honeylisp/editor/imstate.fnl
2021-07-03 22:13:04 -04:00

267 lines
10 KiB
Fennel

(local core (require :core))
(local config (require :core.config))
(local command (require :core.command))
(local keymap (require :core.keymap))
(local style (require :core.style))
(local lume (require :lib.lume))
(fn attach-imstate [view]
(set view.imstate {})
(fn view.on_mouse_pressed [self button x y clicks]
(tset self.imstate button :pressed)
(self.__index.on_mouse_pressed self button x y clicks))
(fn view.on_mouse_released [self button x y]
(tset self.imstate button :released)
(self.__index.on_mouse_released self button x y))
(fn view.on_key_pressed [self key]
(when (= self.imstate.keys nil)
(set self.imstate.keys []))
(table.insert self.imstate.keys key))
(fn view.on_text_input [self text]
(set self.imstate.text (.. (or self.imstate.text "") text))
(self.__index.on_text_input self text))
(fn view.draw [self]
(set self.cursor nil)
(self.__index.draw self)
(when self.imstate.postponed
(each [_ action (ipairs self.imstate.postponed)]
(action))
(set self.imstate.postponed nil))
(when (= self.cursor nil) (set self.cursor :arrow))
(set self.imstate.keys nil)
(set self.imstate.text nil)
(when (= self.imstate.left :released)
(set self.imstate.active nil))
(each [_ button (pairs [:left :middle :right])]
(tset self.imstate button
(match (. self.imstate button)
:pressed :down
:down :down
:released nil)))))
(fn register-keys [keys]
(local commands {})
(local keymaps {})
(each [_ key (ipairs keys)]
(local command-name (.. "imstate:" key))
(tset commands command-name #(core.active_view:on_key_pressed key))
(tset keymaps key command-name))
(command.add #(not= (-?> core.active_view.imstate (. :focus)) nil) commands)
(keymap.add keymaps))
(register-keys [:backspace :delete :left :right :shift+left :shift+right :home :end :shift+home :shift+end
:ctrl+left :ctrl+right :ctrl+shift+left :ctrl+shift+right :ctrl+c :ctrl+v])
(fn cmd-predicate [p]
(var p-fn p)
(when (= (type p-fn) :string) (set p-fn (require p-fn)))
(when (= (type p-fn) :table)
(local cls p-fn)
(set p-fn (fn [] (core.active_view:is cls))))
(fn [] (when (= (-?> core.active_view.imstate (. :focus)) nil)
(p-fn))))
(fn postpone [view f]
(when (= view.imstate.postponed nil)
(set view.imstate.postponed []))
(table.insert view.imstate.postponed f))
(fn make-tag [tag]
(match (type tag)
:string tag
:table (table.concat tag "::")
_ (tostring tag)))
(fn mouse-inside [x y w h]
(local (mx my) (values (love.mouse.getX) (love.mouse.getY)))
(and (>= mx x) (<= mx (+ x w)) (>= my y) (<= my (+ y h))))
(fn consume-pressed [view button]
(when (= (. view.imstate button) :pressed)
(tset view.imstate button :down)
true))
(fn activate [view tag x y w h]
(when (and (mouse-inside x y w h) (consume-pressed view :left))
(set view.imstate.active (make-tag tag))
true))
(fn set-cursor [view cursor]
(when (= view.cursor nil) (set view.cursor cursor)))
(fn active? [view tag] (= view.imstate.active (make-tag tag)))
(fn button [view tag x y w h]
(when (mouse-inside x y w h) (set-cursor view :hand))
(activate view tag x y w h)
(values (and (active? view tag) (= view.imstate.left :released) (mouse-inside x y w h)) (+ y h style.padding.y)))
(fn textbutton [view label x y]
