390 lines
16 KiB
Fennel
390 lines
16 KiB
Fennel
(local core (require :core))
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(local config (require :core.config))
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(local command (require :core.command))
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(local keymap (require :core.keymap))
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(local style (require :core.style))
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(local lume (require :lib.lume))
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(fn attach-imstate [view]
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(set view.imstate {})
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(fn view.on_mouse_pressed [self button x y clicks]
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(tset self.imstate button :pressed)
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(self.__index.on_mouse_pressed self button x y clicks))
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(fn view.on_mouse_released [self button x y]
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(tset self.imstate button :released)
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(self.__index.on_mouse_released self button x y))
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(fn view.on_key_pressed [self key]
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(when (= self.imstate.keys nil)
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(set self.imstate.keys []))
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(table.insert self.imstate.keys key))
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(fn view.on_text_input [self text]
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(set self.imstate.text (.. (or self.imstate.text "") text))
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(self.__index.on_text_input self text))
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(fn view.form [self ?overrides]
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(lume.merge {:x (+ self.position.x style.padding.x (- self.scroll.x))
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:y (+ self.position.y style.padding.y (- self.scroll.y))
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:w (- self.size.x (* style.padding.x 2))
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:view self}
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(or ?overrides {})))
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(fn view.end-scroll [self {: y : h}]
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(let [pin-to-bottom (>= self.scroll.to.y (- self.scrollheight self.size.y))]
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(set self.scrollheight (- (+ y (or h 0) style.padding.y) (+ self.position.y style.padding.y (- self.scroll.y))))
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(when pin-to-bottom (set self.scroll.to.y (- self.scrollheight self.size.y)))))
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(fn view.draw [self]
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(set self.cursor nil)
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(self.__index.draw self)
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(when self.imstate.postponed
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(each [_ action (ipairs self.imstate.postponed)]
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(action))
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(set self.imstate.postponed nil))
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(when (= self.cursor nil) (set self.cursor :arrow))
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(set self.imstate.keys nil)
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(set self.imstate.text nil)
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(when (= self.imstate.left :released)
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(set self.imstate.active nil))
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(each [_ button (pairs [:left :middle :right])]
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(tset self.imstate button
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(match (. self.imstate button)
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:pressed :down
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:down :down
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:released nil)))))
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(fn register-keys [keys]
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(local commands {})
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(local keymaps {})
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(each [_ key (ipairs keys)]
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(local command-name (.. "imstate:" key))
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(tset commands command-name #(core.active_view:on_key_pressed key))
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(tset keymaps key command-name))
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(command.add #(not= (-?> core.active_view.imstate (. :focus)) nil) commands)
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(keymap.add keymaps))
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(register-keys [:backspace :delete :left :right :shift+left :shift+right :home :end :shift+home :shift+end
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:ctrl+left :ctrl+right :ctrl+shift+left :ctrl+shift+right :ctrl+c :ctrl+v])
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(fn cmd-predicate [p]
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(var p-fn p)
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(when (= (type p-fn) :string) (set p-fn (require p-fn)))
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(when (= (type p-fn) :table)
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(local cls p-fn)
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(set p-fn (fn [] (core.active_view:is cls))))
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(fn [] (when (= (-?> core.active_view.imstate (. :focus)) nil)
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(p-fn))))
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(fn postpone [view f]
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(when (= view.imstate.postponed nil)
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(set view.imstate.postponed []))
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(table.insert view.imstate.postponed f))
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(fn make-tag [tag]
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(match (type tag)
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:string tag
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:table (table.concat tag "::")
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_ (tostring tag)))
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(fn mouse-inside [x y w h]
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(local (mx my) (values (love.mouse.getX) (love.mouse.getY)))
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(and (>= mx x) (<= mx (+ x w)) (>= my y) (<= my (+ y h))))
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(fn consume-pressed [view button]
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(when (= (. view.imstate button) :pressed)
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(tset view.imstate button :down)
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true))
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(fn activate [{: view : tag : x : y : w : h}]
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(when (and (mouse-inside x y w h) (consume-pressed view :left))
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(set view.imstate.active (make-tag tag))
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true))
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(fn set-cursor [view cursor]
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(when (= view.cursor nil) (set view.cursor cursor)))
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;; styling and layout
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(fn form-defaults [form k v ...]
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(when (= (. form k) nil)
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(let [v (if (= (type v) :function) (v form) v)]
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(tset form k v)))
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(if (>= (select :# ...) 2) (form-defaults form ...)
