431 lines
18 KiB
Racket
431 lines
18 KiB
Racket
#lang scheme/unit
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(require mzlib/class
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"sig.ss"
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mred/mred-sig
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mzlib/list
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mzlib/etc)
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(import [prefix icon: framework:icon^]
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mred^)
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(export framework:panel^)
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(init-depend mred^)
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(define single<%> (interface (area-container<%>) active-child))
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(define single-mixin
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(mixin (area-container<%>) (single<%>)
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(inherit get-alignment change-children)
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(define/override (after-new-child c)
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(unless (is-a? c window<%>)
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;; would like to remove the child here, waiting on a PR submitted
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;; about change-children during after-new-child
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(change-children
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(λ (l)
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(remq c l)))
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(error 'single-mixin::after-new-child
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"all children must implement window<%>, got ~e"
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c))
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(if current-active-child
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(send c show #f)
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(set! current-active-child c)))
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[define/override (container-size l)
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(if (null? l)
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(values 0 0)
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(values (apply max (map car l)) (apply max (map cadr l))))]
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[define/override (place-children l width height)
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(let-values ([(h-align-spec v-align-spec) (get-alignment)])
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(let ([align
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(λ (total-size spec item-size)
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(floor
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(case spec
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[(center) (- (/ total-size 2) (/ item-size 2))]
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[(left top) 0]
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[(right bottom) (- total-size item-size)]
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[else (error 'place-children
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"alignment spec is unknown ~a~n" spec)])))])
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(map (λ (l)
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(let*-values ([(min-width min-height h-stretch? v-stretch?)
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(apply values l)]
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[(x this-width)
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(if h-stretch?
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(values 0 width)
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(values (align width h-align-spec min-width)
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min-width))]
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[(y this-height)
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(if v-stretch?
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(values 0 height)
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(values (align height v-align-spec min-height)
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min-height))])
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(list x y this-width this-height)))
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l)))]
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(inherit get-children begin-container-sequence end-container-sequence)
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[define current-active-child #f]
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(define/public active-child
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(case-lambda
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[() current-active-child]
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[(x)
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(unless (memq x (get-children))
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(error 'active-child "got a panel that is not a child: ~e" x))
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(unless (eq? x current-active-child)
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(begin-container-sequence)
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(for-each (λ (x) (send x show #f))
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(get-children))
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(set! current-active-child x)
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(send current-active-child show #t)
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(end-container-sequence))]))
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(super-instantiate ())))
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(define single-window<%> (interface (single<%> window<%>)))
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(define single-window-mixin
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(mixin (single<%> window<%>) (single-window<%>)
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(inherit get-client-size get-size)
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[define/override container-size
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(λ (l)
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(let-values ([(super-width super-height) (super container-size l)]
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[(client-width client-height) (get-client-size)]
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[(window-width window-height) (get-size)]
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[(calc-size)
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(λ (super client window)
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(+ super (max 0 (- window client))))])
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(values
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(calc-size super-width client-width window-width)
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(calc-size super-height client-height window-height))))]
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(super-new)))
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(define multi-view<%>
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(interface (area-container<%>)
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split-vertically
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split-horizontally
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collapse))
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(define multi-view-mixin
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(mixin (area-container<%>) (multi-view<%>)
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(init-field parent editor)
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(public get-editor-canvas% get-vertical% get-horizontal%)
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[define get-editor-canvas%
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(λ ()
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editor-canvas%)]
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[define get-vertical%
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(λ ()
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vertical-panel%)]
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[define get-horizontal%
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(λ ()
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horizontal-panel%)]
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(define/private (split p%)
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(let ([canvas (send (send parent get-top-level-window) get-edit-target-window)]
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[ec% (get-editor-canvas%)])
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(when (and canvas
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(is-a? canvas ec%)
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(eq? (send canvas get-editor) editor))
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(let ([p (send canvas get-parent)])
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(send p change-children (λ (x) null))
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(let ([pc (make-object p% p)])
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(send (make-object ec% (make-object vertical-panel% pc) editor) focus)
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(make-object ec% (make-object vertical-panel% pc) editor))))))
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[define/public split-vertically
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(λ ()
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(split (get-vertical%)))]
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[define/public split-horizontally
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(λ ()
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(split (get-horizontal%)))]
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(define/public (collapse)
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(let ([canvas (send (send parent get-top-level-window) get-edit-target-window)]
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[ec% (get-editor-canvas%)])
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(when (and canvas
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(is-a? canvas ec%)
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(eq? (send canvas get-editor) editor))
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(let ([p (send canvas get-parent)])
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(if (eq? p this)
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(bell)
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(let* ([sp (send p get-parent)]
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[p-to-remain (send sp get-parent)])
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(send p-to-remain change-children (λ (x) null))
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(send (make-object ec% p-to-remain editor) focus)))))))
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(super-instantiate () (parent parent))
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(make-object (get-editor-canvas%) this editor)))
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(define single% (single-window-mixin (single-mixin panel%)))
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(define single-pane% (single-mixin pane%))
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(define multi-view% (multi-view-mixin vertical-panel%))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; type gap = (make-gap number area<%> percentage number area<%> percentage)
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(define-struct gap (before before-dim before-percentage after after-dim after-percentage))
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;; type percentage : (make-percentage number)
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(define-struct percentage (%) #:mutable)
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(define dragable<%>
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(interface (window<%> area-container<%>)
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after-percentage-change
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set-percentages
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get-percentages
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get-vertical?))
