factor/library/ui/sliders.factor

147 lines
4.4 KiB
Factor

! Copyright (C) 2005 Slava Pestov.
! See http://factor.sf.net/license.txt for BSD license.
IN: gadgets-scrolling
USING: arrays gadgets gadgets-buttons gadgets-layouts
gadgets-theme generic kernel lists math namespaces sequences
styles threads vectors ;
! An elevator has a thumb that may be moved up and down.
TUPLE: elevator ;
: find-elevator [ elevator? ] find-parent ;
! A slider scrolls a viewport.
TUPLE: slider elevator thumb value max page ;
: find-slider [ slider? ] find-parent ;
: slider-scale ( slider -- n )
#! A scaling factor such that if x is a slider co-ordinate,
#! x*n is the screen position of the thumb, and conversely
#! for x/n. The '1 max' calls avoid division by zero.
dup slider-elevator rect-dim over gadget-orientation v. 1 max
swap slider-max 1 max / ;
: slider>screen slider-scale * ;
: screen>slider slider-scale / ;
: fix-slider-value ( n slider -- n )
dup slider-max swap slider-page - min 0 max >fixnum ;
: fix-slider ( slider -- )
#! Call after changing slots, to relayout and do invariants:
#! - max <= page
#! - 0 <= value <= max-page
dup slider-elevator relayout-1
dup slider-max over slider-page max over set-slider-max
dup slider-value over fix-slider-value swap set-slider-value ;
SYMBOL: slider-changed
: set-slider-value* ( value slider -- )
[ set-slider-value ] keep [ fix-slider ] keep
[ slider-changed ] swap handle-gesture drop ;
: elevator-drag ( elevator -- )
[ find-slider ] keep drag-loc over gadget-orientation v.
over screen>slider swap set-slider-value* ;
: thumb-actions ( thumb -- )
dup [ drop ] [ button-up ] set-action
dup [ drop ] [ button-down ] set-action
[ find-elevator elevator-drag ] [ drag ] set-action ;
: <thumb> ( vector -- thumb )
<gadget> [ set-gadget-orientation ] keep
t over set-gadget-root?
dup thumb-theme
dup thumb-actions ;
: slide-by ( amount gadget -- )
#! The gadget can be any child of a slider.
find-slider [ slider-value + ] keep set-slider-value* ;
: slide-by-page ( -1/1 gadget -- )
[ slider-page * ] keep slide-by ;
: elevator-click ( elevator -- )
dup hand get relative >r find-slider r>
over gadget-orientation v.
over screen>slider over slider-value - sgn
swap slide-by-page ;
: elevator-actions ( elevator -- )
[ elevator-click ] [ button-down ] set-action ;
C: elevator ( vector -- elevator )
dup delegate>gadget [ set-gadget-orientation ] keep
dup elevator-theme dup elevator-actions ;
: (layout-thumb) ( slider n -- n )
over gadget-orientation n*v swap slider-thumb ;
: thumb-loc ( slider -- loc )
dup slider-value swap slider>screen ;
: layout-thumb-loc ( slider -- )
dup thumb-loc (layout-thumb) set-rect-loc ;
: thumb-dim ( slider -- h )
dup slider-page swap slider>screen ;
: layout-thumb-dim ( slider -- )
dup dup thumb-dim (layout-thumb)
>r >r dup rect-dim r> rot gadget-orientation set-axis r>
set-gadget-dim ;
: layout-thumb ( slider -- )
dup layout-thumb-loc layout-thumb-dim ;
M: elevator layout* ( elevator -- )
find-slider layout-thumb ;
: slide-by-line ( -1/1 slider -- ) >r 32 * r> slide-by ;
: slider-vertical? gadget-orientation { 0 1 0 } = ;
: <slide-button> ( orientation polygon amount -- )
>r { 0.5 0.5 0.5 1.0 } swap <polygon-gadget> r>
[ swap slide-by-line ] curry <repeat-button>
[ set-gadget-orientation ] keep ;
: <up-button> ( slider orientation -- button )
swap slider-vertical? arrow-up arrow-left ? -1
<slide-button> ;
: add-up { 1 1 1 } over gadget-orientation v- first2 frame-add ;
: <down-button> ( slider orientation -- button )
swap slider-vertical? arrow-down arrow-right ? 1
<slide-button> ;
: add-down { 1 1 1 } over gadget-orientation v+ first2 frame-add ;
: add-elevator 2dup set-slider-elevator @center frame-add ;
: add-thumb 2dup slider-elevator add-gadget set-slider-thumb ;
: slider-opposite ( slider -- vector )
gadget-orientation { 1 1 0 } swap v- ;
C: slider ( vector -- slider )
dup delegate>frame
[ set-gadget-orientation ] keep
0 over set-slider-value
0 over set-slider-page
0 over set-slider-max
dup slider-opposite
dup <elevator> pick add-elevator
2dup <up-button> pick add-up
2dup <down-button> pick add-down
<thumb> over add-thumb ;
: <x-slider> ( -- slider ) { 1 0 0 } <slider> ;
: <y-slider> ( -- slider ) { 0 1 0 } <slider> ;