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(do (when form.tag (set form.tag (make-tag form.tag))) ; fix up tag
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form)))
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(fn with-style [form ...]
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(form-defaults form :font style.font :color style.text :xpad style.padding.x :ypad style.padding.y ...))
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(local form-preserved-keys (collect [_ key (ipairs [:view :x :y :font :color :xpad :ypad])] key true))
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(fn reform [form overrides]
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(if (and overrides overrides.into (not= overrides.into form))
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(reform (lume.extend (lume.clear overrides.into) form) overrides)
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(do (each [key (pairs form)]
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(when (= (. form-preserved-keys key) nil)
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(tset form key nil)))
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(lume.extend form (or overrides {})))))
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(fn under [form overrides] (reform form (lume.merge (or overrides {}) {:y (+ form.y (or form.h 0) (or form.ypad 0))})))
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(fn right-of [form overrides] (reform form (lume.merge (or overrides {}) {:x (+ form.x (or form.w 0) (or form.xpad 0))})))
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(fn group-wrapper [orig-form]
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(let [group {}
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update-dimension
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(fn [form coord-key size-key]
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(let [coord-group (. group coord-key) size-group (. group size-key)
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coord-form (. form coord-key) size-form (. form size-key)]
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(if (= size-form nil) ; tried to add an unsized value to the group, ignore
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nil
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(= coord-group nil) ; container takes on the size of its first item
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(do (tset group coord-key coord-form)
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(tset group size-key size-form))
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(> coord-group coord-form) ; we have an item that is outside the bounds to the left / up; reduce the starting point and extend the size
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(do (tset group coord-key coord-form)
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(tset group size-key (- (math.max (+ coord-form size-form) (+ coord-group size-group)) coord-form)))
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; extend the size if the new item is outside the bounds to the right / down
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(tset group size-key (- (math.max (+ coord-form size-form) (+ coord-group size-group)) coord-group)))
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form))
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update-dimensions (fn [form] (update-dimension form :x :w) (update-dimension form :y :h))]
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(fn [?viewfn-or-form ?form ...]
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(match [(type ?viewfn-or-form) ?viewfn-or-form]
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[:function viewfn] (let [result [(viewfn ?form ...)]]
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(update-dimensions ?form)
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(table.unpack result))
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[:table form] (update-dimensions form)
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[:nil] (lume.extend orig-form group)))))
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(fn horiz-wrapper [{:x orig-x :w orig-w}]
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(fn [{: x : y : w : h : xpad : ypad &as form} overrides]
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(if (> (+ x (or w 0) xpad (or w 0)) (+ orig-x orig-w))
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(reform form (lume.merge (or overrides {}) {:x orig-x :y (+ y (or h 0) (or ypad 0))}))
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(right-of form overrides))))
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;; widgets and widget helpers
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(fn active? [view tag] (= view.imstate.active (make-tag tag)))
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(fn button [{: view : tag : x : y : w : h &as form}]
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(when (mouse-inside x y w h) (set-cursor view :hand))
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(activate form)
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(and (active? view tag) (= view.imstate.left :released) (mouse-inside x y w h)))
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(fn label [form text]
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(let [(_ newlines) (text:gsub "\n" "\n")
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text-height (fn [font] (* (font:get_height) (+ newlines 1)))
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{: x : y : w : h : halign : valign : font : color}
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(with-style form
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:w #($1.font:get_width text)
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:h #(text-height $1.font)
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:halign :left
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:valign :center)
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x (match halign :left x :center (+ x (/ (- w (font:get_width text)) 2)) :right (+ x w (- (font:get_width text))))
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y (match valign :top y :center (+ y (/ (- h (text-height font)) 2)) :bottom (+ y h (- (text-height font))))]
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(renderer.draw_text font text x y color)))
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(fn textbutton [form label]
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(let [{: x : y : w : h : xpad : ypad : font : color : bg}
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(with-style form
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:bg style.selection
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:tag label
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:w #(+ ($1.font:get_width label) $1.xpad)
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:h #(+ ($1.font:get_height) $1.ypad))]
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(renderer.draw_rect x y w h bg)
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(renderer.draw_text font label (+ x (/ xpad 2)) (+ y (/ ypad 2)) color)
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(button form)))
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(fn checkbox [form name isset]
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(let [{: x : y : w : h : font : color : x-label}
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(with-style form
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:tag name
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:h (* 12 SCALE)
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:x-label #(+ $1.x $1.h $1.xpad)
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:w #(+ $1.x-label ($1.font:get_width name)))]
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(love.graphics.rectangle (if isset :fill :line) x y h h)