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(define vertical-dragable<%>
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(interface (dragable<%>)))
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(define horizontal-dragable<%>
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(interface (dragable<%>)))
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(define dragable-mixin
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(mixin (window<%> area-container<%>) (dragable<%>)
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(init parent)
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(define/public (get-vertical?)
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(error 'get-vertical "abstract method"))
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(define/private (min-extent child)
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(let-values ([(w h) (send child get-graphical-min-size)])
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(if (get-vertical?)
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(max (send child min-height) h)
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(max (send child min-width) w))))
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(define/private (event-get-dim evt)
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(if (get-vertical?)
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(send evt get-y)
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(send evt get-x)))
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(define/private (get-gap-cursor)
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(if (get-vertical?)
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(icon:get-up/down-cursor)
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(icon:get-left/right-cursor)))
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(inherit get-client-size container-flow-modified)
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(init-field [bar-thickness 5])
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;; percentages : (listof percentage)
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(define percentages null)
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;; get-percentages : -> (listof number)
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(define/public (get-percentages)
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(map percentage-% percentages))
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(define/public (set-percentages ps)
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(unless (and (list? ps)
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(andmap number? ps)
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(= 1 (apply + ps))
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(andmap positive? ps))
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(error 'set-percentages
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"expected a list of numbers that are all positive and sum to 1, got: ~e"
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ps))
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(unless (= (length ps) (length (get-children)))
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(error 'set-percentages
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"expected a list of numbers whose length is the number of children: ~a, got ~e"
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(length (get-children))
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ps))
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(set! percentages (map make-percentage ps))
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(container-flow-modified))
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(define/pubment (after-percentage-change) (inner (void) after-percentage-change))
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(define/private (get-available-extent)
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(let-values ([(width height) (get-client-size)])
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(- (if (get-vertical?) height width)
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(* bar-thickness (- (length (get-children)) 1)))))
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(inherit get-children)
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(define/private (update-percentages)
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(let ([len-children (length (get-children))])
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(unless (= len-children (length percentages))
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(cond
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[(zero? len-children)
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'()]
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[else
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(let ([rat (/ 1 len-children)])
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(set! percentages (build-list len-children (λ (i) (make-percentage rat)))))])
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(after-percentage-change))))
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(define/override (after-new-child child)
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(update-percentages))
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(define resizing-dim #f)
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(define resizing-gap #f)
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(inherit set-cursor)
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(define/override (on-subwindow-event receiver evt)
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(if (eq? receiver this)
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(let ([gap
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(ormap (λ (gap)
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(and (<= (gap-before-dim gap)
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(event-get-dim evt)
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(gap-after-dim gap))
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gap))
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cursor-gaps)])
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(set-cursor (and (or gap
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resizing-dim)
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(let ([c (get-gap-cursor)])
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(and (send c ok?)
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c))))
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(cond
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[(and gap (send evt button-down? 'left))
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(set! resizing-dim (event-get-dim evt))
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(set! resizing-gap gap)]
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[(send evt button-up? 'left)
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(set! resizing-dim #f)
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(set! resizing-gap #f)]
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[(and resizing-dim resizing-gap (send evt moving?))
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(let-values ([(width height) (get-client-size)])
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(let* ([before-percentage (gap-before-percentage resizing-gap)]
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[orig-before (percentage-% before-percentage)]
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[after-percentage (gap-after-percentage resizing-gap)]
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[orig-after (percentage-% after-percentage)]
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[available-extent (get-available-extent)]
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[change-in-percentage (/ (- resizing-dim (event-get-dim evt)) available-extent)]
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[new-before (- (percentage-% before-percentage) change-in-percentage)]
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[new-after (+ (percentage-% after-percentage) change-in-percentage)])
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(when ((floor (* new-before available-extent)) . > . (min-extent (gap-before resizing-gap)))
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(when ((floor (* new-after available-extent)) . > . (min-extent (gap-after resizing-gap)))
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(set-percentage-%! before-percentage new-before)
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(set-percentage-%! after-percentage new-after)
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(after-percentage-change)
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(set! resizing-dim (event-get-dim evt))
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(container-flow-modified)))))]
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[else (super on-subwindow-event receiver evt)]))
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(begin
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(set-cursor #f)
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(super on-subwindow-event receiver evt))))
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(define cursor-gaps null)
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(define/override (place-children _infos width height)
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(set! cursor-gaps null)
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(update-percentages)
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(cond
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[(null? _infos) null]
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[(null? (cdr _infos)) (list (list 0 0 width height))]
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[else
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(let ([available-extent (get-available-extent)]
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[show-error
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(λ (n)
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(error 'panel.ss::dragable-panel "internal error.~a" n))])
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(let loop ([percentages percentages]
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[children (get-children)]
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[infos _infos]
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[dim 0])
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(cond
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[(null? percentages)
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(unless (null? infos) (show-error 1))
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(unless (null? children) (show-error 2))
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null]
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[(null? (cdr percentages))
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(when (null? infos) (show-error 3))
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(when (null? children) (show-error 4))
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(unless (null? (cdr infos)) (show-error 5))
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(unless (null? (cdr children)) (show-error 6))
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(if (get-vertical?)
