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slider.opa
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slider.opa
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/*
Copyright © 2011 MLstate
This file is part of OPA.
OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.
OPA is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
more details.
You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* A configurable slider widget.
*
* @category WIDGET
* @author Adrien Jonquet, 2011
*/
import stdlib.widgets.core
/**
* {1 About this module}
*
* This widget aims at letting the user choose a value by moving a thumb
* of a gauge bar.
*
*/
/**
* {1 Types defined in this module}
*/
type WSlider.style = {
thumb : WStyler.styler
thumb_dragged : WStyler.styler
thumb_over : WStyler.styler
gauge : WStyler.styler
}
type WSlider.config = {
style : WSlider.style /** Global CSS style of the widget */
range : (int, int) /** Range of values for the slider */
step : int
init : int
on_change : (int -> void)
on_release : (int -> void)
}
WSlider =
{{
/**
* {1 Configuration}
*/
default_style_config : WSlider.style = {
thumb = WStyler.make_style(default_thumb_css)
thumb_over = WStyler.make_style(default_thumb_over_css)
thumb_dragged = WStyler.make_style(default_thumb_dragged_css)
gauge = WStyler.make_style(default_gauge_css)
}
default_config : WSlider.config = {
style = default_style_config
range = (0, 200)
step = 10
init = 0
on_release = (_ -> void)
on_change = (_ -> void)
}
/**
* {1 High-level interface}
*/
/**
* Display a slider
*
* @param config the widget configuration
* @param id the main ID identifier of the widget
*/
@private @client
onready(id,config)=
onready_aux(id,config,_)
@private @client
onready_aux(id,config,_)=
gauge_id = gen_id(id, "gauge")
Dom.transform([#{gauge_id} <- thumb(id,config)])
@private @client
dummy(_) = void
html(config:WSlider.config, id:string) : xhtml =
thumb_left_id = gen_id(id, "thumb_pos")
gauge_id = gen_id(id, "gauge")
gauge = <div id=#{gauge_id} onready={onready(id,config)} ></div> |> WStyler.set(config.style.gauge, _)
<div id=#{gen_id(id, "")}>
<input id=#{"{thumb_left_id}"} type="hidden" value="0"/>
{gauge}
</div>
/**
* {2 Imperative interface}
*/
@private
round(x: int, step : int) : int =
base = x / step * step
if mod(x,step) > step/2
then base + step
else base
@private @client
range_to_pos(id : string, config : WSlider.config, i : int) : int =
w = Dom.get_width(#{gen_id(id, "gauge")})
max = config.range.f2 - config.range.f1
i = if i < config.range.f1
then 0
else if i > config.range.f2
then max
else i - config.range.f1
i = round(i,config.step)
i = Int.of_float((Int.to_float(w) / Int.to_float(max)) * Int.to_float(i))
i
@private @client
pos_to_range(id : string, config :WSlider.config) : int =
w = Dom.get_width(#{gen_id(id, "gauge")})
max = config.range.f2 - config.range.f1
step = Int.to_float(w) / Int.to_float(max)
pos = get_left_offset(id, config)
w = Int.to_float(w)
max = Int.to_float(max)
pos = Int.to_float(pos)
iii = Int.of_float(max / w * (pos + step))
config.range.f1 + round(iii,config.step)
@private @client
set_left_offset(id:string, _config:WSlider.config,v : int) =
thumb_id=gen_id(id, "thumb")
thumb_left_id = gen_id(id, "thumb_pos")
v = v - (Dom.get_width(#{thumb_id}) / 2)
_ = Dom.set_style_property_unsafe(#{thumb_id}, "left", "{v}px")
do Dom.set_value(#{thumb_left_id},"{v}")
void
@private @client
set_left_offset_trans(id:string, _config:WSlider.config,v : int) =
thumb_id=gen_id(id, "thumb")
thumb_left_id = gen_id(id, "thumb_pos")
v = v - (Dom.get_width(#{thumb_id}) / 2)
do Dom.set_value(#{thumb_left_id},"{v}")
a = Dom.Effect.change_to([{left={px=v}}])
a = Dom.Effect.with_duration({fast},a)
a = Dom.Effect.with_easing({linear}, a)
_ = Dom.transition(#{thumb_id},a)
void
@private @client
get_left_offset(id:string, _config:WSlider.config) : int =
thumb_id=gen_id(id, "thumb")
thumb_left_id = gen_id(id, "thumb_pos")
v = Int.of_string(Dom.get_value(#{thumb_left_id}))
v + (Dom.get_width(#{thumb_id}) / 2)
@private @client
get_gauge_width(id) =
Dom.get_width(#{gen_id(id, "gauge")})
@client
set_value(config:WSlider.config, id:string, v : int) =
pos = range_to_pos(id, config, v)
set_left_offset_trans(id, config, pos)
@client
get_value(config:WSlider.config, id:string) : int =
pos_to_range(id : string, config :WSlider.config)
@private @client
move_thumb(e, config :WSlider.config,id) =
gauge = #{gen_id(id, "gauge")}
curpos = Dom.Dimension.sub(e.mouse_position_on_page,Dom.get_offset(gauge))
max = Dom.get_width(gauge)
x = curpos.x_px
x = if x < 0 then 0
else if x > max then max
else x
old = get_value(config, id)
do set_left_offset(id, config, x)
new = get_value(config, id)
if not(old == new)
then config.on_change(new)
else void
@private @client
thumb(id : string, config :WSlider.config) =
thumb_id = gen_id(id, "thumb")
gauge_id = gen_id(id, "gauge")
_ = Dom.bind(#{gauge_id},{mousedown},(e ->
eh1 = Dom.bind(Dom.select_all(), {mousemove},(e -> move_thumb(e, config, id)))
rec val eh2 = Dom.bind(Dom.select_all(), {mouseup}, (_ ->
do Dom.unbind(Dom.select_all(),eh1)
do Dom.unbind(Dom.select_all(),eh2)
i = get_value(config, id)
do set_value(config,id, i)
do config.on_release(i)
WStyler.set_dom(config.style.thumb, thumb_id)))
move_thumb(e, config, id)))
<div id=#{thumb_id} onmousedown={_ -> WStyler.set_dom(config.style.thumb_dragged,thumb_id)}
onmouseover={_ -> WStyler.set_dom(config.style.thumb_over, thumb_id)}
onmouseout={_ -> WStyler.set_dom(config.style.thumb, thumb_id)}
onready={_ -> set_value(config, id, config.init)}>
</div>
|> WStyler.add(config.style.thumb, _)
/**
* {1 Private functions}
*/
@private gen_id(id:string, suffixe:string) = "{id}_{suffixe}"
@private
default_thumb_css = css {
background:#eeeeee;
height:16px;
width:16px;
border:1px double #ccc;
top:-6px;
position:absolute;
}
@private
default_thumb_over_css = css {
background:#e3e3e3;
height:16px;
width:16px;
border:1px double #ccc;
top:-6px;
position:absolute;
}
@private
default_thumb_dragged_css = css {
background:#d1d1d1;
height:16px;
width:16px;
border:1px double #ccc;
top:-6px;
position:absolute;
}
@private
default_gauge_css = css {
position: relative;
width:200px;
height:6px;
background:#cccccc;
border:1px double #bbb;
}
}}