►The Racket Graphical Interface Toolkit
▼3 Windowing Classes
On this page:
new
button-changed?
button-down?
button-up?
dragging?
entering?
get-alt-down
get-caps-down
get-control-down
get-event-type
get-left-down
get-meta-down
get-middle-down
get-right-down
get-shift-down
get-x
get-y
leaving?
moving?
set-alt-down
set-caps-down
set-control-down
set-event-type
set-left-down
set-meta-down
set-middle-down
set-right-down
set-shift-down
set-x
set-y
Inherited methods:
from event%
get-time-stamp
set-time-stamp
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class

mouse-event% : class?

  superclass: event%

A mouse-event% object encapsulates a mouse event. Mouse events are primarily processed by on-subwindow-event in window<%> and on-event in canvas<%>.

See also Mouse and Keyboard Events.

constructor

(new mouse-event% 
    [event-type event-type] 
    [[left-down left-down] 
    [middle-down middle-down] 
    [right-down right-down] 
    [x x] 
    [y y] 
    [shift-down shift-down] 
    [control-down control-down] 
    [meta-down meta-down] 
    [alt-down alt-down] 
    [time-stamp time-stamp] 
    [caps-down caps-down]]) 
 → (is-a?/c mouse-event%)
  event-type : 
(or/c 'enter 'leave 'left-down 'left-up
      'middle-down 'middle-up
      'right-down 'right-up 'motion)
  left-down : any/c = #f
  middle-down : any/c = #f
  right-down : any/c = #f
  x : exact-integer? = 0
  y : exact-integer? = 0
  shift-down : any/c = #f
  control-down : any/c = #f
  meta-down : any/c = #f
  alt-down : any/c = #f
  time-stamp : exact-integer? = 0
  caps-down : any/c = #f
Creates a mouse event for a particular type of event. The event types are:

See the corresponding get- and set- methods for information about left-down, middle-down, right-down, x, y, shift-down, control-down, meta-down, alt-down, time-stamp, and caps-down.

method

(send a-mouse-event button-changed? [button]) → boolean?

  button : (or/c 'left 'middle 'right 'any) = 'any
Returns #t if this was a mouse button press or release event, #f otherwise. See also button-up? and button-down?.

If button is not 'any, then #t is only returned if it is a release event for a specific button.

method

(send a-mouse-event button-down? [button]) → boolean?

  button : (or/c 'left 'middle 'right 'any) = 'any
Returns #t if the event is for a button press, #f otherwise.

If button is not 'any, then #t is only returned if it is a press event for a specific button.

method

(send a-mouse-event button-up? [button]) → boolean?

  button : (or/c 'left 'middle 'right 'any) = 'any
Returns #t if the event is for a button release, #f otherwise. (As noted in Mouse and Keyboard Events, button release events are sometimes dropped.)

If button is not 'any, then #t is only returned if it is a release event for a specific button.

method

(send a-mouse-event dragging?) → boolean?

Returns #t if this was a dragging event (motion while a button is pressed), #f otherwise.

method

(send a-mouse-event entering?) → boolean?

Returns #t if this event is for the mouse entering a window, #f otherwise.

When the mouse button is up, an enter/leave event notifies a window that it will start/stop receiving mouse events. When the mouse button is down, however, the window receiving the mouse-down event receives all mouse events until the button is released; enter/leave events are not sent to other windows, and are not reliably delivered to the click-handling window (since the window can detect movement out of its region via get-x and get-y). See also Mouse and Keyboard Events.

method

(send a-mouse-event get-alt-down) → boolean?

Returns #t if the Option (Mac OS X) key was down for the event. When the Alt key is pressed in Windows, it is reported as a Meta press (see get-meta-down).

method

(send a-mouse-event get-caps-down) → boolean?

Returns #t if the Caps Lock key was on for the event.

method

(send a-mouse-event get-control-down) → boolean?

Returns #t if the Control key was down for the event.