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(renderer.draw_text font name x-label y color)
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(love.graphics.setColor 1 1 1 1)
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(button form))) ; whose idea was this?? should return (not isset) >:/
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(fn focused? [view tag] (= (make-tag tag) (-?> view.imstate.focus (. :tag))))
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(fn focus [{: view : tag : x : y : w : h &as form} opts]
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(if (activate form)
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(set view.imstate.focus
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(doto (lume.clone (or opts {}))
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(tset :tag (make-tag tag))))
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(and (= view.imstate.left :released) (focused? view tag) (not (mouse-inside x y w h)))
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(set view.imstate.focus nil))
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(focused? view tag))
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(local blink_period 0.8)
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(fn x-from-i [s i xLeft font]
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(if (or (<= i 1) (= s "")) xLeft
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(x-from-i (s:sub 2) (- i 1) (+ xLeft (font:get_width (s:sub 1 1))) font)))
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(fn i-from-x [s x xLeft font ?i]
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(local i (or ?i 1))
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(local w (font:get_width (s:sub 1 1)))
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(local xMid (+ xLeft (/ w 2)))
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(if (or (<= x xMid) (= s "")) i
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(i-from-x (s:sub 2) x (+ xLeft w) font (+ i 1))))
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(fn next-match [text i di pred]
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(local imax (+ (length text) 1))
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(local inext (+ i di))
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(if (<= inext 1) 1
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(> inext imax) imax
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(pred (text:sub inext inext)) (if (< di 0) i inext)
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(next-match text inext di pred)))
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(fn is-nonword-char [char] (config.non_word_chars:find char nil true))
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(fn next-word [text i di]
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(let [iwordboundary (next-match text i di #(is-nonword-char $1))]
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(next-match text iwordboundary di #(not (is-nonword-char $1)))))
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(fn textnav [key i text]
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(local imax (+ (length text) 1))
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(match key
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:left (math.max 1 (- i 1))
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:right (math.min imax (+ i 1))
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:ctrl+left (next-word text i -1)
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:ctrl+right (next-word text i 1)
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:home 1
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:end imax))
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(fn selection-span [view]
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(let [f view.imstate.focus
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iStart (math.min f.i f.iAnchor)
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iLim (math.max f.i f.iAnchor)]
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(values iStart iLim)))
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(fn selection-text [view text]
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(local (iStart iLim) (selection-span view))
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(text:sub iStart (- iLim 1)))
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(fn replace-selection [view s replacement ?iStart ?iLim]
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(local (iStart iLim) (if ?iLim (values ?iStart ?iLim) (selection-span view)))
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(local text
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(.. (s:sub 1 (- iStart 1))
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replacement
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(s:sub iLim)))
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(local iNew (+ iStart (length replacement)))
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(set view.imstate.focus.i iNew)
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(set view.imstate.focus.iAnchor iNew)
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text)
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(fn textbox [form text]
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(local {: font : color : w : h : x : y : xpad : ypad : color : view : tag}
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(with-style form :h #(+ ($1.font:get_height) $1.ypad)))
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(var textNew (or text ""))
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(local (hText xText yText) (values (font:get_height) (+ x (/ xpad 2)) (+ y (/ ypad 2))))
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(local initial-press (= view.imstate.left :pressed))
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; handle key events
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(when (focus form {:i 1 :iAnchor 1 :blink (love.timer.getTime)})
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(local f view.imstate.focus)
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(when (> f.i (+ (length textNew) 1)) (set f.i (+ (length textNew) 1)))
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(when (> f.iAnchor (+ (length textNew) 1)) (set f.iAnchor (+ (length textNew) 1)))
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(when view.imstate.text
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(set textNew (replace-selection view textNew view.imstate.text)))
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(each [_ key (ipairs (or view.imstate.keys []))]
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(set view.imstate.focus.blink (love.timer.getTime))
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(if (= key :ctrl+c) (system.set_clipboard (selection-text view textNew))
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(= key :ctrl+v) (set textNew (replace-selection view textNew (system.get_clipboard)))
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(key:find "shift%+") (set f.i (or (textnav (key:gsub "shift%+" "") f.i textNew) f.i))
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(let [iNav (textnav key f.i textNew)]
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(when iNav
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(set f.i iNav)
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(set f.iAnchor iNav))
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(when (or (= key :delete) (= key :backspace))
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(local (iStartDel iLimDel)
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(if (not= f.i f.iAnchor) (selection-span view)
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(= key :delete) (values f.i (+ f.i 1))
