342 lines
12 KiB
Scheme
342 lines
12 KiB
Scheme
#lang scheme/base
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(require scheme/gui/base
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scheme/class)
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(provide switchable-button%)
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(define gap 4) ;; space between the text and the icon
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(define margin 2)
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(define w-circle-space 6)
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(define h-circle-space 6)
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(define rhs-pad 2) ;; extra space outside the bitmap, but inside the mouse highlighting (on the right)
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(define half-gray (make-object color% 127 127 127))
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(define one-fifth-gray (make-object color% 200 200 200))
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(define yellow-message%
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(class canvas%
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(init-field label)
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(define/override (on-paint)
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(let ([dc (get-dc)])
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(let ([pen (send dc get-pen)]
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[brush (send dc get-brush)]
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[font (send dc get-font)]
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[yellow (make-object color% 255 255 200)])
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(send dc set-pen yellow 1 'transparent)
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(send dc set-brush yellow 'solid)
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(let-values ([(cw ch) (get-client-size)])
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(send dc draw-rectangle 0 0 cw ch)
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(send dc set-font small-control-font)
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(let-values ([(tw th _1 _2) (send dc get-text-extent label)])
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(send dc draw-text
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label
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(- (/ cw 2) (/ tw 2))
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(- (/ ch 2) (/ th 2)))))
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(send dc set-pen pen)
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(send dc set-brush brush)
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(send dc set-font font))))
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(inherit stretchable-width stretchable-height
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min-width min-height
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get-client-size get-dc)
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(super-new)
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(let-values ([(tw th _1 _2) (send (get-dc) get-text-extent label small-control-font)])
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(min-width (floor (inexact->exact (+ tw 4))))
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(min-height (floor (inexact->exact (+ th 4)))))))
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(define switchable-button%
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(class canvas%
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(init-field label
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bitmap
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callback
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[alternate-bitmap bitmap]
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[vertical-tight? #f])
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(when (and (is-a? label bitmap%)
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(not (send label ok?)))
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(error 'switchable-button% "label bitmap is not ok?"))
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(define/override (get-label) label)
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(define disable-bitmap (make-dull-mask bitmap))
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(define alternate-disable-bitmap
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(if (eq? bitmap alternate-bitmap)
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disable-bitmap
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(make-dull-mask alternate-bitmap)))
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(inherit get-dc min-width min-height get-client-size refresh
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client->screen)
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(define down? #f)
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(define in? #f)
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(define disabled? #f)
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(define with-label? (string? label))
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(define/override (enable e?)
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(unless (equal? disabled? (not e?))
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(set! disabled? (not e?))
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(set! down? #f)
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(set! in? #f)
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(refresh)))
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(define/override (is-enabled?) (not disabled?))
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(define/override (on-superwindow-show show?)
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(unless show?
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(set! in? #f)
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(set! down? #f))
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(super on-superwindow-show show?))
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(define/override (on-event evt)
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(cond
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[(send evt button-down? 'left)
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(set! down? #t)
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(set! in? #t)
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(refresh)
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(update-float #t)]
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[(send evt button-up? 'left)
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(set! down? #f)
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(update-in evt)
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(refresh)
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(when (and in?
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(not disabled?))
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(callback this))]
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[(send evt entering?)
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(set! in? #t)
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(update-float #t)
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(unless disabled?
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(refresh))]
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[(send evt leaving?)
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(set! in? #f)
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(update-float #f)
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(unless disabled?
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(refresh))]
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[(send evt moving?)
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(update-in evt)]))
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(define/public (command)
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(callback this)
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(void))
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(define float-window #f)
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(inherit get-width get-height)
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(define timer (new timer%
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[just-once? #t]
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[notify-callback
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(λ ()
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(unless with-label?
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(unless (equal? (send float-window is-shown?) in?)
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(send float-window show in?)))
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(set! timer-running? #f))]))
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(define timer-running? #f)
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(define/private (update-float new-value?)
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(when label
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(cond
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[with-label?
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(when float-window
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(send float-window show #f))]
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[else
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(unless (and float-window
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(equal? new-value? (send float-window is-shown?)))
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(cond
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[in?
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(unless float-window
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(set! float-window (new frame%
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[label ""]
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[style '(no-caption no-resize-border float)]
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[stretchable-width #f]
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[stretchable-height #f]))
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(new yellow-message% [parent float-window] [label (or label "")]))
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(send float-window reflow-container)
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;; position the floating window
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(let-values ([(dw dh) (get-display-size)]
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[(x y) (client->screen (floor (get-width))
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(floor
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(- (/ (get-height) 2)
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(/ (send float-window get-height) 2))))]
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[(dx dy) (get-display-left-top-inset)])
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(let ([rhs-x (- x dx)]
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[rhs-y (- y dy)])
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(cond
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[(< (+ rhs-x (send float-window get-width)) dw)
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(send float-window move rhs-x rhs-y)]
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[else
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(send float-window move
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(- rhs-x (send float-window get-width) (get-width))
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rhs-y)])))
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(unless timer-running?
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(set! timer-running? #t)
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(send timer start 500 #t))]
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[else
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(when float-window
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(send float-window show #f))]))])))
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(define/private (update-in evt)
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(let-values ([(cw ch) (get-client-size)])
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(let ([new-in?
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(and (<= 0 (send evt get-x) cw)
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(<= 0 (send evt get-y) ch))])
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(unless (equal? new-in? in?)
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(set! in? new-in?)
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(update-float in?)
