window+

Work in progress. API may change.

As it should be. Extend view into title-bar.

Setup

Following configuration is required.

macOS

 import Cocoa
 import FlutterMacOS
+import window_plus
 
 class MainFlutterWindow: NSWindow {
     override func awakeFromNib() {
        WindowPlusPlugin.handleSingleInstance()
 
         let flutterViewController = FlutterViewController()
         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)
+        WindowPlusPlugin.hideUntilReady()
+    }
 }

Windows

Edit windows/runner/win32_window.cpp as:

   HWND window = CreateWindow(
-      window_class, title.c_str(), WS_OVERLAPPEDWINDOW | WS_VISIBLE,
+      window_class, title.c_str(), WS_OVERLAPPEDWINDOW,
       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);

-    case WM_SIZE: {
-      RECT rect = GetClientArea();
-      if (child_content_ != nullptr) {
-        // Size and position the child window.
-        MoveWindow(child_content_, rect.left, rect.top, rect.right - rect.left,
-                   rect.bottom - rect.top, TRUE);
-      }
-      return 0;
-    }

     case WM_ACTIVATE:

Linux

Edit linux/my_application.cc as:

   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));
+  gtk_widget_hide(GTK_WIDGET(window));

Single Instance

For enabling single instance support, follow the steps below.

macOS

In macos/Runner/MainFlutterWindow.swift, add the following code:

 import Cocoa
 import FlutterMacOS
+import window_plus
 
 class MainFlutterWindow: NSWindow {
     override func awakeFromNib() {
+        WindowPlusPlugin.handleSingleInstance()
 
         let flutterViewController = FlutterViewController()
         let windowFrame = self.frame
         self.contentViewController = flutterViewController
         self.setFrame(windowFrame, display: true)
 
         RegisterGeneratedPlugins(registry: flutterViewController)
 
         super.awakeFromNib()
     }
 }

Windows

In windows/runner/main.cpp, add the following code:

  #include <flutter/dart_project.h>
  #include <flutter/flutter_view_controller.h>
  #include <windows.h>

  #include "flutter_window.h"
  #include "utils.h"
+ #include "window_plus/window_plus_plugin_c_api.h"

  int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
                        _In_ wchar_t* command_line, _In_ int show_command) {
+   ::WindowPlusPluginCApiHandleSingleInstance(NULL, NULL);

    // Attach to console when present (e.g., 'flutter run') or create a
    // new console when running with a debugger.
    if (!::AttachConsole(ATTACH_PARENT_PROCESS) && ::IsDebuggerPresent()) {
      CreateAndAttachConsole();
    }

If you use custom window class name, then you can pass it as the first argument instead of NULL. Similarly, if you want to also account for your window's title, then you can pass it as the second argument instead of NULL.

Linux

You need to edit your linux/my_application.cc file. See this file for reference.

Notice how G_APPLICATION_HANDLES_OPEN & G_APPLICATION_HANDLES_COMMAND_LINE are implemented.

Finally, forward the arguments to Dart / Flutter, with window_plus_plugin_handle_single_instance call at the required location.

Platforms

• macOS
• Windows
• GNU/Linux

License

MIT License

Copyright © 2022, Hitesh Kumar Saini saini123hitesh@gmail.com.

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