(local (w h) (values (+ (style.font:get_width label) style.padding.x) (+ (style.font:get_height) style.padding.y)))
(renderer.draw_rect x y w h style.selection)
(renderer.draw_text style.font label (+ x (/ style.padding.x 2)) (+ y (/ style.padding.y 2)) style.text)
(values (button view label x y w h) (+ y h)))
(fn checkbox [view name isset x y ?tag]
(love.graphics.rectangle (if isset :fill :line) x y (* 12 SCALE) (* 12 SCALE))
(local xEnd (renderer.draw_text style.font name (+ x (* 16 SCALE)) y style.text))
(love.graphics.setColor 1 1 1 1)
(button view (or ?tag name) x y (- xEnd x) (* 12 SCALE)))
(fn focused? [view tag] (= (make-tag tag) (-?> view.imstate.focus (. :tag))))
(fn focus [view tag x y w h opts]
(if (activate view tag x y w h)
(set view.imstate.focus
(doto (lume.clone (or opts {}))
(tset :tag (make-tag tag))))
(and (= view.imstate.left :released) (focused? view tag) (not (mouse-inside x y w h)))
(set view.imstate.focus nil))
(focused? view tag))
(local blink_period 0.8)
(fn x-from-i [s i xLeft font]
(if (or (<= i 1) (= s "")) xLeft
(x-from-i (s:sub 2) (- i 1) (+ xLeft (font:get_width (s:sub 1 1))) font)))
(fn i-from-x [s x xLeft font ?i]
(local i (or ?i 1))
(local w (font:get_width (s:sub 1 1)))
(local xMid (+ xLeft (/ w 2)))
(if (or (<= x xMid) (= s "")) i
(i-from-x (s:sub 2) x (+ xLeft w) font (+ i 1))))
(fn next-match [text i di pred]
(local imax (+ (length text) 1))
(local inext (+ i di))
(if (<= inext 1) 1
(> inext imax) imax
(pred (text:sub inext inext)) (if (< di 0) i inext)
(next-match text inext di pred)))
(fn is-nonword-char [char] (config.non_word_chars:find char nil true))
(fn next-word [text i di]
(let [iwordboundary (next-match text i di #(is-nonword-char $1))]
(next-match text iwordboundary di #(not (is-nonword-char $1)))))
(fn textnav [key i text]
(local imax (+ (length text) 1))
(match key
:left (math.max 1 (- i 1))
:right (math.min imax (+ i 1))
:ctrl+left (next-word text i -1)
:ctrl+right (next-word text i 1)
:home 1
:end imax))
(fn selection-span [view]
(let [f view.imstate.focus
iStart (math.min f.i f.iAnchor)
iLim (math.max f.i f.iAnchor)]
(values iStart iLim)))
(fn selection-text [view text]
(local (iStart iLim) (selection-span view))
(text:sub iStart (- iLim 1)))
(fn replace-selection [view s replacement ?iStart ?iLim]
(local (iStart iLim) (if ?iLim (values ?iStart ?iLim) (selection-span view)))
(local text
(.. (s:sub 1 (- iStart 1))
replacement
(s:sub iLim)))
(local iNew (+ iStart (length replacement)))
(set view.imstate.focus.i iNew)
(set view.imstate.focus.iAnchor iNew)
text)
(fn textbox [view tag text x y w]
(var textNew (or text ""))
(local (h hText xText yText) (values (+ (style.font:get_height) 4) (style.font:get_height) (+ x 2) (+ y 2)))
(local initial-press (= view.imstate.left :pressed))
; handle key events
(when (focus view tag x y w h {:i 1 :iAnchor 1 :blink (love.timer.getTime)})
(local f view.imstate.focus)
(when (> f.i (+ (length text) 1)) (set f.i (+ (length text) 1)))
(when (> f.iAnchor (+ (length text) 1)) (set f.iAnchor (+ (length text) 1)))
(when view.imstate.text
(set textNew (replace-selection view textNew view.imstate.text)))
(each [_ key (ipairs (or view.imstate.keys []))]
(set view.imstate.focus.blink (love.timer.getTime))
(if (= key :ctrl+c) (system.set_clipboard (selection-text view textNew))
