blob: c6d2b96c64998e4cbef75ce5bfa2f945fd928306 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
;;; Sly
;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Mouse signals.
;;
;;; Code:
(define-module (sly input mouse)
#:use-module (ice-9 match)
#:use-module ((sdl2 events) #:prefix sdl2:)
#:use-module (sly window)
#:use-module (sly event)
#:use-module (sly signal)
#:use-module (sly math vector)
#:export (mouse-move-hook
mouse-press-hook
mouse-click-hook
mouse-x
mouse-y
mouse-position
mouse-last-down
mouse-last-up
mouse-down?))
(define mouse-move-hook (make-hook 1))
(register-event-handler
'mouse-motion
(lambda (e)
(run-hook mouse-move-hook
(vector2 (sdl2:mouse-motion-event-x e)
(sdl2:mouse-motion-event-y e)))))
(define-signal mouse-position
(hook->signal mouse-move-hook
(vector2 0 0)
;; Sly uses the bottom-left as the origin, so invert
;; the y-axis for convenience.
(match-lambda
(($ <vector2> x y)
(vector2 x (- (signal-ref window-height) y))))))
(define-signal mouse-x (signal-map vx mouse-position))
(define-signal mouse-y (signal-map vy mouse-position))
(define mouse-press-hook (make-hook 2))
(register-event-handler
'mouse-button-down
(lambda (e)
(run-hook mouse-press-hook
(sdl2:mouse-button-event-button e)
(vector2 (sdl2:mouse-button-event-x e)
(sdl2:mouse-button-event-y e)))))
(define-signal mouse-last-down
(hook->signal mouse-press-hook
'none
(lambda (button position) button)))
(define mouse-click-hook (make-hook 2))
(register-event-handler
'mouse-button-up
(lambda (e)
(run-hook mouse-click-hook
(sdl2:mouse-button-event-button e)
(vector2 (sdl2:mouse-button-event-x e)
(sdl2:mouse-button-event-y e)))))
(define-signal mouse-last-up
(hook->signal mouse-click-hook
'none
(lambda (button position) button)))
(define (mouse-down? button)
"Create a signal for the state of BUTTON. Value is #t when mouse
button is pressed or #f otherwise."
(define (same-button? other-button)
(eq? button other-button))
(define (button-filter value signal)
(signal-constant value (signal-filter #f same-button? signal)))
(signal-merge (button-filter #f mouse-last-up)
(button-filter #t mouse-last-down)))
|
