electron-overlay-window

Library for creating overlay windows, intended to complement the Electron.

Responsible for:

• Finding target window by title
• Making overlay window a child of target
• Keeping position and size of overlay window with target in sync
• Emits lifecycle events

Important notes:

• You can initialize library only once (overlay window must never die, and title by which target window is searched cannot be changed)
• You can have only one overlay window
• Found target window remains "valid" even if its title has changed
• Correct behavior is guaranteed only for top-level windows (A top-level window is a window that is not a child window, or has no parent window (which is the same as having the "desktop window" as a parent))
• Windows: target window must have the same or lower privilege level than overlay window
• X11: library relies on EWHM, more specifically _NET_ACTIVE_WINDOW, _NET_WM_STATE_FULLSCREEN, _NET_WM_NAME

Supported backends:

• Windows (7 - 10)
• Linux (X11)

Recommended dev utils

• Windows: AccEvent (accevent.exe) and Inspect Object (inspect.exe) from Windows SDK
• X11: xwininfo, xprop, xev