GetWindow() creates a new instance of an already existing editorwindow

Questions & Answers
1

Hello there, I’m writing an editorwindow for unity but when I call:

CutSceneEditor window = (CutSceneEditor)EditorWindow.GetWindow(typeof(CutSceneEditor));

If the window is docked it will create a new instance of this window rather than bringing it to focus…this does not happen if the window is un-docked…any ideas why?

cheers

3

Still an issue.
In our case we open an internal unitypackage all the time and open the required EditorWindow by menu. To automate this, I tried this:

[InitializeOnLoad]
public class Startup
{
	static Startup()
	{
		MyWindow window = EditorWindow.GetWindow<MyWindow>();
		window.Show();
	}
}

But on the next script reload the Editor doesn’t know about the already existing window and opens another one. Looks like an initialization issue of the editor.
Next thing i realized: The window even opens just by calling GetWindow.
So the documentation is absolute wong in this case.

I solved this with a custom singleton:

[InitializeOnLoad]
public class Startup
{
	static Startup()
	{
		MyWindow.ShowWindow();
	}
}

public class MyWindow : EditorWindow
{
	// Singleton to avoid multiple instances of window. 
	private static MyWindow instance = null;

	// Set instance on reloading the window, else it gets lost after script reload (due to PlayMode changes, ...).
	public MyWindow()
	{
		instance = this;
	}

	[MenuItem("Window/MyWindow")]
	public static void ShowWindow()
	{
		if (instance == null)
		{
			// "Get existing open window or if none, make a new one:" says documentation.
			// But if called after script reloads a second instance will be opened! => Custom singleton required.
			MyWindow window = EditorWindow.GetWindow<MyWindow>();
			window.titleContent = new GUIContent("My Title");
			instance = window;
			window.Show();
		}
		else
			instance.Focus();
	}
}
2

I don’t completely understand your problem, but you could try to just use the Focus method of an EditorWindow.