X Window System

叁歲伎倆 2022-05-18 04:24 258阅读 0赞

1. X Window System is a low-level protocol

•Create/destroy windows

•Move/resize windows

•Map/unmap windows (show/hide windows)

•Receive user inputs (key presses/releases, mouse events)

•Draw lines/curves/bitmaps

2. Window Manager

•Controls the general appearance of windows and other graphical elements of the GUI.

•Chooses the size and position of windows, placing the decorative border around them, handling icons, handling mouse click outside windows (on the “background”) or on window-frame, handling certain keystrokes (e.g., Alt-F4).

3. Window

•Window information

Some basic attributes describing the window, Includes id, title, coordinates, map state, override redirect state, etc.

xwininfo

•Window properties

Extensible window attributes which heavily used by Window Manager

Can also used to inter-client communication

E.g., Icon, maximization state, coordinates hint, pid, etc.

xprop

4. Xevent

•An XEvent is data generated asynchronously by the X server as a result of

Some device activity

Side effects of a request sent by the X client

•Event Categories

Keyboard events: KeyPress, KeyRelease

Mouse events: ButtonPress, ButtonRelease, MotionNotify

Window crossing events: EnterNotify, LeaveNotify

Input focus events: FocusIn, FocusOut

Keymap state notification event: KeymapNotify

Exposure events: Expose, GraphicsExpose, NoExpose

Structure control events: CirculateRequest, ConfigureRequest, MapRequest, ResizeRequest

Window state notification events: CirculateNotify, ConfigureNotify, CreateNotify…

Colormap state notification event: ColormapNotify

Client communication events: ClientMessage, PropertyNotify, SelectionClear…

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