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(refresh)))))
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(define/override (on-paint)
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(let ([dc (get-dc)])
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(let-values ([(cw ch) (get-client-size)])
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(let ([alpha (send dc get-alpha)]
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[pen (send dc get-pen)]
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[brush (send dc get-brush)])
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;; Draw background. Use alpha blending if it can work,
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;; otherwise fall back to a suitable color.
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(let ([color (cond
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[disabled? #f]
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[in? (if (eq? (send dc get-smoothing) 'aligned)
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(if down? 0.5 0.2)
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(if down?
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half-gray
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one-fifth-gray))]
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[else #f])])
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(when color
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(send dc set-pen "black" 1 'transparent)
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(send dc set-brush (if (number? color) "black" color) 'solid)
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(when (number? color)
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(send dc set-alpha color))
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(send dc draw-rounded-rectangle
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margin
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margin
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(max 0 (- cw margin margin))
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(max 0 (- ch margin margin)))
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(when (number? color)
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(send dc set-alpha alpha))))
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(send dc set-font normal-control-font)
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(when disabled?
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(send dc set-alpha .5))
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(cond
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[with-label?
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(let-values ([(tw th _1 _2) (send dc get-text-extent label)])
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(let ([text-start (+ (/ cw 2)
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(- (/ tw 2))
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(- (/ (send bitmap get-width) 2))
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(- rhs-pad))])
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(send dc draw-text label text-start (- (/ ch 2) (/ th 2)))
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(draw-the-bitmap (+ text-start tw gap) (- (/ ch 2) (/ (send bitmap get-height) 2)))))]
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[else
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(draw-the-bitmap (- (/ cw 2) (/ (send (if with-label? bitmap alternate-bitmap) get-width) 2))
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(- (/ ch 2) (/ (send (if with-label? bitmap alternate-bitmap) get-height) 2)))])
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(send dc set-pen pen)
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(send dc set-alpha alpha)
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(send dc set-brush brush)))))
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(define/private (draw-the-bitmap x y)
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(let ([bm (if with-label? bitmap alternate-bitmap)])
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(send (get-dc)
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draw-bitmap
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bm
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x y
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'solid
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(send the-color-database find-color "black")
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(if disabled?
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(if with-label? disable-bitmap alternate-disable-bitmap)
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(send bm get-loaded-mask)))))
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(define/public (set-label-visible h?)
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(unless (equal? with-label? h?)
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(set! with-label? h?)
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(update-sizes)
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(update-float (and with-label? in?))
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(refresh)))
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(define/private (update-sizes)
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(let ([dc (get-dc)])
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(cond
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[with-label?
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(let-values ([(w h _1 _2) (send dc get-text-extent label normal-control-font)])
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(do-w/h (+ w gap (send bitmap get-width) rhs-pad)
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(max h (send bitmap get-height))))]
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[else
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(do-w/h (send alternate-bitmap get-width)
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(send alternate-bitmap get-height))])))
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(define/private (do-w/h w h)
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(let ([w (floor (inexact->exact w))]
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[h (floor (inexact->exact h))])
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(min-width (+ w w-circle-space margin margin))
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(min-height (+ h h-circle-space margin margin
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(if vertical-tight? -6 0)))))
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(super-new [style '(transparent no-focus)])
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(send (get-dc) set-smoothing 'aligned)
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(inherit stretchable-width stretchable-height)
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(stretchable-width #f)
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(stretchable-height #f)
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(inherit get-graphical-min-size)
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(update-sizes)))
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(define (make-dull-mask bitmap)
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(let ([alpha-bm (send bitmap get-loaded-mask)])
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(and alpha-bm
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(let* ([w (send alpha-bm get-width)]
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[h (send alpha-bm get-height)]
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[disable-bm (make-object bitmap% w h)]
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[pixels (make-bytes (* 4 w h))]
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[bdc (make-object bitmap-dc% alpha-bm)])
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(send bdc get-argb-pixels 0 0 w h pixels)
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(let loop ([i 0])
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(when (< i (* 4 w h))
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(bytes-set! pixels i (- 255 (quotient (- 255 (bytes-ref pixels i)) 2)))
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(loop (+ i 1))))
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(send bdc set-bitmap disable-bm)
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(send bdc set-argb-pixels 0 0 w h pixels)
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(send bdc set-bitmap #f)
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disable-bm))))
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#;
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(begin
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(define f (new frame% [label ""]))
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(define vp (new vertical-pane% [parent f]))
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(define p (new horizontal-panel% [parent vp] [alignment '(right top)]))
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(define label "Run")
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(define bitmap (make-object bitmap% (build-path (collection-path "icons") "run.png") 'png/mask))
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(define foot (make-object bitmap% (build-path (collection-path "icons") "foot.png") 'png/mask))
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(define foot-up (make-object bitmap% (build-path (collection-path "icons") "foot-up.png") 'png/mask))
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(define b1 (new switchable-button% [parent p] [label label] [bitmap bitmap] [callback void]))
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(define b2 (new switchable-button% [parent p] [label label] [bitmap bitmap] [callback void]))
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(define b3 (new switchable-button% [parent p] [label "Step"] [bitmap foot] [alternate-bitmap foot-up] [callback void]))
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(define sb (new button% [parent p] [stretchable-width #t] [label "b"]))
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(define swap-button
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(new button%
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[parent f]
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[label "swap"]
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[callback
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(let ([state #t])
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(λ (a b)
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(set! state (not state))
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(send b1 set-label-visible state)
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(send b2 set-label-visible state)
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(send b3 set-label-visible state)))]))
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(define disable-button
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(new button%
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[parent f]
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[label "disable"]
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[callback
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(λ (a b)
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(send sb enable (not (send sb is-enabled?)))
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(send b1 enable (not (send b1 is-enabled?))))]))
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(send f show #t))
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