91 lines
2.7 KiB
Factor
91 lines
2.7 KiB
Factor
! Copyright (C) 2005 Slava Pestov.
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! See http://factor.sf.net/license.txt for BSD license.
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IN: gadgets-scrolling
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USING: arrays gadgets gadgets-layouts generic kernel math
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namespaces sequences ;
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! A scroller combines a viewport with two x and y sliders.
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! The follows slot is set by scroll-to.
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TUPLE: scroller viewport x y follows ;
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: scroller-origin ( scroller -- { x y 0 } )
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dup scroller-x slider-value
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swap scroller-y slider-value
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0 3array ;
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: find-scroller [ scroller? ] find-parent ;
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: scroll-to ( gadget -- )
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#! Scroll the scroller that contains this gadget, if any, so
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#! that the gadget becomes visible.
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dup find-scroller dup
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[ [ set-scroller-follows ] keep relayout ] [ 2drop ] if ;
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: scroll-up-line scroller-y -1 swap slide-by-line ;
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: scroll-down-line scroller-y 1 swap slide-by-line ;
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: scroller-actions ( scroller -- )
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dup [ scroll-up-line ] T{ wheel-up } set-action
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dup [ scroll-down-line ] T{ wheel-down } set-action
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[ relayout-1 ] T{ slider-changed } set-action ;
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C: scroller ( gadget -- scroller )
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#! Wrap a scrolling pane around the gadget.
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{
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{ [ <viewport> ] set-scroller-viewport @center }
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{ [ <x-slider> ] set-scroller-x @bottom }
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{ [ <y-slider> ] set-scroller-y @right }
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} make-frame*
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dup scroller-actions
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t over set-gadget-root? ;
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: set-slider ( value page max slider -- )
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#! page/max/value are 3-vectors.
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[ [ gadget-orientation v. ] keep set-slider-max ] keep
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[ [ gadget-orientation v. ] keep set-slider-page ] keep
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[ [ gadget-orientation v. ] keep set-slider-value* ] keep
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slider-elevator relayout-1 ;
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: update-slider ( scroller value slider -- )
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>r swap scroller-viewport dup rect-dim swap viewport-dim
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r> set-slider ;
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: scroll ( scroller value -- )
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2dup over scroller-x update-slider
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over scroller-y update-slider ;
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: pop-follows ( scroller -- follows )
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dup scroller-follows f rot set-scroller-follows ;
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: (do-scroll) ( gadget viewport -- point )
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[ [ swap relative-rect ] keep rect-union ] keep
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[ rect-extent v+ ] 2apply v- ;
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: do-scroll ( scroller -- delta )
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dup pop-follows dup [
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swap scroller-viewport (do-scroll)
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] [
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2drop { 0 0 0 }
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] if ;
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: update-scroller ( scroller -- )
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[ dup do-scroll ] keep scroller-origin v+ scroll ;
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: position-viewport ( scroller -- )
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dup scroller-origin vneg
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swap scroller-viewport gadget-child
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set-rect-loc ;
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M: scroller layout* ( scroller -- )
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dup delegate layout*
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dup layout-children
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dup update-scroller position-viewport ;
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M: scroller focusable-child* ( scroller -- viewport )
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scroller-viewport ;
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: scroller-gadget ( scroller -- gadget )
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#! Gadget being scrolled.
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scroller-viewport gadget-child ;
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