(= key :ctrl+v) (set textNew (replace-selection view textNew (system.get_clipboard)))
(key:find "shift%+") (set f.i (or (textnav (key:gsub "shift%+" "") f.i textNew) f.i))
(let [iNav (textnav key f.i textNew)]
(when iNav
(set f.i iNav)
(set f.iAnchor iNav))
(when (or (= key :delete) (= key :backspace))
(local (iStartDel iLimDel)
(if (not= f.i f.iAnchor) (selection-span view)
(= key :delete) (values f.i (+ f.i 1))
(= key :backspace) (values (math.max 1 (- f.i 1)) f.i)))
(set textNew (replace-selection view textNew "" iStartDel iLimDel)))))))
; handle mouse events
(when (mouse-inside x y w h) (set-cursor view :ibeam))
(when (and (focused? view tag) (active? view tag) (mouse-inside x y w h))
(local mouse-i (i-from-x textNew (love.mouse.getX) x style.font))
(when initial-press
(set view.imstate.focus.iAnchor mouse-i))
(set view.imstate.focus.i mouse-i))
; draw box
(love.graphics.setLineWidth 1)
(love.graphics.rectangle :line x y w h)
(if (focused? view tag)
; draw text with selection + caret
(let [(iStart iLim) (selection-span view)
xSelect (renderer.draw_text style.font (textNew:sub 1 (- iStart 1)) xText yText style.text)
sSelect (textNew:sub iStart (- iLim 1))
wSelect (style.font:get_width sSelect)
xTail (+ xSelect wSelect)]
(when (> wSelect 0)
(renderer.draw_rect xSelect yText wSelect hText style.selection)
(renderer.draw_text style.font sSelect xSelect yText style.text))
(renderer.draw_text style.font (textNew:sub iLim) xTail yText style.text)
(when (or (active? view tag)
(< (% (- (love.timer.getTime) view.imstate.focus.blink) (* blink_period 2)) blink_period))
(renderer.draw_rect (x-from-i textNew view.imstate.focus.i xText style.font) yText style.caret_width hText style.caret)))
; just draw the text
(renderer.draw_text style.font textNew xText yText style.text))
(love.graphics.setColor 1 1 1)
(values textNew (+ y h)))
(fn textfield [view label text x y wLabel wText]
(renderer.draw_text style.font label x y style.text)
(textbox view label text (+ x wLabel) y wText))
(fn option-text [option]
(match (type option)
:string option
:table (or option.label (tostring option))
_ (tostring option)))
(fn dropdown [view tag selection options x y w]
(local row-h (+ (style.font:get_height) style.padding.y))
(var new-selection nil)
(renderer.draw_rect x y w row-h style.selection)
(renderer.draw_text style.font (option-text selection) (+ x style.padding.x) (+ y (/ style.padding.y 2)) style.text)
(renderer.draw_text style.icon_font "-" (+ x w (- style.padding.x)) (+ y (/ style.padding.y 2)) style.text)
(when (focused? view tag)
(var row-y (+ y row-h))
(each [i option (ipairs options)]
(when (button view [(make-tag tag) i] x row-y w row-h)
(set new-selection option))
(set row-y (+ row-y row-h)))
(postpone view (fn []
(var row-y (+ y row-h))
(each [i option (ipairs options)]
(renderer.draw_rect x row-y w row-h style.selection)
(renderer.draw_text style.font (option-text option) (+ x style.padding.x) (+ row-y (/ style.padding.y 2)) style.text)
(set row-y (+ row-y row-h))))))
(focus view tag x y w row-h)
(values (or new-selection selection) (+ y row-h)))
{: attach-imstate : cmd-predicate : postpone : mouse-inside : activate : active?
: button : checkbox : textbox : textfield : textbutton : dropdown}