On Mac OS X, if a control-key press is combined with a mouse button click, the event is reported as a right-button click and get-control-down for the event reports #f.

method

(send a-mouse-event get-event-type)

 → 
(or/c 'enter 'leave 'left-down 'left-up
      'middle-down 'middle-up
      'right-down 'right-up 'motion)
Returns the type of the event; see mouse-event% for information about each event type. See also set-event-type.

method

(send a-mouse-event get-left-down) → boolean?

Returns #t if the left mouse button was down (but not pressed) during the event.

method

(send a-mouse-event get-meta-down) → boolean?

Returns #t if the Meta (Unix), Alt (Windows), or Command (Mac OS X) key was down for the event.

method

(send a-mouse-event get-middle-down) → boolean?

Returns #t if the middle mouse button was down (but not pressed) for the event. On Mac OS X, a middle-button click is impossible.

method

(send a-mouse-event get-right-down) → boolean?

Returns #t if the right mouse button was down (but not pressed) for the event. On Mac OS X, a control-click combination is treated as a right-button click.

method

(send a-mouse-event get-shift-down) → boolean?

Returns #t if the Shift key was down for the event.

method

(send a-mouse-event get-x) → exact-integer?

Returns the x-position of the mouse at the time of the event, in the target’s window’s (client-area) coordinate system.

method

(send a-mouse-event get-y) → exact-integer?

Returns the y-position of the mouse at the time of the event in the target’s window’s (client-area) coordinate system.

method

(send a-mouse-event leaving?) → boolean?

Returns #t if this event is for the mouse leaving a window, #f otherwise.

See entering? for information about enter and leave events while the mouse button is clicked.

method

(send a-mouse-event moving?) → boolean?

Returns #t if this was a moving event (whether a button is pressed is not), #f otherwise.

method

(send a-mouse-event set-alt-down down?) → void?

  down? : any/c
Sets whether the Option (Mac OS X) key was down for the event. When the Alt key is pressed in Windows, it is reported as a Meta press (see set-meta-down).

method

(send a-mouse-event set-caps-down down?) → void?

  down? : any/c
Sets whether the Caps Lock key was on for the event.

method

(send a-mouse-event set-control-down down?) → void?

  down? : any/c
Sets whether the Control key was down for the event.

On Mac OS X, if a control-key press is combined with a mouse button click, the event is reported as a right-button click and get-control-down for the event reports #f.

method

(send a-mouse-event set-event-type event-type) → void?

  event-type : 
(or/c 'enter 'leave 'left-down 'left-up
      'middle-down 'middle-up
      'right-down 'right-up 'motion)
Sets the type of the event; see mouse-event% for information about each event type. See also get-event-type.

method

(send a-mouse-event set-left-down down?) → void?

  down? : any/c
Sets whether the left mouse button was down (but not pressed) during the event.

method

(send a-mouse-event set-meta-down down?) → void?

  down? : any/c
Sets whether the Meta (Unix), Alt (Windows), or Command (Mac OS X) key was down for the event.

method

(send a-mouse-event set-middle-down down?) → void?

  down? : any/c
Sets whether the middle mouse button was down (but not pressed) for the event. On Mac OS X, a middle-button click is impossible.

method

(send a-mouse-event set-right-down down?) → void?

  down? : any/c
Sets whether the right mouse button was down (but not pressed) for the event. On Mac OS X, a control-click combination by the user is treated as a right-button click.

method

(send a-mouse-event set-shift-down down?) → void?

  down? : any/c
Sets whether the Shift key was down for the event.

method

(send a-mouse-event set-x pos) → void?

  pos : exact-integer?
Sets the x-position of the mouse at the time of the event in the target’s window’s (client-area) coordinate system.

method

(send a-mouse-event set-y pos) → void?

  pos : exact-integer?
Sets the y-position of the mouse at the time of the event in the target’s window’s (client-area) coordinate system.

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