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(= key :backspace) (values (math.max 1 (- f.i 1)) f.i)))
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(set textNew (replace-selection view textNew "" iStartDel iLimDel)))))))
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; handle mouse events
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(when (mouse-inside x y w h) (set-cursor view :ibeam))
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(when (and (focused? view tag) (active? view tag) (mouse-inside x y w h))
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(local mouse-i (i-from-x textNew (love.mouse.getX) x style.font))
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(when initial-press
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(set view.imstate.focus.iAnchor mouse-i))
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(set view.imstate.focus.i mouse-i))
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; draw box
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(love.graphics.setLineWidth 1)
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(love.graphics.rectangle :line x y w h)
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(if (focused? view tag)
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; draw text with selection + caret
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(let [(iStart iLim) (selection-span view)
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xSelect (renderer.draw_text font (textNew:sub 1 (- iStart 1)) xText yText color)
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sSelect (textNew:sub iStart (- iLim 1))
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wSelect (font:get_width sSelect)
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xTail (+ xSelect wSelect)]
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(when (> wSelect 0)
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(renderer.draw_rect xSelect yText wSelect hText style.selection)
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(renderer.draw_text font sSelect xSelect yText color))
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(renderer.draw_text font (textNew:sub iLim) xTail yText color)
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(when (or (active? view tag)
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(< (% (- (love.timer.getTime) view.imstate.focus.blink) (* blink_period 2)) blink_period))
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(renderer.draw_rect (x-from-i textNew view.imstate.focus.i xText font) yText style.caret_width hText style.caret)))
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; just draw the text
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(renderer.draw_text font textNew xText yText color))
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(love.graphics.setColor 1 1 1)
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textNew)
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(fn textfield [form label text]
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(let [{: x : y : w : wlabel : wtext : font : color}
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(with-style form :wlabel #(+ ($1.font:get_width label) $1.xpad)
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:wtext (* 150 SCALE)
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:w #(+ $1.wlabel $1.wtext)
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:tag label)
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form-textbox (lume.merge form {:w wtext :x (+ x wlabel)})
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_ (renderer.draw_text font label x y color)
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text (textbox form-textbox text)]
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(set form.h form-textbox.h)
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text))
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(fn option-text [option]
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(match (type option)
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:string option
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:table (or option.label (tostring option))
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_ (tostring option)))
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(fn dropdown [form selection options]
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(let [{: x : y : w :h row-h : font : color : bg : xpad : ypad : view : tag}
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(with-style form :w (* 150 SCALE)
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:h #(+ ($1.font:get_height) $1.ypad)
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:bg style.selection)]
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(var new-selection nil)
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(renderer.draw_rect x y w row-h bg)
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(renderer.draw_text style.font (option-text selection) (+ x xpad) (+ y (/ ypad 2)) color)
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(renderer.draw_text style.icon_font "-" (+ x w (- xpad)) (+ y (/ ypad 2)) color)
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(when (focused? view tag)
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(var row-y (+ y row-h))
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(each [i option (ipairs options)]
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(when (button (lume.merge form {:tag [(make-tag tag) i] :y row-y}))
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(set new-selection option))
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(set row-y (+ row-y row-h)))
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(postpone view (fn []
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(var row-y (+ y row-h))
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(each [i option (ipairs options)]
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(renderer.draw_rect x row-y w row-h bg)
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(renderer.draw_text font (option-text option) (+ x xpad) (+ row-y (/ ypad 2)) color)
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(set row-y (+ row-y row-h))))))
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(focus form)
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(or new-selection selection)))
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(fn labelled-dropdown [form label selection options]
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(let [{: x : y : wlabel : wdropdown : font : color}
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(with-style form :wlabel #(+ ($1.font:get_width label) $1.xpad)
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:wdropdown (* 150 SCALE)
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:w #(+ $1.wlabel $1.wdropdown)
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:tag label)
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form-dropdown (lume.merge form {:x (+ x wlabel) :w wdropdown})
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_ (renderer.draw_text font label x y color)
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selection (dropdown form-dropdown selection options)]
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(set form.h form-dropdown.h)
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selection))
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{: attach-imstate : cmd-predicate : postpone : mouse-inside : activate : active?
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: button : checkbox : textbox : textfield : textbutton : dropdown : labelled-dropdown : label
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: reform : under : right-of : horiz-wrapper : group-wrapper
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: with-style : form-defaults}
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