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(list (list 0 dim width (- height dim)))
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(list (list dim 0 (- width dim) height)))]
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[else
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(when (null? infos) (show-error 7))
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(when (null? children) (show-error 8))
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(when (null? (cdr infos)) (show-error 9))
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(when (null? (cdr children)) (show-error 10))
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(let* ([info (car infos)]
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[percentage (car percentages)]
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[this-space (floor (* (percentage-% percentage) available-extent))])
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(set! cursor-gaps (cons (make-gap (car children)
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(+ dim this-space)
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percentage
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(cadr children)
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(+ dim this-space bar-thickness)
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(cadr percentages))
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cursor-gaps))
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(cons (if (get-vertical?)
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(list 0 dim width this-space)
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(list dim 0 this-space height))
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(loop (cdr percentages)
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(cdr children)
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(cdr infos)
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(+ dim this-space bar-thickness))))])))]))
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(define/override (container-size children-info)
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(update-percentages)
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(let loop ([percentages percentages]
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[children-info children-info]
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[major-size 0]
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[minor-size 0])
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(cond
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[(null? children-info)
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(if (get-vertical?)
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(values (ceiling minor-size) (ceiling major-size))
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(values (ceiling major-size) (ceiling minor-size)))]
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[(null? percentages)
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(error 'panel.ss::dragable-panel "internal error.12")]
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[else
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(let ([child-info (car children-info)]
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[percentage (car percentages)])
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(let-values ([(child-major major-stretch? child-minor minor-stretch?)
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(if (get-vertical?)
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(values (list-ref child-info 1)
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(list-ref child-info 3)
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(list-ref child-info 0)
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(list-ref child-info 2))
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(values (list-ref child-info 0)
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(list-ref child-info 2)
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(list-ref child-info 1)
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(list-ref child-info 3)))])
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(loop (cdr percentages)
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(cdr children-info)
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(max (if (zero? (percentage-% percentage))
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0
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(/ child-major (percentage-% percentage)))
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major-size)
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(max child-minor minor-size))))])))
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(super-instantiate (parent))))
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(define three-bar-pen-bar-width 8)
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(define three-bar-canvas%
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(class canvas%
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(inherit get-dc get-client-size)
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(define/override (on-paint)
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(let ([dc (get-dc)])
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(let-values ([(w h) (get-client-size)])
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(let ([sx (floor (- (/ w 2) (/ three-bar-pen-bar-width 2)))])
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(send dc set-brush (send the-brush-list find-or-create-brush (get-panel-background) 'panel))
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(send dc set-pen (send the-pen-list find-or-create-pen "black" 1 'transparent))
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(send dc draw-rectangle 0 0 w h)
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(send dc set-pen (send the-pen-list find-or-create-pen "black" 1 'solid))
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(send dc draw-line sx 1 (+ sx three-bar-pen-bar-width) 1)
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(send dc draw-line sx 4 (+ sx three-bar-pen-bar-width) 4)
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(send dc draw-line sx 7 (+ sx three-bar-pen-bar-width) 7)
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(send dc set-pen (send the-pen-list find-or-create-pen "gray" 1 'solid))
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(send dc draw-line sx 2 (+ sx three-bar-pen-bar-width) 2)
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(send dc draw-line sx 5 (+ sx three-bar-pen-bar-width) 5)
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(send dc draw-line sx 8 (+ sx three-bar-pen-bar-width) 8)))))
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(super-instantiate ())
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(inherit stretchable-height min-height)
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(stretchable-height #f)
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(min-height 10)))
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(define vertical-dragable-mixin
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(mixin (dragable<%>) (vertical-dragable<%>)
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(define/override (get-vertical?) #t)
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(super-instantiate ())))
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(define horizontal-dragable-mixin
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(mixin (dragable<%>) (vertical-dragable<%>)
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(define/override (get-vertical?) #f)
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(super-instantiate ())))
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(define vertical-dragable% (vertical-dragable-mixin (dragable-mixin vertical-panel%)))
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(define horizontal-dragable% (horizontal-dragable-mixin (dragable-mixin horizontal-panel%)))
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