.

onWindowBlur

Emitted when the window loses focus.

onWindowMaximize

Emitted when window is maximized.

onWindowUnmaximize

Emitted when the window exits from a maximized state.

onWindowMinimize

Emitted when the window is minimized.

onWindowRestore

Emitted when the window is restored from a minimized state.

onWindowResize

Emitted after the window has been resized.

onWindowResized `macos` `windows`

Emitted once when the window has finished being resized.

onWindowMove

Emitted when the window is being moved to a new position.

onWindowMoved `macos` `windows`

Emitted once when the window is moved to a new position.

onWindowEnterFullScreen

Emitted when the window enters a full-screen state.

onWindowLeaveFullScreen

Emitted when the window leaves a full-screen state.

onWindowEvent

Emitted all events.

Contributors #

_LiJianying 💻	_{A Arif A S} 💻	_{J-P Nurmi} 💻	_Dixeran 💻	_nikitatg 💻	_{Kristen McWilliam} 💻	_Kingtous 💻
_Prome 💻	_Bin 💻	_youxiachai 💻	_{Allen Xu} 💻	_CodeDoctor 💻	_{Jean-Christophe Binet} 💻	_{Jon Salmon} 💻
_{Karol Wrótniak} 💻	_LAIIIHZ 💻	_{Mikhail Kulesh} 💻	_{Prateek Sunal} 💻	_{Ricardo Boss} 💻
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