NETWMSTATEMAXIMIZEDVERT

The NETWMSTATEMAXIMIZEDVERT property is an Extended Window Manager Hints (EWMH) specification element used in the X Window System to communicate window state information between client applications and window managers. Introduced as part of the EWMH standard, which extends the original ICCCM (Inter-Client Communication Conventions Manual), it allows window managers to handle window states such as maximization more effectively.

NETWMSTATEMAXIMIZEDVERT indicates that a window is maximized vertically, meaning it is stretched to fill the full height of the screen while maintaining its original width. This differs from horizontal maximization (NETWMSTATEMAXIMIZEDHORZ), where the window fills the screen width but retains its original height. The property is typically set by the window manager or a compositing manager (such as a desktop environment) to inform clients of the current window state.

The property is defined as an atom in the X Window System, where each bit in a 32-bit integer represents a distinct window state. For NETWMSTATEMAXIMIZEDVERT, the corresponding bit (bit 2, or 0x00000004) is set when the window is vertically maximized. Clients can query this property using the XGetWindowProperty function to determine whether a window is in a maximized vertical state.

This property is particularly useful in compositing window managers or desktop environments that support tiling or dynamic window resizing, as it enables applications to adjust their behavior accordingly. For example, a client application might choose to disable its own maximization logic if the window manager has already set this state. The EWMH specification ensures compatibility across different window managers and desktop environments by standardizing how window states are communicated.

While NETWMSTATEMAXIMIZEDVERT is widely supported in modern window managers, its usage depends on the specific implementation of the EWMH standard by the system. Some older or minimal window managers may not fully adhere to the specification, requiring manual checks or alternative methods for window state management.