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Summary

Window manager (WM) is a system program that controls the position and decorations of windows in systems that use graphical interface. Common operations provided by window managers are: opening, closing, minizing, maximizing, moving, resizing, tracing of windows and decorations managing.

Many window managers are also equipped with utilities and practical software, such as docker, task bar, program launcher, desktop icons and wallpapers.

Types of window manager

Window managers can be categorized into three types according to their ways of painting and refreshing windows.

Mixed

It creates and draws all windows seperately, then composing them to a integral look in 2D or 3D environment. It is also the most advanced type.

Typical mixed WMs are:

  • Compiz: Mixed WM based on OpenGL used in Unity and many other desktop environments (DEs)
  • KWin: Another mixed WM based on OpenGL used in KDE

Tiled

It organizes the screen in a way that windows are not overlapped. In contrast to traditional organizing method, it tries to simulate the style of desk where things (windows) are placed according to their coordinates.

Typical tiled WMs are:

  • I3
  • Xmonad

Cascade

The window manager that allows overlapping and cascading of windows.

Typical cascade WMs are:

  • E17: A window manger that costs lots of time to develop; powerful as a desktop environment
  • Openbox: A highly customizable window manager of the next generation
  • Fvwm: Full featured window manager with minimum memory usage
  • Fluxbox: Lightweight window manager

References

维基百科:窗口管理器