Xlib â C Language X Interface

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<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFTtypedef struct {int type; /* ButtonPress or ButtonRelease */unsigned long serial; /* # of last request processed by server */Bool send_event; /* true if this came from a SendEvent request */Display *display; /* Display the event was read from */Window window; /* ‘‘event’’ window itisreported relative to */Window root; /* root window that the event occurred on */Window subwindow; /* child window */Time time; /* milliseconds */int x, y; /* pointer x, y coordinates in event window */int x_root, y_root; /* coordinates relative to root */unsigned int state; /* key or button mask */unsigned int button; /* detail */Bool same_screen; /* same screen flag */}XButtonEvent;typedef XButtonEvent XButtonPressedEvent;typedef XButtonEvent XButtonReleasedEvent;typedef struct {int type; /* KeyPress or KeyRelease */unsigned long serial; /* # of last request processed by server */Bool send_event; /* true if this came from a SendEvent request */Display *display; /* Display the event was read from */Window window; /* ‘‘event’’ window itisreported relative to */Window root; /* root window that the event occurred on */Window subwindow; /* child window */Time time; /* milliseconds */int x, y; /* pointer x, y coordinates in event window */int x_root, y_root; /* coordinates relative to root */unsigned int state; /* key or button mask */unsigned int keycode; /* detail */Bool same_screen; /* same screen flag */}XKeyEvent;typedef XKeyEvent XKeyPressedEvent;typedef XKeyEvent XKeyReleasedEvent;typedef struct {int type; /* MotionNotify */unsigned long serial; /* # of last request processed by server */Bool send_event; /* true if this came from a SendEvent request */Display *display; /* Display the event was read from */Window window; /* ‘‘event’’ window reported relative to */Window root; /* root window that the event occurred on */Window subwindow; /* child window */Time time; /* milliseconds */int x, y; /* pointer x, y coordinates in event window */int x_root, y_root; /* coordinates relative to root */unsigned int state; /* key or button mask */char is_hint; /* detail */205
<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFTBool same_screen; /* same screen flag */}XMotionEvent;typedef XMotionEvent XPointerMovedEvent;These structures have the following common members: window, root, subwindow, time, x, y,x_root, y_root, state, and same_screen. The window member is set to the window onwhich theevent was generated and is referred to as the event window. Aslong as the conditions previouslydiscussed are met, this is the window used by the X server to report the event. The root memberis set to the source window’s root window. The x_root and y_root members are set to thepointer’s coordinates relative to the root window’s origin at the time of the event.The same_screen member is set to indicate whether the event window isonthe same screen as theroot window and can be either True or False. If True, the event and root windows are on thesame screen. If False, the event and root windows are not on the same screen.If the source window isaninferior of the event window, the subwindow member of the structureis set to the child of the event window that is the source window orthe child of the event windowthat is an ancestor of the source window. Otherwise, the X server sets the subwindow member toNone. The time member is set to the time when the event was generated and is expressed in milliseconds.If the event window isonthe same screen as the root window, the x and y members are set to thecoordinates relative to the event window’s origin. Otherwise, these members are set to zero.The state member is set to indicate the logical state of the pointer buttons and modifier keys justprior to the event, which is the bitwise inclusive OR ofone or more of the button or modifier keymasks: Button1Mask, Button2Mask, Button3Mask, Button4Mask, Button5Mask, Shift-Mask, LockMask, ControlMask, Mod1Mask, Mod2Mask, Mod3Mask, Mod4Mask, andMod5Mask.Each of these structures also has a member that indicates the detail. For the XKeyPressedEventand XKeyReleasedEvent structures, this member is called a keycode. It is set to a number thatrepresents a physical key on the keyboard. The keycode is an arbitrary representation for any keyon the keyboard (see sections 12.7 and 16.1).For the XButtonPressedEvent and XButtonReleasedEvent structures, this member is calledbutton. It represents the pointer button that changed state and can be the Button1, Button2,Button3, Button4, or Button5 value. For the XPointerMovedEvent structure, this member iscalled is_hint. It can be set to NotifyNormal or NotifyHint.Some of the symbols mentioned in this section have fixed values, as follows:SymbolValueButton1MotionMask(1L
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AcknowledgmentsThe design and imple
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Release 6Stephen Gildea (X Consorti
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Xlib − C LibraryX11, Release 6.7
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4.2. Translating Screen Coordinates
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10.7. Input Focus Events . . . . .
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13.5.6.1. Input Style . . . . . . .
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